Audio transformer

Discussion in 'General Electronics Chat' started by crivoli, May 6, 2006.

  1. crivoli

    Thread Starter Member

    May 4, 2006
    26
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  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    You're stuck with the transformer as is. All the tech specs part of the Shack site tells you is that it weighs 1.9 pounds.

    It's a four to one ratio you're looking for, by the way. Avoid the Shack in the future and buy parts from outfits that actually publish specs.
     
  3. n9xv

    Senior Member

    Jan 18, 2005
    329
    1
    The Rat Shack transformer is a 1-Kohm to 8-ohm audio transformer. If you need a 32-ohm load, you can connect 8 4-ohm speakers in series or 4 8-ohm speakers in series or 2 16-ohm speakers in series. 32-ohms sounds like typicall personal stereo output impedance. Care to elaborate?
     
  4. crivoli

    Thread Starter Member

    May 4, 2006
    26
    0
    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 these links 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?


    http://www.cpcares.com/xicon/Xicon_EI_19_A...mers/index.html

    http://www.mouser.com/?Ne=100&handler=data...category&N=4204

    Thanks again
    -newb
     
  5. n9xv

    Senior Member

    Jan 18, 2005
    329
    1
    The "ratio" is the impedance ratio. In other words, if you want to convert 8-ohms to 32-ohms (or vice versa) then you need an audio transformer with an impedance ratio of 4:1 (32-ohms : 8-ohms) since 32 / 8 = 4. I dont think you'll find a transformer for that specific impedance ratio. Audio transformers are designed for standardized impedance levels like 25-Kohm, 2-Kohm, 600-ohm etc. Can you elaborate on what exactly it is you trying to acheive? There may be another way.
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
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