A piezoelectric transducer comprising: a first piezoelectric layer (313; 313') made of a non-ferroelectric material, the first layer having a front surface and a rear surface; a first conductive layer arranged on the front surface of the first piezoelectric layer (313; 313'); a second piezoelectric layer made of a non-ferroelectric material arranged on the front surface of the first conductive layer ; a first electrode (A) arranged on the front surface of the second piezoelectric layer ; a second electrode (B) arranged on the rear surface of the first piezoelectric layer (313; 313'), opposite the first electrode (A); a third electrode (C) arranged on the front surface of the second piezoelectric layer ; a fourth electrode (D) arranged on the rear surface of the first piezoelectric layer , opposite the third electrode (C); and a control circuit configured to: in first operating phase, simultaneously apply a non-zero voltage (V A ; S1) to the first electrode (A), a non-zero voltage (V D ; -S1) to the fourth electrode (D), and substantially zero voltages (V B , V C ; S2, -S2) to the second (B) and third (C) electrodes; and in a second operating phase, simultaneously apply a non-zero voltage (V B ; S2) to the second electrode (B), a non-zero voltage (V C ; -S2) to the third electrode (C), and substantially zero voltages (V A , V D ; S1, -S1) to the first (A) and fourth (D) electrodes. a first piezoelectric layer (313; 313') made of a non-ferroelectric material, the first layer having a front surface and a rear surface; a first conductive layer arranged on the front surface of the first piezoelectric layer (313; 313'); a second piezoelectric layer made of a non-ferroelectric material arranged on the front surface of the first conductive layer ; a first electrode (A) arranged on the front surface of the second piezoelectric layer ; a second electrode (B) arranged on the rear surface of the first piezoelectric layer (313; 313'), opposite the first electrode (A); a third electrode (C) arranged on the front surface of the second piezoelectric layer ; a fourth electrode (D) arranged on the rear surface of the first piezoelectric layer , opposite the third electrode (C); and a control circuit configured to: in first operating phase, simultaneously apply a non-zero voltage (V A ; S1) to the first electrode (A), a non-zero voltage (V D ; -S1) to the fourth electrode (D), and substantially zero voltages (V B , V C ; S2, -S2) to the second (B) and third (C) electrodes; and in a second operating phase, simultaneously apply a non-zero voltage (V B ; S2) to the second electrode (B), a non-zero voltage (V C ; -S2) to the third electrode (C), and substantially zero voltages (V A , V D ; S1, -S1) to the first (A) and fourth (D) electrodes. in first operating phase, simultaneously apply a non-zero voltage (V A ; S1) to the first electrode (A), a non-zero voltage (V D ; -S1) to the fourth electrode (D), and substantially zero voltages (V B , V C ; S2, -S2) to the second (B) and third (C) electrodes; and in a second operating phase, simultaneously apply a non-zero voltage (V B ; S2) to the second electrode (B), a non-zero voltage (V C ; -S2) to the third electrode (C), and substantially zero voltages (V A , V D ; S1, -S1) to the first (A) and fourth (D) electrodes. <EOS>