[sdiy] Strange but very useful OPamp design! :-)

[karl dalen]

I wonder , why isnt there any hexa and,octa opamps?
I think it would be interesting, you could sell for instance
a octal with inverting only or non inverting only inputs,
or half inverted and the other half non inverted!

The idea would be that there would be two variants to buy
one where the inverted and noninverted would be summing
floating inputs with the regular feedback resistor to set gain
and a version with very high impedance on inverted and
noninverted devices both variants used as buffer stages
with gain of 1.

The manufacturer could mix devices in a package, for instance
in a SO16 you could fit 4 floating inverted inputs, 2 non 
inverted buffers and 2 floating non inverted inputs.

Applications?

Well many, as many as there are today for regular OPamps.
Others where they would ecxell ordinary OPamps, for instance
buffer stages in CV muxes, headphone and line driver buffers,
non resistor dependant signal inverters, integrators etc, etc.

Reg
KD