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Thread: Need to switch inputs when connecting 3.5mm jack

  1. #1
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    Need to switch inputs when connecting 3.5mm jack

    From an electrical standpoint I could do this no problem, but it's not appropriate for audio of course.

    Hopefully someone has a somewhat inexpensive solution for me.
    I don't have surrond this is for audio only and doesn't have to be absolutely perfect.

    So that said here we go:
    I have an aux in on my car stereo, 2 rca jacks (L/R) and right now I have something attached to it.

    I'm going to mount a 3.5mm jack somewhere in my truck so I can plug my phone or some random device into it.

    How can I cut off the existing device when I connect that 3.5mm jack?
    ==========================

    So when the 3.5mm jack is disconnected the existing "device 1" is connected to the aux jack.
    When 3.5mm jack in connected "device 1" is disconnected and the 3.5mm device is connected to aux.

    Thanks,

    Kenny

  2. #2
    MySQL Error soundman98's Avatar
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    how complex do you want?

    the easy solution is to use a manual switch with a dpdt relay-- combine the grounds for all the devices, and switch the left/right audio signals..


    otherwise, i used a amp box that had this a long time ago(it was a Niles Audio amp):
    look for a VOX circuit-- or a voice-activated relay:
    http://www.epanorama.net/phpBB3/view...st=0&sk=t&sd=a
    http://www.hobbytron.com/pdf/Vs1E.pdf

  3. #3
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    I was hoping to keep away from a physical switch but hey lol

    Let me see is my ever shrinking brain has the vox idea straight

    Take a DPDT relay
    common goes into stereo
    "device 1" L & R goes onto the NC ports.
    3.5mm goes into NO ports

    VOX-
    3.5mm L/R ALSO goes into mic port
    12V+ on one side of the vox, relay coil on the other.

    So when audio is picked up on the 3.5mm it activates the vox sending 12V to the relays coil?

  4. #4
    MySQL Error soundman98's Avatar
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    thats the way i understand it.

  5. #5
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    hmm actually no, I think a single channel would go to the vox, it's layed out for a mic signal/gnd the same as a single rca jack.
    one channel passing through the relay one not, might sound wierd but oh well I'll find out lol

    Thanks for the help oh great master *bow* :-p lol

    ---------- Post added at 08:44 PM ---------- Previous post was at 08:35 PM ----------

    Here we go even has a spot for my relay

    http://www.rainbowkits.com/kits/vox-1p.html

  6. #6
    MySQL Error soundman98's Avatar
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    whoops-- yeah, so you would need 2 of those kits for a stereo signal..

  7. #7
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    Well did a little more research thanks to your idea.

    If the switch in the jack does what it's supposed to do, should kick on the relay as soon as something is plugged in
    http://search.digikey.com/scripts/Dk...06837538115191

    http://search.digikey.com/scripts/Dk...06837538115191

  8. #8
    Raw Wave
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    Yeah - most 3.5mm jacks have a switch (usually to the ground/shield) which opens when the plug is inserted.

  9. #9
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    just hope the 12v doesn't hit my phone lol

  10. #10
    MySQL Error soundman98's Avatar
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    uh, the links say that the product is not found..

    is this the product # your talking about?

    CP-3524SJCT-ND

    according to the datasheet(link)

    the switch uses one of the positive leads of the connector--maybe oldspark has some ideas on correctly isolating the power/voltages?

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