This circuit mimics the trill of a bird. We found it in an American documentation from the 90s. It is based on the LM3909 integrated circuits.
This constant current source for high voltage loads was obtained from a 1967 General Electric...
Found in a 1980s telecommunications documentation, this balanced modulator circuit uses...
This circuit was found in Texas Instruments documentation from the 1980s. The circuit has a Q less...