Home Forums GuitarPCB Build Support 4 – Track Fuzz (solved) Reply To: 4 – Track Fuzz (solved)

#8574
Billy
Moderator

Try using an adaptor that puts out 9v or a 9v battery to power it, 1.5v over voltage may be enough to affect the TL072 biasing and cause it to oscillate it shouldn’t but that could be the cause with 10.52v going in, good news is you know your voltage dividers R10, 11, 12 and 13 for VA and VB are doing what they’re supposed to do halfing the supply with your TL072 inputs and outputs being 5 odd volts

Use your finger to tap the TL072 to see if it affects it

Also take the readings with the TL072 out of the socket