> 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.

You can get twice the voltage and about 4 times the power out of one of
these by driving them with two pins with signals on them in anti-phase. When
A is up B is down and vice versa.  This can make the difference between low
& OK output levels.

An interesting caution. When using these directly connected to a processor
pin NEVER tap them sharply. They act as voltage generators when mechanically
excited and a tap can generate enough energy to destroy a processor ;-(.
Some designs have failed when a piezo which is mounted inside a box has been
subject to a severe shock. The technology is essentially the same as used in
piezo fire lighters. I've never heard of anyone using a fire-lighter as a
speaker, but ... :-)


        RM

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