SBG- slow motion metal detector

[ivconic]

The PCB drawn by my colleague from the People's Republic of China is verified to be good and error-free.
There remains the possibility that you made a mistake about the value of some component.
Or that you put some "fake" chip.
Have you seen my pcb?
100% of the components on it are used, removed from scrapped devices. They are 30 years old.
I'm not that frugal and I'm not penniless.
But experience has taught me that it's always better to trust old components, because we live in a crazy world.

[ivconic]

I have an interesting idea!
The only "controversial" thing on the pcb is fet 4393, i.e. its pin layout, I put J112.
Another confusing thing is the BC327 whose base goes to the Volume potentiometer.
That BC327 was turned upside down on the pcb by mistake.
I forgot to mention that. I apologize.
Check the pin layout on both transistors.

[ivconic]

It should go like this;