555 trigger and long time delay circuit

Published:2011/6/12 10:58:00 Author:nelly | Keyword: trigger, long time delay | From:SeekIC

As shown on the figure 6-7, this circuit adopts the dual time base circuit 556. The half of the 556 and R,C make up of a monostable delay circuit and putting it to cascade. Then the trigger and long time delay circuit will be constructed. According to the program, we need to design the every delay time: td=1.1RC. If R1=R2=R3=R4=R, C1=C2=C3=C4=C, the total delay time: T4=4td=4.4RC. If it has n grades, Tn=1.1nRC.



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