Open circuit alarm

Details Open circuit alarm Open circuit alarm

1979-04-06

1981-01-06

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

307 9, 307126, 307141, 340 27R, 340522, G08B 2100

Patent

active

042439701

ABSTRACT:
A timing circuit for sounding an alarm for left-on main power switches, particularly in aircraft, includes a detector circuit for a secondary circuit of a complete circuit, a clock circuit controlled by the main power switch and an audioalarm circuit activated by the clock circuit when the main power switch is left on for a predetermined time following shut off of the secondary circuit.

REFERENCES:
patent: 3860904 (1975-01-01), Andersen
patent: 4107645 (1978-08-01), Lewis et al.
patent: 4127847 (1978-11-01), Stifter

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