Anti-chatter circuit for small portable apparatus

Details Anti-chatter circuit for small portable apparatus Anti-chatter circuit for small portable apparatus

1981-06-25

1983-11-22

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307246, H03K 1756

Patent

active

044171552

ABSTRACT:
A signal produced by connecting the electrical contacts of a mechanical switch is read into a circuit without chatter only when the switch is closed longer than a selected time period. A first memory stores and outputs a switch actuation signal on the occurrence of a read signal, and erases the stored signal when the switch actuation signal is removed. A second memory outputs a square wave pulse on the coincidence of a later read signal and the first memory output. Electrical noise lasting less than the selected time period does not produce an output. The selected time period can be varied by using independent, phase-shifted read signals for each memory.

REFERENCES:
patent: 3624518 (1971-11-01), Dildy, Jr.
patent: 3694667 (1972-09-01), Staker, Jr.
patent: 4030284 (1977-06-01), Portmann
patent: 4057738 (1977-11-01), Nishimura
patent: 4198579 (1980-04-01), Ebihara et al.

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