On Thu, 20 Jun 2002, Tal Bejerano - AMC wrote:

>Hi to all
>
>Are they any basic rules for winding high frequency (100-500Khz) on toroids?
>I am starting building some psus' and the main problem is to wind the
>transformers. I found some info but not all consist, some say do like that
>and others take other approach. I am really confuse, are they really basic
>rules for that or most of it is trial and error?
>
>for example: I measure a small choke that I made with reading of 1mH even if
>I wind it closely or with spaces between the windings the reading is the
>same. that mean it doesn't matter if it closed wind or not?

It means your L-meter does not allow you to measure the Q and the self
resonant frequency of the choke.

Peter

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