XTAL oscillator with fine tuning (CB22403E)

We found this circuit in an old English documentation. The integrated circuit is of a specific type of the time.

Safe Class AB exit stage (CB21621E)
Based on the TL431, this class AB configuration circuit can be applied to power circuits of the...
Power supply with voltage tripler (CB22342E)
This source was found in American documentation from the 60's. The diodes are germanium, and the...
LED for model projects (CB22138E)
This circuit lights up with any input polarity, being used to light a railway composition with the...