Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz. Operational amplifiers are from the time, as is the matching pair of transistors.
This crystal-controlled 1000 kHz oscillator was found in 1980s American documentation. The...
This circuit using a SIDAC as a relaxation oscillator was found in the ON Semiconductor manual for...
The configuration shown is from the National Semiconductor Linear Applications Handbook. The...