I have built the "Sweet Portable Guitar Amp" but there is a very load hiss.?
I have built this
and its working fine, except there is a very load hiss along with the audio. I have only made 1 modification: I have connected the negative terminal of the battery to the 2nd signal of my stereo 1/4 inch socket, and the ground to the ground circuit ground. This causes the circuit to turn on when a mono jack is plugged in.
Any ideas why I am getting this hiss? It sounds a bit like static on a TV but I have used shielded cable.