[sdiy] SIP filter modules coming

Gordonjcp gordonjcp at gjcp.net
Tue Apr 24 08:52:04 CEST 2018


On Mon, Apr 23, 2018 at 04:21:57PM -0600, Ian Fritz wrote:
> 
> 
> > On Apr 23, 2018, at 2:20 PM, Gordonjcp <gordonjcp at gjcp.net> wrote:
> > 
> >> On Mon, Apr 23, 2018 at 12:18:55PM -0700, Jay Schwichtenberg wrote:
> >> Don't know if you're talking about the CA3280/2164s or CA3046/CA3096s.
> > 
> > The CA3046/3096es.  They're not especially well matched, compared to
> > what you can get these days.
> 
> How do you know? Have you tested any? 

Yes, I have, albeit old ones.  I don't know how new the "newest" ones
are, probably not a whole lot newer.

Vbe and hFE are all over the place.  They are closely thermally coupled,
which is a help I guess.  Other than than, any two random BC548s out of
the bag will probably be closer matched these days.

-- 
Gordonjcp




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