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POLOLU POLOLU-2134 — Stepper motor controller; DRV8834; 2A; Uin mot: 2.5÷10.8V; white vs POLOLU A4988 STEPPER MOTOR DRIVER CARRIER BLACK — Stepper motor controller; A4988; 1.2A; Uin mot: 8÷35V; Kit: module — Robotitem