[sdiy] LM394 vs. MAT02 vs. ?

[Roy J. Tellason]

On Friday 05 November 2004 02:53 pm, Dana Scott wrote:
> Here we go, ARP questions. Now it's my turn.
> The ARP PNP/NPN  pairs were never electrically matched at all. Just take
> two transistors and stick them together.
> The ARP PNP matched pairs used in the later style VCF's were matched for
> similar current gains at 2 points. The LM3900 has current inputs so  the
> Vbe doesn't matter.
> The clips were solid copper, not merely copper-colored.( Like that
> matters)! -Dana

Not being sure,  I wasn't gonna say that...	:-)

> ----- Original Message -----
>
> > --- >> The ARP stuff I used to work on did some that way,  and some with
> >
> >> little copper-colored clips...
> >
> > How did the matching go with those? The ARP VCOs I have seen (and
> > heard) used a weird PNP/NPN pair. I have always wondered whether or not
> > one simply goes for the same Vbe, as when measuring two transistors of
> > the same type.