555 Ventilator automatic timing controller circuit

Published:2011/8/4 21:58:00 Author:Ecco | Keyword: 555 , Ventilator, automatic timing , controller | From:SeekIC

The controller shown as figure 12-31 is based on two roads of 555. IC1 and R1, PR1, C1 etc. form astable multivibrator. IC1 outputs alternating high and low output square wave to control the trigger IC2 monostable delay circuit, that is, when falling delay of IC1's output changes from high to low level, IC2 starts flipping set, timing.Adjusting RP2 can turn onthe fan for about 10 minutes and close 0.5 to 1 hour, it will change in automatic cycle to achieve automatic control of time.



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