grounding

My headset mic has a constant static but it goes away whenever I touch a metal part of the case.

Hi I have posted this in another thread with a query specific to the touchpad but now I will re-post here for more general advice if I may. First - background: OK, here's an interesting project. I am trying to build a wooden laptop! Balsa wood to be exact. Now, I have little hardware...

I've an old Sansui 221 which had been crackling with the volume control. I cleaned all the knobs that were causing crackle successfully, they all seem very smooth now. However yesterday before I did this I was using it and after about an hour noticed a developing hum. After another 30 min it...