[sdiy] Where to get parts?

[Bob Weigel]

The tendency for instance with op amps has been to make units with 
higher and higher slew rates, lower noise and offsets, or lower power 
with the best of those attainable.  Some of the older op amp designs are 
preferred in certain applications because of the....complexity that 
accompanies their 'deficiencies' I guess is a good way to put it. Some 
like myself still have stock of some old ones.  I have to add a few more 
sites people have put up recently ...Small Bear for instance.  Nice 
selection of some hard to find stuff.
     More and more people who have collected bags of obsolete parts are 
getting them up which is good to see.  But companies like Analog Devices 
still make a lot of useful stuff for diy designs.  Their site has a lot 
of spec sheets.
        Visual Sound has even released MN3207 bbd's as I recall at real 
reasonable prices, whereas previously there was no known manufacturer 
for those.  Filters have gone mostly into the digital realm of course 
and so..I dunno.  What do A6's use btw?  You can find various sites that 
sell NOS chips like SSM2044's at a fairly reasonable price.  Or watch 
ebay.  But as far as mass marketed filter chips these days...I'm not 
aware of any production.  Here's an interesting link. I haven't had time 
to study what exactly they are doing here but sounds a little like 
something I dreamed about doing..

http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/arvlsi/2001/1038/00/1038toc.xml&DOI=10.1109/ARVLSI.2001.915557

19 bucks a piece whatever they are.  Anyone seen that one?

      The best way to design is probably to conceive generally what you 
want to do with some basic understanding of the parts that are 
available.  Then if there is some aspect that you really would like 
something that is more tailored to suit a design idea, ask away and if 
it's out there someone can probably point you the right direction or 
you'll just find it in a google search. . -Bob

Jeff Farr wrote:

>I'm somewhat new to this and it seems radio shack/ mouser just won't
>cut it for alot of what I need.  I realize that alot of the vintage
>parts are damn near impossible to find, but what about the modern
>substitutes, any leads here?  Most useful would be some kind of
>general refrence material from which I can draw my own conclusions.
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