In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

How are you operating the piezo?

Are you driving it at a fixed frequency, or does it vary within the application?

If it is a "fixed" frequency, then you might be able to find a resonate frequency near the frequency that you desire.

My point is that the resonate frequency will be noticeably louder than a non-resonate frequency.  Using this characteristic,
you could effectively change the volume simply by shifting the frequency slightly in or out of resonance.

To find the resonate frequency, just create a test program to sweep a range of frequencies and note where certain peaks are.


Here is a push-pull Piezo amplifier circuit that will efficiently drive a piezo off of a single I/O pin.
http://forums.parallax.com/forums/attach.aspx?a=169

Also, check out this thread...
http://forums.parallax.com/forums/default.aspx?f=6&m=294&g=4806#m4806

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