Sorry, perhaps off-topic but relevant given the pursuit of mineral
mining globally. In 1968, the U.S. Bureau of Mines had a very accurate
model (pre-econometric, if there is such a thing) of Mica production in
India down to the State level (primarily Bihar - the poorest state in
India). As a college student, I never understood why. A decade or so
later in as a "professional student in another country", it dawned upon
me why this information was relevant.
On 2/10/19 7:13 PM, Bruce Griffiths wrote:
Mica is a sheet silicate mineral little or no carbon present.
Bruce
On 11 February 2019 at 11:15 Bob Bownes <[email protected]> wrote:
Yes, those brown roughly 1" square caps used intact sheets of mica as
dielectric. You can easily split the mineral into uniform, thin, transparent sheets.
Beware inclusions that will make the surface rough and change the behavior,
particularly breakdown voltages.
The reconstituted caps are still around - used in high power RF circuits (mica
has really low loss, but high epsilon) and in Tesla coils (a sort of special
case high power RF). Most of them are surplus Russian/Soviet.
Hmm, mica is pretty much hexagonal version of graphite/carbon/diamond created
when there is a large axial force and the proper temperature. It is synthesized
for many uses today, I’d be very surprised if precision high voltage caps was
not one of them.
That being said, thanks for the insights into the 5061A/B. Now I feel the need
to go power mine up!
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