Low power switch closure sensing circuit

Details Low power switch closure sensing circuit Low power switch closure sensing circuit

1979-12-17

1981-12-01

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

179 90K, 330277, 330288, 340365R, 34082579, G06F 302

Patent

active

043039073

ABSTRACT:
A matrix array of row and column conductors, electrically isolated from each other, with a key switch connected between a row and a column conductor at each intersection of a row and a column conductor. Each column conductor is connected to a normally non-conducting current sourcing circuit and each row conductor is connected to a normally non-conducting current sinking circuit. Each key switch, when closed, connects its associated row and column conductors causing current to flow between that column's current sourcing circuit and that row's current sinking circuit. The current sourcing and the current sinking circuits associated with the particular switch closure then produce signals indicative of that key switch closure.

REFERENCES:
patent: 3623082 (1971-11-01), Stein et al.
patent: 3660826 (1972-05-01), Lins
patent: 4069659 (1978-01-01), Harris et al.
patent: 4148017 (1979-04-01), Tomisawa
patent: 4199750 (1980-04-01), Taguchi

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