On 5/11/07, Gerhard Fiedler <lists@connectionbrazil.com> wrote:
>
> David Bengtson wrote:
>
> > It really depends on whether you plan to make a bunch of these or if you
> > are just making one. If you are just making one, I'd suggest a sample
> > kit of inductors as the easiest thing to do.
>
> I'm planning on making a bunch of these, but I still am tending towards
> the
> kit of inductors, for the reasons you (and Peter) mentioned.
>
> > The other problem with PCB Coils in production is that if you get in a
> > new batch of PCB material, your inductance could well shift, since the
> > inductance is dependent on the board dielectric constant.
>
> I thought that PCB coils would give me good repeatability, at least after
> it has been adjusted, and for free in production, but I didn't think of
> this. I guess it's not what I want, after all... :)
>
> Well, you might want to look at the numbers before you come to a final
> decision. it may be that you can live with the shift you'll get from
> changing board material. There are a lot of different way's to calculate the
> inductance you'll get, try plugging in different dielectric's to see what
> happens.


Dave
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