Piezoelectric audible indicator circuit

Details Piezoelectric audible indicator circuit Piezoelectric audible indicator circuit

G - Physics

08

B

84/63

G08B 3/00 (2006.01) G08B 3/10 (2006.01)

Patent

CA 1104388

PIEZOELECTRIC AUDIBLE INDICATOR CIRCUIT Abstract of the Disclosure An audible indicator circuit including a piezoelec- tric crystal and transistor device, that is of extremely simple and inexpensive construction and has its on-off operation selectively controlled in response to an auto- matic or manually applied control signal. The piezoelec- tric crystal is connected between the collector and emitter electrodes of the transistor, so that with an "on" control signal applied to the base electrode and a supply voltage of magnitude that exceeds the collector to emitter breakdown voltage coupled to the collector electrode, the circuit is caused to oscillate and thereby emit an audible signal.

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