This very complex circuit in terms of the number of transistors was found in Radio Electronics from March 1966. The circuit is for low impedance headphones. The transistors are from the time.
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...