Transformer for Balanced to Unbalanced Audio?

Discussion in 'The Projects Forum' started by johnyradio, May 26, 2014.

  1. johnyradio

    Thread Starter Member

    Oct 26, 2012
    39
    1
    Hi

    Thanks for your AWESOME website! I have a tech question. I cannot tell if you have a forum, so I'm sending the question here.

    I have a piece of audio gear with balanced outputs, and i need to send it to gear with UNbalanced inputs.

    I want to build the balanced to unbalanced adapter from:
    http://www.rane.com/note110.html
    (scroll down to "The Next Best Right Way To Do It")

    Here's my question. Would any of the transformers below work for this purpose?

    http://r.ebay.com/CWd0TA
    http://r.ebay.com/yRsln2
    http://r.ebay.com/Ga5xaI
    http://r.ebay.com/k9tGkA
    http://r.ebay.com/L0xB4e
    http://r.ebay.com/TWNtAW
    http://r.ebay.com/BmtLRp
    http://r.ebay.com/JAlJO0
    http://r.ebay.com/SgrWzs

    -Thx for helping a noob!
     
  2. Experimentonomen

    Member

    Feb 16, 2011
    331
    46
    Is the galvanic isolation a requirement ? If not just use an opamp as per the balanced line receiver project on elliot sound products website.
     
  3. johnyradio

    Thread Starter Member

    Oct 26, 2012
    39
    1
    i like the transformer method because it's simple, passive (no power needed), and Rane says it's the quietest.
     
  4. Experimentonomen

    Member

    Feb 16, 2011
    331
    46
    Atleast i can say that none of those transformers you posted are suitable.

    Your looking more at like the transformers lundahl sells, which are transformers made specifically for audio.

    You will find that at the end of the day, the opamp version is alot cheaper.
     
  5. johnyradio

    Thread Starter Member

    Oct 26, 2012
    39
    1
    i'm sure you're right. But for my purposes, i don't want to include any pcb stuff. A transformer seems to lend itself better to old fashioned point-to-point wiring.

    Can you say specifically why these transformers would not work?

    One of the transformers i linked is called an "audio" transformer. http://r.ebay.com/yRsln2 Why is that one incorrect?

    thx!
     
  6. #12

    Expert

    Nov 30, 2010
    16,355
    6,852
    The specifications posted are false and inadequate. According to the seller, the DC resistance is the audio frequency impedance (false) and it has no frequency range.
    You shouldn't bet money on a part that has no valid specifications.

    You're looking for something in the audio range with about 600 ohms to 10k ohms impedance ratio. The cheapest one I can find costs $51 plus shipping...which suddenly explains why people would use a 59 cent op-amp with a gain of 16&2/3rds.
     
    Last edited: May 26, 2014
  7. eetech00

    Active Member

    Jun 8, 2013
    652
    112
    Here's one designed for balance to unbalanced audio applications.

    But its also pricey...~$60

    eT
     
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