Can anyone help me with winding a custom inductor/transformer.  The specs
are as follows:
   - Input = 29.38 uH, 31.35 mOhms
   - Output 1 = 0.75 ratio, 54.49 mOhms
   - Output 2 = 0.23 ratio, 7.64 mOhms
   - Output 3 = 0.75 ratio, 140 mOhms

Total power output = 20W, current at input winding should be 2A, and freq =
100kHz.

How do I go about this?  First, how do I pick a toroidal core, then the
wire, etc?

I have a link here (
http://members.tripod.com/~schematics/xform/xformer1.htm ) that explains how
to wind a custom transformer, but some parameters (like # of lines of flux)
seem arbitrary, and I feel like I need something more calculated).  Using
the sample lines of flux tells me my primary needs .031 turns of wire, etc.
Is there a way to determine lines of flux, or another to design this
transformer.

Cheers,
-Neil.




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