[sdiy] CA3086 and CA3046?

[Ian Fritz]

The Mouser catalog has CA3046, if that's what you want. I believe they are
available at several places if you look hard enough.

I still say the CA3083 is superior. Excellent matching and about half the
Re.

  Ian


----- Original Message -----
From: "Jim Patchell" <patchell at silcom.com>
To: <Christian at actor.freeuk.com>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, August 16, 2001 1:37 PM
Subject: Re: [sdiy] CA3086 and CA3046?


>
>
> Christian wrote:
>
> >
> > I managed to get quite a few (10) 3086's and I shall test the
> > transistors to attempt to get the best match. When all said and done,
> > if the VCO works and is stable then it doesn't matter what you use.
> > If she drifts like a ship lost at sea then I shall think again.
> >
>
>     The 3086 is exactly the same die...just not tested for matching.  I am
> willing to be you will find they match quite well.
>
> >
> > Another question. Anyone doing anything fancy with Pin 13 (substrate)?
> > I am currently tying all spare transistor bases and emitters to ground
> > (which includes that pin).
> >
>
>     Pin 13 MUST go to the lowest DC potential that any of the pins on the
CA3046
> will see.  The transistors are isolated with basically a reversed biased
diode
> junction.  You also have to remember that the breakdown voltage of this
part is
> only 20 volts, so choose wisely, although, I have stretched this and have
run
> them at 27.5 volts.  What I really need to do myself is set up a little
rig to
> test the breakdown voltage....
>
> >
> >
> > Thanks
> > Christian.
>
>     -Jim
>
>