[sdiy] looking for a quad opamp

[jhaible at debitel.net]

> Unfortunately the 4136 has some odd pinout.
> I have seen quad 741 ICs, perhaps they still exist.

A quad 741 will not work. (not single supply, not
fast, not low input current ...)

What I have found so far is a TLC274C - looks ok, but
a little faster would be better. 

JH.

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