An integrated-circuit (IC) transimpedance amplifier having a successive series of DC-coupled balanced symmetrical amplifier stages with overall current feedback. The input stage includes a pair of series-connected NPN/PNP transistor with common emitters serving as the inverting input terminal. The second stage includes a cross-coupled transistor quad with the bases of the first quad pair coupled to the collectors of the first stage transistors. The inter-stage coupling circuit includes a series ...

A solid-state direct-coupled differential potentiometric amplifier including a differential voltage-to-current G.sub.m amplifier in cascade with a differential current-to-voltage R.sub.m amplifier. The G.sub.m amplifier is driven at a common mode voltage by a common mode voltage amplifier coupled as a power supply thereto, with the common mode voltage being detected at the signal input terminals. It is not necessary to differentially balance the differential gain-determining network of the G.sub...

Amusement and agility-developing means comprising a plurality of generally circular toroidal structures including a first generally toroidal member having a certain predetermined diameter and a number of additional toroidal structures, each additional structure having a diameter greater than its neighbor, and resilient coupling means interposed between adjacent toroidal members at substantially equal arcuate dispositions about the periphery of each of the toroidal structures. The unit preferably...

An essentially two-dimensional electric-wave filter is formed by depositing a film of piezoelectric material upon a substrate and by applying input and output electrode pairs to different portions of the film. Each electrode pair together with the film and substrate form a composite resonator. The two composite resonators are located for a desired mechanical coupling between the two composite resonators. The filter may also consist of an array of n coupled composite-resonators having a common fi...

A monolithic cross-coupled differential amplifier circuit for amplifying a bipolar input signal having a low signal-to-noise ratio. The differential amplifier circuit comprises two transistor differential amplifiers having cross-coupled inputs and a common output. Both amplifiers are normally biased on so that all differential mode and common mode input signals are normally rejected. Means is provided for cutting off one of the differential amplifiers when a differential or bipolar information s...

The gyrator of the present invention comprises an electronic circuit arrangement of transistors and resistance means in combination with unique biasing means which permit gyrator operation without the normally required input and output blocking capacitors. Transistor means connected to the input and output terminals of the gyrator perform as current to voltage converters and cooperate with a third intermediate voltage inverting transistor means and appropriate biasing resistors to achieve gyrato...

A symmetrical direct-coupled trigger circuit comprising first and second interconnected stages, each including current switch logic means. In the first stage, a plurality of current switches have selected respective collector output lines and emitter output lines interconnected to provide logic signals at a pair of nodes; the nodes are connected to the second stage so that accompanying signal propogation is held to two stages of delay.

An elastically coupled joint comprises a shaft for transmitting rotary motion, a housing in which the shaft is concentrically inserted, an elastic member provided between the shaft and the housing, and a stopper for preventing excessive displacement between the shaft and the housing. The housing is provided, at an end thereof with a yoke for supporting a spider of a universal joint. The elastic member is provided with a tubular outer ring and a cylindrical elastic body fixed on the inner side of...

A magnetically coupled servomechanism wherein a remote magnetic device is driven by a motor and is magnetically coupled to a second rotatable magnetic device in a hermetically sealed unit for implantation in the body of an animal, which device imparts its resultant motion to an output shaft connected to a stepdown gear train having an output shaft which imparts torque to the element it is desired to rotate. The input shaft, gear train and output shaft are also in the hermetically sealed unit. Th...

Fiber optical faceplates adapted to be coupled together in close physical contact to transfer light from one faceplate into the other with increased efficiency.