[sdiy] Matched transistors and EFM circuits?

[dj hohum]

> I suppose the general answer: if you want tracking "good enough" for VCOs,
> use a matched monolithic pair. A SSM2210/2220 are <$4.50, you can get
> tempcos for ~ $5, so why even *worry* about it?
>
> For a VCF, even something like a 3086/3046 is fine. As if $10 blows your whole
> budget :)
>
> Paul S.
> life is too short to worry over $10

Or perfect VCOs.  Of course, in truth, life is the longest thing we
do, we have no personal experiential reference for anything longer :)
But now we're getting way off topic.