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Component Parts, IRE Transactions on

Issue 2 • Date Jun 1959

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Displaying Results 1 - 9 of 9
  • Recent Developments in Fixed Resistors

    Publication Year: 1959 , Page(s): 109 - 113
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    The commoner types of resistor used in electronic apparatus are discussed in terms of recent developments. In most cases developments have been largely progressive improvements without fundamental changes in the component. Some of the more interesting of recently developed types are also considered, these being metal films and metal oxide films and combinations. Their potentialities are outlined. The paper concludes with some account of resistors that are in the process of development and may be available soon. Improvement and development in pyrolytic carbon resistors is foreseen and wider availability and use of metal and metal oxide films are predicted. View full abstract»

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  • Development of Plastic Dielectric Capacitors

    Publication Year: 1959 , Page(s): 114 - 118
    Cited by:  Papers (2)
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    The salient characteristics of capacitors having dielectrics of polystyrene, polythene, polytetrafiuorethylene, and polyethylene terephthalate are enumerated, and the current trends are indicated. Test results on experimental capacitors made with the new polycarbonate film are also quoted. View full abstract»

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  • Problems in Long-Term Component Reliability

    Publication Year: 1959 , Page(s): 62 - 81
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    The motion of submerged repeaters during laying and pick-up in deep water has been investigated and the results are presented. An attempt has been made to gather together in a systematic way the very scattered references to long-term deterioration problems affecting the choice of materials of which components are made. Component testing procedure is discussed and special features of individual components which affect long-term deterioration are mentioned. View full abstract»

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  • Magnetism and the Rare-Earth Metals

    Publication Year: 1959 , Page(s): 93 - 105
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    After a brief outline of the history of the discovery and separation of the rare-earth elements, the modern theory of paramagnetism is summarized, and its application to these metals is discussed, with particular attention paid to the way in which deviations from the simple laws of paramagnetism at low temperatures can yield information on the types of magnetic interaction which exist in them. The present state of experimental knowledge about the rare-earth metals is described, and its interpretation for each element is discussed. View full abstract»

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  • Metal and Oxide Film Potentiometers

    Publication Year: 1959 , Page(s): 105 - 108
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    Recent developments in resistors and potentiometers of the noble metal and metal oxide film types are described. Photographic methods of producing "meandered" resistance paths in the two types have been developed, as well as means of rhodium reinforcing the track portions to improve the wear characteristics, and in the case of oxide films, to reduce the contact resistance against the wiper. The relation between resistance, temperature coefficient, and film thickness has been determined for oxide films on glass comprising tin oxide as the major constituent, and from these, the conditions to result in low temperature coefficients over a relatively wide resistance range are deduced. The characteristics in respect of wear, noise, temperature coefficient, and electrical load for either type of element are briefly discussed. View full abstract»

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  • A Comparison of Thin Tape and Wire Windings for Lumped-Parameter, Wide-Band, High-Frequency Transformers

    Publication Year: 1959 , Page(s): 49 - 57
    Cited by:  Papers (1)
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    This paper considers the problem of optimum design of the impedance matching, lumped-parameter, wide-band transformer model with all transmission zeros at infinity. The spiral-tape-winding transformer is compared with the wire-winding transformer with an electrostatic screen, and it is shown that the former has no advantage over the latter except (perhaps) at quite low impedance levels. The low-pass-filter model of the transformer is considered in more detail than is customary, and it is shown that the HF performance of any lumped-parameter wideband transformer may be extended in proportion to the number of branches selected for the ladder network model of the transformer; building out the transformer-coupling network to include additional inductors and capacitors thus extends the frequency response. For a given network model and a given low-end cutoff frequency, it is shown that the high-end cutoff frequency is a function of the peripheral distance around the winding, the mean impedance level of the source and load, and the turns ratio. From this relation it is shown that the most favorable turns ratio is unity and that the most favorable impedance levels are low ones. View full abstract»

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  • The Physics of the Solid-State Maser

    Publication Year: 1959 , Page(s): 81 - 93
    Cited by:  Papers (1)
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    Since the demonstration of the possibility of achieving very low noise amplification of signals in the centimetric wavebands, a great deal of work has been carried out in various laboratories with a view to producing and testing devices. The major part of the present article focuses attention on one particular device, the three-level solid-state maser. The physical principles underlying the process of stimulated emission of radiation are in many cases unfamiliar to electronic engineers, and study of the growing literature on the subject can be confusing without a clear understanding of the physics involved. The present article outlines the general theory of emission and radiation processes, particularly as they apply to the microwave spectrum. A quantum mechanical description is employed throughout, and a brief and not very rigorous account is given of the relevant portions of this theory as it applies to the investigation of transistors between energy levels. Well-known expressions are derived for the operating characteristics of a three-level maser, particular attention being given to the significance of the various factors involved and their relationship to easily measured quantities. Little information is included concerning practical maser amplifiers; at the time of writing, few practical devices had been constructed. A survey of recent literature indicates the rapid progress which has since been made, and shows the interest in the development of masers. View full abstract»

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  • A Comparison of the Noise and Voltage Coefficients of Precision Metal Film and Carbon Film Resistors

    Publication Year: 1959 , Page(s): 58 - 62
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    Measurements of the current noise and voltage coefficient are given for metal film and carbon film resistors. In general, the noise power in the metal resistors was less than that in the carbon by a factor of 103, although a few of the former type were very noisy. For many typical applications in and below the audio spectrum the current noise in a large fraction of the metal resistors will be smaller than thermal noise even at rated dissipation. The voltage coefficients of the metal resistors were less than those in the carbon by a factor of about 10; in most units of the former type the coefficienats were less than 3 X 10--5per cent/volt, and in a few units they were less than I X 10--6per cent/volt. Voltage coefficients of both signs were found in the metal resistors, while all of them were negative in the carbon resistors. View full abstract»

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  • Some Recent Developments in Magnetic Alloys

    Publication Year: 1959 , Page(s): 119 - 122
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    The magnetic properties and use of some conventional and new alloys are discussed. The control which can be exercised on the switching properties by varying composition and treatment is indicated and a very fast switching alloy described. The abnormally low permeability of very thin strip is explained; it can be avoided by keeping material and furnace atmosphere pure. The latest aluminum-iron and cobalt-iron alloys, and permanent magnets, are briefly described. View full abstract»

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Aims & Scope

This Transaction ceased production in 1962. The current publication is titled IEEE Transactions on Components, Packaging, and Manufacturing Technology.

Full Aims & Scope