the circuit of electrifying intermittent controller part 4

Published:2011/6/5 9:25:00 Author:Ariel Wang | Keyword: electrifying, intermittent, controller | From:SeekIC

At the moment of the mains power supply gets through,the voltage of C1 can't be changed suddenly.IC's 2nd-pin is low level(lower than Vcc/3),3rd-pin outputs high level.It conducts K1 to pull in. Its open point is switch in.The electric appliance A is conducted to work.At the same time VLI is lighted.After that,+9V voltage charges C1 by RP1 and RP2.It makes the voltage of C1 goes up and up.When the voltage is beyond 2Vcc/3.The in-circuit turns over.The 3rd-pin turns high level to low level.K1 releases.K2 pulls in.Electric appliance A stops working.Electric appliance B is conducted to work.At the same time,VL1 dies out.VL2 is lighted.



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