Re: Proposed capacitive transformer TC?

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

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

Antonio,
Sorry but the amended schematic you posted appears garbled -perhaps
alignment on different on my computer is to that on your machine?

Also http://www.coe.ufrj.br/~acmq/tesla/mres4hp.jpg
and
http://www.coe.ufrj.br/~acmq/tesla/mres4hp1.jpg
appear to be missing from your website.

Sorry for any inconvenience- hope to read these soon,
Jolyon


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, August 05, 2002 3:27 AM
Subject: Re: Proposed capacitive transformer TC?


> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
> Tesla list wrote:
> >
> > Original poster: "Jolyon Vater Cox by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
> >
> > Here is the schematic in the correct font (Courier New)
> > -I hope it comes out correctly this time!
> >
> >                                 (=+=)
> >                                   |
> >                                   L2
> >                                   L2
> > ---------+------L1------+-----)   L2   (  EIP1
>            |              |         L2
> > PSU     SG1             C1        L2
> >          |              |         |
> > ---------+--------------+---------+----GND
>
> Still misaligned. I corrected the alignment. Can you see it?
> "|" makes a better vertical line than "I".
>
> > Description:
> > The electric induction plane EIP1 is a metal plate with
> > hole in the middle wide enough for L2 to stand within the
> > enclosed space without touching; it is
> > connected to L1, C1 and SG1 the spark gap, it  not
> > connected to L2 the secondary coil other than by
> > capacitive coupling.
> > L2 is grounded at one end and connected to a toroid at
> > the other.
>
> I built a more elaborated version:
> http://www.coe.ufrj.br/~acmq/tesla/mres4hp.jpg
> L1 is the large red inductor. C1 is the tube at its right side.
> The NST is missing in the picture, and also an insulator below L1.
> I made a wood disk with a large hole and glued a strip of aluminum
> foil over it, interrupted to not form a loop. It is insulated
> from the ground with three glass pots.
> A low-power test shows that it works in mode 20-21. Vc1
> shows 10.5 cycles before the first notch:
> http://www.coe.ufrj.br/~acmq/tesla/mres4hp1.jpg
> Faster modes are possible by rising the induction plane,
> but eventually it would work as a strike rail.
> I didn't test it at high power yet, but it will surely work, if
> sparks don't appear between L2 and the ring, and the aluminum
> foil supports the current.
>
> I am really liking the antenna at the terminal for tuning. Much
> easier than changing L1, and allows very fine tuning.
>
> > An interesting feature is that it is an
> > "indirectly-coupled" system. Also it seems to me that
> > if EIP1 were driven by RF generator the system would
> > essentially become a Magnifier but with the RF connection
> > to the bottom of extra coil and the ground plane
> > interchanged ie.L2 the "extra" is directly connected to
> > ground and RF is applied to the plane -the opposite to
> > the usual Magnifier configuration.
>
> You are right. A magnifier version is surely possible, but too
> much voltage at the induction ring would require a different
> construction. A smooth toroid with a large hole, for example.
>
> > The same would result with the spark-gap excited circuit
> > if the positions of L1 and C1 were interchanged.
>
> Really, in the schematic above, L1 and C1 can be interchanged.
> The connection is then safer. With C1 grounded the NST is
> directly connected to the induction plane.
>
> > Is this reasoning correct-only it seems to me that in a Magnifier the
> > question of whether or not HV RF was supplied to the base of the extra
coil
> > with the planar electrode grounded OR the the base of the extra coil was
> > grounded and HV RF to supplied the planar electrode would not matter
much,
> > electrically speaking.
>
> Surely. A problem with these capacitively coupled structures is that
> the grounded final resonator has capacitance to the ground too.
> Without some form of compensation, this reduces the effective
> coupling, and forces operation at a slower mode.
>
> Antonio Carlos M. de Queiroz
>
>
>
>