This 6-transistor Japanese radio from the 1960s used germanium transistors and had an output power of 180 mW. The circuit is of the superheterodyne type with push-pull class B output.
In this circuit from a 1991 publication, we can use the 2N2646 unijunction transistor and the...
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
This static switch or electronic contactor was found in a 1968 Motorola publication. The triac...