Hey Guys
Just finishing up the board on a ZPM2 and I'm having an issue with the power. As soon as I connect the +9v lead from my dc jack to the board, it starts humming like crazy. Tried using power from an external test rig as well as a battery, same problem.
Any idea what the cause could be? Attached a 2mb video from iphone just to give a better idea
https://www.dropbox.com/s/31fpqff293rqlwq/IMG_3830.MOV?dl=0
Thanks guys!
Brian
Seems to be a grounding issue. Are all the grounds connected together properly?
thats it... thanks a lot!