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 causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
Found in American documentation from the 90s, this circuit can measure frequencies on a linear...
This frequency modulated light transmitter is from a 1990s documentation. The circuit may use...