Re: Magnifier questions

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

Original poster: humanb-at-chaoticuniverse-dot-com 

Hi, I have used a tert/sec inductance ratio of 4-5/1,
and wrapped the entire secondary in 30 mil LDPE for a
thickness of 3/4". Then wrap the primary directly over
that for >.4K coupling that stands off 15KV pri. Good
quenching gap a must. And Yes, tune for the "Free
Resonator", but I think it is still lumped, and
remember to use vary high C for the terminal. I like
Magies because the buisness end can be put just about
anywhere.

Regards,

David Trimmell

On Sun, 26 Oct 2003 22:22:55 -0700, "Tesla list" wrote:

 >
 > Original poster: "J. B. Weazle McCreath"
 > <weazle-at-hurontel.on.ca>
 >
 >
 > Hello Coilers,
 >
 > As a winter project I'm going to tackle building a
 > small magnifier type
 > of Tesla coil.  I have a hard time with math and
 > complex formulas, so I
 > want some "laymans" advice on a few aspects of
 > magnifier construction.
 >
 > Here's what I do know:  1) The "extra coil" can have a
 > high inductance
 > and a larger than normal top load.  2) The secondary
is
 > tightly coupled
 > to the primary, which is in the helical form rather
 > than a flat spiral.
 > 3) The secondary is not resonant, but rather works
more
 > like a step up
 > transformer, mainly due to the high coupling.
 >
 > Now the questions:  1) Is the primary's resonant
 > frequency the same as
 > that of the "extra coil's"? {I suspect that it is}  2)
 > Is there a rough
 > ballpark figure as to the turns ratio between the
 > primary and secondary
 > of the driver?  3) How much does the secondary effect
 > the frequency of
 > the "extra coil", as I would think it would lower it
to
 > some degree?
 >
 > I've gleaned most of what I know on magnifiers from
 > Hull's guide to the
 > CSN and from searching the list's database, but I'm
 > still in the dark.
 > Any and all advice would be appreciated, but please
 > keep the math to a
 > minimum.  By the way, I use WinTesla to calculate the
 > ballpark figures
 > for the "extra coil" and topload, as well as the
 > primary.
 >
 > 73, Weazle, VE3EAR/VE3WZL
 >
 > Details of my "Hyperbaric Gap" and Tesla coil are at:
 > http://www.hurontel.on.ca/~weazle