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I designed and built this motor controller to repair my SIP Ideal 120N wire feed welder. It took me over a year in my spare time, but the final design works very well and is based on the Arduino micro controller, so performance can be adjusted through software programming.

Motor and Controller
Here is the motor controller, power switch sensor potentiometer, and wire feed drive with tach pickup.

Controller mounted inside welder
Here is the controller installed in the welder.

Welder front showing controller
Here is the welder with the controller display showing.

Partial schematic of controller.