RE: Do these numbers look right?

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

Original poster: "John H. Couture" <couturejh-at-mgte-dot-com> 


Joseph -

Note that 765 turns divided by 20 inches equals 38.25 turns per inch, too
large. The typical TPI for # 22AWG is 36.6 so you will have 20 times 36.6
equals 732 turns. The JHCTES computer shows 276 Khz res freq with the 4 x 24
toroid and 576 Khz without toroid.

With a .007 uf pri cap the pri will be about 12.1 turns and this will reduce
to 7.4 turns with increasing pri cap to .02 uf.

You can get more info by clicking

      http://www.miramar.sdccd.cc.ca.us/faculty/jcouture/tesla/jhctes33.asp

Enter

Primary   .007   5.5   0   4.5

Secondary   2   732   36.6   0   26

John Couture

----------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Monday, February 16, 2004 7:08 PM
To: tesla-at-pupman-dot-com
Subject: Do these numbers look right?


Original poster: JOSEPH CACCIATORE <jocatch-at-us.ibm-dot-com>


Hello again. I am well on my way to designing my first TC after giving up
trying to restore my old PE magazine coil from 1964. I checked and there
are a slew of programs and spreadsheets written to help design a TC.
Unfortunately some give different results for the same input conditions.

The program I found to be extremely helpful is an Excel spreadsheet called
the Tesla Coil Designer 3.0 by Ed Sonderman and Corey Ruch. It is great
because you can adjust the secondary/primary parameters and watch for when
they come in sync.

But never trusting any program fully (i.e., Tax Deluxe say I had an extra
$1800 coming back on my tax return, it was wrong!), I was hoping someone
could verify and look at these numbers to see if the coil really will
perform before I spend all this time, effort and money.

If anyone is willing, here are the specs I came up with:

NST = 12,000v, 30ma, 60hz
Secondary = #22 wire, 20" long, 4" diameter, 765 turns-at-97%
Primary = flat spiral, I.D. = 6", 15 turns, .25" pipe, .25" spacing,
width=7.25"
Capacitor = .007uf
Toroid = Dmin= 4", Dmaj= 24"

The spreadsheet says secondary res F = 257kh, primary res F = 221khz.

My concern is if I use any larger cap, I can't get the prim/sec parameters
to match good enough. Also, I don't have any material for a toroid here
that I can look at so I assume 4" almunin flex hose but I don't know if 24"
is realistic. Lastly, the primary requires 53' of copper tubing. I am not
sure where to buy such a long length. I have seen only 25' at Home Depot.

Thanks.
   JC