Microstepping Motor Drives, Analog in/Step & direction control
CNC Digital Microstep driver DM542 Stepper Motor Controller 2-phase Digital Stepper Motor Driver 20-50V DC Max 4.2A for Nema 17, Nema 23 and Nema 34 series stepper motor, Replace M542 M542H - - Amazon.com
Stepper motor driver - The complete explanation | PoLabs.com
MD3 | US Digital
Microstepping Motor Driver with Step & Direction Translator - EEWeb