On Thu, 14 Aug 2008 04:32:44 +0300, "Yianni"
wrote:

"William Sommerwerck" wrote in message
...

The transducer is probably highly resonant at the operating frequency. If
you change the frequency, output is likely to be greatly reduced.



I don't think the transducer is so high resonant.

Your first three words are correct. The remainder of the statement is
not. It is very resonant.

At least the specific one.
On the other hand, I would like to try. Do you know which parts to change?