This receiver was found in an article in Electronics Now magazine in March 1994. The coils are critical, as shown in the figure. Listening is through headphones.
This circuit is suggested by the 1982 SGS linear integrated circuit manual. The plate is given next...
This two-transistor delay circuit from the 1960s was found in documentation from the time....
This shield circuit is from an American documentation from 1969. The components can be modified...