[sdiy] LM394 vs. MAT02 vs. ?

[harrybissell]

I could not find the e-mail I got from Bob Pease in response to asking
him the npn/pnp matching question. This is for memory

1) Choose transistors with a high Hfe (beta) to start with

2) match for similar b-e drops at the same current.

(of course you don't touch them with warm fingers, etc... just like what we do
for
npn matching)

Our discussion matched Rene's answer... the npn/pnp is good enough for many
apps...
why use more ?

H^) harry

Scott Gravenhorst wrote:

> "Carole Anne Scott" <turbo at mustangs.com> wrote:
> >This is the official ARP method:
> >Reach into a bag of 2n3904's.  Pull one out.
> >Reach into a bag of 2n3906's.  Pull one out.
> >Stick them together.
> >Repeat.
>
> Ok.  Is this because there's really no need to match them?
>
> >-Dana
> >
> >
> >----- Original Message -----
> >> How does one match NPN and PNP like 2N3904 and 2N3906?  (sorry if I missed
> >> this)...
> >>
> >
> >
>
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