Found in a 1980s amateur radio QST magazine, this is the conventional circuit of a medium-wave radio. Coils and transformers are commercial types.
This circuit is from an old technical documentation from Spain. The circuit uses a FET that is...
Found in a documentation from the 90's, this circuit already includes an amplification stage. The...
This circuit, called Kames Dandy, can mix signals from a wide range of frequencies and is...