robgar91 wrote:
I'm by no means one of the experts here, but while you hang out waiting for some great help maybe i can offer a suggestion. Even though you have experience with this stuff, a lot of your soldering lools like it could use some re-doing or touching up. A few joints have holes in them, and in particular the joints that connect wires are pretty dull, and don't seem to coat the whole wire.
Good advice. I would work through the process described here:
http://www.byocelectronics.com/board/vi ... =9&t=52188I would definitely switch to a regulated PS. Unregulated units are often noisy and could be the source of the hum. Poor grounding often causes that, as well.
If going through the solder joints doesn't help, your best bet would be to use a
signal tester to trace the circuit path from the input through the four transistor stages and pinpoint where the signal is dropping out.
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