Control Circuit for a law-speed fan

摘要

A control circuit for a low-speed fan is connected between a power source and a drive circuit for a low-speed fan. The control circuit comprises a Zener diode and a transistor for stepping down the voltage to thereby output a preset working voltage suitable for low speed mode operation of the fan and to thereby avoid the drawbacks of uneasy or unsuccessful starting of the fan resulting from input of low or unstable power source voltage.