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Re: [TCML] Toroid question



Andrew,

at my website, I show my TT-42 coil with a 4" x 13" spun toroid. The coil
produces 42" sparks using a robust 12/30 NST.  An ordinary 12/30 gives
about 38" sparks.

http://futuret.110mb.com

Cheers,
John


-----Original Message-----
From: Lau, Gary <Gary.Lau@xxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Fri, 29 May 2009 9:13 am
Subject: RE: [TCML] Toroid question



Hi Andrew,

As you noted, bigger toroid equals bigger streamers but fewer of them.

Personally, between the two choices you gave, I would choose the larger 4.5x18 toroid. I haven't personally built a coil powered by a 12/30 so I can't say how much larger than that one could go. Do you already own both of those toroids? If so, try stacking both of them and see how that performs, assuming that you
have sufficient primary turns to accommodate the lower frequency.

The final answer will depend upon how much time and cash you have available. Big spun toroids are expensive. If cash is limited, you may want to try the custom-made foam toroid that I had made - http://www.laushaus.com/tesla/foamtoroid.htm


Regards, Gary Lau
MA, USA

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Andrew Robinson
Sent: Friday, May 29, 2009 3:23 AM
To: tesla@xxxxxxxxxx
Subject: [TCML] Toroid question

I asked this once before but dont remember getting a very clear
answer.

With a 4" x aprox 22" secondary. 12/30 NST what would be an
appropriate
sized toroid? I've heard bigger toroid equals bigger streamers but
fewer
of them. I guess looking at it from the physics point of view, bigger
toroid = more capacitance = bigger streamer but longer charge times.

Basically we're looking at either a 3" x 12" spun toroid or a 4.5" x
18"
spun toroid. Also is there a better place to get these other than
ebay.
Can someone out there sell us one?
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