An electric circuit with one power amplifier for at least two piezoelectric actuators (C1, C2), the at least two piezoelectric actuators (C1, C2): - being in preferably antagonist arrangement connected mechanically in series and being connected electrically with each other through a first junction point between two first terminals of the piezoelectric actuators (C1, C2), - being operated by the one power amplifier commanded by a control circuit for time-variant energizing of the at least two piezoelectric actuators (C1, C2) in push-pull fashion, said power amplifier having a first terminal which is grounded and a second terminal connected to the first junction point between the first terminals of the piezoelectric actuators (C1, C2), said electrical circuit further comprising a one-directional diode whose anode is connected to the first junction point and therefore to the second terminal of the power amplifier and to the first terminals of the at least two piezoelectric actuators (C1, C2), characterized in that: - the cathode of the diode is connected to a second junction point to which a first terminal of a first buffer capacitor and a first terminal of a first static resistor, said first buffer capacitor and said first static resistor being connected in parallel to each other, are also connected, - the second terminal of the first buffer capacitor and the second terminal of the first static resistor are connected to a third junction point to which a first terminal of a second buffer capacitor and a first terminal of a second static resistor, said second buffer capacitor and said second static resistor being connected in parallel to each other, are also connected, - the second terminal of the second buffer capacitor and the second terminal of the second static resistor are grounded, - the third junction point is also connected to a first terminal of at least one protection resistor, whose second terminal is connected to the second terminal of the at least one piezoelectric actuator, with the second terminal of the at least one other piezoelectric actuator being grounded. - being in preferably antagonist arrangement connected mechanically in series and being connected electrically with each other through a first junction point between two first terminals of the piezoelectric actuators (C1, C2), - being operated by the one power amplifier commanded by a control circuit for time-variant energizing of the at least two piezoelectric actuators (C1, C2) in push-pull fashion, said power amplifier having a first terminal which is grounded and a second terminal connected to the first junction point between the first terminals of the piezoelectric actuators (C1, C2), - the cathode of the diode is connected to a second junction point to which a first terminal of a first buffer capacitor and a first terminal of a first static resistor, said first buffer capacitor and said first static resistor being connected in parallel to each other, are also connected, - the second terminal of the first buffer capacitor and the second terminal of the first static resistor are connected to a third junction point to which a first terminal of a second buffer capacitor and a first terminal of a second static resistor, said second buffer capacitor and said second static resistor being connected in parallel to each other, are also connected, - the second terminal of the second buffer capacitor and the second terminal of the second static resistor are grounded, - the third junction point is also connected to a first terminal of at least one protection resistor, whose second terminal is connected to the second terminal of the at least one piezoelectric actuator, with the second terminal of the at least one other piezoelectric actuator being grounded.