When I think about all of this, including @MarkT's comments it makes me wonder if the whole thing is too technical for this Forum.
it simpler for "dummies" (no disrespect, referiing to the "... for dummies" books)
Its not really THAT technical - the photodiode amplifier has three components external to the Arduino.
.. and a question: the comparison table (post #3) is very small - is there a way to make it full width?
Thanks Mark - very interesting. None of the IC's I have tested have that feature so it must just be audio amps. It would prevent some of the applications eg sine or triangle oscillator from functioning properly.