From: Zuma [SMTP:mwise-at-ns.sosis-dot-com]
Sent: Thursday, January 29, 1998 4:35 PM
Subject: Di-electric Chart??
I just thought of something. Many people have posted di-electric charts.
That list the "k" value and breakdown voltages. I was thinking that why
don't they add the loss factors of the di-electrics. Because believe it
or not. Not many people want to make just a poly capacitor, for numerous
reasons. One being the fact that a rolled capacitor is extremely hard to
roll when a large capacitance is needed. Also even if you make two caps
in series or parallel the cost sky rockets.
Glass caps are in most opinions the worst. Why is there more info on
these than say plexiglass or some other di-electric. I was told that
such as plexiglass, it has less losses than glass does but it is still
low on the list. In my opinion there are several different di-electrics
with out hitting the hardest and most expensive ones. That is why the
loss factors should be given on a di-electric chart.
Just something to add. The poly caps that most construct are in my
opinion not as hailed as they should be. Because they are not the best
and in some cases depending on quality of the poly, the cap could be a
total flop. Which I for one can't afford to have happen. More than
likely you will spend $50 + on these things, with no guarantee the thing
won't fail because of error somewhere. I think the loss factor would
help in many ways if it were given on all of the di-electrics. Because
after all which would you rather have to do replace a few plates or
totally lose your cap and build a new one. I have learned that you have
to make sacrifices to be able to gain anything.