Abstract: An electric appliance comprises a component part (101) that comprises electronic components, among which is an electrolytic capacitor (105). A molded part (301) is molded around the component part (101), An outer surface of the molded part (301) constitutes at least a part of the outer surface of the electric appliance. The molded part comprises a cavity (302), which contains something else than electronic components or connections between electronic components. The cavity (302) is separated from the electrolytic capacitor (105) by at most a wall the thickness of which is smaller than a mean material thickness of the molded part (301) between the component part (101) and outside of the electric appliance.

Abstract: A switched-mode power supply has primary and secondary sides, and a transformer (M1) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary winding are connected to the primary side, and the secondary winding is connected to the secondary side. A switch element (T3) is connected to the primary winding in order to interrupt a current flowing in the primary winding. The switched-mode power supply contains a freely oscillating circuit (R5, C3, R7, T1, T2, R8, R9, R10, R11) for generating switching pulses to the switch element (T3). A rectifying and charge storing coupling (D4, C5) is connected between the terminals of the auxiliary winding in order to generate such an image voltage which on the primary side represents a certain voltage of the secondary side.

Abstract: A switched-mode power supply has primary and secondary sides, and a transformer (M1) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary winding are connected to the primary side, and the secondary winding is connected to the secondary side. A switch element (T3) is connected to the primary winding in order to interrupt a current flowing in the primary winding. The switched-mode power supply contains a freely oscillating circuit (R5, C3, R7, T1, T2, R8, R9, R10, R11) for generating switching pulses to the switch element (T3). A rectifying and charge storing coupling (D4, C5) is connected between the terminals of the auxiliary winding in order to generate such an image voltage which on the primary side represents a certain voltage of the secondary side.

Abstract: A power supply arrangement comprises a primary side and a secondary side. There is a power transformer between the primary side and the secondary side. On the primary side certain switching means are arranged to repeatedly switch, at a certain frequency, an electric current coupled into the power transformer for cyclically transferring energy from the primary side to the secondary side at said certain frequency. A wireless feedback link exists between the primary side and the secondary side. On the secondary side there are feedback pulse generating means for generating feedback pulses at a certain frequency to be transferred from the secondary side to the primary side over the wireless feedback link. On the primary side there are means for utilizing the feedback pulses in controlling the rate at which energy is transferred from the primary side to the secondary side.

Abstract: A method and a circuit for generating the control voltages of the dynamic convergence in a color display tube, in which the current of the convergence coils (HC, VC) is controlled. The control voltages for the convergence coils (HC, VC) are obtained from several controlling means (1-16). A voltage independent of the horizontal and vertical deflection frequencies is switched to the control means.(1-16). The voltage from each controlling means (1-16) is switched to the coils (HC, VC) by signals (f.sub.ch, f.sub.cv) synchronized to the horizontal and vertical deflection pulses (f.sub.h, f.sub.v), whereby the convergence of different parts (a1-a16) of the display is controlled by a voltage provided by a separate controlling means (1-16).

Abstract: The object of the disclosure is a method and a coupling for decreasing the alternating current field produced by a cathode-ray tube in the environment. The said field or radiation is at least partly due to the capacitances (C1, C2) of the anode (A) with respect, on one hand, to the deflection coil (DY) and, on the other hand, to the ground. These capacitances produce, mainly because of the return pulse of the deflection coupling, a line rate noise voltage to the anode. According to the invention, a back-off voltage (U.sub.2) opposite to the noise voltage is fed to the anode (A) of the tube either directly or via a graphitizing (G). In cases where the same high-voltage transformer (TR) functions for both the high voltage of the anode and the horizontal deflection, the winding (L) of this transformer can also be used in generating the back-off voltage (U.sub.2). The back-off voltage can thus be coupled to the anode (A) via the high-voltage capacitor (C3) of the transformer.