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The controller worked great when I kept the wattage down on the load side. unfortunately it was not up to running my circuit. I was trying to vary an 18v 4 amp circuit and the thermal fuse would soon get very hot and shut down. Again it worked great at lower power levels.
In the past I've always tried just using a potentiometer to control small motor speed or heating elements. I used one of these on a motor and one of a hot wire foam cutter. PWM is so much better and these worked great.