Abstract: The application relates to an ultrasonic transducer comprising a carrier with conductor traces and a piezoelectric element with electrodes, wherein the piezoelectric element has a contact side which is fixed on the carrier, and wherein the conductor traces and the electrodes are electrically coupled via the contact side of the element.

Abstract: A sound transducer and a method for operating a sound transducer are disclosed. In an embodiment a sound transducer includes a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer.

Abstract: In an embodiment an ultrasonic transducer includes an ultrasonic unit with a housing in which a piezoelectric element is located, wherein the ultrasonic unit includes at least one electrical connecting lead leading out of the housing, the connecting lead being configured for connection to control and/or evaluation electronics arranged separately from the ultrasonic unit, and wherein the ultrasonic unit is configured to operate in a thickness oscillation mode.

Abstract: In an embodiment an ultrasonic transducer includes a container having an opening, a base and a wall, a piezoelectric disk arranged within the container on the base, a cover closing the container and an electronics system integrated in the cover, wherein the electronics system makes electrical contact with the piezoelectric disk and is configured to control and to read the piezoelectric disk.

Abstract: An energy harvesting system having at least two piezoelectric units and a central control unit. Each of the piezoelectric units has a piezoelectric layer and an integrated electronics unit, which contacts the piezoelectric layer. The piezoelectric layers are arranged at an angle to one another. Electrical components used to smooth the voltage generated in a piezoelectric layer are built into the integrated electronics unit. The integrated electronics unit contacts the central control unit, which in turn includes a control module and is designed to collect electrical energy from the piezoelectric units. The control module is designed to minimize or to eliminate a reciprocal electrical damping of the piezoelectric units.

Abstract: A sound transducer and a method for operating a sound transducer are disclosed. In an embodiment a sound transducer includes a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer.