A One-hour Timer Circuit

Published:2011/9/3 10:34:00 Author:Zoey | Keyword: One-hour, Timer Circuit | From:SeekIC

The one-hour timer circuit has been shown in following picture. This circuit adopts high input resistance FET to input operational amplifier 3140, so as to add timing scale of 555 timer to its 100 times. Choose proportion of R3/R2 to change the multiplier index. Delay time is T=[（R2+R3）/R2] (1386R1C1), parameter in the picture is T=100R1C1= 1 hour.



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