On Tue, 13 Jan 2004 10:39:15 -0600, "RB"
wrote:

No marks whatever. That's why I am trying to figure out some simple,
practical way to figure out what the design freq is. Nothing comes to
mind, though.



If you have a variable audio generator, hook it to the transducer.
Place an AC voltmeter across the transducer and slowly tune the audio
generator around the the most common frequencies that the transducer
could be. You should see a sudden rise in the voltage when you hit the
frequency.

Regards
Gary