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Stepper motor - NEMA-17 size - 200 steps/rev, 12V 350mA : ID 324 : $14.00 : Adafruit Industries, Unique & fun DIY electronics and kits
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Stepper motor not functioning properly on 12v battery but on 12v wall adapter - Motors, Mechanics, Power and CNC - Arduino Forum
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voltage regulator - Powering Arduino and stepper motor from a single 12 V power supply - Electrical Engineering Stack Exchange
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