A control device controls a switching converter that converts an alternating supply voltage to a regulated voltage and comprises a switch connected to an inductor. The 3D articles are capable of displaying rear projected images, effectively as a 3D \u201cscreen\u201d for displaying an image or a movie. Thus, contact areas between the engaging portions and restricting surfaces of the housing increase, and forces acting on the contact surfaces are distributed. When the electronic subsystem is operatively inserted into the container and coolant is pumped through the container, the multiple different types of components of the electronic subsystem are immersion-cooled by the coolant. Treatment of tumors with a combination of electroporation using the apparatus of the invention, and a chemotherapeutic agent, caused regression of tumors in vivo. The characteristic feature of the invention is that the turns include a magnetic material or the turns have an outer layer for carrying an electric current and have a magnetic material in their interior.