Just did a light test on the fet board. First I powered it up. Then attached an ohm meter across the fets. When activated, the meter read close to zero. Good sign. Next I went and added a power supply at 12 volts, but current limited to 3 amps. Went fine. With light duty testing it seems to work. Looks like the next step is to connect it to the output of the control board and somehow simulate the load of a weld being made. The large 4 farad cap is just connected with jumpers. Nothing that can move much current. So we’ll see how that works for testing.

Still lots of machining to do. Still need to get the front panel layout designed and then machined. I still don’t have a clue how to mount it yet. The bar and round stock of copper arrived. So the welding probes need to be machined as well.