High efficiency buzzer

Details High efficiency buzzer High efficiency buzzer

1974-07-11

1976-03-16

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, 340393, 340388, G08B 310

Patent

active

039450040

ABSTRACT:
An electronic buzzer has a tuned oscillating striker and an electronic oscillator circuit matched to the striker tuned frequency and driving the striker by close coupling of a driving coil to a core member which forms part of an electromagnetic circuit with the striker. The oscillator circuit also includes a control coil in the transistor base circuit and mounted within the driving coil for close coupling to the driving coil and the electromagnetic circuit. The control coil is optimized to have the maximum number of turns while still matching the effective input impedance of the transistor. A diode may be connected in shunt with the driving coil for improved feedback coupling and frequency tuning.

REFERENCES:
patent: 3530463 (1970-09-01), Spadini
patent: 3846792 (1974-11-01), Haigh

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