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Help With One Shot

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Larry Watkins

New Member
I need a circuit with an approximate one second pulse output delayed by three or four seconds when triggered that uses twelve volts dc. I can find delayed on circuits that don't shut off. Is this possible with a 555 timer?
 

KMoffett

Well-Known Member
You would need two 555s or a 556. the first one (section) as a monostable gives you the delay. The second (section) as a monostable, outputs the one second pulse.
http://home.cogeco.ca/~rpaisley4/LM555.html#20 See Two Stage Time Delay Circuit

Ken
 

MikeMl

Well-Known Member
Most Helpful Member
What does your trigger input look like? Level? Edge? Polarity?
 

Tony Stewart

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Most Helpful Member
Input = momentary switch to gnd or V+? or don't care
Output=highside switch for 1 sec after 3~4sec delay to 12V at what output current level or DC resistance ? and also non-retrigerable or don't care or what ? during these time periods
 

Larry Watkins

New Member
Thanks for the replies! You've been very helpful. The one shot would trigger a relay set for ten or twenty seconds. The relay would output 120 ac at fairly low current. I'm still working on it but may have a solution.
Thanx
 
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