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2pole Rotary Switch and Diodes HELP

Discussion in 'Electronic Basics' started by DaveK, Apr 26, 2007.

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  1. DaveK

    DaveK Guest

    Original Question
    Can anyone recommend a rotary switch, transistors, Ic's, or any
    component that may work for following situation?
    I have a circuit 4.5 vdc and 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
    any
    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
    space
    and would like to use the lowest profile component(s) possible. I
    have
    minimal experience with the different type of components, but have
    time and a willingness to learn.

    This was a reply that I received in regards to my original question
    avove. The problem is I;m not quite sure how to set the circuit up.
    Can anyone show it on a schematic? Is there a easyer or better way? If
    so, can you put it into a schematic? Thank you for your time

    Reply
    Use a 2 pole rotary switch to give you the combinations, and use
    diodes
    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.
     
  2. Momentary switches are just that, doing the work as long as you provide
    the "momentary" activation. So what you want to accomplish you need
    instructions from flute playing teacher who will teach you how to place
    your fingers on them.;^)
    For any other solutions you need memory to keep information that a
    switch is now active and is part of the cirquit. ( The toggle's solution
    looks like right idea).
    You have conflictic requirements, any single switch can do the work of
    all of them so why this redundancy?
    Define better the logic of what you need, will be easier to solve.
    HTH

    Stanislaw
     
  3. Greg Neill

    Greg Neill Guest

    Put a toggle switch in parallel with each momentary
    switch. To disable the action of any one momentary
    switch, close its paired toggle switch.
     
  4. DaveK

    DaveK Guest

    Stanislaw,

    The entire 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 anyone 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 space and would like to use the lowest profile component(s)
    possible. I have minimal experience with the different type of
    components, but have time and a willingness to learn.

    I will give you the benefit of doubt. You probably didn't get the
    entire original question that I asked. If you did I'm sure you would
    have answered it differently. Either way answering a question in this
    way;

    "So what you want to accomplish you need instructions from flute
    playing teacher who will teach you how to place your fingers on
    them.;^) For any other solutions you need memory to keep information
    that a switch is now active and is part of the cirquit."

    Would surely deter any new beginners in the world of electronics, that
    has so much to offer. Hope you can understand where I'm coming from.

    Dave K
     
  5. John Fields

    John Fields Guest

     
  6. In my mind I have a picture of something that decides in advance which
    of the possible combinations will perform the activation of the load.
    a) any single switch (which one?)
    b) two in series a&b; a&c; b&c (chosen in advance)
    c) all three at once.
    So you need a selector to configure/chose the working team from all
    those possibilities. I simple cannot imagine a circuit that will display
    those changing variations without external intervention.
    In electronics everything is possible, miracles take a little longer, so
    even to beginner we advise to define the performance of the finished
    product and "I want" is not a factor in this.

    Have fun

    Stanislaw.
     
  7. DaveK

    DaveK Guest

    Stanislaw,

    A mi didn't take to long for this gentelmen to come up with the
    correct answer, on his first try, with no further explanation. He was
    able to answer it from my original post even though the words "I want"
    were in my post.

    Below is the answer I was looking for:

    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.


    Ed
     
  8. DaveK

    DaveK Guest

    I'm sorry I did not get back to you when you first replied to my post.
    My post was answered shortly after. I should have let you know. I do
    value your replies and belive you have answered my posts in the past.
    Bellow is the answer I was looking for.

    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.


    Ed
     
  9. The moment you mention 'toggle' you incorporate mechanical memory into
    the circuit and it needs to be set in advance. In your description of "I
    want" somehow this part was _very_ weak.

    Good luck

    Stanislaw.
     
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