Small board that holds two Texas Instruments LMD18245's to control a 4 wire stepper motor. The board can be placed on a breadboard for easy prototyping. Two LMD18245's allow up to 6A of motor current (3A per coil). With the DAC REF jumper you can have one DAC REF signal for both coils. It also still possible to use the internal 4 bit DAC's.

The 4 LED's in a row show the direction signals for both drivers, the other LED shows power okay. All is secured by a polyfuse and TVS diode.