Transistorized AM radio (CB8392E)

Found in a 1980s amateur radio QST magazine, this is the conventional circuit of a medium-wave radio. Coils and transformers are commercial types.

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Electronic Fuse (CB10445E)
This circuit was published in an Italian magazine Radio Elettronica in February 1976. The...
35 to 5 V symmetrical converter (CB8176E)
Found in a Popular Electronics from the 90's, this circuit converts a 40 V symmetrical source to a 5...
Selective tone decoder (CB3957E)
This high selectivity circuit for single tone decoding was found in 1970s documentation. The coil...