On Wed, 13 Aug 2008 04:31:49 +0300, "Yianni"
wrote:

Hi,
I have a small ultrasonic cleaner. It's frequency is 40kHz, and I want to
increase it to about 50%.

'it' being frequency? If so, I doubt it: the transducer is resonate
and would have to be replaced.

'it' being power? If so, I doubt it: the transucer is only going to be
able to handle a certain amount of power before failing.

I expect about 15W output.