A three-terminal current amplifier includes first and second transistors of a first conductivity type. Their respective collector electrodes are connected to input and output terminals of the current amplifier, respectively. Their emitter electrodes are each direct current conductively coupled to the common terminal of the current amplifier. Their base electrodes are coupled to the output circuit of a common-base transistor amplifier having its input circuit connected to the current amplifier in...

The invention relates to a current adaptor which can be connected to a current supply rail. The current adaptor comprises a housing with grips on either side whose free ends are bent in the form of a hook so as to grip around the current supply rail. The grips are hinged to the housing and those sides of each of the grips which extend beyond the pivot viewed from the free end, are pressed apart with the aid of a spring incorporated in the housing.

A current limiter is provided comprising a casing housing a first and a second terminal, the first terminal being electrically connected with a thin blade-shaped bimetal. The bimetal is energized with a bias force acting lengthwise thereof so that it assumes a pair of stable positions in which its plane lies on opposite sides of a critical line. In one stable position, a contact attached to the bimetal is held in abutment against the second terminal. When the current flow through the bimetal acr...

A current transformer switchable at the primary side and operable in an electrical system at high voltage and current for detecting currents in respective current ranges is disclosed. The current transformer includes a secondary system defining a window passage therethrough and having an iron core. A plurality of primary windings surround the core and the windings include respective conductors having respective cross-sections stepped down in magnitude one with respect to the other in corresponde...

A device for the transmission of electric current between relatively rotating parts comprises a pair of electrically conducting members spaced from one another along an axis, said members presenting opposed surfaces perpendicular to said axis and spaced from one another therealong. One of said members is rotatable relative to the other about said axis, and said surfaces provide a ball race in which are located a plurality of balls separating said members and providing an electrical connection th...

A three-terminal current amplifier has a current gain substantially independent of the forward current gains of its component transistors. It employs a first transistor with collector-to-base feedback regulating its collector current flow to equal applied input current and a second transistor having a base emitter circuit in parallel with that of the first transistor. Output current from the collector electrode of the second transistor consequently is proportional to the input current. Means are...

A current sink includes an electronic component having a switched current path and a control terminal. The current path can be switched to a low-impedance condition by the control terminal to sink a current flowing into it. A component having a frequency-dependent passband is connected to the control terminal for passing signals of a predetermined frequency range.

A current collector includes the following members. A frame is mounted at its base end on a movable body. A current collector shoe assembly is mounted on a top end of the frame and is brought into contact with a feeder. A first spring applies a spring force to the frame so as to urge the top end of the frame toward the feeder. A second spring is arranged between the frame and the current collector shoe assembly for pressing the current collector shoe assembly to the feeder. A damper applies a da...

A novel power amplifier output stage is taught which provides rail-to-rail output voltage swings, high current source and sink capability, which is capable of class AB operation to provide low distortion amplification. The power amplifier of this invention is suitable for fabrication in integrated circuit form, thereby achieving the small size necessary for use with miniaturized disk drives, as well as low cost and high reliability. A first transistor is driven by the output of a transconductanc...

A current regulator for a laser tube used in a ring laser gyroscope includes a ballast resistor coupled to the laser tube's anode, an output for the current, such as a current sensing resistor, a current source coupled between the ballast resistor and the output, a control circuit that establishes the amount of current flow through the current regulator, and a voltage divider that senses the voltage across the current source. The current source includes two transistors coupled in series and the ...