Simple 555 Timer Monostable Circuit

Published:2012/9/17 21:41:00 Author:Ecco | Keyword: 555 , Timer, Monostable | From:SeekIC

The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. For shorter periods, a capacitor can be used to isolate the switch so that only the initial switch closure is seen by the timer input and the switch can remain closed for an unlimited period without effecting the output.



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