[TCML] bipolar coil

[bartb]

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 at pupman.com [mailto:tesla-bounces at pupman.com] 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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>