Used in 1950s CW receivers, this type of circuit used germanium transistors. The circuit has excellent gain.
We found this 4-transistor receiver for the AM MW range in a 1960 transistor manual from Sylvania....
This 16-bit circuit was found in a 2005 Linear Technology application manual. The circuit uses...
The circuit is from an English publication from 1970, but it can be assembled with more modern...