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.

Aquarium Heater Intermittent (CB16559E)
This project was found in a 1988 documentation. The circuit intermittently activates an aquarium...
Static RAM 2114 (CB16005E)
This application shows you how to make use of the static RAM 2114 of 1 k. The supply is made with...
DC voltage follower with LM741 (CB25923E)
In a voltage follower the voltage gain is unity. The input impedance is high and the output...