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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
