Hello, I am trying to make an audio amp on my breadboard, for fun I guess. But it's not working! I am running off of this circuit of the lm1875. http://www.google.com/imgres?imgurl...=KBTBUZqGFLPp0QH3xIAg&ved=0CDEQ9QEwAA&dur=189 So I put the circuit together many times with different components on different breadboards and it just makes a HORIFIC sound. For the power I have a variac or 1-110v output transformer, then I am plugging in a 24v transformer on the output. (I do this so I can safely control the voltage.) I have the rectefier hooked up and everything on the breadboard. as the ground I am running a line strait from the ground on my variac to all the points in the circuit which must be grounded. any thoughts?