Re: [TCML] tcml primary self c

[Jeremy Scott <supertux1@xxxxxxxxx>]

I built a primary out of two strips of brass ribbon and one strip of copper in between and it was really bad, not to mention very expensive. 

It worked but it was difficult to tune and the output wasn't that great. You also have more to worry about with turn to turn arcing. I didn't see any corona but I'm sure a time exposure would have shown a lot and I didn't think of that at the time. I'll post a picture later when I am at home. Maybe if you encase the whole thing in epoxy will you get rid of the corona but good luck tuning it. :)

--- On Mon, 7/28/08, DC Cox <resonance@xxxxxxxxxxxx> wrote:

> From: DC Cox <resonance@xxxxxxxxxxxx>
> Subject: Re: [TCML] tcml primary self c
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Monday, July 28, 2008, 9:44 PM
> No myth here --- I am sticking to the facts. Physics is
> physics and it
> doesn't change.
> 
> If you look at some photos of Wysock's earlier coils
> using copper ribbon you
> see a generous amount of corona off the sharp edges.
> 
> I also experienced this in photos I shot.
> 
> My advise is:  if you are running a coil with ribbon shoot
> your own photos
> and check for corona.  Make your own determination.  But,
> if you are
> designing from scratch, why not use good engineering
> practice in the first
> place?
> 
> Anytime you run a coil at 200-400 kV (or more) and put a
> sharp edge near the
> secondary (12-24" away), it will definitely produce
> corona.  Just do the
> physics or look at some electrostatic plots of ribbon coils
> and you will see
> what I mean.
> 
> I urge future coil builders to use copper tubing ---
> it's rounded edges help
> retard corona.  A better solution than burying your head in
> the sand and
> pretend the corona doesn't exist.
> 
> Dr. Resonance
> 
> On Mon, Jul 28, 2008 at 6:39 PM,
> <dr.hankenstein@xxxxxxxxxxxxx> wrote:
> 
> > I agree with Finn. Here is a long time exposure taken
> at 1600ASA of a small
> > coil with a flat ribbon primary:
> >
> http://www.audiotesla.org/images/Corona%20Experiment/DSC_0155.JPG
>  I don't
> > see any evidence of the ribbon causing corona worth
> worrying about. I am
> > using "high voltage buss" on my larger coil.
> The difference between high
> > voltage buss and low voltage buss is that the corners
> are rounded on the HV
> > buss to help reduce the effects of corona when the
> buss is in close
> > proximity of each other. Over 69kv the buss is usually
> round and the edges
> > are all smoothed down.
> >
> > Woo
> >
> >
> > > [Original Message]
> > > From: Finn Hammer <f-h@xxxx>
> > > To: Tesla Coil Mailing List
> <tesla@xxxxxxxxxx>
> > > Date: 7/28/2008 5:23:25 AM
> > > Subject: Re: [TCML] tcml primary self c
> > >
> > > DC Cox skrev:
> > > > After I saw all the corona in B&W asa
> 400 photos I shot with 4-8 sec
> > > > exposure time,
> > > Even posting this picture would not add much
> credit to your point of
> > > view. Pictures taken with the same film, and
> exposure times, of similar
> > > sized tubular coils excited by the same primary
> bang energy would have
> > > to be produced.
> > > Then a long term study of the effects on the
> secondary (Which I have
> > > already done) would also have to be produced
> > > >  I realized the sec coil would be slowly
> degraded using sharp
> > > > edged copper ribbon and quit this procedure.
> > > >
> > > Oh, so you _assumed_, in the stead of actually
> _observed_, that a
> > > degradation would take place.
> > >
> > > A lot of newbies are listening. Let`s stick to
> facts instead of adding
> > > to the list of coiling myths, shall we? Doc?
> > >
> > > Cheers, Finn Hammer
> > >
> > >
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