This bandpass filter has a simple feedback system. The component values can be calculated using the formulas found in the math section.
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...