Re: PE-rolled cap construction
In a message dated 3/19/99 2:35:42 AM Pacific Standard Time, tesla-at-pupman-dot-com
> Right now I am making rolled Aluminum Flashing / Polyethelyne
> capacitorsand I just made a mistake: I cut the flashing but I forgot
> to cut out a tab for the electrical connection. Can anyone think of a
> good way to still make the connection without using any sharp objects
> or taking away from the total area?
> Also, when I was calculating the size of the plates for the cap. I
> thought of this: Using the right size material so that if there are
> any or minor errors in construction that decrease/increase
> capacitance, they will not change the capacitance more than several
> Like on mine, the dielectric of the polyethelyne could be 2.0 (instead
> of 2.3) and I would still have a .005 uF valued cap., you could vary
> all the measurements significally and still have a the same value cap.
> Well just an idea I had.
I built mine with the flashing cut into long, rectangular pieces with all
edges rounded and deburred. Then I cut separate pieces that connect up to the
brass bolts on the case. These pieces are about 1.0" wide and maybe 10" long.
They are bolted to the flashing with #10 screws and nuts. One is on the
inside of the roll and the other is on the other end of the other piece of
flashing - on the outside end as it is rolled up in finished form. I just
made sure the screw doesn't protrude through the nut and added a couple of
extra pieces of about 2" wide poly under the bolt head for protection.