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.

Negative Voltage Regulator (CB15903E)
This circuit is suggested by National Semiconductor and makes use of the negative regulator LM2990...
Divide-by-10 Counter - 4018 (CB171)
One 4018 is used to divide the frequency of a digital signal by ten as shown here. The maximum...
Amplifier for piezoelectric transducer (CB12530E)
Operational amplifiers with field effect transistors at the input are ideal for applications where...