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Re: [TCML] Table top safety

The small coils are great for their user friendliness provided the power is low enough for spark contact to be just a moderate prickle. They are a lot more approachable than a mid sized coil. Attach a light globe, small neon pilot or an ion spinner for variety but I get best value from a hand held earthed 6 inch car neon that people can painlessly draw sparks from the top. Or have a spark jump onto their hand for those that are brave. Toroid is best not used at this power to reduce output (= painful) and it is not really tuned for 2-3 inch sparks. You can't use a conventional MMC for this without using a lot of caps in series = expensive. I use a ceramic MMC but rated at 60kV to keep it large enough to avoid too much heating. My previous mini coil made up in a day from junk parts and a half section of an NST has been in the media many times. There was one time I had 3 network video cameras around it vying for position - a bit too close because when I increased the output they started to get hash on their viewfinders. (that's probably $150k worth). 
Peter www.tesladownunder.com
----- Original Message ----- From: "Jim Mora" <wavetuner@xxxxxxxxx> 
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Wednesday, November 04, 2009 3:18 AM
Subject: RE: [TCML] Table top saftey



Dr. Peter, and Tesla Downunder,

I could use 1/2 (center tapped) 5KV of the 10kv, 23ma Obit transformer to
achieve similar power I suppose. I'll check you great site and see if I can 
gat a rough in of the coil geometry. It will of course acquire the handle
"Downunder" coil!

Thanks,
Jim Mora
So Ca,USA

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Peter Terren
Sent: Tuesday, November 03, 2009 1:53 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Table top saftey

I use my briefcase TC.
The metal base is the couterpoise which is also connected to mains earth. I 
use an ex microwave oven mains LC and MOV suppressor.
It runs on 4kv NST and gives 3 inch sparks. Seems pretty safe to me.
My page is here
http://tesladownunder.com/teslacoilmini.htm
Or you should be able to see it on Discovery Channel USA in January along
with a lot of my other stuff

Peter
----- Original Message ----- From: "Jim Mora" <wavetuner@xxxxxxxxx> 



Hi,
Is anyone able to say what is the maximum power and size a small coil size 
should be for drawing sparks and generally lighting florescent bulbs and
such. No one should ne at risk. I have an obit and some fine wire. This
would be a tungsten single or double gap and some CDC caps. I have a group of adults that want to see a scaled down version as proof of concept and I 
don't want to make streamers at this juncture as I am trying to rent a
backspace with a roll up door.
I definitely would sink a ground rod in the center of the floor as they
are
using PC's in the office  which is separated by restrooms;~)  It a good
thing I am a retired PC specialist with a M$ cert.
Thanks,

Jim Mora


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