Fan speed control circuit based on the NE555 time-base circuit

Published:2011/7/24 20:35:00 Author:Christina | Keyword: Fan speed, control circuit, NE555, time-base circuit | From:SeekIC

The NE555 of the circuit is connected into the square wave generator with the adjustable duty ratio. When the NE555 outputs the high level, the zero-crossing-on-off-type optocoupler MOC3061's primary stage gets the 10mA forward current to make the internal gallium silicide infrared emitting diode sends out the IR, this IR conducts the photosensitive two-way switch of the zero-crossing detector when the city electricity is crossing zero, and it turns on the power supply of the fan motor, the fan operates to supply the wind. When the pin-3 of the NE555 outputs the low level, the two-way switch turns off, the fan stops. The MOC3061 has the certain drive ability to directly use the internal two-way switch of the MOC3061 to control the electric fan motor without the power drive component.



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