This circuit is from a factory manual from the 80s. The circuit can be implemented with more modern operationals. Capacitor C1 is a low leakage type. The power supply must be symmetrical.
This circuit appears in several versions in publications of the time and can be modified by...
This transistorized “grid dip” oscillator was found at Radio Electronics in June 1953. The...
This 12 V symmetrical power supply provides a current of the order of 100 mA according to the...