It consists of auto-transformer, servo motor, automatic control circuit and so on. When utility is not stable or
the load fluctuates, the automatic control circuit modifies the control output according to the output voltage
change of power supply, which is used to drive the servo motor, and then the servo motor adjusts the carbon
brush of auto-transformer to maintain the output voltage at its rating and remain stable. APPLICATION Computers,
test equipment, lighting systems, security systems, X-ray systems, communication systems, medical equipment,
duplicators, audio equipment, industrial automation equipment, colour film development equipment, digital
control machine tools, calibration equipment, TV sets, office appliances.