Looking for component

Discussion in 'The Projects Forum' started by TDR, Oct 25, 2015.

  1. TDR

    Thread Starter New Member

    Oct 25, 2015
    4
    0
    Hey guys.

    I started a nice project in my house and i ran into some problem that I cant find a solution for.

    I have added a pic of my design so you could help me.

    As you can see in the picture i have two circuits. Circuit number 1 has a normal switch. It does his function and closes the circuit. Now, using a spst relay as component 1 I activate circuit number 2 . The mystery is component 2. I want circuit 2 to start working after relay 1 is closed, but I need circuit 2 to stay ON even if I open switch 1. So basically i want circuit 1 to activate circuit 2 and circuit 2 has to stay on "forever" no matter what happens with circuit 1.

    I have heard one option, which i couldnt apply on my own, is to use dpdt relay as component 2, but couldnt wire it up the right way.

    what do you guys think? is that even possible?


    Thanks :)
     
  2. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    This can be as simple as a latching relay.
     
  3. TDR

    Thread Starter New Member

    Oct 25, 2015
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    0
    what do you mean? could you explain some more please?
     
  4. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    I'm too busy writing limericks. Google "latching relay".
     
    GopherT likes this.
  5. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    You might investigate, "SCR". That is a self latching transistor switch.
     
  6. tracecom

    AAC Fanatic!

    Apr 16, 2010
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  7. #12

    Expert

    Nov 30, 2010
    16,284
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    Copycat!
    Here's the SCR circuit:
     
    tracecom likes this.
  8. TDR

    Thread Starter New Member

    Oct 25, 2015
    4
    0
    Ok.
    Thank you very much for your answers. I will search it all.
     
  9. TDR

    Thread Starter New Member

    Oct 25, 2015
    4
    0
    Ok.
    Thank you very much for your answers. I will search it all.
     
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