Re: [TCML] Mirrors as glass plate and "foil" style caps?

[Steve Ward <steve.ward@xxxxxxxxx>]

This is not quite correct, look again at the winding construction of these
capacitors (yes, even the film/foil 942C type from CDE).  The floating plate
is metalized and must carry current laterally across the body of the
capacitor.

The trouble comes with making a discrete electrical connection to the
metalized stuff, so the foil is better in that respect, and is used for the
plates that are electrically connected to the leads.  I believe normal full
metalized film capacitors just use more metal spray on the end of the roll
to make this contact, which is indeed likely to fuse under extremely high
pulse currents.

Steve

On Wed, Aug 26, 2009 at 7:35 AM, Lau, Gary <Gary.Lau@xxxxxx> wrote:

> With "good" MMC caps, I believe that the metalized (vapor-deposited) plates
> are only used for the floating plates (between the main plates). For the
> main plates that have the end-terminations to the leads, correct me if I'm
> wrong, but I think these still need to be solid foil to support the high
> current densities at the terminations.  The floating plates just transmit
> current front-to-back so have low current density.
>
> Regards, Gary Lau
> MA, USA
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Steve Ward
> > Sent: Tuesday, August 25, 2009 11:33 PM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] Mirrors as glass plate and "foil" style caps?
> >
> > Dont forget our MMC caps are also just metallized material carrying the
> > current, though the current is distributed vastly different than what
> would
> > happen with some huge panes of glass, so i think its likely you would
> just
> > cause it to fuse and blast away.
> >
> > Steve
>
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