This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
This circuit, which is part of a percussion instrument, was found in the September 1979 issue of...
The circuit shown in the figure, generates a positive pulse whose duration depends on C1, from the...
Found in the 1989 Radio Electronics Experimenter special edition, this circuit was designed for...