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Switches and diodes

Discussion in 'General Electronics Discussion' started by is_that_smoke, Nov 19, 2016.

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  1. is_that_smoke

    is_that_smoke

    2
    0
    Nov 19, 2016
    I have a SP 2 way retractive switch centre off that operates points on a model railway I’m building these only require a momentary pulse to change over. I want to add indicator lamps to this and have some pulse operated change over latching relays so they would give me a permanent supply to the indicator lamps. I have tried this and it works.

    I was wondering if I can supply these from the same switch and if so what type of diode can I fit to stop the supply coming back onto the opposite switch terminal and triggering the points.

    I have sort of done a drawing I hope helps explain.

    The relays can use anything from 3V – 12V to latch so any volt drop across the diode is not a great problem.

    points and relay switch.png
     
  2. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    I am assuming the common connection also switches over? What current does your relay draw, do you know?
    Thanks
    Adam
     
  3. is_that_smoke

    is_that_smoke

    2
    0
    Nov 19, 2016
    Adam.
    Only the positive line switches.
    The relay coils have there own power supply, the trigger line is only a signal to the board to fire the relay so I would assume only mA's picture of relay board below.
     

    Attached Files:

  4. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    Ok. Well current is measured in mA but how many. Whats the part number on the relay?
    Thanks
    Adam
     
  5. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    what you are talking about is first year electronics. they are called schottky(pronounced SKOT-KEE) diodes and they are used between the signal and ground. feel free to corrent my feeble brain...
     
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