Audio-detector alarm

Details Audio-detector alarm Audio-detector alarm

G - Physics

08

B

349/30

G08B 13/16 (2006.01) G08B 3/10 (2006.01)

Patent

CA 1122692

AUDIO-DETECTOR ALARM ABSTRACT OF THE DISCLOSURE An intrusion alarm circuit including a single electro- acoustical transducer, such as a diaphragm-supported piezo- electric element, connected to an amplifier in a positive feedback loop configuration. The transducer functions as both a sound pickup and sound generator. When the ambient sound level exceeds a preselected threshold level, the resulting vibration of the transducer generates a voltage which activates the amplifier, whereupon the transducer vibrations are sustained and amplified in the manner of an oscillator, thereby producing an audible alarm.

333970

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