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

["Jim Mora" <wavetuner@xxxxxxxxx>]

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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