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Shielded power-transformer

Discussion in 'Electronic Basics' started by Samuel Groner, Jun 24, 2004.

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  1. Hi

    I'm looking for a shielded (i.e. mu-metal) power-transformer (toroid).
    30 VA, 230-> 30 V. Any resources?

  2. John Larkin

    John Larkin Guest

    Properly-wound toroids leak very little magnetic field, and mu-metal
    is very expensive. What's this for?

  3. Properly-wound toroids leak very little magnetic field, and mu-metal
    Audio mixer. I have 4 cm between the transformer and the summing
    network - no way to change the layout. Would a 3 mm steel case around
    the transformer help much?
  4. John Larkin

    John Larkin Guest

    Probably not even 2:1. Thin sheet steel is fairly transparent to 60 Hz
    mag fields. Use a torroidal transformer and keep any loops in the
    mixer circuit down to minumum area, and keep the loops in the plane
    that has minimum coupling to the transformer, if you can determine
    that. Test the transformer to see if it leaks more at some point (like
    at the wire terminations) and orient that away from the tender stuff.

    You may need a grounded electrostatic shield - aluminum or copper will
    work fine, aluminum foil tape even - to kill capacitive hum pickup at
    these short distances.

    If this is line level stuff, you shouldn't have much trouble from
    magnetic coupling out of a torroid.

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