This video shows how to use a Roboclaw motor controller with an external PSU (instead of a battery). This isn't explained in the documentation and when using the Roboclaw with an external SMPS, it doesn't operate properly until you add a diode in series with the power supply.

RoboClaw 2x7A Motor Controller - https://www.servocity.com/roboclaw-2x...

15A Schottkey Diodes - https://amzn.to/2DQOJxh

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