Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The circuit uses components that are still common today.
Found in American documentation from the 1980s, this circuit can be designed with equivalent...
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...
We found this circuit in an American 1980s documentation. The circuit can be assembled with modern...