trouble indicator circuit

Discussion in 'General Electronics Chat' started by wolfcry911, May 20, 2012.

  1. wolfcry911

    Thread Starter New Member

    May 20, 2012
    2
    0
    Hello,
    I'm a new member and a novice at electrical circuits, so please bear with me ;)

    I'd like to create a device - a sort of trouble indicator.

    I have a 100mA circuit at around 35V. What I would like to make is a device that I can connect to the circuit that will register if the 100mA circuit had opened (and re-established itself). I'd like to use a simple led indicator that will stay on if the device had detected an open. How would I go about this? I know I'll need a 100mA relay, and I can wire the device to show trouble when the 100mA is open, but how do wire to 'retain' the trouble state?

    I'm sure a device like this already exists, but I'd like to learn how to create one on my own.

    Thanks
     
  2. PatM

    Active Member

    Dec 31, 2010
    81
    72
    Try to Google "latching relay circuit"
    Diagrams there should help.
     
  3. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    for this I would use an actual dual-coil latching relay instead of a relay latching circuit.
     
  4. wolfcry911

    Thread Starter New Member

    May 20, 2012
    2
    0
    Thank-you both :)
     
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