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Some pc beepers operate direct from 5v dc, and others ac, you could write some software to toggle a pin of your microcontroller at say 2khz, this can then be connected to your piezo, to get increased voltage and volume you could use a transistor with the inductor accross the piezo.
Hi,
I have seen two type of buzzer piezoelectric..one work directly to power supply and secound does no it is used in PC...
here is pic of it pls tell how to use it with uC...??
**broken link removed**