We found this circuit in December 1986, Radio Electronics magazine. It uses 3 inverters and has the frequency determined by the crystal. The power supply is 5 V.
This is the patent for the zener diode regulator circuit by David B. Dean of Austin published in...
This simple 10-position roulette circuit with the 4017 found a 1987 documentation. The circuit can...
This circuit was found in a 1986 documentation. The circuit has a common configuration with the...