This converter has coils according to the reception and converted frequency bands. We found it in the October 1989 Radio Electronics magazine in an article that teaches its construction.
This stage of IF to 455 kHz operates with voltages from 1.5 V. We find it in a 90s Popular...
The CMOS 4046 integrated circuit is seldom used, both due to the difficulty of finding it and the...
This different configuration for a crystal galena radio or modernized since a diode is used, has a...