I need to find an inductor 500mH-700mH for use in an audio filter,
up to about 10kHz

None of my regular suppliers has any inductors that go that high.
According to info on the web, it should be possible to use a small
transformer

I have quite a few of these, envulturated from SMPS etc, but they
have VA or impedance rather than inductance ratings, or have just
a part number, so I need to find out for myself if a primary or secondary
winding will be suitable

Is this method going to do what I need ?

http://et.nmsu.edu/~etti/fall96/electronics/induct/induct.html

BTW, what is "a known resistance R between 100 S and 1 KS" ?

A typo for omega ?

TIA

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