Re: coil spark size??? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 11 Aug 2007 20:42:49 -0400
From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: coil spark size??? (fwd)

I agree with Chris, I have never fried an OBIT, and have even used them with 
half shorts in TC use.  They eventually do die if used in this manner (so I 
guess "never fried" is not accurate, but I have never fried a good one, even 
when terribly overstressed), and they tend to have sparks race all over the 
ceramic terminal, but the TC runs.
Scott Bogard.


>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: coil spark size??? (fwd)
>Date: Sat, 11 Aug 2007 12:43:22 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Sat, 11 Aug 2007 13:57:49 -0400
>From: Crispy <crispy@xxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: coil spark size??? (fwd)
>
>Just a quick side note about OBITs: I made a coil with an OBIT once, and
>it appeared to be very stable.  Even with adjusting the spark gap to its
>maximum length (that it would still fire) and no filter on the hv, the
>OBIT survived without problems.
>
>Chris
>
>On Sat, 2007-08-11 at 08:46 -0600, Tesla list wrote:
> > ---------- Forwarded message ----------
> > Date: Thu, 09 Aug 2007 19:00:21 -0700
> > From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: Re: coil spark size??? (fwd)
> >
> > Hi j?,
> >
> > Your operating well into resonance with the parallel OBIT's. You might
> > want to double your capacitance to keep the voltages tame as well as the
> > bps (it's a little high right now, but not terribly). I personally have
> > not run an OBIT and not sure how it fairs say compared to an NST's
> > secondary over volt problems. On most toroids of home-brew design,
> > corrugated ducting or similar is used and this causes various streamers.
> > In other words, completely normal. I'm sure you could increase spark
> > length on this coil however. The gap and the cap value are two good
> > places to start.
> >
> > 12" sparks are ok, but it can be increased. Typically, one might calc
> > about 31" for the power, but in the case of being as close to resonance
> > as you are, I would actually expect more like 43". Thus, I think the 12"
> > of spark length is showing that you could certainly make some
> > improvements. Cap, gap, and topload are the areas to concentrate on to
> > achieve that.
> >
> > Take care,
> > Bart
> >
> > Tesla list wrote:
> >
> > >---------- Forwarded message ----------
> > >Date: Fri, 10 Aug 2007 18:50:25 +0000
> > >From: jhowson4@xxxxxxxxxxx
> > >To: Tesla list <tesla@xxxxxxxxxx>
> > >Subject: coil spark size???
> > >
> > >hey guys i am just wondering if the spark size that i am getting is 
>about
> > >right these specs
> > >
> > >spark lenght max 12in but at the same time there is about 7-8 smaller
> > >sparkes ( i am wondering if that is because of my toroid size)
> > >
> > >
> > >specs about 600khz coil height is about 20in primary is an invers cone
> > >tapped at about 5 turns primary cap is .01uf home made using 
>polyethylene
> > >and tin foil. you know the stuff I can afford in high school
> > >
> > >transformers are 2 23 millamp 10,000v OBIT transformers wired in 
>parallel
> > >soon to be 4 of the same in parallel
> > >
> > >spark gap is 2 bolts seperated by under a 1/2 inch on the blowing end 
>of
> > >my dads shopvac i am on vacation so i probably will repost this with 
>more
> > >accurate specs once i get home
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
>
>
>

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