Re: Bart's Coil (was How many STSG's in service?)

["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 John,
Thanks for kudo's on the coil.

I'll recheck the mutual inductance tomorrow. 0.159 may have been when I had
the bottom of the
secondary even. I've been up and down with it in the past few weeks, been
coding, and just finished
soldering an MMC with The Geek Group caps (I finally got to it. yea!!).

Anyway, I'll make a measurement with the secondary in it's current position
of 1.25" below the
primary.

Take care,
--
Barton B. Anderson
http://www.classictesla-dot-com


Tesla list wrote:

> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
> Bart's coil is a beauty and it appears to follow the outputs of the JHCTES
> Ver 3.3 very well.  Click on
>
>       http://home.att-dot-net/~couturejh/
>
> Enter for the 4 Primary inputs - Spiral
>   .042 - 11 - 0 - 11
> Enter for the 5 Secondary inputs
>   4.25 - 1721 - 42.73 - 28
>
> The outputs will be for the oper freq = 68.9 and the pri turns = 14.8 equal
> to Bart's coil specs.
>
> The output for the K factor = .157 assumes the sec and pri bottom turns are
> at the same level. This appears to be a little high.
>
> With the mutual inductance test and 2.653 amps in the primary the voltage
> across the secondary coil will be about 617 millivolts (the mutual
> inductance). With the secondary 4 inches above the primary the voltage would
> be 395 mv (mutual inductance) and K= .101
>
> Bart - I would be interested in the results if you ever make these test.
>
> John Couture
>
> --------------------------------
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Saturday, November 24, 2001 12:30 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: How many STSG's in service?
>
> Original poster: "Barton B. Anderson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> Hi J.B.,
>
> I'm using a rq/tcbor triggered arrangement. I think we are still
> beta-testing (I know I am). I'm using a basic
> circuit without resistors. I don't have much variation with the controller
> which I mounted on the control panel
> and left the rest under the coil. I think the pot used should be about 50k.
> My controller came with a 250k pot
> and I haven't tried a 50k yet. My controller doesn't have a diac to fire
> the triac gate, but I intend on
> throwing one in. My controller is not a Lutron, but one I picked up from
> ACE Hardware. Same basic circuit
> however minus the diac. I put in a 25A triac.
>
> Regarding performance? Not sure yet. At this point, the srsg out-performed
> the trigger gap. But for me, it's
> too soon to make a judgement. The trigger gap however is running sweet and
> cool, and this gap isn't any louder
> than my srsg.
>
> I took some photo's a couple weeks ago and through them  up showing the
> gap, coil, and sparks. I'm running at
> less than half power in the garage due to a metal bed which is up on the
> rafters and puts me in harms way  (the
> end of it is right over my head next to the control box and the other end
> is about 5 feet to the toroid). I've
> tried to keep it below this spark range.
>
> http://www.classictesla-dot-com/photos/tgk/tgk.html
>
> Take care,
> --
> Barton B. Anderson
> http://www.classictesla-dot-com