Simple Long Timer Circuit Composed of 555

Published:2011/5/17 5:33:00 Author:Joyce | Keyword: Simple , Long Timer, Composed of 555 | From:SeekIC

As shown in the figure is the simple long timer circuit .Start timing by pressing the switch AN, and you can regulate PR to adjust the time span,which ranges from 3 minutes to 220 minutes. If the capacitance C is changed to 2200μF，the time range will be 40 minutes to 48 hours. feet③ of 555 outputs timing control signals . If you use this circuit to control higher power, you have to connect a relay between end B and C or end A and B.You should use relay contacts to control all kinds of timing loads.



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