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minidrum displays À Blk EEB probe | big ben ú tv sound , A modulation systems ! a - — howto gyrate e ” de d bar dus te “*, ,.. Nriedda e pa DD pç ie a =: ty AO MI or ebruarny 1975/35p contents elektor february 1975 — 203 minidrum .. Elektor laborato: ul IO WS 9 ity . drums. In future issues new instruments and an automatic rhythm section will be described. sonantagas RO O. eo er a e e RR 215 philips sonant . o 216 ant”, elsewhere in this issue, a definition is given of a new type of “active” sound- In the a A practical realisation of the sonant-principle is to be found in the recently presented lectronic”. This article describes a few aspects of the way in which this sonant operates. 220 221 DL UM sopa qc) da Do Dn DO RR Cn po o dva no 222 Linking up more or less with the minidrum published elsewhere in this issue of Elektor, this article describes the simplest member of the electronic drum family. motional feedback .. improving readability of displays Drs dad on a Did ds pen anda cora Do Covo Pr eos tn o ADO 223 Elektor laboratories have designed a universal display which should satisfy the requirements of most enthusiasts. The display may be used with seven-segment indicators of the LED or Minitron type. ERREdiproDe ss Cen RR 227 The probe discussed in this article is suitable for testing 14: and 16-pin dual-in-line ICs under operating condi- tions. upwards. The second step is to describe a complete system, using active crossover networks, based upon the electronic loudspeaker used as a woofer. LES isso O nabo qua unico nao ne o no dB o a es onda ps co 234 For those who are dissatisfied with the quality of their television sound (and who isn't?) here is a design which enables a high-quality sound signal to be derived from a television receiver and fed into a separate amplifier and speaker system without making any connection to the T.V. set. ithreejevedibandif ta o pg 238 From time immemorial man has played games of chance. Modern technology has considerably widened the scope of games of chance so that a whole range of 'gaming machines! can be seen today. Bigibeni95i 239 Nowacays both mechanical and electronic doorbells playing complete melodies are commercially available. The Big Ben plays a striking and well-known melody. ne missinglinko sd DS CR 229 elektor “sonant” loudspeaker system 230 An earlier article explained the operating principle of the electronic loudspeaker. It was shown that this ap- proach enables a woofer in a relatively small enclosure to provide really good reproduction quality from 40 Hz cos/mos digital ic's mesitapi Ce cas so 242 Only recently has it become possible economically to replace the simple electromechanical switch by an electronic system with no moving parts — the Touch Activated Programmer (TAP). modulationisystems Ss soc cus dora o e SR 246 This article should give an insight into the various modulation systems now in use and will also explain the de- sign philosophy of a new transceiver developed by Elektor. maxiFdisplay sao o ar oi ao quais RR 251 recip-riaa ....... 252 = Ss The performance of preamplifiers for magnetic pickup cartridges is invariably not sufficiently well known. The weighting network described in this article greatly simplifies measurement of the amplitude response (RIAA or IEC curve), overdrive margin, distortion, signal-to-noise ratio and hum level. ES howito ayrate and'whyi sc e 255 The gyration principle was suggested by theoreticians over 25 years ago, although it is rarely seen in practical circuits. In this article the theoretical principles of the gyrator are discussed, and some practical circuits and applications are presented. improved */ segment display: us a sr dp ut 258 psvenedeliCiightsi us a SR aa E dA e a SR 259 — Ss Je to sodio possibly ot damago du saniering irons etc, The IC show bo the Jas component mounted on the hosrd, TE e Inpa eae um the inc som tac ao omg Lar shout 3 em em ve sergened ih e Bee à [ar one end valy) fa he sepply Common. The output leuds need noi he sersenea t they aro shovter tha Eeowe gem Bassdrum and snaredrum ayrator “he ic ram of he gts ie th bascdrum ami amarem | Sounds given im Fur 4 As de goto may be an dnfaniliar Concop! (o some ct Une int The Eorator bol bas to control do ut Mod 1 and inpul 2, mich com ig mom am fer, Only Se Em ectangaar plo. is js shaped by the fios dom BF The ovtrot the by Gg. O, and Ros The gyrator board Th ialei ea ge ie raros 1a sis a figure 5 ane the component Ly nt for le Lo versions are sho do Tigres 6a and 6h, Note the diferentes [e e re omited 1a tão” maueda Vesioa and 059 lhe space fr am ad lioal momoctle st the top Ian ore bo boards “The noise cireuits The convalonal sr ia adiion | son ant: almas been the loudapoaker. The physical problems involved in loudlspeaker design are more severe than. those occuring elsewhore in the chain — bu this is no reason for failing to face them. cr lee er Comer o ee 13 acongicl power. Ge cam o tmp version mecha (anne te power dFcquene sponsor reduce 18 nox Ie dordom 10) or one can lo conversion problem (e.g. cletrosario GE: Sel ater apps pego more andumentl: Combo 1º poser apl a agdncs oudspata) an inca comertor of cletrvalvoltap to it merit a new name. Wo supçese th name Ear a ae E Gu a di Se saRusda “Philips Sonane elsesshero in Chs suo. Toe introduction à ewediirioo “a fe is Et sound ep etnia rated a ecra Tel é pertemanca sera debe to do ale etinting about he woe soumd odction proces, ja te gh ol Ie production chair us The fig Tinks om che frequency charaetenstio, stteco Eulande, str will ama 0 AB e importe ven a londiesecantom | comesdon dt beu The reproduction imludes a pr sonar? Th de the Une nel apps e conseione aecears ho ato the ia e ugetioa can be perleined ay à roemal controlador. Optimum doe ral llerent conto recon sa avo dono tt ld sho ont Do eeiary wrich well offsor the esfocts of the Aistonine room acoustis om the e query. characeisto. A oneeonle Aautmemt vr preser contei the suco = Irene Pulance. “is je sometas de- Bemdlent om te posiione SE the so” nem to be met by om the actual reproduction level at any ven moment. However. tãe Ou Dea a e 100 for 300mV. from am FM tuner and 100 from a tape isorder e threfare necessary to mate level am lhe sarious input, Tae Hal periation circuit. Once again expor Eno Eeges Uh Me nunes ole bout: brckground — moderate — normal me reproduction = iler de be sa tha most a te front Bamel oro disipper, These Wee e past used maia Lo campeao imperichias in the recon o Play. tackequipment. The, operatioe pro. wide, The walker completos of operating avo equinment tune now beem replace by lhe ease df operation aa TV sei (onte provei adia! Di or arde meme prog philips sonant “===. is given of a new type of “active' sounchreproducer design, in which the radiated sound (pressure) level is linearly dopendent upon the electrical signal (voltege) abplied o the input. This approach differs fundamentaliy from the class “Pasive” Ioudlspeaker system design, where electrical input pomer is con- verted — with limited linearity — into reste acoustical poe. Passivo systems are either particularly poor in lowefrequeney linearity or else they are very bulky. On the other hand, active systems with good low frequency performans can be quite compact. A practical realsation of the sonant-principle is to be found in the recente hy presented rios 22RH532 “Electronic”, This article deseribes a Few aspects af the way in which this sonant aperates MU el mou ta Che pesto most londipeskers is far from ileal TS designer of 2 comilete system 1 dna Sora lu mio compromvss hetweça ze ape, flies, irectom al, disiorion. amplitude repones Rood “ponomnce ie he cin ap sito no sueste gl O cu Venting the mechanical acoustic plo les electron imans, One possible approcca ss lo make ie Df a power am Blierwilh negativo gugu impesance Compete fr some et ai Fesitance avi vo oba meti É lhe col movem Examples. af this appioal, are te “Electronic loudspesker iEloktor 5 mam) ane à comorealv-avaabe soar Tem elo "Serro Te ice Bl Li prog e that onda seguia pod with sum Fon al motiuesnsma devse, Que cam the agp, overal nogatme Ieeghaçk to the called utional resete Olson. The motim toodaek each USE ar aerssromuter was at less ton ya seo. The ficalt sc Csgn eblE ade, noi too cxpemive “= and suitalie Ci Principle gue sa BIC dis Of e come pls som ta er Tt motim à cosa speto Bee Gi ir liso appenach Beiig | Herefono cache ler than che sylemio mira and th tee: | font panel! The complete elecuane du contest to the “eletro Iond | quod” Campliicas” ici pose speaker, bis dei employs à slge | ayply) ado ibunted inside he tor sm ampl for the id an trblranges, | ca be ser 1 photograph Cigoro dn conunetion wck a pasive Oiidine | la a smal enclosure ac v6 Vu th The bes siso (35 500 9) halo by he eeiback system. Tvs subehanmel | prevent This Bane a citesr o dO cansste of a 0 at amplie the bas | âmplitude response” “Fa cond sich citcai Tor the plezoxecine | nora wa Aspen bem E Ea alta pickup, pace Eontr | 18 ande Mnoperatre mor jar ii se o sab os ee oé Ro repome sl Before examining e system a detail | À Furos alvanage SE the vs of fã Hi he interecng to se ol resulta | Back, It TRS Estetica 1 eenoçad o leia eu gu O a Gap pe e ba Results clica o londprate: vistoriar au Th, somo ot te aca te me | fo e e torta à ano So a 1 e em |) mer o ca de iendn feng SEER SO Saem | pa amo Cima À à ep on Ee ou tra | ço dd ds ú as t E ms EITA ] | ( ( RE Ga TRT SuineSacns"Oigan Symphony”: but that | grarane leve? dscused above male te le me more | Quêncioshigherthanit 85 ampltude “common e E perouasion and spnthoser. |. repamie rolotf poi fts ia poporeortinga. A gi Contar som Pe exerete by to 1038 | Th eltotronios. during momeatary sal peak, mally | The complete oi dsgram dade mldcane up lo out 3. | of he sonda dire Tgure 6 TO “The and veria] scale m fire 5 | improve lhe each dica das beca choca to cepussa dinda into seliono The musie reproduction (as. typicaliy em | caetano A ami B are the Sponic dem Coumtered ja monitoting room during | Circuit and fts feodback”sslems tre aca secordioel. The dando: coa" | mud-zane std trebie chama consio tour indicate (o Ii sao) be mai | Of secôêns É. D Bná É poves sugçis mu eve OF which the Pipe sontmt | Gosto final is contulei by gia capa dn a faiz domeste Uta: | spent cost Anggom l be ee that H matem | Te tis pas SE secos A (1421 to 823) js a attive hamdpas for wi Guto equencies of approtimolo 3S Ma ama S00 He The motion feed Pack sinal de injcted via C 506 Ti opetdas principle f mel files am far shui be) vel cnouêk Row, emindor Of section À is 4 om elis power amplie ham pera dandwidt of 5 Hz to 2 KM. and ad ato ac. meets l te require ob ixampicaçor, One or bw dig de tas mas be grata noi: — e derem ve pl 1434 a “TABS, necessary to prevent “arena age bes he raros foca BT he Gute ring (lhe abel atones Ieda Pc, th ae designed to” optinie o rapido. and plcearctr are it as à who ho appietion or power-Daigaons ir he upar stage 5, de eco B a date tectangl is ham enciodne he rveamit Atac, he Farmer (figure 7) Ths pelo devices a small cera pise, caspenõed im am openine ut the PC Bonrê by mean of nubber blocks. The voltage deiveea by the gh 1 proportional to te fores enc, ii tata (E= a) moi ms di as gay duto he Soler drops = al es must be Camfly Somtrled im size lookine ita an oxcemely ig im dans bien te rcazom fr usa at FE Instaline ts ET heide the pie up, father [nom om che ma PC board; ancids problems ih hum am neah The circo around T 433 combines the feios of melntalnina dh FET 4 he comece operating pot ama of esteios | e outgu sea for further processa amplie. To dever 2 siena stone cdi or, meia ln o mn Ê no 2 PenaieS PA aros ampli panos tiouet tas dlvidine neto (eelon Dto Give lhe lou | speakes ot setio + | Te irc of Seu 5 a Eid of retifica, Cano tho Sclmite tremer io section É do change state and so pull don ey 8 402, Th tom oa the feed e supoly idientor lamp 1.414 js range o glow dim so Tong se the Sean e dormane wi mare “on, via (726 and RT, Mie the amplie Dar Mão provides “r motta elo, a “stndoy conditioa fue the lamp! Hostver, our mos recent information inlenos that dl fear has Dezm omite Era Lhe lstest models. he Temp sites om and o ogener at ho amplie esueney. The sd cu ic me rn oe dei ca mae a it ] Terssem) improving the readability of seven-segment displays === sue format for digital display in many applications. The most common decoder-driver used with these displays. is the 7446 [or 7447] mich may be used with displays of the LED or Minitron type. m | C ro d ru m isa im this issue of Eleketor, this article describes the simplost member of he electronie drum family, to wi the microdrum. In this micro version the number of instruments has been limited to two: one high and one (very) low Bongo, Only tuo transistors are needed to make an instrument that can be connected directly to any power amplifier. Neglectine the cost, the bios chiso | osslltorsaeo detical desta. LES, ut | connected o almest any peer ampl) instrument for tl merodrum would | Sis presod, & podiv pule appesri on. | fer. The semply voltage cao Lerecon | e base of lhe crespondiny transistor. | abont 15 V and “Thesbape ot the po The dsge time, and che ão datiom at expensie Es Ioudspeaher ave. not require for rprodution. Tho resul a conbinatio af a very low ad a very dig homo. The circuit Higure 1 has lhe circle dggram or che ds delerninelby = | Used, l need not ho stablized, As the rent Conssting ul Cy Ro and Ca Íot | total curtent Consumplion de no more le bsscncilator and Rand, foi the | cam aa Sm e doparalos ds per omg scilator To contiast ta Lhe he, | fora el when fd rom toc bartnies te bongo ho pure capacitor actos | Event ns0g inceni leo: Mence the sound o a instrument | ad at For months ds Sanper Tigure 2 sho the prited circuit, and | low tas compenan arrang of the polos determine! hy lhe vales | ame, Themes dimensions (bt 7% | e at) ur à ing a sutabiocabinet Adeltions As already explained, tho sound of the cnlher value forthe capacitorsC5.C, and Cs (lorthe bao, and for Co, Cy and Co Creio). el e lee chat misodrum. The bas sounds produce | Of Cote, everybody isquie fre to ex | furihe expecimentaian ca Icad to em By mean ol de osso comprsine | perimene th other capacitor values. A | Guetta Entracars ani as his is he Jow bongo; asuadi; té | higher valo for lhe capacitor ves 2 | (ns dan corno osilato bulk around Tx repreeni the. | lnvertore, ao “Th sia at tl Hom he cet ig E hoy ce inoperatve nho LHE | Of Lhe io ramistare ma eg to he au hor tao canis! aut dn the Push utionsecheS amd re Open. | put via capacitor (Cp Cu | and reitro Às cam be seem im the deram, the | (o fio). The sound Jet of the bass | | Parei ie lo hongo) an the huh bon com de soja lo lute By experimentine Emo 1. Cote digam O! to mirodeam. | 3H te values OE Ra amd Ras Bo e Bs nd bo cms | Th ms qu vollage he misrodram a to om by apeimentog mim ip | ie about 1 VE the minina Load apo ae otRgamao. danoe js 184, ão dh combinalio cm be cSEaco scg da SySa cena pote tg a 
