Abstract: A miniature trimmer resistor has a resistor carrier with resistive path deposited thereon and solder contacts electrically connected to the resistive path. The resistor carrier and solder contacts are formed by means of a single film of electrically insulating material. This film is covered or coated with electrically conductive material in the region of the solder contacts and printed with a resistive enamel in the region of the resistive path.

Abstract: Apparatus for mounting an electrical component actuated by a rotating spindle (e.g., a potentiometer or a selector switch) having a cross-slide guideway made of two slide components wherein a first slide component is displaceable relative to the second slide component. The second slide component is displaceable relative to the object on which the component is to be supported. The two displacement directions are off-set 90 degrees from each other and extend radially with respect to the axis of rotation of the electrical component.

Abstract: A potentiometer which is adapted to be produced fully automatically includes a spring support (2) formed in one piece by injection molding of plastic material and given such configuration that it embraces such functional members as the slider spring (3), resistor plate (5), and base plate (6). The casing (1), is also molded in the same working operation. The casing (1) and spring support (2) are interconnected by a sprue lug (7) which is removed by shearing.

Abstract: The cover of a casing of the potentiometer is formed with an opening which is adapted to be closed by another cover and through which the top surface of a resistor core is accessible. Trimming resistors are located on the top surface and are connected electrically to a resistor path applied on the bottom surface of the resistor core. This permits adjustments of the potentiometer to be made even when the assembly is completed.

Abstract: A potentiometer for attachment to objects undergoing strong vibrations, such as the engine block of an internal combustion engine has an outer housing which is secured to the object and an inner housing which is largely positioned inside the outer housing. The two housings are connected by at least one springy damping member, such as an O-ring made of rubber and, at the same time, they are largely uncoupled with respect to vibrations.

Abstract: The potentiometer consists of two halves. Each half has a base plate (5,6) ending in soldering lugs (51,61,62). One part each of a casing (1 or 2) and a rotary driver half (3 or 4, respectively) are molded to each base plate in a plastics injection molding process. The two potentiometer halves are interconnected at their casing parts (1,2), on the one hand, and at their rotary driver halves (3,4), on the other hand, by ultrasonic welding. For this purpose a circumferential thickening (15,47) each is provided of tapering shape. A slider spring (8) on the one hand has slider lobes (81) which slide on a resistor path of a resistor plate (7) and, on the other hand, slider lobes (80) which slide on the base plate (5) opposite the resistor plate (7). Hereby the central or potentiometer tapping is effected electrically at this base plate (5) and the soldering lug (51) connected to the same.

Abstract: The electronic remote control means operates according to the known principle of code stepping through which a different code word is used after each transmitting/receiving operation. In accordance with the invention the respective new code word is produced anew by linking according to a given function, starting from a stored original code word and the previous code word. In case of non-agreement between the code word received and the new code word determined at the receiver additional code words are produced in sequence at the receiver. Thereafter, if no agreement results, the receiver switches over to an increased security mode wherein two successive code words in sequence must be successfully compared.

Abstract: A potentiometer has a substantially rectilinear slide spring (2) which rests on a defined inclined support surface (4) of the spring carrier (1), being supported, in one direction, at the front edge (7) of this support surface and, in the other direction, projecting into a recess (5) of the spring carrier serving as a thrust bearing for the vertical force. The slide spring (2) is anchored firmly on the spring carrier by means of a tongue (12) bent upwardly and by a post (13) of the spring carrier.

Abstract: In an effort to reduce the number of "terminal legs" in highly integrated electronic circuits, two different kinds of coded signals are applied successively to the control terminals thereof, namely: binary coded signals applied in parallel and successive pulses. An evaluation is made only of pulses applied to selected terminals, and a different number of pulses is applied to the individual control terminals. The total number of pulses evaluated is counted in a counter. The counter outputs are decoded in a decoder. The binary coded signals also are decoded in a decoder, and the outputs of both decoders are combined in a selection logic so that both kinds of signals together define a control state. In this manner 3.sup.n different control states are obtained by a number n of control terminals.

Abstract: A trimming resistor is provided including a housing formed with a central through bore in which a rotary driver is supported for rotation. The rotary driver supports a spring ring which has a resilient tongue to press a small contact plate against a resistance plate provided with brush tracks. The rotary driver interfits with the spring ring as well as the small contact plate.

Abstract: The switching contact arrangement contains a support or base (1), above it a layer of at least two tracks approaching each other at an angle, one of which comprises a switching contact surface (11). The other one (13, 13') is divided in the region of the switching contact surfaces (11) and their track sections, so that a space is formed there. An insulating layer is provided in the region of the track intersection to be formed. A layer (30) of electrically conductive material is then applied thereto, which has a recess in the region of the switching contact surfaces (11). This layer also serves as a bridge for the track intersection and as a switching contact surface for a switching surface (41 or 43) arranged thereabove and made of a flexible, electrically conductive material. In addition, the electrically conductive layer (30) serves as a spacer for the switching surface (41). A particularly compact switching contact arrangement is provided by integrating the switching contact surface and the bridge.

Abstract: A multi-layer conductor plate consists of a copper-clad base plate (1) on which a first layer of conductor paths (2,3,4; 5,6,7) is formed by applying an etch-resistant, electrically conductive varnish at the respective locations. The copper layers not covered by the etch-resistant varnish are removed by etching in etching bath. Subsequently an insulating varnish layer (16) is applied at least in the area of intersections of conductor paths of the first layer and a second layer. A varnish adapted to be galvanized and preferably being carbonaceous is applied at predetermined locations and subsequently coated with a metal layer applied galvanically.

Abstract: An electrical slide switch comprising spring-action mechanics (5) overcomes the problems of fused contacts (3,6) caused by high starting currents by the provision of disconnecting mechanics (2,9) which positively separate the rocking arm (3) from its associated contact (6) as the switch is turned off. Preferably the disconnecting mechanics does not act on the rocking arm until shortly before the switch-off end position of the slide switch is reached. The disconnecting mechanics preferably consists of an insulating material lever (9) which is pivoted by a pin (11) of the slide member (2) against the force of a spring arm (22), the insulating material lever (9) having a lug (12) which protrudes into the path of pivoting movement of the rocking arm to positively move the same.

Abstract: A process for producing printed boards for electrical circuits in the case of which copper-coated board material is printed with an etch resist or etch resistant lacquer is representative of printed wiring to be produced, and after the curing of the etch resist, the copper layer is etched away at positions where it is not resist-covered. The etch resist is electrically conducting.In a further development of the invention non-conducting etch resist is used for making crossovers of the printed wiring of a multi-layer printed board.

Abstract: A circuit board and a method of making same having a plurality of conductor lines wherein at least one portion of at least one line is superimposed over a portion of at least one other line to define at least one intersection. A substrate is provided of insulating material and a first insulating coating is applied to at least one side of the substrate. A first set of conductive nonintersecting lines is applied to the varnished coating and a coating of insulating varnish is applied on and around the conductive lines only in the vicinity of the intersection. A second set of nonintersecting conductive lines define the intersection with the first set by being applied onto the substrate. The circuit board may be used in a multiple circuit keyboard switch assembly. A conventional type pushbutton bridging contact array selectively interconnects conductor lines at particular switch sites.

Abstract: A tuning unit with a bandswitch for high frequency receivers having a potentiometer system for the control of capacity diodes is disclosed. The potentiometer system includes a plurality of parallelly disposed resistance paths on which wipers can be moved by means of screw tuning spindles mounted beside one another in a common housing made of an insulating material. The bandswitch is formed of metal wires and is associated with each tuning spindle. The tuning spindles are joined for rotation with sleeves simultaneously forming the operating knobs which are carried in apertures in the front plate and each have a flange engaging the back side of the front plate about the apertures. The flange is slightly larger than the cross section of the apertures and tapers conically away from the back side of the front plate.

Abstract: Attenuation equalizer in the circuit of an adjustable four-terminal network for correcting the frequency-related attenuation curve of cables including a bridged T circuit containing ohmic resistances and having two fixed ohmic series resistance, preferably of equal resistance value, bridged by a bridging impedance, the bridging impedance being a series-resonant circuit having an inductance, a condenser and a variable parallel resistance wherein the shunt impedance is a parallel-resonant circuit having an inductance, a condenser and a variable series resistance, the latter being adjustable by means of a common traversing device.

Abstract: A trimming potentiometer in which three parallel resistance paths are located in a plane on an insulating plate. Wiper contacts are displaceable in the same direction on the resistance paths, and are attached to a common carrier which is longitudinally displaceable by a threaded spindle. Inductance loops are arranged between the resistance paths and the respective terminals for the paths, for the purpose of matching the trimming potentiometer to its inductance and capacitive input and output values.