Re: Plate Caps of PCB (fwd)

Subject:   Re: Plate Caps of PCB (fwd)
  Date:   Sun, 20 Apr 1997 21:20:50 -0600 (MDT)
  From:  List owner <listown-at-poodle.pupman-dot-com>
    To:  tesla-at-poodle.pupman-dot-com

> >I just made a stacked cap with 16oz. copper (measured thickness is 25> mils) and 6 plates
> >each with 206 sq. inches of area. 120 mil> ployethylene dielectric and light mineral oil as
> >the drowning agent.
> Hi all,
> I've been thinking of making a stacked cap from fibreglass PCB.  
> So, I figure
> I'm not the first person to have thought of this - I wonder if anyone
> here has actually made
> one ?

Yes, I have made several using double-sided pc board blanks.
I etched 3/4 inch from the outside edges and soldered wire
leads on. I used them dry on a 7.5KV 30ma supply with much
better results than with the doorknob caps I had been using.
While these are rather lossy at the frequencies we're using
(in general) they are a very inexpensive and quick solution
to a total lack of capacitor-building material. I still intend
to try them in an oil bath to supress corona, and since the pcb
itself is somewhat permeable, perhaps it will increase the
dielectric strength a bit. As for the rest of your questions,
I'll have to refer you to the more knowledgeable people on the list.

Good luck, and be safe!

     Rick Holland

     The Answer is 42.