Some Useful Operational Amplifier Circuits
Circuitsville Engineering has been actively collecting useful op amp circuits for many years.
A really good resource is the
National Semiconductor Application Note AN-31 (a 33 page PDF file)
which has a long list of possible opamp schematics.
One of the circuits on AN-31 is really useful when working with an Anadigm IC.
In an Anadigm, the inputs and outputs are differential, which is useful but not universal.
Being able to convert from Single Ended signals to Differential signals and back again
is a skill to keep handy.
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