Found in an EDN from the 90s, this circuit makes use of integrated circuits of the time, some of which are uncommon today. The output is given by:
Where:
This receiver was found in an American documentation from the 60's. The circuit uses germanium...
We found this circuit in an old American documentation from the 70s. The Triac can be of any type...
This MW bedside radio was found in an English documentation from 1989. It is based on a dedicated...