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.

Diodes and Transistors Tester (CB1531E )
This simple circuit, obtained from a Radio Shack documentation, tests transistors and diodes. The...
555 and 741 Tester (CB18746E)
This simple circuit is intended to test integrated circuits 555 and 741 in 8-pin DIL enclosures. In both...
Infrared Control Receiver (CB24830E)
This is a circuit for receiving signals from the previous transmitter. The circuit uses a common...