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Electronic-Engineeri ••• Semiconductor lasers provide c rrier and optical confinement I The ....a 1 17,13/Artsly innumfflumgmommummulik\ brandnew eaning to ély cost Connector.... effectiveness Our new 'D' connector is de- Installation couldn't be signed to lower your installed easier; simply insert the cost through exclusive T&B/ cable into the connector Ansley mass termination housing, locate assembly techniques. into standard BLUE MACS TM Utilising our proven insula- tooling, then terminate. tion-displacing TULIP R con- Available at present in 25 tacts in aspread pitch design, and 37 way plug and socket enables this 'D' connector to connector versions, our 'D' be terminated at any point, connector is ideally suited to standard 0.050" pitch flat for both internal and external cable, while at the same time cabinet interconnections by being intermatable with exist- using our standard U.L. listed ing 'D' type connectors. round-conductor flat cable Termination reliability, as or our U.L. listed jacketed with all other BLUE MACS TM flat cable — engineered connectors, is assured by self specifically for external cabi- aligning cable grooves which net use. automatically position the For further information, cable over the TULIP Rcon- circle the enquiry number or tacts. contact us direct. The one-piece connector design with mechanical side latches, maintains the integ- rity of the connector before, Enquiry no. 171 for the 'D' con- during and after the termina- nector only. tion cycle, eliminating the Enquiry no. 172 for the 'D' con- need for complicated ass- nector and BLUE MACS :rm CablelCon- embly operations. nector System. pttpm.,01.›. P1. 1.1 1'172 Sedgwick Road, Luton LU4 9DT. Tel: Luton (0582) 597271 Editor Brian J. Jennings Technical Editors Peter Gebler BA Elaine Williams BSc electronic Group Editorial _ Consultant Lord Avebury BA CEng MIMechE MIMC Art Editor Adrian C. Day Circulation Manager engineering H. S. Gibbs Vol 48, no 586 December '1976 Reader Service Manager Grace Wall 4 Comment and Readout: Common Market?; low cost design aid; Marconi opens pcb plant; fibre optic Advertisement Manager Patrick Flynn monitoring; cable plant set up; waveguide trials; development aid for 6800; add on memory; Scopex hails Northern Area Manager successor; support for cosmac; oscilloscope launch; Peter T. VVesthead industry predictions. 061-928 9801 Publisher 17 Applied Ideas: Steam engine whistle simulator circuit; Peter Jago low power cmos switch debouncer; reduction of amplifier offset and drift; current to frequency converter without insulation; complement adders give unambiguous Electronic Engineering is zero output; flip flops help in multiplexing control bits; published monthly and is ram storage adaptor for oscilloscope; hex inverter and or distributed free of charge in the gates for frequency doubler; low power cassette data United Kingdom to designers, recorder; constant speed for apermanent magnet motor; engineers, researchers, technical management, and approved automotive battery voltage indicator for 12 V; programme authorities, in industrial and generates n phase oscillations. scientific establishments 41 Narrowbeam five layer heterostructure lasers: A manufacturing and using variety of (GaAl)AsIGaAs devices have been fabricated electronic components and using two pairs of heterojunctions, G H B Thompson et al, equipment. It is also available to others in the U.K. and overseas explain the characteristics and research undertaken for at an annual subscription rate of these devices. £12.50 (or $37.50 in North and 49 The software challenge for microprocessor South America). Single copy engineers: Microprocessors are likely to become an price is £1.50. essential tool for the electronics engineer. Alan Potton explains how to understand and use them. Notice to overseas readers 59 Design considerations for optically coupled A number of advertisers, at their isolators: In this article Chris Williams describes the own request, do not appear in opto -isolator families and ways of obtaining optimum the world-wide edition. This performance. unavoidably interrupts the page sequence, but does not affect 65 Failure mechanisms in cos/mos integrated circuits: the editorial content. This article discusses the reasons for failure in these circuits. Gallace and Pujol explain how some of these may dWI IG, .0 1976 be avoided, 73 Digital logic board design with test needs in mind: Morgan-Grampian (Publishers) As digital logic ic's become more complex the requirement Limited for testing digital systems becomes more critical, writes Morgan-Grampian House David Tose. 30 Calderwood Street London SE18 6QH 77 Advances in medical electronics: There are several Telephone 01-855 7777 interesting developments in the medical electronics field. Telex 896238 (lndustpres Ldn) The use of lasers and ultrasonics provides both powerful diagnosis and treatment facilities writes Elaine Williams. ABC 89 Product Focus: This month Brian Jennings looks at the This month's cover depicts connectors market, the Amphenol range of Merlin connectors which are 106 New Products used for military, Aerospace 120 New Data and other areas where weight is an especially 126 Classified Advertisements important consideration in design. 128 Advertisers Index 4 on enquiry card 111.111111111111111.11111inina .........m. immimulumn am mum umummaiummuswe 11111111111.111111111111111111111111111111181110111101.11Mallialin Iii11111111111111•111111111111111111111111.11111ilinnill 111111.1.1111111111111PeRIMINIIIMI0111111111111 a 11111. 11118 1111.1111M111111111111111111111111111111111111311111111111IN 1111111111111011"-L......, 11111111111111111111111111111111111111111111111111 111111111111111111111111111•111111111111111111111111111111111111111 111111r-41111111111111111111ik— '1111110111111111111111111111111111111111011M 111111 .1111111111.111111111 13M111111111MMIIIIIM1111111.1 1111111111111111111111111113111111111111b.-... 11111111111111111.11111111111111 Fag 11181. 111111111.11• 11=1.11111.11111111a111111111 0111111111111M11111111111.11111111111i. , 11111111111111111111111111111 II i1111111111111111.111 1111111131111111111111111111 11111111•111111111111M11•111111111._ 11111111111111111111111111111 111111111•11111111111111111 1111111111MMIIMIMIIII111111111111111111111111 L.ill111111311= 111111 11111 III ZIIIIIIRIIIIIZIII BIM 11111111111111 IIIIIIII MI II IIIIIIIIIIIIIIIIIIIIII 0111.1111•11111111111 IMIIIIM MI III II MM. 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