A4988 driver widely used in 3D printers and small CNC machines Five optional step modes: full, 1/2, 1/4, 1/8 and 1/16 A4988 Motor Driver: 20 x 15 x 11mm Heat sink: 9 x 9 x 5 mm Thermal protection, over-current protection, ground fault protection Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor's rated voltage toachieve higher step rates
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