Piezo harn self-oscillating drive circuit

Details Piezo harn self-oscillating drive circuit Piezo harn self-oscillating drive circuit

1981-11-13

1985-01-29

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331113R, 331116R, H03B 536

Patent

active

044969147

ABSTRACT:
A circuit is disclosed for driving a piezo ceramic device as used in smoke alarms or other audio warning devices. The circuit detects the resonant frequency of the piezo horn and provides an alternating current at the resonant frequency of the horn for maximum sound output. The circuit has a self starting resonant oscillation characteristic. Two pairs of switches act in concert to alternatingly connect each side of the piezo horn to the supply voltage and ground, causing the maximum voltage swing across the piezo horn to be effectively twice the available power supply voltage.

REFERENCES:
patent: 3341841 (1967-09-01), Stampfli
patent: 3638223 (1972-01-01), Potter
patent: 3657634 (1972-04-01), Eastop
patent: 3763488 (1973-10-01), Klasing

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