Re: TESLA COIL REVISED 2

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

Original poster: brent meyer <res095fx-at-verizon-dot-net> 

Aren't we talking about what basically amounts to a Tesla Magnifier here?

 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Fri, 02 Jan 2004 21:00:06 -0700
 > To: tesla-at-pupman-dot-com
 > Subject: TESLA COIL REVISED 2
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Fri, 2 Jan 2004 21:13:38 -0700
 >
 > Original poster: "Trans-world" <jaro-at-surfside-dot-net>
 >
 > Folks you don't have to take my word for it, that a 50-turn thick wire
 > secondary should work even for a small Tesla coil, here's what Tesla
 > had to say on the subject:
 >
 > "Here is a coil which is operated by currents vibrating with extreme
 > rapidity, obtained by disruptively discharging a Leyden jar. It would
 > not surprise a student were the lecturer to say that the secondary of
 > this coil consists of a small length of comparatively stout wire; it
 > would not surprise him were the lecturer to state that, in spite of
 > this, the coil is capable of giving any potential which the best
 > insulation of the turns is able to withstand; but although he may be
 > prepared, and even be indifferent as to the anticipated result, yet the
 > aspect of the discharge of the coil will surprise and interest him.
 > Every one is familiar with the discharge of an ordinary coil; it need
 > not be reproduced here. But, by way of contrast, here is a form of
 > discharge of a coil, the primary current of which is vibrating several
 > hundred thousand times per second. The discharge of an ordinary coil
 > appears as a simple line or band of light. The discharge of this coil
 > appears in the form of powerful brushes and luminous streams issuing
 > from all points of the two straight wires attached to the terminals of
 > the secondary (Fig. 1.) Now compare this phenomenon which you have just
 > witnessed with the discharge of a Holtz or Wimshurst machine -- that
 > other interesting appliance, so dear to the experimenter. What a
 > difference there is between these phenomena! "
 > http://www.pbs-dot-org/tesla/res/res_art05.html
 >
 > Note especially this part "in spite of this, the coil is capable of
 > giving ANY potential which the best insulation of the turns is able to
 > withstand".
 >
 > So according to that, "a small length of comparatively stout wire" is
 > capable of producing ANY potential/voltage which the best insulation
 > can handle. In other words, according to Tesla, a small number of turns
 > of a thick wire will provide ANY output voltage that the coil's
 > insulation can handle.
 >
 > Of course the limiting factor will be the resistance losses in the
 > secondary coil. And these losses aren't small because of the high
 > voltage as someone said, because Tesla wouldn't talk about using a
 > THICK (stout) wire, if a thin wire would also do the job.
 >
 > So, clearly then, using a THICK wire secondary coil will lower the
 > resistance losses enough, to allow more powerful resonance which will
 > build up output voltage to any level. The only problem with a small
 > 50-turn 12" diam secondary, would then be its very high frequency (in
 > the MHz range).
 >
 > The third, tertiary coil is then used to reduce the coil's resonance
 > from MHz range to several hundred kHz. And that's what I propose for a
 > small Tesla coil. 1-turn primary, 30-50 turn secondary of a thick 8 ga.
 > wire on 12" diam., and a tertiary coil made of 100-200 turns of 20 ga.
 > wire on a 1" diam core. Also, in order to compensate for the added
 > resistance of the tertiary coil, Litz wire may be needed for the
 > primary loop.
 >
 > That should provide as high output voltage as a 1000-turn Tesla coil,
 > but at several times higher frequency (about 300kHz+).
 >
 > Jaro
 >
 > --- Tesla list <tesla-at-pupman-dot-com> wrote: