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gkzhang

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Posts posted by gkzhang

  1. I am an electronics n00b.  Even more than that.  I only know what I learn from school.  I have a problem.  And to that problem I made a solution.  But I have no freaking idea how to implement the solution. 

    Basically here is the source of my problem.  I am running both linux and windows at the same time.  I recently purchased a new sound card.  However, though it has windows drivers, linux does not yet support the sound card.  So I am thinking about using my soundcard that is built in to the motherboard.  So the actual problem is, I have two soundcards and one speaker output.  I need something that can detect an audio input and select which one is active and use that signal and send it to the speakers.  That part I knew how to do.  I learned it in class.  I built up a truth table and did all this fancy smancy DeMorgan's stuff and built a circuit like I was taught.  I have a circuit but I have basically no freaking clue on how to actually build it using real world stuff. 

    Included is an image of what I have so far.  Basically I have two inputs A and B.  A is my preferred sound card and B is my onboard crap sound card.  X is the desired output.  1 signifies an active signal and 0 signifies no signal.  Here is a truth table and image.

    circuit.jpg


    A    B    |    X
    -----------------------
    0      0    |    A
    0      1    |    B
    1      0    |    A
    1      1    |    A

    I built a truth expression of A or NotB.  The output of this expression is to be feeded into a multiplexer that can select which to output.  A and B are both inputs for the multiplexer as well.  Tell me if you see any flaw in my work so far. 

    But basically, what does a real multiplexer look like?  Is it just a chip?  I am guessing so.  But I want my device to be a small box.  So would I have to have 3 chips?  One for the Not gate, One for the Multiplexer, and One for the Or gate?  I guess I have to buy the inputs and outputs of the audio plug things.  I am guessing I need a plastic box that this would all fit in.  Would I need to build my own or is there some sort of universal box that can hold stuff?  Also I need a power source, I am guessing this takes a small amount of power so how long would a bios type battery or AAA battery last?  Basically, what would I have to buy?  Thanks for your help.

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