This circuit was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz signals and values in parentheses for FI of 455 kHz. The circuit can be adapted to other frequencies.
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single...
This configuration appears elsewhere on this site. We obtained it from a 90s Radio Electronics, based...
This circuit, found in a 1956 Sylvania publication, was indicated to serve as a frequency...