N74-21851* National Aeronautics and Space Administration. Ames Research Center, Moffett Field, Calif. BIO-ISOLATED dc OPERATIONAL AMPLIFIER Patent Robert D. Lee, inventor (to NASA) Issued 14 May 1974 4 p Filed 30 Jun. 1972 (NASA-Case-ARC-10596-1; US-Patent-3,811,094; US-Patent-Appl-SN-267862; US-Patent-Class-330-59; US-Patent-Class-330-28) Avail: US Patent Office CSCL 09E A bio-isolated dc operational amplifier is described for use in making bioelectrical measurements of a patient while providing isolation of the patient from electrical shocks. The circuit contains a first operational amplifier coupled to the patient with its output coupled in a forward loop through a first optic coupler to a second operational amplifier. The output of the second operational amplifier is coupled to suitable monitoring circuitry via a feedback circuit including a second optic coupler to the input of the first operational amplifier. Official Gazette of the U.S. Patent Office CHANNEL N T N74-22864* National Aeronautics and Space Administration. Lewis Research Center, Cleveland, Ohio. LOAD INSENSITIVE ELECTRICAL DEVICE Patent Francisc C. Schwarz, inventor (to NASA) Issued 30 Apr. 1974 15 p Filed 6 Nov. 1970 Continuation-in-part of US Patent Appl. SN-810579, filed 26 Mar. 1969 (NASA-Case-XER-11046-2; US-Patent-3,808,511; US-Patent-Appl-SN-87597; US-Patent-Class-321-45R; 09A A class of power converters is described for supplying direct current at one voltage from a source at another voltage. It includes a simple passive circuit arrangement of solid-state switches, inductors, and capacitors by which the output voltage of the converter tends to remain constant in spite of changes in load. The switches are sensitive to the current flowing in the circuit and are employed to permit the charging of capacitance devices in accordance with the load requirements. Because solid-state switches (such as SCR's) may be used with relatively high voltage and because of the inherent efficiency of the invention that permits relatively high switching frequencies, power supplies built in accordance with the invention, together with their associated cabling, can be substantially lighter in weight for a given output power level and efficiency of operation than systems of the prior art. Official Gazette of the U.S. Patent Office US-Patent-Class-307-215; US-Patent-Class-307-290; 178 A selection switch with high isolation between RF signal input terminals is achieved with a gated Schmitt trigger circuit feeding into a control NAND gate in each signal switching channel. The control NAND gates of the separate signal channels are coupled to an output terminal by a single NAND gate. The schmitt trigger circuits and all gates are implemented with Schottky transistor-transistor logic circuits having input clamping diodes. Each Schmitt trigger circuit includes two cascaded NAND gates and a feedback isolation Schottky diode between one input terminal connected to receive an RF input and another input terminal connected to receive a feedback signal from the An electrical wire is reported along whose length loops are formed at intervals and retained in a plastic capsule that allows unfolding of the loop when tension is exerted on the opposite ends of the wire. The capsule is formed by encompassing each loop with a sleeve of heat shrinkable synthetic plastic material which overlaps the loop and heat shrinking the overlapping portions. Thus, a length of electrical wire is formed which stores extra lengths of wire in the quantity needed to match the expected stretching of materials or elements such as ropes, cords and the like of high elongation to which the electrical wire may be attached. Official Gazette of the U.S. Patent Office (NASA-Case-MFS-21698-1; US-Patent-3,815,048; 6 P Avail: A stable excitation supply for measurement transducers is described. It consists of a single-transistor oscillator with a coil connected to the collector and a capacitor connected from the collector to the emitter. The output of the oscillator is rectified and the rectified signal acts as one input to a differential amplifier; the other input being a reference potential. The output of the amplifier is connected at a point between the emitter of the transistor and ground. When the rectified signal is greater than the reference signal, the differential amplifier produces a signal of polarity to reduce bias current and, consequently, amplification. Official Gazette of the U.S. Patent Office A voltage controlled phase shifter is rendered substantially harmonic distortion free over a large dynamic input range by employing two oppositely poled, equally biased varactor diodes as the voltage controlled elements which adjust the phase shift. Control voltages which affect the bias of both diodes equally are used to adjust the phase shift without increasing distortion. A feedback stabilized phase shifter is rendered substantially frequency independent by employing a phase detector to control the phase shift of the voltage controlled phase shifter. 1224 32 84 83 86 88 +12V 102 104 +12V 108 100 -12V 106 90 N74-26977* National Aeronautics and Space Administration DEVICE FOR CONFIGURING MULTIPLE LEADS Patent A device for simultaneously configuring multiple leads projected from a printed circuit affixed to a circuit board is described. The device is characterized by a receptacle adapted to receive and support a circuit board having multiple leads, a first locking mechanism for securing the base portion of the leads against motion relative to the circuit board, and a second locking mechanism, spaced from the receptacle and mounted on a carriage for securing the distal end portions of the leads relative to the carriage. The carriage, in turn, is supported for a simultaneous motion in vertical and horizontal planes for imparting selective motion to the carriage, so that leads secured by the (NASA-Case-ARC-10593-1: US-Patent-3,821,546; A simple, reliable and inexpensive control circuit is described for rapidly reducing the bias voltage across one or more of the dynode stages of a photomultiplier, to substantially decrease its sensitivity to incoming light at those times where excess light intensity might damage the tube. The control circuit comprises a switching device, such as a silicon controlled rectifier (SCR), coupled between a pair of the electrodes in the tube, preferably the cathode and first dynode, or the first and second dynodes. the switching device operating in response to a trigger pulse applied to its gate to short circuit the two electrodes. To insure the desired reduction in sensitivity, two switching stages, the devices be employed between two of the electrode stages, the devices being operated simultaneously to short circuit both stages. Official Gazette of the U.S. Patent Office N74-27705* National Aeronautics and Space Administration. Lyndon B. Johnson Space Center, Houston, Tex. DIFFERENTIAL PHASE SHIFT KEYED SIGNAL RESOLVER Patent Phillip M. Hopkins (Lockheed, Electron. Co., Houston, Tex.) and Wally M. Wallingford, inventors (to NASA) (Lockheed Electron. Co., Houston, Tex.) Issued 18 Jun. 1974 10 p Filed 12 Oct. 1972 Sponsored (NASA-Case-KSC-10769-1; US-Patent-3,826,964; A system, for generating a signal to control the rotation of a shaft supporting an antenna so that the antenna is rotated the shortest angular distance from a present angular position to a new desired angular position, was described. The system comprises a shaft encoder which generates a digital encoder signal indicating the present position of the shaft. A command signal is compared with the encoder signal to produce an analog signal for rotating the antenna. An error signal is produced for controlling the direction of rotation of the antenna. Official Gazette of the U.S. Patent Office N74-32711* National Aeronautics and Space Administration. by NASA Sponsored (NASA-Case-MSC-14130-1; US Patent-3,831,098; 09 C Avail: CSCL A pulse stretcher for narrow pulses is presented. The stretcher is composed of an analog section for processing each arriving analog pulse and a digital section with logic for providing command signals to the gates and switches in the analog section. Official Gazette of the U.S. Patent Office N74-32712* National Aeronautics and Space Administration. Pasadena Office, Calif. CAPACITANCE MULTIPLIER AND FILTER SYNTHESIZING NETWORK Patent Arthur J. Kline, inventor (to NASA) (Motorola, Inc., Scottsdale, Ariz.) Issued 20 Aug. 1974 21 p Filed 15 Nov 1972 Sponsored by resistor coupling an input signal e sub 1 of the amplifier inputs. The output e sub O of the amplifier is fed back and added to the signal coupled by the resistor R sub 2 to the amplifier through a resistor of value R sub 1. A discrete resistor R sub x may be connected in series for a lag filter, and a discrete resistor may be connected in series with the capacitor for a lead-lag filter. Voltage dividing resistors R sub a and R sub b may be included in the feedback circuit of the amplifier output e sub o to independently adjust the circuit gain e sub i/e sub o. Official Gazette of the U.S. Patent Office loops. The first servo loop includes a rate gyroscope carried on the air bearing table which generates a signal through a summing junction to be compared with a signal coming from a tachometer coupled to the slip ring assembly. The corrective signal is applied to a torque motor for rotating the slip ring assembly. The second servo loop includes a pair of photo detector cells which generate pulses responsive to the rotation of the air bearing table and slip ring assembly which are fed through a phase detector, and a variable gain amplifier to the summing junction circuit to provide a fine adjustment for rotating the slip ring assembly. Official Gazette of the U.S. Patent Office (NASA-Case-MFS-22343-1; US-Patent-3,840,829; US-Patent-Appl-SN-329237; US-Patent-Class-307-295; US-Patent-Class-307-304; US-Patent-Class-307-18; US-Patent-Class-307-35) Avail: US Patent Office CSCL 09B A gyrator circuit is described which is of the conventional configuration of two amplifiers in a circular loop, one producing zero phase shift and the other producing 180 phase reversal, in a circuit having medium Q composed of all field effect transistors of the same conductivity type. The current source to each gyrator amplifier comprises an amplifier which responds to changes in current, with the amplified signals feed back so as to limit current. The feedback amplifier has a large capacitor connected to bypass high frequency components, thereby stabilizing the output. The design makes possible fabrication of circuits with transistors of only one conductivity type, providing economies in manufacture and use. Official Gazette of the U.S. Patent Office N75-14957* National Aeronautics and Space Administration. Lyndon B. Johnson Space Center, Houston, Tex. FOUR PHASE LOGIC SYSTEMS Patent Howard L. Petersen (Lockheed Missiles and Space Co., Sunnyvale, Calif.) and Donald K. Kinell, inventors (to NASA) (Lockheed Missiles and Space Co., Sunnyvale, Calif.) Issued 24 Dec. 1974 7 p Filed 17 Apr. 1973 Sponsored by NASA (NASA-Case-MSC-14240-1; US-Patent-3,857,045; US-Patent-Appl-SN-351929: US-Patent-Class-307-208: US-Patent-Class-307-205) Avail: US Patent Office CSCL 09C A four-phase logic system is provided which includes at least four logic networks connected in parallel between a single power line and a reference potential. A four-phase clock generator generates four distinct clock signals from a single-phase clock input at data rate. Each logic network comprises a pair of complementary metal-oxide-semiconductor integrated transistors (CMOST). Each metal-oxide-Semiconductor transistor (MOST) in the pair is responsive to a clock signal which turns the transistor on or off. In each network, there is also at least one MOST which is responsive to a logic signal. The logic transistor is connected in cascade with the pair of CMOSTS. Official Gazette of the U.S. Patent Office |