On 13 Aug, 02:31, "Yianni" wrote:
Hi,
I have a small ultrasonic cleaner. It's frequency is 40kHz, and I want to
increase it to about 50%. I expect about 15W output. Which parts I should
change? I suspect the two blue capacitors, but I'm not sure. My knowledge in
electronics is low.


WHY do you want to increase the frequency?

Dave W