Re: the dc saturation controlled variable inductor Low power inductor, receive antenna signals.
I've decided to try an EFD shape core, reasoning for the choice; I can turn one side 180*, the center leg over lap area is reduced to 14%. My theory is, that reduce area will saturate at lower flux.
Is that reasonable?
I don't have a lot of material choices. TDK material Available materials, N87 and N97 Material data here
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Fair-rite Available material, 78 Material data here
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Which of those materials will work from 500kHz to 4MHz as a 100uh inductor?
If you would like to educate me, Does the permeability curve relate to how well a material will perform as an inductor over frequency?
Or, ask another way, For a given material Does AsubL fall off as frequency increases like it's permeability curve?
Thanks, Mikek