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Circuits designed by David Johnson, P.E.

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Last Updated on:  08/18/2009 06:07:03 AM

Beepers & Buzzers

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Very Loud 3v Powered Beeper -- August 16, 2009
Getting a high sound intensity from a piezoelectric type beeper is not easy when the available DC supply is only 3v.  The circuit below is not only efficient but produces a very intense sound.  The circuit combines a voltage boost section with a resonant feedback network.  The voltage applied to the piezoelectric wafer is about 40 volts peak to peak.  The result is a circuit that generates an attention getting sound without drawing a lot of current.

Click on Drawing Below to view PDF version of Schematic

Beepers & Buzzers
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