555 sleep induction unit circuit

Published:2011/5/23 18:54:00 Author:TaoXi | Keyword: sleep, induction unit | From:SeekIC

As the figure 16-1 shows, the astable multivibrator is composed of the IC1 and R1，R2，RP1，D1，C1, the oscillation period T=0.693(R1+R2+RP1)C1. The figure parameters' oscillation period T can be changed by adjusting RP1, it is about 80 seconds as well; tcharging is about 0.8 second. When IC1 outputs the high electrical level, J and J1-1 close, the power voltage VDD charges the C5. After 0.8 second, J releases, J1-1 returns to the closing state, the R4 is connected, so the C5's charging voltage gets through the R4 and R5.



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