We found this circuit in a Popular Electronics from 1992. The transistor is general purpose, assuming equivalent.
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
This dual-gate FET RF signal mixer circuit was found in a 1980s documentation. The circuit is...
This circuit for medium and short-wave ranges, according to the transistor used, was obtained in...