Audio-detector alarm

Details Audio-detector alarm Audio-detector alarm

1978-09-06

1979-10-09

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340566, G08B 300, G08B 1300

Patent

active

041707699

ABSTRACT:
An intrusion alarm circuit including a single electroacoustical transducer, such as a diaphragm-supported piezoelectric 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.

REFERENCES:
patent: 3739299 (1973-06-01), Adler

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