[sdiy] LM394 vs. MAT02 vs. ?

[Metrophage]

Not a bad idea, but wouldn't a permanent pair be easier? If you do the
matching well enough ahead of time there seems to be little reason why
one would need to change these.

I am guessing that two transistors which are encased in glue or epoxy
are going to be better thermally matched than two out in the open with
goop between them. This way they are not only (for the most part)
thermally matched to each other, but also insulated a bit from ambient
temperature changes.

What I am considering, while I plan my next array of built-from-scratch
stuff - is using DIP headers to make little epoxy pods which include
the expo pair and their tempco resistor. This way the whole assembly
sockets easily, and can be swapped out with no trouble if one is
dissatisfied with it, or if it is damaged.
CJ

--- John Speth <johnspeth at yahoo.com> wrote:

> > > > And if you want to be real cheap, try hand
> > matching a pair of
> > > > 2n3904's...they work fair well (you must glue
> > them together to make them
> > > > work)....
> > >
> > >How does one do this?
> 
> I saw a good idea once (I think it was on sdiy) that
> you can apply heat sink goop to the flat sides of the
> transistors and then use a ty-wrap to hold them
> together.  You get a good thermal joint that is not
> permanant.
> 
> JJS
> 
> 
> 
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