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Making three-way audio switch

Discussion in 'Electronic Basics' started by Zed Rafi, Jan 12, 2006.

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  1. Zed Rafi

    Zed Rafi Guest

    Hello all,

    This is my first post in this group.

    I want to make an audio input switch for my stero system at home.

    My sound system only has a single AUX input, although I've got a number of
    devices that i want selectively amplified through my sound system. I'm
    currently unplugging/replugging RCA wires, and i'm getting tired of it.

    I was originally planning on simply buying 3 pairs of RCA connectors
    (input1, input2, output) and connecting them to a three-way (on-off-on)
    switch which could connect the output selectively to input1 or input2
    depeding on its position.

    But i am wondering how difficult it would be to make a small circuit capable
    of detecting current in both inputs and just outputting whatever input has a
    non-zero value, without losing any quality in the audio signal.

    If both inputs have a non-zero value, it would just light up a LED to
    notify me that both inputs are receiving signals at the same time, and that
    i need to shut one of them off.

    Any thoughts or links to web pages? I'm pretty new to designing my own elec
    circuits. I know what most electronic components do, but don't known how to
    select them and how to arrange them to make what i want.

    thanks for your help
  2. Bob Masta

    Bob Masta Guest

    What you ask is "sorta" possible, but the devil is in the details.
    Building the basic device to switch lines based upon some detected
    level is not the problem. The problems come when you consider
    that you will need to have some switch threshold, so you don't
    trigger on random noise. But invariably there will be program
    material that goes below this threshold, even just momentarily.
    So then you have to start messing with various delays. I'd rate
    the odds of getting a satisfactory system as pretty low, not worth
    the effort.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Home of DaqGen, the FREEWARE signal generator
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