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
Leadshine Dm542 Digital Stepper Driver 0.5-4.2a 20-50vdc For Nema 17, 23, 24 Stepper Motor Controller - Motor Driver - AliExpress