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Mobius Strip and Mini Mu just passing clean signal

Started by wizestwizard, February 16, 2026, 03:26:03 AM

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wizestwizard

I'm working through a pile of boards that I finally got around to, I'm having some weird results with both the Mobius Strip and Mini Mu. Both are just passing clean signal, bypassed or not, and no controls appear to do anything on either. The switching board works and LED lights up etc. On the Mobius Strip, all voltages match up to those posted in the build doc, on the Mini Mu (I've built this pedal before, so extra frustrating here lol), everything is right EXCEPT pins 1 and 5 of the OPA134 should both be ~ -8.5 V and are +8.2 V and 0 V respectively *EDIT - this is from a bad OPA134, switching it out fixed the voltages but not this issue*. Pictures of both builds attached here. I've built probably 10-15 VFe pedals and have never had this issue before. Any input is appreciated!

Derek

madbean

Do you hear the relay click when you turn the effect on?

wizestwizard

Yep! Relay is definitely working, the bypass board itself appears to be working as the LED turns on and there is a n audible blip in the signal upon turning on, similar to other VFe pedals I've built. I was initially thinking somehow I had messed up the bypass boards since I built them together, but I also built a Tractor Beam at the same time and that's working fine... very strange.