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555 Sequence timer control circuit

2015-01-31 12:22  
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555 Sequence timer control circuit
As show on the figure 6-17, this timer circuit consists of the three-level monostable timer circuit. It can be used in the program's timer control and its time can be regulated by thePotentiometer. The monostable delay circuit consists of the IC1 and RPA, CA. Press the AN, the IC1 will filp and reset. The time: t1=1.1RPACA. When the IC1's transient stability is over, the foot edage will trig the IC2, then the IC2 will produce the timer width: t2=1.1RPBCB. The IC2 will trig the IC3 when its transient stability width is over, t3=1.1RPCCC.