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stepper motor driver dm542a, 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 34 series stepper motor, Replace M542H -, Dm542 Stepper Motor Driver - China Motor, Stepping Motor | Made-in-China.com