This invention relates to an improved solid state switching circuit for switching an A.C. load current fed from an A.C. power supply in response to values of input signal. The improvement is that, a pair of thyristors are provided in the circuit, for each to share the switching of positive and negative parts, respectively, of the load current to pass when the power supply voltage is near or at zero. Thus each thyristor switches very exactly in response to the values of input signal and power sup...

An improved solid state transmitter (and elements therefor) adapted particularly well to pulsed operation at radio frequencies is disclosed. Such transmitter includes the combination of: A crystal-controlled oscillator producing a continuous wave output signal which, ultimately, determines the frequency of each transmitted pulse; a first oscillatory circuit, including a resonant cavity and at least one normally quiescent coaxial oscillator incorporating an IMPATT diode; a second oscillatory circ...

A solid state disconnect or isolating device for disconnecting a subscriber on his premises, replaces a relay with associated circuitry and items. It can be coupled with a surge protection device to provide disconnect signalling, plus loop testing if desired. The device comprises a normally "on" junction field effect transistor which acts as a pinch resistor.

An operation state display apparatus includes a counter for receiving input signals which respectively represent the individual operation states of a controlled object and for counting the duration time of at least one of the ON and OFF state of the input signal. A memory device is provided for memorizing the period of time lapse from an operation initiation reference time when the input signal goes from the OFF state to the ON state or vice versa. A display device is provided for displaying in ...

Solid state polymerization of relatively low I.V. polyester using a water-soluble anti-stick agent.

A solid state television camera having a solid state image sensing device and an optical color filter. The color separating characteristics of the color filter are so selected that when a predetermined horizontal scanning line is scanned the solid state image sensing device produces a standard red color signal and a luminance signal sequentially and alternately, and when an adjacent horizontal line is scanned, a blue color signal and luminance signal are produced in the same manner. In this way,...

An improved alternating current prime mover control system and method for, for example, the control of a valve position or other physical variable whose state can be sensed or calculated wherein the state of the physical variable is compared with a reference variable to generate, in conjunction with a waveform generator, a fixed amplitude signal that has variable time duration which feeds a part of the control system that drives the alternating current prime mover source in more than one directi...

The limited temperature range for operation of conventional semiconductive force transducers is greatly extended in both directions, typically attaining a range from about 4.degree. Kelvin to at least about 400.degree. C. A piezoresistive strain gage is typically formed in a monocrystalline layer of semiconductive material grown epitaxially to a thickness of only a few microns on a monocrystalline support member which has high inherent resistivity and serves directly as force responsive member. ...

A solid state circuit providing the function of a ratchet relay which circuit is relatively immune from noise and is capable of high speed switching operation. The circuit is adapted to receive an AC input trigger signal and convert such signal into an appropriate signal for alternately firing a pair of triacs that are each serially connected with a load and an AC power source. The circuit includes an input section comprising an AC to DC pulse converter, a time delay network, and a pulse shaping...

Clock signals, data words and qualifier signals are received via monitor probes during a data acquisition mode, selected data words being stored in a memory in response to the clock and qualifier signals. The stored data words may then be displayed in a tabular or a map format on a cathode ray tube screen. Data words may be acquired randomly, i.e., in a free-running sampling mode, or acquired selectively by using pattern recognition and delay trigger circuits. Using the tabular display format, d...