bluuebunny/crossref_metadata_2025 huggingface dataset:
Estimation of Optimum Braking Time for Capacitor-Excited Induction Motor
Authors: Puri I. K.
Published: May 2015

The braking time of a capacitor-excited induction motor estimated from approximation of the fifth order polynomial equation does not give satisfactory results; whereas detailed analysis results, using a computer programme, are very close to experimental values. This paper explains how to obtain optimum values of braking time, resistance and capacitance for any particular motor.
A Recent Laplace Inversion Technique Applied to a Transmission Line Problem
Authors: Ledda G. , Mullineux N. , Reed J. R.
Published: May 2015

A numerical inversion method employing orthogonal functions is tested on an idealized transmission line problem. The reasons for its shortcomings are qualitatively discussed.
Numerical Laplace Transformation and Inversion
Authors: Wilcox D. J.
Published: May 2015

The paper presents an efficient basis for the numerical manipulation of the Laplace transform for the purpose of solving transient problems which are not amenable to conventional analytic manipulation. Although the underlying material is not new, the manner of presentation is such as to expose important matters of detail.
A Unified Approach to Electronic Circuit Analysis Using the Indefinite Admittance Matrk
Authors: Rao D. B. S. J. Prasada , Singh B. P.
Published: May 2015

A unified approach to transistor, F.E.T. and passive circuit analysis using the indefinite admittance matrix is presented in this paper. The indefinite admittance matrix with its easy adaptability for computer-aided analysis and design makes it a suitable basis for teaching active and passive networks.
A Simple Form of the Distributed RC () Notch Filter
Authors: Salawu R. I. , Osibo O. O.
Published: May 2015

In this communication, a simple method of realizing the distributed RC ([Formula: see text]) notch filter is discussed. It uses components which are readily available in an undergraduate laboratory. Experimental results obtained with the structure show reasonably good agreement with theory.
Solution of the Telegraphist's Equations for Coupled Transmission Lines
Authors: Irish R. T.
Published: May 2015

An approach to the solution of coupled transmission line systems is here presented as an alternative to the usual coupled mode solution. The results are readily extensible to cover such line systems under a variety of conditions including the effects of loss, asymmetric coupled lines and non-uniform coupled lines.
The Exponential Representation of Waveforms
Authors: Newsome J. P. , Edge D. A.
Published: May 2015

In electrical circuit and system analysis, it is common practice to represent sinusoidally-varying functions in either circular function or exponential form. This article examines certain aspects of the theoretical background of this topic and illustrates important issues by means of examples.
Measurement of Thermal Noise
Authors: Mathieson E.
Published: May 2015

This article describes some teaching laboratory investigations of thermal noise. It is shown that under certain conditions the thermal noise current from a resistor may be measured with considerable accuracy, allowing meaningful comparison with theoretical prediction. Brief discussion of relevant theory is included. A novel shot noise generator, used for calibration, is described.
On the Lowest-Order Excitation-Response Differential Relation of a Linear Time-Invariant System
Authors: Milić Mirko M.
Published: May 2015

A simple procedure is presented to ascertain whether a higher-order differential equation relating the response to the excitation of a linear time-invariant system is of the lowest order, and to recover the lowest-order equation from the given equation as well as from the associated transfer function.
Effects of Feedback Signals on the Transient Response of a Power System Using a Solid State Excitation System
Authors: Lo K. L. , Rahim A. H. M. A. , Biswas S. K.
Published: May 2015

This paper analyses the effects of feedback signals in a solid state excitation system, in addition to the normal voltage regulator signal, on the transient stability of a power system. It was observed that a suitable combination of speed deviation and torque angle deviation signal reduces the transients most effectively.
A Graphical Presentation of the Resistive Thevenin Theorem
Authors: Cotter G. T.
Published: May 2015

By means of an example, the usual analytical approach to the resistive Thevenin Theorem is complemented by a graphical interpretation. Resistive controlled sources are examined, and the concept of equivalence is used to show why the reduction of controlled sources to zero gives incorrect answers in the determination of the Thevenin resistance.
Bringing Engineering into the Schools
Authors: Buckley Anne
Published: May 2015

A scheme is described, which has been in operation since 1976 in the U.K. A practising engineer spends a day visiting a school and talking to groups of 13 to 15-year-olds about his work, in the hope of inspiring interest and attracting young people to engineering as a career.
An Example of an M.Sc. Course — Digital Electronics at U.M.I.S.T.
Authors: Hartley M. G.
Published: May 2015

The paper discusses the Digital Electronics M.Sc. Course at U.M.I.S.T. The relation of M.Sc. courses to overall departmental activity and especially to research at M.Sc. and Ph.D. level receives special attention. The future of M.Sc. Courses is considered.
The Micro-Machine as a Teaching Aid to Power System Simulation Study
Authors: Tripathy S. C. , Durgaprasad G. S. S. S. K.
Published: May 2015

The micro-machine is a scale-model of large generators in electric power systems. This model is useful as a teaching aid in a power systems laboratory to help students understand the basic concepts of electro-mechanical dynamics, the principle of regulator and stabilizer design and test procedures.
A Method of Computation for Application to Nonlinear Problems
Authors: Browne K. F. , Kirkland I.
Published: May 2015

The solution of first-order differential equations with non-linear coefficients is assisted by a computer programme which generates sets of curves and their slopes from experimental data. An example predicts the self-excitation curves of a d.c. shunt-generator.
Design of a Lead Compensator with Minemum Attenuation
Authors: Unnikrishnan R.
Published: May 2015

This paper discusses a simple proof for the geometrical construction for the design of a phase lead compensator with minimum attenuation. Also, certain equations used in the proof are shown to be useful in the analytical determination of the attenuation factor and pole-zero locations of such a compensator.
Electrical Engineering Curriculum Development at the University of Indonesia: A Continuing Experiment
Authors: Mantera I. G. , Hartanto Djoko
Published: May 2015

Educational problems in a developing nation are numerous. The shortage of highly qualified people is amplified by the influx of modern equipment and the limited teaching facilities. This paper briefly illustrates the tertiary educational problems faced by Indonesia, a country with a population of a hundred and thirty Ave million.
Electrical Engineering Education: A Perspective from a Developing Country
Authors: Tan H. S.
Published: May 2015

This paper gives a brief description of the degree course structure in Electrical Engineering at the University of Malaya. This is discussed in the context of a small developing country which is mainly agriculture-based, with an increasing pace of industrialisation.
Electrical Engineering Education in India in the Eighties
Authors: Sarkar B.
Published: May 2015

The trend for the Eighties points to a growth in theoretical activities in undergraduate and postgraduate education and research and also growth in unemployment among engineering graduates. The incompatibility between growth of theory-oriented engineering education and the needs of the time makes education lose its relevance to society.
Phasors without Mathematical Legerdemain
Authors: Herbert C. G.
Published: May 2015

A mathematically sound and physically appealing method of introducing phasors is presented. The method gives equal importance to polar and rectangular forms, clearly distinguishes time and frequency domains, explains the need for phasors before considering the technique, uses a form of inverse tangent appropriate to four quadrants and leads naturally to more profound transformation techniques which the student will later encounter.
Demonstration of Fuse and Circuit Breaker Principles
Authors: Blackburn T. R. , Thompson R. W.
Published: May 2015

Two demonstration experiments are described which illustrate the principles of fuse and circuit breaker operation. They are devised to demonstrate, starting from the basic device in each case, the effect of various means of arc control and how specific problems may be overcome by proper design.
An Inexpensive Hall-Effect Digital Wattmeter
Authors: Hampson R. F. , Saunders J. A. , Streatfield C. G. J.
Published: May 2015

A digital wattmeter, based upon a commercially-available Hall-effect transducer is described. The wattmeter is easily constructed and calibration requires only an a.c. voltmeter. At power frequencies the accuracy is within 1% of full-scale reading, when used in single-phase circuits, and within 1.25% in balanced three-phase circuits.
An Approach to the Teaching of Difference Amplifiers
Authors: McGhee J.
Published: May 2015

The bisection theorem is normally used in the analysis of difference stages. An approach utilising only the basic circuit theorems, is presented. Generalisation is demonstrated for arbitrary input, output and stage configuration using the Z-matrix of linear, two-port network theory.
On the Presentation of Error Coefficients in Introductory Control Theory
Authors: Johnson C. Richard
Published: May 2015

Error coefficients, a measure of steady-state polynomial tracking accuracy, have commonly, though inappropriately, been based on the actuating error in a negative unity feedback configuration. This paper develops an alternate introductory presentation correcting this misdirected structural normalization by providing generalized formulas directly related to system tracking capability.
A Simple Real-Time Demonstration of Fourier Transform Pairs
Authors: Lam F. K.
Published: May 2015

A simple system which employs an ultrasonic strip line as a linear dispersive delay filter has been implemented for demonstrating Fourier transform relationship in real time. Fourier transforms of signals having rectangular, triangular and trapezoidal waveforms have been successfully obtained. Results are in good agreement with theoretical plots.
Ferranti Effect with Variable Frequency
Authors: Jones K. M.
Published: May 2015

The author analyses the behaviour of the long transmission line when the supply frequency is varied and uses the results to predict the voltage rise on open circuit (Ferranti effect). Model line tests are suggested as a useful educational experience requiring quite simple mathematics, on a topic outside the usual references.
Simple and Inexpensive Test Equipment for Magnetic Flux Measurements in a Ferromagnetic Core
Authors: Rahman Arifur
Published: May 2015

This paper describes a simple laboratory test equipment for classroom determination of the normal magnetization curve and hysteresis loop of a built-in ferromagnetic core. The circuit details, steps of design of the magnetic circuit coils and test results are also presented.
A Versatile Power Source for Teaching Power Electronics
Authors: Smith G. A.
Published: May 2015

A thyristor power source is described which provides control of ten different power circuits including a.c. regulators, single-phase and three-phase rectifiers. Front panel controls allow for synchronising and optimisation of the servosystem.
A Four-Year ‘Enriched’ Electronic Engineering Course
Authors: Dorey A. P. , Smith R. C. , Carré B. A.
Published: May 2015

Existing three-year engineering degrees provide a sound and relevant basic education in engineering science. There is a need to strengthen the professional elements in engineering education. A new four-year degree, placing emphasis on engineering design and wider industrial studies is described. The first graduates will finish their course in 1981.
A Novel University Approach to Teaching Microelectronics
Authors: Poole K. F.
Published: May 2015

The article discusses the use of uncommitted integrated circuits as a vehicle for training electronic engineers in the circuit design and technology of microelectronics.
Im It*GI?
Authors: Hancock N. N.
Published: May 2015

It is well known that Re I t* GI represents the mean torque of an a.c. machine in terms of complex matrices. The significance of Im I t* GI is considered and it is shown that no corresponding generalisation can be made.
A Regenerative Loading Rig for Electrical Machines Laboratories
Authors: Smith G. A.
Published: May 2015

The regenerative loading rig is a three-phase thyristor rectifier providing motoring and braking torque to a d.c. dynamometer. The rig is designed to simulate braking and overhauling loads for efficient testing of both a.c. and d.c. machines.
Cognitive Levels in a Basic Electrical Engineering Course
Authors: Waks S. , Lindenlab J.
Published: May 2015

An analysis of cognitive levels in a basic electrical engineering course has shown some limitations of Bloom's taxonomy. The problem solving taxonomy suggested by Dean and Plants tends to be more adequate for engineering education. This issue is illustrated by examples from a basic electrical engineering course (linear circuit analysis)
An Electronics Workshop for Recent Graduates
Authors: Kasim T. A.
Published: May 2015

A workshop in electronics has been designed at the University of Lagos. It is an intensive programme which is based on the response to a questionnaire by recent Nigerian graduates. The programme consists primarily of laboratory tutorials and projects. Furthermore, the final project is a ‘take-away’ finished product.
A Diagram of the Relationships among the Basic Quantities of Electromagnetism
Authors: Curtis G. H.
Published: May 2015

The relationships in electromagnetism can be confusing because of a circularity in definitions. These relationships are clarified by means of a diagram showing a sequence of definitions. Without changing the sequence, the various quantities can be defined at several levels of sophistication.
Variable Frequency Filtering via Chirp Transform
Authors: Lam F. K. , Tsang W. M.
Published: May 2015

A simple programmable chirp-transform band-pass and/or band-stop filter has been implemented using ultrasonic strip dispersive delay lines. Experimental results demonstrating the capability of the system are presented. In addition to processing applications, the system may also be employed as a teaching tool for illustrating concepts in spectral analysis.
Digital Filtering Using the Intel 2920 Signal Processor
Authors: Terrell T. J. , Simpson R. J.
Published: May 2015

The concepts of single-chip digital Filter implementation are presented via a student-oriented tutorial/laboratory case study. This involves the design of lowpass, highpass, bandpass and bandstop digital filters using the bilinear z-transform method. Concurrent implementation of the Filters using the Intel 2920 single-chip signal processor is described.
Communication Studies: An Alternative Programme
Authors: Marshall Stewart
Published: May 2015

Two of the major problems involved in teaching communication studies to electrical engineering students are motivating the students and creating favourable attitudes towards the subject. This paper describes how these problems can be overcome by using an electrical engineering game as a focal point for the course.
Time-Dependent Complex Quantities and Instantaneous Complex Power
Authors: Torrens A. B.
Published: May 2015

It is shown that, in the analysis of a linear system in sinusoidal steady state, time-dependent complex quantities (voltage, current, etc.) afford the same convenience as time-independent phasors, for example in writing equations in terms of complex impedance or gain. They provide a logical, mathematically sound approach to the complex notation, and to the definition of instantaneous and average complex, active and reactive powers.
A Property of Networks concerning Changes in the Generators Acting in Them, with Some Applications
Authors: Moreno E.
Published: May 2015

It is established that when the voltages imposed by the generators in a network are changed, the sum of the crossed products of voltage and currents before and after the change is constant. Some applications are discussed.
On Active and Reactive Power Flow in Electrical Machines: A Unified Analysis
Authors: Palit B. B.
Published: May 2015

Power flow in electrical machines has been analysed by means of Poynting's theorem. First, a general theory has been developed. Later, this theory has been applied unifiedly to several types of electrical machines. The power flow method affords a deeper physical understanding of the operation of electrical machines.
Power System Convertor Harmonics
Authors: Yacamini R.
Published: May 2015

A brief outline of convertor harmonic theory is given. The paper also describes the non-linearity which generates the harmonics in large convertors. A summary is given of the recent work carried out by the author and colleagues on the calculation of harmonics in non-ideal convertors with both ac and dc impedance represented.
Harmonics Caused by the Various Types of Transformer Saturation
Authors: Yacamini R.
Published: May 2015

Transformers can be saturated due to d.c., single sided asymmetry, or double sided overfluxing. This paper describes methods of calculation and results of how the associated harmonics affect the a.c. system.
The Need for Standards Limiting the Power System Disturbance Caused by Pulse-Burst Modulation Control
Authors: Emanuel Alexander Eigeles
Published: May 2015

This paper reviews the types of disturbances caused by Pulse Burst Modulation Control and explains a number of remedial methods which help eliminate or reduce the undesirable d.c. injection in the power network and the generation of current pulses within the neutral wire. The need for adequate standards is emphasized.
Recent Developments in the Design of Microcomputer System Components
Authors: Depledge P. G.
Published: May 2015

This paper outlines the major developments that have taken place during the last three years in the design of microcomputer system components. The emphasis is on the ways in which the continuing increases in device integration levels have been used to improve the quality of microprocessor components. In addition consideration is given to how the implementation of ‘software on silicon’ is starting to affect component design.
A Practical Approach to Digital Integrated Circuit Design Using Uncommitted Logic Arrays
Authors: Hicks P. J.
Published: May 2015

Uncommitted logic arrays or gate arrays provide a fast and cost-effective means of producing digital L.S.I, circuits. Their increasing popularity has created a need for engineers who are skilled in this new technology. Students on a one-year M.Sc. course are able to gain practical experience of logic design using gate arrays and are motivated by the opportunity to characterise and test the finished product.
Production of Microelectronic Components at Umist
Authors: McKell H. D.
Published: May 2015

The UMIST semiconductor device manufacturing facility, set up, primarily, to make possible the familiarisation of undergraduate and postgraduate students with many of the fundamental processes in microelectronic technology, is described. The range of activities currently undertaken is outlined, and the direction of future development indicated.
Microelectronics Teaching at the University of Canterbury, New Zealand
Authors: Edward L. N. M.
Published: May 2015

Teaching of integrated circuit engineering in New Zealand initially involved establishment of a Thick Film Hybrid Microelectronics Laboratory. Students now gain ‘hands-on’ experience using high quality equipment and processing standards which ensure commercially viable results, leading to increased confidence and satisfaction. Course structure is illustrated with typical projects.
Microprocessor Engineering and Digital Electronics: An Example of an M.Sc. Course at Umist
Authors: Hartley M. G.
Published: May 2015

The paper discusses the M.Sc. course in Microprocessor Engineering at UMIST. Students attend for two terms, take written examinations and then carry out a dissertation project forsix months. Syllabuses are considered and dissertation arrangements discussed, in the hope that this may be useful to others establishing similar courses.
A Laboratory Equipment for Investigating Switching Overvoltages
Authors: Binns D. F. , Whitehouse D.
Published: May 2015

A detailed description is given of a transmission line model and voltage source suitable for demonstrating switching overvoltages associated with overhead line energisation. The model is 3-phase with the supply electronically switched independently in each phase and incorporating switched closing resistors. Typical voltages at the line end are presented.
Static Inverters for Industrial Process Heating
Authors: Hobson L.
Published: May 2015

Types of static inverters used for induction heating and melting are described and categorised in a manner suitable for the incorporation of the material into engineering courses of all kinds.
On the Synthesis of Resistively Double-Terminated LC Ladder Networks
Authors: Ho C. F.
Published: May 2015

Resistively double-terminated LC ladder network can be made inherently insensitive to variations of its elements. This article presents a method for the synthesis which, unlike the two existing techniques, does not require the determination of roots of polynomials. Thus, the procedures of calculation are less involved. An example is given.
Superposition Principles in the Analysis of Circuits with Choppers and Inverters
Authors: Pantic Borislav O.
Published: May 2015

Instead of the use of Fourier series analysis, transient and steady-state processes in the circuits with choppers and inverters have been presented by means of geometrical progressions. Therefore, the solutions for the instantaneous, transient and steady-state currents developed for the analysis of such circuits are explicit and exact.
LINSIM, a Linear Electrical Network Simulation and Optimisation Program
Authors: Edward L. N. M.
Published: May 2015

On-line computer-aided-design programs must be versatile, easy to use, reliable, and virtually ‘crash-proof. LINSIM is such a package which has been used by students and engineers at the University of Canterbury, New Zealand, for the past three years. Its structure and use are described and illustrated.
An Instrument for Measuring Step Motor Characteristics
Authors: Jones D. I.
Published: May 2015

An instrument is described which has been used in an undergraduate laboratory to illustrate the basic characteristics of step motors. The instrument is microprocessor based thus providing flexibility and ease of adaptation to the needs of various users. Some typical results from the measurement system are presented.
Stepping Motor Technology for Undergraduates
Authors: Acarnley P. P.
Published: May 2015

A first-year undergraduate experiment on a microprocessor-controlled stepping motor system is described. The experiment provides a basic introduction to such important concepts as real-time programming and interfacing techniques, as well as giving an appreciation of stepping motor performance and control strategies.
Amplitude Range and Nonlinear Distortion in Amplifier Stages
Authors: Martinez Pedro A. , Pollan Tomas
Published: May 2015

This paper presents a general description of the inherent transistor limitations affecting the linearity of its performance in its typical amplifying region. A unified treatment, for bipolar junction transistors and for the different types of field effect transistors, has been developed relating the Q-point location of an amplifier stage with the output amplitude and the nonlinear distortion.
BIMRIM, a Mutual Inductance Algorithm for Use with Nodal Analysis Programs
Authors: Edward L. N. M.
Published: May 2015

Incorporation of general mutual inductance in a purely nodal (admittance) analysis program is facilitated if an uncoupled equivalent inductor array is first generated from the explicit self and mutual inductances in the network. This paper derives an appropriate algorithm and presents a FORTRAN realisation, easily grafted to an existing program.
Measurement of Residual Flux in Permanent Magnets
Authors: Bhargava S. C.
Published: May 2015

A simple and accurate method, using a search coil and a calibrated fluxmeter, is presented for experimental determination of residual flux of permament magnets of simple geometries. Applied to a small rectangular AlNiCo-VI magnet used variously, the method shows the importance of preventing accidental, or otherwise, demagnetisation of permanent magnets.
The Goals of Engineering Education Project: Engineering as a Vocational Preparation
Authors: Beuret Geoff , Rule Joanne
Published: May 2015

The Goals of Engineering Education Project examined the appropriateness of British engineering education through sampling the opinions of its ‘customers’, engineering graduates and their colleagues. It is argued here, using data from the project, that engineering education does not constitute the thorough vocational preparation needed by engineers and industry.
The NEC μPD7720 Digital Signal Processor — A Laboratory-Based Case Study
Authors: Terrell Trevor J. , Simpson Robert J.
Published: May 2015

The concepts of single-chip digital signal processing are presented via a student-oriented tutorial/laboratory case study. This involves the design of a highpass digital filter using the first-difference design method and its implementation using the NEC μPD7720 Signal Processor.
The Formation of the Bus Impedance Matrix and the Solution of Power System Networks
Authors: Willems J. L. , Brameller A.
Published: May 2015

This note deals with the computation of the impedance matrix and the solution of the voltages of a power system, by adding one branch at a time. The technique is straightforwardly derived from general matrix theory results or from circuit theory concepts.
The Learning Process — A Model Based on an Engineering Approach
Authors: Waks S.
Published: May 2015

A model is presented for analysing the learning activity through an engineering approach. The main components are: input (raw data), elaborational phase (data processing), output (processed data) and conditions of learning (bias). The components are interconnected in a closed loop feedback pattern, including ‘impedance matching’ to optimise the learning process.
Multivariable System Laboratory Experiment
Authors: McLaren S. G.
Published: May 2015

A laboratory experiment, designed as a teaching aid for courses on multivariable control systems is described. This involves simulating a two-input/two-output system on a small 6-amplifier analogue computer. The effects of interaction, pole and zero shifting can be observed.
Transient Field Flux in a Synchronous Machine
Authors: Arnold C. P.
Published: May 2015

A non-rigorous method of explaining the transient electrical differential equations accounting for changes in field flux in synchronous machines is presented.
Women in Electrical Engineering Education
Authors: Buckley Anne
Published: May 2015

This paper comprises a series of individual profiles of the very few women who are currently teaching electrical engineering or electronics in universities or polytechnics in the U.K.
Teaching Electronics at a Distance by Cyclops: An Assessment of the Telewriting System
Authors: Howe A. F. , McConnell D.
Published: May 2015

CYCLOPS is a telewriting scheme for tutoring students at a distance. The system, which uses a telephone-conferencing network, provides interactive graphical and verbal communication. Diagrams, which are displayed on television monitors, are created and amended with light-pens. Complex drawings may be pre-recorded on audio cassette tapes.
A Simple Technique for Non-Contact Sensing of Angular Speed
Authors: Ahmad Wasim
Published: May 2015

The method presented uses a simple capacitive transducer with a signal modifying circuit which generates pulses with frequency proportional to the angular speed. The technique is simple, reliable and easily realizable for laboratory demonstrations.
Introduction of Electronic Design to An Engineering Science Core Course
Authors: Bland R. J. , Cobley R. A.
Published: May 2015

The role of electronic design as part of an Engineering Science course at Exeter University is described. The approach adopted involved small groups of students developing solutions to electronic design problems. Three years' experience of the projects undertaken is outlined, together with the course assessment.
Use of An LSI 11 Computer System Facility for Enhancement of An Undergraduate Power Laboratory
Authors: Richardson J.
Published: May 2015

A procedure is described whereby students can enter results into an LSI 11 computer system from initial tests on experimental equipment in a power laboratory. Performance figures and digitally plotted curves are then produced which can be used to verify load tests at a later stage.
Use of the Castle Mask in Teaching Synchronous Detection and Waveform Analysis
Authors: Geake J. E.
Published: May 2015

A castellated mask, used to obscure alternate sections of a waveform, is useful in teaching the properties of the phase-sensitive rectifier, the process of Fourier analysis of a square wave, and the method of detection of a radio signal — especially one that is suppressed-carrier amplitude modulated.
Tuning of PID Controllers for First and Second-Order Lag Processes with Dead Time
Authors: Min Lim Choo , Cheng Tan Wan , Seng Lee Tuck
Published: May 2015

A method for tuning PID controllers for a class of processes with dead time is presented. The controller settings are so determined that the overall system output satisfies a predefined control objective. Effectiveness of the proposed method for tuning controllers is illustrated by means of numerical examples.
A Transconductance Model in Amplifier Stages-Part 2: Systematic Method of Midband A.C. Analysis for Transistor Amplifiers
Authors: Martinez Pedro A. , Pollan Tomas
Published: May 2015

A method for a.c. midband analysis in transistor amplifiers with no feedback loops is presented. This process is easy to apply and can be used to determine the characteristics of the structure in its two versions, both B.J.T. and F.E.T. Three typical amplifiers are shown to illustrate the effectiveness and simplicity of the method.
An Auto-Ranging Phasemeter
Authors: Kulkarni D. V.
Published: May 2015

Large differences in input levels cause inaccuracy in phasemeter readings. In this new instrument both input voltages are taken to a constant level before application to the phase detector, so that constant accuracy is obtained up to a 60 dB input ratio between 10 Hz and 100 kHz.
Charles Babbage — Father of the Digital Computer
Authors: Hartley M. G.
Published: May 2015

A recent book by Anthony Hyman sets the work of Babbage into a broader context than that revealed by earlier writers and in particular emphasises the importance of his contacts with the international scientific community. This present paper reflects these new insights. It is offered as an example to young engineers.
Two Introductory Experiments in Electromagnetics
Authors: Clark A. D. , Freer R.
Published: May 2015

Two experiments based upon the investigation of magnetic field patterns round short solenoids are described. A variety of measuring devices are employed including Chattock's magnetic potentiometer, spatulate and compound concentric search coils. Typical results and an outline of the special features are provided for each experiment.
The Time Domain Analysis of PWM Systems
Authors: Pantic B. O.
Published: May 2015

This paper describes how superpositional principles can be employed to formulate the response of an R, L circuit which is subjected to PWM voltage waveforms. Explicit expressions are given for the current and power dissipated in the circuit.
Laboratory Simulation of Induction Tube Welding
Authors: Hobson L. , Taylor A. , Woodcock A. H.
Published: May 2015

An advanced laboratory exercise is outlined in which the industrial technique of induction tube welding is simulated on a laboratory scale. Details are given of the different measurement techniques used. This experiment may be used to introduce basic electrical engineering topics into engineering disciplines of all types.
Laboratory Measurement of Optical Fibre Communication Parameters
Authors: Wilson B.
Published: May 2015

A teaching laboratory experiment to measure the main engineering parameters of an optical fibre is described. Using relatively inexpensive equipment, the fibre length, attenuation per unit length and bandwidth-distance product of a PCS fibre are calculated. The approach is easily adaptable for use by 2nd year or final year undergraduates and M.Sc. course students, depending upon the detail and complexity presented in the experimental script.
Design, Fabrication and Test Techniques for Microstrip Transmission Lines
Authors: Benson T. M.
Published: May 2015

The background to and methods for an experiment on the design, fabrication and test of microstrip circuits are presented. The experiment is intended to complement final year of undergraduate or M.Sc. level electromagnetics sections of Electrical and Electronic Engineering courses. The circuits are fabricated using p.c.b. techniques thus keeping costs to a minimum.
Simple Search Technique for Generating Unit Commitment
Authors: Fox B. , Bond S. D.
Published: May 2015

A method is presented for solution of the generation unit commitment problem. The binary search is structured to allow incorporation of an existing dispatch algorithm. An example is presented illustrating the method's speed advantage over the branch and bound technique when an initial upper bound is not known.
The S.I. Ampere and Volt—An Example of Electrical Metrology
Authors: Kibble B. P.
Published: May 2015

Some fundamental principles underlying the whole of present-day electrical metrology below microwave frequencies are exemplified in the new N.P.L. realisation of one of the S.I. electrical units with the moving-coil apparatus. The measurements are described with the aim of illustrating these principles.
Eval — An Expert System for Evaluating Written Reports
Authors: Marshall Stewart
Published: May 2015

As an assignment for the course ‘Verbal Communication’, undergraduates in their fourth year of an Electrical Engineering degree were asked to write reports evaluating three microcomputers. What was unusual for this particular class was that their ‘microcomputer evaluation reports’ were then evaluated by a microcomputer. This article describes a simple ‘expert system’ which assists the tutor in the evaluation of written reports.
Tree Enumeration from the Incidence Matrix
Authors: Adby P. R.
Published: May 2015

Cyclic tree generation via the outer product of vectors in determinant evaluation by Grassmann's algebra yields an algorithm for symbolic circuit analysis with a particularly simple test applicable to the enumeration of symbolic terms in both numerator and denominator of transfer functions of active circuits.
An Undergraduate Power Electronics Laboratory
Authors: Robinson I. M.
Published: May 2015

The development of an undergraduate laboratory supporting the teaching of power electronics and electrical drives is described. This laboratory is used for standard experiments, but more importantly has led to the introduction of student-centred hardware and software design exercises. Such studies have improved student awareness of power engineering without detracting from the overall emphasis upon electronics within their course.
Tuning of a D.C. Motor Position Servo Controller Using Tutsim
Authors: Waller Michael H. , Wellstead Peter E.
Published: May 2015

This paper discusses the use of the TUTSIM microcomputer package for simulating a d.c. motor servo positioner. The use of TUTSIM and its commands for tuning a proportional-derivative controller is illustrated for this simple example while examining the response to a step set-point change.
Some Effects of Electric Fields on Living Creatures
Authors: Watson D. B. , Neale I. A.
Published: May 2015

The mobility of the fruit fly Drosophila melanogaster is reduced when subjected to a 50 Hz electric field. A directional effect also occurs. A prototype electrical barrier suppresses penetration by flying at 400 kV/m, and penetration by crawling is reduced to 6% after 10 minutes at 640 kV/m.
VLSI Design at the Undergraduate Level
Authors: Swanson J. G.
Published: May 2015

This paper describes the experience gained in teaching a VLSI design course to students in the final year of a three-year course in Electronic Engineering. Each of the twenty students designed and tested their own full-custom CMOS integrated circuit within one academic year.
The Response of a Self-Excited Induction Generator to Rectifier Harmonics
Authors: Watson D. B. , Duke R. M.
Published: May 2015

The paper describes a self-excited induction generator connected through a controlled rectifier to a resistance load with no smoothing reactor. A harmonic analysis of the rectifier input current is presented. The current harmonics cause distortion of the generator voltage waveform, and the possibility of harmonic resonance exists.
Signal Reconstruction in High Voltage Engineering
Authors: Nagasaka D. M. , Raghuveer M. R.
Published: May 2015

This paper points out the relevance of signal reconstruction in high voltage engineering and the advantage of considering constrained methods. The application of the constrained least squares and the constrained iterative reconstruction techniques, in the frequency domain, is discussed.
Low Cost Isolation Amplifier
Authors: Yeung W. K.
Published: May 2015

A simple and low cost isolation amplifier is proposed as general student laboratory equipment which is used to monitor signals with a high common mode voltage, as the common practice of monitoring such signals with unearthed equipment may be dangerous. Different input and isolated output waveforms are also presented.
Laplace Transforms and the Amplitude Transients
Authors: Filanovsky I. M.
Published: May 2015

The direct Laplace transform with a finite upper limit of the integral is considered. This form is useful for evaluation of transients when the input is an amplitude modulated cosinusoidal pulse. In this case the inverse transform is easily calculated and the equation of amplitude transients can be established.
A Slip-Dependent Circuit Model for the D.C. Motor
Authors: Watson D. B.
Published: May 2015

A variable-resistance model is derived for the d.c. motor. It is applicable to steady state and transient analysis. The d.c. motor is compared with the induction motor.
A Single-Phase Self-Excited Induction Generator for Lighting Loads in Remote Areas
Authors: Singh Bhim , Saxena R. B. , Murthy S. S. , Singh B. P.
Published: May 2015

For a self-excited single-phase cage induction generator, the possibility of few discrete capacitor steps to keep the terminal voltage within specified tolerance at different loads, is evolved for implementing a simple regulating scheme. The capacitance/reactive VARs requirements for the generator are also obtained to maintain constant terminal voltage at various loads.
Experience in Keeping up with the Literature
Authors: Walker A. J.
Published: May 2015

This contribution describes a relational database reference management system augmented with purpose-built information analysis software. The benefits which have accrued from the use of this facility include: rapid publication of outstanding research results, increased sensitivity to current issues and the rapid accumulation of material for advanced courses.
The Teaching of Electronic Circuit Design: A Project Approach
Authors: Jackson R. D. , Wilmhurst T. J.
Published: May 2015

An undergraduate design and build project, intended for classes of students working individually or in pairs, is described. At low cost, to a given specification, a simple data-logger is designed, fabricated on pcb, and tested. Examples of design guidance, organisational and cost details, and student results are given.
A Simple Circuit for Laboratory Generation and Demonstration of Signals Representing Binary Data
Authors: Ahmad Wasim
Published: May 2015

A simple and compact circuit is described which can be used to generate the various forms of signals representing binary data simultaneously. It is quite useful for laboratory demonstration and testing. The experimental results are found quite satisfactory.
URISC: The Ultimate Reduced Instruction Set Computer
Authors: Mavaddat Farhad , Parhami Behrooz
Published: May 2015

URISC is a single-instruction universal computer which appears to be ideal for introducing basic computer organization concepts to novice students. In this paper, the specifications of URISC are given and complete implementations of its control unit are presented. The authors' experiences with the use of URISC in the classroom environment are discussed briefly.
The Development of an Undergraduate Curriculum for VLSI Design
Authors: Massara R. E. , Green A. D. P. , Mack R. J. , Noakes P. D.
Published: May 2015

This contribution describes the way in which the ECAD facilities have been exploited in the development of an undergraduate curriculum for the teaching of IC design in an Electronic Systems B. Eng. degree scheme. The programme of course and laboratory work culminates in a final year core course in Microelectronic Circuit Technology and Design together with a specialist option in VLSI Systems Design which includes chip fabrication activities.
ASIC Design, the SOLO 1000 Tool Set, and BTEC Courses
Authors: Lawday G. L. , Forbes R. G.
Published: May 2015

Bracknell College now offers the first BTEC-approved Higher Certificate modules in semi-custom design methods in the UK. Practical design exercises involve the ES2 SOLO 1000 toolset. This article outlines the content and philosophy of the modules and the preparation for introducing them, including our own experiences with the tools.
Introducing Students to Electronics Computer Aided Design
Authors: Proudfoot J. T. , Mawby P. A.
Published: May 2015

This paper describes how ECAD was introduced into a typical Electrical Engineering degree course. The structure of the ECAD module is presented, together with its integration into the course. The module exercises are described and the paper concludes with observations of their success, together with planned developments for future years.
The Design of Cmos Gate Arrays as Student Undergraduate Projects
Authors: McGinnity T. M. , Jones S. G. , Dowdle M. , Birkinshaw K.
Published: May 2015

The design and fabrication of TAHC06 and TAHC10 gate arrays has been undertaken by students studying for a degree in Microelectronics and Computing. This paper describes the incorporation of such ECAD work into an undergraduate degree programme and discusses progress by reference to specific project examples.
Commercial ECAD Software in an M.Sc. Gate Array Design Exercise
Authors: Mackle J. , Magill S. H. S. , Campbell D. H. , Montgomery J. H.
Published: May 2015

By incorporating a variety of commercial ECAD software into a gate array design exercise, students on a one-year MSc in Electronics are able to gain both practical and diverse experience in industrially relevant semi-custom design techniques.
Asic Technology Appreciation: A ‘Hands-On’ Approach
Authors: Jones H. L.
Published: May 2015

With the aim being to expose large numbers of degree students to the practical details of a semi-custom circuit design cycle, a case study of a second year degree group project, which resulted in custom chips being manufactured, using the QUDOS ‘MINICHIP’ gate array design suite is presented. Administrative objectives are discussed together with an analysis of the chip samples received.
Using Silvar-Lisco for Logic Cell Array Design
Authors: Bolton Martin , Milford David
Published: May 2015

Instead of gate arrays, the logic cell array (LCA) has been used as the implementation medium in an undergraduate design exercise. Software has been written to link the SL-2000 database to the LCA layout and routing system (XACT). The result has been improved student motivation and a higher proportion of completed designs.
Warnier-Orr: An Electronic Hardware Design Methodology
Authors: Curtis K. M.
Published: May 2015

The paper considers the application of a well-known computer programming methodology to the design of electronic circuits. Parallels are drawn between real-life situations, computer programs and electronic circuit design. Examples of the application of the methodology are given in each case.
Analogue Current Mode Circuits
Authors: Wilson B.
Published: May 2015

Circuits designed to use current as the active parameter can often outperform by a significant margin the more traditional voltage mode formulations. Many wideband circuit functions and new design opportunities are available by using current mirrors and current conveyors as basic building blocks.
The ‘Dozen-Impedance’ Operational Amplifier Module for Experimentation
Authors: Kehinde L. O.
Published: May 2015

This paper presents a ‘dozen-impedance’ op. amp. configuration that can be used for a myriad laboratory experiments on op. amps. From the generated transfer function, a new formalized statement is presented from which the transfer function of op. amp. circuits that fall under this class can be obtained without the rigours of earlier well-known matrix techniques. Some experimental configurations are suggested.
An Integrated Experiment in Field Theory
Authors: Walton A.
Published: May 2015

The various means available for the solution of field problems are reviewed and the solutions for a simple problem, that of the fringing field between the pole and armature of an electric machine, obtained using three methods; direct field plotting, Schwartz-Christoffel transformation and finite elements are presented.
Hard Assessment with Soft Tools
Authors: Collier Michael
Published: May 2015

A critical discussion of the way in which software skills are assessed in Higher Education forms the basis of the paper. Proposals are made for the utilization of software tools in providing grades and feedback to students, and an interactive UNIX test developed at Plymouth Polytechnic is described in detail.
Effects of Size and Speed on the Performance of A.C. Motors
Authors: Rajaraman K. C.
Published: May 2015

The effects of size and speed on the performance of an induction motor are brought out by expressing the performance figures in terms of the per-unit parameters, and the parameters themselves in terms of the dimensions and speed. The article seeks to fill a gap in text-book treatments.
Synchronous Machine Transient Stability Analysis by an Extension to the Point by Point Method of Solution of the Swing Equation
Authors: Karunaratne S. , Wijayatunga P. D. C.
Published: May 2015

This paper presents a modification to the point by point method of solution of the swing equation, used in the analysis of transient stability of synchronous machines. This modification permits the swing equation to be solved in the presence of electromagnetic damping which is not possible in the original method.
On Phasor Methods for A.C. Analysis
Authors: Byrne Peter C.
Published: May 2015

Kirchhoff's laws are considered for the special case of sinusoidal excitation and phasor formulations are obtained in a coherent manner. It is shown that the phasor diagram may be obtained directly from the circuit diagram by replacing the circuit symbols by complex numbers while maintaining the original orientations.
Graphic Presentation of Fundamental Laws of Electromagnetism
Authors: Nadolska Ewa A. Lipowska
Published: May 2015

This paper describes a graphic presentation of relations between electric and magnetic fields with four basic circuit elements RLCM.