This circuit is from a Radio Electronics from March 1960. The generator works with a 22.5 V battery, generating good intensity signals determined by the LC circuit.
This circuit is from a 1974 publication, but it can still be easily assembled today with BC548...
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...
We found this circuit for old tape recorders in the December 1972 Radio Electronics magazine. The...