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SPDT Switch using N-JFETs

Discussion in 'General Electronics Discussion' started by Yoa01, Jan 27, 2013.

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  1. Yoa01

    Yoa01

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    0
    Jun 18, 2012
    Hi all,

    So I want to make a voltage-controlled SPDT switch using N-channel JFETs. I've tried every idea I can think of, save ditching the idea and using VCS ICs. In essence what I want it to do is use a square wave to switch between two inputs to a central output. It would also be cool if it were bi-directional; that is, switch one input between two outputs.

    And yes, I'm essentially try to do this, just differently.

    Thanks.
     
  2. GreenGiant

    GreenGiant

    842
    6
    Feb 9, 2012
    Why not just get an N-Channel and a P-Channel, that way it will switch when the voltage goes low and high without any other circuitry
     
  3. Yoa01

    Yoa01

    214
    0
    Jun 18, 2012
    That... that sounds pretty awesome! I'll have to wait for my p-channels to come in, but until then can you tell me how to connect the two to make them do that? I have literally no experience with p-channel JFETs.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,524
    2,655
    Nov 17, 2011
    Look at the interior circuit of an integrated analog switch. Or read this description (recommended).
     
  5. Yoa01

    Yoa01

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    0
    Jun 18, 2012
    Hm... that document was helpful, but it seems I either need MOSFETs or I'm just not looking hard enough! Sadly, it seems that just about every switch IC is see (lol) shows just a normal switch :(
     
  6. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    What is wrong with analog switch IC's?

    Bob
     
  7. Yoa01

    Yoa01

    214
    0
    Jun 18, 2012
    Oh nothing! I was just hoping to use parts I already have (and on the way from Futurlec). I mean if it gets right down to it I'm sure I can get the switch I need for, what, $.20? lol
     
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