Don't forget these need a lot of voltage.  I have a bunch of the 3 lead
kind and you can run it with one lead, but you get low-moderate noise at
20 volts.

Lindy Mayfield wrote:

> It only has 1 lead!  (-:
>
> I've tried with a PWM wave.  If I plug the positive red lead to the output pin and touch a negative wire to the smooth, shiny backside, it buzzes nicely, I think.
>
>
>>if it only has 2 leads, you probably connect one to positive and
>>one to
>>negative, obviously i'd try red positive first.  if it has 3
>>leads, you
>>need a feedback circuit to drive it (these aren't very common).
>>if it's
>>just a piezo transducer and not a buzzer, you'll just get a
>>click unless
>>you send it a more interesting waveform than just turning it on.
>>
>
>
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