Re: Bi-polar almost done

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

Original poster: "John Richardson" <jprich-at-up-dot-net> 

Hi,

Well, I got it done, and performance isn't too good.  The specs are below,
and the primary SEEMED best at 5 turns.  I really couldn't see much of a
difference several turns either way.  Funny, same thing with my 5000/20
coil.  A turn one way or the other didn't affect much.  On my big one, one
turn sets safety's firing and there is no output, period.  Hit the right
spot, and watch out.

I also have to keep the spark gap, as well as the output gap, tight,
otherwise there are racing sparks and pri to sec strikes.  Is this a normal
bipolar issue?  Output is between 5-6 inches now, but I am hoping for a bit
more.  I tried following the advice of Scott Hanson, and placing a small
toroid on each side, and performance improved, but after retuning, lots of
racing sparks and pri sec hits.  I would appreciate any insight into sorting
this little guy out.  BTW, primary diameter is about 4 1/2 inches, leaving
about 1 1/4 clearance between the 2 3/8 secondary.  Due to the design of the
system, I can't go any wider.

Thanks,
John Richardson
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, April 13, 2004 9:53 AM
Subject: Bi-polar almost done


 > Original poster: "John Richardson" <jprich-at-up-dot-net>
 >
 > Hello,
 >
 > Well, I've almost got my little bi-polar done.  I know I did some things I
 > shouldn't have, but once I get something in my head, I stick with it
 > regardless of better judgement.
 >
 > Specs:  All of the guts had to fit into a space 8"w, 12"l, and 6"h.  It
was
 > tight, but after much head scratching, I got it.
 >
 > Secondary:  11 3/4" of #32 heavy build on 2" pvc, OD is 2 3/8.  Four coats
 > poly.
 > Trans:  9/30
 > Gap:  3 gap tungsten, forced air.  Keeping gaps close, to keep tank
voltage
 > down.
 > Cap:  9 .15uF 942s for a value of .0166.
 >
 > The primary isn't finished yet, as I need to set things up and experiment
 > with turns to get it in tune.  After I find the correct number, the
 > permanent setup will be 1/8 Cu tubing in vinyl tubing, with a diameter of
4
 > 1/2".  Leaves little better than an inch clearance between primary and
 > secondary.  Anyone have an idea of how many turns I will be looking
 > at?  I'm hoping that it will be between 3 and 5, to heep things narrow.
 >
 > I'm hoping to achieve point to point arcs of approx. 11-12".  If this is
 > unrealistic, I was hoping that any bi-polar gurus could give me a
realistic
 > figure.
 >
 > Thoughts and advice appreciated.
 >
 > Thanks,
 > John Richardson
 >
 >