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Unipolar vs. Bipolar drive for stepper motors, Part 1: principles - Electrical Engineering News and Products
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Pololu - AMIS-30543 stepper motor driver carrier next to the popular Pololu A4988/DRV88xx carrier form factor for size comparison.
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The TMC2130 vs. the TMC2208: A Comparison of Two-Phase Bipolar Stepper Motor Drivers - Free Online PCB CAD Library
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