# Re: [TCML] MMC building - some questions

```If res value is .013, then use approx 1.4 x Cres, or 1.4 x .013 = .018 uF

Erms x 2.5 = 12,000 Vrms x 2.5 = 30 kV DC required rating.

One string of 16 caps = .009, so two of these in parallel will give approx
.018 at 32 kV.

Total caps required is 32 for this build.  It takes more caps but this is
the right way to do it.

Dr. Resonance

On Sun, Oct 5, 2008 at 6:00 AM, Thomas Ryckmans
<thomas.ryckmans@xxxxxxxxxx>wrote:

> Hello,
>
>
>
> I am now building my MMC. From previous JavaTC calculation, I need about
> 0.013 uF to reach resonance. Since I am using CDE capacitors
>
> 942C20P15K-F (2000Vdc 0.15 uF) I would need a single string of 11 caps to
> reach 0.013 uF and have a (recommended) voltage rating of 22kV.
>
>
>
> Since 1/Ctotal =1/C1+1/C2+... 1/C11 I have
>
>
>
> 1/Ctotal = 11/Cn = 0.0136 uF
>
>
>
> The question is: can I put ONE extra cap in parallel with another within
> the
> string to tweak the total capacitance if needed? In effect, one cap in the
> string becomes a larger cap, with twice the value at 0.3 uF
>
>
>
> 1/Ctotal = 1/C1+1/C2+. 1/C11 with say, C1= 0.3 uF and the others at 0.15 uF
>
>
>
> Then 1/Ctotal = 0.01428 uF
>
>
>
> A small sketch is here:
>
>
>
>
>
>
>
>
>
> Could this be an easy way to tweak my tank cap value, adding caps in
> parallel to caps in the initial string to a max possible of 0.027 (which is
> equivalent to two strings in parallel)
>
>
>
> Many thanks
>
>
>
> Thomas
>
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