Re: [TCML] MMC design for 12kV @ 120mA xfmr

["DC Cox" <resonance@xxxxxxxxxxxx>]

Wow --- very nice performance.  What type of sparkgap were you using?

You should try a hyperbaric sparkgap --- you will be very impressed with its
performance.

Regards,

D.C. Cox

On Fri, Dec 5, 2008 at 6:52 PM, Jim Mora <wavetuner@xxxxxxxxx> wrote:

> Hi DC,
>
> My eight inch coil was a little shorter (35.5"). So I made a bigger top
> load
> to get more primary turns. 12x8" broke out just fine and performed well at
> 140volts in. (blown spark single gap) 6' to a target. 15/120.
>
> Jim Mora
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of DC Cox
> Sent: Thursday, December 04, 2008 2:57 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] MMC design for 12kV @ 120mA xfmr
>
> Each series string needs to be a minimum of 16 pcs for a 32 kV DC rating.
> Erms x 2.5 is an absolute minimum value.
>
> Each string will be 9.375 nF each, so dividing .04 / .009375 uF gives 4.2
> strings, so go to 4 strings at .009375 uF per string =  .0375 uF (37.5 nF
> at
> 32 kV DC) will work well with a 12/120 mA setup.
> I recommend an 8" dia sec for very high inductance ratio to give you the
> best output.  Wind 40" long with #22 AWG double-build insulated magnet
> wire.
>
> 64 total 0.15 uF caps required for this coil.
>
> Top toroid 24 x 6 inch size.   Dryer duct toroid will work fine.
>
> I have around 300 MMC caps (0.15 uF and 0.1 uF) in stock at present.
>
> Dr. Resonance
>
>
>
>
> On Thu, Dec 4, 2008 at 10:40 AM, John <guipenguin@xxxxxxxxx> wrote:
>
> > Planing out my MMC before I order some CD942c 0.15µF caps. I'm planing
> > on building my next coil with a 12kV @ 120mA xfmr.  LTR cap value =
> > 0.0398µF so I'm setting my cap value at 0.04µF.
> >
> > series string A: 2kV @ 0.15µF / 10 = 20kV @ 0.025µF
> > series string B: 2kV @ 0.15uF / 6 = 12kV @ 0.015uF
> >
> > Both strings in parallel giving 0.025µF + 0.015uF = 0.04µF
> >
> > Does that look good?
> >
> > --
> > <John Paine>
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> >
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