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toroidal choke

Discussion in 'Electronic Basics' started by [email protected], Aug 18, 2007.

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  1. Guest

    How does a toroidal choke differ from an ordinary inductor? How do I
    use the rating to determine what frequencies it passes and what it
    filters out? Is there a good reference for this? A SAMS manual or
    something? I couldn't find much on the web.

    As a related issue, why are toroidal chokes common in cheap (but
    decent) surge suppressors, but the real fancy ones seem to include
    very large inductors.

  2. Charles

    Charles Guest

    A choke is a choke. It is an inductor.

    Torroids tend to be more compact and tend to not emit external fields.

    No magic ... they are inductors.

    The torroid core is a big issue ... and that is a book unto itself.

    Inductive reactance is 2*pi*f*L. One often chooses a choke with 10 times
    the inductive reactance (compared to the load resistance). That's just a
    low-level intro into this topic.

    Google for low-pass filters.
  3. Eeyore

    Eeyore Guest

    It tends to have less stray field.

    It difficult to make gapped cores with toroids though. Instead they tend to made
    with a variety of permeabilites.

  4. Phil Allison

    Phil Allison Guest


    ** The toroidal chokes seen in most line filters only reduce radio frequency
    energy travelling down the wires.

    Larger chokes ( likely made with gapped iron cores) will reduce much lower
    frequencies, down into the audio band for use with hi-fi systems.

    ....... Phil
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