Basic working of Operation of Servo Voltage Stabilizer When the Servo stabilizer receives an input current, with fluctuating voltage, the microprocessors in the electronic circuitry triggers the Servo motor driver. This in turn activates the servo motor, which moves across the windings of the auto-transformer. A Servo Stabilizer is a Servo motor controlled stabilization system that performs optimum voltage supply using a Buck\Boost transformer booster that captures voltage fluctuations from input and regulates current to the correct output.The working principle of a voltage stabilizer is very simple, its main function to keep stable the output voltage by increasing or decreasing the voltage level according to the unstable input voltage. ... So drop in input voltage will nothing effect in the output voltage, output voltage remain constant at the normal value.