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.
We found this crystal AM radio using a germanium diode in a Japanese magazine in 1967. The circuit...
This filter was found in Radio Electronics, and its configuration can be applied to any...
This circuit was obtained in an old English magazine (TSI) 1998 and consists of a Schmitt trigger...