This dual-gate FET RF signal mixer circuit was found in a 1980s documentation. The circuit is intended for applications in superheterodyne receivers of the time.
This circuit is suggested by the 1982 SGS linear integrated circuit manual. The plate is given next...
This two-transistor delay circuit from the 1960s was found in documentation from the time....
This shield circuit is from an American documentation from 1969. The components can be modified...