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Re: Coil specs, Was Cap/SG config
Original poster: "Gregory Hunter by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
Poor performance can have any number of causes. For
one thing, you have a feeble power supply. For
another thing, spark gap performance is probably the
single most important variable in Tesla coil
performance, and you admitted that you don't even know
the spacing of yours. I suggest a sturdy single
static gap that is easy to adjust so you can readily
experiment with different gap spacings.
I studied your specs, and I think your cap is too big,
and your primary is too small. I suggest a new
primary with at least 10 turns, 12 would be better.
Resonant charging might give you a boost, and for that
you need .005uF. As it turns out, a six pack of 12oz
beer bottles is almost dead-on .005uF, so try removing
four or five of your 15oz jars (after you build the
Good luck with it,
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Matt Shayka by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <flyboxboy-at-hotmail-dot-com>
> Hi all,
> Here are my coil's specs
> Coil diameter: 3 3/4 in(3.75 in)
> Wire size: 26awg
> Length of form wound: 10 3/8in
> Close wound, ~577turns
> Topload: metal sphere, 1 1/4in diameter
> Empty "radius": 1/2 inch
> The primary is an inverse conical type, 45 degree
> angle, secondary is 1 inch
> below bottom primary turn(Oops!)
> The primary is wound with 8 awg wire, 7 turns, 5 in
> inside diameter, 1/4 in
> spacing, 7 3/4 in outside diameter
> 10 SW caps at 15 fluid Oz each(remember, they are
> jars, not bottles)
> Tranny: 10kV /23mA Obit
> SG: air cooled series static gap, 4 gaps at who
> knows what spacing
> The problem with my coil is that no matter how hard
> I tune it, no matter how
> many caps I add, the spark length never exceeds 6".
> Dunckx has helped me
> greatly but none of it seems to work with my coil.
> He says that I should be
> able to get 12" sparks at least from it. I do like
> how it blasts CD's apart
> though. It seems to be the only thing it is good at
> besides refusing to work
> for me.
> It works best with the 1 1/4 in diameter sphere on
> top of it. I have tried
> foil toroids and even two metal bowls put together
> to make a sphere. It did
> nothing but lose spark length. Oh, BTW, it does have
> 1/2inch streamers!
> Pretty long, eh? ;-) HELP!!!
> Matt Shayka
> Geek#1127 G-1
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