Re: Home-brew Capacitors
At 22:48 14/12/98 -0700, Steve Young wrote:
>Bottom line - building caps is a major undertaking. If people discover
>better ways to do it, please share.
Currently shifting house so the TC stuff is packed-up till Feb99.
However, have been doing research and recently got inspired!
Contacted a car battery manufacturer to source some of the plastic cases
they use. Couldn't sell any to me, but gave me a number as a sample. (you
need a manufacturer, not a distributor)
These are 'square' rectangular boxes with 6 cells set-up in a perfect
manner to build a 6-series vertical flat plate cap. Initial calcs suggest
should get 0.025 uF per "car battery". Vertical plates will avoid need for
vacuuming. Ready made inspection cap-per-cell facility allows checking oil
level & replacement.
Next problem is aluminium flashing is too thick (0.3mm or 12 mil) and
wastes space. Aluminium foil is too thin (0.01mm / 0.5 mil), tears easily
and has too high an intrinsic R value, especially for point connection
(this includes thicker "caterer's packs", which are only 0.012mm cf normal
Found a place which makes the foil "cake/pie bottoms". They have foil from
0.045 to 0.090 mm (0.15 to 0.3 mil) which they buy in 1000 kg rolls (no,
that isn't a misprint !!!!). They will sell me the end of a roll at
whatever weight I want. This is a perfect thickness. Thin enough to cut
with a paper guillotine but thick enough not to tear and allow a more
substantial electrical connection.
All in all, this will take a lot of work but the end result should be
"near-professional". I will post later & let you know, but I think this
has some potential.