[sdiy] Chip Tempcos was RE: Solder paste and toaster ovens

[Harry Bissell Jr]

Arrh... do not agree.

I'd do just the opposite... keep the tranny thermally
isolated from the board, and from any drafts.  I'd
maximize the thermal contact between chip and tranny,
then insulate the whole thing in some styrofoam (the
non-conductive kind)

There is a kind of "packing peanut" material for
shipping that is a figure-8 shape of styrofoam.
1/2 of this stuff JUST slips over a TO-5 can

The idea is to keep the tranny from changing
temperature quickly.  Using large mass (like you
suggest) is one way, Isolation is the other.

H^) harry



--- Peter Grenader <peter at buzzclick-music.com> wrote:
> Harry Bissell Jr wrote:
> 
> > If I had to use the chip tempco, I'd epoxy it to
> the
> > bottom of the can, then solder teeny-tiny flying
> leads
> > to it (maybe 28ga) so that the leads don't
> transfer
> > heat FROM the board.
> 
> 
> Yes - I've considered this. but doing it multiple
> times I would probably
> also consider suicide by the time I was done.  The
> issue with transferring
> heat from the board doesn't concern me, it's
> something I would actually
> prefer. As long as it's transferring the same amount
> of heat to the chip AND
> to the tranny, I'm good., Using the board as a heat
> source (or sink?)  would
> probably help to stabilize the temperature delta
> between the two parts,
> which is the best solution I could ever ask for.
> 
>