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Thanks for the suggestion of adjusting trim until legs 7/8 are roughly half voltage. I'm getting more reasonable numbers now for all the ICs: TL022: 2-5 (fluctuating) 4.3 3.5-5 (fluctuating) 0 4.3 4.3 3.6-5 (fluctuating) 8.7 MN3207: 0 4.2 3.59 8.12 8.7 4.2 4.2 4.2 MN3102: 8.7 4.2 0 4.2 0.27...

Sorry for the delay. Yes, my voltage readings follow the order/numbering in your diagram. As for continuity, yes both the Teal and the Red sets in your image have continuity (respectively). R22: Yellow: 8.7v Blue: 2.9v R26: 33k confirmed by both the stripes and double checked with a multimeter.

Thanks! Yeah, I tried a 4558 today and got the same measurements.

Update: I'm getting a bit more of a chorus effect now that Fig sent me some verified MN3207/MN3102 ICs. I only notice the effect when I have both rate and depth turned all the way up. Even then, it's very subtle. I have tried dialing the trim pot a bit and there's definitely a sweet spot but...

Nicely done! Pedal building is more better when you make mistakes, because then you get to improvise a little.

Thanks so much! This is one of the most generous forums I've visited. Generosity FTW!

I mistyped that. Yes, confirmed that they're MN3102

West coast of the USA

Scrubbed the PCB nice and clean. It still doesn't work. I re flowed all the joints, tried a few more/other ICs and still nothing. I get a decent tone, sounds almost exactly like how it does in bypass. Just a very subtle modulation/vibe. I'm coming to the conclusion that all of these MN chips...

Good call. I'll give it a scrub a dub with alcohol tomorrow.

Oh yeah, here's voltage check on ICs: IC1 - TL022: 2.7-5.9 fluctuating 4.35 3.5-5.0 fluctuating 4.35 4.38 3.9-4.7 fluctuating 8.75 IC2 - TL072 5.65 5.65 5.65 0 5.65 5.65 5.65 8.85 IC3 - MN3207 0 4.26 4.87 8.18 8.75 4.27 5.28 5.28 IC4 - MN3102 8.75 4.27 0 4.26 .28 8.36 2.72 8.18

I reflowed the joints for R13, R10, R9, C2, and C4. I also checked the circuit with the other MN32017/3102 pairs that I bought. I found that only 2 pairs out of 8 pairs of MN ICs had any effect on the sound. When I have either of these 2 pair in the circuit, I get a very subtle modulation...

Thanks! Are you referring to pin 1 on the TL072 when you say pin 1 is off now? Based on the list you gave, that's what it looks like...

Yeah some have a rounded notch at the top some don't. I'll try some other pairs that they sent me...

Now I'm getting some different values: TL023: 2.7-5.9 fluctuating 4.35 3.5-5.0 fluctuating 0 4.35 4.38 3.9-4.7 fluctuating 8.75 MN3207: 0 8.75 6.03 8.18 8.75 0 .002 .006 MN3102: 8.75 8.62 .002 8.75 -.835 0 8.62 8.18 TL072: 0 6.89 6.89 0 6.89 6.89 6.89 8.85 What does it all mean!?

I'll take a look and re flow the solder leading up to that IC. Thanks!

TL022CP: 3-5v fluctuating 4.3v 3-4.8v fluctuating 0v .004v 4.38v 3.8-4.8v fluctuating 8.67v MN3207: 0v 8.69v 3.58v 8.1v 8.73v 0v .06v .02v MN3102: 8.73v 0v 0v 8.74v -0.6v 0v 8.6v 8.15v TL072CP: 4.34v 4.34v 4.34v 0v 4.34v 4.35v 4.35v 8.84v See anything noteworthy?

I'll write em down tomorrow when I'm back in the shop. Thanks for all your help!

Lol. Thanks for being patient with me. Yes, I had it backwards! Now I'm getting a blinking LED on one side and the other LED operates as it should when engaged. The blinking LED changes speed when I'm turning the rate pot. D100 is now getting 9.09v on one end and 8.85v on the other. The sound...

-9v at one end and -.019v on the other end