Abstract: This invention concerns a coil form with integral comb-like fins at least on one end, between which contact elements are placed that can be connected with the winding ends of the windings. Each contact element is held by the fastening grooves of two adjacent fins. In order that all connecting points can be made in the same, universal fashion, independent of the wire diameter of the individual winding leads, the contact elements are provided with a "U"-shaped receiving channel running parallel to the coil form axis. This receiving channel can be closed by a cover and can be ultrasonic welding to the walls of the receiving channel and to the winding ends inserted therein.

Abstract: For the recovery of uranium from a solution in which the uranium is in valence (VI), a solution is formed containing ammonium (NH.sub.4.sup.+), fluoride (F.sup.-) and sodium hydrosulfite (Na.sub.2 S.sub.2 O.sub.4). This forms a precipitate (NaNH.sub.4 UF.sub.6), a previously unreported compound. It can be dissolved in an aqueous solution of nitric acid, aluminum nitrate nonahydrate, Al(NO.sub.3).sub.3.9H.sub.2 O, or a mixture of the two. This produces uranyl nitrate hexahydrate, which can be purified by processes conventionally used for that purpose.

Abstract: This invention concerns an inductive proximity switch having an oscillator and a resonant circuit which is dampable by outside objects, as well as an electronic switch controllable by the voltage across the resonant circuit. From the signal of the electronic switch a switching hysteresis is derived. A device for changing the frequency, when the resonant circuit is damped, as a function of the signal of the electronic switch allows the adjustment of the hysteresis in such a way that there is essentially no effect on the sensitivity of the oscillator.

Abstract: A brushless exciter is provided for controlling excitation of a synchronous motor. The brushless exciter uses a center tapped rotating transformer, a discharge resistor, a field winding which has one end coupled to the ends of the rotating transformer and the other end connected to the discharge resistor and center tap of the rotating transformer. Four power SCR's are used in the brushless exciter. The electronics for controllably firing the SCR's and applying and removing the field are arranged in modules. A field current regulator module is located externally of the rotating apparatus for external control and contains circuitry for field forcing. The circuitry controls the application of field current and the level of excitation. The circuitry monitors the presence, frequency and phase angle of the discharge current and determines the time for field application and removal.

Abstract: A disconnect switch, suitable for various conductor runs within a section of a metal-clad, gas-filled, high-voltage switchgear, with shielding bodies enclosing the ends of the conductors, is operated through a rotating insulator shaft that is perpendicular to the plane of the phase-current path of the section. One shielding body is made approximately in the shape of a sphere, whose center lies on the axis of the rotating insulator shaft and on the longitudinal axis of a movable switch contact. In the interior of the sphere there are one or more surfaces to accept a connecting means necessary for connection with the end of a first conductor. The mid-perpendiculars of each of the connection surfaces lie in the plane of the phase-current path. The isolating gap also lies in the path of an angled second conductor.

Abstract: A coil body is provided for a small synchronous motor with a stator housing surrounding the wound coil body. The winding ends and the connector ends are soldered to the connector pins which are fastened to the one frontal flange of the coil body with a radially overhanging connecting end. The overhanging connecting end with the soldered-on winding and connecting line ends are bent inwards towards the other frontal flange and are overlapped by a swivel cover with slot openings hinge-mounted on the other facing frontal flange in which the connector pins can be held in place to relieve the strain and insulate them from the surrounding stator housing.

Abstract: A thermally released switching mechanism which in a simple fashion and at a precisely defined switching point clearly interrupts the current to the motor when a preset, highest admissible temperature is exceeded, at least until the actual temperature has once against fallen below the highest admissible temperature. The thermally released switching mechanism is comprised of a lever element made of a memory element which, upon exceeding the highest permissible temperature set value, lifts the brush from a commutator or a slipring. This mechanism preferrably employs a memory element with a two-way effect. This thermal switching mechanism is suitable both for commutator motors with hammer or tubular brush holder systems as well as for slipring motors.

Abstract: A fully differential CMOS operational amplifier (10) of the folded cascode type has a differential input network (12) and a transimpedance stage (14). The transimpedance output stage (14) is made up of two similar negative and positive signal branches (32,34) connected in parallel with each other between supply voltage nodes (V+,V-). Each signal branch includes a P-channel current source transistor (48,60), a cascode transistor (50,62), an N-channel a pull-down transistor (40,52), and an N-channel current source transistor (42,54), all connected in tandem, respectively, between a positive supply voltage node and the drain of a feedback transistor (44,56), which has its source connected to a negative supply voltage node. The drains of the feedback transistors of the two branches are joined.

Abstract: A fully differential CMOS operational amplifier (10) of the folded cascode type includes two similar signal current branches (32,34) connected in parallel between two supply voltage nodes (V+,V-). Each branch includes an N-type bias current transistor (42,54), a P-type cascode transistor (50,62), an N-type pull-down transistor (40,52), and a P-type current source transistor (48,60), all connected respectively in series between the drain of an N-type common mode suppression feedback transistor (44,56) and the drain of a P-type common mode suppression feedback transistor (46,58). The N-type feedback transistor has its source connected to a negative supply voltage node. The P-type feedback transistor has its source connected to a positive supply voltage node. The gates of the feedback transistors of each branch are connected to the output node (36,38) at the drain of the cascode transistor. The gates of the other transistors are supplied with appropriate reference voltages (V.sub.B1, V.sub.B2, V.sub.B3, V.sub.

Abstract: A transconductance circuit (10) has its signal input terminals (28,40) at the gates of a pairs of MOSFETS (16,22; 32,38) which are forced to operate in the triode mode. The outputs of the triode mode MOSFET pair are fed to a cascode transistor (18,20; 34,36) for treatment as a differential signal. The differential output (30,42) of the cascode transistors is highly linear with respect to the input signal at the gates of the triode mode transistors. Bias voltages for the gates of the cascode transistors are generated by a bias network (14). The transconductance circuit 12 includes a cross-coupled set of compensation capacitors (62, 64; 66, 68) formed from devices with the same geometries as the triode mode transistors to compensate for high frequency loss due to the Miller effect in the input transistors.

Abstract: A drive mechanism for a circuit breaker has a spring which is to be tensioned by means of a shaft. On said spring sits a clamp-roll freewheel as a directional lock, whose outer part is connected via a flexible strip traction member to one or more eccentric members. The clamp rollers can be pressed out of their operating position by means of cage disks, which occurs upon reaching the end position of the spring-tensioning shaft by means of a release lever in connection with toggle levers.

Abstract: A transformer of small installed volume which affords, besides electrical separation, also an effective static protective shield between the power supply side and the user side, along with simple production and assembly. To accomplish this, a two-chamber transformer with a coil form for the primary winding and a coil form for the secondary winding, both plugged one behind the other onto the transformer core in the direction of the coil axes and a stamped metal foil frame as the shielding wall between the adjacent face flanges of the coil forms are used. The transformer is particularly well suited for application in equipment of the entertainment, communications and medical technologies.

Abstract: A capacitive keypad (24) is scanned in such a manner that the capacitance value (C) of an individual key in a given row is multiplied by the sum of the relative capacitance values of all the other keys in the same row by means of an amplifier (32) to generate a combined pulse. The combined pulse is then compared by a comparator (28) to a threshold voltage (Vref 3) to verify whether the individual key in question is in the closed or open position. The verification can be made independently of keypad-to-keypad variations in the capacitances of the keys, since the combined pulse value does not depend upon the absolute capacitance value of the keys, but only upon their relative values. Also disclosed is a method for scanning to determine the presence of multiple key closures.

Abstract: A protection circuit for use with a thyristor having several break over diode, BOD, elements is connected between the anode and the gate of a thyristor providing static and dynamic overvoltage protection. With the exception of the BOD element connected to the gate, all the BOD elements have RC circuits connected in parallel, whose respective resistance and capacitance values are essentially identical. The BOD element connected to the gate and the cathode-gate portion of the thyristor has an additional RC circuit connected in parallel, whose resistance value is smaller or the same and whose capacitance value is smaller than the respective resistance and capacity values of the other RC circuits. Preferably, in this last RC circuit the resistance value is very small in contrast to the resistance values of the other RC circuits, and the capacitance value is negligible.

Abstract: This invention is of an ultrasonic proximity switch having a range selection control circuit. The range selection control circuit is in this instance separated from the sensor by being installed in a separate housing which can be mounted in the switching unit. It is equipped with a potentiometer in the form of encoding switches and an actual value display which can be designed in the form of an LCD design. In addition, various selector switches can be mounted in the housing.

Abstract: A contact assembly is provided for current-limiting low-voltage circuit breakers. The contact assembly has a two-armed contact lever swivel-mounted on a central bearing pin whose lever arms are equipped at their ends with contact pieces. The contact lever is equipped with a slot for mounting on the bearing pin whose longitudinal axis extends approximately at a right angle to the longitudinal axis of contact lever. The contact lever has a stop extending at approximately a right angle to its longitudinal axis for a catch swivel-mounted on the bearing pin. The contact forces on both lever arms cannot be influenced by the swivel mount or by the drive mechanism of the contact lever, but are determined exclusively by the biasing springs.

Abstract: An MOS differential input stage circuit (10) includes first (M1) and second (M2) differential input transistors with input nodes at their gates and output nodes at their drains. The sources are connected to a first current source (24). A second pair of differential transistors (M3,M4) which have their sources connected to a second current source (28), their drains connected to a reference voltage node, and their gates common to the respective first differential input transistors, have their bulk regions in common with the bulk regions (20) of the first differential transistors for isolation from supply voltage noise and from common mode input signal effects.

Abstract: The front end of an optical receiver circuit (10) is of the type having a field-effect device transimpedance amplifier (16,21) which receives at its input (14) the photocurrent of a photodiode (12). A field-effect device shunt impedance (26) to protect against amplifier overloading is connected between the input and ground through a decoupling capacitor (28). The shunt (26) is controlled by a controller (30), which has its input connected to the output (24) of the amplifier (16) and its output connected to the gate of the shunt (26). The controller (30) compares the output (24) of the amplifier (16) to a threshold reference voltage for determining whether to activate the shunt (26) and regulates the gate voltage of the shunt (26) by means of an AGC amplifier. A direct current feedback resistor (32) is connected between the output (24) of the amplifier (16) and the source of the shunt (26). This prevents the d.c.

Abstract: An electronic oscillator wafer crystal (42, 54) mounting assembly (10, 48) includes an insulating thermoplastic mounting block (12) with top and bottom faces (16, 18). Three terminals (22, 50), radially spaced at 90 degrees with respect to each other around the center of the block have shank segments (24) pressed into receiving apertures (18) in the bottom face. Fingers (26) of the terminals extend around the edge of the block to hold the crystal spaced from, and closely adjacent to the top face by supporting it at a perimeter portion on a step-shaped crystal support segment (36) of the finger. A segment (30) of the fingers adjacent and parallel to the bottom face is adapted for conductive attachment to a circuit.

Abstract: The circuit (10) has a gain section which includes a first AGC circuit (12). The output of the gain section goes to a signal shaping section which includes a biquadratic filter (24), a summer (45), and a second AGC circuit (40). The two AGC circuits (12,40) are controlled by respective separate peak detectors (20, 50) and are noninteracting. For "short" cables, only the first AGC circuit (12) is active. For "long" cables, the first AGC circuit (12) is set at its gain breakpoint and the second AGC circuit (40) alone has active control. The shaping section includes a biquadratic filter (24) which is a tandem arrangement of a low-pass filter (26), an inverter (28), and an integrator (32). The low pass output (35) of the integrator (32) is connected to the noninverting (+) input of the a summing amplifier (45). The input (42) of the second AGC circuit (40) is connected to the band pass output (33) of the inverter (28), while its output (44) is connected to the inverting input (-) of the summing amplifier (45).