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555 sectional timing circuit

2015-01-31 17:18  
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555 sectional timing circuit
As shown on the figure 6-19, the mono-stable time delay circuit consits of the IC1 and R1,RP1,C1. The mono-stable timing circuit consists of the IC2 and R2,RP2,C3.They constract the sectional timing circuit. Pressing the AN about 2s, the IC1's 3 foot is low power level. The IC2 reset, the 3 foot is high power level and the K will be pull-in. Then the C2 will discharge by the RP1 to the 1/3VDD. The IC1 will flip and be the high power level. The IC2 will reset and K will release. The first timing, t1=1.1RP1C1, about 27 minutes. The second timing, t2=1.1(RP2+R2)C3, about 27 minutes. The total timing, T=t1+t2, about 54 minutes.