REVIEWED 11 'SCANNERS' WORLD -NEW BEARCAT ELECTRONICS TODAY INTERNATIONAL JULY 1983 $2.35"NZ$2.75 a I TO BUILD DICK SMITH'S VZ200 PUSHING DOWN THE PRICE OF PERSONAL , COMPUTING MAGNETIC 11 orpo E SCIENTIFIC MYSTERY `POWER DOWN' MAINS APPLIANCE TIMER . GENERAL PURPOSE AUDIO AMP PROJECT flRIF'i_ . 0711:HIS INTRODUCING THE REVOLUTIONARY NEW MARANTZ COMPACT AUDIO DISC PLAYER. IGITAL AUDIO, the greatest improvement in music reproduction since the birth of stereo is now available to give you sound more pure than any you have previously heard. J THE MARANTZ CD EXPERIENCE. It's dramatic. And instant. Plug the Marantz Compact Disc Player directly into your existing system and it immediately upgrades the sound-limited only by the performance of your current equipment. You can expect astonishing channel separation. Very precise spatial imaging. Sensational dynamic range. Rich bass notes. Pure true treble. And, because the encoded music is read by non -contact laser-absolutely no background noise and no disc wear. MARANTZ FEATURES. The Marantz CD73 is gold toned. Elegant. Simple. The control panel is clean and neat, with LED signals to indicate function and track selecticrn. The highly sophisticated technology is push-button operated. The disc drawer glides with the smooth precision of electronic control. Marantz is control convenience. And technologically, Marantz uses a special integrated circuit with three functions (oversampling, a transversal filter and noise -shaping) which processes the original signal through various stages to give a dynamic range of 97dB. This amounts to a 1dB improvement over most other systems. You may never hear the difference. But Marantz cared enough to make their Compact Disc Player demonstrably closer to perfection. IS THE MARANTZ CD73 REALLY ANY DIFFERENT? David Prakel for Hi Fi Answers magazine (UK) who did hear the difference said: "I have been' surprised by the quite audible difference between different CD players and have already stated a preference for the sound of the Marantz machine in terms of its handling of 'ambience' and its sheer unfatiguing listenability. Other players I've heard in direct comparison have shown a bright veiling effect with more up -front presentation and a fatiguing quality." COMPACT Hear the CD73 for yourself. Call our local office for your dUÍ nearest Marantz Dealer or write for further information. í1:i1 DIGRAL AUDIO m r nf ® 'Tr? 1. iY- HEAR. Ido EVI'I MARANTZ (Australia) Pty. Limited Inc. in NSW, 19 Chard Rd., Brookvale. NSW 2100. Sydney (02) 9391900, Melbourne (03) 544 2011, Brisbane (07)446477, Adelaide (08) 2232699, Perth (09) 2763706, Townsville (077) 722011. advertisers features 10 The Magnetic Monopole Mystery Predicted to exist but not yet found Australian 99 Op -Amp Cookbook ETI's practical guide to these versatile ICs Government 34,35 projects and technical Ampec 36 Altronics 72,73,82,83, 68 166: Function -Pulse Generator 1 Hz to 1 MHz 92,93,98 71 1520: Wideband Amp Output amp for the function generator AED 55 78 464: General Purpose Audio Amplifier Ideal for the loudhailer 85 465: Loudhailer Make yourself heard Billco 133 90 265: 'Power Down' Mains Appliance Timer Turn off that light C&K Electronics 62 99 Op -Amp Cookbook ETI's practical guide to these versatile ICs Commodore 26,27 132 Lab Notes: Some CMOS Circuits Don't Always Work Here's why Dick Smith 138,139,140 134 Ideas for Experimenters Parking light reminder, flasher, distortion unit Daneva Control 55 144 Shoparound Where to buy kits, components, pc boards and panels for projects Electronic Agencies 57 computing today Elmeasco 97 25 Spectravideo SV 318 Personal Computer More competition Emona 62 32 VZ200 Reviewed Dick Smith's personal colour computer Ferguson 18 39 Graphics Driver for the ETI-640/685, Part 2 The real thing in graphics G.F.S. 142 49 'pfs: Graph' Reviewed Graph routine for the Apple business user Hitachi Denshi 50 52 '660 Software TV message maker/inventory, memory display utility !mark 50 56 Microbee Column Use your Microbee as an audio frequency counter Jaycar 6,7,66,67,76,77, 58 VIC-20 Column " A 1.5K game, music generator 60 88,89,135,136 ZX Column Prints text in upper and lower case, encode text or data K-Nar 45 sight & sound Magraths 61 20 Jamo CBR 1703 loudspeaker reviewed Four-way Danish speakers Marantz IFC National Panasonic .... 12,13 news SCAAEERSMCViLD-NEYBEA/K'A, REVIEWED ] Nicholas Kiwi OBC e;\TODAY Pioneer 17 8 News Digest iELECTRONICS 15 News ttr- Pre -Pak 51 Sight and Sound INTERNATIONAL 28 Printout Rose Music 155 63 Equipment News LOUDHAILER Rod Irving 4,38,46,47, DICK SMITHS 64 Component News VA 200 as.ncDO. V 48,54,84,96 Pit 141 News a Communications ccwmnwc Radio Despatch 65 142 Scanners' World MAGNETK Mans+44.eá Scientific Devices 131 contests and Software Source 29,31 special offers SME Electronics 41 Sony 19 137 Idea of the Month Contest RA.'RDDI 4 MAPS lr4 MACE Truscotts 87 $90 prize to win 05.N1A2. PwntsE AIDVAhpRRpkCt Vendale 60 Video Active 24 Stand out among the crowd - with the general ETI-465 Loudhailer! Cover design by Ali White 145 Mail Order Books 153 Mini -Mart Registered by Australia Post - 154 Dregs Publication No. NBP0407 ISSN No. 0013-5216 ETI July 1983 - 3 ALL KITS LESS 10%. OFFER ENDS JULY 31, 1983 ROD IRVING ELECTRONICS 425 High Street, Northcote 3070,. Melbourne, Victoria. Ph (03) 489 8131. Telex No. 38897 48-50 A'Beckett Street, Melbourne. Ph (03) 347 9251 N --1,11C I- kits this month P ETI 465 N Loudhailer N Now you can o e make yourself = heard at the D N ETI-464 Audio Amp Module local football ETI-1520 Wideband Amp Module match of the Every hobbyist . should build at Never mind the low cost, just look next anti- ETI-265 Power Down Mains least one! This simple project can at the specs! Bandwidth of 5 MHz nuclear rally. 7C N Appliance Timer be built in quick -smart time and (-3 dB), delivers 10 V peak -to - Simple, yet .. has a host of uses - in an in- from V effective, it Cl) Push the button to turn your ap- tercom, as a baby minder, to power peak into 50 ohms +/-15 gain, distor- uses the pliance on, this turns it off automat- a loudspeaker from your crystal supply, 20 dB 0.03% improving CRO ETI-464 amp ically some convenient time later. set. Will deliver up to four watts tion, etc. Ideal for Simple to build, low in cost. sensitivity, as a video amp, etc. module. H output. I- TV PATTERN GENERATOR BIPOLAR TRAIN CONTROLLER MIXER PREAMP $64.50 EA December 80 $34.50 TRANSFORMER r :t TV PATTERN GENERATOR 1-' C : : i ¡ J . s t'J) I- 4 Adjust your TV for a hrshclass picture with EAs crystal Y controlled TV Pattern Generator EA June 80 .. Easy construction and versatue operation, this Preamp was f WIND for coupling with the 300W "Brute" Power Amp. ETI 467 October 81 July 80 SPEED $52.50 fN lei INDICATOR AUDIO TEST UNIT FOR CASS PC BIRDIES $14.50 4110 DECKS $47.50 U) i J ,... N i TRANSISTOR ASSISTED IGNITION Granny's Birthday - PC Budics. EA November 79 Grannys got a brrthday coming up and you don't know what X to give her! Her cat ran away, her dog starved and the fish EA October 81 turned upside down. Well here's the perfect gift. A no- nonsense, no mantenance companion The PC Birdies - Cl) She'll whretle, sin° and dance for hours to this amazrno Y electronic canary EA May 81 ' D $34.50 CRYSTAL MARKER $34.50 N ETI 477 MOSFET (INC 1MHZ X) ET1157 October 81 MUSICOLOR IV $84.00 MODULE $63.50 otl 157 CRYSTAL MARKER N MUSICOLOUR IV II _ .,' {Ja #1:. .. 'i 1 / r c . -_ Add excitement to parties card nights and discos with EAs e y r .. new Musicolcr IV light show This is the latest on the famous Remember the great ETI 5000 power amp With this module line of Musicolors and et offers features such as tour channel as the hub of the ETI 5000 and a transformer you gel an N "Color Organ' plus four channel light chaser front panel amazing power output of 150W RMS t LED display, internal microphone single sensitivity control 1._ Plus Power Supply (No Trans) $49.00 plus optocoupled switching for increased safety EA Plus Transformer 839.50 be August 81 comment next month THE KUIPER OVER THE PAST few months, following a change of ownership AIRBORNE OBSERVATORY and a traumatic move of the complete office and laboratory to a IN AUSTRALIA new location, publication of the magazine has got a little 'off the Editor you like your regular 'hit' of electronics/computing/ A Lockheed L-300 jet transport aircraft, rails'. If aperture telescope is Roger Harrison VK2ZTB month and haven't been able to enjoy fitted with a 36" communications/audio every operated by NASA to provide scientists it when you've come to expect it, then we apologise. However, from Editor with a very special infrared observatory. Technical we'll be on rails again with maybe just the odd David Tilbrook VK2YMI next month back the The telescope is carried to heights of loose wheel' to fix. 12 km (40 000 ft) to get it above 90% of the earth's water vapour, which absorbs Assistant Editor A serious hiccup in the distribution in New Zealand earlier this Jennifer Whyte B. App. Sc. infrared rays. This craft carried out a year has alarmed a great many loyal New Zealand readers.