Pololu Jrk 12v12 USB Motor Controller with Feedback (Item: 1393) The powerful jrk 12v12 motor controller is a highly configurable brushed DC motor controller that supports four interface modes: USB, logic-level serial, analog voltage, and hobby radio control (RC) The controller can be used as an open-loop speed control or for closed-loop speed or position control The continuous output current is approximately 12A (30A max) and the operating range of 616V (with transient protection up to 40V).