On 30/07/2013 18:51, veegee wrote:
> The local electronics surplus store sells a few standard ferrite toroid
> cores made of either #43, #61, or #75 material. I looked at the
> following randomly-googled chart for remarks about each of those
> materials: 193.6.189.120/letoltes/HG0MAT/toroid_datasheet.pdf

For more specific and useful charts, see the Fair-Rite website:

http://www.fair-rite.com/newfair/materials.htm

David
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