Dynamic contact checking circuit

Details Dynamic contact checking circuit Dynamic contact checking circuit

1980-10-17

1983-03-08

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

340513, 250205, G08B 2900

Patent

active

043762778

ABSTRACT:
A fail safe type of monitoring circuit for contacts is provided using an opto-isolator. The opto-isolator is energized in response to the operation of the contacts to clearly indicate whether the contacts are open or closed, and whether the circuit components are functioning in a valid manner.

REFERENCES:
patent: 3198236 (1965-08-01), Puech
patent: 3208060 (1965-09-01), Giuffrida et al.
patent: 3346855 (1967-10-01), Bishop
patent: 3387135 (1968-06-01), Engh
patent: 3555410 (1971-01-01), Basu
patent: 3562534 (1981-02-01), Jarrett
patent: 3575607 (1971-04-01), Edstrom
patent: 3588891 (1971-06-01), Porter, Jr.
patent: 3811126 (1974-05-01), Winger
patent: 3964044 (1976-06-01), Busco
patent: 4024412 (1977-05-01), MacAskill, Jr.
patent: 4092587 (1978-05-01), Selkow, Jr.
patent: 4127887 (1978-11-01), Tanaka et al.
patent: 4222047 (1980-09-01), Finnegan

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