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Toroid core types by color ID?

Discussion in 'Datasheets, Manuals and Component Identification' started by FuZZ1L0G1C, May 20, 2019.

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  1. FuZZ1L0G1C


    Mar 25, 2014
    Hi. What does the color signify on toroidal cores?
    As most articles I've seen so far don't list this specifically, but do mention certain cores such as compressed ferrite having different magnetic permeabilities between the material types.
    So I wonder if color = "core material" code?
    At first I thought it was frequency range application, such as for LF mains power, audio, RF, etc.
    However, this would be too broad-spectrum for selecting a specific value.
    For example, I have several dozen cores of varying sizes, cross-sectional shapes and colors floating around at home, some from components bought long ago for un-built projects, other stripped from old equipment.
    Thanks. Clive.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    As far as I know color is not used for coding any particular property of toroidal cores.


    May 20, 2017
    Some do. I still have some colour coded cores. Unfortunately I can't remember who the manufacturer is / was. If I do, I will come back.
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