它与换向电流所不同的是不把镀件作阳极，而是间歇地停止供电，由于间歇中断电流，阴极电位随时间周期性地变化。
It and reversing current different is not to be, but with a anode intermittently stop, because the intermittent power supply current interrupted, cathode potential with time periodically change.
当电机转速一定时，通过级联减速齿轮带动电位器旋转，使得电压差为0，电机停止转动。
When the motor speed must, through the reduction gear drive cascading rotary potentiometers, the voltage difference is 0, motor to stop rotating.
但经常停止音量调理时，又轻易使电位器磨损而呈现毛病。
When frequently carries on the volume control, also is easy to cause the potentiometer to wear appears the breakdown.
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