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Re: [TCML] bipolar coil

Hi Kris,
I also assumed a series connection on the primaries. But, lets see, if parallel configuration then inductance halves for the same number of turns, so I guess you could then add more turns to the coil keeping the cap size unchanged. This "might" not be a bad way to go considering your stuck with such low turns at present. You would end up at about 4.15 turns per coil with the .0265uF cap size.
This is all speculative. A scrap primary would be very helpful. Test both configurations before settling on any particular one. 

Take care,
Bart

S&JY wrote:

Hi Kris,

For spark gap coils, I suggest the primaries should be connected in series,
not parallel.  This gives higher primary impedance, meaning it will absorb
more energy and less will be wasted in the spark gap and connecting wires.
The primary cap value for series connected primaries will be half that of a
single primary. 
Tuning the primaries takes a bit more effort than for one primary.  One must
adjust two taps, keeping the number of turns in each primary the same.  But
it's worth it - a twin coil will produce up to 40% longer streamers than a
single coil for the same power input. --Steve Y. 
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Dean
Sent: Saturday, May 03, 2008 8:22 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] bipolar coil

On Saturday 03 May 2008 05:27:41 am Kris Grillo wrote:

I think I'll just stick with the original plan of 60mA.


Hi

Primaries in parallel and 46nF tank cap should tune
(each primary) near 6 turns and be 1.84 times resonant
cap size for a 9x60 NST. Frequency about 367kHz.

No accounting for extra inductance in tank wiring though,
that might just be the killer.

later
deano
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