Hi there,
If your looking for opamp examples, a usefull and simple one would be....
The various outputs from the a100 are at different levels. For example, gates from the a161 and from the square wave of an a145.
Both of which are different from the trigger outs of my 606...
If your building diy CMOS modules, which, otherwise are quite easy to understand, then the ICs will need their own input range,
shaped correctly using opamps.
Some sort of opamp shaping exmples would then maybee be a good starting point
Cheers,
Julian
(cmos is just what im up to at the moment... hence commnet ; )