RE: [TCML] Designing a Coil Around a SRSG

[Brandon Hendershot <brandonhendershot@xxxxxxxxx>]

Hi Phil,

I was reading that last night actually, very interesting indeed. Too bad I
can't make use of it.
Considering that, will the recommended value of 55.3nf be 'good enough'? I
was also thinking of running a higher multiple of 120bps and dropping the
capacitance. But to achieve the same output power I'd need to double the
input mA, right? Any other downsides to going beyond 120bps with my NSTs?

Thanks,
Brandon H.

On Mar 23, 2013 12:57 PM, "Phil Tuck" <phil@xxxxxxxxxxx> wrote:
>
> Brandon,
> Richie Burnett, a respected UK coiler did some work on resonant charging
12
> years ago using an RSG, whereby the ballast and MMC value dictate the
> charging circuit's resonant freq. This aids charging, but is dependent on
> bps rate.
> See his posting here
> http://www.pupman.com/listarchives/2001/June/msg00679.html and also his
> relevant webpage on the method
http://www.richieburnett.co.uk/external.html
>
> Not suited to NSTs unfortunately, as you need to use an external ballast,
> but it may prove interesting. A fellow coiler and myself have both used
his
> methods successfully.
>
>
> Regards
> Phil Tuck
>
> www.hvtesla.com
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Brandon Hendershot
> Sent: 23 March 2013 03:51
> To: Tesla Coil Mailing List
> Subject: [TCML] Designing a Coil Around a SRSG
>
> Hi All,
>
> Now that I've finally gotten something out of my long overdue 3.5" coil,
> I'm already itching to start work on the next.
> I've decided to make the switch to a rotary spark gap and have settled on
> synchronous over asynchronous for the sake of performance and security of
> my NSTs.
> I want to be sure I do this coil right and plan everything out before I
buy
> anything. Here are the parts and specs for what I know is going into the
> new coil:
> - 15/120 (4 x 15/30) NST Bank
> - 7.25" x 26" Topload
> - 0.25" x 0.25" Flat Primary Coil (Plenty long, should be enough
regardless)
> *- ~6" x 24" 25** AWG Secondary Coil (*subject to change(**especially so))
>
> I've read that 120 BPS is just about the best you can get when you're
using
> NSTs, so I'm going to be building the rest around that. I haven't found a
> motor yet, any specific RPM to look for? HP will vary since we don't know
> what style we want yet.
> I'm assuming not (you know what they say about that), but does the
> capacitance of the MMC vary depending on the BPS? Since it's synchronous
> with the AC waveform and firing at a single frequency I imagine not...
> Rather, isn't the Input watts the only determining factor? Silly me. Next
> question:
> Does the BPS have any influence on what the resonant frequency of the
> secondary coil should be? <This would be my primary concern.
>
> One more quick irrelevant question, moving from a 15/30 to a 15/120, would
> there need to be any modifications made to the Terry Filter?
>
> Thanks a bunch,
> Brandon H.
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