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淘豆网网友近日为您收集整理了关于Electronics Today International (ETI UK edition) 1988 11的文档，希望对您的工作和学习有所帮助。以下是文档介绍：Electronics Today International (ETI UK edition) 1988 11 S tNcLUDE V AT * PROMPT DELIVERIES * FRIENDLYvvor d w dp repulatron lor oual l\ relrabrl ly and performance at a realtstrc pnce Four mode sava able 1o surt the needs of the prolessronal and hobby market I e, lndustry, Letsurelnstrumental and H Fr etc parng prrces NOTE al modes lnclude TorordalDowersupply lntegra heaLsrnk GlassfrbrePCB pattbleVu ,neler Open and short c,rcu,t prooI SUpplied ready built and tested.OMP10O Mk ll Bi-Polar Outpur(来源：淘豆网[/p-4406294.html]) power 110watts RMS rnto 4 ohms Frequency Response 1sHz,3OKHz-3d8, THD 001%,S N R -118d8, Sens for Max output50OmV at1OK, Size 355 x 115 X 65mmPRrCE f33 99 * f3 00 P&P.ggP MF100 Mos-Fet Ourpur power I1Owatts RMS rnto 4 ohms, Frequency Response 1 Hz IOOKHz-3dB, Damprng Factor80, Slew Rate 45V/uS, T H D TyprcalO OO21o, lnput Sensrtrvrty 500mV, S N R125d8 Srze 300 \ 123 )r 60mm PRICEPRrCE f39 99 + f3 00 P&P,OMP,/MF2O0 Mos-Fet Output power 2OOwa(来源：淘豆网[/p-4406294.html])tts R M S rnto 4 ohms, Frequency Response 1Hz - 1OOKHz 3dB, Damprng Factor250, Slew Rate 50V,, uS, T H D Typrcat0 001&,,&, lnput Sensrtrvrty 5OOmV, S N R130d8, Srze 300 \ 150 X 1Oomm PRICEPBTCE f62 99 r f3 50 P&POMP,/MF3OO Mos-Fet Output power 300watts BM S rnto 4 ohms, Frequency Response 1 Hz 'lOOKHz 3dB, Darnprng Factor350, Slew Rate 60V, uS, T H D Typrcal0 0008&., lnput Sensrlrvrty 50OmV, S N B130d8, Srze 330 \'147 \ 10(来源：淘豆网[/p-4406294.html])2mm PRICEPR|CE f79 99 - f4 50 P&PNOTE MosFersaresuppledasslandardllOOKH?bandwdtt)&lnpulSensLrvrySOOmV)[requrrcdP A vers on (50KHz bandwidth & nput Sensrlrvrly /75nrv) Order Slandard or p AVu palrble wrlh our four ampltfters delarled above Avery accuraie vrsual drs,Jlay empioy ng 1 I L F D dlodes (7 g 4red) IJlus an addtt onal on olf ndrcalor Sophrstrcated log c rocircurts tor very last rrse and decay t mes Tough Inotr de(l ase w I r i nt(来源：淘豆网[/p-4406294.html])ed acry c lront S ze 84 27 45rrrrPRICE fB 50 - 50p P&PBelier lo be 'Alarmed' lhen terr f redThandar's tamous'Minder' Burgla. Alarm SystemSuperror nr cro,rave pr nc p e Supp ed as lhree unrlsconrpleie w lh rnlerconneclron cable FULLYGUAEANTEEDControl Unit Houses mrcTowave radar un I rangeup lo l5 me(res adluslable by senslvty conlroThree posrlron key operaled (ac a sw lch - oll leslarmed 30 second ex I and enlry de aylndoor al(来源：淘豆网[/p-4406294.html])arm E eclron c swept ireq siren104d8 oulpulOutdoor Alarm - E eclron c sweot reo siren 98dBouiput Hotrsed n a lanrper prool heavy duty nrelacaSeBolh lhe control un t and ouldoor alarm conta n recfarlleab e tlallerres vr'h ch provrde lu proteclrondur ng nra ns lar ure Power requrrenreni 200/260 Vo tAC 50/60H2 Expaodabe wrih door sensors pancbutlons o ele w th nstrucl onSSAVE t 138.00 usunr Pr ce 1228 8sBKE's PRICE f89.99 r f4 0o P&P) Wlry (来源：淘豆网[/p-4406294.html])buy a c.rra.t of ol se I assembly boordsIDEAL f or Workshops, Factones,Oflrces, Home,etc Supplredreadv burltOMP
LOUDSPEAKERSThe very besr rn qualrty andvalue Made spec allylosu I rodaysneed pactness wrth hrgh sound output evels F nrshecl nhard weannq blackvyn i&wr h prorecl vecorners gr leandcarryhandle Al mode s 8 olrns Fu range 45Nz 2aKHz S rc 20&l5 l2 WalL5FMS percabner Senslvrly lW lmrr dBOMP 1 2-1 00 Watts 1oodB Price f 149.99per par(来源：淘豆网[/p-4406294.html]) r,OMP 12-200Watts 102d8. Pricef 199,99pef paif. De verv Securrcor f8 OO per pa rProfessional 19& cased Mos-Fet stereoamps: Used the World over in clubs, pubs,discos etc. With twin Vu meters, twintoroidal power supplies XLR connections.MF600 Fan cooled Three models (RatingsR.M.S, into 4 ohms). lnput Sensitivrty 775mVMF200 (100 + 100)W. f '169.00 SecuricorM F400 (200 + 200)W L228 85 DeliveryMF600 (300 + 300)W. f322.00 f 10.009& STEREO R(来源：淘豆网[/p-4406294.html])ACK AMPSLOUDSPEAKERS 5& to I5& up ro 400 WATTS R M
Fixing in stock. Huge selection of McKenzieLoudspeakers available including
Plans. LargeS.A E. (28p) for free dbtailsPOWEB RANGE8',50 .S. Hi-Fi,la oz . al v u-g rolnd a ty I x ng escutcheon Fes Freq 4OHz Frcq Besp Lo6KHz PF CEfl ab e w tlr black gr e t] 1 99 P&P fl 50 ea12 1 M.S Hi-50 oz magnel 2& al y va ce co I Gro!nd dl y f x nq escutcheon Dre cas( chrssrs Wtr re cone B-o(来源：淘豆网[/p-4406294.html])sF req25Hz Freq Resp ro 4KHz Sens 95dB PRICE f28 60 t3 00 P&P eaMcKENZIE12& 85 WATT B.M.S. Cl285GP Lead guitar/keyboard/Olrco2&allyvoicecollAlly@ntredomeBesFreq45HzFreq.Besp to65KHzSens 98dBPRlCEf2999+ C3 00 P&P ea12& 85 YyATT R.M S. Cl285TC P,A/Dleo 2& ally yolce coil. Twln @ne.Res Freq 45Hz Freq Resp to 14KHz PRICE t31 49 + C3 00 P&P ea15& 150 WATT R.M S. Cl5 Baer Guitar/Dlrco.3&allyvoicecoilDie-castchassi(来源：淘豆网[/p-4406294.html])sRes Freq,lOHzFreq Besp to4KHzPRlCEfP&Pea10& 6() WATT R.M.S.1060GP Gen. Purp@e/Lead cuitar/Keyboard/Mid. P.A.2& voice coil Bes Freq 75Hz Freq Resp to 7 sKHz Sens 99dB PRICE !19 99 + !2 00 P&P10'200 WATT n.M.S. C10200GP Guitar, Keyboard, Disco.2& voice coil Res Freq 45Hz Freq Resp to TKHZ Sens 101d8 PRICE !44 76 + !3 00 P&P15& 200 WATT R.M.S. Cl5200 Hlgh Power BaaE.Res Freq 40Hz Freq Resp to sKHz Sens 10'ldB PRICE C62 41 + C4 00 P&P15'/o0 WATT R.M.S C15400 High Power Bass.Res Freq 40Hz Freq Resp to4KHz Sens 102dBPB|CECP&PWEM5& 70 WATT R.M.S, Multiple Aray Dlsco etc.l&voicecoilRes.Freq.S2HzFrcq.S2HzFreq.ResptosKHzSensSgdBPR|CE!P&Pea0& 150 WATT R.M.S. Muliiple Array Dl@ etc.1' voice coil Res Freq 48Hz Freq Besp to sKHz Sens 92dB PRICE $200 + e1 50 P&P ea10& x)0 WATT R.M.S. DiEco/Sound re+nrorement eic.1& voice coil Res Freq 35Hz Freq Besp to 4KHz Sens 92dB PRICE C36 00 + 12 @ P&P ea12& t)0 WATT R.M.S. Dieo/Sound re+nlor@menl ets.1yr& voice coil B6 Freq 35Hz Freq Resp to 4KHz Sens 94dB PRICE e47 00 + C3 00 P&P eaSOUNDLAB (Full Range Twin Cone)5 60 WATT R.M S. Hi-Fi/Multiple Array Oisco elc.l vorce co l Res Freq 63Hz Freq Resp to 2oKHz Sens 86dB PR|CE t9 99 fl 00 P&P ea61/;& 60 WATT B M S Hi'FilMultiple Array Disco elcl& vorce col Res Freq 56Hz Freq Resp to 20KHz Sens 89dB PR|CEf1099. f1 50 P&P ea8& 60 WATT R M S. Hi'FilMulriple Array Disco etc.l/i'vorcecor 8es Freq 38Hz Freq Resp to20KHz Sens 89dB PBlCEtl299 fl 50P&Pea1O& 60 WATT R M S Hi-Fi/Disco etcl%&vorcecorl Res Freq 35Hz Freq Resp tolSkHz Sens 89dB PR|CEfl649. f2OOP&PEZO ELECTRIC TWEETERS MOTOROLAnproveo irarS,iii.esoa-:. , a I :. i::--_j- a!: : :' t-:-: j.-a-a ..::::cros5olfr rs nol litJ.!a t =::_'::j_ :. ::jat : :r s' _: :j-:\:. : ::a-: :. : -.nI)Te 12 pL]I .:: :S FREE EXPLANATOHY LEAFLETS SUPPLIED \TITH EACH nlE: ::HOBBY KITS. Proven designs including glassfibre printed circuit board and high plete wrth rnstructtons.FIYI MICROTRANSMrrTER (BUG) 9o/105MHz wilh vcry sensitivemicroghone. Rsng 1m/300 mair6.57 x 46 x 14mm (9 volt)?tbo: fB 62 + 759 ?&PW .vo35?.RECEIVEF 27MH2 Rsnge up io 5O0 meir6 Ooubl @d6d modulation.Fl@iv6r ouiput oprotG ralsy w'i.h 2amp/24 voh ontaas ldeal brmsny sppli@lions Rseiver 90 x 7O x 22mm (9/'12 voh) Pf 17 82 Tr8nsmitter &) x 50 x 15mm (9/12 volt). : f 1 1 29P&P +75o e8ch S.AE pls(elin, 3 watt FMSTEREO DISCO IXERar-2 )., i. sR and th,nL y outstand5 ual fadersu rhe fo low3 Mrcs 4 L,wrth taik over swttch Head0hone MonrtorPan Pot L & R MasterOutpul conrrols Ourput 775mV Srze 360 . 280 90rnmPr;ce f1 34 99- f3 0O p&pPOSTAL CHARGES PER ORDER f t.OO minimum. OFF|C|ALOROERS E, SCHOOLS, COLLEGES, GOVERNMiNi!! . Bo-qtE9rqlcrlFlcEg tNcLUstvE oF v a,T. Car-iurvren-- VISA/ACCESS/C,O,D, ACCEPTEDBSR P295 ELECTRONIC TURNTABLEr E eclronrc sDcedcontrol45& 33 .r p m r P usM nus variable prrc r conlro r Bell dr ven a A rrrr)rf urlr pla ter wrl r stiobed r nr r Cue iever r Anlrskale (b as devrce) r Adt!sldb e counter ba anc.. iManual ailr r Srandard I & cartrrge I rrngs *S!rp red cofrplele wrth cul oul ternpiare r O COperation9l4vDC 65mAPrrce f35 99 t3 OO P&PADC 04 maq c lor aOove Pflce f4 99 ea P&P 5OpE f ITI Mrcro-firnreture VHF transminer. The smallBst kii on th merk6t' measutrn-9 an f]lncredrbre lTmm x 17mh lncludlng on'board mrc' super sens'trve fully-ble0!6rFMband,gVoprationiithrangeuptolmm&' & EIO'95 Lltr .w!oo trtrtrtr IVOL76 trtrtrtru! tcTxeoo trtrltrtrO TDSX9OO trtrtrtr Send gx4 SAE fot tull catalogue ot these and othar surveillance kits trE ;lli,'-[flifflllli6l[:#^'#'&T,11'#iitl,T,?,&' EI E EI trtrtrtr5trtrtrtrtrtrtrtrtr!trCtrUtrtrtrtrtrtrtrDDtrDtr[ IInf erak 1STNGLE PUTER &SBC.I&puter doesn't have to look like you'd expect puter to look.It doesn't have to have a keyboard and a screen and floppy disks andso on.The SBC-1 has the bare minimum of chiPs a puter can haveand still CPU chip, an EPROM chip (upto 32K), and a Pair ol 82554 UO (inputoutputi lo waggle up and down. Thereare ong included, but these are simple&74LS& or &HC& partsthat no special or custom ch ULAs, ASICSand thus there are no secre is the fastestished ol all ihe 8-bit microp possibly thechoapest too!Bare Boardel7.50(plus postage and VAT)automatic horticultural irrigation controllerBv dlsablinq the on-board Z8oA-CPU this card will plug into ourtnlerak I CPTM Plus disk-based development systems, so il youdon't lancy hand-assembling 280 machine code you don't have to!The idea is (if you are a manufacturer) you Duy l-ursl onedevelooment svstem and then turn out the choap SBC-Idevelopment system and then turn out the choapsvstems bv the hundred. lf you are really laz y we canlf you are really laz y we can writesvstems by the hundred. lf you are really laz y we can wrrthe program for you and assemble the SBC-1 cards soyou cai get on with manufacturing your product,leaving all your control problems to us.GreenbankFor more details reenbank Electronics ), 460 New Chester Road'Rock Ferry, Birkenhead L422AE. Tel: 051'645 3391.ETI NOVEMBER 1988 3NEW FROM SAGE AUDIO HrcHfEEsltPosstatE, T PENFONNATCEt'.1%![193y,THE MOST ADVANCED HI-FI AMP IN THE WORLDFollowing the ess of the original SUPERMOS we now launch a higher poweredversion with many new exclusive sound improvements not available on any otheramplirier, kit, board, module, or ready rade.FEATURES:-r Highly efficient distorlionless PURE CLASS Athroughout (low heat generation)'. Top ponents inc best Sl!!D'sr Exclusively made matched custom semiconductors. Minimal capacitor design (without DC servos)r PSU sound colouration eliminated0 Advanced PSU Jeedtomard ripple elimination includinginternally separately regulated voltage AND current toALL stages using SAGE Super'Supply circuitry. Total reactance (diificult speaker) drive capableS\ZE24Ox lOOx loommTHD O.OO01%, Slewrale 685v/us, f-3dB 0.5H2-350kHz, O/P Current 80amPs,Damping lactor 940, tEnsient power (2ohms) up lo 1800w max.PLUS ponentsfound in all other conventional amplifiersELIMINATED -1tni*e,resistors2)works3)pensation4)FixedbiasVbe muhiplier and temp gen distortions 5) Capacitor soundAND THERES MORE Sage exclusive CLEAN CLIPPING (notto be confusedwith softclipping) eliminats PStJ ripple from reaching the output even when severely clipped, this together withindividual regulated supplies to all stages (Super-supplies) T0TALLY eliminates ponent soundcolourations, (A World first!lCOMING SOON TheSAGE'ACr/vE pt MzDE' clAssA preamp,THEdefinilive match to the SUPERM0S power amplifiersAND , wecan'tp thisad,torecervea lull stze tails including fl cheque, PO orcon ptu i&fitrtl8; cr40 (p&p e2).OMNI ELECTRONICS74 Dalkeith Road. Edinburqh EHl6 sDX ' 031 667 261'1The supplier to use if you'Ie looking for* A WIDE RANGE ponents aimed at the hobbyist ** competitive VAT inclusive prices ** mail order - genelally by return of post ** fast, friendly selvice *- by mail order, telephone ordel or personal call1988 CATALOGUE NOW READY - SEND 2x18p STAMPSwe do try to keep the goods we list in stock.Whether you phone, write or call inwe'll do our best to help you.Et Open: Monday-Friday 9.00-6.00 qr:- Saturday 9.00-5.00-19& RACKCASESt Suitable for inatruments, high quality mplififfi ild may dhr apdidjons thd demsd $rengith andprclsiondlinish t NdimPtront moufr ing plab, nof ixingisolbrushed aluminium finishenhanadwfthmI Far box manutectured trcm 1 1mm seel f nishd in biek Rack mounting orfr@ es in quickassembly flatpackagaspare hfit pilels Milableordercode ffilii&t:'ri fi,&&f' Dtrbish Ede1U-l0 '19x1.75 17x1.5x10 2.4k9 23-502U-10 't9x35 17x30x10 2gkg 2x525 17xs0x10 3skg 2xl 75 17t15x12 28kg e24.5O2t)-12 19x35 17x30x12 33kg e25.503U-12 19x525 17x50x12 40kg C27.504U-12 19x7O 17x65x12 46kg S29.95Plee add fg 0O P&P forthe firsl item and Cl 50 for sach additional itemNo VAT to b added to the priceAranoeof ipmenlsavalable,sa.e rordstails.Toordersendc IOuaniity d i/ho Equireludher inbrmdion dee $nd S.A E. sorderswelT.J.A. DEVELOPMENTSDept. ETl, 19 \lUelbeck Road,Harrow, Mlddlesex HA2 ORN.bn,9887NoGeoff Bains: eai.o,^Jez Ford: Assistanr EditorPaul Chapplll Prolects EditbrJerry Fowlef: Technicat ttlustrator11 Heather Hopkinsonr DesignNooEo-6Page 35News8Read/Write9lnsight9DiaryIINext Month20Keep Regular22BacknumbersAIIIGUSPRESSGFIOUP1 Golden SquareLondon WlR 3ABTel: 01-437 0626Telex: tssNot47-7779Member of theAudit Eureauof I rs normelly publirhed on the lint Friday in rhe monrhprec.dint the &ovcr date. The ts ol rhrr p!bla&a(ionincludint.ll.ni&|e., d.srtni, phns, drawings and progrems.nd rll (op/rithr and other in(.lllcaual propedy riSh(srhcrcin b.lont to Arlu. Sp.ci.list Public.rion3 Limired. AIIrithts (onlcrr.d by rhe Lrw of Cop/rith( and orherrntclle&tu. by vrn onalcop/nthr rficelly rtu!Sp.ci.liit and tronrequire! thG p.ior wdtten &t ol pany G I 988Artus spe(i.li!( Publi&.(ions Ltd All rca3onabl (are r!raken in the pcparation of rha mrtarin. (onaanls bu! rhepublishcE c.nnot b. h.ld l.8all/ rcrponrible lor crrorsWhcrt mrrtrlcs do occur, e core&aion will normally bepublishcd rs soon ar gro.tibl..lt.il.rdi All prrces and dat:contain.d rn advc[ts rrc ptcd b/ us rn good faithaa corrc&t a! lime ol toint to paats Nei(her rh advanatrrgnor thc publirhcrs &an bc held rerponsiblc however, for rnyvrriationr aff.(tin8 p.i&a or avail.bilit, which ma/ o((urrher thG publicataon hes closcd lor prcsrO Sub*ription ntes- UK:f1800 Etrcpe:f22.20Middle East:f22.40. Far Et24 00. Rest:{22.70 orus$34.00.4lSpecial Offer52PCB Services4PCB FoilPatterns56Oops!57Classified AdsSubscriptionsETI NOVEMBER 1988Mark Warford: PhotographyJulie Capstick: na ManagerHeather Wust: Crassified saresAndrew Selwood: copy controrMark Webb: Group Editor62Open Ghanne!62Playback63Blueprint64Once Over65Photocopies66Fame &Fortune66Ad lndexltncalendarclock in our free-to-enter petitiont2Contrclfirmly under control with anexplanation ofloops, open andclosed, Bode plots and othersuch tools of the contool tradeI8The ceRay Marston launches forthwith a short series on this muchunderused breed of op-amp2tBehind BarsMalcolm Brown explains howto read those troublesomebaked bean cans with a fullexplanation of bar codes ingeneral and the July -petition in particularETI NOVEMBER 1988Published by Argus Specialist Publications Ltd., I Golden Square, London WIR 3AB.Tel: 0l-437 0626. UK newstrade distribution by SM Distribution Ltd., 6 Leigham CourcRoad, London SWl5 2PG. Tel: 0l-677 8lll. Overseas and non-newstrade sales byMagazine Sales Department, I Golden Square, London WIR 3AB. Tel 01-437 0626.Sublcriptions by
Ltd., 5 River Park Estate, Berkhamsted HP4 lHL. Tel:(1 . US subscriptions by Wise Owl Publications, 43 14 West 238th Street, Torrance,CA9O5O5 USA. Typesetting and origination by Project 3 Filmsetters, Whiatable. Printedand bound by The Chesham Press, Chesham. Covers printed by Loxley Brothers Ltd.,Sheflield.73Inspotlight on sensors and trans-ducers withthefirstof two looksat this wide field26ontinues theCircuit Theory look at op-ampsas differential amplifiersPBDJECT 29DigltalTramsistsrTesterRobert Penfold's tester checksfor the good, the bad and theleakagePHOJETT 3sruied ChargerKeith Brindley charges thebatteries other lst C/ass projectscannot reach with this simple-to-build charger for beginnersTO INTERNATIONIATPBOJECT 38B r BusterPa ell explains how touse ponents on thismonth's cover to protect yourhome and 0N)(aPBOJECT 43Pagc 43really is iaster than a speedingbullet with this ingenious panion to speed testyour pellets49e needyfromthe ever ingenious readers o{ETI8-way Stereo uitar PreshaperTouch-conholled Pre-amPCheap Touch Switchlow Current SirenSuper WooferSpechal Spectrum 128Envelope GeneratorPage 3EF@TSTTCH - sK2;1 .1&, ourPur5in April, our man with the desktop icaiculator and sharpened HB in hismouth tells us that the price of treeshas risen something shocking thisse aso nWe deeply apologise and hopethat you will consider the extua coin tobe money well spentI f fest Hr,de has introciuceci a neulfll/ -li-tin& (aie c&&J for usewith rnembrane keypad swiiches Thecase is sealed 1o standard IP65 so thatwith hermetically sealed membraneswitches the whole unit can be safelydoused with Nescaf6West Hyde has also aonouncedsignificant price reductions particularlyon Teko. Intemorm bicard500 products which are benefitingirom exchange raies and higher pro-duction quantities.Fcr iull details conract West Hyde.9-10 Park Street lndusrrial Estate.Aylesbury HP20 1ET TeL Q296)20441,.W H :.::: ;::.:,HT J : :.J:.JJ I;reasonable motorised bell which produces a 95dB ringing tone whentriggered The enclosure for the motoris fully weather protected and the belldome is fitted with anti-tamper clampscrewsThe bells are available for tworoltages: 72V al 17 60+VAT and24V atlT 90+VAT.Contact Carters. A&G SecurityElecrronics lVrigle!, Street OldhamGreater Manchester OL4 1HW Tel:tibl b33 3033pergamons iaunch of rlre CD-I ROh4 ,.ersio:r c[ the l0-volumeInternatio.'ai Encyclopaedia'ot'Educaiion inclu,les a fiee Hitachi CD-ROM drive ',rith ever5, copy. TheHjtachi drive is for iBl,[ puterc and has been left undedi-cald so ihat other CD-RONIs magaiso be reac'lThe software for the encyclo-paedia attenipts to be as simple icr usea6. posslble so that casual use inlibraries and schcois can be encour,aged. Search topics are de{ined in therdser! own worCs rarher ihati beingpicked {tom the inclexing system,Figrres and illustrations are iniludedand:all displays may be printed out,.Meanwhile Nimbus is embarkingon a series of discs aimurg tc plece iheentire World Heath Knowledge Basgonto CD-ROM First i.r'lre series is anAIDS ion and axpert sysiem,with a diagnost:: ai.l io exanrines!,mptotn: anC identify diseases thata physician shc.uld consider ireating,Further deta:ls of such treatment canther be accessedFor details of Perganron'S CD-ROM operation contact PCS, Ilead-way Hcuse 56 73 Shoe [-ane,London EC4P 4AB lel: 07&3774918 Nimbus Records 15 in WyestoneLe9's. Monmouth NF5 3SR. Tel:(new maii order service.-IaFonents. tools and eqUiprhent i5being of{ered by EES.frdm theirSourhamptor address, There is to beno minimum order and a[l normalcredit cards can be used fortelizphoneot wriilen ordersA,:aialogue is under productlonand can be obtained by ringing therrumber belowOre handy service that EES isoffering is one cff custoinised sheetrrretal working for enclosures. includ-ing hinging panel cutting and silkscreert rng[:or fu]i details and the cataloguecontact ESS, Harrison House. Harri.sdn Road, Swaythling, SouthamptonSO2 3TL 'lel: (6f t is with grcat regrel rhar we have rolonnoun.e a l0p rise in the price ofIonnoun&.& a l0p rise in the price of ,5;our favourire electronics mag. as of Ithis montirDespite our continued ess ]s[rce the neu -look ETI was launcheC:t-, a.I vast selection of literature and listsI lare up tor the price ot a stampthis monthOmnG new mail order catalogue ponenls. tools and accessories isnow available for two 18p stamps Tel:03l-667 2611 or visit the shop at 174Dalkeith Road, Edinburgh EH165DXWelwyn has produced pre-hensive guide to its SM resistors (Tel:(0670)' 822787) and Multicore haswritten a trouble-shooting wallchartidentifying the problems of SM solder-ing (Tel: ()Hitachi has published an excellent16-page guide to its CMOS andbiCMOS gate arrays and also a shortbtochure bo codec ICs.Contact Hitachi, 21 Upton Road,Watforci224422Rinal is giving awa,u a thermalmanagement slide rule to srop yourenclosure overheating (Tel: () and [nstrumex has issued thefirst update to jts Instruments forIndustry Blue Book T (Handy for Chip In. Hamlin Electronics has a 16-page catalogue of pany's ic proximitysensors Tel: (Topax has a full colour brochureof industrial mains conditioners (Tel:01-977 0055) and lastly Axion Elec-tronics has a free guide to CMOSspecial functions from Turnpike Road,Cressex Estate, High be HP123NR. Tel: (ETI NOVEMBER 1988f,ollowipecialI -last month. a Lancashire-baseciqoIllp6ny. is of{ering a coliection oflearning, and. projdct ' colleges and homeIqqnstructoi6.l ' 'E1gatrc*1.. ess Ltci ls arr. runusr.pany- It has been set up,by-'a gtoup o{ christian eiectroirics and:l riting kr generatellor a prc.lect in thaFar'Ezist.The visior i.s io run trvoschoois: one as a ice chargiriglesidqntial conrputing school, and rireother as a fiee sch,rol for th rrse ur:ableio pay, supported b-v the fees frorrr the, first'. . [i..is an amtritious project andlEleclroriics ess are hoping to.oeiretate the initlal capiial over the'ne-x_t two years,ere are {ive packages rangingthe f3U Elementary L-oarningPackage. (containing 125+ ccm-porie$ 2 bboks and 2the .plelePxkAse (with 15 books. 30()0aomponents, tst ii-tstuumelts, 20 tc,olsr.and-soldeiing fron)': .pqfull details contact ess. PO Box 10, St Annes onSda. Lancashire FY8 15AM :'f ',?&' il,:,:l;,i.', 1 ::market with 26 callboxes in L-ondon'sWaterloo station The units are cash-free wilh payment made usingMercury's own phone card, theMercurycard Unlike BTs Phonecardboxes. the kiosks can also ess, Visa, Amex and Diner's ClubcardsThe design of the bect of some criticism Mercuryinvited proposals from ten designhouses and has selected three finalkiosks to be adopted A range o{klosks provides a'sympathy with en-vironment' not availabLe with thesingle BT kiosk, says MercuryThe three deslgns are an art-rlecototem. a Gothic glass canopiedstandlng kiosk. and a dreadfulclassically columned box that isunlikely ro be sympathelrc ang wherebeyond the gates of :he BritishMuseumHowever Mercury can be prouci c{its technolog!'and pnce structureEvery- kiosk is nnected toMercurv s digital optical u'orl&- although thjs does limit newpayphone slles tc areas aireadycovered bv its work-fhepayphone unit itself, suppliedby GPI-, is sensibly laid out with simpleinstructions on LCD display and therrseiu! addiiion of a volume controlAll units will be serviced daily and areself {auit reporlingtrhe charges are also lower thanFiT callbox rates by an average of 5%iiniandl plus the major advantage ofp[ard units being 5p rather thanBT's 10p which will halve the cost ofbrief locai callsFor more details contact Mercury,90 lcng Acre. London WC2E 9NP.Tal: 01-528 2000'Tthe Digisound ModularI Synthesiser projects thatappeared in ETI back in 1980 are nowavailable in kit form againThe original modules are availablein improved form iogether with arange of nevr units includlng a key-board controller and a sounrl samplerAlso available are analogue and digitalVCOs. a profusion of filter r-noclules,processors and effects unitsFrom these can be constrircted amodest monophonic instrument or aTanDram speciai like e picturedhereThe variety ponentsmakes price listing a le:rgthy busirressbut a catalogue with kit informaticrnand price lists js available free fromDigisound, 16 Lauriston Road,Lrndon SW19 4TQ Tel: 01-9.160467fhe Young Elecuonic Desrgnerl, Awards sponsored by Texaslnstruments and Citkit have grownover the years into quite a majorevent,This year! awards ce(emony washeld in a plush london conferencecentre with 'personalities' inattendance and Education andScience Minister h Bakerhanding out the prizes of cash. cert-ificates. trophies and TI calculaiors tothe winners in the three age groupsIn the under 15 age group thewinner rvas Nicolas Adams {14) u'hohad designed an ef{ective pillowvibrator alarm to aleri deaf people thalother alarms (clocks, smoke detectors,burgJar alarms. etc) rvere sounding.The 15-19 group winneq PaulDagiey-Monis (17), also won last!ear.This year he again concentrated onthe disabied marketwith aradio llnldpanic button for exiSting alarinsysLems i-r retirement homs and sor)nHugh Mair (20) won the 19-25category with a 20MHz digitalstorageoscilloscope add-on for a PC alongwith some impr:essive soJtrirare.The cash prizes rangd ftom 850ior the runner up in the youngestcaiegory to 1500 fot the 19-25 winneralong with f600,/annum coursesponsotship, vacation gmploymentand a guaranleed job with TI aftergradr.ration.Elrofessional proiotvprnu using aFcutromised version'of a-slandardboard is the service heing olfered byMatrix Systems.The initial boarci uses the lntel8052AH BASIC together u,ith an on-board EPROM progtammer, 8K o{EPROM, 8K of sratic RAM, variousports (for VDU, printer and so on)Further hardware is then built on tothe board (pbnty oI space is avaiiabJe)either by the user ot by Matrix whoo{fer production assistance form ASICdasign through to case desiQn.As arr exampJe o{ the'ability o{such a sy*ern, d CPU card, bus cdrd,I/O card and ADC card can all bereplaced by one Matrix boarrl plusthree addiiional ICs to givr:)16-channel 8 bit data sampllng with24 wlag control iinesFor more stu{f contact MahixSysienrs, 356 SiJbury Boluevard,N'lilton Keynes MKg ZLR, Tel: (tFhurlbu is marketir d :, .\ I t'I ua.rruay Den:n o g, . ,-r'-:',r .ei?i .an lmproved version o{ the essful1503ln addition to n ormai f urcilons theunit measures frequency uo to 4MHz(7MHz with overflow rgnr:red) I'uithl00Hzresolution and 0 (-)025o'o full-S'ALE ACCUTAC\,'Resolution for normal multimeterfunctions ls 10p\{ 10mR and 1nAThp unii c an be powered from mainsor batteries ,sts f185 00 +VAT.Contact Thurlby Electronics, New7ETI NOVEMBER 1988Road, St lves, Huntingdon, Cam jbridgeshlre PE17 4BG. II I f itn relerence lo vour article onW purr,.,& physrcs rn Seprember.may I expound an alternative view?It is weli known that when anelectron meets a positron the result ismutuai annihilation with formation oftwo gamma photons, each withenergy of 0 51Me\l Conversely a pairof photons at or above this energy caninteract to form an electronT posltronpair The logical explanation is that anelectron therefore consists of a0 51MeV photon constrained into acircular path by its own relatrvistic fieldA path length equal to the wavelengthgives a circle radius of 3 863 x10 -13m with toroidal symmetryFuriher, if the photoni plane ofpolarisation rotates 36Co with onewavelength then its lLeld esconsistent with that of a icdipole (perhaps wilh a ponent) How thedioolar electrical{ield of a free es a unipolar field whenconstrained into a circular path Icannot yet explainNeutrinos are similar but have ic dipole or unipolar electricfield- my guess is that ihese areanalogous to AC rather than DC, withtheir fields constantly invertingI also propose that quarks aresirnply leptons (electrons andneutrinos) travelling at such highspeeds thar almost all their mass isrelativistic in natureHenry EarleNottinghamYes and no Yes, E:mc2 Yes, ic field can e amatter fieid and vice versa But theyare not the same thing The9 11 x 10 31kg rest mass of an elec-tron can be released as a 0 51MeVphoton but the electron is not merelya photon in disguise Photons onlytravel at the speed o{ light becausethey have zero rest mass- a phrasewhich should not be interpreted asmeaning they might have mass insome other circumstancesm: moNo matter what circular path youconstain them in, pltotons are mass-less Electrons cannot therefore bemade of ic energy andthe points about toroidal symmetryand so on do not follow. You cannotmake matter out of photons withoutchanging them into something else-in which case the other argumentsdon't really workf cannor see how the RirndomlNumbe, Display (August 1988)can work After every ten clock cycJesa single digit will be back to its originalstate with the same intervalbetweenit and the next digit A{ter ten states the'random'numbers will wrap aroundAdding tlme delag,s before a digit islatched simply alters the intervalsbetween the digitsThe only way for the circuit to workis as a single counter from 000 to 999stopped at random (or with a delay)by the mitteeA ThorneWest Morrs. DorsetYou have assumed tltat all threecounters are locked in phase Inpractice even if the oscillators were thesame frequency they vtould drift inphase sr: that binations of000-999 could be obtainedf have ju bv MakoimIWrt*, iouo&ff inyour Sepiember issue and cannot.leihis remarks pa-ss without c'omi:nent.Speaker kits are bnly to _be. fouhdin obscure electror-rics dedlers.andthrough obscuie mail ordet firmsl Weare in our 30th year and with a f 1Mturnover are hardly obscureI have sent you a copy o{ our DIYspeaker catalogue which may help tobnng Mr llalmsley up to date Our'Total'kits include s in flatback{orm These are accuratelg machineci.{r-om lSmm MDF w,ith batfle aper-tures, rebates, etc readg'cut We cansupply iron-on veneer lor the ic finish of the cabrneis Con,struciorc otten send us photographs piated speakels- usuallgtreauiifuily done anC the finish issuperjor to all butthe very best o{ theready'mades.Edge glued 3,/+in chiptroard withoutbattens and then qovered wiih vynideYuk - tri:ak construcrion andptobably not airtight It! enough to putpotential coilstructors righi ofl theidea.Dick StephensManaging,DrectorWiimslow Audiolvlaliew o{ Maplinb speaker kits werediecieci at the 4pparertt lack afspeaker kits in the high street hiJ)dealers today. There was a tiine when ,mcsr hi-ii dealers sold speakers in kit{orm as wel! as ready mad.e. Weacrcp! tiai lVilmslow Audio has beenr: ading for 30 9'ears and are happy tohear ol ytaur ercellent turnaver,ha,-t eve r. rhe iact remains lhat to thevesr ma)onit o{ the audio-mercial speakers are still rnade o{chipboard and even without iheubiquitous battens. the cabitetwe hadin the ETI ofiice for photogtaphy wasstrong enough to surviv,e a fall downthe stairc (sorry Malcolm!) withaut ascratch As to the finish, Malcolmcouid well have purchased someveneer to tnake his speakers iook likeeveryone elses bur the vinyi coveringand wood lront trame was chosen asa tough and durablefinish which looksbolh attractive and difterent- Thenatefials chosen are tnen-sumte vrith the low price of the Maplinuritb.We appieciate the extra ease olconstrualion of your Tbtai ki.ts(ailhough the expense is cr:rres^pondingl_v grealet) and we (ot,Malcolm) would be happy to byild upa review pab o{ one o{ your rnadels inthe futuref have ofren rvorrdereC about rhe barf code rrr mv beans alrd was lookinofor-uid to th& soluiion to you, pur.iI am qujte at horne with binary, hexand ehecksunrs but afier reading yoursolution I still have no idea how tociecode my beans (l don't iven knowivhat EAN stands for). [s this the bestyour stalf writers can do?While my blood is up, there isanother ihirrg. Although an occasionaljesr is e, I find gour pu)sion to squeeze a pun intoevery other line iiresome. rying to find Mike Barwise's Broughtto Light series frorn the inCex in twoyear's time. Any edltor that allowedthat piece to be published withor.itlaser or diode in the title should betarreC, feathered and hung out to dry,head ciownwarcis, from the top ofNelson's Column on a thin piece oIsrnngI\iel MackayHastings. East SussexOK we give ln The profusion of lettersdemanding a detailed explanation o{bar code enct-vption are answered onpage 21. lt took a whale page toexplain- the origit'tal soiution simplydid n,st have enough space to go intodetail-As far the indexing, all artic.les arectoss referenced and appear underboth title and subject to avoid justthisproblem, P)ease putthatthin piece ofstring away!8INFOtsMAM@N/0rKETI NOVEMBER 1988f apan's electronics industry isGlpiesently in a period of painfulreadjustment to the outside world.The willingness oI major manu-facturers to expand and relocateproduction facilities in WesternEurope and America is not simply tofacilitate the harmonious global elec-tronics industry- as promoted in theliterature of the EIAJ (Electronics In-dustries Association of Japan).Japan's exports are suffering badlyfrom the continuing strength of theYen against the American dollar andthe move away from home pro-duction is a direct result.Tiade contracts are conductedalmost exclusively in dollars so thatproducts made with Yen capital aremore expensive on the world market.Manulacturing abroad allows panies petewith Ioreign firms on equal terms,(although this damages Japan'sbalance of payments) . Manyproducts, particularly consumerelectronic equipment, are now beingsold back to Japan by panies but are manufactured inAsia, Europe or AmericaThe advantages for othercountries are obvious - caPitalinvestme nt, employmentopportunities since most oI theworkforce will be local, not to mentiona major reduction in JaPaneseimports Japan, in ihe guise of theEIAJ, carelully takes into account munities and industries to ensuremutuaI prosperity and minimising ofany initial resentment of the Japaneseworking practices.However, the rising yen is not theonly problem facing the Japaneseeconomy. There is also the petitiveness of countries in Asiasuch as Taiwan and South Korea-the NIEs (Newly lndustrialisingEconomies).Products from Asia are not onlygaining global market ground but arebeginning to encroach on Japanthome territory. Combined withattractive prices courtesy oI the yen,Japanese imports of video equipmentIor instance rose by almost 300% lastyear, colour televisions by almost900%. While they remain as only afraction of the vast Japanese pro-duction, gains of this magnitude needlittle time to make significant inroadsThe climate that is promoting importsto Japan shows no signs of changeand the Government can do little inthe face of continuing internationaldemand for improved access toJapan's home market.In 1987 the home market for con-sumer equipment in Japan exceededthe export market for the first time.This is mainly down to the exportmarket being lost to NIEs and theellect of the strong yen, as well as ilbelng supplied by Japanese manu-fach.rers abroad. Exportreductions-particu larly to the US, now at haff their1985 levels- ledto an 11% declinein home production. The reversal inrelative importance of imports andexports marks a major change to thestructure of the industY.Home demand hasbeen boostedboth by some shong stimulativemeasures taken by the governmentand by the inhoduction of newproducts- HDTV, digitalaudio, CDvideo and DBS receivers. Thedecreasing hkelihood oI HDTV epted as a global standard willreinlorce the domestic market as themajor driving force lor consumerequipment in the next few years.In confrast, performance in thefield cf indusfial electonic equipmentshows less cause for Japanese con-cem koduction rose by just under10% last year puter Per-ipherals (US markets) and -munications doing especially well.Domesnc demand for the former isalso booming and this sector of elec-tronics seems to be relativelYbouble-free.es ponentindustry. Ahhough exports of ponents increased (ironicallyoften through use by those NIEconsumer equipment manufac-turers), the demand for each area isunsble, with the o&ceptions of PCBsand lf,Ds.There has also been a good dealof trade friction in recent Yearsregarding dumping and subsequentpricing regulations of memory chipsbetween Japan and the US. Thesemiconductor indushy suffers ftompainful cyclical supply shortages andgluts (we are at present in a DRAMmemory famine with prices more thanfour times their 1986 levels).panies lost perhaps$4 billion in the early eighties bYcontinuing production while US panies were movingtoother areas. The reward was tomassively enlarge the Japanese shareof the market and to give them whatis now estimated as a two year lead inprocessing techniquesWith memory demand nowbooming again only the JaPanesehave been able to met demand andlarge profits have resulted. TheJapanese are however well aware thatthe {uture is far Irom assured.Motorola and Siemens are re-startingmemory production and NIEs,notably South Korea, are bitingincreasing large chunks from themarket. The Iuture seems to beclouded by political issues to a fargreater extent than in the early yearsof the decade.For more information contact theEIAJ, 1 Deans Yard, Westminster,I-ondon SW1P 3NR. TeI 01-799 9811.BBC Radio Show - 30th September -9th OctoberEarls Court, london 'Spectacular extravaganza'to celebrale2T years of BBCRadlo 1, 2, 3 and 4 Exhibition, live shows, etc Contact BBC Radio ShowPO Box 100, Chatham, Kent ME5 BLJElectronic Displays 88 - October 4-6thWembley Con{erence & Exhibition Centre, London Contact Blenheim Onlineon 01-868 puter Graphics 88 - October 11-13thWembley Conference & Exhibition Centre, London Contact Blenheim Onlineon 01-868 4466Digital Signal Processing Seminar - October 13thHeathrow Penta Hotel, London Coniact ERA Technology on (Desktop Publishing Show - October 13-15thBusiness Design Centre, l-ondon Contact Database Exhibitions on 061-4568383ASIC Awareness Seminar - October 17thL-ondon One of three dates in UK section of tour anisers andsponsors LSI Logic on (Satellite Systems For munications And Navigation -October 17-19thIEE. London anised by IEE Contact IEE on 01-240 1871Internepcon - October 18-20thMetropole Exhibition Centre, Brighton. Contact Cahners Exhibitions on 01-8915051ETI NOVEMBER 1988Southern Electronics Show - October l8'20thBrighton Contact Trident lnternational Exhibitions on 1Teslmex 198E (Electronic Testlng & Measurement) - October1E-2fthBusiness Design Cenhe, london. work Events on (ASIC Awareness Seminar - October 17thCambndge One of three dates in UK section of tour anisers andsponsors LSI logic on (MIC Outlook - October 19thCentre Point Building, london Market overview seminar Contact Dataqueston 01-583 9171ASIC Awareness Seminar - October 17thManchester One of three dates in UK section of tour. anisers andsponsors LSI togic on (0344) mercial Awareness And Business Skills For Young Engineers -October 2l-23rdStrand Palace Hotel, london Contact IEE on 01-240 1871SMECTS 88 - October 24'25thSurface Mount ponents Seminar Post House Hotel, Heathrow,London ponents Technology Institute on 1INTRON (Irlsh Electronics Exhlbition) - October 26'28rhRDS Main Hall. Contact SDL Exhibitions on Dublin 01-900600lnstrumentation Wembley - October 26'27thWembley Conference Cente, London. Contact Trident lnternational Exhibitionson (ITEX 88 - November l-3rdBarbican Centre, London. Information Technology Exchange backed by DTI.Contact Cahners Exhibtions on 01-388 9871.Engineering Products And Technology - November (date to befinalised)Exhibition and Conference Centre, Doncaster Contact Trinity Exhibitions on(Electronic Information Deliuery - November E-9thTara Hotel, london. Contact Blenheim Online on 07-868 4466ISOp* & SAEfor CATALOGUE(AUTUMN 1987)*refundable with fiist orderIRS: nrilG (Ot) 567 89rO - 24 HRS.PONENT PACKSBefill those ponent drawers at afraction of the normal price and don't be caughtwithout that odd resistor or capacitor plete your project ponents sup-plied are to full spec, and are not seconds orsurplus stockPack A: 650 x 25 watt resistor 47R-10MPack 8: 60 x Badial electrolytes'1ul-'l000utPack C: 30 x Polyester capacitors a or0 01 uf-1ufPack D:35 x horizontal presets 1k-'1MPack E: 30 x lC sockets 8, 14, 16 pinPack F: 25 x Red smm LEDSPack G: 25 x Green LEDSPack H: 30 x 5mm LEDS 10 Fled.u.zs ffi ffic3.25#? ffie4.50!3.00 6} it2.00S:3310 Green, '10 Yellow 12.50El..25tvpe).ad to . doort ll, prdu. M q lny odErinrudd d.tdq ard will qod6 . Edo.i sb.Thi! kir lncludesrll cmpomnlc(+ tmsfomdto mko r sni-tiv. lR Edvswilh l6 logacwtput! (O- 1 5V) Etrich wirh Dir.Ur intrrftecircuilry (BlEy., t i!c8, ltc - dstdl. updiad)on be used to iwirch up to 16 itrm! ofeqJipment on or otf tomolaly. Tha output!mcy b lilchd lto lh lut reciv.d codel orNOW lN STOCX lhese q anl sizsslar Ends 127 r l2inswiidelveroverl2volb2mmAlnbflght' sunlighlandll 5vollsmmAonalypca B.ilish.- summer day (dull and overcast) ln brighl sun.. shrne we measured 17 volls (opsn c rcu t) and ashoncrcurcunenrolover40mA HUNoREDSOF USES IN THE CAB OA CABAVAN E GHigh quality meter withfeatures normallyfound in meters costingmuch more e gDISPLAY HOLD,MEMORY, CONTINUITY BUZZER and1OA AClDC currentranges High accuracyand automatic opera-tion 6 must ,or theprolessional or serioushobbvist Size: 1 27 x 69x 25mmAC Volts: O-2-20-2oo smvDCVolts: 0-20Om-2-20-2OO-1oOOvAc current: o 2om-2}Oma 11.2%) o-1 oA l2%lDC Current: 0-20m-2OOmA(1.2%)0-10A(1.5%)Resistance: 0-2OO-2K-20K 2OOK-2M ('l%)an^1i^&irw R&,,cr^horzro.6 ,n^hhrcmnr!ry (on during tmlmisds) by lprcifying tho deoder lC snd r 1 5V rtlbilisodsupply ir lvailsblo to power enorul circultESupply: 24OV AC or I 5-24V DC !r 'lOmA.suppliss are inconvenronl or coupld lo a ad ac d bauery andsmpl6lnvederWU could burd your*lra sellconlaind ma ns supplor low power appliances Et4 !SrockNo303145 (+1175lorp&pontotaordwhici ia .ml to rodu@ dE lrd .@drtqlkld. Th. &doo& @n b. elirn.d ro prodEbartr nngiio ,aom r T@br to an Alqbn aidmbiE ci@hry to pod@ r 6Ddo.n dba olb.rl. giving . lw .oli.rb rfld.Ths cmpar*on trrnsmitter i8 tho MK 18which opocic! frm o gV PP3 batrory lndgiver a rrngo ol up to 6ott, Two koy6o6rdaore lvibble-JilKg (4-wsy) lnd MXIO (16-wavl- d.mndino on rh. numb.r 6t dnilfr ranrs Kil uss pna* conrot@chniquBslovarythepwr na marns oad by m6ans ontrol vollags The conlrclvollage (whrch mav b dervedrom a mlentiometer lhem sbo ulodMKl0 TrunlminrMKO 4-Woy Keybord... .........,MKtO l6-W!y Keybo.rd. .........ct6.30f7.50t2.20. i6-55lobvarid kom fiom 2 toSvolls tovary rhetoad powrkomzeromaxrmum and an amp ifer s rnc odd lor smattervolaws The crcs mains rcwE.ed and canconrol up o r kW iilhs klac ts Iiled wDLIoOOK This value-for-mony 4-way chaserffi1kW pBr chennl !19.25 Applcalons include lighUng conkolleG lor slaos and theatre,DUImX _ A lowe coat uni-directional versionof the abovs Zero switching to reduceinlorferenc 110 80tempralureconrollec Thekltincldes a pilnted c rcu tboardl5allowingaudio'bat'/lighlresponse TIP r ma6 arn lil nrce8atry oompoFMr..hd fiil| i6.rEFri^^e.6d.E Lzero voltage switching, automatic level controland built-in macrophone 1kW
815.60Th. O(8OOO( i..n t-w!y sqErcd kit with brJihh opteircltr.d .qrd to ligh inFr wt*$ ffimpLG whh . p.E-progcmm.d EPROta @ulnlng EIGHTY - YES 8Ol diftddt ..quMlE{rdirg .tnd..d i!.ting .nd cfies Mim..Th. KIT Md.. ful inrtMbns .rld !S @rp@m. (Mn thc FCI sffi@l .nd rqui@ 6lysignod to ropbce a stondlrd wall switchand control up to 3O0W ot ligtting.TDAilI rdDilffi f18.00XXt Tnnmitts lq above f5.10TDIOOI Torchdmm f9.30T8t0d( Touchswhch f9.30TDE/Tf2.95lD300l( t4.7sSWTCHING No Ediornlederem problemsr 2 s KV INPUT lo OUTPUTlrcUTlON: No nsk ol&mge to puterordrilerc rc! ts4 & TERMINALS TO HEATSTNK |SOUT|ON: Srmply bo r onto3V ro 32V rNPUT VOLTAGE eeily ntedacd to TtLor cMosLGIC24V lory2{Wms LOADVOLTAGE: Enabting swiching ot|ffi..Powerlul cordless plete withtable.toplwall-mounting chargingbracket Beaches soldering temperaturein '10 seconds lncludes lamp whichlights when es withmains charging unit and 1 2V car batteryadaptor Special Offer f1 5.95mnl, r.ro rch.99 .witching LED minic lurp.od @rd to ligltr LEO md . 3OO W @ipo parchffnalAnd th. bdr $ing abolt ft i. rh6 priceon., f,31.50\. / Odgmd ro produco .\1\z high htemlty lishr Frlml, I l- rtlvuilSl.frequoncaof&-.#-$\ 1 ro 15Hz rhi! kit l.o; I V irclud$ circuhry ro rril-.^__,.1^,.-l_^ -- --991-tFrig!1!pl'.rn&l:r r0A MMIMUM CUnBENT 4 !fi m heatsrnk [nd at o240n0 u 25;;;;-ilfr,;;:H&1P.Pl* re{ryis^si46i/,'r-46V ;-& :-T5i::xK124 STROBOSCOPE KtT .... f,13.7ssnrE NE P5 *r.r{ j36 ffi reirirspr n9 e in lap plnld se cu[* i.rJtalE :am6 d ,erunThis kit contains a SingleChip Microprocessor, PCB,displays and all electronicsto produce a digital readoutof weight in Kgs or Sts andLbs ln normal useatoothedwheel (pattern provided) ismade to rotate when aweight is placed onto the scales,interrupting two inla-red beams The pro-cessor counts the number of teeth passingthe sensor (up or down, depending onwhich beam is broken.first) and shows thereading on the LED display in Sts & Lbs,Lbs or Kgms A PCB link selects the scalelor bathroom or two types of KitchenScales A linear version of the toothed650 006 Lighl dury cune6 Cutu@.Frry I2 r Zhh mF!1 SEaseo on rne tuL71 26 and a 3 /digitliquid crystal dis-play, this kit willtorm the basis of adigifal multimeteroRDER NO XKl18 ............ f.l5. SelLadjuslable aulorol c r re strpF. wtlh builr n cab ecurrer cl 956S 012 Walchmakers Scretrtuer 9l 1 0/r 4 0/2 {3 0/3 8mm!1
Srol4 SralnessStdrw*zers Starghtiosd skarght3nd padded case whrch rhe! opened240x205mm !5m650 502 R6l ant +12V dc Dirll !6 S550 500 Tlan 12VdcDnMo255S 570 Salun Ma ns Dilll t15 50Based on ZN4l4 lC, kit includesPCB, wound aerial and crystalearoiece and oonents total ruler could be made by using a wheelr the correct tooth to diameter ratioCT6o00l( ....................................... . 847.mXXI l4 Relay kit lor CT6000, includes PCB,conneclors and one relay Will accept upto 4 relavs.3Al240V c/o contacts .. 4.307ol llsAdditional relays ............ .. 11.80Designed lo con-trol 4 outputsindependentlyswitchang on andoff at presenttimes over a 7-daymake a sensitive miniature radioSize:5 5 x27 x2cmsBequires PP3 9V battery.IDEAL FOR BEGINNERS f6.60E r^r,El ,'&TOCAL AUTHORITY AND EXPORT ORDERS EGOODS BY RETURN SUE.,ECT TO AVAII.ABILITYUa &buEt fic& k+nilE to minrln mparatura to wiihinO 5'C ldodldptbtorr!phy, incubatora,wiFrEkim, nc, Mor,lo.d 3kw (24OV elT.. 'rprog(rc, Siia:7x4x2 sqrEM x a f7.AOETI NOVEMBER r988播放器加载中，请稍候...
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Electronics Today International (ETI UK edition) 1988 11 S tNcLUDE V AT * PROMPT DELIVERIES * FRIENDLYvvor d w dp repulatron lor oual l\ relrabrl ly and performance at a realtstrc pnce Four mode sava able 1o surt the needs of the prolessronal and hobby market I e, lndustry, Letsurelnstrumental and H...
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