Switch closure responsive logic signal generation means

Details Switch closure responsive logic signal generation means Switch closure responsive logic signal generation means

1974-07-15

1976-06-08

Caldwell, John W.

Communications: electrical

Systems

Game reporting

235 92GA, 273 54E, 307247A, 340365E, A63D 504

Patent

active

039626997

ABSTRACT:
A command signal circuit accepting switch input information from a plurality of mechanical switches introducing undesired contact bounce, and providing a single clean output command signal. The circuit accomodates the plurality of input switches with circuit sections in parallel and "OR"ing to the output resolving all switch commands to one signal. Filtering is applied at a logic receiving end of lead lines to take out noise ripple induced with long leads, and the filter output is applied to both a one-shot multivibrator and a delay circuit having outputs "OR"ed together with the one-shot taking out the contact bounce on the leading edge with switch closure and the delay circuit taking care of contact bounce on the trailing portion of the switching action with switch opening.

REFERENCES:
patent: 3585374 (1971-06-01), Pollard
patent: 3705722 (1972-12-01), Bolger et al.
patent: 3725680 (1973-04-01), Silva
patent: 3755691 (1973-08-01), Cassarino

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