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Voltage/Length (fwd)
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From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Monday, February 09, 1998 2:57 PM
To: Tesla List
Subject: Re: Voltage/Length (fwd)
All,
I have to question this:
> From: Alfred A. Skrocki [SMTP:alfred.skrocki-at-cybernetworking-dot-com]
> Sent: Saturday, February 07, 1998 7:56 AM
> To: Tesla List
> Subject: Re: Voltage/Length (fwd)
>
> On Thursday, February 05, 1998 6:17 AM Greg Leyh
> [SMTP:lod-at-pacbell-dot-net] wrote;
>
> > John H. Couture wrote:
> >
> >
> > > It should be noted that using the equation
> > > Vs = Vp sqrt(Cp/Cs)
> > > can give incorrect results when applied to Tesla coils.
> > [snip]
> > > If the Cs is reduced in the above equation (reduce toroid size) with no
> > > other changes the Vs and sparks can be shown to be greatly increased. We
> > > know this is not true because it is contrary to tests of real coils.
>
> The above is wrong because it does not consider the fact that the
> equation Vs = Vp sqrt(Cp/Cs) refers to the distributed or parallel
> secondary capacitance. The toroidal capacitance is in SERIES with the
> secondary and actually decreases the total secondary capacitance and
> this is why adding a toroid usually increases a coils output.
>
> Ctotal = 1/(1/Csecondary + 1/Ctoroid)
If that is true, how do you explain the drop in resonant frequency of
the secondary if you add *any* topload at all? Think about it: if I
have 20pF and add 20pF in series with it, what is my total
capacitance? Why doesn't Fr *rise* when I add a topload?
Malcolm
<snip>