Abstract: The present invention concerns a transformer of the ferrite closed magnetic circuit type, with a gap.The gap is filled with a mastic such as the polysulphide or polyurethane mastics having a Shore hardness with constant behaviour as a function of temperature.

Abstract: To obtain a ripple-free direct-current focusing voltage in a split-diode technology high-voltage transformer, the tap is made not at the middle point of the second section of the secondary winding but at a point determined by the ratio of the stray capacitances of the two half-windings of this section, and it is directly linked to a high-value resistor.

Abstract: The high-voltage transformer of the invention is clipped on to its high-voltage lead-out cables. The ends of these cables are held firmly in conductive pads in ducts moulded with the coating of the transformer coil.

Abstract: A device is provided for centering components intended to be implanted in the flat condition and having at least one preformed pin for implantation thereof, the device including two pairs of jaws perpendicular to each other and having recesses for centering the components without damaging the pin during clamping of the jaws.

Abstract: The invention relates to a keyboard having sudden trip tactile effect keys.Such a keyboard comprises a flexible and conducting foil stamped with protuberances, each of them having a central upper flat part, with an area less than the area of the base of the protuberance, and a lateral part, connecting the central part to the base of the protuberance, and comprising or not substantially flat counter-shapes, which is deformed and touches a contact zone of a printed circuit placed therebelow, when a pressure is exerted on the central part.These keyboards find applications in remote-control boxes or else in pocket calculating machines.