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

    Well-Known Member

    Dec 31, 2010
    86
    95
    Try to Google "latching relay circuit"
    Diagrams there should help.
     
  3. strantor

    AAC Fanatic!

    Oct 3, 2010
    5,025
    3,116
    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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