[sdiy] Thanks Everyone! (say, any CA3094's out there?)

[patchell]

Cynthia Webster wrote:

> Hi list!
>
> I just wanted to thanks everyone for being so helpful!
> Thanks to you, I found the search engine for the Archives, and am very
> grateful...
>
> (now I'm looking for CA3094 chips and - oh my!
> They're very scarce!
>
> Why?

    We all ask that question...a lot of great chips have disapeard over the
years.  The SSM series, the CEM series, various parts by National
Semiconductor.  The CA3060 (triple CA3080) is gone.  Analog design is getting a
bit more difficult to do.  I just hope that Intersil does not discontinue the
CA3280.  It is the corner stone of all of my designs.  There is quite a list of
parts that can be made that have been discontinued.  And the reason is sales.
Many of these chips just don't have any main stream use any longer because there
are less expensive solutions.  Take a look at the market, there are not very
many true analog synths out there, and no mass produced ones that I know of.

>
>
> (What's the  *big idea* of these huge companies making things, and getting
> us to design stuff using their pinouts - only to have them Yank the product
> - saying it's "obsolete" and then *not* offering us any upgrade, equivalent
> or replacements?
>
> That's Not very nice!
>
> Of course I've spent hours and hours on a circuit only to find out *now*
> that the part's not available... Anyone want to sell two or three used ones?
>
> So well, now I'm wondering if it's possible to wire-up my own CA3094
> equivalent circuit onto an 8-pin dip header, as a sort of "Franken-Amp"
> to plug into the socket - where a *Real* CA3094 should be...
>
> Any ideas?

    The CA3094 is basically a CA3080 with a darlington driver.  Denpending on
how you use the darlington, you can either use a CA3080 with a discrete
darlington output, or use an LM13600/700...either of these solutions would take
a bit of research to determine which one is best for your situation.

>
>
> (Did You say a room in Maui?  Really? The moonlight on the waves)?  LOL!
>
> Thanks Everybody!
>
> Cynthia

--
 -Jim
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