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Elecbee YF-20 Stepper Motor Controller with Built-In Driver, DC 7–27 V, Up to 2 A, Speed and Angle ControlElecbee YF-20 stepper motor controller with built-in driver supports DC 7–27 V, up to 2 A, adjustable 0.1–999 RPM speed and 1–9999° angle control for 4-, 5-, 6-, or 8-wire stepper motor projects.