This 6-transistor Japanese commercial radio was manufactured in the 1960s. The receiver is a super heterodyne type with germanium transistors and is powered by a 9 V voltage.
Charcoal microphones are rare today. In the figure we have a circuit that shows the use of one of...
This circuit was found in an old American magazine for radio amateurs. The circuit is based on a...
We found this circuit in Ferranti's 1974 transistor manual. Transistors are general-purpose types...