Abstract: A solid state event recorder having particular application to railroad locomotives has a plurality of interface modules to allow the collection of desired data over a period of time. Radio downloading of the data provided by a telemetry transmitter to wayside receivers is the primary way of downloading data. Alternative data downloading are provided by a removable memory module, a portable wireless data extractor and a laptop computer. The removable memory module is provided with its own backup battery power supply but normally derives its power from an inductive coupling to the solid state recorder. Data is read into the removable memory module from the solid state recorder via an inductive coupling, and data is read out of the removable memory module to the telemetry transmitter via another inductive coupling. Both the portable wireless data extractor and the laptop computer are used for maintenance purposes.

Abstract: A mini-relay signal tester designed to simplify, speed up, and test the operation of "mini" or "reed" relays which are suspected of intermittent failure. These types of relays are extensively used in memory and gate-array testing systems and their failure can cause the semiconductor devices being tested to be erroneously rejected. The relay tester dynamically exercises the relay being tested by application of a square-wave input signal to its coil. The square wave input "reference" signal driving the relay coil is then compared to a square wave output "test" signal which is generated by the contacts of the relay being tested. The signals are compared on a dual-trace oscilloscope. When difference between signals exceeds acceptable standards the relay is rejected.

Abstract: A miniature bulb assembly adapted to be mounted on a base board includes a socketless miniature bulb, a base portion molded of synthetic resin and a pair of terminal members. The miniature bulb is received in a bulb receiving hole at the central part of the base portion while a pair of lead wires extending from the miniature bulb are inserted through lead wire holes on the bottom wall of the base portion. Each terminal member comprises an elongated plate-shaped terminal and a base fitting portion, both of which are integrated with the base portion during a molding operation. The lead wires are connected to tongue-shaped pieces projecting from lead wire connection tabs in a clamped state. The base portion may be formed with T-shaped terminal insert holes on the opposite sides thereof such that terminal members each having a disengagement preventive tapered portion are tightly inserted thereinto from the above.

Abstract: A cartridge guiding device for a disk player which is easy to operate as an audio device for the domestic use. The cartridge guiding device includes a drawing in member provided in a mounting section of the disk player such that it is driven by a driving source to move toward the interior of the mounting section and is engaged, during such movement, with a stepped portion of a disk cartridge mounted on the mounting section to draw in the disk cartridge toward the interior of the mounting section, and a discharging member provided in the mounting section such that it is driven by the driving source to move toward the outside of the mounting section and is engaged, during such movement, with part of a disk cartridge mounted on the mounting section to discharge the disk cartridge from the mounting section.

Abstract: The improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means that are located at peripherally spaced positions within the panel. The support means provide compensation for thermal expansion of the shadow mask assembly. The compensation is a movement of the shadow mask assembly toward a screen of the tube as the shadow mask assembly expands. The support means at each of the spaced positions includes a stud attached to the glass envelope, a spring having an aperture therein engaging the stud, and a plate welded between the spring and the shadow mask assembly.

Abstract: Apparatus for controlling the time constant of a signal includes an up/down counter for counting pulses of a clock signal. The count value is utilized as output signal. The output signal is compared with the input signal to provide a first control signal determinative of whether the counter counts up or down. The output signal is compared with the input signal offset by a constant value to provide a signal which is ORed with the first control signal, and the ORed signal is utilized to enable/disable the counter. Applying a constant offset value to the input signal to be compared precludes the system from alternately counting up and down by one unit value during intervals of relatively constant amplitude input signals.

Abstract: A clock spring assembly useful in maintaining an electrical connection between a rotating and stationary electrical device the clock spring assembly comprising a hub, a housing, a retainer, and a coiled conducting means. The hub is rotatably associated with the housing at a single bearing. The hub is attached to the housing by a locking means.

Abstract: In accordance with a first embodiment of the invention, line dropout protection is provided for a d.c. motor wherein motor operation is prevented if power is applied at the time a main speed control device is not set in a zero position. Re-enabling motor operation is simply provided by resetting the motor speed control device to a zero position and reapplying power.In accordance with the second embodiment of the invention, line dropout protection is provided for a d.c. motor wherein predetermined excess motor acceleration is prevented when power is applied to the d.c. motor. The instant invention prevents motor start-up under unexpected conditions, thereby clearly enhancing safety during operation of any device controlled by the d.c. motor.

Abstract: A power supply includes a coupled inductor having a primary winding, a secondary winding and a feedback winding. A rectifier/filter is coupled to the secondary winding for supplying the load with a DC current. A power switch is coupled in series with the primary winding for switching between conductive and non-conductive states to control the flow of current through the primary winding. A first drive circuit applies a first drive signal to the control lead of the power switch for switching the power switch into the conductive state. A primary current sense circuit generates a primary current feedback signal representative of the primary winding current. An output current sense circuit generates an output current feedback signal representative of the power supply output current. A programmable reference voltage generator generates a DC reference voltage having a magnitude determined by the output current feedback signal.

Abstract: A liquid crystal pixel electrode and a thin film transistor (TFT) structure includes a select line, a portion of which is coated with undoped solid state material. The select line is parallel to a continuous uninterrupted side of the pixel electrode and a data line is parallel to another continuous uninterrupted side of the pixel electrode. A source area and a drain area of doped solid state material are placed over the undoped layer. The source area contacts the data line and the drain area contacts the pixel electrode. The select line also serves as the gate electrode of the TFT. A notch passes through the undoped material between the data line and the drain to prevent leakage.

Abstract: A leak and liquid level detector includes a transistor as its main operating element with a pair of normally open base contacts connected to the transistor base. The transistor emitter is connected to ground and the transistor collector is connected to a suitable audio alarm, or alarm light or to a programmable logic controller. When a liquid leak bridges over the base contacts, a power circuit is closed across the contacts biasing the transistor and causing an electrical signal to flow from the collector to actuate the alarm, light or controller. The base contacts are linearly adjustable to sense various leak heights. The detector in one mode of use can be positioned horizontally to detect leaks and in a second mode of use is positioned vertically to detect a change in a liquid level in a tank, pipe column or the like.

Abstract: The invention disclosed herein relates to a test socket for making solderless connections between an electrical component and a printed circuit board. The socket includes a lid member that translates longitudinally with respect to a base member upon operating a cammed actuator. The lid member is connected to and guided upon the base member by a plurality of flexible linking clips. The invention includes a plurality of electrical connectors having a pair of resilient beams that are preloaded. A lead portion is formed from one of the opposed beams and extends unitarily therefrom.

Abstract: A variable inductance RF coil assembly including an air-core, high-voltage coil, a printed circuit board installed inside of the coil, the circuit board carrying a plurality of switch contacts corresponding in location and in number to the turns of the air coil, a contact plate attached to the circuit board and having contact fingers corresponding in location and in number to the switch contacts, and a rotary, stepped cam cylinder mounted to the circuit board, the cams corresponding in location and number to cam-follower sections of the contact arms on the contact plate. Unidirectional rotation of the stepped cam cylinder causes progressive communication between the cam steps and the cam-follower sections. Such communication causes the contact arms to connect with the switch contacts on the circuit board thereby progressively and continuously shorting out each successive turn of the coil thereby to adjust the inductance thereof.

Abstract: In a receiver for receiving an information signal including digital information samples which are contaminated with an interference component having known frequency characteristics, a filter is provided having a signal generator responsive to at least a portion of the received signal for generating an output signal having the frequency characteristics of the interference component and an amplitude and phase controlled by the portion of the received signal. A combiner combines the generator output signal with the received signal for generating a filtered output signal having the interference component substantially removed therefrom, which is then applied to an interpolator. In response to the identification of incorrect digital information samples in the received signal, control of the generator by that portion of the received digital information signal which contains the samples identified as incorrect is disabled.

Abstract: Disclosed is a system comprising a plurality of networks, encapsulated in substantially electrically non-conductive materials and positioned interior to the outer surface of an encasement region. According to the invention, at least one outer surface of at least one of the encapsulated networks is complementary to, adjacent to, and in physical contact with at least one outer surface of at least one other of the encapsulated networks. Also disclosed is a method for constructing the system. In a preferred embodiment, the system is a toroidally shaped power supply whose modular structure facilitates ease of testing and assembly, affords considerable space savings, substantially reduces manufacturing waste costs, and eliminates a proven source of circuit failure.

Abstract: Disclosed is an apparatus for receiving a selected channel of a signal having a plurality of channels, each channel having a plurality of subchannels. A parabolic reflector, low noise amplifier and block converter receive the signal. A tuner detects the selected channel in the received signal and provides a detected signal corresponding to the selected channel. A demodulator demodulates the detected signal into a baseband signal corresponding to the selected channel, the baseband signal being modulated with the subchannels of the selected channel. An analog bus is connected to the demodulating means for providing the baseband signal. A first demodulator connected to the analog bus demodulates a first subchannel of the subchannels of the baseband signal and provides a signal representative of the first subchannel. A second demodulator connected to the analog bus demodulates a second subchannel of the subchannels of the baseband signal and provides a signal representative of the second subchannel.

Abstract: An implosion-resistant cathode-ray tube has an evacuated envelope with a faceplate which includes a substantially rectangularly-shaped viewing portion that extends to a peripheral sidewall. The sidewall has corners with a given radius of curvature which extends into flattened portions. An implosion protection band extends around the sidewall. A plurality of mounting lugs each having a base portion and an upstanding attachment portion cooperate with the implosion protection band. The base portion of each of the mounting lugs is disposed between the band and the sidewall. The present implosion protection band is improved over prior bands by forming a plurality of concavities in the band to accommodate the base portions of the mounting lugs. The concavities prevent lateral displacement of the mounting lugs and also maximize the contact between the implosion protection means and the sidewall of the faceplate panel.

Abstract: An acoustic transducer with an improved electret assembly mounting for providing spacings between the fixed and movable electrodes, and having as one feature the lowering of the undesired capacitance therebetween.