We found this circuit in a 1966’s General Electric documentation. The circuit uses diodes in unique GE packages, available at the time.
I found this circuit in a 1980 documentation, but it can be easily assembled with BC548...
We found this circuit in a publication about operational in the 90s. The circuit is based on the...
The author of this project found in a 1980 documentation gives the radio in two versions: the...