This game for 4 competitors was found in a Popular Electronics from the 80's. The circuit has CMOS technology and can be powered by voltages from 6 to 12 V.
This Rytron transmitter was published in a 1953 book. The circuit can be implemented with a BC558...
Foto-Darlington for applications such as light sensor. In normal applications only the collector and...
This circuit was found in a 90s Popular Electronics. It generates tones given by the oscillators and...