impedance matching Transformers for audio

Discussion in 'CB Radio Forum' started by rabbiporkchop, Apr 13, 2016.

  1. rabbiporkchop

    rabbiporkchop Road Train Member

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    I'm eager to see how that truck turns out and what solution you arrive at. In regards to those Transformers I didn't expect you to find one that fit those specifications because I believe it was tailor-made for that particular microphone. That's why I'm so eager to learn the magical characteristics of this Transformer that makes it do what it does so I could possibly replicate it in the future. As soon as I can get some inductance measurements of the primary and secondary winding to jot down in my notebook I might get brave enough to open this thing up and unwind it to count the number of wraps
     
    Last edited: Apr 23, 2016
    Reason for edit: not ready to unwind it yet
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  3. rabbiporkchop

    rabbiporkchop Road Train Member

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    Found Rockwell Collins P/N: 677-0035-000
    The price is $213 directly from Rockwell Collins or $16 from Surplus sales in Nebraska.
    [​IMG]There's only 52 left in Nebraska which means once those are gone the price goes up to $213 each.
     
    Last edited: May 10, 2016
  4. mike5511

    mike5511 Road Train Member

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    Did you order one?
     
  5. rabbiporkchop

    rabbiporkchop Road Train Member

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    Not yet. I'm still looking at other options but I will definitely keep that one in mind.
    After purchasing them for $2.50 from Telex 16 bucks is a hard pill to swallow but I will if I have to
     
  6. mike5511

    mike5511 Road Train Member

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  7. rabbiporkchop

    rabbiporkchop Road Train Member

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    They don't make anything close. It must be a 1:2 turns ratio and
    150/600
    150 primary / 600 secondary.
    DC resistance through the primary 20 ohms.
    DC resistance through the secondary approximately 86 ohms or whatever it was I posted earlier in this thread.
     
  8. mike5511

    mike5511 Road Train Member

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    Wow! The shipping for one little transformer from Surplus Sales is $7!!
     
    rabbiporkchop Thanks this.
  9. rabbiporkchop

    rabbiporkchop Road Train Member

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    Civilian version available for $69.00.
    Pico part # G-29085
     
  10. rabbiporkchop

    rabbiporkchop Road Train Member

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    Surprised the transformer gurus neglected to mention that split primary and secondary windings can be connected for either 1:2 (150:600 S), 1:1 (600:600 S), or 2:1 (600:150 S) operation. Distortion, although specified for 600 S sources, will be further reduced by lower impedances.[​IMG]
    This increases our options.
     
    Last edited: May 11, 2016
  11. rabbiporkchop

    rabbiporkchop Road Train Member

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