Don’t forget to solder the isolated wire between the two FET’s F5 and F6.

Hint: While soldering the wire, be careful not to melt the isolation. This may short circuit F6 and cause F3 on the top side to be overloaded.

Hint: IC3 (LM324) may not have a marker for Pin 1. At one side of the IC you’ll find a bevel instead. Place IC3 with the bevel on the side where you see the marker in the picture below.