Newbie needs help with a circuit

Discussion in 'The Projects Forum' started by User77, Nov 27, 2012.

  1. User77

    Thread Starter New Member

    Nov 27, 2012
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    Brand new here, lots of great info on the site! I am trying to build what I thought would be a simple circuit. I am try ing to come up with a way to apply ground to a wire, remove the ground, then re-apply it as a latched. I have 12 volts to trigger the circuit. Any ideas are greatly appreciated!
     
  2. BillB3857

    Senior Member

    Feb 28, 2009
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    Not sure I follow.... apply ground to a wire (what should happen at that point?), remove the ground (again, what should happen at that point?, then reapply it as a latched (what are you latching?)

    If you are talking about latching a relay, for example, by applying a momentary ground, that would clarify a lot.
     
  3. User77

    Thread Starter New Member

    Nov 27, 2012
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    I have a 12 volt wire that I need to use to trigger a circuit that will supply a ground output. But the ground output needs to go on/off/on (or ground/open/ground) and stay on until the 12 volt is removed.
    Thanks for any insight you may have.
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
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    What kind of timing is involved. How long are the on/off/ periods before the final ON?
     
  5. User77

    Thread Starter New Member

    Nov 27, 2012
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    Can be very fast, or up to a second or two. Timing should not be much of an issue.
     
  6. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
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    How much current is involved in the output ground? First thought would be to use a couple of NE555 timers daisy-chained and then possibly drive a relay with their output.
     
  7. User77

    Thread Starter New Member

    Nov 27, 2012
    4
    0
    I will try to get more specs, thanks for your help.
     
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