Thank you very much for your answer, you helped me a lot and your answer means a lot to me. You are very kind and responsible. Greetings

this kind of sound can be heard almost inaudibly with m

https://youtu.be/KS-BHI667po

The sound is almost inaudible, but it sounds like a mechanical hard disk, you can hear some quiet screeching, scratching, is it the current flowing through the capacitors or