This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time, but a modern transistor of equivalent power can be used.
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...