Please help - Need a Switch

Discussion in 'General Electronics Chat' started by jim6960, Dec 11, 2013.

  1. jim6960

    Thread Starter New Member

    Dec 11, 2013
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    I need to no what a switch would be called that is as described:

    "I need a switch that opens and closes a circuit when depressed down. Note : it can not do this like a normal limit switch by being pushed and released back up. It needs to signal a timer to start every time it time it is pushed then just reset when it is released"

    My timer needs a trigger powered for a split second to restart it.

    Any help would be appreciated .... Thank You
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Can you post your timer circuit?

    Ken
     
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Through the ramblings and mistake laden question I think what you are asking for is a "momentary" switch with either debouncing or delay on break timer functionality..
     
  4. inwo

    Well-Known Member

    Nov 7, 2013
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    I don't know of a switch like that.

    It takes a timer circuit called a one-shot.
     
  5. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Looks like the OP wants:
    Pushing and holding the switch button generates a brief "pulse" that starts the timer.
    Releasing the switch button generates something that resets the timer.

    I have no ideas without details...pulse length?, polarity?, voltage?, load?

    Ken
     
  6. inwo

    Well-Known Member

    Nov 7, 2013
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    Not my understanding. Could be wrong.

    I think OP wants a one shot pulse that is not lengthened by holding button or releasing.
     
  7. inwo

    Well-Known Member

    Nov 7, 2013
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    How about a differentiated pulse?
     
  8. jim6960

    Thread Starter New Member

    Dec 11, 2013
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    yes, I was wondering if there was a switch that would send a brief 1 or 2 second positive signal and I am using a 12v circuit.

    "A one shot 12v pulse that is not lengthened by holding button or releasing"

    I want to trigger a 6030 Altronix timer. I'm about to make a switch that will do what I need.
     
  9. inwo

    Well-Known Member

    Nov 7, 2013
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    I'll see if I can find that timer.
     
  10. inwo

    Well-Known Member

    Nov 7, 2013
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  11. inwo

    Well-Known Member

    Nov 7, 2013
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    If it's ~24vdc, try a 2.2uf capacitor in series with the switch. From + to trigger.

    That will differentiate the signal from the switch into a single pulse.

    I have no idea of the input impedance of the trigger, but it's worth a shot.
     
  12. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Looks like BELL OUTPUT is the source of power to the board, so the trigger is pulled-up to the + voltage from the BELL OUTPUT, thru a dry contact switch.

    Ken
     
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