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POLOLU POLOLU HIGH-POWER STEPPER MOTOR DRIVER 3 — Stepper motor controller; DRV8711; SPI; 4A; Uin mot: 8÷50V vs POLOLU STSPIN820 STEPPER MOTOR DRIVER CARRIER — Stepper motor controller; STSPIN820; 900mA; Uin mot: 7÷45V — Robotitem