When you need some serious grunt and the small stepper motor controllers just won't deliver then this one is for you.
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Max Voltage: 16V
Max Current: 30 A
Continuous Current: 14 A
Current sensing available to Arduino analog pin
MOSFET on-resistance: 19 mΩ (per leg)
Maximum PWM frequency: 20 kHz
Other Features: Thermal Shutdown, Undervoltage and Overvoltage shutdown