This is a commercial circuit from the year 1958. Transistors are germanium types and transformers and coils are hard to fild today. The circuit is destinated to the reception of medium wave stations.
This 600-ohm output impedance circuit was found in a Radio Electronics from October 1963. The...
This circuit was found in ancient American documentation. Diodes are general-purpose types. |...
Found in American documentation from the 90's, this circuit is very current and can be implemented with...