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.
No information was given on the inductor enrolled in the common core of this circuit two years 80. The...
This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an...
Originally suggested by Popular Electronics to control Christmas lights, this circuit can...