Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
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...