Found in the June 1987 issue of Radio Electronics magazine, this circuit uses well-known CMOS components. The circuit has a CMOS amplifier stage that drives a small speaker.
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...