Abstract: Circuitry for providing electrical isolation between an input signal source and other circuitry which utilizes such input signal. The isolation circuitry uses an optical coupling means comprising a light-emitting diode circuit and a photo-responsive element, the input signal being supplied by a bridge circuit which provides a unidirectional voltage from the input signal which is then applied to a normalizing, or limiting, circuit which converts the unidirectional voltage to a substantially constant value which is supplied to the light-emitting diode circuit. The circuit is responsive to an input signal which can be an AC signal or a DC signal of either polarity, such circuit having a high degree of noise survivability even in the presence of transient noise signals such as "showering arcs" having extremely high amplitudes.

Abstract: A temperature compensated, switchable current source wherein a Darlington pair of transistors in the output section of such current source is coupled to a source of switching signals through two electrical paths, each having a switching transistor and a diode network. The diode networks are arranged to produce a voltage variation at the input to the Darlington pair which varies inversely to the temperature variation developed across the base-emitter junctions of the Darlington pair of transistors. Coupling the Darlington pair of transistors to the source of switching signals through two switching transistors enables the current source to be rapidly driven from a conducting state to a nonconducting state in response to the switching signals.

Abstract: A circuit arrangement for amplifying pulsed signals comprises a step recovery diode charged by signals from a signal source through a diode biased in forward direction, the step recovery diode being discharged by a current flowing in the reverse direction through a diode path opened by pulses from a pump source, the reverse current flowing through a load resistor.

Abstract: The difference between the base potentials of a pair of transistors, which are interconnected at their emitter electrodes and operated with different densities of current flow through their base-emitter junctions, is scaled up by a fixed ratio and applied between the base electrodes of another pair of transistors with interconnected emitter electrodes to cause their collector currents to flow in a desired ratio.

Abstract: A field effect transistor of the N junction, P junction, or MOS FET type and having a load connected in series with its source and drain electrodes is normally biased off by a diode circuit which causes the FET to conduct when an input voltage is applied to an input terminal of the diode means.

Abstract: A high speed buffer circuit having an input and complementary outputs includes a pair of feedback transistors for shortening the response time of the output signals at the complementary outputs and a capacitive load at each output for delaying the effect of the output signals on the feedback transistors.

Abstract: A coulometric timing system having a source of supply with a coulometric timing circuit coupled to a cathode and an anode terminal of a coulometric cell for providing current flow for the electrolytic erosion of the anode filament. An LED is coupled in series circuit with the filament. Regulating diode means is coupled in parallel with the series circuit and to the source of supply for extinguishing the LED when the filament opens.

Abstract: A voltage memory device is disclosed wherein the gate of a MOS field-effect transistor is connected to one terminal of a capacitor and to an input voltage terminal through an input resistor and through the contacts of a reed relay while the source is connected to an output terminal and an output resistor, the input resistor being inserted in order to determine the charging time of the capacitor. When the reed relay is actuated, the capacitor is charged or discharged depending upon whether the input voltage terminal is connected to a positive or negative voltage supply source so that the output voltage increases or decreases. When the reed relay is de-energized, the output voltage remains at the same level. The voltage memory device has a function similar to that of the conventional variable resistors, but it eliminates the use of any sliding part and is operable at a relatively low voltage in a reliable and dependable manner. The voltage memory may be used in an automatic control system.

Abstract: A sensing system for use in a remote location which detects electromagnetic adiation energy, the system being self-activating, turning itself automatically on and off, as a function of radiation intensity across the detector. In essence, when no radiation is present across the detector, the system will consume no power, the switches and MOSFET discriminator being essentially in an "off" position. Radiation across the detector provides a current to an input capacitance which when charged turns on the switch and the MOSFET discriminator. A switch driver produces an output pulse showing the presence of radiation; the system then shuts off awaiting the next radiation input. Since the sensor system uses virtually no power unless radiation is present, it is ideally suited for use in remote environments where battery power and size is a predominant consideration.

Abstract: A logic gate circuit includes parallel drive of an output transistor and an inverter transistor by an input transistor. The inverter transistor then drives an active pull-up transistor which improves switching speed. The parallel drive of the invention allows the use of the active pull-up transistor without requiring a change in circuit voltage levels.