Got some op amps coming and intend to putting some circuits together on the breadboard to give myself a refresher course in electronics - it's been over 20 years since school. So no intended actual use for the circuits right now, other than waking up some long lost memories and having some fun seeing the circuits do what they're supposed to do (or trying to figure out why they don't).
I have no problem finding the most basic example circuits; voltage followers, inverting and non-inverting amplifiers and so on, even integrators and derivators, but once we get beyond those I'm not finding very many good and interesting examples that could be fun to give a try. Anybody know a good source for a collection of examples? (I tried searching the forum, but couldn't limit the search to just the right kind of topics, just got an information overload.)