[sdiy] Op-amps CA3140 v. TL074

[David G. Dixon]

> Thanks for that -- I don't remember looking at that chip before.  If you
> can live with those levels of bias current and slew rate then it looks
> like
> a good choice. It looks like the single unit has been discontinued,
> though.

I did a calculation for my update of Ken Stone's Analog Shift Register, and
came to the conclusion that, even at 50pA, other forms of leakage would
cause droop long before bias current to LF444.  I also used guard traces.
As predicted, there is no perceptible droop even after several minutes.