Jrk 21v3 USB Motor Controller with Feedback The jrk 21v3 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 with feedback for closed-loop speed or position control, or it can be used without feedback as an open-loop speed control The continuous output current is approximately 3A in the recommended operating range of 828V, with derated performance down to 5V and transient protection to 40V This version ships with connectors installed as shown (no soldering required)