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The oscillation occurs at all settings, but changes character based on the settings. I got these j201s from guitarpcb.com. I’ve used others from the same batch in prior diy pedals without issue.

I swapped out the power supply caps, no changes. Double checked the values, orientations. The VREF that’s between the pins of the center 072 comes out to 3.15 but this doesn’t change when the signal is there or once it dies. I uploaded a short clip of what is happening because I’m not sure I’m...

Im having an issue with the Obsidius Preamp - when I connect it to power it comes on momentarily but then dies while letting out a high pitch squeal. I’ve swapped around the CD4049, the tl072’s and the j201s with little or no change. The resistors are standing because of spacing issues but I’ve...