This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968 documentation. The integrated circuit is difficult to obtain today.
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...