This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
This self-oscillating voltage conversion circuit was found in an American 1980s documentation. The MOSFET...
This high-performance circuit was found in the 1982 SGS Linear Integrated Circuits Manual. The...
This is a very simple configuration with a power transistor to control a DC motor from 3 to 12 V...