Reverse engineering the driver board from an ultrasonic cleaner with a short circuit.
from sima214@discuss.tchncs.de to askelectronics@discuss.tchncs.de on 08 Jan 2026 23:12
https://discuss.tchncs.de/post/52440382

I got a used ultrasonic cleaner with liquid damage for almost nothing and I am trying to repair it. So far I’ve confirmed that the board has a short circuit between live and neutral somewhere after the relay. Also, while reverse engineering it, I noticed something that seems weird. When the relay closes, it adds C3 in parallel to C2, both feeding the logic circuitry.

#askelectronics