Driving a mini 2-phase 4-wire stepper motor - #16 by MarkT - Motors, Mechanics, Power and CNC - Arduino Forum
57BYG250B Stepper Motor 1.2Nm High Torque 3A Single/Double Shaft 2-Phase 4- Wires | eBay
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2-Phase 4 Wire Driver, DC10V-26V 2 in 1 Stepper Motor Driver ABS Photoelectric Insulation Space Saved to 28 Stepper Motors : Amazon.in: Electronics
Stepper Motor wiring
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Controlling Stepper Motors Using Power IO Wildcard, C Library Functions and MOSFET Drivers for Four-phase Six-wire Unipolar Permanent-magnet Stepper Motor