I designed and breadboarded a simple audio amplifier circuit and when I play audio through the speaker, it is pretty noisy and very quiet. The +5V is being supplied from a USB port.
I'm still probing and testing different spots, so I'll try to update with some scope shots and real measurements besides "it sounds quiet and noisy", but in the meantime, does anyone see any design flaws?
I'm thinking that I may not being supplying enough current and I've noticed that the inverted signal on the output of the second op amp seems to have a clipped voltage swing, about 1V less than the voltage swing on the output of the first op amp.
And as I've been typing, I'm wondering if I should tie the output of my push-pull outputs back to the op amps.