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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 12, 2010 12:07 PM

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 Beeper & Buzzer Circuits

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ANOTHER VERY LOUD PIEZO ALARM BEEPER
This is yet another beeper circuit that really draws attention. It sweeps the drive frequency slightly to produce a very annoying sound. It uses a transformer to increase the drive voltage across the piezoelectric device to more than 200 volts peak to peak. It cranks out an ear splitting 120db when measured at 12 inches.
 

Click on Drawing Below to view PDF version of Schematic

Circuit Sweeping Tone Alarm Beeper designed by David A. Johnson, P.E. (June 27, 2000)

Master Schematic Category List - David A. Johnson, P.E.
Beeper & Buzzer Circuits
 
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