Re: Magnifier conversion

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

Original poster: "Jolyon Vater Cox by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

I am wondering if it would be a good idea to surround the driver transformer
with a  grounded  metal cylinder  -with a slot cut one side to prevent
unwanted magnetic interaction- to provide the necessary capacitance.

I would also be interested to know if this geometry has potential
application in capacitive transformer-fed magnifiers -boosting the
capacitive coupling  between L1 and L2  in an manner analogous to the way
the "solonoidal-primary-solonoidal secondary" design boosts the magnetic
coupling in conventional magnifiers.

Jolyon


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, April 22, 2003 1:03 AM
Subject: Re: Magnifier conversion


 > Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
 >
 > Tesla list wrote:
 >  >
 >  > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 >
 >  > Lots going on this weekend but I did manage to build the primary coil.
 >  >
 >  > http://hot-streamer-dot-com/temp/NewMag/0420-01.jpg
 >
 > A magnific construction. I hope that it works well.
 >
 > I have been working in my magnifier too.
 > I have the driver built (not a beautiful as yours):
 > http://www.coe.ufrj.br/~acmq/tesla/mag345d.jpg
 > Primary: flat, 13 turns, diameters 8 cm and 13 cm, #18 wire.
 > Secondary: solenoid, 176 turns, diameter 7.4 cm, height 10.2 cm.
 > L1=53 mH, L2=3.95 mH, k=0.35 (calculated).
 > The connections are:
 > http://www.coe.ufrj.br/~acmq/tesla/mag345t.jpg
 > The small Leyden jar for C2 worked well in low-power tests. I am
 > still thinking in what kind of C2 I will use. The calculated value
 > is 69 pF. Experimentally, I measure that I need 45 pF. The
 > other 24 pF the structure already have. Medhurst's capacitances
 > for L2 and L3 (I assume that it's valid to consider this
 > capacitance when looking at L3 from the bottom) are 7.1 pF
 > and 5.6 pF. This leaves 11.3 pF for the interconnections.
 > I didn't measure the inductances yet, but the system worked
 > as expected, showing voltage waveforms corresponding closely to the
 > designed mode 3:4:5:
 > http://www.coe.ufrj.br/~acmq/tesla/mag345v1.jpg
 > http://www.coe.ufrj.br/~acmq/tesla/mag345v2.jpg
 > http://www.coe.ufrj.br/~acmq/tesla/mag345v3.jpg
 > The energy is being transferred in 6.15 us, in 2 cycles, as designed.
 > A problem is that I mixed turns with spacing between turns and ended
 > with one turn less in the primary, that should have 14 turns...
 > The system can still be tuned in this way, but with the minimum
 > capacitance that my variable top load can generate (C3=8.5 pF). At
 > least,
 > the output voltage will be the maximum that I can obtain.
 >
 > Antonio Carlos M. de Queiroz
 >
 >
 >