UEETEK 3 Pcs Stepstick Stepper Motor Driver Module A4988 Heat Sink for 3D Printer Reprap Engraving Machine Printer (Red)

Price: $9.99
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Product Features

Simple step and direction control interface Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay) Short-to-ground and shorted-load 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 to achieve higher step rates