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.
Found in a 1970s RCA documentation, this circuit generates signals according to the component...
This circuit was obtained in an 1975 English publication. It is a voltage regulator circuit for...
Found in a 90s 73 magazine for radio amateurs, this circuit makes use of common operational...