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Unbalanced to Balanced ?

Discussion in 'Electronic Basics' started by Chris, Jul 11, 2005.

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  1. Chris

    Chris Guest

    My guitar pre-amp has no balanced output .
    The main amp I want to use only has a balanced input .
    Input instructions of the main amp say :
    Tip - hot .
    Ring - Return .
    Sleeve - Earth .

    I guess my only option is to connect the pair with a standard mono jack to
    jack .
    Tip - hot , Sleeve - Earth/Return .

    Will this be OK ?
    What am I going to lose out on ?


  2. Ban

    Ban Guest

    yep, you can try first like you said. But if there is a hum in the line
    because of some ground loop, it will be better to use a DI-box. This box
    contains a small transformer, so both amps are galvanically isolated.
  3. Bob Masta

    Bob Masta Guest

    Chris, are you sure the amp input instructions
    are really talking about a true balanced input,
    or maybe just a normal single-ended input
    with a separate shield? The shield would
    then be connected to ground at only one
    end to prevent ground loops.

    Best regards,

    Bob Masta

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

    Kitchen Man Guest

    I wouldn't do it that way. Connect tip-to-tip unbalanced-to-balanced,
    connect the sleeve of the preamp to the ring of the main, and leave
    the sleeve of the main floating at the preamp. Use shielded
    twisted-pair for the connection. As another poster mentioned, the
    best way is to use transformer isolation, but I think you don't have
    that option. If you tie "earth" and "return" together in the
    connecting wire, you will probably have a ground current loop, and
    hence, hum.
  5. Kitchen Man

    Kitchen Man Guest

    A clarification - you can use triax, if that's what you already have.
    The point is that you use a three-conductor transmission line. I
    don't think cable characteristic impedance will be a problem with your
    planned low frequencies and short runs.
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