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A number of ground-level power supply systems were developed from the 1970s through the 1990s, [8] but were not reliable or safe enough for commercial use. [9] The first ground-level power supply system developed to modern safety standards was the Ansaldo Stream, [7] although a competing system, Alstom APS, was the first to be commercially ...
The use of cigarette lighter receptacles to supply 12 volt DC power is an example of backward compatibility to a de facto standard. As a power connector, the lighter receptacle is larger, harder to use and less reliable than other DC connectors [citation needed]. Cigarette lighter receptacles are in widespread use in many highway vehicles and ...
A wiring diagram for parts of an electric guitar, showing semi-pictorial representation of devices arranged in roughly the same locations they would have in the guitar. An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing.
These supplied +5V, +12V, −5V, −12V, "power-good signal", and ground. The most notable difference from modern 20/24-pin ATX power connectors is that the AT power supply connector did not have a signal to turn on the power supply, and also did not supply separate, "always-on" +5V standby power.
For example, a 900-watt power supply with the 80 Plus Silver efficiency rating (which means that such a power supply is designed to be at least 85% efficient for loads above 180 W) may only be 73% efficient when the load is lower than 100 W, which is a typical idle power for a desktop computer. Thus, for a 100 W load, losses for this supply ...
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The addition is a 3 ⁄ 16-inch (4.8 mm) diameter round or U-shaped ground pin, 1 ⁄ 8 in (3.2 mm) longer than the power blades (so the device is grounded before the power is connected) and located from them by 1 ⁄ 4 in (6.4 mm) edge-to-edge or 15 ⁄ 32 in (11.9 mm) center-to-center.
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