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Bi-Polar Discussion

From:  DC Cox <resonance@wildblue.net>
Subject:  Re: [TCML] Bi-Polar TC

The biggest error experimenters make with bipolars is to make the coeff. of
coupling too tight which promotes tracking sparks, commonly called racing
sparks.

With a 4" dia. sec coil, the usual distance above horizontal plane of the
pri for base of sec is 1.5 inches, which means the two secondary windings
have to be separated by approx 3 inches --- with the pri a flat Archemedian
spiral.  Failure to move each sec outward far enough to set the k value
to a reasonable amount (usually 0.1 to 0.14) severely reduces the max sec
output spark.

Dr. Resonance


On Thu, Feb 12, 2009 at 3:25 PM, Weinhold Shannon L <
Shannon.L.Weinhold@doc.state.or.us> wrote:

> Thanks Chris.
> I told him the same thing before I saw that you had written this.
> I didn't have the link though.
>
> Shannon Weinhold
> Coffee Creek Correctional Facility
> Behavioral Health Services
> Mental Health Infirmary
> 503.570.6761
>
> "The problems of today cannot be solved by thinking the way we thought
> when we created them."
> -Albert Einstein
>
>
> -----Original Message-----
> From: Christopher Karr [mailto:chriskarr4@hotmail.com]
> Sent: Wednesday, February 11, 2009 4:03 PM
> To: Tesla Pupman List
> Subject: RE: [TCML] Bi-Polar TC
>
>
>
> If you'd like to see one (I'm not sure you can tell how it's supported,
> but you can ask the guy), you can go to a youtube video made by my
> friend, Shannon. Here's the link -
>
> http://www.youtube.com/watch?v=YabWJooBCyY
>
>
>
> > Date: Wed, 11 Feb 2009 21:42:08 +0000
> > From: jhowson4@comcast.net
> > To: tesla@pupman.com
> > Subject: Re: [TCML] Bi-Polar TC
> > CC:
> >
> > oh no! some how the link I had was deleted. Here is the type I am
> trying to make.
> > here is the link
> > http://www.electrotherapymuseum.com/2007/TSC/index.htm
> >
> > ----- Original Message -----
> > From: jhowson4@comcast.net
> > To: "tesla list" <tesla@pupman.com>
> > Sent: Wednesday, February 11, 2009 9:41:55 AM GMT -05:00 US/Canada
> Eastern
> > Subject: [TCML] Bi-Polar TC
> >
> >
> > Hey Guys I was wondering if i could pick your brains about the bipolar
> Tesla coil. Specifically what the best way to mount the secondary Like
> this would be. I am planning on making a small 9kv 30ma coil over the
> summer
 


---------- Forwarded message ----------
Date: Sat, 22 Sep 2007 23:22:18 +0000
From: Jeff Behary <jeff_behary@hotmail.com>
To: tesla@pupman.com
Subject: Bipolar Horizontal Coil - 16" Discharges

Hey All,
 
Here is a new coil based on some ideas from Thomas Stanley Curtis texts.
http://www.electrotherapymuseum.com/2007/TSC/index.htm
 
A bit strange, but similar to the designs used for early wireless experiments and X-Rays.
6.25" diameter Secondary Coil wound in two sections 10.5" long each on a 24" ABS form.  Midpoints are connected together and grounded to Primary Coil.Primary coil is 2" wide copper strap, 1 1/2 turns, 12" diameter.  Secondary coils are wound with 18 AWG enameled wire, about 230 turns per section.
Adjustable capacitor was used for tuning,  .020 mfd seemed to work best without any dischargers.  (This'll be increased to around .024 mfd when thedischarge terminals are added).
The power transformers are two MOTS wound with primary coils in anti-parallel and secondaries in series with a reactance coil to limit the currentfrom 15 - 20 amps.  The spark gap is a 2-series quenched gap, 3/4" diameter tungsten.  
 
Discharge at 18" is pure brush from each terminal, 6-8" long.  At 16", sparks will occasionally jump the distance about every 2 or 3 seconds.  At 12 - 14" hot discharges occur between the terminals.  
Jeff Behary, c/o The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com