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# Re: [TCML] just a thought (Calculation)

```On the HD CD capacitor, If I recall right, the capaciticy for two plates
was about 150 pf, and each additional plate added about 75 pf.
Just  off the top of my head,

On Sat, Dec 28, 2013 at 9:56 AM, <mddeming@xxxxxxx> wrote:

>
> A decent approximation is:
>
>
> C=8.85x10^-12 x DC x A x (N-1) /d
>
>
> C=capacitance in uF,
> DC=Dielectric constant, air=1
> A=area of one plate, (sq.in.)
> N=number of plates,
> d=dielectric thickness (in.)
>
>
> Matt D
>
>
> -----Original Message-----
> From: Atomic <atomicrox@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sat, Dec 28, 2013 9:59 am
> Subject: Re: [TCML] just a thought
>
>
> Mark, I like the idea of a CD stack capacitor. I have lots of old CDs here
> :)
> Maybe you could sand the paint (and maybe the aluminum reflective layer)
> off the backside and place a thin tin foil with the same dimensions as the
> reflective layer? You'd leave a strap on one side to connect all layers of
> the same polarity together and alternate the side the strap exits. Then
> just build it layer by layer on the cd holder tube and connect each side
> together.
>
> Anyone knows how to calculate the capacitance for this?
>
>
>
> SNIP++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
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```