Electronic chirper

Details Electronic chirper Electronic chirper

1975-03-03

1976-07-20

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 310

Patent

active

039710165

ABSTRACT:
An audio frequency signal generating circuit for producing repeated tones that includes a pair of transistors. The first transistor has its collector connected to a voltage supply line, has a capacitor connected between its emitter lead and earth, and also has an inductance connected to its emitter lead. The collector of the second transistor is connected to the other side of the inductance and the emitter is connected to the other side of the supply. The first transistor has biasing means to bias it into an operating condition and the second transistor is arranged with reactive feedback to cause oscillation.

REFERENCES:
patent: 3707716 (1972-12-01), Goralnick

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