rolled caps

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: rolled caps
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 21 Apr 1998 00:18:42 -0500
• Approved: tesla-at-stic-dot-net

----------
From:  Jeff Corr [SMTP:corr-at-enid-dot-com]
Sent:  Sunday, April 19, 1998 8:29 PM
To:  Tesla List
Subject:  Re: rolled caps

Kevin, trial and error work so much better :-)
I know from the past, plate size of 24x65 will get you
around .0125uf with 90 mils between each plate (around
30kv)


>#1......
>
>            0.224 x K x A
>       C  = ------------- x (N - 1)
>                  D
>
>C = Capacitance (in microfarads)
>K = Dielectric constant
>D = Distance between plates in inches
>A = Area of plate in inches
>N = Number of plates
>
>and....
>
>#2.....
>
>                          2.248965 * 10^-7 * K * A
>C (microfarads) = ------------------------------------ * (N-1)
>K=dielectric 
>const.
>                                         d
>
>!!!Again, you need to multiply this result by 2 for a rolled up cap.
>This is the formula I generally use when making homemade caps.
>
>ok, so which one is the right one?
>
>thanks,
>Kevin
>
>
>

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