Audio transformer

Discussion in 'The Projects Forum' started by crivoli, May 6, 2006.

  1. crivoli

    Thread Starter Member

    May 4, 2006
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  2. thingmaker3

    Retired Moderator

    May 16, 2005
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  3. crivoli

    Thread Starter Member

    May 4, 2006
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    Thanks for the response.

    Here are the specs of the transformer I bought:

    impedance: 1kHz, 1V, 0mADC
    input: 1k ohm+- 10%
    Output: 8 ohms (loaded)
    DC resistance (input): 70 ohms +-20%
    DC resistance (outout): .62 ohms +-20%
    Frequency response: 300-10000Hz +- 3db
    Insulation response: more than 100M ohms @250VDC


    I looked at the links you provided but I don't know enough about the transformers to even pick one out to buy that would be a 1:3 ratio...... any suggestions on which to buy and how to tell the ratio?

    Thanks again
    -newb
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    Excuse me, but the ratio of 8 ohms to 32 ohms is actually 1:4 and not 1:3
     
  5. crivoli

    Thread Starter Member

    May 4, 2006
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    So, Papabravo.... can you suggest a transformer that is 1:4? Any specific brand or model you prefer?

    Thanks
     
  6. Papabravo

    Expert

    Feb 24, 2006
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    I've never had any occasion to use one so I'm in no position to make a recommendation. I suppose you could find a toroid and some magnet wire and make your own. Challenging, but not impossible. A company called Amidon makes toroids for RF applications; they just might have ones designed for audio.
     
  7. legac

    Well-Known Member

    May 4, 2005
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  8. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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    Quite correct. One of these days I need to learn how to tpye.

    Crivoli, is this for your intercom? If so, you'll need a trafo with an ouput impedence of 8Ω and an input impedence of somewhere between 25 and 120 Ω.
     
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