Body capacitance intrusion alarm apparatus

Details Body capacitance intrusion alarm apparatus Body capacitance intrusion alarm apparatus

G - Physics

08

B

340/124.2

G08B 13/26 (2006.01)

Patent

CA 1106933

BATTERY-OPERATED BODY CAPACITANCE INTRUSION ALARM APPARATUS ABSTRACT OF THE DISCLOSURE 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 possibly 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 non- latching embodiments are disclosed.

302638

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