Voltage monitoring circuit

Details Voltage monitoring circuit Voltage monitoring circuit

1976-06-24

1978-04-11

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

250381, 331108D, 331111, 340248D, G08B 1710

Patent

active

040841561

ABSTRACT:
Circuit for indicating when a voltage indicative of a condition, such as the presence of smoke, changes to a value outside of a given voltage range. It includes an oscillator which oscillates in response to a value of voltage within said range and which stops oscillating when the voltage changes to a value outside of said range. A circuit coupled to said oscillator sounds an alarm when the oscillations cease.

REFERENCES:
patent: 3021514 (1962-02-01), Regis et al.
patent: 3588690 (1971-06-01), Griffin
patent: 3689883 (1972-09-01), Hill
patent: 3781841 (1973-12-01), Hughes, Jr.
patent: 3805184 (1974-04-01), Visioli, Jr. et al.

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