Voltage drop warning apparatus with negative-resistance device

Details Voltage drop warning apparatus with negative-resistance device Voltage drop warning apparatus with negative-resistance device

1974-12-30

1976-07-13

Caldwell, John W.

Communications: electrical

Systems

Call station

307235A, G08B 2100

Patent

active

039696979

ABSTRACT:
A series connection comprising a transistor (4) and a light-emitting diode (3) is connected across a D.C. power source (+Vcc), and one end of a negative-resistance device (1) is connected to the base of said transistor (4) and the other end thereof is connected to an end of said light-emitting diode (3), which last-mentioned one end is connected to the D.C. power source (+Vcc). The circuit constituted as above memorizes an occurence of voltage drop which enables bistable switching in the negative-resistance device, thereby energizing the light emitting diode to light. The circuit can be used to indicate voltage lowering or interruption of an A.C. power supply, or weakening of a battery.

REFERENCES:
patent: 3379085 (1968-04-01), Burton
patent: 3537090 (1970-10-01), Schartmann et al.
patent: 3603811 (1971-09-01), Day et al.
patent: 3737731 (1973-06-01), Zeewy
patent: 3813664 (1974-05-01), Geyer
patent: 3854089 (1974-12-01), Emler
patent: 3877001 (1975-04-01), Bogut et al.

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