jimilee
Well-known member
This is what it does past about 7 o'clock. I still have distorted audio and this.
Both adapter and battery. It does not.What's the power source? Does it make any difference if you run it off battery?
Me too, but I have audio in addition to this wonderful buzz. I’ve been away from it. I’m gonna wait a couple of days and go back to it. Do you happen to have IC voltages by chance?Oh yeah, that's much different than the unboxed oscillation I have with the circuit. Sounds like grounding hum to me
Sorry, yes, just barely up. Same sound with nothing plugged in. All the grounds connect where they’re supposed to. I got the voltages from @Giorfida, those all look good. Solder has been reflowed for a third time. Ran a lead between all the components on the solder side to make sure there weren’t any invisible bridges. Real head scratcher.@jimilee what do you mean 7 o'clock? 7/10 on the gain pot? Or just barely up?
Sorry, 7:00 equates to SSW, pot in off position for me.
Same sound with nothing plugged in?
Ah, ok, I see what you’re saying. I can do that. The IC is socketed, I have tried several different ones including the 1044. I’ll check the socket legs to see if there are any bridges.Actually, my idea wasn't to check for ground where there should be ground, it was to check for ground continuity where there shouldn't be ground, like the side of components facing the audio path or in it directly.
Is that electronically feasible? I think so ...
If your solder side is clean, maybe look at the solder points between the belly of the ic and the board (or the sockets and the board). It's possible a bridge could exist there between the pins on the top side, maybe, if the solder bubbled out.
Maybe a bad IC or poorly seated leg? Can't remember if you socketed them.
I’m waiting on a few replacement parts. I will probe next. The reason I didn’t do it yet is because on the last one, it was somewhere around the diodes. I’m getting the proper diodes instead of a substitution.After visual inspection, audio probe is the way.
I am definitely not an expert, but I would suspect so. Maybe a fault/soldering on a coupling capacitor?If there is overdrive signal in addition to the buzzing noise, would there be v+ in the audio path?
I’ve reflowed about three times. All the parts are checked and checkout. I’m pretty sure it’s a part. This is the second time I built it, and I used a few of the same pieces from the last build. I got the same buzz on that one, too.I am definitely not an expert, but I would suspect so. Maybe a fault/soldering on a coupling capacitor?
I agree with the idea to run an audio probe. It might be the most definitive diagnosis.