[741 type op-amp|http://en.wikipedia.org/wiki/Operational_amplifier#Internal_circuitry_of_741_type_op-amp] And of course the SWL-40+ stuff, e.g.: * [KU4QO's Guide|http://qsl.net/kf4trd/lessons.htm] * [Block Diagram PDF|./ham/sw_40-blockdiagram.pdf] * [Component Dictionary(!)|http://epic.mcmaster.ca/~elmer101/sw_dictionary.html] ...if you know any more like this please add them.