Abstract: A load which is being hoisted by a crane having at least one line under tension causes a line load responsive transducer to send a signal proportional to the load on such line to an integrated amplifier circuit on a printed circuit card in a power pack. The printed circuit also contains an integrated line multiplier circuit and an actual load signal/load limit signal integrated comparator circuit, as well as a power supply circuit having a regulated constant voltage output for the entire system. Manually adjustable digital line number set switches and load limit set switches are also contained in the power pack for supplying corresponding signals to the multiplier and comparator circuits, whereby visual and audible warning signals are automatically activated on a display module, when the preset load limit is reached. The display module is also provided with an actual load indicating meter, and a push-button test switch for checking a fixed line number simulated signal with the aid of the meter.

Abstract: A differential amplifier is connected at one output terminal to the input terminal of a current mirror and at its other output terminal to the second terminal of the current mirror and to a load in shunt with the current mirror. In response to one polarity of an input signal applied to the amplifier, the current mirror saturates receiving substantially all of the amplifier current. In response to another polarity of the input signal, the current mirror operates in a linear mode receiving a portion of the amplifier current, and the shunt load receives the remaining current. In one embodiment the shunt load includes a series connected diode and resistor.

Abstract: A system for providing continuous operation of electrical appliances, lights, etc. comprising a primary load circuit and a secondary load circuit. Each of the load circuits having a source of power and a load. Monitor means is arranged between the primary and secondary load circuits which is responsive to the passage of current in the primary circuit to maintain the secondary circuit inoperative, and responsive to the cessation of current in the primary circuit to render said secondary circuit operative. Preferably the monitor means comprises a transformer and a solenoid relay.

Abstract: A method and apparatus for controlledly attenuating the power of microwave energy passing between a source and an active load. Microwave energy is input to a first port of a circulator, whence it proceeds to a second port of the circulator, passing into a waveguide. A passive load is located in the waveguide for absorbing the incident radiation. A variable short is also connected to the waveguide, such that it embodies a variable reactance preferably in parallel with the passive load. Variation of the reactance of the variable short alters the fraction of power absorbed by the passive load, and concomitantly alters the converse fraction of the power reflected back toward the circulator. This reflected energy is directed to a third port of the circulator, at which point it may be utilized by the active load. A fourth port with an attached additional passive load may be added between the active load and the source for preventing undesirable reflections or emissions of radiation from the load back to the source.

Abstract: An integrated circuit including integrated circuit resistors whose geometries are designed in accordance with the method of significant weights in order to optimize resistor tracking relative to process-induced changes in resistor values. The result of this method is an integrated circuit in which different resistors have different, rather than the same, widths.

Abstract: An output switch amplifier in a gate circuit has improved short circuit resistance and employs two transistors, the emitter-collector paths of which are connected in series via an emitter resistor of one of the transistors of at least 250 ohm and by way of a diode. The connection point of the resistor with the diode provides an output terminal. The transistors are controlled for conduction or blockage depending on the switching state. If the transistor with the emitter resistor is conductive, the diode will be blocked. In the case of short circuit at the output, the short circuit current at the emitter resistor will produce a voltage which exceeds the Zener break down voltage of the diode. The diode becomes conductive and limits the voltage drop at the emitter resistor since it is connected with the base of the conducting transistor. The possible power consumption in the transistor is therefore limited to a value which is not harmful.

Abstract: In a chrominance signal amplifier stage of the long-tailed pair type including a current branch circuit and a load resistor in one of the current branches from which a burst signal is obtained, the amplitude of this burst signal is rendered independent of an adjusting or control voltage active on a branch current by including a parallel current branch and blocking current branches not connected to the load resistor.