This circuit converts signals from the shortwave band to the 118 to 130 MHz VHF band used in aviation. The circuit uses a 55 MHz crystal. We found it in documentation from the 90s.
This circuit appears in several versions on this site. It is designed to be used between the...
This circuit uses a piezoelectric tweeter to emit a powerful continuous sound above the audible...
This circuit is based on a Siemens S566B integrated circuit. The circuit is from a Radio...