This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
This simple demonstration circuit was found in a Popular Electronics of the 1980s. It can be...
This circuit converts a resistance in the range between 1 k ohm and 1 MΩ to a signal in a...
The signal itself captured by the (long) antenna serves to feed this simple experimental circuit....