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Thread: can anyone design a pulse circuit......

  1. #1
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    can anyone design a pulse circuit......

    can anyone think of a circuit that will - when receiving 12v, switch a transistor on for about a second and then switch off ? ( can this be done simply with a capacitor or something? )
    James
    www.digital-car.co.uk - The UK CarPC Forum

  2. #2
    Newbie SuperSonic's Avatar
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    This should serve you right.

    I made it myself too it is fully functional and a breeze do make. Not my design!
    Attached Images Attached Images  

  3. #3
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    thanks, but I allready have a shutdown controller, i just want a circuit that when powered up with 12v closes a transistor for about a second then off again - according to the simulator the below image will work - but I would have thought it could be done simpler with a few caps and resistors?
    James
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    www.digital-car.co.uk - The UK CarPC Forum

  4. #4
    FLAC
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    Quote Originally Posted by Jamez_Warner
    thanks, but I allready have a shutdown controller, i just want a circuit that when powered up with 12v closes a transistor for about a second then off again - according to the simulator the below image will work - but I would have thought it could be done simpler with a few caps and resistors?
    James

    Just put the 10uf cap in the holes. round is minus and square is plus.

    -Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  5. #5
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    i have ( works ), but of course we have hit the problem of it malfunctioning when I turn computer back on before timer has expired
    James
    www.digital-car.co.uk - The UK CarPC Forum

  6. #6
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    This site should get you going.

    http://www.the12volt.com/relays/page5.asp

  7. #7
    Raw Wave
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    This site should get you going.

    http://www.the12volt.com/relays/page5.asp


    Wow...didnt know someone can even think of using 5 relays just to do something very simple. He must have lots of spare relays.

    Its an interesting page though

  8. #8
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    thanks ricky that's perfect - I have formed the following diagram:

    this means with jeff's shutdown controller - it will give a power on pulse everytime the pc recieves power so you can't lose sync by turning key again while the timer to shutdown is still counting... ( ppl with jeff's controller will understand )
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    www.digital-car.co.uk - The UK CarPC Forum

  9. #9
    Raw Wave
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    Jamez_Warner

    I think you supposed to thanks someone else

  10. #10
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    lol
    www.digital-car.co.uk - The UK CarPC Forum

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