A friend has a circuit that turns a pin hi 4.5V to low 0.1V,
current is about 10ma. He has a piezo speaker connected to
the pin and to ground. So when he sets the pin high
he wants the piezo speaker to buzz, and when he sets
it low he wants it off. However, when it goes low it's not
at 0V so their is a noticable hum from the piezo. What's the
easiest way to keep the pin at OV, to keep the piezo from
humming when it should be off.

Thanks for any suggestions,
Kevin


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