Diode
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A diode is a component that allows current flow in one direction only.
Diodes are used on contact-switched keyboards to provide N-key rollover support. They also provide the electrical basis for light-emitting diodes, which amongst many other things provide backlighting for keyboards.
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Diodes on the Zenith Supersport SX keyboard
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Cherry MX Black switches with diodes fitted
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Surface-mounted diodes on a KBC Poker II PCB