Tal,

Depends on what you are trying to do.  General rule is to wind with the
turns evenly distributed around the toroid.  Keep in mind that at 500kHz
wire larger than 30 AWG (0.28mm dia.) will exhibit enough skin effect
that you might want to start considering bifilar/polyfilar windings.
Regards,

Dave

Tal Bejerano - AMC wrote:
>
> Hi to all
>
> Are they any basic rules for winding high frequency (100-500Khz) on toroids?

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