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ELEKTOM Editor W. van der Horst Deputy editor: P. Holmas. Technical oditors : J. Barendrachr GH. Dam E, Krempelsauer GH, Nechbar Fr. Soheel KSM. Walraven : CSinke Mis. A, van Meyel st tm À Roger mato stcosmpcan cos dam má coonrey fe sl: 62810 count et no a ddr cn od nao Tempos fo otima to ie muco Spong Sa Bam Rua a Lido 7 7a Copy 1077 Eleitos pl Lt — Comum DEGODEIM Rania | E Y | actor ça, ay tis | EST 188 fi EPS ct Due to the rapid expansion of our mn a qo international organisation publishing Eri ap esa OE ELEKTOR magazine in English, EC GNR Dutch and German, a vacancy has me ia arcen tora ==] teduical | translator to assist the editorial section of our English edition, rent papa vrtca CURI 140 The position involves the translation | seia BsIA 140 of articles on electronic topics from | BBtmma sos am Dutch andor German into Hluent | rapngo mol dm Engl À sound knowledge of these languages is essential nd some (03 Ãão “oxperienco af elctronie Epica? terminology would be an advantage ERC The successful candidate vil be ER dm Des at our English offices im gs 070 Canterbury. Salary is negotiablo ui and ettractve conditions of De tie employment include assistance so one wih removal costs, annual holiday bonus af 8.3% and Christmas bonus of 3% Applicants should writ in tha first instance with cu. to The Manager, Elektor Publishers Ltd, 6 Stour Street, Canterbury, CrIZxZ ll o father somo ay as Ve se chat somethnespecil 5 img am invitation to investigato appen wii Ki 5 sete fo 1º he improve on and implement tp! Seal wi comam reduce a as, PARE ET Pad corespond to a period fa Negative feecback aided Bnvandlblode), ane (2) 4 she be “masi en sequence” jxchonen paca da A o enc aos ht de la at by positive... q indicate é copaspodancs 1 Me tona | The dust bios of Lie US O | Most amy sui pone amplie can log ud iteesenc level ave rsche al bi (ne picture na soon have Hen become upnerertabl Ta the St pat DI or the teria! ae: pecod O (figura a Pala en ROLO estimo nal ay reuitements Ane ppa PRE Ao, ACHE sie me” prin des from me midis se dorammite forte pumese | | ço forense fc na | CRS Vale o. One ro comme sl dr usina ato, | pablo. Tha antonio cul | pic al del Bret level. Gol ar iisuynchronizatio | opor hr Drago 9 roi | eres od ce serto Mae srt eae Pa DE GE Ueda | te derivtion! dt, resuanably due to preoscupation dae eco pa D3 fio ver | Tee dd deeies te “he Dono Re ge vi Seis periodmuny bitobemare | ear rio dinamite | Eng io perde He senti ide : its iso progot pnduced By ds | Trmesor Ae tdos per Rs 3 coma Er io descontos end end eba | | como oco de Boa es | apa R a pg rare Syremraion À sera be fd dar lhe remining bits. À modesta. e bee made te experimental, et E eine é io Inedatelo ter no Sb eis co transe he Cale subrrier úumber, which a Ti sd eos sa med Lt lo o informo not oca eomunotes it cho vico-eephone cal Am Enapl at ue armam dic System von he sairem a che ve EPE toi at ego Go a al o a unia à Pis Techncel Rene, MARTOENE RA UNER (útiyi)) This design is intended to meet the requirement for an FM tuner of outstanding performance that is easy for the home construtor to build and align. For optimum stability of tuning the circuit employs permeability tuning instead of the more popular but somewhat capricious varicap. Use of a variometer also reduces the number of “home-brew' coils. The first part of the article covers the design of the front-end and a simple i.f. strip and demodulator suitable for mono reception. A more advanced double- conversion i.f. strip suitable for stereo reception, and the stereo decoder are described in part two. Introducing the Variometer renas o it ra mecanica co Eu saga e ee simétia tj electrical more table Au à few words ot explico il Ane citer Me copasitance or (né am a variable capacitor, ané ee “atly mote predictabie and stable Et E dl 6 Km etiremey gt O factor, ade alo good eeeeimey ei only to LE tuncd cut de et of a lua si à Vasometer RR a pi Front End! A grcar deal o Encuphe as gica to ahi de feoneCnt, seusiio, ste pes ama cone 6 pol vt Gli tras io eae o Menalgpa Bla gde ct because OE chi ger gui, aqu, over ole anime meto igor 1 e irei of he out ema, ih compriss the sections: nt france je not ro tune ut ha à Pompeia encompases the FU band (Band 1). Take reli io à lhe gher susespuibity to eras Ê k Ê completed. DI ané DJ protect TL plexo ipa aco a C6 amé LA, C8, 09) between TI and TZ Local Oscillator The cosilator seat arcund T3 is a To roi puling of ME cuia fo. queer He incoming TE sinal e Tuta by emiltr ing fe o he pe o e dramistor T2, topetãor did Che E al Pro CI Jmdetion of Ene esllatos tal int she heterodyrine at much Jover oscilstor tha anal de posible lh iejestor or wi PEL air Mixar stage “The risos stage multi toocho: the e sodio sa ncia som ama diferenço rcquenda Sis ais the 109 Nite dire dEquenes ot not he anvant e” More out The msonaar clrut 16 Torne 107 Mi sele. 107 Me leis ma dc e provided im tre Tocêedine LE ampler alas desired Supply docoupling To vei inerte tatuce ch end a clher pato nº e tumer the. Soon d decoupled by LT and 36 TE" prevem imersa be Algo setas of the Muntend via te Supply lines sao raio os supply AE lt, Th nt ole ba no O he amplo re fansted “to. provide sena irenelh catia and” am output to a varie eve maine Sig, The oulput of me ll Umtivs ampltie is fed doa PULO Or and. hence a 1 Pia Er do dio stereo decoder Thus circuit dl be disco da more detail la the cont par vi Ie alle. The simple L£ ai mom ie guto 3 smp dos 4 LL desmodulror oper ad e 107 Mt. Ao open siga pena dncloator mar he added. This Gn de usa for receptiom ondy do Lino Toc dt. auplíir ma desodulaor cá te WI Uivenal OTA PII uns a are ama lhe alle “PEL Systems in Eleketor 3, Apr 1975. The adeançea Ff ateip alio mokes ais of GASTA PIT, ih minor modificam, o conde may str dy building the Emple cxcade dad estro à laer 1 50 ã “sa visa é LL for 14 demodolavioo lh signao-aoes ro o fe demoda lat sera proporcional co he mia dl feanenor dei fcquency. À ig E, Eioquener coment means. desoapled by R$, RI3, R19, 16, 24 Complete Tunor Design The variometer Moncend may, or rs, De ed im cunjuncdon WE ars Jar. To era ali ata. Bot Joca fi demo dlaor, Pa the moro ancora ate dne-onvensor jo a Dersr sl le nuio ato aero e le side verso demodulate at To7 Ns. od digrame of doll s é ES gre lhe IE iremaney dove to LE to (Not, over, tt aero teamo Poll ana no receiver mico, Tão ep PL demodulacor des ata on Jor mono reteplin. “The cc of Lhe Universal OTA PLL ie uh Supla bic compantor He reliecomiraa emciltor (CO) PE Y fas | NE É a Borin and 13, Piece te OTA PLA puros ie optima pericemance at Besa ja Eae 10. The stereo renion Sr be tun Wal, Hovcver, be opecac Teor a 12 V sapo do Uh alemao aceno, Aligament Sino te ont and cannot, by is, be aligasd who sophistisaied test ar e sa seven e e pe combination. This procedure com fe E To Connect tm effeiemt Bona 1 aerat MTO 8 de de pu vi e GRAU to sa a amp Uisougk he Core o Tae to 4 oca craamnon aca ug Mile ànd asi CS sau CH ne minimo vás E he transmitir aro al teceiva strmaly Úuen subetiono a ol piece of wire for she seua tê in he sig) val and 6 util do father imprensa E Tamo to a weak maia ad adjust o Cor idas na leva 1 desire im iedira Cy do lhe immer Coniê e usbá da place vi Cy Test Results variometer trontond ls OTA PLL 2 just PI and 2 to obra maximum | ato ste at ho Begiming of tr ri ie level E he OTA PLL. However, the ret of some adcitoaal measures ay ho of interest Oscilator Sta Tolo eee performed to estala são Te as Con ta indo ami 38 ME A a 200 a Spurious Responses ES DO TES Ra E Di Ga end 6 di pos) and dias he Eres ot L8 ad LÁ to oba mama noise e fem mito of tre mago ei and Io ar prt ar ires, Photo ly shows the mago de cescldator sara. Ie mpg meuld de 107 MH abuve qe ever fe E hero Rea o Ene rei Toda De sem bat HO eenanos at th pola a quem 45 SOB gia va he wine ia Te cegas io Boto Novena = fontond vil Me axilar 107 it Bolo the signal Eno cm photo 1b ant Te Hero minor sã na vi o te Gi e a nd lho ie mola Quout que dia to e a of Cart ata caio Do ssipee 1 out O 5 disualy “107 SM lo ee ga The lictienes dt ia males vos Soo to ima he 10 High Power Inverter using Gate Turn-off Thyristors Using the new RCA G 5000 M gate tum-off thyristors an efficient, high-power DC/AC inverter can easily be built. Am o lp oem. | Votre, qr e eaeiy rent by om axial means or to Teve ie rola ao tor Ts mas yo io for NÉ cui, e mol no oo fot DE Sonda, Te gor tum! Investor ofamps. FR poser gun of Ih vp Leno of ho usands. a] reg hat e e ea fr DC applications Dover uam a DO vontee sueh mà fat o Rb pos Ke 1 hos e ou sean of a laverter. he four ty ace -anted da à bldge conigurinion únd oiee lira by a tera pule sensrtor ie, GTOI amd lUS ate Jumed um toothor we, TOS imó GTS are lume ví. GO3 ana GTOS dee le, turged on lie GTOL ami Goi ne tumed oi, tores the a of ca” through che Dema o te imnsiormer. e cuens Cao 06 a tangfomer cm he chosen do VTA Tio eme at ma 4 12V Stenio such ata car lattro the about 200 W (neglesting losses us the transe! Uma = púgier supply lag ue a sevoeal 12W Balaio ia Alinad sino dh tytstrs emiehes il tod pese voltage o 00 V. Abe tanto pad value For tis 175 Vemapty x 105 1= Meio “Vs Ega e rent dava rom e sua ade TU Venda o! the AL the instant of silehover from one o di dps to he olhe: (e stored ao, dh ardor a E a “peer he dista, e Cl AS Voltage a pi and di o no more Has Vin 207 and va Should be adequa for most ias to a ro 1. Creu often Ee 2 Opus tor tac gua 3. Pra ut boa ar om to 1. Ocera ot e sto ur Ta ataplide of th cardio siga & soorondanatis equal to Me sapety voltage, wie ca De measreg with à muiméter. The amplo É che “aver can Vem he be o calibre te Y amplie “The 2 ms polos ar useful fo check th band oE tas Y ampliers and de compemsatin ut te Y atemuators. and “lo oc cabine ceciloscope Eoratiy calbatea esciloscoe, Pot 5 om lhe olfoct. of poor high adiisement “of the. compentation nes a he Y ateguator Construction A prio cieut oa anã compmons levou Jor tão calibator are gen im figo 5. Th 1 ves compact and em oxioscopes. 117, aisunea tt the necenay Bepoly voa cia be deriteá this should de no problem, the supply cam probably be deived toa one of te lo ltage supplies the csio- Bespe vier fire or va a simple ten The anole ot DI 5 simply connected To one df e Tum valcage socondris E tas csloecope msi trnstoraer “Ge ty, pos problem ima may Cp deaêr arablives rapp. Care Soa dh tao ag He múmeti E of the trator does not fel trouglt out to a gockst om le front [a | al ora e moetont elektorscope RN te Lo mede use shoe mt ala Ha in verocase Sos asd senta the pone spo Several readers have expressed a wish to build the Elektorscope into a case that takes full advantage of the oscilloscope's modular | construction. Fortunately, these requests coincided with the release of a new case/card frame system by Vero Electronics, and after São consultation with Vero it was decided that this | Mamma be ra Y ris ii e would accomodate the 7 cm CRT version of the Elektorscope. This article is intended to give u sato readers an idea of how to go about building their | juiliimii ty nica Elektorscope into the Vero case. dr been tos ei te saciets on he movhem à complte ist of the Vero poris | Motherbosrd and XY amplifior | futefior sea Ka uol pe Alone e o and ot bo ax. | Te par fala ot the ame are to ts sto at Gac comer, XY outnat smp rt Mt the e a ia mode ind Y moda cce on ops 8 ot uh > Time pan | Gogo Dou ra ot he cond | lempso ts io he Tia fo E] De tscé co hoste probe or | hericantaly. Jnsteaé e can be movated | potsaná siches, de guto at aa Intel lo te run rabbilt rum A. Malchau “Run Rabbit, Run' is a game of skill in which the object is to “shoot! a “rabbit”. Since both the rabbit and the gun are purely electronic this game is suitable for indoor use, with no danger of bullet-holes in the walls nor blood on the carpet. “The gd lago “arbusto | irao 1a te rapa front o ie Fai eo & chose peiior. | ho Baskine LED, fa mid score the. ca LED vil Ts e The oba e to “lol co pve tio mnçe mim 
