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Cherry MX Blue: Clicky: 0.50 N: 0.60 N: 2.2 mm: 4.0 mm: MX1A-E1xx >50 million ... SMD LED compatibility ... On top of a variety of new switches being made, consumers ...
The Carter system, also known as the Chicago system, was a method of wiring three-way switches in the era of early knob-and-tube wiring. This now-obsolete wiring method has been prohibited by the USA National Electrical Code since 1923, [ 2 ] even in new knob-and-tube installations which are still permitted under certain circumstances.
Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]
Numbering of the ATX revisions may be a little confusing: ATX refers to the design, and goes up to version 2.2 in 2004 (with the 24 pins of ATX12V 2.0), while ATX12V describes only the PSU. For instance, ATX 2.03 is quite commonly seen on PSUs from 2000 and 2001 and often includes the P4 12V connector, even if the norm itself did not define it yet.
One of the two switches must be active (e.g., a transistor), while the other can be a diode. Sometimes, the topology can be changed simply by re-labeling the connections. A 12 V input, 5 V output buck converter can be converted to a 7 V input, −5 V output buck–boost by grounding the output and taking the output from the ground pin.
In 1980, incandescent lamps were improved, with a lower 12V voltage, a better lifetime and reduced energy consumption. [ 30 ] At the end of 1980, the great turning point was the introduction of Light Emitting Diode (LED) lights, which benefitted from an even longer replacement cycle and lower energy use.
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