This 6-transistor radio was sold in Japan in the 1960s. The super-heterodyne circuit for the OM band was powered by ordinary batteries.
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
This circuit is from a 1965 General Electric manual. It uses components from the time that admit...
This amplifier is from Motorola's 1990 Linear Databook. The circuit can be used with operating...