This circuit is from a 1980s Motorola documentation. The circuit can be made with modern equivalent components. The original circuit is for the 115 Vac (110 V) grid and has two settings.
This circuit was obtained in a 1977 Radio Handbook. The transistor is from the era and the coils...
We find this circuit in the 80's own component manual. The power supply should be from 4 to 30 V...
Obtained from a 1969 documentation, this circuit can operate at frequencies up to 500 Hz, counting up...