Battery-operated body capacitance intrusion alarm apparatus

Details Battery-operated body capacitance intrusion alarm apparatus Battery-operated body capacitance intrusion alarm apparatus

1978-03-06

1979-11-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

330250, 331 65, 331108R, G08B 1326

Patent

active

041737555

ABSTRACT:
An intrusion alarm having an oscillator which is turned off by the body capacitance of a would-be intruder operates in the frequency range of 17-65 MHz. At this frequency, reliable discrimination between body capacitance and stray capacitance is possible and therefore sensitivity is increased while false alarms are reduced. Battery life is increased by providing a high resistance load in the stand-by mode to reduce battery drain to 500 microamperes or less. Latching and nonlatching embodiments are disclosed.

REFERENCES:
patent: 3465325 (1969-09-01), Goldfarb et al.
patent: 3549905 (1970-12-01), Johnson
patent: 3594786 (1971-07-01), Brunner-Schwer et al.
patent: 4091371 (1978-05-01), Mason, Jr. et al.

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