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Piezo Amp

Published in issue 301, July 2001

This circuit takes advantage of back-e.m.f. (electromotive force) to amplify the voltage across a piezo sounder. Ordinarily, IC1 would only achieve a gentle beep. However, the addition of a very high inductance choke of a few Henry — in this case the coil of a miniature reed relay is used — achieves a penetrating screech, and represents an easy method of obtaining considerably more volume in such a circuit.

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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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