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.
The intensity of an audio signal can be controlled by a remote potentiometer on a DC circuit,...
This alarm circuit is from a 1987 publication, however the components used are still modern. The...
This voltage-controlled function generator circuit was found in ancient European documentation. The circuit...