Modified fourth gear fan speed governing circuit

The utility model relates to a modified fourth gear fan speed governing circuit, including main winding L1, secondary winding L2, the speed governing winding is with L3 and electric capacity C1, main winding L1 one end with the contact lead-out wire of said electric capacity C1 one end inserts the L utmost point, and the electric capacity C1 other end meets with secondary winding L2 one end, and speed governing winding L3 both ends meet with the main winding L1 other end and the secondary winding L2 other end respectively, said speed governing winding L3 goes up and draws forth the low-speed lead wire X who puts through with speed governing switch K one end through taking a percentage, intermediate speed lead wire Y, and the high-speed Z that goes between, and the speed governing switch K other end inserts N extremely, said high speed goes between Z and draws forth the more low-speed lead wire I who inserts speed governing switch K one end, has more concatenated step-down electric capacity C2 on the low-speed lead wire I, simple structure, equitable, the noise is little, and power is low, energy-conservation, the temperature rise is little