555 timer Mono stable (one shot) circuit circuit


Posted on Feb 6, 2014    3896

The two circuits 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..


555 timer Mono stable (one shot) circuit circuit
Click here to download the full size of the above Circuit.




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