Review on 🔌 MicroStepping Subdivision Controller: Stepper DC9 42V by Dan Sturm

Schematic was not included, controller only, so make sure you get the info from the product page or other online sources. I tested this on a small NEMA 17, 1A motor and controlled it with an Arduino. Had fun seeing that they did all the microstepping adjustments. The radiator did not heat up at all with this light load. The inputs are LED optocouplers (8-15mA) and since both the anode and cathode connections are open, you can treat these inputs as active-low or active-high with your own wiring. One thing is not obvious: when ENA is not connected (off) the motor winding is constantly energized to hold it in place and setting ENA (on) allows the motor to freewheel.