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RioRand 12V-40V 10A PWM DC Motor Speed Controller with Knob-High Efficiency, High Torque, Low Heat Generating with Reverse Polarity Protection, High Current Protection: Electric Motor Controls: Amazon.com: Industrial & Scientific
PWM DC Motor Speed Controller, 12V/24V/36V Regulator Potentiometer Overload Protector Motor Speed Control Board 15A - - Amazon.com