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#8570
Billy
Moderator

What are the voltages on all the TL072 pins Jeff with it in and out of it’s socket

List them like this obviously indicating which is with it in the socket and with it out

1. 4.5v

2.

3.

4.

5.

6.

7.

8.

And just in case you don’t know pin on the top left at the dot / notch is pin 1

I’ve checked all of your component values and orientation which all look correct, can’t check pot values so I’d double check the correct values are in the correct place

Once you’ve posted voltages for the TL072 it should give us an indication of whether it is the cause of the oscillation i.e incorrect voltages causing mis-biasing etc

If you can post a picture of the rear of the pcb also