jojofogarty01
Member
I've got an issue, I'm getting crazy oscillation on a phase 45 PCB I built (watch youtube video). I've tried wiring every which way, cleaning flux residue, switching the IC's, looking for cold joints. I can't seem to figure out what the issue is. The only thing I knowingly did wrong was installing the Zener Diode backward (the cathode was the non-stripe side); but I figured that out and switched it. I don't see that being the issue anyway. Transistors are matched pair. IC's are TL072 (tried tayda batch and amplified parts batch). Please any help would be greatly appreciated.
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