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RE: [TCML] Choosing secondary coil form size
I think that the optimal secondary size may often be larger than what's considered "traditional". My 4/20 NST-powered mini coil benefited significantly when going from a 2" to a 4" diameter secondary (gap, cap, topload, and NST unchanged). It may be the bigger secondary forces a lower operating frequency, and/or the comparably higher Lpri results in lower gap losses. Whatever the underlying cause, I think that bigger is almost always better, and would not recommend less than a 6". Just don't skimp on the top load.
Regards, Gary Lau
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Michael Bellah
> Sent: Tuesday, March 04, 2008 1:37 PM
> To: Tesla@xxxxxxxxxx
> Subject: [TCML] Choosing secondary coil form size
> Hello list,
> I have decided to build my first coil and have sourced a NST from a local
> sign shop. Its rated output at 115v is 9kva/120ma. I was planning on using a
> secondary coil form around 4x24, but I was also planning on a smaller transformer.
> I am wondering if I should go to perhaps 6 or even 8 inch diameter due to the
> 120ma out of the transformer or is this a wash because it is only 9kva out? Thank
> you in advance for your help.
> Michael Bellah
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