Indicator light circuit providing normal and emergency indicatio

Details Indicator light circuit providing normal and emergency indicatio Indicator light circuit providing normal and emergency indicatio

1975-04-07

1976-12-21

Caldwell, John W.

Communications: electrical

Systems

Call station

340213R, 340331, G08B 2100

Patent

active

039991768

ABSTRACT:
An indicator light circuit utilizing a single lamp and providing continuous illumination during normal operation and on and off flashing during an emergency condition. The circuit can also provide an indication wherein the lamp is continuously on but pulsating bright and dim. The indicator light circuit can thus provide four visual indications: (1) Off; (2) Normal on; (3) Flashing on and off; and, (4) On, but pulsating bright and dim. The invention is particularly adaptable for use to provide motor running and relay trip indication.

REFERENCES:
patent: 3107348 (1963-10-01), McNeill
patent: 3246310 (1966-04-01), Keller et al.

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