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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 12, 2010 12:08 PM

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 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

Master Schematic Category List  -  David A. Johnson, P.E.
Beepers & Buzzers
 
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