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Switches in Series Combination?

Discussion in 'Electronic Basics' started by DaveK, Apr 25, 2007.

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  1. DaveK

    DaveK Guest

    Use a 2 pole rotary switch to give you the combinations, and use
    for the selection of any 2 switches or any one.. or all in series.
    basically, just tie them all in series.. and use diodes to select
    the pairs.
    The diode will prevent back feed to other combinations.
    The circuit will have to be DC.

    This was a reply that I received in regards to my original question
    below. The problem is I;m not quite sure how to set it up. Can anyone
    show it on a schematic? Thank you for your time

    Original Question
    Can anyone recommend a rotary switch, transistors, Ic's, or any
    component that may work for the following situation?
    I have three momentary switches in series (two mercury and one reed).
    What I would like to do is to be able to have the ability to allow
    one switch work alone, any combination to allow 2 to work in series,
    and all three to work in series as they are now? II have limited
    and would like to use the lowest profile component possible. I have
    minimal experience with the different type of components, but have
    time and a willingness to learn.
  2. John Fields

    John Fields Guest

  3. ehsjr

    ehsjr Guest

    Here's how I would do it, provided my diagram below
    accurately captures what you want:

    + ---Sw1---Sw2---Sw3---Load--- Gnd "All Three"

    + ---Sw1---Sw2---------Load--- Gnd "Any Two"
    + ---Sw1---------Sw3---Load--- Gnd "Any Two"
    + ---------Sw2---Sw3---Load--- Gnd "Any Two"

    + ---Sw1---------------Load--- Gnd "Any One"
    + ---------Sw2---------Load--- Gnd "Any One"
    + ---------------Sw3---Load--- Gnd "Any One"

    Assuming the seven possibilities above are what you
    want, you could wire it this way, with a toggle switch in
    parallel with each momentary switch:

    / / /
    +--o o--+ +--o o--+ +--o o--+
    | Tsw1 | | Tsw2 | | Tsw3 |
    | | | | | |
    + ---+---Sw1--+---+---Sw2--+---+---Sw3--+---Load--- Gnd

    That way, any momentary switch can be removed from affecting
    circuit function and replaced by a connection to the next.
    3 minature toggle switches will take up a lot less space
    than 2 rotary switches.

    By the way, the diagrams are shown using DC, but it will
    work fine with AC or DC.

  4. DaveK

    DaveK Guest

    Wow! Thank you so much!
    You made it very easy for me to understand, so much that I don't even
    have to ask any further question. This will work just great.

    Thanks Again,
    Dave K
  5. ehsjr

    ehsjr Guest

    You're welcome.
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