Keyboard sense gate

Details Keyboard sense gate Keyboard sense gate

1981-12-07

1983-11-08

Crosland, Donnie Lee

Communications: electrical

Audible indication

Percussion-type sound producer

340365E, 340365C, 364710, G06F 302

Patent

active

044145381

ABSTRACT:
Twenty-five capacitive keyswitches 16a-e are arranged in a matrix having five row conductors 12a-e and five column conductors 14a-e. A series of five pulses are fed to each row conductor 14a-e in succession through AND gates 41a-e controlled by a counter 34. Each time a row conductor 12a-e is pulsed, all of the column conductors 14a-e are scanned. When one of the column conductors 14a-e is scanned, the associated coupling transistor 54a-e is turned on and the associated discharge transistor 50a-e is turned off. The remaining coupling transistor 54a-e of the remaining columns 14a-e are off and the remaining discharge transistors 50a-e are on.

REFERENCES:
patent: 3721976 (1973-03-01), Kuijsten
patent: 3740744 (1973-06-01), Nakada et al.
patent: 4157539 (1979-06-01), Hunts et al.

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