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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 sold2024 Teeth Whitening Strip for Teeth: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 Features: 1. Optical isolation signal input; 2. Output current DIP switch is adjustable; 3. Bipolar constant current chopping method; 4. High segmentation: 2,4,8,16,32,64,128,256. 5,10,25,50,125,200; 5. TTL input signal compatible,while accepting differential