This circuit uses a transistor module, a version that preceded the integrated circuit. The circuit is from a Radio Electronics from May 1958.
We found this circuit in a 1980s American documentation. The operational amplifiers of the...
Two inverters of a 4069B type CMOS integrated circuit form this oscillator which is characterized by having...
Taken from the 1982 SGS manual on integrated circuits, this preamplifier was used in commercial...