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.

Subwoofer Filter (CIR25262E)
This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The...
Dual Speed Control For DC Motors (CB12443E)
12 V motors and current up to a few amps can be controlled by this circuit that we found in a 1991...
Synchronized Pulse Generator (CB19132E)
We found this circuit in a 90's European schematic. The circuit can be implemented with almost any...