Electronics > Projects, Designs, and Technical Stuff
Home Brew Analog Computer System
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SeanB:
A soft flexible thermal pad on top of the transistor and the thermistor on top of that. Cover them all with a small potting box that is left unfilled, but glued to the board to keep draughts out. Mostly isothermal, enough thermal mass to keep both stable and simple. Can't remember the manufacturer of the soft pink foam thermal transfer pads that are so common on CD drives.
GK:
That sounds like a plan. I could fold up some little rectangular cans out of brass or copper shim and solder them up along the seams. The SOIC could be enclosed by a (say) 50 thou-thick, rectangular perimeter GND track to which the up-turned can gets soldered - a bit like an RF screening can, but just to keep air currents out instead.

Or perhaps I could just glue a plastic coke bottle screw-cap onto the board.

SeanB:
Not metal, you want insulation, not extra capacitance. Small potting box, matchbox inner tray or even a cardboard cut and glued to suit ( I did this for a crystal as an oven) will work. Even styrene sheet cut and scored, stuck together with glue and held down with some double sided tape.
GK:
Cardboard isn't very robust and is a bit shabby. I'm liking the glued down plastic coke bottle cap right now.............   
SeanB:
Pulling a Bob Pease now are we..... He did the same on a thermally sensitive appnote, inside a biscuit tin, on a sheet of copper clad board with a lot of dead bug.........
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