It serves as a reference, since today we can have simpler and more compact solutions. This circuit is from an Electronics Experimenter Handbook from 1992. The integrated circuits are from that time.
This Colpitts oscillator with JFET has the amplitude of the signals stabilized by a diode. The...
This circuit is from European 90s documentation. The integrated circuit used is not very common...
This circuit of an old publication makes use of SCRs that admit modern equivalents. The frequency...