This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Keyboar...
00:00:34 1 Types
00:00:43 1.1 Membrane keyboard
00:02:40 1.2 Dome-switch keyboard
00:04:31 1.3 Scissor-switch keyboard
00:06:02 1.4 Capacitive keyboard
00:07:56 1.5 Mechanical-switch keyboard
00:09:32 1.6 Buckling-spring keyboard
00:10:33 1.7 Hall-effect keyboard
00:11:32 1.8 Laser projection keyboard
00:12:36 1.9 Roll-up keyboard
00:13:13 1.10 Optical keyboard technology
00:16:01 2 Debouncing
00:17:01 3 Keycaps
00:17:37 4 Other parts of the PC keyboard
00:19:01 5 Keyboard switch matrix
00:19:52 6 See also
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SUMMARY
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Computer keyboards can be classified by the switch technology that they use. Computer alphanumeric keyboards typically have 80 to 110 durable switches, generally one for each key. The choice of switch technology affects key response (the positive feedback that a key has been pressed) and pre travel (the distance needed to push the key to enter a character reliably). Newer keyboard models use hybrids of various technologies to achieve greater cost savings.
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