[sdiy] CA3046 vs. CA3083 and matched pair madness

[Ken Stone]

>
>I've got a whole bunch of CA3046s and CA3083s to pass out tomorrow. When 
>is one better than the other?
>
>For VCO design, Ian favors the CA3083.

Then that's your answer. 3046 if price is important. 3083 if performance is
important.

>And... what about a cheap array of matched PNPs? 

No such thing. It's to do with the limits of the chip production technology.
PNPs built using the same processes as the 3046 etc were of planar design,
and were very much a case of "it will just have to do, even though it
sucks". They were usually included with NPNs, and most if not all are now
discontinued.

>Also, PNP pairs like the MAT03 and 
>SSM2220 seem like severe overkill for something like a filter. Of course, 
>not that that would stop Paul S. from doing such a thing. ;)

Go the Patchell way and use a pair of 2n3906. I bought a bag of 100 and set
down to match them for his vocal filter. I could have used them straight
from the bag they were that close.

Ken
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>