This oscillator was found in a 70s RCA linear circuit manual. The oscillator makes use of an integrated device from the time, difficult to find today.
This circuit provides both frequency and voltage division. The circuit was found in a 1966...
This circuit converts a signal from any waveform into a rectangular or square signal of the same...
Found in Unitrode documentation from the 1980s, this circuit makes use of PUTs, currently common...