The programme controller circuit of 555 fans

Published:2011/5/29 6:30:00 Author:Borg | Keyword: programme controller | From:SeekIC

IC4,C4,IC3,R11~R14,VT3 and so on consist a low-frequency oscillator whose duty cycle can be adjustable. IC3 is a 4-two-way analog switch CD4066, when the control pole is in a high LEV 1 , the switch closes and becomes conducting, the frequency and duty cycle can be changed by connecting with different charging circuits. When IC4 outputs a high LEV, J3 pulls in and the contact of J3-3 is closed, at the moment, the wind is the weakest. When J1 pulls in, J1-1 is closing, and now all the voltage of 220V is imposed on the fan motor, so the wind is the strongest. When J2 pulls in, the fan generates intermediate speed winds.



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