A high-efficiency and energy-saving ventilation fan
A high-efficiency energy-saving ventilation fan technology, applied in the electronic field, can solve the problems of high energy consumption and poor ventilation effect of the ventilation fan, and achieve the effect of saving electric energy and good ventilation effect
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[0009] The present invention will be further described below in conjunction with the accompanying drawings.
[0010] Such as figure 1 As shown, the high-efficiency and energy-saving ventilating fan of the present invention uses the time-base circuit NE555 chip as the control core to construct the circuit. The circuit adopts 220V mains power through transformer T1 to transform and rectify bridge D1-D4 full-wave rectification, and then through capacitor C1 in turn. Filtering, three-terminal voltage regulator 7812 voltage stabilization, after filtering by capacitor C2, DC 12V power supply is obtained for power supply; pin 4 and pin 8 of NE555 chip are connected to 12V power supply, pin 7 is connected to one end of resistors R1 and R2, and the other end of resistor R1 Connect the 12V power supply, the other end of the resistor R2 is connected to one end of the adjustable resistor RP, the other end of the adjustable resistor RP and the adjustment end are connected to pins 2 and 6 o...
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