The long-term timing circuit composed of 555

Published:2011/6/23 11:15:00 Author:qqtang | Keyword: long-term, timing circuit | From:SeekIC

In the figure is the long-term timing circuit composed of 555. When S1 is pressed, timing is starting, and the time can be changed by adjusting RP1, the timing range is 3~220min. If capacitor C1 is 2200μF, then the timing range is 40~48h. The 3-pin of 555 outputs the timing control signal. If the circuit is used to control large power controller, a relay can be fixed between B and C or A and B, the touch spot of the relay is to control all kinds of timing loading.



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