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[Fwd: 8" coil powered by NST's ?]



Original poster: "Jim Mora by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jmora-at-jetlink-dot-net>

Forgive my ignorance, but please speak to a "triggered" gap. Is it able
to encapsulate the first lobe of ringing thereby reducing energy loss?

Electronically speaking, this would seem doable. How much energy does
the secondary dump back to the primary?  For the sake of demonstration,
I will keep the coil more classic, sans explosive large caps and
limiting combustibles.

Arcs, no Flames:-)
Jim
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Date: Thu, 22 Nov 2001 23:23:02 -0800
From: Jim Mora <jmora-at-jetlink-dot-net>
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Subject: Re: 8" coil powered by NST's ?
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Hi Ted,

My NST's are paralleled bolted by dual steel 2" x 1/4 straps with
protruding stainless rack mount steel
handles ( far enough away from the electrodes when in operation). Yea,
ideally, it is a two person job. And I
do have a piano dolly to keep the center of gravity low, since they will
sit on the ground.

My secret weapon is my 20 year old son. A strapping Irish Man, that takes
after his Mother. Since I mentioned
"triodes" and vacuum  tubes , some here may not know what they are, best
forgotten maybe, but they are
invaluable in high energy, pulsed environments. I am 52 and still loving
electronics and life and can lift
those dudes, but what a pain in the back!

I "auto tuned" the relevant Java script parameters to arrive at the 13
turn, ~110K Hertz (cycles, my day),
which seems good to me. Anybody see some red flags here in these geometry's?

Thanks all,

Jim

Tesla list wrote:

> Original poster: "Ted Rosenberg by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
>
> Jim:
> if you derived the NST and MMC combo using the Java Script such as that on
> Bart Anderson's website, then you should also have the primary and the
> secondary parameters that go along with that. Just keep tweaking his formula
> until you get a Tuned Difference of 0% or..you are in tune.
> It's like when someone doesn't know the formula and merely uses trial and
> error numbers until the right combo is attained.
>
> My personal suggestion is to consider an 8" for anything of 120ma and up.
> My next hi-power coil (if I build it) will be 3, 15/60s and an 8" tube.
> Make sure that the resonant value of your MMC is upped to 1.5X to 2X for
> LTR. You'll want to use a triggered gap to save money and effort <!>.
>
> How do you plan to transport 100-125 pounds of NST?????
>
> Safety First
>
> Ted
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Wednesday, November 21, 2001 11:57 AM
> To: tesla-at-pupman-dot-com
> Subject: 8" coil powered by NST's ?
>
> Original poster: "Jim Mora by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jmora-at-fillmore.k12.ca.us>
>
> Hello All and Happy Thanksgivings USA,
>
> I have completed my HV supply, MMC bank (.021 uf), safety and RQ air blast
> gaps, and worm gear powered LARGE winding jig. I have two PVC coil  forms,
> 36" long, a 6.25 inch and a 8.125". The 8" is prepped. I would like your
> opinions on whether (2) 15KV/60 high power NST's will drive this coil or
> would it be better to prep and use the 6"?
>
> Specs:
>
> Primary: 15 turns .25 copper tube, spaced .25 with a 2" arc space on a 15
> degree incline. Java Tesla projects tapping between 12 and 13 -at- 112Khz for
> an 8" coil (about fifty feet of tube).
>
> Proposed secondary: 8.125 x 36" 22 AWG double formar.
>
> 1. What do you think? Will there be enough power? I may latter add LTR to
> .032 as I have the caps at hand.
> 2. What do you suspect would be the maximum toroid size (dryer duct) and
> still achieve adequate breakout?
>
> This is my first sizeable coil, except for small one I built out of triodes
> when I was very young which didn't do doodely squat:-).
>
> This coil will likely end up in a Faraday cage in our new science wing after
> I have had some fun with it!
>
> Thanks for your assistance.
>
> Jim Mora
> Systems Integration Specialist FUSD, MCP
> Land(805) 524-6007
> Cell (805) 558 3090
> Alpha Messaging http://www.msg.myvzw-dot-com/messaging.jsp
> Pager Number 8055583090