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I think you need to make the pcb that is shown on its datasheet and use the same capacitors shown.I tried to fix the caps on the 7240, but it is still barely working, I am an a loss right now
proto-board from RadioShack is poor quality. It warps and breaks, its holes are too big and its copper strips are too thin and poorly glued.Alright, I am using a protoboard from radioshack for this, I had a few spares lying around.
I recommend that you look at the pcb design in the datasheet. The capacitors at the output must be good at high frequencies so ceramic or film capacitors are shown. You used electrolytic capacitors that are poor at high frequencies and maybe they cause your amplifier to oscillate at a high frequency instead of amplifying audio.Two of the caps are large and blue, because I could not find any of those values at my local electronics shop. Could that be a problem? They are the 2 caps in series with the output.