In the figure we have a good rectangular signals generator with several frequency bands. The circuit is based on old logic but can be implemented with modern equivalents.
This stage of two complementary transistors was found in a 1977 Radio Handbook. Transistors admit current...
This circuit is from a manual of linear integrated circuits of the 80s. The operational is of the...
Found in Popular Electronics from the 90s, this circuit reaches a few tens of megahertz. L1, C1...