Re: Tune?

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Bill -

There are also a couple good design programs online. JHCTES and JavaTC.
http://www.miramar.sdccd.cc.ca.us/faculty/jcouture/tesla/index.asp
http://www.classictesla-dot-com/java/javatc.html

The secondary is fine as well as your cap. It would be a good idea to
measure the capacitance of the cap to
ensure it is truely near your calc'd value. Once you know your cap size,
simply design the primary to fit the
design (adding 2 or 3 turns more than you actually need). Also, don't
forget to design in the top load. Once
a top load is placed on the secondary, it will lower the frequency and
change your primary tune point. I'm
the guy that put up JavaTC, so if you happen to use that particular program
and have questions, just ask.

Take care,
Bart
--
Barton B. Anderson
www.classictesla-dot-com

Tesla list wrote:

> Original poster: "Neil Richardson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <neil-at-opticalrealities-dot-com>
>
> I used WinTesla and done a little ROUGH calculation for your coil, and here
> is a primary 4 u:
>
> Inside Diameter: 7"
> Wire Gauge: 1
> Spacing Between Turns: 0.810"
> Total Turns: 15.0
> Type: Flat Archimedes Spiral.
>
> That should work with your 0.0106uF cap. Good luck!
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: 19 January 2002 16:22
> To: tesla-at-pupman-dot-com
> Subject: Tune?
>
> Original poster: "Bill Bockman by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <billb187-at-hotmail-dot-com>
>
> I have a 30" tall 6" diameter secondary coil.  The secondary coil is wound
> with #22 gauge magnet wire.  My step up xformer is a 15kv 60ma neon sign
> transformer.  The primary coil was made of 1 gauge stranded wire, 9 turns.
> My coil has an air blast gap and beer bottle capacitors that had an
> estimated capacitance of 0.0073uf.
>
> THIS SETUP PROVED NOT TO WORK.
>
> In re-examining my plans I found that if my coil was 27.5" tall, I would
> need a higher capacitance value, one in the range of 0.0106uf.  More primary
> turns would also be necessary (15).
>
> All of this information I gathered through using Tesla Coil CAD.  My
> secondary coil is 30" tall, the program says I will need more than 15
> primary turns (and doesn't help me more than telling me that) because my
> secondary inductance frequency is too high, above 144khz.
>
> What I am asking is can I use the secondary coil I have built?  If so what
> type of primary design would be effective?