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3.5 mm -> XLR adaptor?

Discussion in 'Hobby Electronics' started by Zyxak, Dec 26, 2005.

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  1. Zyxak

    Zyxak Guest

    I want to make an adaptor cable which has a 3.5 mm stereo plug on one
    end and a male XLR plug on the other end.

    The XLR socket (which the cable will plug into) is a microphone input
    and I want to be able to connect a CD/mp3 player to it via the adaptor
    cable.

    So, how do I wire it? And, do I need to include any components? I know
    most microphones are between 100 - 600 ohm and speaker outputs are much
    lower like 8 or 16 ohm. Will I need to add a resistor or whatever to
    match the mp3 player to mic. input?

    TIA

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  2. swanny

    swanny Guest

    XLR pin 1 is ground, pin2 is hot, pin 3 is cold.

    The XLR input is a mono signal, so you will need to use 2 inputs to
    connect the stereo output of the CD/MP3 player, each with an XLR
    connector. One XLR connector is wired to the 3.5mm plug tip, the other
    to the ring. The sleeve of the 3.5mm plug is ground.

    Since you won't be using balanced inputs, connect the cold pin of the
    XLR to the ground pin.

    The you will need to adjust your input trim to handle the line output
    from the CD player without overloading the input.
     
  3. Guest



    I would think that only one XLR plug would be needed if the amp is only
    mono.
    Connect a 100 ohm (not sure about the value) resistor in series with
    the tip and ring of the 3.5mm stereo plug.
    Join the resistors together and connect to pin 2 in the XLR plug.



    And as Swanny wrote, connect pin 3 to ground.

    Russell Griffiths.
     
  4. Zyxak

    Zyxak Guest



    I would think that only one XLR plug would be needed if the amp is only
    mono.
    Connect a 100 ohm (not sure about the value) resistor in series with
    the tip and ring of the 3.5mm stereo plug.
    Join the resistors together and connect to pin 2 in the XLR plug.



    And as Swanny wrote, connect pin 3 to ground.

    Russell Griffiths.
    [/QUOTE]
    I'm using a 3.5 mm stereo phono plug - tip/ring/sleeve. Do I run tip
    and ring (L and R channels) together into one resistor or a resistor on
    each then connect the resistors to pin 2? When you say "
    not sure about the value" do you mean power rating? What would you suggest?

    Does the sleeve connect directly to ground?

    One last thing, on closer inspection I find that the XLR socket I want
    to connect to has 5 connectors not the standard 3. From various sources
    I found through google I see that pins 1, 2 and 3 are still used for the
    same connections for a microphone. Yes?

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  5. Guest

    Thanks for answering those questions Jasen, you saw them long before I
    did.

    Russell.
     
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