Power supplies connected to motor controllers can be shielded from voltage spikes by this shunt regulator. This version, which is the higher-power version, has 32 SMT shunt resistors populated on both sides of the PCB, a fixed set point of 33.0 V, and a shunt resistance of 4.10 ohms. The set voltage can also be altered by adding an external potentiometer. Summary The majority of motor controllers deal with situations where motor energy is returned to the power source, usually when the motor is slowing down. Usually a battery that can withstand the current that is fed into it serves as that power source, and the reverse current can be a useful "regenerative braking" feature that increases the overall lifespan of the