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.

Bq26601 3 A Battery Charger
July 2017 - Texas Instruments' new 3 A bq25601 single cell battery charger can be found on Mouser...
Ring Counter using PUT (CB5205E)
This circuit was found in old documentation. PUTs are uncommon components today. The circuit...
0 to 20 second timer (CB20370E)
This simple timer with unijunction transistor was found in an old American technical...