On Thu, 13 Jan 2005 13:09:02 -0000, "Airy R.Bean"
wrote:

I wonder if there is any mileage to be had from adapting
the numerous junk-mail CD's as the vanes of ATU
capacitors?

1. We already have a form that is circular (no waste) and
with an accurately-positioned central hole.

2. There is a metallic film sandwiched between the plastic.

3. Is this film to thin to stand up to the RF currents that
will spread out across it when charging & discharging?

4. How would we make metallic contact to the film without
destroying the film at the point of contact?

5. Does anybody know the type of metal making up the film, i.e.,
can we solder to it?

6. Is the plastic of a suitable quality? Will it arc-through?

A little Googling would soon show you whether the critical factor,
which you doubtless have already determined from your preliminary
calculations is the loss tangent for the CD substrate, may well render
such a use as inadvisable.
--
from
Aero Spike