Poul-Henning wrote:
I've often wondered what would happen if you put one of these
circuits (xtal, vref etc) in a suitable small box, and filled
the box with with aerogel powder:
* * *
I'm pretty sure you'd get very stable temperatures, my worry is
that you'd get too high stable temperatures...
I think over-insulation is a very real worry, given what the web site
says about the thermal insulating properties. The properties they
described seem to be those of a solid block or sheet -- the powder
may not be quite as good -- but still, it seems like you'd be going a
long way toward emulating a dewar, and it is very easy to
over-insulate an oscillator or other circuit with a dewar.
Another possibility is glass microballoons (also called
microspheres), which are just what they sound like. They are a very
common filler for epoxy when a featherweight composite is required.
Either one would probably be kind of messy....
Best regards,
Charles
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