This 6-transistor circuit had excellent sensitivity using germanium transistors. The push-pull stage used two transformers, one drive and one output as we usually find at the time.
This series and parallel sensor circuit was found in Popular Electronics from the 1990s. Any SCR...
This super regenerative 1-transistor receiver was obtained in an American documentation from the...
This circuit with only one tuned coil was found in a 1980s American documentation. The circuit uses...