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Combined Audio Output

Discussion in 'The Garage' started by Chili, Jul 14, 2007.

  1. Chili

    Chili Mr. Fix-it

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    Nov 13, 2006
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    I want to combine the audio out put from my Garmin Zumo and my radar dectector and run them into my IPOD type ear pods. Both units have their own volume controls, and I am not concerned about a microphone out put.

    I am remembering something about it not being as simple as a "Y" connector.

    Is there a commercially available unit to do what I need?

    Or if someone can post a schematic of a diagram, I could make one up. :bow
    #1
  2. Rubber Cow

    Rubber Cow GS Dork

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    Yes, here's the unit
    http://www.tesseractcorp.com/
    As they point out on their site, Aerostich sells them as well.
    I run a Starcom intercom and can do the same mixing. Autocom will also do this. Both of these brands have a earbud option for the headsets.
    Cheers,
    Jorge
    #2
  3. Chili

    Chili Mr. Fix-it

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    Ah....I was thinking something cheap...no frills, no amplifier, no volume control, just a fancy "Y" connector...if that's possible.
    #3
  4. johnjen

    johnjen Now, even more NOW!…

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    If you don't isolate the outputs from each other you run the risk of damaging them. Outputs aren't meant to 'see' other voltages coming back at them. Isolation is often done with resistors, which lowers the output accordingly. Sometimes active electronics are used. Either way the signals need to be boosted back up. If your devices are either cheap or robust enough then the possible consequences of not isolating them (lack of reliability) is of minor importance.

    JJ
    #4
  5. Mac

    Mac Long timer

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    #5
  6. Chili

    Chili Mr. Fix-it

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    The Autocomm unit is the kind of thing I am looking for.


    I also found this discussion while looking for a DIY solution:

    http://www.tkk.fi/Misc/Electronics/circuits/linesum.html


    I hate to have my bank account drained by something as small as electrons, when there are cheap solutions out there. :dj
    #6
  7. Chili

    Chili Mr. Fix-it

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    Looks like about $5, maybe $10 to make one up out of my parts bin and whatever I need to buy. :thumb

    Now if it will only work!!!
    #7
  8. Rubber Cow

    Rubber Cow GS Dork

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    When you're done with that and need a DIY amplifier build yourself one of these:
    http://www.evilfire.com/altoids/
    A friend of mine and I did and it works great.
    Cheers,
    Jorge
    #8
  9. Chili

    Chili Mr. Fix-it

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    That's perfect, as I was considering using an Altoids box as a case for my project anyway. Just need to throw a few more parts into it.
    #9