Abstract: A power amplifier is constituted by a complementary pair of one N channel and one P channel unsaturated junction type FET's constructing a single ended pushpull circuit, the N channel FET having a drain connected to the positive terminal of a first dc power source of a predetermined voltage and a source connected via a load to a ground potential, and the P channel FET having a drain connected to the negative terminal of the first dc power source and a source connected via the load to the ground potential.

Abstract: A power amplifier stage for an audio amplifier is constituted by a complementary pair of one N channel and one P channel unsaturated function FETs forming a single ended pushpull circuit. The stage is energized by a first d.c. power source. The gate potentials of the FETs are controlled by a series of control type constant voltage source comprising a pair of complementary series connected control transistors energized by a second d.c. power source which varies at the same rate as the first d.c. power source. A comparison circuit including a second pair of complementary transistors is connected to a d.c. reference voltage which varies to a smaller level than the first and second d.c. power sources in order to provide a constant quiescent current flowing in the drain circuits of the FETs even if the first and second d.c. voltage levels fluctuate.

Abstract: An improved filtering circuit connected to the inverting terminal of an operational amplifier having connected in parallel a first resistor and three series capacitors. Two series resistors are connected in parallel with the center capacitor and the junction between the two series resistor is connected to a fixed potential.

Abstract: A linear amplifier that is able to yield a maximum output voltage substantially greater than the breakdown voltage of the individual amplifying elements used and substantially greater than the voltage of a primary electric energy source that powers the amplifier. The amplifier consists of a plurality of stages connected in cascade, each stage, in turn, controlling the voltage level at which subsequent stages operate.

Abstract: A network for clamping a circuit node to a voltage level when the circuit is subjected to high radiation levels. The network includes a first resistor connected in series with a first radiation responsive element between said circuit node and a first point of potential and a second resistor connected in series with a second radiation responsive element between said circuit node and a second point of potential. In response to high radiation levels, the equivalent impedance of the radiation responsive elements decreases considerably and the potential at the circuit node is clamped to a voltage which is primarily determined by the potentials applied at said first and second points and the ratio of the first and second resistors.

Abstract: There is disclosed the saturated photon conditioning of a multiple gas discharge device by the provision of a sufficient flux of conditioning photons at each to-be-conditioned cell such that the necessary writing pulse amplitude for each cell is reduced to a minimum level. More particularly, there is provided a conditioning photon flux sufficient to reduce the necessary write voltage of the cell to such a level that the provision of more conditioning photons would not significantly further reduce the amplitude of the required writing pulse.

Abstract: An illuminating device for a microscope provided with a lighting control circuit controlled by changing the firing angle for which an impedance means is inserted between the output side of said lighting control circuit and primary side of the transformer in order to obtain a gentle rising curve for the current at the time of firing, thus to reduce the noise.

Abstract: A capacitance discharge type breakerless ignition system for an internal combustion engine, comprising ignition coil means including a main and an auxiliary primary coils and a secondary coil, capacitance means including two capacitances connected to said main and auxiliary primary coils, respectively to be charged by a charging voltage and at least one ignition plug connected to said secondary coil, time constants of said connections of said main primary coil and said corresponding capacitance and of said auxiliary primary coil and said corresponding capacitance when said capacitances are simultaneously discharged through said main and auxiliary primary coils being different from each other whereby said ignition plug is sparkingly discharged for a longer continuation time.

Abstract: The transistors of a differential amplifier are coupled at their common emitter electrode connection to a low voltage power supply terminal and at their collector electrodes through respective current sinks to a point of reference potential. The collector electrodes are maintained at a voltage level above the reference potential to permit input signal swings at the base electrodes of the transistors a comparable amount below the reference voltage level. Current sources are provided for satisfying that portion of the current demand of these sinks not furnished by the transistors. When the amplifier is connected to operate as a voltage follower, additional transistors may be provided to prevent an undesirable change in the polarity of the output signal, when the input signal swings substantially below the reference voltage level.

Abstract: An a-c plasma display panel including apparatus for driving the keep-alive cell sustain signal circuits in a non-fixed relation with address pulses. By constraining the keep-alive cells to be sustained in a time relation dependent on the address of a cell being addressed it is possible to increase the margins for the address signals and, in general, permit a reduction in magnitude of such address signals.

Abstract: A voltage amplifying device that is compensated to reduce variations in its output voltage due to changes in temperature or supply voltage by means of two transistors connected together so that changes in the base-emitter voltage of one transistor are counteracted by similar changes in the base-emitter voltage of the other transistor.

Abstract: A self-tuning filter is provided through the employment of a voltage tunable filter circuit which simulates a series resistor-inductor-capacitor (RLC) circuit and which is tunable to vary or adjust its resonant frequency in response to the value of an input control voltage. The filter is made self-tuning through the provision of suitable circuitry, responsive to simulated inductance and capacitance voltages, to generate the input control voltage and hence render the voltage tunable filter circuit resonant at the frequency of an applied input signal.

Abstract: Operation of the release contact causes a capacitor in the light measuring circuit to be connected to the D.C. supply. The voltage across the capacitor is applied to the gate of a thyristor in the ignition circuit. Only when the voltage across the capacitor has reached a value for proper operation of the exposure control circuit which terminates the flash, is sufficient voltage applied to the gate of the thyristor in the ignition circuit to cause it to fire, thereby causing the flashtube to ignite.

Abstract: A low frequency electro-thermal filter includes a pair of thermally coupled transistorized differential amplifiers. One of the differential amplifiers comprises a pair of heater transistors and the other differential amplifier includes a pair of sensor transistors, each heater transistor and its associated sensor transistor being fabricated on a single semiconductor chip. The heater transistors in the first differential amplifier serve differentially to heat the sensor transistors in the second differential amplifier in response to an input signal. The differential heating of the second differential amplifier differentially affects the electrical parameters of the sensor transistors and tends to upset the current balance between the stages of the second differential amplifier. A feedback loop is provided around the second differential amplifier for reestablishing the current balance thereof.

Abstract: An automatic flash device comprising:A power source,A main capacitor to be charged to a certain level by said power source,A discharge circuit being connected to said main capacitor,A control circuit to make the amount of electricity discharged by said discharge circuit correspond to flash photographing information,A means to start discharging, which is actuated after a shutter release means of a camera is actuated to start the discharging of said main capacitor, andA means to cause a flash tube to emit light when the amount of electricity charged at the main capacitor reaches such a value as corresponds to flash photographing information.

Abstract: An anti-skid brake control system having two wheel velocity pick-up coils connected to respective common mode rejection circuits. A coil open detector including a Norton amplifier is also connected from the said circuits to disable the system controller should an open develop in one of the pick-up coils.

Abstract: A sense amplifier having three transistor stages. A balanced differential input stage with high noise immunity to capacitively coupled noise. A second threshold stage is provided with protection against an output being caused by a permanent potential on the input, false trigger protection circuitry, and protection against supply voltage and other minor variations. A differential output stage increases noise immunity of the amplifier output and protects against a short circuit in the output.

Abstract: There is disclosed an electrical system and method for supplying operating potentials to gaseous discharge display panels and improving the performance characteristics of such devices. Write and erase operations are accomplished by means of controlling the level of pedestals which has the advantage over previous system in the improvement of sustaining and write/erase characteristics of gaseous discharge display/memory panels of the type disclosed in Baker et al. U.S. Pat. No. 3,499,167, which in turn produces a larger 100 percent operating window.

Abstract: Disclosed is a driving method for a thin-film electroluminescent element of a three-layer construction which emits light and exhibits the hysteresis phenomenon within the light emission versus applied voltage characteristics. The light intensity is maintained and memorized at a predetermined value in the element by the application of a train of sustaining pulses of alternating voltage, the amplitude thereof being chosen at the voltage level appearing at the point in the hysteresis loop characteristics where the difference between the maximum light brightness on the voltage decreasing curve and the minimum light brightness on the voltage increasing curve is considerably large. The sustaining light brightness is controlled by varying the amplitude or the pulse width of the sustaining pulses. The information may be written, memorized and eliminated in the EL element as variations of the light brightness.

Abstract: An output stage for an amplifier operating under capacitive loading conditions includes an FET-bipolar composite connected between its input and its output and an emitter follower connected in parallel with the FET. A current source and current tracking circuit maintains the emitter follower conductive at all times, such that relatively high frequency input signals are supplied to the output through the emitter follower. When the output stage is sourcing current to the load, the signal path is through the emitter follower. When the output stage is sinking current from the load, the signal path is primarily through the FET when relatively low frequency input signals are connected thereto and the signal path is primarily through the emitter follower when relatively high frequency input signals are connected thereto.