billyp wrote:
Should there be a hum when touching the transistors or not? So the ones that hum are not grounded and the other two that dont hum are grounded?
Maybe, maybe not. That's why I said 'sorta'.
usually, when you get low output, it means there is a wonky resistor value somewhere, but it doesn't look like that's the case with your build. The hum when touching the transistors may be a symptom of a bad ground, or it could just be how they are. One typically doesn't rummage in a circuit when playing through it normally, so it's not a big deal if such a thing happens as long as you don't experience it while playing, if that makes sense. Could simply be some sort of resistive or capacitive interference caused by your body, which has both to a certain degree.
My point in all this is that what you are describing
could be a symptom of the larger issue, or it might not be. The same troubleshooting procedure should apply though:
-gettin signal? (a bit)
-getting voltage? (probably since it's working at least a little, and you didn't mention any LED issues.)
-components correct? (mostly, can't see the caps from the image)
-good solder joints and wiring? (We're here)
So going off the assumption that you have voltage and signal (albeit a low one), the next thing would be component placement, which as I said before, looks mostly good. So the next step would be your solder joints and wiring.
If you can snap a pic of the backside of the PCB, it may shed a little more light on the situation for us.
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