Joe Malone wrote: ↑
Mon Nov 29, 2021 2:37 pm
The opamp and power are working fine as pin 1 and pin 7 outputs are still at 12v. The rest are a bit out because you have the gain fully cranked which for a XLR input should be way too much gain. Something is wrong with the input or the meter wiring. You do have the meter going to +M-? and remember if they are reversed the meter it will push downwards which you can be hard to see as it will not move far. I would wire the meter directly to the input XLRs without the amps and see if you can get the meters working on their own without the amp input attached.
Thankyou for being so patient with me. I tried hooking up the xlrs directly to the meters and was pleasantly surprised that that even works. Now, it didn't really do anything until I cranked my source to near 0 dB, but it was promising to see. (Curiously, at that level the meter starts to act like a speaker of sorts. You can actually hear it playing.)
Now comes the part where I admit to being an idiot
. After that experiment I was convinced that the buffer had to be working. Turns out it was all along, at least, I'm pretty sure. After turning my source up a decent bit louder than expected, suddenly there was movement on the meters. The problem before was that I was attempting to adjust the buffer while listening to music with the amp on and connected to speakers. Naturally, I didn't turn it up very loud because I was right on top of the speakers. There seems to be a minimum input threshold where the buffer doesn't really do much of anything and I was simply never reaching that point.
I may still play around with some resistor values to see if I can drive the meters at lower listening levels, but at least now I know things aren't completely broken.