Found in Motorola documentation from the 1970s, the circuit presented uses a component from the era that is not common today. The characteristics of the coils are given next to the diagram.
This simple test for general purpose NPN and PNP transistors was found in a 1974 publication....
This flip-flop is triggered by touch and uses as a base a CMOS integrated circuit of type 4093....
Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The...