Rép : [sdiy] Hmmm...OK NOW you can panic :(

[Yves Usson]

Hi

Long ago, before CA3080 were available, people were using CA3096 (2 
PNP+3 NPN) transistor arrays
to build OTAs. A good example is the paper by Sergio Franco, Electronic 
Design, september 1976,
that you can download at my site :
http://www-timc.imag.fr/Yves.Usson/personnel/SDIY/archives/index.html

The problem is that the CA3096 is even more obsolete than the CA3080.
The good new is that Intersil sells a very good substitute ()
for it, with improved performance, which is referenced HFA3096 and
is available at a price of $2.00 per unit.
OK, this is fine for american citizens, but not for us european 
citizens, since these
have been classified by the US department of defense we must fill in an 
export compliance
form in wich we have to certify that we will not use these chips to 
build evil devices
and that kind of stuff !... Well I promise I'll a good boy Uncle Sam, 
can I buy
these chips now ? :-)

Cheers

Le mercredi, 29 sep 2004, à 09:48 Europe/Paris, mark verbos a écrit :

> Tom G's method was simply a pair of NPNs, a pair of PNPs and an extra 
> NPN at the bottom for the control path. The single NPN can be removed, 
> as in Don and Ian's oscillators, allowing an NPN pair for expo 
> control. It doesn't seem too bad to end up using 6 transistors insted 
> of an 8 pin chip and a matched pair. They do need matching tho, so 
> that makes it a little harder. You could use 3 matched pairs. How does 
> the noise spec compare though (not that the 3080 was a shining example 
> of how to be quiet)?
>

-------------------------------------------------------------
Yves Usson


email : yves.usson at imag.fr, yves.usson at ujf-grenoble.fr