This simple circuit for the 3 to 30 MHz range was found in the Electronics Experimenter Handbook Special Projects of 1983. The coils consist of 10 and 50 turns of 32 wire on a 1 M x ½ W resistor.
This circuit was found in an American publication from the 1980s. In the original version it...
This circuit is from an American documentation of the 1980s. The circuit can be implemented with more...
This is a diagram of a 1958 commercial receiver. The circuit was found in documentation at the...