Alan's Bookmarks

electrical

Schneider Electric New 2012 Digest 176
List prices etc
2011 National Electrical Code Changes
http://www.webcitation.org/6D21ti1h4
Czech Grid Operator Says German Power Flow Overloaded Network - Bloomberg
The Czech power grid in 2011 was repeatedly and “more frequently” overloaded with unscheduled flows of electricity caused by renewable energy from Germany, jeopardizing the security of the network, grid operator CEPS said. The most critical situation occurred in the period between Nov. 25 and Dec. 16 when unscheduled power flows amounted to 3,500 megawatts while the usual value is about 1,000 megawatts, the Czech operator said in a statement today on its website. The near-emergency situation in the network was mainly caused by excessive power output from German wind farms on windy days. The shutdown of German nuclear plants, the rise of installed capacity in photovoltaic power plants in Germany and intensive power trading on spot markets also played a part in the network overloads, CEPS (PCZPBL01) said. CEPS has implemented measures to identify and predict such situations and said the risk of the recurrence of such situations in the future still persists and the transmission networks in the region must be reinforced as quickly as possible, it said. The country may have to install transformers at the borders to protect the grid at a cost of 2 billion koruna ($99 million), CEPS chief Vladimir Tosovsky told reporters at a press conference in Prague today, newswire CTK reported. CEPS already plans to invest 3.5 billion koruna in the network in 2012, the newswire reported.
Grounding and Bonding - Questions and Answers 1
http://www.webcitation.org/6D1mxnVzg // Neutral and Ground Connections At service equipment the NEC permits the grounded (neutral) conductor, the equipment enclosure, and the grounding electrode conductor to all terminate together. Is it permissible to land the equipment grounding conductors on the neutral bus bar with the grounded (neutral) conductors, or am I required to set a ground bar for the equipment grounding conductors? A1: Equipment grounding conductors can terminate on the same terminal bar with the grounded (neutral) conductors, but this is only permitted if the panelboard is rated service equipment and it is used as service equipment in accordance with 230.71(A). However, each grounded (neutral) conductor must terminate within the panelboard in an individual terminal [408.21]. // Grounding Remote Building and Structures NEC 250.32 allows the grounded (neutral) circuit conductor supplying a second building to be bonded to the equipment grounding conductor at the remote building. grounding electrode system of the second building. If the two buildings are electrically connected via a conductive path, such as the shielding of a coax cable or water pipe, this would provide an alternate path for neutral current to flow during normal operation (like resistors in parallel). Is this a trivial concern? Do you know of any problems that can arise from such a situation such as GFI relays in the main service? All those whom I have discussed this with have dismissed it as trivial. They site residential houses connected via a common water line.
Radio World: A/C Color Code Is for Your Own Good
Although the National Electrical Code doesn’t require a specific color code for ungrounded conductors, electricians often use the following color system for power and lighting conductor identification: • 120/240V, single-phase wiring — black, red and white • 120/208V, three-phase wiring — black, red, blue and white • 120/240V, three-phase wiring — black, orange, blue and white • 277/480V, three-phase wiring — brown, orange, yellow and gray; or, brown, purple, yellow and gray On the grounded side for neutrals, the wires have to be white or gray. Buc prefers white at 120/240 (208) and gray for 277/480 circuits. Green or bare wire is always the grounding conductor. Personally, Buc specifies the latter 277/480 color grouping; that removes the “orange” wire color and any confusion. Why? Orange is the only specified ungrounded conductor and marks the “wild leg” of a 120/240 center-tapped neutral delta configuration. For those unfamiliar: In wild leg configuration, the two end phases on the center-tapped winding provide 120 volts to neutral, but on the wild leg you will find nearly 208 volts to the neutral. If you see an orange wire in a panel, alarm bells of caution should go off in your head. You don’t want to wire a 120 VAC outlet across the wild 208 volt phase.
Electrical Contractor: Significant Changes for the NEC 2008 -Part 4
http://www.webcitation.org/6Cz1rWR1V // (removed by 2008 NEC to prevent inappropriate ground connections from happening later on) // 2005 NEC—250.32 Buildings or Structures Supplied by Feeder(s) or Branch Circuit(s). (B) Grounded Systems. For a grounded system at the separate building or structure, the connection to the grounding electrode and grounding or bonding of equipment, structures, or frames required to be grounded or bonded shall comply with either 250.32(B)(1) or (B)(2). (1) Equipment Grounding Conductor. An equipment grounding conductor as described in 250.118 shall be run with the supply conductors and connected to the building or structure disconnecting means and to the grounding electrode(s). The equipment grounding conductor shall be used for grounding or bonding of equipment, structures, or frames required to be grounded or bonded. The equipment grounding conductor shall be sized in accordance with 250.122. Any installed grounded conductor shall not be connected to the equipment grounding conductor or to the grounding electrode(s). (2) Grounded Conductor. Where (1) an equipment grounding conductor is not run with the supply to the building or structure, (2) there are no continuous metallic paths bonded to the grounding system in each building or structure involved, and (3) ground-fault protection of equipment has not been installed on the supply side of the feeder(s), the grounded conductor run with the supply to the building or structure shall be connected to the building or structure disconnecting means and to the grounding electrode(s) and shall be used for grounding and bonding of equipment, structures, or frames required to be gro
2011 National Electrical Code Changes | NEC content from Electrical Construction and Maintenance (EC and M) Magazine
The ampacity of some conductors in Table 310.15(B)(16) (formerly 310.16) didn’t match those found in the Canadian Electrical Code and were therefore changed. While no technical evidence was submitted showing insulation failure of the conductors, this proposal was passed. The end result was a change to the ampacities of: Copper conductors: 14, 12, 3, and 1 AWG, and 600kcmil, 1,500kcmil and 2,000kcmil. Aluminum conductors: 12, 8, and 6 AWG, and 300kcmil, 700kcmil, and 800kcmil.


electricity

Reference Data - electric meters
These diagrams of the basic ANSI standard meter forms show the internal makeup of the most commonly used meters for all AC circuits. Forms 1, 2, 12, 14, 15, 16 are self-contained meters. Forms 3, 4, 5, 6, 8, and 9 are instrument-rated meters. The "S" beside each form number is an indication of a socket rated meter as opposed to an "A" for a bottom connected (A base) meter.
NoOutage Home
NoOutage.com LLC provides information and systems for maintaining electric power supply during periods when utility power is lost. We also offer alternative power systems for both grid-connected and off-grid locations.
2 Phase Power Systems and Two-Phase Electric Solutions
http://www.webcitation.org/64JeR42AL // Two phase power, like three phase, gives constant power transfer to a linear load. But in a three wire system it has a neutral current which is greater than the phase currents. Also motors aren't entirely linear and this means that despite the theory, motors running on three phase tend to run smoother than those on two phase. The generators at Niagara Falls installed in 1895 were the largest generators in the world at the time and were 2 phase machines. True two-phase power distribution is essentially obsolete. Special purpose systems may use a 2 phase system for control. Two-phase power may be obtained from a three-phase system using an arrangement of transformers called a Scott T.
Electrical Installation Guide
Investigation Of Peak Electric Load Impacts of High SEER Residential HVAC Units
The objective of this study was to collect data on and analyze the performance of presently manufactured air conditioners operating at high ambient temperatures. The design parameters that affect power draw under these conditions were investigated. Four modified air conditioner designs capable of reducing peak draw by at least 500 watts were created and tested with a computer simulation. Major air conditioner manufacturers were contacted regarding the proposed modifications. The manufacturers indicated that in principal it was possible to build units that meet the design criteria. By providing a better understanding of air conditioner performance on peak, this study will help PG&E ensure the effectiveness of residential air conditioner peak load reduction programs. This study found that SEER rating is not an accurate predictor of peak kW or kVA.
Frontier Power Products - Recent Projects
Facebook | Fan photos from ELWA Ministries Association USA (EMAUSA)
Pictures of Al Warden, Steve Kejr, Ellsworth Balzer et. al, installing transformers, new generators etc.
Frontier Power Products - Recent Projects
The United Illuminating Company - Customer-Owned Generation Homepage
Underground Overhead Metering School
The UOM School is a non-profit school for electrical linemen and technicians sponsored by the City of Garden City, Kansas Electric Cooperatives, Pioneer Electric Cooperative, and Wheatland Electric Cooperative. This school has been providing quality training for the past 36 years. Instructors from around the country share their expertise during the three-day event. 400 electrical linemen and technicians with varying levels of experience enjoy classes on a wide variety of Underground, Overhead, and Metering subjects. The school also provides more than 40 vendor displays to keep students well informed about the latest changes in technology. Displays range from underground radar equipment to bucket trucks to state of the art metering products. The 37th annual UOM School will be held February 8, 9, and 10, 2011. The $75.00 student fee includes choice of classes for all three days plus an evening banquet (Knights of Columbus - 205 N. 8th Street) with entertainment.
Victron Orion Non-Isolated DC/DC Converters
Victron Orion converters convert 12v DC to 24v DC power and vice versa to solve the common problem of electrical equipment with different voltage requirements than the boat's electrical system. 12-24/7A = $90
River Summers | Stories from the Rappahannock
www.watthourmeters.com - an online reference on US-made watthour meters
Dedicated to the history of the watthour meter in the USA
PowerwoRx - CONSERVE ENERGY, SAVE MONEY, AND PROTECT YOUR ELECTRONICS AND APPLIANCES ... EFFORTLESSLY!
PowerWorx e3 -- power factor correction, harmonic filter, spike protection
OutBack Power / Resources / String Sizing Tool
solar panel string sizing tool - how many in series/parallel based on model, voltage, charge controller, and ambient temp
Mini-EVR
Based on the same technology found in UST's popular Sure-Volt™ power conditioner, the Mini-EVR™ provides the same very fast response, high overload capacity, industrial-grade durability and easy application as its big brother. The Mini-EVR™ is designed for small, single phase loads and is packaged in a smaller, lower cost configuration for indoor or outdoor application. But, most importantly, the Mini-EVR™ offers superior protection from power quality problems without busting your bottom line with high energy costs like traditional power conditioners.
Welcome To West African Power Pool Official Website
Victron Phoenix Inverters
12v input, sinewave 120v output, up to six can be paralleled in single, split, or three phase
The Nuclear Option - WSJ.com
Mr. Becker, the 1992 Nobel economics laureate, is professor of economics at the University of Chicago and senior fellow at the Hoover Institution. Nuclear power has other advantages. Uranium is abundant, easily transported and efficient in producing energy. One kilogram of natural uranium will yield 20,000 times as much energy as a kilogram of coal. Nuclear plants would reduce U.S. dependence on imports of natural gas and oil. To the extent there is concern about running out of fossil fuels -- a concern that I believe is greatly exaggerated -- nuclear generation of electricity becomes even more attractive.
Order or download the book "Energy Unlimited"
Battery/genset power systems
Midwest ISO - Market Information
realtime electricity market pricing for Midwest ISO
Atlas Shrugs: The Case for Nuclear Energy
"Nuclear power has other advantages. Uranium is abundant, easily transported and efficient in producing energy. One kilogram of natural uranium will yield 20,000 times as much energy as a kilogram of coal. Nuclear plants would reduce U.S. dependence on imports of natural gas and oil. To the extent there is concern about running out of fossil fuels -- a concern that I believe is greatly exaggerated -- nuclear generation of electricity becomes even more attractive
MCF51EM Product Summary Page
MCF51EM256 is Freescale’s new smart-meter-on-a-chip 32-bit ColdFire® V1 core microcontroller (MCU) with embedded LCD controller, 16-bit ADC, and metrology-specific peripherals optimized for smart meter application. MCF51EM256 comes with a full suite of hardware and software tools to make development quick and easy.
Why It's The End Of The Line For Wind Power - Forbes
http://www.webcitation.org/6DGvahbT9 /// It’s the end of the world as we know it. That’s what the U.S. wind power industry is saying to itself these days. And they aren’t talking about some Mayan doomsday nonsense. On Jan. 1 the federal production tax credit on wind investments expires. For the past 20 years the credit has offset about 30% of the cost of building wind turbines. Add to that the “renewable portfolio standards” for green energy mandated by 29 states, and as a result we’ve seen wind farms spring up across the country. Since 2007 nearly 40% of all the new electricity capacity built in this country has been wind. Wind now generates roughly 3.5% of U.S. electricity. Don’t expect wind’s share to climb beyond that level any time soon. The end of the tax credit could very well mean the end of the wind industry. According to the federal Energy Information Administration, the “levelized cost” of new wind power (including capital and operating costs) is 8.2 cents per kWh. Advanced clean-coal plants cost about 11 cents per kWh, the same as nuclear. But advanced natural gas-burning plants come in at just 6.3 cents per kWh. But it could be getting a lot worse for wind. A fascinating new report by George Taylor and Tom Tanton at the American Tradition Institute called “The Hidden Costs of Wind Electricity” asserts that the cost of wind power is significantly understated by the EIA’s numbers. In fact, says Taylor, generating electricity from wind costs triple what it does from natural gas.%
openenergymonitor
arduino-based energy monitor
BBC NEWS | Africa | Malawi windmill boy with big fans
The extraordinary true story of a Malawian teenager who transformed his village by building electric windmills out of junk is the subject of a new book, The Boy Who Harnessed the Wind.
Load bank for desiel genterator systems - Electronic Circuits Projects Diagrams Free
Instrument Rated
However, when an inadvertent electrical arc is created with voltages above the threshold of 308 volts, the arc will become self-sustaining.
Salt box load bank questions - Onan Generators
load bank for genset load testing using barrel of salt water
Powerlines - Beckwith Electric Co, Inc. - Services and Products for Electric Power
Interconnection Transformer Winding Arrangement Implications on IPP Protection By Wayne Hartmann, Manager, Application Engineering, Protection and Protection Systems
allAfrica.com: Liberia: LEC Planting Poles to Increase Electricity
According to the LME Minister it is projected that 7,000 customers will be added to the customers list of the LEC when the process is fully implemented and that there will be electricity supply lines running all over the country from Foya to Bushanan, Gbarnga to Zwedru, Fish town to Barclayville and Harper to Sanniquellie. // He said they will expand, restore and rehabilitate sub-stations in Monrovia is what they are doing now. He added that financial and other arrangements have been completed and finalized and they are rebuilding Stockton creek and upgrading it to sub-station level, while constructing a new sub-station at Scheffelein. The minister pointed out that they are building a 66kv high voltage lines in Bushrod island to Paynesville and Scheffelein and once the construction of those sub-stations are completed, it will now be the delivery of electricity to Monrovia. He said after Monrovia, they will embark on the pre-corridor project, which is taking electricity outside Monrovia, adding that it involves moving electricity from ELWA junction to Harbel, Redlight and Kakata for which they have received the financial commitment of donors // Minister Sendolo narrated that their objective is to ensure that every city and town across the country benefit from electricity, noting that the cost of electricity will be reduced to 20 cent. He said in the funding, government is taking the lead as it allotted US$45 million for the rehabilitation of the Mount coffee hydro plant.
The Ufer Ground
http://www.webcitation.org/5u1abZrFW // The term "Ufer" grounding is named after a consultant working for the US Army during World War II. The technique Mr. Ufer came up with was necessary because the site needing grounding had no underground water table and little rainfall. The desert site was a series of bomb storage vaults in the area of Flagstaff, Arizona. The principle of the Ufer ground is simple, it is very effective and inexpensive to install during new construction. The Ufer ground takes advantage of concrete’s properties to good advantage. Concrete absorbs moisture quickly and looses moisture very slowly. The mineral properties of concrete (lime and others) and their inherent pH means concrete has a supply of ions to conduct current. The soil around concrete becomes "doped" by the concrete, as a result, the pH of the soil rises and reduces what would normally be 1000 ohm meter soil conditions (hard to get a good ground). The moisture present, (concrete gives up moisture very slowly), in combination with the "doped" soil, make a good conductor for electrical energy or lightning currents. Ufer techniques are used in building footers, concrete floors, radio and television towers, tower guy wire anchors, light poles, etc. Copper wire does not function well as a "Ufer" ground due to the pH factor of concrete (+7pH is common). The use of steel reinforcement as a "Ufer" ground works well and concrete does not chip or flake as has been found with copper. The use of copper wire tied to the reinforcement rods outside the concrete shows none of these problems.
Picasa Web Albums - Rusty - March 2nd Work
An Opened Recommendation to Government of Liberia - The New Dawn Liberia | Truly Independent
Over the past few months, the Government of Liberia (GOL) has expressed the desired to get the Mount Coffee Hydro up and running. I have read and heard about it requiring over two hundred million United States dollars to achieve. The strategy one uses in designing a system determines its cost. If GOL wants to make good on this huge task of national interest, I recommend a Liberian with many years of experience working to keep a hydro operating right here in Liberia and he is in charge of ensuring that Firestone Liberia meets its power supply. The individual is Patrick Brown. With our government full support, Patrick can restore our hydro. GOL should negotiate with Firestone Liberia and lure him. He has what it takes to do the job. Patrick manages a team of Liberians operating and maintaining Firestone Liberia hydro. This brother worked for LEC for many years at Mount Coffee. He knows the facility well. I believe GOL should use him and give him all the support to address the problems at our hydro. Patrick knows what it takes to keep a hydro functional. I am so convince that he will save us money; not cost been throwing around here. Patrick commanding his team of Liberian engineers and technicians at the Firestone Liberia hydro
The Wye/Wye
http://www.webcitation.org/64KEIAn5I // The following is from a GE transformer connections book copy righted in 1970. Y-Y connected transformers, excepting three-phase core-type units, are not capable of supplying an appreciable single-phase load from line to neutral without a serious shift in the position of the neutral, owing to the fact that the corresponding primary currents of such loads, flowing through the primaries of the unloaded phases, magnetize them. This statement is primarily true for Y-Y connected single-phase units and shell-type three-phase units. Core-type units, however, may, on account of the interlinking of the magnetic fluxes in the three legs, give tolerably good results under conditions of single-phase loads from line to neutral or unbalanced electrostatic charging currents. // The wye-wye- is used under the same condition and to supply the same mixed distribution loads as the delta-wye connection. The division of load between transformers is also similar to t hat of the delta-wye. CARE SHOULD BE EXERCISED IN MAKING THE WYE-WYE CONNECTION TO MAKE SURE THAT A WIRE CONNECTS PRIMARY BANK AND PRIMARY CIRCUIT NEUTRALS. iF NOT, TWO PRIMARY WINDINGS WILL BE IN SERIES BETWEEN EACH TWO PHASE WIRES. Current into a transformer from its phase wire can return only through the other two phase since there is no neutral return. Thus , the wye-wye without connected primary bank and primary source neutrals can operate satisfactorily only when the load is EXACTLY balanced between each phase and neutral on the secondary with equal phase to neutral voltages. Only then will the vector sum of the phase currents add up to zero at the neutral point so that the return current equal zero.
Find Solar Installers Solar contractors: Solar cost estimate. Solar energy solar power analysis. Customer reviews of solar professionals pros. Local directory for solar electric water pool heat contractor. Findsolar
wind, solar calculators/estimators
Engineer's take on restoring electricity in Liberia
http://www.webcitation.org/5n75hpYzP // the Liberian government is asking for US$500 million for the complete rehabilitation of the existing Mount Coffee Hydro Plant and the construction of an upstream storage dam. Wind power, has become one of the fastest growing sources of electricity generation in the United States and the world, it is cheaper and affordable for everyone.
Liberia Electricty Corporation .: Create an energized Liberia :.
LEC official statement of conversion to 50Hz 230/400v as of 1998 with power conversion study funded by Danish Development Agency http://www.webcitation.org/5iyXkYFZT
Davidson College Instrumentation Specialist - NEETS
United States Navy Electricity & Electronics Training Series - The Navy Electricity and Electronics Training Series (NEETS) was developed for use by personnel in many electrical and electronic related Navy ratings. Written by, and with the advice of, senior technicians in these ratings, this series provides beginners with fundamental electrical and electronic concepts through self-study. The presentation of this series is not oriented to any specific rating structure, but is divided into modules containing related information organized into traditional paths of instruction. The series is designed to give small amounts of information that can be easily digested before advancing further into the more complex material. For a student just becoming acquainted with electricity or electronics, it is highly recommended that the modules be studied in their suggested sequence. While there is a listing of NEETS by module title, the following brief descriptions give a quick overview of how the individual modules flow together.
Two Sockets Two Meters
TSTM (Two Sockets – Two Meters, Inc.) is dedicated to improving metering function, installation, cost and safety across the electricity industry. Our initial products were designed to allow metering all poly- and single-phase installations using only two – and sometimes one – 9S meter. However, with this efficiency came increased reliability, safety and ease of installation. These important benefits have eclipsed our initial technical advances.
GE Industrial Publication Library Search
Some thoughts on Lightning Protection
by Jon Shea // http://www.webcitation.org/6Hp5sIY9k
Amazon.com: Health Hazards of Not Going Nuclear (9780441319701): Petr Beckmann: Books
Dr. Beckman's energy book is still the most concise comparison of health hazards across multiple electrical generating technologies of which I am aware. He makes clear that no technique for generating electricity is absolutely safe. Each has its risks. However some are much more dangerous to human safety and health than others. His energy book carefully makes comparisons and shows that our failure to use nuclear as the primary heat source for electrical power generation has sentenced many people to premature death. Nuclear power generation using U.S. technology is not only safer in some aspects, but in all significant aspects. // Since Dr. Beckman's book was published it has been shown that coal plants release enough uranium and thorium in their stack gases and scrubber sludge to power a nuclear power plant larger than the coal powered plant. One of the few significant hazards of nuclear power is the release of radioactivity. Most coal plants release too much radioactivity to operate if they were regulated by the NRC. U.S. background radiation is about 250 millirems per year (some locations in other countries have levels 20 times higher). To this, nuclear power plants add about 0.003 millirems. Living within 50 miles of a nuclear power plant adds about 1/100 as much radiation as 1 old color TV. Grand Central station in NY could not be licensed as a nuclear reactor even without any fuel because its granite blocks emit too much radiation. // In 1973 calculations show that a small change in radiation levels at nuclear plants would cost 800 million per saved life. The NRC mandated the change. A similar calculation showed that
Symons Monthly Meteorological Magazine April 1883 Artificial Aurora Borealis Artificial Aurora borealis Prof S Lemstrom Finland - a set on Flickr
New Life for the Ufer Ground | ASHI Reporter
http://www.webcitation.org/5u1bNhqBK // The 2008 NEC – Section 250.52(A)(3), reads as follows: Electrodes permitted for grounding. Concrete Encased Electrode. An electrode encased by at least 50 mm, (2 inches) of concrete, located horizontally near the bottom or vertically, and within that portion of a concrete foundation or footing that is in direct contact with the earth, consisting of at last 6.0 m (20 ft.) of one or more bare or zinc galvanized or other electrically conductive coated steel reinforcing bars of not less than 13mm (1/2 in) in diameter, or consisting of at least 6.0 m (20ft.) of bare copper conductor not smaller than 4 AWG. Reinforcing bars shall be permitted to be bonded together by the usual steel tie wires or other effective means. Where multiple concrete encased electrodes are present at a building or structure, it shall be permissible to bond only one into the grounding electrode system.
Industrial Automation Grounding, Harmonics & Transient Overvoltage Protection
The Industrial Automation Grounding, Harmonics & Transient Overvoltage Protection course covers key power quality issues that can adversely affect the operation of programmable logic controllers, variable frequency drives and other sensitive electronic equipment integral to process control in all automated manufacturing environments. Through effective single point grounding, control of harmonic currents and proper transient overvoltage protection, attendees will learn to better assure a minimum amount of equipment downtime.
Liberia studies feasibility of reviving sole power plant
http://www.webcitation.org/5jziejifU The Liberian government has contracted US-based engineering company Stanley Consultants to carry out studies on the feasibility of resuscitating the country’s only hydropower plant, which was damaged during the West African country’s bloody civil war. “The US government, through the US Trading Authority, has given more than US$531 000 for the conduct of feasibility studies on our damaged hydro plant, and Stanley Consultants has been awarded the contract to do the studies and [establish] the extent of the damage and the cost of rehabilitating the dam,” Liberia Electricity Corporation (LEC) head Harry Yuan says.
Company to build 35MW biomass plant in Liberia: waste rubberwood feedstock
http://www.webcitation.org/5jzj7IOIL Canada's Buchanan Renewable Energies has pledged to construct a 35MW integrated biomass electricity generation power plant in Paynesville to supply electricity to Monrovia. Power supplies in Liberia's capital are erratic, with the poor country's main electricity facility - a large hydroelectric power plant - still damaged because of the civil war that kept the West African country in its grip for years.
Sierra Club Targets Colorado Springs, Scrubber Technology In War On Coal » Media Trackers
http://www.redstate.com/2013/01/16/sierra-club-targets-colorado-springs-scrubber-technology-in-war-on-coal/ http://www.instituteforenergyresearch.org/levelized-costs-of-new-electricity-generating-technologies/
Standoff Insulator - 1100-A1
Glastic 2165
Linework Forum
Feasibility Study Assessed Liberia Hydroelectric Dam - Stanley Consultants
http://www.webcitation.org/6FSRc1hhk /// During the 1960s, Stanley Consultants was selected by the Liberia Electricity Corporation (LEC) as the design engineer for the new Mount Coffee 64 MW hydropower project on the St. Paul River in Liberia, West Africa. Upon completion, it was named the Walter F. Walker Hydro Dam and contained four vertical hydroelectric generating units, 3 earth-filled dam sections, 10 flood control gates, and a 69 kV substation and transmission line. This facility became the country's largest source of electricity. This facility operated successfully until 1990 when the National Patriotic Front of Liberia took control of the project site during the First Liberian Civil War and did not permit LEC to open the tainter gates during high water events. Eventually, the earth-filled dam was overtopped and destroyed. Since then, the powerhouse has been vandalized, looted and all mechanical and electrical systems have been destroyed, leaving only the concrete substructure, superstructure and steel penstocks. In 2007, Stanley Consultants was again retained by LEC to determine the feasibility of restoring the facility and to research the project's potential environmental and socioeconomic benefits. A damage assessment study and field observations were performed on the dam in the areas of civil, geotechnical, hydro-mechanical, and electrical engineering. After the investigations, a comprehensive report outlined rehabilitation requirements and the engineering work required to restore the plant. In addition%2
2011 NEC Changes
http://www.webcitation.org/5zmR6qXwn - approved grounding practices, etc
Should You connect Transformer Ground to Building Ground?
When two “isolated” grounding systems are horizontally separated by only 10 ft of earth, they are not electrically insulated from each other. This medium-to-high impedance can lead to a possibly harmful potential difference between the grounding systems and the distribution system’s neutral and grounding conductors. In B.T.’s example, there are two grounding connections of the system’s grounded conductor (neutral): one at the transformer and the other at the building’s service disconnect. Each is connected to its respective ground electrode. However, a reduced amount of objectionable current will still flow across the earth gap, separating the two grounding systems. Small voltages thus generated are more than enough to create possible destructive interference on digital control and communications networks and computer-operated devices. Preventing this requires one connection between the power system’s grounded conductor and just one of the grounding systems, with both grounding systems then directly connecting together. This is permitted by Sec. 250-21 of the NEC. —F.M.P.
Ambient Knowledge
energy monitor displaying various shades of red, green, blue in an LED to give feedback on home energy usage.
Projects - Engineering, Environmental,...
http://www.webcitation.org/67bsgLZHk // Stanley Consultants provided conceptual design and feasibility study to redevelop hydroelectric power and construct an upstream storage reservoir. Located on the St. Paul River, Mt. Coffee formerly generated 64 MW of power. Originally designed by Stanley Consultants, and constructed in the 1960s, it was Liberia’s largest source of electricity and vital in their plans for reconstruction and restoring commercial productivity. The project consists of a 3-km-long, earth-filled dam that diverts water to the intake structure. Penstocks then deliver the water to the powerhouse containing four vertical Kaplan units. The water is then returned to the river by a tailrace canal. The earth-filled dam was breached when LEC personnel were not allowed to raise the ten tainter gates that regulate the reservoir’s level. Left unraised during the rainy season, the gates caused water to eventually crest the earth-filled dam, creating a wide breach. As a result, the reservoir was drained and the intake is currently above the water. Water now bypasses the powerhouse, leaving the turbines dry. Subsequent vandalism and looting removed virtually all of the mechanical, electrical, and control systems from the powerhouse. The LEC retained Stanley Consultants to prepare an updated feasibility study for the redevelopment of hydropower at Mt. Coffee via funding from the United States Trade & Development Agency. The study included conceptual designs, cost estimates, energy generation analysis, environmental review, and comprehensive financial and economic analyses. Stanley Consultants has since been retained by the Government
Main Page - GridTrak
Welcome to the GridTrak Wiki! This wiki exists as a collaborative repository for research and development of technology useful for interfacing energy sources, storage, and loads to the Energy Grid.
The Industrial Electricians Notebook Index of A...
free pdf articles
FNET Server Web Display
Operated by the Power Information Technology Laboratory at the University of Tennessee, FNET is a low-cost, quickly deployable GPS-synchronized wide-area frequency measurement network. High dynamic accuracy Frequency Disturbance Recorders (FDRs) are used to measure the frequency, phase angle, and voltage of the power system at ordinay 120 V outlets. The measurement data are continuously transmitted via the Internet to the FNET servers hosted at the University of Tennessee and Virginia Tech. The Power IT Lab has developed several applications which use the FNET data to study the power system, including: Event detection and location Oscillation detection Animations of frequency and angle pertubations Integration of renewables into the power grid Detection of system breakup or islanding Prediction of grid instability and reduction of blackouts Providing grid control input signals
Lessons In Electric Circuits
A free series of textbooks on the subjects of electricity and electronics
Ambient Knowledge
arduino-based energy monitor, using RGB LED to give feedback on energy usage
Power Frequency Monitor Chart
monitor power line frequency & stability at various points worldwide
Guidelines for Interconnecting Generators to The United Illuminating Co. Distribution System
Books | Schneider Electric in partnership with Seymour Hunter
Electrical Installation Guide, based on IEC standards
[Phoronix] A Plethora Of Linux Power Tests Are On The Way
For several weeks, I've been looking for a USB-based power meter or UPS power supply that could monitor the AC power consumption connected to a desktop power supply. Ideally, I've been looking for such a solution that costs less than $100 USD. This mission has now been accomplished with coming across the Watts Up Power Meter Pro, per a reader recommendation. The "Watts up? PRO" has a USB interface, provides an integrated LCD for also monitoring the power consumption and other data that can be toggled via two buttons, and accepts any US power connection. This power meter also supports logging the power data to the device itself and various other options from their software. The company only makes Windows software, but from their support page they reference a community-created open-source utility. For a little more than 1,000 lines of C code is this open-source utility that works under Linux with the "Watts Up" brand power adapters. It supports dumping various power metrics over USB, including the real-time Wattage. The cost of the Watts Up Pro is $130 USD from the manufacturer web-page but can be found for as little as $110 from other Internet web-stores. I decided to buy one of these units after seeing the features, open-source Linux support (albeit spawned by the community), and the acceptable price.
Op-Ed Contributor - Satellites With Solar Panels Can Beam the Sun’s Energy to Earth. - Op-Ed - NYTimes.com
Liberia: Investment Opportunities - Electricity
http://www.webcitation.org/5jzduvivT investment opportunities, Liberia Electricity Corp
Bloom Energy | Be The Solution | Solid Oxide Fuel Cells
For decades, experts have agreed that solid oxide fuel cells (SOFCs) hold the greatest potential of any fuel cell technology. With low cost ceramic materials, and extremely high electrical efficiencies, SOFCs can deliver attractive economics without relying on CHP. But until now, there were significant technical challenges inhibiting the commercialization of this promising new technology. SOFCs operate at extremely high temperature (typically above 800°C). This high temperature gives them extremely high electrical efficiencies, and fuel flexibility, both of which contribute to better economics, but it also creates engineering challenges. Bloom has solved these engineering challenges. With breakthroughs in materials science, and revolutionary new design, Bloom's SOFC technology is a cost effective, all-electric solution.
AWG to mm2
Hydroelectric Power Plants in West Africa
Institute for Energy Research | Levelized Costs of New Electricity Generating Technologies
http://www.webcitation.org/6Hp9UgcKv // charts of levelized costs for energy sources --
eGauge Main Unit
* Measures electric AC power on up to 12 circuits: o Building-demand/consumption o Renewable energy production (e.g., PV solar, wind) o Individual appliances, such as geothermal pumps, AC, fridge * Supports wide range of current transformers (CTs) to accommodate virtually any size load/production-facility * Built-in web server * Fully web-configurable * Built-in solid-state memory retains up to 30 years of data * Internet-enabled but can also operate autonomously without Internet connection * Free life-time firmware upgrades * No service contracts * No maintenance * No batteries to replace * Windows, Mac, Linux, & smart-phone compatible. * For residential, commercial, municipal, and industrial use. * Google PowerMeter-enabled * BACnet compatible * FCC and UL-61010 compliant * Lead-free and RoHS-compliant * Made in USA
Cyclone Power Technologies - Cyclone Engine
rankine cycle heat regenerative external combustion reciprocating steam engine. Can also run off waste heat from other engines.
What's Really Wrong With the Smart Grid - Lisa Margonelli - National - The Atlantic
We really need to define the Smart Grid not in what it might offer interest groups, or why it's a "good idea," but in how it will empower consumers to save energy and money, encourage innovation in technology and markets, and create a stable atmosphere for investment and productive competition. What would that look like? For starters, a consumer-focused grid would make cooperation between utilities and their customers part of the contract.
Cell Networks Are Energy Hogs - Alexis C. Madrigal - The Atlantic
For years, people have talked about the electricity consumption of data centers. Some people want to believe, somehow, that Googling is energy intensive. But it's not. Thanks to Koomey's Corollary to Moore's Law, computation has been getting more energy efficient: The number of computations per kilowatt-hour of electricity usage has been doubling every 1.5 years for decades. Relative to our society's other technological processes -- heating homes or growing corn or ground transportation -- computing's energy usage was and is a drop in the bucket. All of Google, all its servers and campuses and everything, require about 260 megawatts of electricity on a continuous basis, as of 2011. The US has about 1,000 gigawatts of capacity, or 1,000,000 megawatts. So, to put it mildly, I am sanguine about the electrical consumption of our computing infrastructure. But, according to a new report from the University of Melbourne's Centre for Energy Efficient Telecommunications, the wireless networks that let our devices tap into those data centers might turn out to be another story. In a new whitepaper, the CEET estimates that when we use wireless devices to access cloud services, 90 percent of the electrical consumption of that system is eaten up by the network's infrastructure, not the servers or phones.. The data centers themselves use one-tenth that amount of electricity. Worse, cloud services accessed wirelessly will continue to explode, leading to a ballooning electrical load as well. By 2015, they estimate this system could eat up between 32 and 43 million megawatt hours. In 2012, the figure was only 9 million megawatt hours.
ARINC Electrical Connectors
Empower plugs & jacks for in-seat power
NOVA | Inside a Nuclear Control Room
gigapan panorama
Arinc 628 "EmPower" connector
Complete List of Home Energy Monitors & Displays | open4energy
Powerlet :: The 2007 Powerlet Product Catalog
For years BMW has been using the same plug and socket format that the Powerlet product uses. Similiar to the "cigarette lighter" for autos, the Powerlet connector allows you to access the battery without disassembling the bike. This form factor is quickly becoming the industry standard powersport connector.
The Outlook for Nuclear Power in the U.S. - WSJ.com
The next generation of nuclear reactors is on its way, and supporters say they will be safer, cheaper and more efficient than current plants. Here's a look at what's coming -- and when.
FCIC: Surges Happen! How to Protect the Appliances in Your Home
www.nist.gov/public_affairs/practiceguides/surgesfnl.pdf
Electrical Installation Guide - buy today!
Does Grounding Rebar (Ufer) Weaken Concrete?
http://www.webcitation.org/5u1aymnsS // Our structural engineers are always worried about corrosion due to dissimilar metals (when you wire-tie the copper to the rebar) but IEEE Green Book (or Emerald Book?) says that won't happen when you're embedded in concrete. // When I worked for a large consulting firm, our corrosion engineers looked at the corrosion issue from time to time and always concluded that there should little if any galvanic current between copper and reinforced concrete.
Electrical Installation Guide - Techniques, Safety, Calculations, Regulations, Wiring and Standards in Electrical Installations
3 PH to 1 PH TRANSFORMER, 20 KVA, 60 HZ, PN 5617L |
Primary 3ph reverse delta (one winding reversed polarity) > secondary 3 windings in series -- 30kva 3ph input, 20kva single phase output, primary line currents imbalanced
Electrical Installation Guide - Techniques, Safety, Calculations, Regulations, Wiring and Standards in Electrical Installations
12/24 Volt DC/DC 20 Amp DC-DC Converter
Energy Measurement | Analog to Digital Converters | Analog Devices
Analog Devices Energy (ADE) measurement ICs are the most proven and most preferred energy measurement technology in the world. Your metering needs are met with best-in-class performance, reliability, and EMC at an attractive system cost. The Energy Measurement Products 12-Page Catalog features integrated products for LCD Meters, pulsed output products for stepper motor display meters and serial interface products for LCD meters as well as 3-phase measurement and data communications products.
Why a power-factor correction device is better suited to industrial applications
allAfrica.com: Liberia: U.S.$65 Million for Hydro - Liberia Begins Borrowing Again
Finance Minister Amara Konneh Thursday (Jan 24) disclosed in Monrovia that the Government of Liberia and the European Investment Bank have completed the signing of a loan deal worth US$65 million to finance the Mount Coffee Hydro. Liberia is expected to pay back the money in 20 years at the interest rate of 1.4 percent, meaning the country will have to pay about US$73 million. Liberia only three years ago graduated from a mammoth debt burden of at least US$5 billion, an amount the country would never pay back in generations. Konneh said the loan will enable government starts the renovation process of the Mount Coffee Hydro which was destroyed more than 20 years ago as result of the Liberian civil war. The hydro powered the capital and its environs, but was systematically looted during the war years. According to Konneh, a total of US$200 million is needed to complete the renovation work on the Hydro. In the same vein, he said Germany and Norway will give to Liberia in grant the amount of US$35 million and US$75 million respectively as support to rebuild the Hydro, while Liberia will make an annual contribution of US$15 million towards the project. Konneh noted that the Hydro, when rebuilt, will produce about 80 megawatt of electricity, something he said will be bigger than 20 [64] megawatts it produced prior to its destruction. // The Mount Coffee Hydro is expected to be completed in three years. It is also expected by President Ellen Johnson Sirleaf that the hydro will be officially turned on December 20, 2015.
More Books for POWER LINEMEN
Distribution Transformer Manual by GE GET-2485T
GE GET-2485T General Electric Distribution Transformer Manual -- Price: $27 Includes Shipping This simple type of GENERAL ELECTRIC hand book (GE-2485 ) includes commonly used distribution transformer connections and related information including reference tables, voltages, diagrams, etc. and is utlized by many electrical training classes. With the help of this GE2485 book you can manage your transformer and substation assets with the goal of minimizing cost and downtime. Using the GE Distribution Transformer Manual in your on-the-job LINEMAN training classes can help increase reliability, improve profitability and reduce risk with the right knowledge and training.
Lightning protection products and lightning rods from Independent Protection Co.
Independent Protection Co., Inc. is a leading manufacturer and designer in the structural lightning protection field. We provide unparalleled products and services for all types of structures -- including commercial and industrial buildings, homes and historic landmarks. We'll even protect the trees on your favorite golf course!
The Station: Repairworks | English Russia
Russian “Sayano-Shushenskoe” (yep it’s hard to read name) hydro electric power plant images from repair work
allAfrica.com: Liberia: Implications of Exempting the Liberia Electricity Corporation From Customs Duty On Fuel
http://www.webcitation.org/6Gfp9HBXw /// On April 8, 2013, the Government of the Republic of Liberia in the interest of national reconstruction and development, issued 'Executive Order No. 51' granting 100% customs duty waiver on all fuel and lubricants for the use of the Liberia Electricity Corporation (LEC), the Liberia Broadcasting System (LBS), the National Transit Authority (NTA), schools, clinics and hospitals that are deemed by the Ministry of Finance to be inadequately covered by Government's budgetary appropriations or subsidies. // The electricity grid of LEC, which had a total installed capacity of 191 megawatts (MW) of power by 1989, currently generates only 22.6 MW of diesel power, of which about 16 MW are effectively available. Less than 1% of the population has access to public electricity (11000 customers as of August 2012). This should be compared with approximately 13% in 1989 (35000 customers). Given the extremely high cost associated with diesel production particularly due to high imported fuel cost, the generation cost of LEC has been estimated at US $0.32/kWh compared with average generation costs in Africa of US $0.18/kWh (Ref. World Bank, 2011; EU, 2012). Consequently, Liberia has one of the highest public electricity tariffs in the world despite Government's subsidies ($0.52/kWh as of October 2012).
West Mountain Radio - RIGrunner Description
A RIGrunner is the most convenient and safest way to connect all your 12 VDC equipment to a power source. It is a 13.8 VDC power panel that uses the excellent Anderson Powerpole® connectors. Standardize all of your 12 VDC connections using the amateur radio ARES & RACES, RSGB, ARRL Powerpole® system.
allAfrica.com: Liberia: Sealed Deal for Hydro!
The Government of Liberia and the European Investment Bank or EIB Thursday sealed a loan deal worth EURO 50 million (US$65m) as part of a financing arrangement for the Mount Coffee Hydro Power Plant rehabilitation. The loan comes with a high concessional interest rate of 1.42%, amounting to US8m payable over the period of 20 years with 4-years grace period. Government has put the total financing cost of the project to EUR186, 200,000 (US$242 million). Of this amount Government is providing US$47.1 million, while its European partners are contributing EUR150 (US195 million). Norway and Germany have already committed their support comprising the grant component of EUR75 million (US$97.5 Million) and EUR25 million (US$32.5 million) respectively.
HPSTOOLBOX.COM
Buck-boost calculator, other transformer tools.
National Grid - Electric Specifications
Sierra Club Targets Colorado Springs, Scrubber Technology In War On Coal | RedState
According to the U.S. Energy Information Association coal has been consistently cheaper than natural gas. Coal was $1.22 per MMBtu (1 MMBtu = 293 kWh) in 1999 and $2.27 per MMBtu in 2010, whereas natural gas was $2.57 per MMBtu in 1999 and $5.09 per MMBtu in 2010. The Institute for Energy Research has produced a report which projects the levelized cost of energy production using different fuels, including natural gas technologies, coal, and wind in 2017. While the levelized costs for coal and some natural gas technologies are projected to be similar in cost and capacity, wind and off-shore wind provide a fraction of the capacity at a much larger levelized cost. // levelized costs chart
Sun Xtender Solar Batteries - Photovoltaic Battery
Industrial Voltage Regulator Power Conditioner
MiniEVR for 2kva and up
Amazon.com: The Wind Farm Scam (Independent Minds) (9781905299836): John ETHERINGTON: Books
This superb book shows the extreme folly of relying on wind power for reliable electricity supply. In November 2008, the Minister for Energy and Climate Change said that gas-fired and coal-fired electricity cost £50 per megawatt hour (MWh) to generate and nuclear power cost £38. By contrast, offshore wind cost £92, onshore wind £72. To keep the uneconomic option of wind power alive, the government has made us all pay huge hidden subsidies, through our electricity bills, to wind power companies. As the 2003 Energy White Paper admitted, "We have ... introduced a Renewables Obligation for England and Wales in April 2002. This will incentivize generators to supply progressively higher levels of renewable energy over time. The cost is met through higher prices to consumers. ... By 2010, it is estimated that this support and Climate Change Levy exemption will be worth around £1 billion a year to the UK renewables industry." Yet by 2007, Britain's 2,400 wind turbines generated just 1.3 per cent of our electricity, and even this paltry supply was not reliable. The 2008 House of Lords Select Committee on The Economics of Renewable Energy said, "To make up for its intermittency ... back-up conventional plant will be essential to guarantee supply when required, to compensate for wind's very low capacity credit. Wind generation should be viewed largely as additional capacity to that which will need to be provided, in any event, by more reliable means; and the evidence suggests that its full costs, although declining over time, remain significantly higher than those of conventional or nuclear generation." %0
» 60 Hertz Plus or Minus…? WHEAT:BLOG
f a proposal by the National Electric Reliability Corporation (NERC) is approved, the vibrating reed meter may be making a comeback. While utility companies have prided themselves on maintaining accuracy, NERC is proposing a year-long experiment to allow the frequency to drift, and see if any problems result. It says the upside of looser tolerances would be a more reliable grid and reduced operating costs to the utilities. At the heart of the matter is a Time Error Correction (TEC). As the line frequency drifts, the electric companies intentionally create an “error” in the opposite direction. But here’s where it gets complicated. Since most electric power producers are also connected to other electric power producers, they all have to make a TEC at the same time. Thus, everyone agrees to NOT try to achieve the normal goal of sixty cycles per second. Instead, they all generate a little more or a little less than the load demanded by their customers to correct the time error. The NERC estimates that with the proposed changes, fluctuations might be greater on the East Coast, with clocks running up to 20 minutes fast. On the West Coast, they would only gain about 8 minutes.
Moeller - Utilisation categories for contactors and motor starters - norm038.html
AC-1, AC-2, etc
CADWELD® ONE SHOT
Projects | Manitoba Hydro International
http://www.webcitation.org/6GfpnCsp5 /// Five Year Management Contract of Liberia Electricity Corporation The Liberia Electricity Corporation (LEC) on behalf of the Ministry of Lands, Mines and Energy for the Government of the Republic of Liberia (GOL) has selected MHI as the Operator for a five year Management Contract in Monrovia. MHI will engage in a variety of tasks to ensure the efficient operation of LEC. These responsibilities will allow MHI to accomplish the specific deliverables outlined in the five year management contract including: a Business Plan, Electrical Master Plan, Annual Investment Plan and Capital Budget, Annual Operating Budget, Organizational Plan, Human Resource Plan, Training and Development Plan, Utility Service Standards, Maintenance Plan, Quality of Supply Plan, Quality of Service Plan, Customer Database, Safety Plan and Procedures, Annual Reports, Revenue Management Plan, Loss Reduction Plan, and a Financial Model and Tariff Calculation.
Groupe Schneider Technical publication: System earthings worldwide and evolutions
Following an historical review of the origins of Earthing Systems, this "Cahier Technique" goes on to provide information on the practices in some countries concerning medium voltage, HV/LV substations, in particular in LV public, industrial and tertiary distribution. http://tinyurl.com/6z7t39
Schneider Technical Publications: System earthings in LV
This "Cahier Technique" proposes a survey of potential hazards that insulation faults may create for safety of persons and property. It emphasises the influence of system earthings on the availability of electrical power. It presents the three most common system earthings defined in standard IEC 60364 and used to varying degrees in all countries. http://tinyurl.com/5mqkgf
Uglysbooks.com
Blue Sea Systems - DC Circuit Wizard
Schneider Electric Cahiers Techniques
http://tinyurl.com/5ggnwc
Fly RC Magazine - Using Anderson Powerpole Connectors - 1
Selected Tesla Writings -- Table of Contents
The Station Panic | English Russia
Russian “Sayano-Shushenskoe” (yep it’s hard to read name) hydro electric power plant - surveillance cameras
The Electric Power Engineering Handbook, Second Edition (Electrical Engineering Handbook): Leonard L. Grigsby: 9780849392931: Amazon.com: Books
A reference at once so elemental and so comprehensive, The Electric Power Engineering Handbook not only describes the field’s body of knowledge, but defines it. Written by expert contributors under the leadership of one of the world’s most respected and accomplished authorities in power engineering, the second edition remains the undisputed guide to power generation, transmission, and distribution, as well as for modeling, analyzing, planning, designing, monitoring, and controlling power systems. This fully updated edition is now available as a set of five books, each focused on a particular area of expertise. Electric Power Generation, Transmission, and Distribution Electric Power Substations Engineering, Second Edition Electric Power Transformer Engineering, Second Edition Power Systems Power System Stability and Control
Ekstrom Industries' Meter Socket Adapters for the metering departments of electric utilities
MCF51EM polyphase meter reference design Product Summary Page
Guidelines for installing transformers, part 1.
acceptance, testing, inspection,etc. Note - paralleling transformers should be within 7.5% impedance.
Hydro Electic Power Plant Explosion | English Russia
Russian “Sayano-Shushenskoe” (yep it’s hard to read name) hydro electric power plant is the biggest hydro power plant in Russia, and the biggest (in terms of production) electric generating unit in Russia. It’s power output exceeds 6400 Megawatts and is in the Guinness records book. Now, today messages started arriving about a huge explosion on the site. Later, those were confirmed by some official media though according to the witnesses they underestimate the damage. Here we have the fresh shots from the territory surrounded by emergency services. They tell that eleven people died and fifty-six are missing. The signs of panic appeared among locals from the surrounding villages and towns. They fear that in case of further damage the dam could let the water freely go thus meaning that thousand of houses would be flooded.
Electrostatics
fundamentals of electrons / electrostatics
Terrorists Hacking Power Systems
Welcome To Transformer University
With Degrees in: Transformer Basics Transformer Noise K Factor Specifying a Buck Boost
Sayano-Shushenskaya again | English Russia
Russian “Sayano-Shushenskoe” (yep it’s hard to read name) hydro electric power plant is the biggest hydro power plant - more pictures
I-LineMerchandised Panelboards - 600 Vac, 250 Vdc
Dynamic Demand
This meter is monitoring the power balance of the UK electricity grid. If the needle is too far to the left, it means more generation is needed to meet demand. The meter actually shows the grid's "frequency", which is related to the speed of rotation of generators all over the country. When there is too little power available, the whole grid "slows down" and the needle moves to the left. Why is this important? It is important because it is possible to measure this signal from any power outlet in the country. This means that it is possible to design electrical appliances that know the current imbalance on the grid. This is what dynamic demand control is about. The device to measure grid frequency is very simple. Here at Dynamic Demand, we built (at very little cost) a device that continuously monitors the frequency on the electricity grid and updates this website with real-time data. Dynamic demand appliances would react to this very same signal. When the needle is to the left, they would be more likely to switch off, reducing the load on the grid and helping to restore the balance. When the needle is to the right, they would be more likely switch on, using up the excess power. Millions of such devices acting together would act like a huge, fast-reacting back-up system.
Socratic Electronics
stimulating student thought by asking lots of questions, and consolidating new-found knowledge through presentation
All About Circuits
Have questions about electronics, math, physics, embedded systems, programming? Need help with homework? Checkout these and other forums at allaboutcircuits. Ask your question at one of the forums. Curious about questions your peers ask?
DIN Rail Terminal Blocks
Radio World: A/C Color Code Is for Your Own Good
Although the National Electrical Code doesn’t require a specific color code for ungrounded conductors, electricians often use the following color system for power and lighting conductor identification: • 120/240V, single-phase wiring — black, red and white • 120/208V, three-phase wiring — black, red, blue and white • 120/240V, three-phase wiring — black, orange, blue and white • 277/480V, three-phase wiring — brown, orange, yellow and gray; or, brown, purple, yellow and gray On the grounded side for neutrals, the wires have to be white or gray. Buc prefers white at 120/240 (208) and gray for 277/480 circuits. Green or bare wire is always the grounding conductor. Personally, Buc specifies the latter 277/480 color grouping; that removes the “orange” wire color and any confusion. Why? Orange is the only specified ungrounded conductor and marks the “wild leg” of a 120/240 center-tapped neutral delta configuration. For those unfamiliar: In wild leg configuration, the two end phases on the center-tapped winding provide 120 volts to neutral, but on the wild leg you will find nearly 208 volts to the neutral. If you see an orange wire in a panel, alarm bells of caution should go off in your head. You don’t want to wire a 120 VAC outlet across the wild 208 volt phase.
Surge suppression for low voltage signal circuits - US Patent 4903161 Description
Atkinson Electronics Inc
The GSCM is a fully programmable micro-processor generator start controller. It accepts auto or manual commands & monitors multiple start/stop fault conditions // The GSCM-mini is an inexpensive, fixed programmable generator start controller. It supports three types of 2 to 3 wire generator control for 3600 RPM hi speed gen.
Picasa Web Albums - Rusty - Work and Mount Coffee
Moeller - Welcome to www.wiringmanual.com
Online-measurement of the mains frequency
Continental European synchronous grid - live
Schneider Electric Technical Publications - Cahiers Techniques
Liquid Rheostats
calculations and examples of salt-water load-banks
Polk-Burnett - Energy Library
Fundamentals of Electricity, C&I Electrical Systems, Residential Energy Systems...
Standard 12 VDC Power Connector - MERCER COUNTY ARES/RACES
http://www.webcitation.org/5s5OM3Egc // Mercer County ARES/RACES prescribes the 30 Amp Anderson Powerpole as the standard dc power connector for use in EOC’s, and recommends its use by individual ARES/RACES personnel as well. Using this standard, highly reliable connector allows quick and easy installation and substitution of radios, power supplies, batteries, and other equipment. Housings should be mated according to the diagram above, viewing from the contact side (opposite the wire side), tongue down, hood up, RED on the LEFT, BLACK on the RIGHT. You may use a 3/32-inch-diameter roll pin, 1/4 inch long, to keep the housings from sliding apart. www.andersonpower.com Anderson 1330 series Powerpole connector part numbers: Red polycarbonate Housing (1 needed) 1327 Black polycarbonate Housing (1 needed) 1327G6 30 Amp Contacts (2 needed) 1331
TransfPol.pdf (application/pdf Object)
transformer polarity
Panelboards - Table of Contents
CIRCUIT BREAKERS MAIN BREAKERS
Guidelines for transformer application designs.
"The best article explaining transformer design I have ever come across. Very comprehensive and practical without the need for excessive use of formulas. The knowedge shown in this artical can only come from years of experience. "
Southland Electrical Supply
recommended by Winston Ezzell
Powerlines - Beckwith Electric Co, Inc. - Services and Products for Electric Power
discussion of transformer connections when interconnected with the utility.
A tour of Big Valley Power L.L.C.
GE Distribution Transformer Manual
<b>GE</b> Distribution Transformer Manual GET-2485 Barringer & Associates Ltd. is the distributing agency for <b>General Electric’s</b> GET-2485T <b>GE</b> Distribution Transformer Manual for linemen. The pocket reference contains 110 pages in a 4 1/4" X 8" wire-bound format. The price of $17.50 per copy includes UPS ground shipping. Manual topics include: Ratings and Applications; Connection Diagrams; Loading of Transformers; Protection of Transformers; Useful Reference Tables. GET-2485T may be ordered in any quantity. Orders for fewer than 25 copies must be prepaid with a check made payable to <b>General Electric</b>. Orders for 25 copies or more will be billed by <b>General Electric</b>, if accompanied by a purchase order or ordered on company letterhead. Barringer & Associates also has a limited number of <b>General Electric’s</b> GET-2J Transformer Connections, a 134-page manual in a 6" X 9" paperback format. The publication price of $22 per copy includes UPS ground shipping. Manual topics include: Polarity, Phase Rotation and Voltage Diagrams; Transformer Connections; Transformer Taps; Autotransformer Connections; Voltage Stress in Autotransformers in Y-Connection. You may mail your orders to us at: Barringer & Associates Ltd. P.O. Box 1574 Hickory, NC 28603 Or they may be faxed to 828.327.8440.
Electric power engineering - Wye Wye vs Delta Wye Transformers
paralleled generators to distribution system - wye vs delta step-up
Prime Energy Systems
Jon_Risch's DIY AC Balanced Power
http://www.webcitation.org/5g3hu6uEv
Black Brook Dam Apple River Little Falls, Wisconsin
http://www.webcitation.org/5kejORl4e
Welcome to B-Square Ranch
B SQUARE RANCH 3901 Bloomfield Hwy. Farmington, NM 87401 The Bolack Electromechanical Museum is located on the B-Square Ranch south of the San Juan River. Access is along a 60 acre man-made lake, across an 1899 Railroad Bridge, which was moved some 12 miles, and up to picturesque sandstone bluffs. Tommy Bolack has been collecting artifacts representing electric power, broadcasting, medical, agriculture and oil and gas for over thirty years. Opened to the public in 1990, the 15,000 square foot exhibit area and two acres outside, display many aspects of industrial development. The largest standing display of slate and marble switchboard from nine power plants flank the north wall and represent the period from 1990 to 1920. The craftsmanship and ornate nature of electric meters, relays and generators have stood the test of time. Glass insulators now stand as objects of beauty along with massive generator engines. Many items are displayed so that "inside views" maybe had. The now one-of-a-kind RCA 50E spread radio station KOB's 50,000 watt A.M. voice throughout the southwest fro over fifty years, Other early radio and television equipment are assembled for display in the southern section of the museum.
Austin International - Your Global Source For Utility Products & Services
electric meters, street lights, etc
Wire Gauge calculations
AWG/mm2/circular mil calculator

electronics

Milestones:List of IEEE Milestones - GHN
Badcaps.net - Badcaps Home
Badcaps.net was established in late 2002 to counter the bad electrolytic capacitor issue that has been plaguing computer hardware since around the turn of the century. More than likely, if you're even reading this, you know what this site is about... Incase you don't, just keep reading... The bad capacitor issue really began to blossom into the mainstream as a 'real world' problem around 1999, and continues on to the present day. It now being 2009, I am STILL seeing later model boards with this problem. // Badcaps.net is now in the process of carrying a full line of soldering equipment and tools as well as caps and repair services. Our goal is to make Badcaps.net your one stop shop when it comes to repairing your own board.
Free Printed Circuit Board Layout Software, PCB Artist Software.
Designing a Better PCB -- SparkFun Electronics
We are constantly pushing ourselves for better printed circuit boards (PCB). One thing we've learned is that PCB fab houses (such as Advanced Circuits, BatchPCB, PCB123, Gold Phoenix, Bare Bones PCB, anyone really) have a very hard job to do. Creating a PCB is not an easy task and there are many ways for a fab house to mess it up. Unfortunately, fab houses tend to spend less time on prototypes than on production runs. Therefore, we try to design products and PCBs for 'manufacturability'. This tutorial will show you how to minimize the number of ways the fab house can screw up a PCB. We've messed up piles of PCBs over the years. We want to share with you some of the DFM (design for manufacture) rules and tricks and tips we've learned to get a good PCB, every time. If you're creating a prototype PCB, we highly recommend you use these rules to increase the chances that your proto will work!
Arduino (A Different Lemming)
Alan's Sales
Alan's Sales Specializing in overstock FUSES for Electrical, Electronic, Industrial, Commercial, Residential New, New Old Stock, and Used: FUSES - Hardware - Tools Bussmann - Gould, Ferraz Shawmut (now Mersen) - Littelfuse - Edison Overcurrent circuit protection products.
HC908 VFO - loop antenna design
Pad2Pad - Custom Printed Circuit Board Manufacturer
Rules and guidlines for drawing good schematics - Electrical Engineering - Stack Exchange
MCF51EM Product Summary Page
MCF51EM256 is Freescale’s new smart-meter-on-a-chip 32-bit ColdFire® V1 core microcontroller (MCU) with embedded LCD controller, 16-bit ADC, and metrology-specific peripherals optimized for smart meter application. MCF51EM256 comes with a full suite of hardware and software tools to make development quick and easy.
mightyOhm » Blog Archive » Harrison’s Box
A little over a year ago, I became an Uncle. This is my nephew, Harrison, doing what he does best – being cute. Harrison For his first birthday, Harrison’s Mom wanted to give him something really special. Not just an ordinary toy for a one year old, but something strange and wonderful, tactile, interactive, unique. Thus was born the idea of an “electric box”, an electronic contraption full of switches, lights, buttons, knobs, levers, and sounds. An elite task force was assembled to create this special gift, codenamed “Harrison’s Box”. The team consisted of Grandpa, the Woodworker, Jeff (alias mightyohm) the Engineer, and Kylie, the Project Manager. Upon defining the project, we immediately jumped into phase one, Procrastination. Deliverables were met, and as the birthday loomed closer, we eased into phase two, Git ‘er’ Done. Supplies and materials were ordered, wood chips started flying, and soldering irons blazed. A short time later, the front panel was realized:
SparkFun Electronics - Logomatic v2 Serial SD Datalogger
use with EM-406 GPS receiver for GPS logger
Luminary Micro - Stellaris® — the industry's fi...
32-bit microcontrollers (from $3)
PC USB Oscilloscope / Logic Analyzer for $129.50 (UART, SPI, I2C, 1-Wire)
USD $130 -- PC USB Oscilloscope DiSco is a great tool for your hobby projects! In the same box you get Oscilloscope, Logic analyzer, Spectrum analyzer, Recorder and Logic generator with a lot of potential, at an affordable price! Simply connect the device to the computer USB port, run the Windows application and you can analyze the UART, SPI, I2C and 1-Wire interface signals.
PowerStream - batteries, chargers, power supplies, DC converters
LearningMeasure.com - Training for technicians, engineers, and scientists with emphasis on measurement, test, and metrology
LearningMeasure.com provides training and consulting services to businesses and individuals in several technical areas through our network of consultants. Our emphasis is on metrology, measurement and test, but other technical areas are included in the available training.
Davidson College Instrumentation Specialist - NEETS
United States Navy Electricity & Electronics Training Series - The Navy Electricity and Electronics Training Series (NEETS) was developed for use by personnel in many electrical and electronic related Navy ratings. Written by, and with the advice of, senior technicians in these ratings, this series provides beginners with fundamental electrical and electronic concepts through self-study. The presentation of this series is not oriented to any specific rating structure, but is divided into modules containing related information organized into traditional paths of instruction. The series is designed to give small amounts of information that can be easily digested before advancing further into the more complex material. For a student just becoming acquainted with electricity or electronics, it is highly recommended that the modules be studied in their suggested sequence. While there is a listing of NEETS by module title, the following brief descriptions give a quick overview of how the individual modules flow together.
Openembedded
Welcome to OpenEmbedded, the build framework for embedded Linux. OpenEmbedded offers a best-in-class cross-compile environment. It allows developers to create a complete Linux Distribution for embedded systems. Some of the OpenEmbedded advantages include: * support for many hardware architectures * multiple releases for those architectures * tools for speeding up the process of recreating the base after changes have been made * easy to customize * runs on any Linux distribution * cross-compiles 1000's of packages including GTK+, Qt, the X Windows system, Mono, Java, and about anything else you might ever need
Open Circuits
Descriptions, instructions, board layouts, and other documentation for electronics * projects and * ideas. Open Circuits is a wiki for sharing open source electronics knowledge, schematics, board layouts, ports and parts libraries.
ExpressPCB - Tips for Designing PCBs
USBtinyISP - Inexpensive USB AVR Programmer
SparkFun Electronics - Surface Mount Soldering Tutorials - Skillet
VGA Dongles for Mac Mini Headless Booting « Keith’s Electronics Blog
with OBSD, they don’t like to boot without a monitor connected. A few weeks ago I made a batch of VGA “dongles” to trick the Minis into thinking a monitor was present. // — put a resistor in the range of 75Ω across the analog green signal pins (analog green signal to coax shield / ground). Some computers apparently want all the analog lines terminated and some even the sync lines, but the Mini is happy with just green.
Rochester Electronics - Home
Rochester Electronics, headquartered in Newburyport, Massachusetts with a campus of corporate, manufacturing and distribution facilities, is licensed and authorized by over 50 semiconductor manufacturers to provide a continuing manufacturing source for mature/discontinued products. Manufacturers that have authorized Rochester include AMD, Analog Devices, Fairchild, Freescale, Intel, Intersil, National, Texas Instruments, and many others. Rochester manufactures thousands of devices in a variety of package styles from commercial through space manufacturing flows. For industries with long life cycles, Rochester provides a continuing manufacturing supply of critical devices. Inventory includes the world's largest supply of silicon wafers, over 10 billion die and finished devices, over 5 billion. Rochester's design and technology office, located in Rockville, Maryland, provides complete silicon re-creation.
Build It. Share It. Profit. Can Open Source Hardware Work? « TheSurfersZone Random Access
http://www.webcitation.org/5lo0fnHBr
Moeller - Circuit symbols, European – North America - Circuit symbols to DIN EN, NEMA ICS/ANSI/IEEE/CSA
Scotts Electronics Buy Crystal Radio Kits Sets Parts Supply Sale
For Sale Crystal Radio Kits, Crystal Radio Set Supplies, Amateur Ham Radio Parts We are not just selling items for Crystal Radios We sell many Hard to Find Electronic Parts for the electronic experimenter.
BatchPCB - What is this place?
prototype PC board fabrication, as little as 1 board, minimum 1x1" @ $2.50/sq in + $10 setup (15-20 days) [Spark Fun Electronics]
SparkFun Electronics - Surface Mount Soldering Tutorials
FindChips.com Search
FindChips.com aims to perform the fastest, most complete distributor search available today on the internet. After you enter a part number (or substring), FindChips.com will simultaneously query over 20 distributors, and return the responses to you in real time, in the order completed. FindChips.com searches distributor inventory for all types of electronics, including passives, connectors, optoelectronics, and more -- not just chips.
Basic Electronics Concepts :: Electronics and Radio Today
the basic electrical, electronics and radio concepts that are the basis for today's technology.
Brilldea LED Painter
HPRFhelp version 2.12
Welcome to HPRFhelp, Agilent Technologies' RF and Microwave Semiconductor Knowledge Base and Smart Selection Guide!
Copycat PID-Controlled Solder Hotplate « Keith’s Electronics Blog
hotplate for soldering SMD PCBs PID stands for proportional-integral-derivative
Brilldea
DRM Down-Converter For 455kHz IF Receivers Circuit Diagram
http://www.webcitation.org/63lfoymbO using a stable purpose-built 470kHz ceramic resonator as the oscillator, rather than the original unstable L/C version. The 455kHz IF signal from a shortwave receiver is fed into the input (pin 1) of a double-balanced mixer and oscillator (IC1) via a level adjustment pot (VR1). The NE506’s output (pin 4) is then AC-coupled to a PC’s sound card input for processing. With the capacitor between pins 5 & 7 set to 150pF, the oscillator frequency should be around 467.5kHz. You can check if the oscillator is working by putting it near a receiver tuned to 467kHz. You should hear a beat frequency. Circuit diagram:DRM down-converter for 455kHz IF receivers DRM DownConverter Circuit Diagram For 455kHz IF Receivers The IF signal of 455kHz is mixed with 467kHz, giving an output with a centre frequency of 12kHz. Sound cards should have no trouble sampling the 10kHz-wide DRM signal.
limor
Lessons In Electric Circuits
A free series of textbooks on the subjects of electricity and electronics
Arduino Quadrature Encoder Library « Keith’s Electronics Blog
Arduino Quadrature Encoder Library An Arduino library for reading multiple quadrature encoders.
Parts-Express.com - Speakers, Speaker Building, Home Audio and Video, Pro Audio, Electronic Parts & Accessories
SparkFun Electronics - GPS module reviews
Audio and Video, Computer Parts, Batteries, Cable and Wiring at MCM Electronics
SparkFun Electronics - Production & Testing
test jigs for electronics boards using pogopins
PC Based 40MHz USB Digital Storage Oscilloscope w/2 Probes
Turn your Windows based computer into a powerful 40 Mhz 2 channel digital oscilloscope. Using the PC's USB port for data communications between the included hardware & software to create the oscilloscope display on the PC's monitor allowing you to preform functions the same as on a standard oscilloscope. The unit ships with 2 probes, software CD, users manual and USB cable. $170
ExpressPCB - Free PCB layout software - Low cost circuit boards - Top quality PCB manufacturing
Our electronics design software includes two applications, one for drawing schematics, the other for PCB layout. ExpressSCH ExpressPCB Both programs are completely free, fully functional and easily installed with a single InstallShield setup program. They run under Microsoft Windows NT, 2000, XP, Vista and Windows 7. Learning to use our software is fast because of its standardized Windows user interface. After spending the few minutes to learn one, the other takes almost no time because it works the same way.
www.Visual6502.org
6502 processor browser simulator/emulator
Home (The Mechatronics Guy)
mightyOhm » AVR HV Rescue Shield
The AVR HV Rescue Shield is a high voltage parallel mode fuse programmer for Atmel AVR microcontrollers. It currently supports the ATmega48/88/168/328 series and the ATtiny2313. The Rescue Shield is based on my Arduino-based AVR High Voltage Programmer, but with several new features and improvements.
Voltage Multipliers
AppCAD
AppCAD is an easy-to-use program that provides you with a unique suite of RF design tools and computerized Application Notes to make your wireless design job faster and easier. AppCAD's unique, interactive approach makes engineering calculations quick and easy for many RF, microwave, and wireless applications. AppCAD is useful for the design and analysis of many circuits, signals, and systems using products from discrete transistors and diodes to Silicon and GaAs integrated circuits. The keyword for AppCAD is easy - no circuit files, no manuals - just quick and easy.
Cable looms using cable ties and lacing cord :: Electronics and Radio Today
how to use lacing cord or cable ties (tie-wraps) to keep cable forms tidy and in place.
RepRap Research Foundation
makerbot - The RepRap Research Foundation has a single purpose: To promote research in self-replicating manufacturing systems and to distribute the results of that research freely to everybody using open-source licensing.
User:WillWare/Homebrew surface-mount construction - Wikipedia, the free encyclopedia
SchemeIt | Free Online Schematic and Diagramming Tool | DigiKey | Scheme-It
Scheme-it is an online schematic and diagramming tool that allows anyone to design and share electronic circuit diagrams. The tool includes a comprehensive electronic symbol library and an integrated Digi-Key component catalog that allows for a wide range of circuit designs. Additionally, a built-in bill of materials manager is provided to keep track of parts used in a design. Once a schematic drawing is complete, users can export it to an image file or share it via email with others. Scheme-it works natively in all major web browsers without requiring the use of any plugins. Only users registered at www.digikey.com are able to share and save designs.
Schematic Symbols, Electronic Symbols, Circuit Symbols
Matronics Email Lists :: View topic - Cigarette Lighter Alternatives -> EmPower ARINC 628, PowerLe
ARINC 628 Circular Connector - "empower"
Airline seat power plug "empower" spec
Sockets - SMD Adapters
convert SMD chips to standard thru-hole/DIP/DIL parts
How-To: Go green with lead free solder - Hack a Day
FindChips.com Online Electronic Component Distributor Inventory Search
FindChips Electronic Components Search Engine Welcome to the original and fastest electronic part finder and chip search engine. FindChips electronic components search engine scours the leading distributors to give you instant inventory levels and pricing around the world. parts stock
Energy Measurement | Analog to Digital Converters | Analog Devices
Analog Devices Energy (ADE) measurement ICs are the most proven and most preferred energy measurement technology in the world. Your metering needs are met with best-in-class performance, reliability, and EMC at an attractive system cost. The Energy Measurement Products 12-Page Catalog features integrated products for LCD Meters, pulsed output products for stepper motor display meters and serial interface products for LCD meters as well as 3-phase measurement and data communications products.
ElectronicPartsInventory
free online inventory, BOM etc
Britney Spears' guide to Semiconductor Physics ...
Calculators - Maxim
ExpressPCB - Resources for Engineers
AppCAD (free RF design tool from Agilent), OnlineMetals.com, McMaster-Carr, AltaVia (high-end PCB design), Envision Plastics (custom plastic enclosures) GetThePatent.com, PIC-SERVO motion control board, etc
Pass DIY: Articles/Projects
Reconing an Eminence JAY7010 Subwoofer Driver « Keith's Electronics Blog
TECHtionary :: World's First and Largest Animated Magazine on TECHnology
Optocoupler simplifies power-line monitoring - 2002-01-10 08:00:00 | EDN
We did it for the nerds! The blinky blinky nerds!
LED battery level indicator - Hack a Day
PCB Manufacturer, Advanced Circuits Printed Circuit Boards Production, Annular Ring Boards, Circuit Board Fabrication, PCB's Fabricator and Distributor
recommended by Spark Fun Electronics for fast-turnaround PCB orders
SYMLINK.DK - The Bob-clock
The Bob-clock is a wall-clock which uses 60 multi-colored LEDs arranged in a circle to represent the small and big arm of an analog clock. If desired, it can also display the seconds with a third color. The image above shows the Bob-clock (v2.0 hardware, but v2.1 looks the same).
Analog Devices: Rarely Asked Questions...
The column, "Rarely Asked Questions: Strange but true stories from the call logs of Analog Devices," is published monthly in EDN and Design News. Technological troubleshooting, insight and ideas from the experts at Analog Devices to help solve your real-world application challenges.
Stereophile: San Francisco Airport Audio Museum
Shortwave Hum
power supply bypass caps, filtering, etc
Arduino Open-Source Electronics - AboutUs Ranked Websites
Embedded Developer -- Find, Compare, Buy
Moeller - Marking of electrical equipment for North America - Device or Function Code Letters to NEMA ICS 19-2002
ChipDocs - Datasheets for Electronic Components and Semiconductors
Adafruit Industries, Unique & fun DIY electronics and kits
Schematics Depot (tm) - LM3914 based battery monitor
12v power -- 1x LM3914, 1x 1k resistor, 1x 100k pot, 10x leds
Radio World: Create an Old-Timey Radio Feel
If you service RF amplifier modules as used in most of today’s solid-state AM and FM transmitters, you will come to know that sometimes a MOSFET doesn’t blow up when it fails. Over time, Frank began to recognize that the “gate” junction of a MOSFET could become “leaky” — still working but with degraded performance. However, a “leaky” gate can be tricky to diagnose. Some repairs are akin to “throwing the baby out with the bathwater” in that some individuals will simply replace all of the MOSFETs. Good (and expensive) MOSFETs end up being thrown away. Frank doesn’t like using this “shotgun approach” when doing repairs, given the cost of several hundred dollars each. It’s also a personal thing for him to not waste. Frank’s simple project will give you a method to verify the “usable” performance of the RF MOSFET in question. Fig. 4: Brads and buss wire serve as solder points for the components. You likely have all of the parts somewhere in your shop. If you don’t, a visit to your parts store will produce everything you’ll need for around $10 or so. Construction can be simple. Frank used a small block of plywood and some 1-1/2-inch brass brads as the solder points, as shown in Fig. 2. The resistor values are on the schematic in Fig. 3.
CircuitDB | LED 12 Volt Lead Acid Battery Meter
1x LM339, 4x LED, 10x various resistors, 1x zener
Lumisense - eiqhtcubed
eightCubed - an assembly of 512 full color light emitting diodes. Each voxel is addressable by multiplexing the lattice, making sophisticated animations an enjoyable scene on the 8x8x8 LED display. The cube's main function is to be visually pleasing. The eightCubed does this by showing geometric shapes in the form of animations; each animation has 60 frames per second. The animation videos in v1.0 are streamed to the controller via USB by use of a PC application.
Capacitor Lab - Replacing Motherboard Capacitors Howto
Digikey Enhancements - Conscious Anima
greasemonkey scripts for enhancing DigiKey web pages (sort by price)
Battery Monitor for 12V - dot/bar
Simple Battery Monitor
red, grn, ylw - low, ok, hi
Make: Online : Now that's a lotta perfboard …
Wandering the halls of Wikipedia, I came across this jaw-droppingly complex example of a perfboarding project (stripboard, to be precise). The unit was built as a prototype Dolby SR noise reduction circuit and was photographed by Mr. Gregory Maxwell at the San Francisco Airport Museum's History of Audio exhibition. A few pics from the 2006 exhibit can be found over at Stereophile.
MCF51EM polyphase meter reference design Product Summary Page
Electrostatics
fundamentals of electrons / electrostatics
Technical Library
interesting electronics experiments
Printed Circuit Boards & Schematic Drawing Software
Karen's Corner
mechanically scanned led orrery using flashing LEDs for planets and a PIC 16F627
Socratic Electronics
stimulating student thought by asking lots of questions, and consolidating new-found knowledge through presentation
Madhacker.org - Homemade USB ,HID compatible, input device
Objective: -I needed an input device that could provide some additional buttons for my Carputer. -I needed an volume & menu control knob, using common keys did not give me the linear, fast control I needed. -(on-screen volume slider on touch sensitive display was not good enough, because it consumed display space.) -I wanted a circuit that could notify my computer about low battery voltage, and hibernate it in time. -I wanted a circuit that could detect when stopped the engine, so the computer could offer to hibernate automaticly. -I hoped to avoid the need of own USB driver, so it had to be HID compliant device.
All About Circuits
Have questions about electronics, math, physics, embedded systems, programming? Need help with homework? Checkout these and other forums at allaboutcircuits. Ask your question at one of the forums. Curious about questions your peers ask?
Kissling Electrotec - Relays and Switches
German / Swiss relays & switches
Badcaps Forums - Busted Cap on my Video card help please!
Sacon FZ series capacitors are junk. Replace with Panasonic FM series (DigiKey).
SparkFun Electronics - LED Cube 3x3x3
Electronics 101 - Fundamentals of Electricity -...
Good course material
On MicroSD Problems « bunnie's blog
Presensitized Plate (Steel, Brass)
Now you can make your own low cost thin metal parts using this pre-sensitized plate, including encoder, surface mount device solder paste stencil or radio frequency shielding screen. Made with high quality thin steel or brass plate, laminated both sides with high resolution photosensitive film. Use Sodium Carbonate/Washing Soda for developing, use Ferric Chloride solution for etching.
Open-USB-IO Interface Board « Interesting Bytes : Hardware, Software, and Consulting
Open-USB-IO makes it very easy and very cheap to control hardware from your computer. You can also program the ATMEGA32 microprocessor to do anything you want. The Open-USB-IO board will plug into the USB port on a Linux, Mac or Windows computer ( Vista or XP) and provide a variety of digital and analogue inputs and outputs including 7 motor drivers, RS-232, an LDR, Pulse Width Modulators, and more. No special software drivers are required just a simple command line or GUI program. The board is ideal for controlling real hardware from a USB port and for programming at the level of command line or script, C++ on the PC, or C and assembler on the ATMEGA32 microprocessor that is the heart of the board. See www.pjradcliffe.wordpress.com for more details, an excellent reference manual, required programs and more.
Circuit Design on Your Linux Box Using gEDA
Making PCBs « Retromaster’s Electronics Projects
I’ve been making double-sided printed circuit boards in my home workshop for quite some time now. This page is an attempt to document the processes I usually follow and experiences I’ve obtained making PCBs. The common methods of making PCBs at home (e.g. using toner transfer) have been quite well documented throughout the net. My intention here is not to provide a tutorial covering the basics. Instead, I briefly cover my own setup and processes from start to finish and share some of my own experiences as well as elaborate on some usually overlooked topics such as vias and soldermasks.
Open-USB-IO « Pj Radcliffe
Open-USB-IO makes it very easy and very cheap to control hardware from your computer. You can also program the ATMEGA32 microprocessor to do anything you want. The ATMEGA32 code can use the USB interface to the PC and you can debug the code with a powerful built-in symbolic debugger. The Open-USB-IO board will plug into the USB port on a Linux, Mac or Windows computer ( XP, Vista or Windows 7) and provide a variety of digital and analogue inputs and outputs including 7 motor drivers. No special software drivers are required just a simple command line or GUI program. You can control the hardware from command line, script, or your own programs on the PC. You can also program in assembler or C the ATMEGA32 microprocessor that is the heart of the board.
Basics - A Haven for Spare Parts Lives On in Silicon Valley - NYTimes.com
MOST retailers would recoil in horror at the thought of keeping unsold products on their shelves for 30 years. Not Halted Specialties Company. It’s willing to hold on to a few thousand vacuum tubes just in case the right buyer happens to wander into the store, be it this decade or the next.
Capacitor Lab - Types of Capacitors - Polymer Capacitors
Switching Power Supply - Mean Well Switching Power Supply Manufacturer
DC power, converters
High Power DC/DC Converter, 12v to 5v converter, 48v to 12v converter, 12v to 24v converter, 36v to 12v converter
Jon_Risch's DIY AC Balanced Power
http://www.webcitation.org/5g3hu6uEv
obddiag.net
ELM327 compatible USB adapters for On Board Diagnostic (OBD2) monitoring.
AA5TB - Small Loop Antennas
http://www.webcitation.org/5sH3zMbWs
Performance Measurements of Some NiMH Battery C...
http://www.webcitation.org/5VajEYuLE
Free Online Calculators for Engineers - Electrical, Mechanical, Electronics, Chemical,Construction, Optical, Medical, Physics, etc...
Jon_Risch's AC Power Line Filter & Surge Suppresor Information
http://www.webcitation.org/5g3hqy6dk
OBDII Project Home
Our goal for this project was to build an OBD-II compliant device that would communicate with any OBD-II enabled car and read back real time data as well as perform basic performance testing and diagnostics.

elwa

MyPhotoAlbum :: Trip to Africa 2008
MyPhotoAlbum :: ELWA
Liberian Daily Watch
http://www.webcitation.org/6AbsnxtS1 /// In a major press conference over the weekend, Liberia’s Solicitor General Counselor Watkins Wright said government engaged the ELWA management sometimes ago to purchase 14.5 acres of the one hundred and thirty five acres of land to build thirteen ministries. He said the Liberian government told the ELWA management that the 14.5 acres will be purchased at the prevailing rate, but the ELWA management failed to accept the offer. The Liberia Solicitor General noted that as a “responsible and civilized government” it decided to go to Court,to peacefully and lawfully resolve the issue, but according to him, ELWA remains adamant, intransigent and un-cooperative, but based on interventions and appeals from institutions and individuals, the Liberian government decided to withdraw the case and pursue other options.
Facebook | Fan photos from ELWA Ministries Association USA (EMAUSA)
Pictures of Al Warden, Steve Kejr, Ellsworth Balzer et. al, installing transformers, new generators etc.
Cooling Water System
Cedarville Mechanical Engineering class project on ELWA Power system cooling pond with report. As a point of reference, the 20x30x3' cooling pond adequately cooled 1.1MW of gensets in the 1980s, contrary to the conclusions of the reports.

reference/bookmarks.txt · Last modified: 2018/05/28 22:29 (external edit)
 
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