Re: Primary construction

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

Original poster: The MCP <ejkeever-at-comcast-dot-net> 

Thank you for the info. I've got a few quirks, however: When I use .75" dia
(2.35" circumfrence) times 1000 turns, I compute 196 feet of wire, not 394...
Something got doubled. But for some reason, we both got about 1.2 Mhz (The
simple calculator I used probably doesn't account for self-capacitance)...
???

At any rate, I'm currently using 2 turns, varying from 2.5 to 3.5 inches high,
and it's working about as well as it was previously (2.5" streamers -- 3"
arcs). I'm beginning to wonder if something is wrong with the coil itself; Is
the 27 Ohms (Measured DC) of resistance excessively high/low for a tesla coil
like this? What about the large amount of self-capacitance caused by using
such fine wire?

Finally, how can I calculate the capacitance of the small coil of wire I
mentioned that I currently use as a topload? Plus, is there a difference
between the energy in the topload being stored as an electrostatic (toroid
topload) vs electromagnetic (I presume the little coil stores energy as EM)
field?

On Wednesday 17 September 2003 03:52 pm, Tesla list wrote:
 > Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
 >
 >
 > MCP -
 >
 > The JHCTES Ver 3.42 TC computer program.
 >
 > Pri - 2.5" rad -3.5" hg
 >
 > Pri Cap - .006 uf
 >
 > Sec - .75" rad - 10.5" hg - 1000 turns - 95.24 TPI
 >        5.03 mh - 392 ft lg - 3.69 uh Cself
 >
 > Fres = 1167 Khz - no topload
 >         5.34 Pri turns - 3.1 uh
 >
 > Fres = 606 Khz - 10 pf topload
 >         10.28 Pri turns - 11.49 uh
 >
 > Streamer Spark = 10"
 >
 > For other parameters go to
 >
 >      www.mgte-dot-com
 >
 > Click TESLA, JHCTES, Go to bottom of Book page.
 >
 > John Couture
 >
 > -------------------------------------
 >
 >
 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Tuesday, September 16, 2003 10:04 AM
 > To: tesla-at-pupman-dot-com
 > Subject: Primary construction
 >
 >
 > Original poster: The MCP <ejkeever-at-comcast-dot-net>
 >
 > My two new TDK caps arrived today, meaning that I now have 6nF/40Kv of tank
 > capacitor. However, this obviously throws the old setup completely out of
 > whack. I've been trying to get resonance again, but failed miserably.
 >
 > So, here are the specs:
 > Secondary: .75 inch dia, 10.5 inch wound, 1000 turns, 196 feet of 32 gauge
 > wire
 > Primary is helical, 5 inches in diameter, with 3.5 inches vertical to work
 > with
 > Tank caps are 3 X 40Kv/2nF TDK caps, X-fmr is 5000/20 NST.
 >
 > I've tried using JavaTC at classictesla-dot-com, but it's not working. After
 > giving up in it, I tried using 2, 3, 4, 6, 8, and 13 turns, none of them
 > that
 > much better than the other. I've got more 22 gauge wire than you want to
 > know
 > about and about 10 feet of .375 inch copper pipe to work with. HELP ME,
 > PLEASE!
 >
 > PS, JavaTC says the coil resonates at 750 Khz. Is it on crack?