Lamp outage indicator circuit

Details Lamp outage indicator circuit Lamp outage indicator circuit

1978-10-12

1980-02-26

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

307 10LS, 315 82, 315135, G08B 2100

Patent

active

041908309

ABSTRACT:
An indicator circuit for indicating whether an incandescent type lamp is burned out. The indicator circuits include a voltage reference source and an indicator LED which is normally biased just below the knee of its conduction curve, but which is biased into conduction whenever the monitored lamp burns out. A bridge circuit is utilized so that relatively small variations in power source voltage do not affect the operating point of the circuit.

REFERENCES:
patent: 2071911 (1937-03-01), Young
patent: 2165569 (1939-07-01), Obermaier
patent: 3391302 (1968-07-01), Weingarden
patent: 3443215 (1969-05-01), Bradley
patent: 3660813 (1972-05-01), Rumpf
patent: 3774188 (1973-11-01), Bial et al.
patent: 4087696 (1978-05-01), Bull
patent: 4091292 (1978-05-01), Sibley
I.B.M. Tech. Discl. Bull., vol. 14, No. 5; Resistance Testor by A. Yanischeff, Oct. 1971, p. 1368.

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