so i made an amp in class for your ipod its i think 20 watts. uses two TDA200SR for both channels so right and left. im using a transformer to take the wall voltage down to twelve volts . and so far only one side works while the other side hums VERY loudly like a motor boat i guess. and only one of the TDA200SR is getting VERY hot even with a small heatsink on the other one is just getting warm. so Im wondering without showing you guys the schematic ( dont have it with me) can you tell me what this problem can be? too low voltage? too high? anything you guys can think of?