CurtZHP
Well-known member
Got the thing back together on the bench. Something has got to be horribly wrong here. No matter what I do, there's a constant hum on the output. Doesn't seem to matter how I ground things either.
I even went so far as to connect an output jack to various stages to hear where the hum first appears. No matter where I am in the circuit, it hums as long as the power is on. So, you'd think it was something to do with the power supply. But it doesn't seem to matter how I run the power ground or how I ground anything else for that matter.
The hum is loudest when the gain setting is all the way down. Turn up the gain, and the hum fades into the background and mic audio can be heard easily over it. But it's still there.
Right now, I have all the 0V points connected together, and I have the mic input shield connected to the "chassis" along with the mains ground. Hums like crazy.
I even went so far as to connect an output jack to various stages to hear where the hum first appears. No matter where I am in the circuit, it hums as long as the power is on. So, you'd think it was something to do with the power supply. But it doesn't seem to matter how I run the power ground or how I ground anything else for that matter.
The hum is loudest when the gain setting is all the way down. Turn up the gain, and the hum fades into the background and mic audio can be heard easily over it. But it's still there.
Right now, I have all the 0V points connected together, and I have the mic input shield connected to the "chassis" along with the mains ground. Hums like crazy.