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So I soldered in the missing and wrong components, but I'm still getting the same voltages on ICs (with only two exceptions). I edited/corrected the values in the list I posted above. Anyone know what would cause almost all of these values to be so low/negative voltages? I can't imagine that's...

Bah, nevermind everyone. I'm completely missing C3 (100nf). I'm going to get my brain examined because this is some really basic shit :-)

I just checked the LEDs and they're oriented correctly. That for the suggestion though. Here are the IC voltages: TL022cp: -.008 -.008 -.008 0 -.008 -.007 -.008 -.016 MN3207 0 .028 0 -.015 -.016 .025 0 0 MN3102 -.016 .029 0 .032 -.62 0 -.015 -.015 TL072CP (same readings if I use RC4558)...

I got the MN3207 and MN32102 pairs from a supplier on eBay.

That's an interesting question. C20 *is* supposed to be a film capacitor. Would that cause the pedal to malfunction? I could always flip the polarity, but Stickman393 is saying I've got it right. I might just order a 1uf film capacitor if that might make all the difference...

The plot thickens, but maybe this makes it more obvious what's going wrong ... I see now that the LEDs only light up when I've got the ground and hot wires mixed up on the dc jack. When I have the jack wired properly, I get no LEDs or sound when the footswitch is engaged. Bypass still works fine.

The LED is on 100% of the time. I'll poke around the LFO. Thanks!

Thanks, I'll give it a try. Maybe I was just adjusting the trim pot too erratically and missed the sweet spot...

This seems like it's going to be tricky to figure out. Bypass works fine, but the 2nd LED stays lit even in bypass. When I engage the switch, both LEDs light up, but I'm not hearing any of the Chorus effect no matter how much I crank the knobs/pots. I opted to go with the MN3207 / MN3102 IC...

Turns out, the problem was with the Capacitor in this part of the circuit. I swapped out the 100uf cap with a new one and now everything works perfectly.

Pinging this topic to see if anyone knows what values I should be getting on these components? On a second look, I realized that the LED pads aren't getting the voltages I think they should. I took the LED out and confirmed that it is working independent of the board. Now, when I measure the...

Thanks for the suggestions. I figured out the problem with PCB #3, so that's working fine now. Both pcb #1 and #2 appear to have two totally different problems. #1 needs more extensive troubleshooting, so I'll just follow up on that later. #2 is an interesting situation. The LED still doesn't...

One other thing that's weird: out if a batch of 7, these three were the only ones I tried to clean with alcohol once all the on-board components were soldered in. Couldn't have an effect like this though?

I checked all LEDs and they're fine. But apparently each of the three boards suffers from a different sort of fuck up from me. PCB 1: All Circuits make the right sound. Distortion LED: 0v All the others: 2.35v PCB 2: All Circuits make the right sound. Octave LED: 8.8v All the others: 2.35v...

I judged anode/cathode based on leg length, but I'll double check the actual LED bulb to make sure these aren't backwards. That would be a simple fix, provided my solder sucker does a good job cleaning it up.

You might be onto something, and maybe I somehow fried the LEDs when I was applying the heat shrink to the legs. If, when I test, the LEDs are getting voltage from the PCB—then I'll check the LEDs off-board to see if some of them are rotten.

That'll be the first thing I try. Thanks for the suggestion!

LOL, yeah I never imagined it growing to this level. One step further and it isn't a hobby anymore. I posted an earlier build on a local gear group on Facebook and more than a few people asked if I'd be willing to make more :-) .

I'm working on building a bunch of these pedals and about half of them have this problem where the LED for the distortion circuit won't light up even though the circuit is making the right sounds when engaged. I have mounted these "problem" PCBs in an enclosure yet, so maybe it's just a...

Any update on this? I realize it might still be traveling halfway around the world to get to you, but I'm curious what you've found. Otherwise, PCBs like the Muzzle are a bit useless until there's a solution :-(