Current sensing alarm circuit for a motor vehicle

Details Current sensing alarm circuit for a motor vehicle Current sensing alarm circuit for a motor vehicle

1975-12-17

1977-07-19

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340248D, 340249, 340253R, B60R 2510

Patent

active

040371948

ABSTRACT:
The alarm circuit is for detecting the theft of a vehicle and receives its power from the vehicle storage battery. The grounded battery cable is passed through a ferromagnetic toroid having one or more turns of wire wound thereon. An oscillator circuit couples to the toroid and establishes an AC voltage across the coil of wire. If the vehicle is entered the grounded battery cable draws current either from an illuminated light or from the ignition circuit causing a decrease in the voltage across the coil. This decrease in voltage is detected and an alarm is generated.

REFERENCES:
patent: 3706966 (1972-12-01), So et al.

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