Re: [TCML] Bipolar coils

[Carl Noggle <cn@xxxxx>]

My high school science gang built a bipolar TC that worked well.  The 
secondary was 11" in dia and 48" long.  The Pri was 24" dia and 8" 
long.  We grounded the center tap.  We didn't use any toroids on the 
coil ends, just used the capacitance of the coil ends themselves.  It 
probably would have worked better with toroid--it certainly would have 
looked cooler.  The pri cap was ten one-gallon glass jars lined with 
tinfoil inside and out.  That made a beautiful discharge around the 
edges of the foil.  I forget what we used for xfmrs, maybe a couple of 
15-60s in parallel.  It helps is your friend's dad works at a neon sign 
shop.

If you don't ground the center tap, a ground arc to the end would make 
it think it's a unipolar TC with the ground at one end and the pri in 
the middle, at the half-voltage point, and you could get arcs to the 
primary.  We got the design from an old TC book that I wish I could find 
now.

---Carl


> Hi all,
>
> Thank you for your input, I'll be making a start on this project very
> soon now indeed and will update everyone on my progress.
>
> > Shannon Weinhold said :
> > And if you think about it, what you're doing with a bipolar is creating
> > a series loop relative to ground, pushing one side of the coil and
> > pulling on the other simultaneously, so that the hi-side of one side of
> > the coil is extreme negative and the other extreme positive, which is
> > really what we want in this situation.
> Shannon, thanks for that comment ....... that does of course make
> absolute sense, it's amazing how easy it is to overthink and thereby
> overcomplicate such a simple concept. Logic RULES! lol
>
> Again, many thanx to all concerned!
>
> Grant
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