Thanks Dirk.
Duke, could you please just check the value of the Depth pot. I guess from the partial marking and code bellow that is A but I don't know the value. Thanks and sorry for bothering.
Here is the small switching-ps board. There are couple of uncertain things.
1. traces under the small switch are not visible so I'm not 100% sure that all connections are redrawn correctly.
2. Diode near the power jacks - markings tell nothing,, could be 1N4XXX or even zener diode 9-15V????
Solve this and we have a fine finished project.
Cheers to all.
PCB PDF: