Re: Flat Coil Concept

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

Original poster: "Cory Roussel by way of Terry Fritz <twftesla-at-qwest-dot-net>" <imcuddlycory-at-yahoo-dot-com>

Hey,

hmm that makes sense thanks for the answer..., so
actually with the right kind of setup you could make a
multiple megahurtz coil if you had the right kind of
stuff... i dont know why ude want to... perhaps for
some remote powering experiments, suspend the
secondary 25ft from the primary and fire it......
hmm...


just thinkin,

Cory Roussel
G1 G1206

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <Mddeming-at-aol-dot-com>
> 
> In a message dated 3/8/02 8:23:35 PM Eastern
> Standard Time, tesla-at-pupman-dot-com
> writes:
> 
> 
> >
> > ??  Also, Is there really any
> > special frequency that tesla coils operate best at
> or
> > is it just that 200khz is a nice frequency to
> transfer
> > energy to the secondary???
> >
> > thanks
> >
> > Cory Roussel
> > G1 Geek# 1206  
> >
> >
> 
> 
> 
> Hi Cory,
>          In an ideal Tesla coil system, it is
> necessary that L1C1=L2C2. Because
> f=1/(2pi*sqrt(LC)) frequencies much above 300 KHz or
> much below 100KHz require
> components that are inconveniently large or 
> inconveniently small. If the
> primary cap (C1) is too small, it doesn't store much
> energy and the primary
> coil (L1) becomes unwieldy. Too small a primary coil
> results in larger power
> losses in the gap, and needs a capacitor that
> requires too much power to charge
> it up in a reasonable length of time. A manageable
> size secondary has a certain
> inductance (L2) which must balance with a reasonable
> sized topload
> (Cself+Ctop=C2).
>          Since, for a standard secondary,
> L=(rN)^2/(9r+10h), where r is the
> radius, N is the number of turns, and h is the
> height,  and for a spiral coil,
> L=(RN)^2/(8R+11B), where R is the average radius and
> B is the width (r inner-r
> outer) putting in reasonable sized numbers results
> in frequencies close to this
> range. 
>          It is also very nice if your coil puts out
> most of its energy below
> the commercial AM radio frequencies
> (~540KHz-1600KHz) and especially staying
> away from 455KHz. Play some what-if games with the
> tesla design programs, or
> even with the simple equations above (ie do the
> math) and you'll see why most
> coils are in this range.
> 
> Matt D.
> G3-1085
> 
> 


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