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Re: [TCML] Secondary Coil Wire
Hi Rob,
I think two wires side by side has been done before. The limitation is
the number of turns you can put on the coil as you've probably looked at.
The form is fine. I've used both thick and thin without problems.
As far as programs, Javatc is absolutely the most accurate program.
Teslamap is a neat program as far as a nicely formatted calculator and
doesn't have the layout limitations that we have with Javatc
(html/javascript). But from an accuracy standpoint, Teslamap is several
years behind the times. Old Javatc 9.1 and the late John Coutures JHCTES
program were both run exactly like this in the early days of programs
for TC use (forced to using top load error percentages, etc.). Both of
those were spin offs of Ed Sonderman's spreadsheet. Javatc has always
set the bar high. Teslamap is still using old methods, but they do get
you in the ballpark. There is a problem in Teslamap with the secondary
capacitance (way off). But, just a calculation error I suspect. The
other numbers are fine I guess without nitpicking too much. The top load
is the big problem in Teslamap. Teslamap can't predict the effects of
external capacitance (including the topload). The best it can do is calc
the isolated C and allow an error value which you can input. I checked a
coil with Teslamap just now and it required a 30% reduction to get close
to the actual measured value. This is no surprise. I remember being
forced into the same limitation years ago in Javatc.
Javatc has stood on the shoulders of giants. Thanks to the TSSP and Paul
Nicholson specifically, Javatc does account for most of these situations
and many others not even attempted by other programs. There's no reason
that Teslamap couldn't do the same (but Kevin would need to do some
major updates, and that is a daunting task). Doing these programs is far
more difficult than creating a spreadsheet calculator.
Javatc is simply my way of giving back to the community of coil
builders. No profits or anything of that nature. I am by no means
dogging Teslamap, so please don't misinterpret. Teslamap is fine for a
general Tesla Coil calculator and has the best format I've seen. But
when a question is raised about accuracy, Javatc wins hands down because
it has always "kept up" with the knowledge base of Tesla Coil physics.
Javatc input data is designed for "no limitations". Thus, you can
experiment freely with various spacing ratios, h/d's, geometries, or
whatever (and you will be handed more information than you will know
what to do with). That is of my own doing. Most of the outputs are of my
own choosing and the things I look at in a coil design. Javatc is
actually written specifically for "me". I chose to make it available for
all. I have always maintained this attitude with Javatc. Imagine if you
wrote a spreadsheet for your own TC calculations. Same kind of thing,
except I put it up on the web for others to use also.
Best regards,
Bart
Robert Davies wrote:
What do you all think of using two wires side by side like say a red
and green 20ga soldered with silver solder at the ends but rolled up
the coil together as one?
If you haven't guessed I have acquired my secondary form. I have
several pieces of 12" 10" and 8" sch 40/80 pvc water main/sewer pipe ,
yea a little heavy on the sch but the price is right "Free".The 12" is
the blue type, I would guess that color doesn't matter?
I have also been using the available TC design packages such as
JAVATC and TeslaMap. Is one any better than the other or should I use
both and and split the difference between them? I have noticed some
different numbers each produces with the same input parameters.
Rob
KI4HXT
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