[sdiy] PNP Matched problem...CA3096

[harry]

No... you blew it. The 2SC1583 is the NPN

you mean the 2SA798 (PNP)...   ;^)

I've used both.  My favorites are still the MAT-01, 02, 03, 04
from Analog Devices... but I've used the 2SC1583 and 2SA798
as well.

If you are going from the CA3046, or 3096... usually you have
set your pinout to use the differential pair at pins 1,2,3,4,5...

The 2SC1583 and 2SA798 fit this beautifully !

H^) harry

patchell wrote:

> "M. Falconi" wrote:
>
> > Subject:
> >     Date:
> >          Fri, 04 Jan 2002 01:00:57 +0100
> >    From:
> >          "M. Falconi" <thermen at libero.it>
> >
> > Thanks at everyone for all answer about my question.
> > I realized many problems with two matched PNP transistor in CA3096.
> > Ach......Grrrr....Mmmmm
> > I work with Electronotes VCO ( see schematics on
> > http://homepage.mac.com/mauriziofalconi/pict/synth/vcoschem.html ),
> > and the exponential converter work with PNP matched AD821 ( i no found
> > this or similar pair ).
> > Now i use  two 2N3906 "Home VBE Matching" but no good.
> > Question: it's better a CA3096 temperature controlled or is more simple
> > another patched transistor with 2K TempCo resistor?
> > I see in Jim Patchell site a MAT 03, but is very difficult  for me in
>
>     Actually, I have MAT04's.  For PNP's I have THAT120's (in stock until they
> run out, they are no longer made).
>
> >
> > Italy found this transistor .
> > I found a 1K TempCo resistor at Farnell in UK, but Farnell no near at my
> > house....today the europe is still large...
> >
>
>     There are other alternatives to using TempCo resistors, but you still need a
> pretty good set of transistors.  You should be able to use a matched pair of
> 2n3906's (I have used unmatched ones fairly succesfully as well).  You do
> realize they must be glued together with epoxy in order to track well.
>
>     Another good PNP choice is the 2sc1583 (did I get that number right?).
>
>     Anyway, it is posible to use the reference transistor for a temp sensor and
> to use that to control the gain of an OTA to do the temp compensation.
>
>     If you look at http://www.silcom.com/~patchell/smb1/smb.pdf, on page 21 U94,
> U90A, U92A/B and  U93C make up the expo converter/temp compensation, although,
> this one is for NPN expo transistors.
>
>     For PNP type transistor expo converters
> http://www.silcom.com/~patchell/synthmodules/vocalfilter.pdf, Page 9 shows an
> expo converter/temp compensation for PNP's (in fact, I used matched 2n3906's
> here, no prob).  U20B, Q5,Q6, U24A make up the guts of the circuit.
>
> >
> > Thank for help
> >
> > Maurizio
> >
> > ----------------------------------------------------------------------------
> >
> > Thank you for visit my Theremin / Analog Synth amateur site
> >
> > ----   " OFFICINA ANALOGICA"  ----
> >
> > http://homepage.mac.com/mauriziofalconi/
> >
> > WELCOME!
> >
> > Maurizio Falconi - Siena - ITALY
>
> --
>  -Jim
> ------------------------------------------------
> * Visit:http://www.silcom.com/~patchell/
> *-----------------------------------------------
> *I'm sure glad Merry Christmas comes just once a year
> * -Yogi Yorgensen
> ------------------------------------------------

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