Read more about our Shunt Regulators here
This shunt regulator can protect power supplies from voltage spikes generated by motor controllers they are connected to. This version has a fixed set point of 33.0 V, a shunt resistance of 32.8 ohms, and four SMT shunt resistors populated on one side of the PCB. This version is intended for those who want to use this board with a higher-power external shunt resistor. An external potentiometer can also be added to change the set voltage.
When setting the voltage with a potentiometer, or to test the exact voltage of any particular shunt regulator, connect a higher voltage through a current-limiting resistor of at least several hundred ohms, and measure the voltage at the regulator. (Without the current-limiting resistor, the shunt regulator would do nothing if it is set higher than your test supply voltage and would go up in smoke if set below your supply voltage!) Typically, you should set your regulator to be about 10% above the supply voltage you are trying to protect.
Wiring diagram for adjusting the set voltage on a 'fixed Shunt Regulator.
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