A dimmer-type servo voltage stabilizeruses a rotating variac (a continuously variable auto-transformer, often called a "dimmer") to control the voltage.This "dimmer" utilizes a circular carbon brush to adjust the output voltage, similar to a dimmer switch in a light fixture.The servo motor, controlled by the stabilizer's circuitry, moves this carbon brush along the variac to compensate for voltage fluctuations and provide a stable output.
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