Re: Primary construction

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

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi MCP,

Nice when you get things like that! But, the #32 is secondary wire. I was 
curious about the primary wire and topload.

Take care,
Bart

Tesla list wrote:

>Original poster: The MCP <ejkeever-at-comcast-dot-net>
>Well, the wire I'm using is an interesting story... I got 8 rolls of #32 gauge
>from mpja-dot-com to be used to wind a *load* of small electromagnets in an
>attempt to build a maglev. I ended up using, um... 2 of them. So I've got
>about 3 miles of wire, and I wanted to build a tesla coil! And I've *still*
>got almost all the wire I started with...
>
>Having this huge amount of wire available was one of the things that made me
>consider making little "play-thing" size tesla coils.
>
>On Friday 19 September 2003 06:47 am, Tesla list wrote:
> > Original poster: Bart Anderson <classi6-at-classictesla-dot-com>
> >
> > Hi MCP,
> >
> > 2 turns sounds about right with a slight topload (maybe a point or your
> > coiled wire?). Could you do us a favor and give more info as to the wire
> > type used for the primary? We are still not clear on what your actually
> > using. The topload would also be much needed data. This type of data seems
> > to be very limited from coilers (full specs with center heights).
> >
> > Both John C. and I truly enjoy crosschecking against the programs. We love
> > doing it or we wouldn't. Your coil is pretty cool to run through the phases
> > because of the extreme h/d ratio and small size. The 196 ft of wire is
> > correct (the 394 may have been due to the JHCTES v3.4 radius limitation of
> > 0.5" as John explained). I personally won't recommend the toroid size
> > unless I know your supply specs. With more top C will mean more primary
> > turns. 1.2 MHz would indicate a linear current distribution (which would be
> > wrong).
> >
> > Fres will be higher, but only "you" can prove that with a measurement (John
> > C. and myself always push for measurements when possible). If you don't
> > have the equipment to measure then I certainly understand.
> >
> > As far as calculating the small coil of wire your using as a topload, you
> > might be hard pressed because it's difficult to model this as a topload
> > when it is in situation with other components, except modeling something
> > similar in shape, maybe a sphere. For example, I tried a sphere with
> > dimensions of 2" x 2" at a center height of 12" (above coil). Fres dropped
> > to 2.2 MHz and autotuned at 2.3 turns. Again, I have no idea of the topload
> > used, but this might be a method to try. FANTC may be another option as one
> > can be innovative in it's use. I may try that tomorrow if I get a chance.
> >
> > Take care,
> > Bart
> >
> > Tesla list wrote:
> > >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?
>
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>
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