RE: [TCML] Primary selfC

["Lau, Gary" <Gary.Lau@xxxxxx>]

I wrote:  I think my Fres was about 12 MHz.

Correction - it was 24MHz.

Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Lau, Gary
> Sent: Thursday, July 24, 2008 5:05 PM
> To: Tesla Coil Mailing List
> Subject: RE: [TCML] Primary selfC
>
> Hi Chris,
>
> The short answer is I don't know of a formula or calculator, but it's relatively easy to
> actually measure it.
>
> Just as you drive the base of a secondary with a signal generator and monitor a
> capacitively coupled scope probe for a peak, you can do the same with a primary.
> With a known inductance and Fres, you can calculate the Cself.  I think my Fres
> was about 12 MHz.  I recall that for mine, it wasn't too many pF, and certainly not
> something that would affect primary tuning.
>
> Regards, Gary Lau
> MA, USA
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Chris Swinson
> > Sent: Thursday, July 24, 2008 3:59 PM
> > To: Tesla Coil Mailing List
> > Subject: [TCML] Primary selfC
> >
> > Hi all,
> >
> > Does anyone know how to work out , or know of an online calculator for
> > crunching primary Self Capacitance ?
> >
> > I know its not normally needed to know these values, though my tank cap is
> > 3nF in my High Q design, and now my primary will be 4 turns of 2" wide strap
> > separated about 1mm apart.. the dia is about 22" so its a fair length and it
> > could add up to a few hundred pF which is a real problem.. so I need to know
> > the values...
> >
> > Cheers,
> > Chris
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