Re: help with bipolar design

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "john cooper" <tesla-at-tesla-coil-dot-com> 

Howdy:

You might want to check out my Bi-Polar TC, here's a link to its page on my 
website:

http://www.tesla-coil-dot-com/bipolar.htm

Lots of specs and construction info is posted there.  FWIW - With those 
size toroids you mentioned, I'd be thinking of 1kVA to 2kVA of input power 
and 28awg magwire seems too small, I'd go for 20 to 22awg.

Cheers,

John F. Cooper
Irvine, CA
www.Tesla-Coil-dot-com
www.FrankensteinsLab-dot-com



---------- Original Message ----------------------------------
From: "Tesla list" <tesla-at-pupman-dot-com>
Date:  Wed, 21 Jul 2004 17:47:56 -0600

 >Original poster: tesla-at-blankadventure-dot-com
 >
 >
 >Hello, I don't post much but I've been a long time lurker and have built
 >several coils in the past.  For my next project I'm looking to build a
 >bipolar coil, mainly because I like the antique look.  It will NOT be
 >center grounded; ie, it will just be one continuous coil of wire.
 >
 >Here the specs I have to work with:
 >- 12/30 or 12/60 NST
 >- 28 AWG wire
 >- two spun aluminium toroids, 14" total diameter, 7" diameter of the hole
 >- static spark gap
 >- LTR MMC
 >
 >so this is what I have to design my coil for.  For my secondary I want to
 >use the Jean Freau approach (so more secondary turns)...I figure 35"
 >winding length.  That'll give me a 10:1 ratio, which is double the standard
 >5:1 ratio, which I understand is what you want for bipolars.  This will
 >result in approx. 2552 turns.  How does this all sound?
 >
 >For the primary which will be solenoid in shape, I figure a diameter of 14"
 >should work.  This would give a 3.5" clearance from the secondary form.  Is
 >this too much/too little?  Also, I have no idea on the number of turns or
 >spacing....please advise!
 >
 >
 >
 >