Re: TESLA COIL REVISED

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

Original poster: dhmccauley-at-spacecatlighting-dot-com 


Jaro,

You have a number of errors in your statements.

Firstly, the classic tesla coil's output voltage is created through the
resonant rise of voltage on the secondary coil.
And it is, as you stated have a ideal gain related to the sqrt (Ls/Lp) or
sqrt (Cp/Cs).

Secondly, your statements regarding solid state tesla coils are incorrect as
well.  A 50-turn secondary on a solid state
tesla coil would yield extremely poor results.  I have built a large number
of solid state tesla coils (>20) and have experimented with
many different sizes of secondaries, number of primary turns and secondary
turns.  I've also built solid state tesla coils ranging in
frequencies from about 45kHz up to 10MHz+.  Best performance always occurred
with a secondary with about 1000-1200 turns.
For longest output arcs, frequency ranges of 45kHz to 250kHz seemed to work
best and for cleanest CW brush-like discharges for
audio modulation started at about 300kHz (still considerable corona noise)
and at about 3MHz became completely silent.  Beyond 5MHz,
magical things start occuring with the output arc and the brush like
discharge starts becoming more and more like a candle flame, although I
haven't
been able to build a reliable solid state coil to operate at frequencies
above 3MHz just yet.

As others suggested before, instead of throwing around all this theory and
ideas, I would suggest as well that you start building some coils for
yourself and
see the results firsthand.

Dan



 > Now, since the output voltage of CLASSIC TC depends on the L2/L1 ratio
 > instead of a resonant rise, this design wouldn't be good for classic TC
 > because the output voltage would be rather low. BUT, it WOULD be
 > perfect for a SOLID-STATE Tesla coil, because this coil produces
 > RESONANT RISE (as you yourself mentioned).
 >
 > So now that we know that a 50-turn secondary doesn't have higher losses
 > than a 1000-turn one, even though it resonates at much higher frequency
 > (several MHz), we can see that the 50-turn secondary is a superior
 > design when used in SOLID-STATE Tesla Coils.
 >
 > And that's because while the output voltage of 1000-turn coils is
 > limited by the L2/L1 ratio, the 50-turn solid-state TC has no such
 > limitations, and will build up the output voltage to ANY LEVEL that the
 > insulation will allow.
 >
 > Of course the higher frequency will result in shorter sparks, so this
 > coil would be more for people who want to experiment with very high
 > frequencies and perhaps experience beams or walls of light (brush-like
 > discharge), instead of the sparks. And that brush-like discharge would
 > probably be more plasma-like than the usual low-frequency sparks.
 >
 > Jaro
 >
 >  >
 >  >Regards, Gary Lau
 >  >MA, USA
 >  ><snip>
 >  >
 >  >
 >  >---
 >
 >
 >
 >
 >