Hi,

I am interested in integrating a $SUBJ very tightly with a very small
board. That means build it, as all parts are too big for this.

I am thinking of the halfcircle-shaped cavity differential type, built
between a sandwich of 3 FR4 boards, top and bottom 0.5mm and middle
(spacer with halfmoon/halfcircle channel machined into it) 1.5mm with no
traces. The electrodes will be etched directly into the top and bottom
thin boards.

This and running the hot electrode off the PIC's clock through a buffer
and using two rectifying detectors to feed two AD channels is the easy
part. Now what juice do I use ? Mercury is very tempting but I'd rather
not. Some sort of electrolyte is needed that will not foam and not stick
to the walls too much. High specific gravity is nice. Stopping short of
'milking' a large electrolytic capacitor for the prototypes, what could I
use ? Salt water should work, some sort of light oil seeded with something
conductive ? Come to think of it, some blood plasma will do fine
according to specs <g>.

Peter

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu