This circuit was found in Ferranti's 1974 transistor manual. The transistors are from the period and the frequencies generated are between 50 Hz and 2 kHz.
The 747 is an old operational amplifier. This configuration suggested in the component manual is...
Suggested by Siliconix in 1980s documentation, this circuit uses currently uncommon components. The...
In the figure we have a circuit to excite a piezoelectric capsule taking advantage of its resonant...