Re: Foil wound pancake secondaries.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Gerry,
It is, but their talking about the capacitance of flat secondary's using 
very thin foil as the conductor. Kind of interesting, but I wouldn't want 
to be the one to wind it.

Take care,
Bart

Tesla list wrote:

>Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
>I would think that the self capacitance of the primary winding would be
>insignificant compared to the tank capacitance.
>
>Gerry R
>Ft Collins, CO
>
>
> > At the scrap yard, I came across a nice roll of 2 thou. thick 1 inch
> > wide copper strip,(0.05mm*25mm) and so a nice foil wound pancake
> > secondary would be possible to make.
> > I imagine that oil impregnated paper from cash registers would do as
> > insulation. Even with 2thou thick insulation it is possible to make a
> > 1000 turns coil that is only 8 inches (200mm)in diametre.
> > Drive it from the H.bridge and get some interesting results.
> >
> > I`m not sure I understand this right, but I imagine that the turn to
> > turn capacitance will be much greater in a coil like this, if so, how
> > will it affect the performance of the coil.
> >
> > Cheers, Finn
> >   the person who might best be able to advise you is Jeff Behary.
>He has
> > built several of these pancake coils.  maybe once rolled, entombing it in
> > wax or perhap some type of potting material would help.   as for the self
> > capacitance,  would that not just lower the resonant frequency?
>perhaps
> > using several layers of the paper would help lower the inter turn
> > capacitance a bit.
> > Mike
> >
> >
> >
>
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