Abstract: A cleaning device for an object, such as a pet foot, has a housing to which a cover plate is attached. The cover plate has an opening to enable insertion of an object into the cleaning device. The cleaning device further has a first rotatable brush arranged in the housing and having a first axis, and a second rotatable brush arranged in the housing and having a second axis. When an object is inserted through the opening, the object is drawn into the cleaning device in a direction from the opening by means of the rotation of the rotatable brushes.

Abstract: A self-igniting thyristor has a zener diode integral with the thyristor, which zener diode bridges the central junction of the thyristor and the breakdown voltage of which determines the breakover voltage of the thyristor. The breakdown voltage of the zener diode is determined by the field geometry in that part of the PN junction of the zener diode which is located near the surface of the semiconductor body, where the breakdown is arranged to take place. A conducting screen is arranged over said portion of the PN junction of the zener diode and is separated from the underlying portion of the surface of the semiconductor body by an insulating layer. The thyristor is provided with means for influencing the potential of the screen, which in turn influences the field geometry and thus the breakdown voltage of the zener diode and the breakover voltage of the thyristor.