`
`Dictionary of Electronics
`Fourth Edition
`
`8. W. Amos, CEng, BSC, MIEE
`
`R. S. Amos, BD, BSC, MISTC
`
`Appendix by
`G. W. A. Bummer, MBE, CEng, FIEE
`
`VJ
`
`Newnes
`
`OXFORD AMSTERDAM BOSTON LONDON NEW YORK PARIS
`
`SAN DIEGO SAN FRANCISCO SINGAPORE SYDNEY TOKYO
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`
`
`Newnes
`
`An imprint of Elsevier Science
`Linacre House, 10rdan Hill, Oxford OX2 8DP
`225 Wildwood Avenue, Wobum, MA 01801-2041
`
`First published 1981
`Reprinted 1982, 1986
`Second edition 1987
`Third edition 1996
`
`Reprinted 1997, 1998
`Fourth edition 1999
`
`Reprinted 2000
`Paperback edition 2002
`
`Copyright © 1999 Elsevier Science Ltd. except Appendix (pp. 359-389)
`Copyright © 1999 G. W. A. Dummer. All rights reserved
`
`No part of this publication may be reproduced in any material form (including
`photocopying or storing in any medium by electronic means and whether
`or not transiently or incidental] to some other use of this publication) without
`the written permission of the copyright holder except in accordance with the
`provisions of the Copyright, Designs and Patents Act 1988 or under the terms of
`a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road,
`London, England WIT 4LP. Applications for the copyright holder’s written
`permission to reproduce any part of this publication should be addressed
`to the publisher
`
`British Library Cataloguing in Publication Data
`A catalogue record for this book is available from the British Library"
`
`Library of Congress Cataloguing in Publication Data
`A catalogue record for this book is available frOm the Library of Congress
`
`ISBN 0 7506 4331 5
`
`Printed and bound by Antony Rowe Ltd, Eastboume
`
`For more information on all Newnes publications
`please visit our website at www.newnespress.com
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`blanking level ------
`
`
`-—-.-—
`
`sync level .........
`
`Figure L.8 Waveform of television line sync signal
`
`line time base In TV the circuits responsible for generating the signals
`causing horizontal deflection of the scanning beam.
`In modern TV
`receivers the line output stage generates, in addition to the line scanning
`current, a direct voltage to boost the supply to the output stage, the heater
`supply for the picture tube,
`the EHT supply for the picture tube and
`possibly a low-voltage supply for early stages in the receiver.
`liquid crystal display (LCD) A display system consisting essentially of a
`very thin layer of liquid sandwiched between two conducting glass plates
`between which the control voltage is applied. One way in which the applied
`voltage controls the light transmission of the device is by varying the light
`scattering in the liquid which is specially chosen because. of its long-
`molecule construction. The conducting areas of the plates are such that, by
`applying voltages to certain of the leads, specified areas of the display can
`be illuminated by light transmitted through the device or reflected at the
`rear glass plate. Thus a seven—segment pattern can be used to give a
`numerical display.
`Liquid crystal displays consume very little electrical power compared
`with light-emitting diode displays and have superseded LEDS in battery-
`operated calculators and digital watches.
`‘
`Lissajous figures Patterns generated on the screen. of a cathode ray tube
`when the electron beam is defected horizontally and vertically by
`sinusoidal signals with a simple relationship between their frequencies.
`Some typical patterns are shown in Figure L.9.
`
`
`
`(a)
`
`(b)
`
`(c )
`
`Figure L.9 Some typical Lissajous figures
`
`Litz wire See skin effect.
`L-network A network consisting of one series and one shunt element. See
`Figure 1.10.
`‘
`load (1) Of any signal source the circuit connected across its terminals and
`into which it delivers power. See anode load. (2) In computers and data
`
`186
`
`
`
`
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