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Need help finding a solution - switch / Help for a noob - relays

Discussion in 'General Electronics Discussion' started by alon, Jun 7, 2011.

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  1. alon


    Jun 7, 2011
    Hi guys,

    I'm in need of a specific switch that will allow the following:

    - The switch needs to have 3 contacts (legs)
    - Switch OFF -> no contact between any of the legs
    - Switch ON -> contact between all of the 3 legs

    I've looked everywhere, but I couldn't find anything that fits.

    Can you advise on a switch that will fit?

    I was wondering, if I take a simple 3 leg on/off rocker switch and connect 2 of the leg with a diode, will it solve it?

    Attached Files:

  2. davenn

    davenn Moderator

    Sep 5, 2009
    hi there welcome to the forum

    I think you need to tell us all more about what you are actually trying to achieve
    I can only assume that you dont really want to short circuit the + and the - of a power supply as shown in your diagrams ? as that would result in a blown power supply

  3. BobK


    Jan 5, 2010
    You could use a 3PST switch to achieve this:

    o----/ o-----+
    o----/ o-----+
    o----/ o-----+

    Connect your three wires to one side of the 3 switches, and connect the other side of the three swiched all together.

    Last edited: Jun 9, 2011
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    You could also use a DPST switch. Just replace one of the switch contacts shown above with a link. DPST switches are far more common too.
  5. alon


    Jun 7, 2011
    Help for a noob - relays

    Hi guys,

    I have a simple circut,
    3 negatives (with no contact between them)
    1 positive (12V)

    I need to be able to conect the positive to the 3 negatives using a simple on/off switch.
    I assume the best way to do this is using a relay.

    - Am I right?
    - What kind/type of relay can I use?
    - How should the circut look?

    Thanks in advance,

    Attached Files:

  6. shrtrnd


    Jan 15, 2010
    This is probably an engineering question. I'm a tech.
    I think in terms of physical connection. I don't understand from the drawing, what it
    is you're trying to do.
    If this is theory, some engineer can probably figure-out what the drawing means.
    But for us hands-on guys, we'd need a little more information, about what it is exactly,
    that you're trying to do.
  7. Resqueline


    Jul 31, 2009
    I merged your two threads since they seemed closely related.
    I'm sorry I can't help you with any of your circuits, you're being too vague, and also using confusing terminology, so I can't tell you what you really need to know.
  8. poor mystic

    poor mystic

    Apr 8, 2011
    Last edited: Jun 26, 2011
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