Wiring shown overleaf will disconnect the battery when you
remove the jack plug from the input, and also when a DC plug is
inserted.
Snap the little metal tag off the pot to mount it flush in the box.
You MUST use some kind of heat sink on the legs of the transistors
when soldering. They aren’t keen on heat. Any more
than 3-4 seconds of iron and they’re toast.
Recommended assembly order:
Resistors, Caps, Transistors, Wires, Pots
1 2
3