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 from the 40's is a conventional analog multimeter with several scales. Its accuracy will...
With this circuit, an external circuit can be controlled by turning it on or off and reversing it (if...
This circuit appears elsewhere on this site, but from different sources. Using the LM3900, we find this...