Re: [TCML] Photos of my coil.

[DC Cox <resonance@xxxxxxxxxxxx>]

Are you using a Terry filter to protect your transformer from the nasty
kickbacks?  You have to keep the RF currents out of the sec winding of the
power xmfr.

It's also important to be sure the value of your cap bank does not form a
resonance with your transformer.  The value of capacitive reactance should
be about 1.3 to 1.4 times the impedence value of the neon transformer.  This
is usually controlled by calculating the transformer's effective impedence,
and then making the number of caps in series such that the capacitive
reactance is higher than that of the transformer.  If the impedence is
perfectly matched, a harmful resonance may occur.

If not, please advise off-list and I will email you the schematic with
info.  I think it's also buried somewhere in the archives.

Dr. Resonance

On Sat, Aug 8, 2009 at 10:37 PM, austin feathers <kartkid1@xxxxxxxxx> wrote:

> Hey all! It's Austin. Heres my flikr account, along with photos of the coil
> I'm constructing. I'm an aspiring coiler and would very much welcome any
> critical observations or queries as to the design and how it may be
> improved.
>
> http://www.flickr.com/photos/thedangerousnerd/sets/72157621985544942/
>
> Also, I've been pondering the death of my first 15Kv 30 milliamp
> Franceformer neon sign transformer. I'll admit that I didnt have the terry
> filter grounded, but the autopsy (trying to draw an arc from either pole)
> revealed that either the primary was done for, or that both secondary
> windings failed, in that if one of the secondary coils were intact, I
> should
> (?) be able to get 7,500v from a surviving pole to the transformer case.
> Any idea what happened, or what I might do to protect a new transformer?
>
> Thanks!
>
> Austin
>
> P.S. I'm looking to procure anywhere from a 10-25 amp variac for main
> voltage controll, as well as a 15Kv 60milliamp NST. Should I just throw
> money at it? Or do you guys have some kindof high-voltage fairy that stops
> by with loads of surplus components...
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