Patchbay 101

Discussion in 'Patchbays' started by otherw, Sep 24, 2001.

  1. otherw

    otherw Guest

    I know this is basic, but. . . Can anyone descibe exactly how to integrate an unbalanced source (ie., Keyboard or Sound Module) into an otherwise balanced TT patchbay? I'm getting a few buzzes here and there, and I'm not sure which connections to lift or at which end. Thanks.
  2. erockerboy

    erockerboy Member

    Mar 16, 2001
    There seem to be two modes of thought on this question.

    Probably the "best" option is to convert unbalanced signals into balanced, by means of a balancing transformer or D.I. There are a bunch of products on the market that will do this kind of thing, or you can roll your own... just buy a bunch of Jensen instrument xfrmr's, wire 'em into a rack panel or two, and voila, you've got yourself a nice balancing network on the cheap.

    The quick n' dirty option is to tie the "cold" leg to ground on the output side. I've done this with different unbalanced pieces in my setup and it seems to work OK most of the time... altho every once in awhile you get the odd level drop or impedance mismatch kinda thing.

    I'm sure people with greater technical expertise will chime in as well... but those are your options as far as my drug-addled memory can recall. Good luck!
  3. otherw

    otherw Guest

    Thanks. Do you know a good source for the Jensens, local or otherwise? And which part number?
  4. anonymous

    anonymous Guests

    Feb 10, 2001
    Call Jensen, they're remarkably helpful with this sort of thing. They even have a "kit" so you can add "features" to your DI box.
  5. erockerboy

    erockerboy Member

    Mar 16, 2001
    Jensen parts should be fairly easy to find locally. I'll have to ask my tech guru where he gets his stuff. Meanwhile you can hit for more info.
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