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Piezo Amp

Based on a Labs project | October 2011 | Find it here
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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