An electronic amplifier is characterized by a first stage (1) controlled by an input voltage UE, the operating voltage of said stage being on positive and/or negative potentials (V1+/V1A−), which are always constant with respect to the input voltage (UE), and further by a second impedance-converting stage (2), which is controlled by a voltage supplied by the first stage (1) and the operating voltage of which is on positive and/or negative potentials (V5+/V5A−), which are always constant with respect to the voltage supplied by the first stage (1).