This small commercial radio for the MW band with germanium transistors was found in Japanese documentation from the 1960s. The circuit is powered by a 9 V battery and has a 455 kHz IF.
We found this circuit in April 1979 Radio Electronics magazine. The circuit is based on the 555...
Another one of the many possible oscillators using tunnel diodes. This has its frequency...
Suggested by an American technical documentation, this circuit is polarized in order to provide an...