Compensated 4049 CMOS Oscillator (CB24855E)

This circuit appeared in Radio Electronics in November 1984. The frequency depends primarily on C1. The signal generated is rectangular.

Programmable Gain Operational (CB18630E)
This circuit was obtained in an American documentation translated in the 80's. The circuit can be...
Wheel of Fortune (CB20962E)
This electronic roulette circuit with 10 numbers was found in a Popular Electronics from the 80s....
Precision Heater Control (CB25880E)
Based on a CA3059 zero-cross switch, this circuit was found in the July 1995 Electronics Now...