Found in an English publication from the 1980s, this circuit can be built with equivalent transistors such as the BC549. The signal must be applied to an external amplifier.
This phase inverter with transistors, used in audio amplifiers, was found in a French publication from...
With the illustrated circuit we can run a DC motor in one direction or the other, depending on...
Motors up to 2 A DC can be controlled by this circuit that we find in the manual for linear...