[sdiy] LM394 vs. MAT02 vs. ?

[harrybissell]

Dammit Jim there you go again...

just THROW THEM AWAY.  No WONDER your workbench is so, well...

...clean   :^P

H^) harry

James Patchell wrote:

> Transistors are so damn cheap that if for some reason a glued together pair
> turned out not to be matched, into the garbage can they go.  I am not going
> to sweat 10 cents...
>
> At 08:21 AM 11/5/2004 -0800, Metrophage wrote:
> >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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>
>          -Jim
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> http://www.oldcrows.net/~patchell
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