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AUST'4LIA S NUMBER ONE ELECTRONICS MAGAZINE

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Mains energy monitor Dim your (. lights by remote control 1OOW/thaiiiL urself MT a S Be . ovie' }Bather -weight camera from the video giants.

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. i you'll realise that life's never been better. Because unlike many video cameras, there's no .. annoying heavy back -pack. No over-the -shoulder cables. It's light in weight and heavy on features like compact Omega tape loading system, 6x power zoom lens with Macrofocus, in -handle battery pack, through - the -lens optical viewfinder. Just one compact, light -weight unit designed for one -handed operation. So important when you've got a camera that will film for 3 hours, 40 minutes. That's 3 hours longer than any similar VHS camera And Betamovie comes in its own beautifully designed optional carry case that would make the professionals envious. f, Take a good look at the Sanyo Betamovie you won't SAN"Cl see yourself without one- but that's life. ihat 'Aft AUSTRALIA'S LARGEST SELLING ELECTRONICS MAGAZINE On the cover 1O. Currently installed in TiI mobil Sydney & Melbourne, telephone Telecom's new I ó1 I system cellular mobile telephone system has I :t i all the facilities ' . of conventional wired systems. Our story on wonder p.12 explains how it Volume 46, No. 1, January 1984 1104 by works. .. antra ',400W/chan viewed Remote control Features light dimmer 12 TELECOM'S MOBILE TELEPHONE SYSTEM How It works 18 ARTHUR McCLAY - NZ RADIO PIONEER Radio in the early days 121 EA CROSSWORD And the solution for December 134 50 & 25 YEARS AGO Marconi's comments, AM stereo 128 COMING NEXT MONTH New projects

REMOTE . Hifi, Video and Reviews DIMMER 30 A WHOLE NEW ERA IN AUDIO/VIDEO Video links with hill 38 HIFI REVIEW Perreaux 51508 stereo amplifier Short touch - 102 TEST EQUIPMENT REVIEW Leader LCR bridges _ontott Long touch_ dimming

11;\Electronic*Ausiralía Projects and Circuits 44 INFRARED REMOTE CONTROL For the Touch -lamp Dimmer 54 WATER SPRINKLER CONTROLLER Switches up to ten outputs Our compact infrared 76 ENERGY MONITOR Checks electricity consumption transmitter and receiver 90 MULTI -STANDARD MODEM Versatile direct-connect unit combination adds remote 100 DESIGNING RHYTHM GENERATORS PT.3 control to the Touch -lamp Scanning circuits and simulators 73 CIRCUIT AND dimmer described in the April DESIGN IDEAS Hex display, multiple flash trigger 1983 issue. At the touch of a single button you can turn the room lights on or off or dim Personal them to any desired level, Computers without stirring from your 124 PERSONAL COMPUTERS armchair. Construction starts IBM releases the PC Junior on p.44. Versatile multi - Columns standard modem 26 FORUM Dynamic Range - too much of a good thing? 62 THE SERVICEMAN AVTEK 0111111.71 .11150i» A fault the customer didn't know about 116 RECORD REVIEWS Classical, popular and special interest This new direct -connect AudiolVideo: modem is just the thing to get Departments you going in computer together at last 3 EDITORIAL communications. Built around With the compact disc and stereo a single dedicated IC, it 6 NEWS HIGHLIGHTS sound for VCRs, AM radio and provides both 300 and 89 LETTERS TO THE EDITOR television, 1984 could well herald 1200bps transmission to both 106 NEW PRODUCTS the advent of the integrated home Bell (United States) and CCITT 112 BOOKS AND LITERATURE entertainment centre. For a standards, auto -dialling and preview of this exciting new era in 132 INFORMATION CENTRE auto-answer functions. Build it entertainment, turn to our story on from a kit and save! See p.90. 135 MARKETPLACE page 30. 133 NOTES AND ERRATA

ELECTRONICS Australia, January, 1984 1 The Digital vs. Analog battle is over. From buys you the new champion. $110*""The new Fluke 70 Series. They combine digital and analog displays for an unbeatable two -punch combination. Now, digital users get the extra resolution of a 3200 -count LCD display. While analog users get an analog bar graph for quick visual checks of continuity, peaking, nulling and trends. o Plus unparalleled operating ease, instant autoranging, 2,000+ hour battery life and a 3 -year warranty. All in one meter. Choose from three new models. The Fluke 73, the ultimate in simplicity. The feature -packed Fluke 75. Or the deluxe Fluke 77, with its own multipurpose protective holster and unique "Touch Hold" function (patent pending) that cap- tures and holds readings, then beeps to alert you. Each is Fluke -tough to take a beating. American -made, to boot. And priced to be, quite simply, a knockout. So call or write for more information. Fluke 73 Fluke 75 Fluke 77 $110 $129 $165' Analog/digit! display Analog/digital display Analog/digital drsplay Volts. ohms, 10A. diode Volts. ohms, 108, mA, Vol s, ohms, 10A. n1A, lest diode lest diode test Autorange Audible continuity Audible continuity 0.7% basic dc accuracy Autorange/range hold 'Touch Hold" (undo 2000+ Mur bales y lile 0.5% basic do accuracy Autorange/range hold 3-yer warranty 2000+ hour battery lile 03% basic do accuracy 3-y®r warranty 2000+ hour beery life 3 -year warranty Multipurpose holster

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P.O. Box 30, Concord, P.O. Box 107, Mt. Waverley, G.P.O. Box 2360, Brisbane, Adelaide: (08) 271 1839 N.S.W. 2137 Victoria 3149 Queensland 4001. Perth: (09) 398 3362 FLUKE 1315 McDonald Street, 21.23 Anthony Drive, 243 Milton Road, Mortlake, N.S.W. Mt. Waverley, Victoria. Milton, Queensland. Telephone (02) 736 2888 Telephone (03) 233 4044 Telephone (07) 369 8688. Telex 25887 Telex 36206 Telex 44062. bard -ward SOLD & SERVICED IN AUSTRALIA BY

N.S.W. Ames Agency 6994524 George Brown 5195855, (049) 696399 Bryan Catt5224923 DGE Systems (049)691625 Davred 2671385 ELMEASCO Macelec (042) 29 1455 Radio Despatch 211 0191 Sheridan Electronics 6996912 Standard Components 896 1755 N. T. Thew & McCann (089) 84 4999 A.C.T. George Brown (062) 80 4355 VIC. Radio Parts 329 7888 Browntronics 419 3986 G.B. Telespares 328 4301 Elanco 428 4345 Ellistronics 561 5844 Stewart Electronic Comps 543 3733 Sirs Sales (052) 78 1251 OLD. L.E. Boughen 36 1277 Colourview Instruments POI. Ltd. Wholesale 275 3188 ECO Electronics 3765677 Electronic Shop (075) 32 3632 W.G. Watson (079) 271099 GEC Electrical Wholesale (079) 51 3155 Nortek (077) 79 8600 Solex (077) 72 2015 Fred Hoe 8 Sons (07) 277 4311 S.A. Trio ElectrIx 51 6718 Protronres 212 3111 Lab Service 2787488 W.A. Atkins Carlyle 321 0101 Protronics 3621044 Brookeades 2768888 Cairns Instrument Services3253144 TAS GHE Electronics (002) 34 2233 8 (003) 31 8533. * All prices are plus Sales Tax If applicable and subject to change without notice. Editorial

EDITOR Leo Simpson B. Bus. (NSWIT) Viewpoint ASSISTANT EDITOR Hifi Greg Swain, B.Sc. (lions. Sydney) dealers bad-mouthing compact disc players We all know that the market for turntables is threatened EDITORIAL CONSULTANT by the advent of compact disc players but I am amazed at Neville Williams the lengths that some dealers will go to bad-mouth the compact disc. F.I.R.E.E. (Aust.) (VK2XV) Some dealers have even had demos of the compact disc alongside their favoured turntables purporting to show "just how bad the compact disc is". TECHNICAL PROJECTS Someone's got to say it. These people are wrong and in a few cases, downright John Clarke, B.E. (Elect. NSWIT) dishonest. If a dealer starts deprecating compact disc players you must ask yourself if Peter Vernon, B.A. L.L.B. (NSW) he has given it a fair test or whether he is getting a bigger margin on turntables and Jeff Skeen cartridges. Colin Dawson In a really fair comparison between the best conventional discs played on a top PRODUCTION quality turntable (and cartridge) and the equivalent compact disc played ín Danny Hooper synchronism, and with levels matched exactly, you would be surprised at just how close the two sound. In fact, GRAPHICS depending on just when you switch between the two, it can Robert Flynn be difficult to tell which is which. Ultimately though, in such a test, the compact disc comes out the winner. SECRETARIAL It has no surface noise, better bass (provided the loudspeakers can reproduce it) Christine Cleary and cleaner sound on complex orchestral passages. It is just not possible for a fair- ADVERTISING MANAGER minded person to conclude that the compact disc is worse than the conventional Selwyn Sayers vinyl disc. Anybody who says otherwise is either cloth -eared, severely deluded or has a vested interest. CIRCULATION MANAGER Sure, there are some poor compact discs Alan Parker around and the overall selection of compact discs is still not anywhere near wide enough. There may even be a compact Editorial and Advertising Office disc player which is a "lemon" but we have yet to come across it. Eventually, we will 57 Regent St, Chippendale 2008. all have compact disc players in our homes and turntables will become as rare as Phone (02) 699 3622 Telex 25027. open -reel tape decks. Postal Address: PO Box 163, Chippendale, 2008. New Zealand Advertising Sales Manager: Sel Sayers. breaks into the world hifi .market On page 38 of this issue we review a Melbourne - 392 Little Collins St, Melbourne Perreaux stereo amplifier which is unusual in a 3000. Phone (03) 602 3033. number of aspects. First, it is the most expensive and most powerful we have ever Representative: Mark Christian. tested, by a long shot. Second, it is designed and manufactured in New Zealand and Adelaide - Charles F. Brown & Associates third, it is one of the very few hifi products from our region which has broken into Ltd, 178 Fullarton Rd, Dulwich 5065 overseas markets. It has been acclaimed by overseas magazines. And rightly so. It is a Representative: Sandy Shaw (08) 332 7711. very fine product even though the price tag is far too steep for most of us. Perth - 454 Murray Street, Perth 6000. What makes the case of Perreaux amplifiers all more is Representative: Ashley Croft (09) 321 8217. the remarkable that it is so rare an achievement. Why? On analysis, there is nothing really outstanding about the Circulation Office circuit concepts or engineering of Perreaux products. They are simply designed and Unit 3B, Sydneygate, Waterloo, 2018. very well made but they could just as easily have originated in Australia or anywhere Phone (02) 699 2388. else for that matter. Subscriptions There are a number of companies in Australia who could have designed and manufactured Subscription Dept, John Fairfax & Sons Ltd, the same products but they have never come up to the high standards GPO Box 506, Sydney 2001. achieved by Perreaux. Nor have any of these companies shown any of the marketing Enquiries: Phone (02) 699 2388. flair of Perreaux. Registered by Australia Post - Perhaps the best that can be said for Australian companies is that Perreaux has publication No. NBP0240. shown the way to penetrate overseas markets with well made products. It is a ISSN 0313-01b0 salutary lesson. Recommended and maximum price only. Leo Simpson

Information is furnished in this magazine without responsibility for its ultimate use or for any failure of equipment to operate as expected, or for any damage, loss or injury which may be sustained. Patents may apply to devices or arrangements depicted in this magazine. Material intended for publication is submitted at the sender's risk and while care will be taken, responsibility for any possible loss will not be accepted by "Electronics Australia".

Distribution: Distributed in NSW by Magazine Promotions, 57 Regent St, Chippendale, in Victoria by Magazine Promotions, 392 Little Collins Street, Melbourne; in South Australia by Magazine Promotions, 101-105 Waymouth St, Adelaide; in Western Australia by Magazine Promotions, 454 Murray Street, Perth; in Queensland by Gordon and Gotch (A'asia) Ltd; in Tasmania by Ingle Distributors, 93 Macquarie St, Hobart; in New Zealand by Gordon and Gotch (NZ) Ltd, Adelaide Rd, Wellington. ELECTRONICS Australia, January, 1984 11 STOCK! WE'RE CHOKING IN IT. WE HAVE SO MUCH STOCK AT JAYCAR/ELECTRONIC AT COST AGENCIES WE HAVE NO WHERE TO SIT! WE HAVE TO SACRIFICE MANY LINES GOT ANY OR EVEN BELOW TO MAKE WAY FOR NEW 1984 PRODUCTS. SO IF YOU HAVE MONEY LEFT AFTER CHRISTMAS, GET ON DOWN TO JAYCAR - No.1 FOR SPECIALS! MOST OF THE ITEMS SHOWN ARE 10 - 50% OFF OUR NORMAL LOW PRICES!!

r Quartz ANTASTIC Crystal Clock rct 1 . ernent JANUARY ONLY - Very compact and reliable - Self-starting one second stepping motor has strong torque - Powered by 1.5V AA battery that lasts for a year - Supplied with two sets of hands, one short and one long :14" $295 - 215 secondhnonth accuracy . - 56mm square, 15mm deep J Complete with data sheet instructions and wall hanger bracket IEC Cable Connectors Most imported equipment these days now uses IEC-320 style AC soon be o11 power inlet connectors. Indeed, the electronics mans will specifying these connectors on many of their mains -powered projects o to simplify land therefore make safer) mains wiring Jaycar now o stocks a range of ELECTRICITY AUTHORITY APPROVED mains line cords. We have them in straight entry, left and right entry with SS1oP4 and without standard 240V mains moulded plug. Each cord is a generals 2 metres long and Is rated at 7.5 amp continuous. vvPP Cat. No Description Price 52.95 P54302 LINE CORD STRAIGHT ENTRY 2M 53.95 PP2302 IEC 320 CHASSIS PLUG 53.95 WM4530 TO 2M FIG. 8 Multi meter PS4304 'LINE CORD R/HAND ENTRY . 2M 2 PIN 240V PLUG MOULDED 53.95 7.5 AMP CORD BLACK IN COLOUR 52.95 FUSE/DIODE PROTECTED) PS4305 LINE CORD L/NAND 2M - the first 5 Items are grey In colour) 4mm SOCKET PROBES, P51306 LINE CORD STRAIGHT ENTRY WITH (Note: - BANANA 54.95 - BIFURCATED SELECTOR SWITCH CONTACTSI 240V PLUG - 2M ABS IMPACT-RESISTANTCASEI - LARGEI MEASURES 901w) x 135(h) w 45(d)mm SPECIFICATIONS: DC 0 - 025 AC 0 - 10 EXTRACTORS 0- 10 0-50 cost IC inserters 250 low 0 - 50 0 - 0-250 0-1000 Up until now these have cost a fortunell 0 1000 AT 9,000 ohms/volt AT 20.000 ohms/volt Featu res: CMOS SAFE conductive plastic . RESISTANCE DC CURRENT - 0--5K 0-0.05 - Exclusive bent pin alignment guides in 0-50K 0-25 handle . 8 to 40 pins. 0500K 0-250mÁ dB: .20 to .22dB - Ground strap can be connected. BATTERY CHECK FACILITY: AA. C & D CELLS One hand operation. ACCURACY: DC 41-3% F.S. AC +1-4% F.S. - OHMS *1-3% INSERTERS BANANA PLUG PROBES AND BATTERY INCLUDED This is an unbelievable meter bargain. Normally this unit would sell Cat. No Model Description Normally NOW for around 525. Japanese made quality. TH1810 C IT820 8 - 20 pin $5.95 $4.16 Cat. OM 1005 TH 1812 CIT22 22 pin $6.50 $4.55 TH 1814 CIT2428 24 - 28 pin $6.95 $4.86 NORMALLY TH 1816 CIT3640 36 - 40 pin $8.95 $6.26 (a low price EXTRACTOR TH 1818 E T480 anyway) 95 Deceptively simple looking device. One piece metal $2.95 JANUARY THIS MONTH 'construction. 8-40 pins NOW $2.06 3 0/OFF SAVE WELL MOTOROLA CMOS DATA OVER RIBBON =1595 10% Normally $14.50 tweeter CMOS SAVE $16.95 BT151- 650R 54:1.1" -Willi NOW ONLY This is the 650 volt version (for extra safety) of the ele$9.95 entire which we use ín the popular 'Fluor- Unique regular phase design drives the C122E SCR diaphragm, unilonnly and completely in phase escent Lamp Starter' Kit as described in October r the full frequency range The perforance of anelectrostatic speaker with the ruggedness 1982 EA. Normally $1.50 each. This month only 862 pages crammed with up -torte minute infor- and ease of use of a dynamic. $0.95 eachi (Minimum 5 pieces). Makes the mation on 4000, 4400, 4500 devices A complete Cat CE2042 NORMALLY 536.50 ea product index is included along with comprehen. em Fluoro starter kit very cheap! sine data on every device (almost 200 described) (PCB's for the kit) Cat. HP8747 ONLY $1.95 As the part numbering system is standard, you can 5,000-40,000Hz use this reference for other manufacturers products 91dB sensitivity ZX7022 with the same generic numbers. This book norm SOW system power No voice coil Cat ally sells for 514.50. Cat BM 4210 18 amp 650V SCR) 4 ELECTRONICS Australia, January, 1 984 SEE PAGE 43 POL 0 502 SPRAY ON SAVE A FORTUNE! CONDUCTIVE $6 95 PLASTIC... LOW COST DIGITAL This handy 200 gram spray enables you to do all manner of things. MULTIMETER KIT You can spray sheets of Styrene foam and make them suitable for storing your MOS IC's. Far cheaper than other methods)) You can make conducting screens inside plastic boxes to shield RF. You can n.tl IA Ma.rex 5es1 t*eY roetnt re coat the back of CRT's. You can make eonásetwe parts of equip iú.: `iyr'ti:e..ieitñ it+.:wR' went cabinets to reduce static. The paint dries to a like , dna a. linar.w ee.r hard varnish wiww. 26. 0.20.0 film. Non -inflammable and Non toxic. Grab a can now. You never know when you will need me WI Ill Cat NA-1010 - $6.95 In... t~.fe avweni Onanlionlanot accuracy al rah wi M. ^ In.luO.e te 115 VOLT uirer at COMPUTER Set of test probes to FANS tun 52.95 Probe to sun Cat. WT5312 511.91 THIS ONLY 52 50 $ Evenedy 216 (red/ 95 9V Battery Cat 562370 ONLY S1.40 MONTH 05oID DP20101W Cat 527010 ONLY 515 AC yaAOE ANa CYe1ENT eAMOEa +ue..N a born rw. * SPECIFICATIONS ^. u re c. e * roman*o-e any ac c.n.s e Function I.s.d. Resolution Aoasrecy Peat.cdan NORMALLY Volts 200V 100mV 2%r5 Cr. (do.) 2V lmV 1%21 droll 500V la 500V IV 2%.5 dreal 20V 'Om,/ 1%11 Mort one minute Current 2mA loA 2%25 moat 1A/250V $14.95 200V 100mV 1%01 Mot 20mÁ {Oak 2%.5 met 500V 1V 1%21 dead 200nrA 100t,Á 4%.5 meat We have made a scoop purchase of computer grade Box Fans. Current 2mA IuA 1%21 drºlt 1A/250V They 2000.nÁ 1mA 7%5diolt measure a standard 80 x 80 x dOmm. But there's a Id.e.) 2omA 10uÁ 1%21 catch) dirt Resistance 2K I 1%_ 1 dint 260V They are only available in 115V1 200mA 100uA SAVE $2.00 3%11 drool 20K 10 1%.1 met rm.,. Great if you are making equipment 2000mA 1mA 5%11 foe export to the USA - or dirt 2000 100 I%11 strait use 2 In series) volóla.e.) IV 1mV No problem! OR 2%25 40910 500V 10 70006 1K 1%t1 ergot Cat YX-2508 OVER 10% 20V 1QnV 2%25 (Ir. one minute Pode Test IV 1mV 1%21 drys 260V runt. ONLY $14.95 AMAZING WAS $45 $ 95 Lyrebird Piano Kit REF: EA 11/81-1/82 GREAT NEW FEATURESII VALUE THIS MONTH - FREE! A stand 8111e the one illustrated but not exactly the same/. Worth around S50 but yarn at ro eat. charge SAVE... with each 73 or 88 note kit. - FREE) A soldering non fworrh aound 519). Yours 10 logo to yne vean of lalthful ttrvxa alter you Aare coin pitted your I. webrrd. (88 note only) - FREE) A 8 2000 roll of salder, you von need some to WW1° s'' bold the Lyrebird but there wolf he plenty left Orel for other ptomen. 173 6 88 pate ,eraonsl. ' ~..c4itA sow CHANNEL SOLOS .. °^..7 FREE! Quality IC sockets p,aerded rn both kra. ` .o MIXER REMEMBER!! THE LYREBIRD OUTPERFORMS READY BUILT :::: : KIT PIANOS COSTING UP TO THOUSANDS OF DOLLARS MORE. WHY , i ú PAY MORE WHEN YOUR CONSTRUCTION KNOWLEDGE CAN ti, SAVE YOU A -;,. i SAVE JANUARY FORTUNE? ONLY The stand that we provide for the piano kit is not the same as the one shown in the illustration. Ref: EA March/April 1983 This great 8 channel 'live' mixer Is perfect FREE!! for bands, churches, theatre groups, home 88 NOTE VERSION recording, disco etc. Console mount NORMALLY $589 Each Input channel accepts either micro- chassis and phone (balanced) or line (1V) levels. Power- THIS MONTH $489 ful equallsatlon foldback effects facilities are power supply SAVE provided. The left and right master channels $100!! can drive balanced or unbalanced lines with INCLUDED 5 band "graphic" equallsatlon. Separate FOR $495! foldback and "effects" are provided. 73 NOTE VERSION - NORMALLY $475 The unit can be rack mounted or housed in a NORMALLY THIS MONTH $425 console chassis (which accommodates the - SAVE $50!! power supply). Attractive wooden end - $98 EXTRA pieces finish the console to form a profes- si onal looking unit 10" ELECTRIC Quality Pioneer brand check the specs' Check the price', GUITAR SPEAKER HURRY 49nAMAZING Impedance 8 ohm Voice Coll pia. 1Ye (inch) Power Rating 60 WATT (RMS1 VALUE Resonant Frequency 80Hz Sensitivity 98 (dB MO Response BOHa 7.000Hr TWIN Total Flux 61,100 Maxwell SCREENED AUDIO Flux Density 8.300 Gauss CABLE $20°° Net Weight 1,540 girl Twin screened round audio cable (Two screened conductors PER ROLL - NOT fig. '8') Thiscable normally sells for S0.48Wnetre or 542.00/roll. SAVE $2995 500/0.. Cat WB 1504 520 00/roll OVER ADDRESS DETAILS ELECTRONICS Australia, January, 1984 5 N highlight New ICs from Fairchild Australia r_ "1W Fairchild Australia has available several Helicopter pilot new ICs of interest to circuit designers. These include: sees in the dark uA8T26A and uA8T28 3 -state bus transceivers, featuring MPU or MOS test pilot Hughes Aircraft Company' compatibility. Both feature high - is shown wearing a helmet Curt Lindt impedance PNP inputs and high-speed visor with a biocular heads -up display, operation made possible by the use of which is part of a new helicopter night Schottky transistor technology. They are vision The company developed system. identical to the NE8T26A/28 or the reduce a pilot's work load the system to MC8T26A/28; a weather, in hazy , at night, in adverse or uA759 high performance monolithic smoky conditions. In flight, a and operational amplifier. This amplifier image forward -looking infrared derived provides 325mA output current and visor so the is projected on the helmet features small signal characteristics may see the world outside his pilot better than the uA741. It is intended for cockpit. His head movements are of applications including . a wide range through a servo instantly transmitted voltage regulators, audio amplifiers, linkage to the infrared turret (under the drivers; - servo amplifiers and power .ti helicopter), which ís automatically aimed uA78G, uA79G 4 -terminal adjustable his line along of sight. voltage regulators. These are designed to deliver continuous load currents of up to 1.0A with a maximum input of 40V for Research leads to to be 18.7% efficient. The previous the positive regulator 78G and -40V for highest efficiency recorded by the the negative regulator 79G. The output high efficiency Institute was 17.1%.. voltage range is 5V to 30V for the 78G Work is continuing to improve the and -30V to -2.2V for the 79G. efficiency of the cells, and production 3708 8 -channel multiplex switch with used by solar cells processes that can be easily output enable control and 1 -of -8 Silicon solar cells produced by the commercial operators have already decoder included on -chip. The logic University of NSW have been tested in been developed, making large scale input lines are NPN bipolar compatible the United States and rated as among production possible. and can be used directly with TTL 5V the most efficient in the world. Most research into solar cells and all logic levels. The device is intended for The Joint Microelectronics Research commercial production involves the use use in A/D converters, multiplexing ín Centre at UNSW has produced the cells of silicon. Another semiconductor analog or digital data transmission and Associate Professor Martin Green material, -gallium arsenide, is more systems, and other instrumentation says that the time is ripe for an Australian efficient but is 10 to 100 times more 'signal routing applications. company to begin making them expensive. Gallium arsenide Further information is available from commercially. The cells have been photovoltaic cells are about 21% Fairchild Australia Pty Ltd, PO Box 19, tested by the Solar Energy Research efficient but Professor Green is confident Nunawading, Victoria, 3131, phone Institute in Colorado, USA, which carries that his group can match that figure with (03) 877 5444; or 619 Pacific Highway, St out the US Department of Energy's silicon cells in the near future. Leonards, NSW, 2065, phone Associate Professor Martin Green (centre) and the UNSW solar cell team. (02) 439 5911.

Sinclair releases pocket television Sinclair Research is gearing up for A S'4Q-.4? ' millions of sales of its flat screen pocket television set, finally launched after .. 1." '. ;R..`\ delays due to disputes at the Timex plant which will make the units. Although Sinclair claims to have produced the first tlat-screen TV tube, the company was narrowly beaten to the market by rival sets from Sony. But the Sinclair version, at around $136, is less than one-third the price of its Japanese 1 rivals. The flat-screen pocket television set aí, i AUSSAT opens the way to national TV o Telecom will be permitted only a minority share -holding in the Australian domestic satellite system under new plans announced by the Government last month. Private companies will also be permitted direct access to the satellite from their own ground stations, allowing them to set up their own networks for "in-house" traffic. However private companies will not be able to resell their shares of the satellite's capacity, preventing the creation of private communications networks which could compete with Telecom as a public common carrier of communications. Under the decision, Telecom will be allowed to own no more thin 25% of the shares in Aussat Pty Ltd, the company which will own the satellite. Companies and private interests will be able to build and operate their own earth stations to transmit and receive their own traffic from the satellite, rather than go through Aussat ground stations. satellite for each of the According to the announcement, four regions. The remote viewers being licensed to Sydney's three metropolitan three Sydney television networks receive and unscramble the signals. television however, wanted networks - Seven, Nine and Ten - will the 30 -watt The regional stations will thus be able be allowed to use the high-powered transponders switched into national to decide how much of the signal they to satellite transponders for national beams give each broadcaster an will re-transmit to their viewers. exclusive national signal, and The high networking and program distribution, a this fourth power transponder is decision opposed by proprietors appears to be the current Government as yet uncommitted. It cannot be of policy. regional television stations. switched to provide national coverage Aussat will now have to decide on and will be fixed a The broadcasting policy in spot beam covering is as yet not applications to lease the national beams, Western Australia. fully decided. The four 30W The WA State and the three Sydney networks are the Government seems certain to insist transponders on board the first satellite that most obvious customers. Regional it has the use of this transponder for were originally designed for direct stations however protest that this could state emergency services, School of the broadcasting to the outback and were to mean the domination of Australian TV Air and other needs. be directed into four spot beams by the three eastern networks. To coun- In November, the WA lower covering different areas of the continent. house ter this possibility, the Government passed a motion expressing concern Under a plan formulated last year, four has apparently decided that the signals over the possibility of television. joint ventures would be formed to sent via the transponders will be coded, programs from the eastern states coming provide separate programming via with only regional stations and some directly into Western Australia.

1 has a 50mm screen and measures just 14 Apart from the tube, the new set uses a x 9 x 3cm. Only two controls are single integrated circuit which was provided - an on-off/volume switch and designed by Sinclair Research in a tuner. Special low profile batteries conjunction with the Ferranti electronics provide up to 15 hours of viewing, said company. to be up to six times that of its The complex chip handles virtually all competitors. of the functions of the UHF TV set. It also Sir Clive Sinclair, founder and chairman' automatically decides whether it is of Sinclair Research Company, says that receiving a 625 or 525 line transmission "the new set, and its successors, can and adjusts accordingly. A UHF/VHF achieve for television what the transistor version is under development. radio did for wireless, and create a new Sinclair says that the miniature one -per-person product". television set has been used successfully in trains and cars, but that he personally The flat -screen television tube has the has little time to watch TV! electron gun mounted at the side and deflection circuits which bend the beam Left: Clive Sinclair with his new flat - through 90° to strike the faceplate. screen TV receiver. Engineering and Computer Science, News Highlights Geography and Surveying have been US Solar Energy Show selected by NASA to participate in the Space Shuttle radar experiment as one of From August 29 to September 1, for Australian University 44 experiments chosen from almost 200 the first time, the US renewable energy proposals worldwide. industry came together in one trade SIR -B returns data in digital form of event called RETSIE '83: Renewable in Space Shuttle imagés taken from a variety of angles, Energy 'Technologies Symposium and giving a detailed view of the topography International Exposition. Dr John Richards, experiments of the area scanned. The event, which was held at the Remote director of the Centre for Anaheim Convention Centre, California, the experiments The 17th flight of the US Space Shuttle Sensing, says that near Disneyland, was sponsored by the data similar to that in August this year will signal the start of should produce California Solar Energy Industries Fowlers Gap, major experiment involving the obtained for the Sahara. Association and the US Department of á the of NSW in the search for 100km north of Broken Hill, Commerce. University Ranges and the underground water in arid areas of Macdonnel industry is a regions have been The renewable energy Australia. Mildura/Pooncarrie new one, spurred to a for the tests. comparatively On board the Shuttle will be an selected oil crises of the mid involves interpreting great extent by the advanced radar system which can gather "The experiment industry, the heating from these regions in 70's. Of this young images of the earth's terrain and actually radar imagery hot water, space to evaluate the potential of using sector (domestic look below the surface in extremely dry order pool heating) is the to locate underground water heating, swimming regions. Called "Shuttle Imaging Radar - the data due to its relatively low assess its viability in most developed B" the system uses the movement of the courses and to zone. The technology. orbiting spacecraft to create what is in managing the State's arid provide images which Of the 231 exhibitors, 45% (103 .effect a very long antenna, achieving a latest advances the topography exhibits) were in this field, including resolution of around 25 metres on the enhance the contrast of which are familiar Australian names like Solahart ground, from an altitude of about and allow patterns to be seen imagery. The and Solar Edwards. Other exhibitors in 230km. not visible through other is reflected from this field were manufacturers of special iTe SIR -B experiment is the third pulsed radar beam areas coating materials to enhance the heat spaceborne imaging radar to be orbited, water in the earth so that in wet in arid capture of the solar collectors, various following a Seasat satellite mission in there is good reflection while the ground storage tanks and insulating materials, 1978 and a Space Shuttle flight in 1981. regions the radar penetrates and electronic controllers. The first Shuttle flight of the radar raised until it is reflected by underground interesting product in the the possibility that the system could aid water". The most the search for undergound water, The CSIRO and the Defence Research heating field was the Pulstar electronic returning high resolution images of Centre in Adelaide will also participate in controller. Unlike Australia, where In most buried watercourses in the Sahara and experiments using the radar system. therniosyphon systems are the Menindi Lake area of NSW. fact, of the 14 experimental packages popular, the American home owner The University's Centre for Remote from outside the United States aboard prefers an active system with the storage solar Sensing in association with the Schools the Shuttle, three will be from Australian tank at ground level and only the of Applied Geology, Electrical research teams. collector on the roof. This system requires a circulating pump and some for four of the five experiments are (clockwise from left) Dr Geoffrey Team leaders sort of controller, hence the term "active Dr Tony Milne, Dr John Richards and Dr Bruce Forster. Taylor, system". The simplest method is to use a mains powered circulating pump coupled to a time clock. The use of a photovoltaic module to run a DC pump seems ideal since it eliminates the

Illlhn,lllll. ItuItU1I181pIll IHlql lllll l Australian modification for the Hornet? Informed Washington sources state that Pentagon officials may accede to intense lobbying by a group of retired admirals from New York, and order immediate feasility studies into the possible introduction of an Australian designed modification to all USN and USMC Hornets. Without this device, the admirals insist, the United States will become a second- rate sea power by 1987. Dubbed the Kinetically Energised Equipment Levitator (KEEL), this revolutiónary development is said to provide dramatic improvements in Concentrating systems are economical s. for large systems like village power stations, independant power utilities or water pumping for irrigation. Wind generators were shown by 17 exhibitors, mostly showing large 30 to 150kW units. In 1978, the US government passed the PURPA act. This "Public Utilities Regulatory Policies Act" allows small renewable energy power producers to -1,100.4 connect to the mains utility grid and be i paid a reasonable rate for their excess electricity. This applies bot1i to residential and business users. "1'I% ' Since PURPA, "wind farms" have become a viable business producing electricity and selling it back to the utility l companies. In California alone, some *f' 1200 wind turbines were installed in wind farms last year. The American Wind Energy Association expects the 441 ir total installed capacity to exceed 120 MW by the end of 1983. Although PURPA also includes IL photovoltaic generators, the higher initial cost of PV makes it much less controller (pump only runs during and government bodies to publishers of viable at this stage. However, the daylight hours) and gives independence various journals etc technology to generate high power from the mains electricity supply. The Photovoltaics and related equipment levels using PV is already available. This drawback. up to now has been the cost was next with 21 exhibitors. The small was shown by ARCO Solar with a 1MW of the PV module and to a lesser extent, number in this category relative to the power station near Hesperia, Southern the cost of a DC pump. heating group indicates the difference in California. Now, Pulstar has come out with a technology levels. PV is still a high The renewable energy industry is a system which uses a much smaller PV technology product which requires a lot young but fast growing industry in the module, 7 Watt compared to the more of capital and technical expertise for USA. It currently supplies more total common 20 or 30 Watt module. During manufacturing. energy than the 72 nuclear power plants, low light intensities, the stored energy is Three companies, including the but this is still only 6.3% of the $US converted into a pulse train which drives Aerospace Co and Martin Marietta Corp, energy supply. In monetary terms, sales the stepper motor on the pump. As the displayed concentrating PV systems. of all renewable energy products and light intensity increases, so does the Typically, sunlight is magnified 100x equipment in 1983 will surpass $US5 pulse frequency, thereby creating a using plastic fresnel lenses and billion. good match between available solar concentrated on 3 x 3cm solar cells. Australia will also see a growth of this energy and water flow. Some systems have passive cooling young industry and benefit from the The next biggest group of exhibitors while others are water cooled. technological advances made in the (34) were organisations and societies. Microcomputers are used to control the USA. (Report by Jim Kuswadi, Amtex These ranged from trade organisations two -axis tracking. Electronics).

performance _ throughout the whole flight envelope. In particular it increases These sketches show how maximum speed down wind and vastly the proposed modification improves turn radius and acceleration in would be added to the a dog-fight situation. Hornet. The inventors of the system, Lexcen Aviation Pty Ltd, are jubilant over this Washington development as it promises enormous earning potential under current AIP offset programs. McDonnell Douglas engineers are meanwhile working around the clock in order to perfect a complementary modification, the Somewhat Taller and Improved Landing and Take -off System (STILTS), without which the full potential of KEEL might not be achieved. [From "Hornet Report," courtesy McDonnell Douglas (Australia) Pty Ltd].

ELECTRONICS Australia, January, 1984 9 sr vTOiP1r, YOA'il. 500MHz Digital Period/Frequency Counter

Superb design uses the latest IC tech- 11.ROh...LNICY, PERIOD colrNTrR nology. The low component count makes ,v-1323,1'8 it very reliable and easy to build. It will INCLUDING measure frequency to 500MHz (with EXCLUSIVE optional pre see left) and `O CASE = -scaler- period MpUWE`I both with a 7 digit resolution. It rivals the performance of commercial units costing many times the price) Cat K-3439

Pre FOR ABOVE Huge, bright high efficiency, 7 segment Scaler display. Improve the performance and increase the range 3 frequency ranges, 0-10MHz. 0-50MHz. of your K-3439 Frequency Counter to a more 10-500MHz (with optional pre -scaler). professional range of operation... 10 - 500MHz. 4 gating times, .01, .1, 10 seconds. This kit adapts easily to the existing 4 period measuring ranges, 1, 10, 100 and frequency counter PC board. 1,000 input cycles to give a 0.1 us resolution. Cat K-3432 High input sensitivity, 10mV to 30MHz, 10mV to 50MHz @ 1M input impedance. $31 QUALITY SEE EA DEC. 1981 FOR ONLY $115 is amnia."' FUNCTION Function Generator An essential piece of test and design gear fbr all hobbyists, amateurs, service technicians, engineers, etc. Produces sine, triangle and square waves from Don't miss out on these below 20Hz to 170kHz with a very wide range of output Jevels too. Case shown is included. Cat K-3520 SEE EA DEC. 1982

SUPER SIREN HOLIDAY PROJECTS A great TO SINK YOUR TEETH INTO Instructions for all kits are written by professionals, in easy to under- little screamer! stand language. Kits are laboratory tested to This siren has got an ear-splitting sound, yet it 1s compact and draws This unit has 4 Inputs prove that they actually work and very little cunent It uses a piezo-electric tweeter, which can be with an impedance of all components are thoroughly 8_ 9 soldered directly to the PC board. Ideal as an equipment malfunction 100K- suitable for most checked by our Quality Control alarm, intruder alarm or car alarm (separately powered and not mlcs. guitars, etc. Ideal for use with power amp Department. 1 dependent on the car battery). We are proud of our kits. We Cat K-3505 modules up to 300W. have built our reputation based on SEE EA AMAZING VALUE Provides bass, treble and their quality and back every kit we NOV. 1982 $1 995 presence control. sell with our exclusive 7 day Cat K-3035 VALUE satisfaction guarantee. SEE ETI $2950 Video JULY. 1980 That's the 50W Amp Module . DICK SMITH GUARANTEE e-- Enhancer Ideal for home stereo systems. The compact design -0. makes this module the obvious choice wherever a VCR's are all the rage. But the quality can be general purpose amp Is required. help medium power pretty crook A video enhancer can con- Input sensitivity is 500mV siderably. Build this one and find out - and it Cat K-3440 won't break the bank! Don't forget the patch SEE ETI ONLY $1995 over your eye ... Cat K-3463 DEC. 1976 IMPROVED 100W Amp Module $3595 100W RMS: 5kHz - 5 signalnoise QUALITY ratio. The ultimate in simplicity; even the power transistors mount on the one PCB. Ideal for the home See EA FOR ONLY constructor or technician who wants to 'roll his own' OCTOBER 198.1 amplifier system for the home or professional use. Cat K-3442 SEE ETI DEC. 1976 00 Fluoro Starter ETI PS This substitute electronic starter solves the 480 problem of lights going blink, blink, blinkety Power blink and gives you a smooth rapid start Supply EVERY time you switch on. And all the parts Full PCB and component kit for one K-3442 or two are housed in a standard starter K- 3440 modules (above). Supplied complete with case! Outlasts conventional speaker de -thump relay and Zener regulated plus starters by far! and minus 15V preamp rails. Cat K-3082 50 SEE K-3ETI ONLY SEE ETI $ 95 See EA OCTOBER 1982 DEC. 1976 VALUE , x a

x a

ea ..r,.:..:u,., TV SERVICEMEN YOUR OWN CASINO! BUILD -IT -YOURSELF BARGAIN! The D14Je Smith A GAME OF SKILL! TV Electronic Pattern Roulettgx Leds & Generator Wheel Ladders A game of skill which is A bargain for the serviceman, technician, not only a lot of fun to play, but which also gives hobbyist etc. We had one of these 5 years you a chance to improve your reflexes. VALUE AT ago and sold thousands! Now here's a Gs brand Can you climb out of the well without new kit giving M "y ^ ONLY crosshatch, and raster for being - dot CtVSI`1E H dumped back in? Easy to con fast and simple convergence, etc. struct the kit comes with all parts SEE EA NOV. 1983 V01:41(591" required and full instructions. Also Cat K-3472 Wowi All the fun and AMAZING $i 650 included is a specially printed foil excitment of Las Vegas .. . VALUE AT label for the box. Cat K-3390 tS OR ONLY Wrest Point... even Forbes Street. SEE EA AUG. 1980 EXC Now you can have a completely VIDEO M°11 $2995 random roulette wheel - without INC MOp the bias of some commercial units. $2950 Alien Cot K-3389 SEE EA MAY. 1983 Invaders The not so random Wow, You could save the earth from those pesky aliens and on a kit you Breath Tester built yourself! Multi -level Beware boys in blue and booze buses LED display, easy to build bailing belligerent Brabhams blowing and battery operated, Fan- bad breath into bags before banning tastic for Christmas gifts ON LY 1 for technically inclined kids. Check out our breath tester kit - it w SEE ET! ;at K-3393 could the answer to your ee y 5. AUG. 1983 Cat K--33 391 See EA 9 May 1983 ONLY MORSE PRACTICE Electronic ITS AMAZING Door Chime An exclusive design, this unit plays Stereo a different tune every time you press the front door button. Perhaps you like one tune in particular, this Simulator Wish those old video movies had is also possible. Everything you modem stereo sound? This low-cost need is supplied in this great kit. gadget turns almost any mono signal into amazingly Thinking of becoming an amateur radio operator? If you are. Cat K-3502 yoirll need to be able to send and receive perfect Morse at good synthetic stereo! speed of 5 words per minute for 10 words for a'fulr licence) Easy to build, tool before you can pass the amateur operator's licence examina- \T W11 FR ONLY Cat K-3421 tion. This Morse Practice Set will help you learn the code. and yOUR $31 See EA April 1983 achieve the speeds necessary. SEE EA SEPT. 1979 PRE Cet K-2623 AOCP EMFUSXA ONLY $450 BUILD YOUR OWN THE SEE NWAY 2 BOOK Phoney Musicolour Mk IV Qt ENDE The latest model Musicolour combines all the features of Musicolour Ill and Light Chaser, plus thisgreat little kit Patch uNWith SEE ETI MAY. 1983 much more. Chaser plus 4 chase patterns, plus you can sound like a Phone patching is legal from a Darth Vader, November automatic and reverse modes for startling effects. Dalek, 1st Build your own ONLY a Cylon, or any one of phone patch and Cat K-3143 SEE EA AUG. 1981 aoffds! ozen robotic spin save a fortune ... very simple kit, suits ti3 pin most transceivers Compare our price with built-up I FEB.'82 WAS $29.50 units.59$5950 117: Cat K-3054 Not Telecom e ET9 Permitted QtFüitIIV e C rfOR YIJUR cAR!)\ 150W Mosfet PA/ Co13 e) FA e IMPROVED! Guitar Amplifier Guitar and public address ampHler utilising ET I's 499 Mosfet 150 watt power amplifier module as published in Car Alarm ETI March, 1982. Comes complete with pre-amp PCB and SeeE981TI special Hitachi mosfets 2 SJ49 and 2SK134. - JULY 1 k 2 Cat K-3525 The Car Alarm Mk 2 uses a different trigger- ) ing technique - one that makes it less prone to false triggering! It will detect a $119 current flow ANYWHERE 'in the vehicle's SEE ETI MARCH/ electrical system. d JUNE. 1982 Cat K-3253 5 0 WAS $28.50 P r x Transistor h 0 Assisted Ignition f Ideal for use in all con- 1>.-<' enlional ignition systems. this revised unit adds to stab- flity and gives higher energy Housed Ina die-cast boa with deluxe $ ata radial fin heatsink for best possible performance. Cat K-3301 w--- SEE EA FEB. 1983 See 96 for fun odkle... e 's has all approach to the problem. First, they Telecom's new cellular mobile telephone system moved from the VHF band, typically the facilities 'of conventional wired telephones. Here's a around 160MHz, to the UHF band and as high as 900MHz in some cases. look at how this advanced system works. This had the advantage of making many more channels available - Telephone engineers have long sought to the radio system. It was, at best, a typically 100 or more - and of allowing to extend their conventional wired time consuming arrangement. two separate frequencies for each telephone network into the mobile field; But the real 'snag was congestion. Since channel, one for the out -going signal to cars, boats, aircraft, and even all subscribers had to share one or two (base to mobile) and one for the lightweight pedestrian sets. Many channels, there were many occasions incoming signal (mobile to base). This approaches have been tried over the last when a subscriber had to wait for long permits normal duplex operation and 30 years, but it is only recently that a periods before a channel became does away with the press -to -talk system giving all the facilities of a wired available. A further restriction was' that, requirement. were used, any telephone has become a reality. even if several channels Limited coverage In the past, mobile telephone systems individual vehicle could use only the one have employed one or two VHF channel for which it was programmed. On the negative side UHF has the channels on a simplex (press-to -talk) While that channel was occupied, all disadvantage of limited coverage, basis. Calls originating from a telephone other vehicles allocated to it could not particularly in rugged terrain or heavily had to be manually connected to the use the system even though other .built-up areas where tall buildings cast radio base and an appropriate selective channels might be clear. sharp RF shadows. To overcome this, the calling code initiated to alert the mobile Because of these limitations, it was system uses multiple base stations, each subscriber. The call would then proceed necessary to severely limit the number one designed to cover a part of the total in a more or less normal manner, except of subscribers. As a result, there was service area. These are called "cells" and that the mobile subscriber had to always a waiting list and what amounted the common term for this approach is operate on a press -to -talk basis. to almost a black market in mobile "cellular system". When a call was initiated from a telephones. This system no longer restricts the vehicle, it was answered by an operator Then, a few years ago, overseas vehicle to a single channel. It is capable who noted the wanted number, dialled engineers, mainly in the United States, of using any one of (say) 100 channels, it, and then patched the circuit through adopted a completely different the first vacant channel being selected

in memory. Below is the handset and cradle, above right the key pad, and below right the handset with space to list numbers

i e es by PHILIP WATSON automatically. Thus, a subscriber might requiring trunk or overseas circuits, with be allocated -. channel 10 in a slack no more effort or delay than using a period, or . u channel 90 in a busy period. normal phone. Finally, they added a dialling system That, in very general terms, is how which allows the mobile phone to work these systems work. But the various directly into the telephone network and firms who have pioneered them differ in call any number, including those their approach to various problems, so that individual systems vary considerably in detail. The system used by Telecom Australia was designed by the Nippon Electric Company of Japan (NEC) but is made in Australia by NEC Australia Pty Ltd. The Telecom system as currently. installed in Sydney and Melbourne operates in the 500MHz UHF band. Each channel uses two frequencies, 10MHz I 3 apart, to provide full duplex operation. ! These systems initially employed 47 { channels and were designed to accommodate 2000 subscribers, with and Telecom is planning to install two the capability of upgrading to 120 more bases, one on the Channel 7/10 channels and 4000 plus subscribers. tower in the Artarmon area and one at They are currently being upgraded to 96 the telephone exchange at Hurstville. channels. Melbourne is more fortunate in this In the Sydney area'there are currently regard in that it is flatter and has a nearby five base stations: at Telecom House in mountain range. It has three bases: one the city, Waverley, Dural, Bilgola at the Lonsdale exchange, one at Dunns Plateau, and Cecil Park. Unfortunately, Hill;and one on Mt St Leonard. due to Sydney's rugged terrain, there are The system is also available for boats !RC still some spots which present difficulties and, in Sydney, the coverage is from

ow 4

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: : 1 : w :

.0 tN VII V uy 411, 1+ Jfg +r lr Telecom's mobile telephone system - LM `I``s`,

r 3

satisfied customer. Stephen Hatcher, plumber, of Shauna Wilson uses the mobile telephone to book a customer Another is the 1000th mobile telephone customer in NSW. for. her Hansom cab in Sydney's Rocks area. Casula

receive this response and the control in the north to Bundeena in the recalled by keying the appropriate Terrigal centre then "votes" on the strength of and approximately 70km out to address number (one to 16) and pressing south, each signal and allocates a channel from In Melbourne, it can be operated the recall key. sea. the base which is receiving the strongest from anywhere in Port Phillip Bay. Two antenna types are available, one signal. It then transmits a signal on the having 2.5dB gain and intended for roof paging channel which says, in effect, "Go mounting, and one with 4.5dB gain and Mobile equipment to channel (say) 25 to receive your call." intended for boot lid mounting. The mobile equipment consists of a The mobile equipment switches to an In operation the system works like this. transceiver, a handset assembly, and channel 25 and transmits its number to 10W total number of channels (96 at antenna. The transceiver features a From the permit base confirmation. is allocated a certain transmitter and includes the necessary present) each base The base acknowledges that it exact distribution being logic circuitry to identify incoming calls, proportion, the the number (a so-called traffic density for recognises select channels, etc. It operates from the based on the projected "handshake" condition), instructs the vehicle's 12V electrical system and each area. mobile equipment to generate ringing mode and has a paging consumes 20W in the standby Each base station also tones in the handset, and completes the channel 88W in the transmit mode. It is normally channel and this is the same (say connection to the telephone line. The When not in accommodated in the vehicle boot but one) for all base stations. presence of the ringing tone, ís the first if monitor the paging can be fitted behind the front seat use, all mobiles the vehicle occupant knows of any of like the speech necessary. channel. This channel, these procedures! is a duplex channel. It The handset and cradle is fitted within channels, If, in the above situation, the base it transmits easy reach of the driver. The handset performs two main functions: receiving the strongest signal had wanted vehicle, and it carries a pushbutton keyboard consisting the number of the already allocated all its channels, the available access of the usual 10 numerical keys, plus eight transmits a list of system would then select the base with channels function keys. There is a readout display, channels (more about access the next strongest signal. with which the dialled number can be later). checked, a green "power on" indicator In addition, it provides the mobile with Vehicle calls lamp, and a red "out -of -range" lamp. a continuous check to show that it is is initiated from a vehicle Numbers may be dialled "on -hook" - ie, within range of a base station. If the When a call is different. As with the handset on the cradle. paging channel is lost the red "out -of- the sequence somewhat which ís An optional auxiliary call facility range" lamp will glow. well as the paging channel each base enables the vehicle headlights, horn, or Let us assume that a call has been common to all base stations, access channel other signal to be activated when the initiated from a telephone to a vehicle. station has a duplex to it. That base can be driver is absent from the vehicle. The dialled number will appear on the which is exclusive via that channel while ever it The handset stores the last number paging channel and the mobile accessed within has any vacant speech channels. When dialled and, if a call is unsuccessful, the equipment, if it is switched on and all speech channels are occupied, and number can be re -dialled by pressing the range, will hear it and respond on the there is no role for the access channel as recall button. It can also store up to 16 duplex channel. it becomes a speech channel. frequently used numbers which may be Any, or all, of the base stations could such,

14 ELECTRONICS Australia, January, 1984 Making it harder for the eavesdroppers One problem with any telephone. circuit that uses a radio link is that of 500M11_3_, privacy. Anyone with a suitable -- EAVESDROPPER'S receiver or, more particularly, a RECEIVER scanner, can eavesdrop on such a circuit. In this regard Telecom warns all subscribers to the mobile 510MHI. system that the circuit is not private 500MHi and that they should exercise ISOLATING NETWORK discretion in what they discuss. V S OM While some eavesdropping may TRANSMITTER TELEPHONE Vir LINE be malicious, ie, undertaken with r intent to defraud or embarrass, most is likely to be based simply on 5 MHz RECC EIVER curiosity. But, either way, it is undesirable. As far as the malicious eaves- place that a degree of undesirable without the output from the dropper is concerned, the random receiver coupling occurs. being able to reach the selection of channels tends to be a transmitter. The telephone pair has to be The only snag is that it is not deterrent; any one subscriber is connected to both the output of the completely effective; some signal likely to appear on any channel and, 'base receiver, to receive the still finds its way back to the mobile, even with the aid of a scanner, it incoming signal from the mobile, and though at a much reduced level. This would be a full time job to monitor to the input of the base transmitter, state of affairs was more or less the band and check each call until to transmit a signal to the mobile. deliberate; designed to provide an the wanted party is recognised. Which means that the output of the effective level of sidetone. The curious eavesdropper, on the receiver is effectively connected to Unfortunately, it also helps the other hand, is likely to listen to the the input to the transmitter. eavesdropper to hear the other side first conversation he picks up. In this This means that a voice signal of the conversation if he regard, until now, listens he has been from the mobile will travel to the carefully. encouraged by the fact that, even base on one frequency and, as well To overcome this and, though he intercepts hopefully, only one as going down the telephone line to to discourage the channel of the curious listener duplex pair, he can the telephone party, will also go from listening if 'still hear both at all he can hear sides of the back to the mobile via the other only one side of conversation. the conversation, frequency channel. Thus the caller in Telecome engineers have recently To understand how this comes the car will hear his own voice come modified the base station about it is necessary to set-up to consider an back to him. This effect is known as provide virtually complete isolation important difference between the sidetone. between receiver radio link and the and transmitter, telephone line. The All telephones produce some using echo telephone line suppression techniques conveys the voice sidetone, and most telephone developed for long signals in both distance trunk directions on a single engineers regard it as psy- and overseas circuits. pair of wires; a -wire" in "two circuit chologically desirable, to a limited The only minor telephone parlance. complication degree, to give the impression that which results is that the mobile user The radio link, on the other hand, the phone is alive. In the case of the no longer hears any sidetone, and conveys the two voice signals on mobile base station there is an some people find this disconcerting. separate channels; a "four -wire" isolating network (sometimes called To overcome this circuit in telephone Telecom parlance. It is at a "hybrid" circuit) designed to allow engineers are modifying the the base mobile station, where the "two- the telephone line to be connected to units to provide wire"/"four-wire" an artificial sidetone conversion takes both the transmitter and the receiver, from within the unit itself.

Thus there will be times when not all in turn, and notes the respective signal called party's voice when they answer. access channels are available and, as strengths. Selecting the base with the But the system does not abandon the mentioned earlier, the paging channel strongest signal, it uses the access circuit at this stage. It continues to continuously transmits a list of those channel to transmit a request for a monitor the signal strength from the access channels are that available. speech channel, together with its mobile mobile in case the vehicle should move So let us assume that the vehicle number. The control centre allocates a out of range of the assigned base station. occupant has dialled a number. The vacant speech channel and instructs the The system sets a level of 10dBµ (10dB number appears in the display window, mobile equipment to switch to that above 11.(V, or 3µV approx) below which is checked, and the occupant then channel. signals become suspect. presses the "SD" (send) button. In fact When it does, there is a further If an incoming signal should drop the number is not sent immediately, but confirmation sequence (handshake) and below 10d14 for eight seconds or more, is held until a circuit has been set up. the stored telephone number is then the system initiates a "hand-off" When the send button is pressed the transmitted directly into the telephone sequence. In general terms this means equipment refers to the list of available network. The occupant hears the ringing that it looks for a base which can receive access channels, interrogates each one tone from the called phone and the a stronger signal, sets up a new speech

ELECTRONICS Australia, January, 1984 15 Telecom's mobile telephone system

r same installation, emphasises the compact A typical handset and cradle installation in a modern car. The This shot, of the and its ease of operation. slightly angled mounting favours the driver's viewpoint. nature of the handset

channel from that base, then "hands off' the call to the new channel. In greater detail, the sequence is as 'J V 0. follows. The control centre, having sensed a suspect signal, transmits a signal to the vehicle which says, in effect, "Co to the paging channel for possible hand-off instructions". At the same time it disconnects the speech channel, but holds the telephone circuit. The mobile takes note of the channel 1 currently in 'use and memorises it, then ,~1.1.srel~y7 switches to the paging channel. At the same time the mobile user hears a warning tone, indicating what is happening. There is no tone for the telephone user, but Telecom engineers are planning to provide this. When the mobile switches to the paging channel it announces its presence It is compact and takes up very little- and transmits its number. All bases The complete transceiver, installed in the boot. the front seat. within range receive the signal and space. In commercial vehicles it can be installed behind report the signal strength to the control it saves. At the time of writing Call charges are based on the minimum centre. If one of these bases reports a money Melbourne have about STD rate for three minutes, varying with which is 5dB better than the both Sydney and signal the time of day, ie, day rate, previous signal the control centre will set 1300 subscribers. As as the current upgrading of the intermediate rate, or night rate. up a new channel on that base, instruct well systems, plans tuture? the mobile accordingly, check that the Sydney and Melbourne And what of the in Brisbane, the next step appears mobile identifies itself on that channel are under way for systems Technologically, and Perth development of a personal (handshake) then restore the telephone Adelaide and Perth. Brisbane to be the before the to and not much larger than circuit. should have a limited service unit, similar have a full hand-held two -metre The whole process takes about two end of 1983, and all should a typical amateur the end of 1984. unit, which could also work into the seconds. service before system. In the event that no better circuit is Telecom engineers are available, or that the circuit is lost in the What it costs Australia's hand-off process, the system The cost structure for the mobile watching these developments closely in it may not be too long autómatically reverts to the original systems is as follows. The mobile the hope that can be introduced into the channel. equipment may be either rented or before they present system. The mobile, system has now been in purchased outright. Rental costs $1000 we would like to operation for over 18 months and has per annum, and the purchase price is In conclusion the very considerable proved to be highly reliable. Users range $3990. There is an installation charge of acknowledge we received from Telecom's from business executives to small $150. Regardless of which option is assistance Sydney Public Relations office, and businesses, and includes a Hansom cab chosen there is an annual network and Melbourne engineering staff, operating in Sydney's Rocks area. All are subscription of $800 and this includes Sydney preparing this story. enthusiastic about the service and the maintenance on the mobile equipment. in

16 ELECTRONICS Australia, January, 1984 leading Edge ,,,.- v S100 Slaves ,....",,..,. d'W,:. From Intércontioental Micro Systems

LEADING EDGE? EVERYONE SAYS THAT. PROVE IT. When you read the features, the - -- specs and the description, we're betting you'll be impressed by the capabilities of our CPS -MX slaves. Compare them to any of w`1é ,i r the competition. And when you ;`; i`:e.w----+ discover our prices, we hope you'll allow us to r help you With your distributed processing needs. FEATURES IEEE 696.1/D2 S100 bus compliance. Compatible with CPZ-48000 SBCP, any Z -80A based CPU with extended address capability or 16 bit based CPUs complying with IEEE 696.1/02 bus specification. Z-8OB' 6 Mhz (CPS-6X) or 180A 4Mhz (CPS -4X) operation. Two synchronous (CPS -MS) or asynchronous (CPS -MA) serial I/O ports. TURBOdos" & CP/NET" compatible. Master confiscation of slave memory for diagnostic purposes. Two parallel I/O ports; eight data bits + 2 handshake lines per port. MORE THAN JUST A CPU 64 Kbytes of onboard dynamic RAM. Master/slave memory -to -memory transfers under DMA control ® 571 Kbyte/sec transfer rate when used with CPZ-48000 SBCP. The Software selectable baud rates. C148000 From Intercontinental Usable as an intelligent I/O processor in single user systems. FEATURES ARE FINE BUT IT'S PERFORMANCE THAT COUNTS. Micro Systems The model CPS -MX slave processors are Z -80A (4Mhz) or Z -80B (6Mhz) based single board computers compatible with TURBOdos and CP/NET distributed processing operating systems. CPS -MX slave processors together with an 5100 bus master (host) like A HOST OF USES Intercontinental's CPZ-48000 SBCP, constitute a high performance, high The CPZ48000 will act as more than a CPU. Use it as a multi -user -tasking throughput network which can be integrated into most S100 bus mainframes. host, a multi -processing host or a CPU with high speed serial data link capability Master/slave communications take place over the S100 Bus via slave/host for network architectures. It will also act as a highly sophisticated single board bidirectional memory transfers under control of the host processor. In an system. architecture where the host is the CPZ48000 SBCP, those memory transfers may take place under direct memory access (DMA) control. The data transfer 'SOPHISTICATED SINGLE BOARD SYSTEM' rate under DMA is 571 Kbytes/sec which is a 300% increase in speed over MEANS MULTIPLE FUNCTIONS. Z80A block move rates. Data transfer rates in non -DMA mode are'onehalf of Like an onboard floppy disk controller, 4 channels of DMA, priority interrupt the maximum transfer rates for I/O mapped slave processors. Data transfer rates controller, memory management, 64K onboard RAM, 2K onboard EPROM, 2 in DMA mode are up to one -sixth of the maximum transfer rates of I/O mapped parallel and 2 serial ports. slave processors.

And more: IEEE 696.1/D2 S100 compliance. The CPZ-48000 will interface with.most Winchester Storage IEEE S100 bus products on the market. Z -80A,' 4Mhz Operation. - added to your computer Floppy disk controller (FDC) with onboard data separator. Single or double sided. Single or double density. 8" or 51/4". The choice is yours. system the easy way! Two synchronous or asynchronous serial I/O channels (SIC). One channel can MONITOR DYNAMICS designed the HDC1010 series Easy Disk be programmed in direct memory access (DMA), interrupt, or programmable Controllers to interface a maximum variety of Winchester Disk Drives to I/O mode. any S-100 system with a minimum of complexity. The HDC-1010 Two parallel I/O channels (PIO). One channel is programmable in DMA, interfaces to many types and sizes of 51/4 interrupt or programmable I/O mode. drives - inch (Seagate ST -506), 8 inch (Shugart SA -1000) and 14 inch (SA-4000) compatible, Four channel DMA controller. including 8 inch Memorex/Fujitsu drives. The New World Computer 64K on board RAM. Bank selection puts 4K -64K under software control. Mikro Disk**** (5'/4" and 8") Drives are supported by the HDC-11111 Memory management unit (MMU). Addresses up to 16 megabytes of system memory. Controller. Only four switch selectable I/O ports are used, fully compatible with the IEEE -696 standard and all known variants. Eight vectored priority interrupts are chained with serial and parallel I/O interrupts for use with Z -80A mode 2 interrupts. A single chip microprocessor, coupled with a simple, high-speed PROM

Provisions for 2K or 4K onboard EPROM. A boot up function and monitor in a based micro -controller provides bit -slice performance at a fraction of 2K EPROM is supplied. the cost and power consumption. Several Innovative features reduce , Software selectable baud rates. operation system overhead and drive size, including automatic seeking, IBM Bisync, HDLC, SDLC and other protocols. All are handled through a soft error recovery; write verify and bad sector remapping. Z -80A SIO chip. A typical disk operation requires only the new ID parameters (if any) CP/M, " MP/M" and Turbo -DOS" operating systems available. and a read or write command to be sent to the controller, which returns Turbo -Disk° implementation included. an error code upon completion. What could be easier? absolute electronics 483 Centre Road, Bentleigh, 3204 TELEPHONE: (03) 557 3971

ELECTRONICS Australia, January, 1984 17 1 ur Arthúr McClay of Auckland, New Zealand, comménced radio listening in 1911 when it was illegal to operate a receiver. Recently he related to "Eléctronics Australia" the story of his activities both as a radio listener and later, as a pioneer broadcaster.

Today we take it for granted that our He,had always had an interest in elec- participation in many radio hobbies may tricity and then learned of the possibility be carried on without any restrictions, of transmitting and receiving. He had a. but in 1911 there was a fine of £500 for two -roomed cottage attached to their any New Zealander found operating a home at 13 Gordon Place, Wellington radio receiver. At that time, only an of- where he began his hobby and this was 1 ficer of the New Zealand Post & used up to 1914 when radio operations Telegraph Department was allowed to were suspended during the war. Then, in was use receiving , and/or receiving - 1922 through to 1925, the same site transmitting equipment. In 1903 the the home of broadcasting station 2YK NZPO had established a complete Wellington. monopoly on both ,radio transmitting As a student of Wellington Boys' Col- and receiving and there was no en- lege in 1911, Arthur McClay was in- couragement for any person in New terested in press reports on ad- Zealand to engage in the radio listening vancements being made in Marconi I hobby. telegraphic equipment and radio com- New Zealand hobbyists were disap- munications. He made up his mind he learn all he about this new pointed when, in 1911, citizens in other would could 111 parts of the world were able to get a per- marvél of science. McClay began his career in radio mit from their Post Office and take up Pursuing the hot. ')y in 1911 presented Arthur in 1911 when listening to radio was radio listening experiments. The major difficulties, as it was not possible - illegal. . courage, vision, and determination of to legally purchase equipment or obtain fascinating subject of three young Wellington residents finally books on the The Post Office operated low powered Although accomplished this listening facility for all wireless communication. transmitters in Auckland and Wellington was in its infancy, New Zealanders. wireless telegraphy and receiving and transmitting sites at recalls were ships coming to At 85, Arthur McClay still vividly there sufficient Aranui in the North Island and at Awarua his in 1911, when he lived New Zealand to encourage radio listen- listening days in the South Island. These two stations ing, this was an offence at that time. in the suburb of Newtown, Wellington. but had remarkably good coverage, world wide. The ships coming to New Zealand used either Marconi or Telefunken radio- telegraphy systems. Early in June 1911, while walking down a Wellington street at dusk, Arthur Mc - Clay saw a young man pulling up an aerial between two trees, with the lead- in wire running into the basement of a house. He was overcome with amaze- ment, for here was a fellow enthusiast + I like himself. This resulted in his meeting

L 1, with Brian Robinson who turned out to , & , . r i be a qualified electrician employed by 'r ,, * t3.11' t Turnbull & Jones, electrical engineers of '« I Wellington. He had built a receiver - { which was a perfect replica of the tr..-'11111111 Telefunken shipboard receiving unit. (.41 ow *' In the course of his work, Brian Robin- son visited many of the overseas ships which were in port, where he met many - - ship's officers who, over the months, had supplied a great deal of equipment to him. One friend was Harry Tuson, who was a wireless operator on the "SS Honeycomb coil receiver at 2YK, New Zealand's first radio station. Ulimaroa", a Huddart Parker vessel sail -

18 ELECTRONICS Australia, January, 1984 ra 10 10' , vioRRC! 1SHEV t ..

- K1¡

Bob Apperley (left) and Hugh Simpson, co-founders of 2YK Wellington. Arthur McClay's home in Wellington, New Zealand, was the site of many early experiments, and in 1922 the location of the first broadcast station. It was obvious that the gale had put out The New Zealand Post Office had drawn the Wellington Post Office receiving sta- up plans for a national network and were tion and the distress messages had not looking for promoters to operate a been heard. ,ronopoly type of broadcasting service A decision had to be made, knowing with a 10 year contract. It was also that radio enthusiasts faced prosecution envisaged that commercial broadcasting for possessing and using a radio receiv- would be allowed as a secondary means ing set. They decided that the vessel in of obtaining extra operational revenue. distress was more important than any Arthur McClay then applied for a subsequent charges of illegal operation broadcasting licence for three years so of radio equipment, and so the Post Of- that experimental broadcasts could be fice was informed. The ship and crew undertaken. With a power of 15W, on were safely brought into Wellington Har- 1090kHz, he felt he should reach the bour, following the action of the radio greater part New listeners. of Zealand during night time. The first broadcasts were to be The Minister of Justice was made four nights per week from 7.00-11.00pm aware of the fact that the law had been and, in addition, the station could be broken and a fine of £500 and confisca- Brian Robinson was one of the first radio used to transmit any special an- tion of their equipment was possible, but enthusiasts in New Zealand. nouncements as required. he was convinced that such drastic At measures were not justified and the the same time, Professor Jack in ing between Wellington and Sydney, listeners were exonerated. The three Dunedin was experimenting with radio and he procured anything the two en- listeners were then issued with official broadcasting and the signals from that thusiasts required for their hobby. station were radio receiving licences which had to be also heard in Wellington. Arthur McClay soon acquired a The similar renewed each year and this brought Dunedin station subsequently receiver and transmitter and became about the introduction of radio listening became the responsibility of the Otago proficient in Morse sending and receiv- Radio on a recognised legal basis in New Association, which still broadcasts ing but, aware of the severe penalties a non-commercial program in Dunedin Zealand. In 1914 when World War I facing them, they never transmitted on on 1431kHz, broke out, the Post Office requested that and recently celebrated 60 the ship -to-shore frequencies. Utmost years of the equipment be dismantled and aerials broadcasting with its slogan care was taken to keep the aerials out of "Pioneer taken down. Transmissions were silenc- Radio". sight in daylight hours and nightly ed during those four years. Soon a band of enthusiasts gathered transmissions in Morse were conducted around Arthur McClay in preparation to between the two enthusiasts. Plans for a post-war launch 2YK Wellington. The station was Early in 1912, another potential listener given its licence and a United States made himself known to Arthur McClay; broadcasting network company, the Federal Telephone and Guy Tinney, employed by the Post Of- After the war, Arthur McClay returned Electric Company, provided some of the fice as a landline telegraphist. The three to Wellington and renewed his interest vital equipment which was unable to be enthusiasts began meeting on a weekly in radio. While on war service, Arthur made in New Zealand. 2YK took the air basis, chatting over what they had heard became involved in radio transmission in mid -July, 1922 as promised and the and comparing entries in their log books. and when he returned to civilian life, was nightly transmissions were heard all over One severe stormy night in July 1912 well prepared to continue his dream of New Zealand. During the three years Arthur McClay was awakened at mid- operating a broadcasting station. He from 1922-25 a trio of enthusiasts, Bob night by his friend Guy Tinney, who was quickly visualised what radio broad- Apperley, Hugh Simpson and Arthur very agitated. He had been listening and casting could do for New Zealand and its McClay, gave up all their spare time and had heard a vessel in distress, drifting people as a means of communication much of their finance to keep the station towards the reef in Wellington Harbour. and entertainment. operating.

ELECTRONICS Australia, January, 1984 19 ROD IRVING ELECTRONICS. 425 HIGH ST, NORTHCOTE 3070 VIC PHONE (03) 489 8866

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48-50 A'BECKETT ST, MELBOURNE 3000 VIC PHONE (03) 347 9251 Moll Order Delivery Inset. bees: Minimum Pack and Post $3.00 for Australia Post. Please allow exttes ter bigger orders and Cemned, Alrmalt or Registered Post. Minimum order Is 55.00. Please address orders to Moil Order Department. PO BOX 235, NORTHCOTE. 3070, VICTORIA. PHONE (03)4811436. broadcasting was created throughout Arthur McCIay -NZ radio pioneer the country, and between 1922 and 1925 the NZPO issued ten short-term

t? radio broadcast licences. As the end of the three year term drew Iear Ile - ilear Ile. - it Vnowtl to All illen that \I near, a plan to encourage participation üü in establishing a national radio service was announced. A dinner was held in . `11.1ka J`s; d). 5 Wellington with selected guests in- aving Veen an E3E}lUnent of tfe A rient Craft terested in providing a national service Iltowlt as "Amateur labio- for 25 or more Years for New Zealand. Regretfully one of the guests ridiculed is IerehlJ EnrrtUeh as aMember of Ye the future of broadcasting. The three years of tremendous effort by the three broadcasting pioneers had come to an untimely end, due to the lack of Oth imrni' Cub knowledge of those people who had the Operoror' Certdicole No financial ability to make radio broad- G.O.M. in New a financial Dore of Origino? licer -e casting Zealand success. Like all pioneers, the operators of 2 2 2YK were ahead of their time. It was not "5".9...1;11..1,,,,,'-q 'o`X until 11 years later, in 1936, that com- "-\ 515 11s,%: É mercial radio came to New Zealand. Secretory Date M1 L Xr !98n Certijieau No.623. Due to lack of financial support 2YK WA\\u,\, closed, but the pioneer spirit in Wel- .. lington was still evident and soon after the Dominion Radio Company was form- ... ed to carry on where 2YK left off. As the Dominion Radio Company could only Arthur McClay's certificate of service to amateur radio. get a short-term licence, the operators of 2YK agreed to transfer their licence. Over the three years of 2YK's broad- The first outside broadcast also took 2YK continued to operate and, later, casting, many deserving causes were place in Wellington when a concert was 2YK along with 1YA Auckland, 3AC given help over radio. There were even held in a city department store on a Christchurch and 4YA Dunedin were requests from Government House in Friday evening. Loudspeakers outside taken over by the Radio Broadcasting .Wellington for records to be played, the store attracted a huge crowd, and Company of New Zealand on August 30, while the station took part in many firsts this led to traffic being disrupted. The 1925. 2YK became 2YA, which' is still for New Zealand, including the first store had to pay a fine for this disruption. operating today under the control of broadcasts of general elections in 1922. Due to 2YK Wellington, interest in Radio New Zealand.

FUNDAMENTALS OF SOLID STATE Fundamentals of Fundamentals of Solid State is in its second reprinting, showing how popular it has been. It provides a wealth of information on semiconductor theory and SOUD STATE operation, delving much deeper than very elementary works, but without the Airs .n, MN/ e.trm.euun ,andrans.e.e.. maths and abstract theory which make many of the more specialised texts very heavy going. "Solid State" has also been widely acclaimed in colleges 1/UVRES*101 RUVUE as recommended reading - but it's not just for the student. It's for anyone who wants to know just a little bit more about the operation of semiconductor devices. HERE ARE THE CHAPTER HEADINGS 1. Atoms and Energy 10. The Bipolar Transistor 2. Crystals and Conduction 11. Practical Bipolar Transistors 3. The Effects of Impurities 12. Linear Bipolar Applications 4. The PN Junction 13. The Bipolar as a Switch 5. The Junction Diode 14. Thyristor Devices 6. Specialised Diodes 15. Device Fabrication orl 7. The Unijunction 16. Microcircuits or "IC's" 8. Field -Effect Transistors 17. Present and Future 9. FET Applications Plus a Glossary of Terms and an Index.

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This instalment of Forum really started "good news and bad news": the digital tape master is there to be out as a routine review of Telarc's On the one hand, it appealed as an heard on the compact disc. That is how compact disc version of the original intriguing exercise in digital/analog it should be. "1812". However, I found myself recording, with the reassurance, at a Aware of this background, my first step deleting so much of what I felt could be personal level, that my equipment could in preparing to review the compact disc said, and should be said, that I tore it up, trace the tortuous track without was to "fast -forward" it to the 12 -minute changed the typesetter's catch from apparent distress. On the matter of mark and to set the volume control so "Records" to "Forum" and started again. quality, I said: that the cannon shots which followed To give it its full title, the disc in "What tends to degenerate into noise- would register around 100 watts per question is a recording by Erich Kunzel on -noise in other versions emerges here channel, as indicated on the amplifier's and the Cincinnati Symphony Orchestra as a series of incredibly clean and gutsy LED output meters. This done, I pressed of three works by Tchaikovsky: the transients, that literally shake the house" the Repeat/Skip pad to get back to the "1812 Overture", Op 49; "Capriccio - all this, of course, by thé standards of start and commence play - leaving the Italien", Op 45; and "Cossack Dance the late '70s. volume control untouched. from Mazeppa". It was recorded in 1979 But I also expressed a reservation that, However, I did switch the level in the historic Cincinnati Music Hall, by the time one had matched the indicators to the 1 -watt position but the which has been "home" to the Orchestra cannon shots to the capabilities of the record had been playing for more than since 1896. amplifier and the welfare of the two minutes before the peak hold I first laid hands on the record in loudspeakers, the soft passages could function reached even that modest level. November '79 as a digitally sourced well drop into the noise ambient of an For the most part, the opening stanzas analog pressing. This was before it had average on -street suburban dwelling .. . ranged only up to about 100mW, with received any significant publicity in "such is the dynamic range". Certainly a much of the sound in the 1-10mW range, overseas technical magazines and it was judicious setting of the volume control and some of the lingering die -away accompanied by a handwritten note would be necessary to preserve the tones not even registering 1mW. from the Australian distributor to the vitality of the softer passages. Perhaps I should add that this last effect: "Please be careful on first playing, Overseas reviewers were no less observation was possible only because it as per the warnings on the wrappers, &c. intrigued by the technical implications of was made when the house was very We wouldn't want you to blow up a the disc and, in due course, Telarc's quiet and with virtually no traffic noise speaker or two!" "1812" became something of an industry from the street outside. While the recording climaxes in the benchmark - possibly the most analysed I had a strong urge to turn up the massive sound of the full orchestra and and written about disc in LP -stereo volume so I could hear the music to brass band, augmented by the bells of a history. better advantage, but I knew what large carillon, the real reason for the Responding to the publicity, Telarc would happen at the other end. Besides above apprehension is a succession 'of later issued a UHQR (ultra high quality that, the unwritten hifi code suggests sixteen ponderous cannon shots, which recording) version prepared by the that, when presented with an example of punctuate the music during the last Victor Company of Japan (JVC) under the wide dynamic range, it should be couple of minutes of the performances. title "Super -Cut 1812". They also cherished and respected and preserved, Produced by authentic 19th century included the climactic section as a test even if you don't like it! cannon, the sound was digitally track in their "Omnidisc" (reviewed in While not wanting to set too much recorded and subsequently computer January '83). In both cases, the level of store on the LED power output read- mixed into the master tape. the cannon was lifted by 6dB - thereby ings, they would certainly be a lot According to Telarc's jacket notes, the rendering it untrackable by all but a few more accurate than subjective cannon -shot transients concentrate in cartridges! "guesstimation". It may come as a the region of 2kHz to 3kHz, with the surprise to realise that the range from follow-up boom ranging down to 6Hz. Compact disc version 1mW to 100W (per channel) - from To commit the final mix to analog disc Now we have the compact disc faintly audible to house-rumbling in this poséd a major challenge to the JVC version, with its ponderous cannon shots case - represents a power ratio of Cutting Centre but they coped with it untroubled by any potential tracking 100,000:1 or 105 or a mere 50dB. and, even to the naked eye, the pitch problems or by acoustic feedback from Allowing for some latitude in the and deviation of the resulting groove is the loudspeakers. And, at the other readings and the observations, a figure probably the most spectacular that you'll extreme, there is no trace of noise from of 60dB would be generous. ever see. the disc or the player to mask the In the face of such remarks, how When I reviewed this first disc in the whisper -soft sounds that lead into or out casually do some audiophiles aspire to a February '80 issue, I did só on the basis of of the pianissimo passages. What is on dynamic range of 70, 80 or 90dB, as if it

26 ELECTRONICS Australia, January, 1984 too much of a good thing!

was so essential for realistic like Telarc take pride in not modifying supposed festivities on the outskirts of reproduction, so natural to the microphone mix or level settings Moscow! accommodate in the home and so easy once recording the has commenced, so In an article elsewhere in this issue, I to achieve technically. If you feel that that the dynamic signal range on the disc mentioned Bill Andriessen, Chief way, I suggest you get hold of Telarc's should approximate that up -front in the Applications Engineer for Video and "1812" in CD and work through all its audience. Audio for BASF in Germany. Chatting implications. While this may appeal to the purist as about orchestral recordings, during a In my case, any extra noise at all, in an entirely logical approach, there is a recent visit to this country, he what would have passed as a quiet substantial body of opinion to the maintained that the dynamic range of suburban house, would have masked contrary. The thinking is that, in an many digitally sourced analog recordings the lingering fragments of sound, being auditorium, listeners are able to was too high for comfortable listening in, reproduced at milliwatt levels. I was concentrate with ears and eyes on the the home, and that this would be an listening very close to the bottom of my source of the tiniest sound; in a domestic undesirable feature of many compact particular domestic "dynamic window". listening room, the visual stimulus is not discs. While realising that constraints had And yet, 13 minutes later, with the available and the whole of the lower and to be applied of necessity to the older volume control untouched, the system medium levels of sound should all -analog discs he felt that, in terms of was running to 100 watts per channel, therefore be made more prominent to dynamic range, they were nearer the which I regarded as being a prudent compensate for the loss of mark for agreeable home listening. limit. communication. But you have a 200W per channel In the fortissimo passages, so the Telarc's "1812" system? Fine; that gives you an extra 3dB reasoning goes, some restraint may be This brings me back to my earlier of dynamic range! desirable, out of consideration for comments about Telarc's "1812", which If you want an extra 10dB, over what members of the household who may not goes well beyond even a direct transfer I've been talking about, you had better want to be involuntary participants in the from concert hall to disc. For sure, the go shopping for a 1000W per channel amplifier, or for hifi loudspeakers that will help make up the extra decibels by way of added sensitivity. Neither are There's something that needs to be said!

easy to come by. In the September '83 issue, I indulged in a few reminiscences about

The fact is that high dynamic range is "Forum" or "Let's Buy an Argument" and where it all started. I rounded it off easy to dream about and drool about, with a reference to a then -current argument about the shape of the groove not too difficult to achieve with modern which would be produced in a lateral disc recording by a square -wave input signal sources, but very demanding as a signal. The problem was neatly resolved by a final year engineering student house guest! ANT who we came to know later as A. N. (Neville) Thiele, the Australian engineer primarily responsible for sorting out the mathematics of vented Using the medium loudspeaker enclosures.

At the end of the article, I In saying this, I am not belittling, in any made a throw -away remark to the effect: "There's sense, the achievement of wider just one thing: if a square -wave signal produces a triangular -shaped groove, dynamic range for signal processing what kind of a groove would you get from a triangular signal? A number of generally. The wider the dynamic readers could not resist the challenge and their reaction might be summed up window available, the more certain the thus: consumer can be that the signal which "I realise that it was a rhetorical question; that you really weren't looking for ultimately reaches the listening room an answer but I worked it out anyway. Thanks for the stimulation!" will be clear of the noise floor and clear One reader, C.M. from Moonee Ponds, Victoria, came up with about three of overload - qualities that certainly foolscap pages of closely -spaced text, plus another couple of pages of could not be taken for granted with diagrams that would have taken quite a lot of effort, time and space to turn into traditional analog systems. an article. Not only that but C.M. concluded with the remark "Don't ask for the However, it does not follow that, groove shape of a sine -wave!" because a record/playback system is At this late stage in the history of analog disc recording, I do not propose to credited with a dynamic range of 80 or pursue the matter but simply to assume that, within the frequency limits of the 90dB, it should carry a signal that system, geometric waveshapes can be recorded and reproduced, and that appears, subjectively, to fill that window. the groove inscribed in the vinyl is well able to look after itself. It would be unbearable if it did! What we Right now, any surplus lecturing or writing genius could be used to better can rightly expect is that the recording advantage, unravelling for the non -specialist the mysteries of digital encoding, be subjectively silent during breaks of error correction, data insertion, bit manipulation, and decoding, on which the signal, and that it handle, without compact disc depends. The specialists obviously understand what it's all crushing, those fast rise -time transients about and can talk freely to one another in -the digitalese dialect. The need is that defy analog tape to capture - that for someone to translate it into plain English that ordinary mortals can under- add a glass -hard edge and immediacy to stand and use to create the mental images that most of us rely upon. the notes of a piano or acoustic guitar. It would be humiliating indeed if we technical writers had to be content in In general, the subjective dynamic future with a block diagram and lines marked "signal in" and "signal out", with range should never need to exceed that no way of explaining what goes on in between! That's about where we stand likely to be experienced at the actual at the moment. performance. These days, companies

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28 ELECTRONICS Australia, January, -1 984 FORUM - continued jacket carries the usual note about the brilliant. But as a recording, in any of its itself varies too much - or has too wide level being unchanged during the course forms, to pass across the counter to a hifi a dynamic range. It is partly for this of the recording but that could have novice, it really is on the edge of reason that AM broadcast stations applied only to the orchestral practicality. frequently monitor and/or limit their performance. As such, it's the type of recording that programs to achieve a more constant To the orchestra, at full blast, Telarc record producers should tend to back level of loudness for in -car or casual engineers subsequently added the away from rather than emulate. There's listening. sound of a large carillon from elsewhere _room on the shelves for the odd "1812" A commonly quoted dynamic range in plus Ohio, that of the cannon - the with real cannon; for the organ figure for convenient home listening is level of the latter determined as much recording with everything from the 45dB - perhaps a little more for an by technical considerations as anything tiniest pipe to the 64' thunderer; for the attentive audience. For in -car listening, else. Evidence of this is the issue of steam train that emerges from behind the figure could be as little as one-third subsequent versions with the level of the the song of a distant magpie to clank of this. If such be the case, how could cannon raised by a further 6dB. past two metres away! motorists possibly enjoy compact discs, The result is a recording quite different Recordings like that have their place which frequently feature wide dynamic from what I referred to earlier: one that for special occasions but please: not all range, through a dynamic "window" only can accommodate high-speed transients the time. 15dB wide? that add "bite" to the sound without What we need for everyday listening With this in mind, I recently raised the seeming to be loud, and without are recordings which are free of noise, question of compact disc players in cars endangering the system because of their and which distortion overload, and offer with an executive of a potential supplier very brief duration. a dynamic range which provides a wise of such equipment. By contrast, the combination of between what is compromise He admitted that movement and orchestra and bells which climax the appropriate for the performance and vibration in a vehicle could conceivably "1812" is very loud to start with, but the practical for in -home listening. have upset disc tracking but, he said, that cannon blast through it all as sustained, If it transpires that the ideal dynamic problem had now been overcome. very high energy, very low frequency range is about the same as the last pulses, well able to wreck loudspeakers, generation of analog discs, we should He admitted also that high temperatures in a car might once have as it did, I believe, for some exhibitors at not feel cheated. Let's just enjoy it and a recent Consumer Electronics Show in be thankful that the combination of caused compact discs to warp but that the USA. They turned up the quiet digital and laser technology has obviated was no longer a problem, either. section too far and weren't prepared for many of the attendant problems of the" What about a possible problem with the big boom that followed. analog system. excessive dynamic range? He was sorry

I remarked is but he hadn't heard about that one, As earlier, Telarc's "1812" discs in cars an interesting and intriguing exercise in Compact although he could see what I meant. recording, first on LP -stereo, now on A matter which arises out of this, and Good grief! compact disc. But it is one that perches one which I mentioned on a previous Unless the manufacturers can come up, on the very edge of practicality as a occasion, has to do with the proposed with a practical, switchable volume consumer recording: use of compact disc players in cars. For compressor that does not do dreadful Some phono cartridges will track the the ordinary family sedan the definition things to the quality, compact discs may LP version; others will not. CD players of what is "practical" by way of dynamic well be identified individually as should handle the new recording range may be quite different from what recordings that are or are not suitable for without difficulty but how the rest of the can be accepted in the home. use in the family car. system will cope with the signal could be Quite apart from possible driver But, frankly, it sounds like a fad to me, anybody's guess. distraction, the ambient noise level in a - a knee-jerk market reaction. As a Unless the house is quiet enough to family car can vary widely and abruptly source of pre-recorded music in a car, allow the softest passages to be heard at with traffic conditions and road speed the compact tape cassette meets the milliwatt levels, the cannon shots may and it is difficult to set the radio or player need so well that I cannot, for the life of overload the system, almost irrespective at a suitable median level, if the program me, see why it needs to be discarded.. of its power rating.

A - low powered amplifier system would have great difficulty in playing the recording through, unless the volume V ; , '; '- control is readjusted as necessary, or f °. self-limiting in the signal chain crushes ''. .. . q the signal peaks in a not -too - objectionable manner. The fact that I could describe the Talarc "1812" as "on the edge of practicality" explains why I could also apply to it the misquoted slogan: "How not to make a recording when you're making one". As a technical exercise, as something to argue about, as a challenge to replay systems, as a demonstration of bass -end = Power, the last two minutes of the Overture containing the cannon are - _ ELECTRONICS Australia, Januáry, 1984 29 by NEVILLE WILLIAMS Welcome to 1984 and. OC newera in u'io ¡'ea To date, domestic video and domestic hifi have remained substantially independent, linked only by predictions that they must one day get together. It should all begin to happen in 1984, with VCRs, broadcast television and AM radio all acquiring stereo sound, and moving in to share the hifi system with tape and compact discs. (National Panasonic)

Back in 1982, the announcement of found it when their engineers came up hifi-stereo sound for Beta format video with a method of recording a stereo pair seemed to be little more than the latest of FM sound carriers on the tape, manoeuvre in the long -running battle without disturbing the existing video and to be recovered and decoded during between Beta and VHS - another talk -up audio signals. It offered the potential for subsequent replay. feature to win a few more sales. There true, hifi-stereo sound while preserving Sound quality would be in line with was little to suggest, at the time, that the compatibility with existing Beta format accepted hifi standards, with a development would help to breathe equipment. substantially flat response from new life into both formats and, indeed, Sony engineers had realised that a 20-20,000Hz, compared with a rather have an important bearing on the whole substantially unused frequency segment unreliable 50-12,000Hz for a audio/video scene. But that's the way it's existed in their NTSC Beta system conventional VCR analog soundtrack. looking now. between the chrominance signals Signal/noise ratio, in stereo mode with NR (noise reduction) would jump from Hifi-stereo sound for (predominantly below 1MHz on the tape) and the luminance signals the mid '40s to at least 80dB. There Beta & VHS home video (predominantly above 1MHz). Into this would be a 10 -times reduction in Back in 1982, Sony were concerned space it would be possible to drop a pair harmonic distortion (typically from 3.0% that the Beta group held only about one- of sound carriers, frequency modulated to 0.3%) and a huge reduction in wow third of the world VCR market, with the respectively with the left and right stereo and flutter (from about 0.3% to .005%). prospect that they could slip even audio signals. The extra carriers would Overall, the quality would fall marginally further behind. Sony needed some simply be fed to the video heads, along short of compact disc standards but inducement for consumers to switch with the video signals, and would compare more than favourably formats and they appeared to have simultaneously imposed on the tape - with the best analog "black" discs. Keen to press home their advantage, Sony said or let it be said that the 9.ar .. - we ..q niv::...; ...,.2 - - NORMAL ANALOG } method would be exclusive to the Beta AUDIO TRACK 230° AUDIO FM -.- 0,:..//'ii ilk r format because no equivalent TRACK P10:.« 0..:'yi s, accommodation existed in the VHS s%.v/i: ,/r. configuration for extra carriers - at least, CONTROLRACK NORMAL VIDEO FORTRACKS.I /i i0".iá.1" not without significantly compromising 26° FOR VHS, 27°7° FOR BETA "¡i -fat q1° ii picture quality.

(NOT DRAWN TO SCALE) It was the wrong kind of challenge to direct Matsushita, In the D-MPX (depth multiplex) system, to and to their 50% owned subsidiary JVC, which holds the the FM soundtrack is recorded deeply key patents into the magnetic layer, then overlaid by in the VHS system. In short order, both companies had announced the normal video track, which In the D-MPX system, used in both the development of a practical VHS hifi- penetrates only about the top one-third VHS and Beta/PAL hifi VCRs, special stereo sound system and both had of the layer. The radically different heads to record the FM audio signal demonstrated prototype equipment to azimuth angles minimise mutual track just ahead of the normal video selected technical writers. That interference during playback. heads. served to spread the message: VHS owners would

30 ELECTRONICS Australia, January, 1984 Colour viewfinder for home cameras Hitachi, Japan, has announced the development of a practical 38mm (diag) colour picture tube suitable for use in home video camera electronic viewfinders. To date, only monochrome tubes have been practical in consumer equipment. It would appear that Hitachi have been able to apply a principle that has hitherto been considered too critical for mass production. A - .... - ..,.a é single beam sweeps across the tube face, which carries a very fine pattern of red, blue and green lines. The beam is modulated so it causes only the required phosphors to fluoresce. Internal light sensors and a feedback system ensure accurate registration. 0 0, The tube uses a beam deflection. angle of 36° and has a claimed resolution of 160 lines. It operates from the normal 12V camera supply line and consumes 2.7W. In The National SV-P100 is a digital audio recorder using a VHS cassette and tape making the announcement, Hitachi mechanism and internal analog/digital conversion. With performance figures which said that the tube should be ready surpass even the new hifi VCRs, if makes available to the home recordist audio quality for the market in early '84 but that which rivals that of a compact disc. its price level would confine its use initially to new top -of -the -line Main Signal Flow Chart of the SV-P100 cameras.

imposed on the tape in a quite different manner. Two extra heads are fitted to the video drum with azimuth angles of ±30°, LO hi .-. which track just ahead of the video LINE MWt «w /o OTrele, heads (the latter with the normal VHS AO Me/ a,Cw. azimuth of ±6°). The extra heads impose the twin sound carriers on the tape, the Eqtal .b.o configuration and drive being so cprryemee, Op. parCach Ce0Ceall PIOCeS arranged that the FM signal is recorded deeply into the magnetic layer. Lo JVC, the L WE OUTPUT level kndcav major licence holders for the VHS system, describe the method as D-MPX .EACIPhIONE OUTPUT ,5 (depth multiplex) sound recording. As is normal in a VCR, the video signal, which is recorded an instant later, Reproduced from a National brochure, this diagram shows the signal path through the penetrates only about the top one-third SV-P100 digital audio recorder. PCM adapters offered by National and Sony can bé of the magnetic layer, so that it has very used with normal domestic VCRs to produce much the same endresult. little effect on the sound carrier recording. not need to switch formats to gain the should become available in quantity During replay, because of the radical advantage of hifi-stereo sound. from now on - for the NTSC market, at difference in azimuth angle, the video Sony officially launched Beta hifi in the least. and audio signals can be recovered by NTSC format in April '83, along with a The release date for PAL format hifi the respective heads, with very little hundred or so cassette features carrying VCRs in Australia is as yet uncertain but mutual interference. both normal and hifi stereo sound. "around mid year" is as good a The major performance specifications Other Beta equipment manufacturers prediction as any, with both formats quoted by JVC for VHS hifi are identical were reportedly preparing to follow suit. running about neck and neck! to the Beta hifi figures listed earlier: Matsushita announced their VHS hifi The VHS hifi system uses a somewhat frequency response 20-20,000Hz; model NV -800 about one month later different approach from the original dynamic range with noise suppression (May '83) although, overall, the VHS NTSC Beta concept to achieve what, at 80dB; wow and flutter less than .005%; group were about six months behind. this stage, appears to be an identical end total harmonic distortion less than 0.3%. But an inventory of VHS hifi software is result. It uses a pair of FM sound carriers In addition, they quote audio channel now building up and the hardware in the 1 to 2MHz region but they are separation as greater than 60dB and

ELECTRONICS Australia, January, 1984 31 impending format change has and, indeed, the TV industry as a whole, diminished sharply. has been preoccupied with the visual A whole new era No less to the point, Matsushita is side of programming,, with sound reported to have reached agreement relegated to a secondary role - for the with Grundig and others to establish a most part medium quality mono. in Audio/Video joint facility in Europe to manufacture Some TV broadcast stations in video equipment. This is being Germany and Japan have indeed been audio/video crosstalk under the most interpreted as a move to phase out the transmitting dual -channel sound (stereo extreme conditions as not more than European V-2000 system in favour of and/or bilingual) on a regular basis and 20%. VHS. others elsewhere (including Australia) It was naturally assumed, when Beta have been doing so on an experimental and VHS hifi were translated from NTSC The 8mm video format: basis during the past year; this against a to the PAL format, that each would five years away? background of tedious debate about retain its original and distinct technology The tip is that the proposed new 8mm systems and standards. such was not to be. When PAL - but now pushed back As we write, however, the Australian format Beta hifi was jointly video standard will be by five years or so, while the industry authorities and the TV industry appear to demonstrated in Sydney by Sony, Sanyo and consumers alike gain more mileage have reached agreement on the German and Toshiba, it was revealed that Beta from the systems they already have. system and an official announcement to hifi had been switched to essentially the During that five years, the 8mm format that effect can be expected at any time. same technology as VHS hifi: separate may well be refined and re -developed So, if and when you shop around for audio heads with 30° (approx) azimuth from one that was essentially camera - your new VHS or Beta hifi VCR, make and depth multiplex recording. based to a truly universal system with a sure that it is fitted with a tuner able to While the choice of the D-MPX came as significantly upgraded performance. receive and resolve two -channel sound, a surprise to the Sydney audience, it Moves to delay a possible format using the German system. carried a welcome implication: have the strong support of Alternatively, if you're considering the consumers would be spared the change Wilhelmus (Bill) Andriessen, Chief purchase of a new TV receiver, this year, speculation as to which was the better of Audio/Video Applications Engineer of give some thought to whether it should the two systems. In the PAL format, at BASF in Germany, who was in Australia be equipped for stereo sound, least, they were virtually identical. recently on a fact finding and lecture with further provision to connect it to an It now appears that the provision of hifi tour. external hifi audio system. stereo sound and a continuing reduction maintains strongly that a new 8mm in the size and weight of portable He or similar system should be based equipment has imparted a whole new - - a from which the binder has image to the established formats. VCR on tape been eliminated and the magnetic layer production in Japan is again on the in vacuum. increase and speculation about an applied by direct deposition It effectively reducestape thickness and has the potential for much improve high frequency response - both very O desirable objectives. a His company had taken up a licence Matsushita to manufacture their from VT -111111111111 1111191 "Angrom" vacuum deposited tape but ai l r 1' 1IIiu1111 11101111 mi that was only half the story; they face a (National Panasonic) real problem of ,learning how to mass produce it at a mass production price! For the present, the established product Domestic video & audio: holds huge economic advantage for together at last! consumers. And that brings us to the common ground between video and audio. The Stereo sound for TV whole point of video or TV stereo is lost stations: this year if the signal it fed into a makeshift According to Bill Andriessen, the amplifer and loudspeaker system. So, emergence of VHS and Beta hifi unless you can afford and accommodate coincides with a trend which his two separate quality systems, the logical Company has observed: a rising interest course is to bring the equipment in musically based video programming together so that video and TV sound, had increased awareness of video AM and FM radio, tape and discs can all sound quality. While medium quality be fed through the main hifi system, as mono may suffice for ordinary movies, it required. is far from adequate for musical features To date, with only medium quality t ...... 1 .r or, for that matter, for space-age themes sound available from video and and sound effects. TV, - broadcast the incentive to do this VHS and Beta hifi can now meet that has not been very strong but that Released to the Japanese market in May need and, for many, the humble video position will change, this year, with high '83, the National NV-800 offered hifi- cassette will take on a whole new sound quality stereo sound becoming available stereo audio to the same performance during the course of 1984. from both sources. Viewer expectation of high quality specifications as had previously been Stereo for AM radio: claimed exclusive to the Beta format. stereo sound must pose an urgent 1984 should see hifi sound selling freely challenge to television stations to "get also planned for 1984 in both formats. with it". From the outset, TV stations Nor should we overlook AM radio,

32 ELECTRONICS Australia, January, 1984 -4

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mentioned above. It, too, has offered While the compact audio cassette cannot match the sound quality from the newest only medium quality mono sound, to sound sources, it is unrivalled in terms of versatility. It will be around for quite a while date, partly because the system yet, providing both home and car entertainment. developed that way, and partly because of the cost-cutting design of virtually all time -shift television viewing. Candidates duration sound -only recording, in high AM radio tuners. During the past year, included people interested in classical quality stereo, from any available however, AM radio stations in Australia and pop concerts, operas, recorded source; this by merely pushing the have been quietly experimenting with music sessions and so on. appropriate buttons! And, just as easily, compatible mono/stereo transmission Some of the material, he said, might the entire program can be played back systems, and AM stereo is another even find its way on to compact cassette into the system, with hardly any loss of almost certain innovation during 1984. for further replay in the family car - an quality, and subject to all the program There is one complication in that, in observation that might be less heinous in search facilities which characterise a top - Australia, as in the USA, failure to settle West Germany than elsewhere, because range VCR. on a single standard will result in radio of their surcharge on tape. As if to emphasise that there is more to stations having to choose between four these An obvious technical barrier to long - observations than mere possible technical methods - all duration time -shift radio listening has speculation, a report that has just producing much the same result but all reached me from Japanconfirms been the lack of a convenient, long - that the differing in detail. Fortunately, receiver running, high quality recording system, trend has emerged there already. It designers have been suggests able to come up preferably with timer facilities. At best, a that hifi VCRs, sold in that with ICs (integrated circuits) capable of compact cassette deck can record country, are being used for between 30% decoding all four systems, although with continuously for two hours, but only and 40% of the time recording hifi-stereo some penalty in terms both of provided that it has auto reverse audio! complication and cost. facilities, and will operate reliably with a State-of-the-art However, the challenge facing the C-120 cassette. A large, open -reel tape designers home recording of new up-market AM tuners recorder is a possibility but scarcely one and receivers will not just be a provision that would meet the criteria: While Beta and VHS hifi will offer to the for decoding AM stereo transmissions. "convenient, high quality". enthusiast a means of recording video or They should logically provide wide band other to a very is Now, with the arrival of VHS and Beta sound high standard, it tuning circuits as well, to let through the not the end of the line for the home hifi VCRs, consumers have access to a higher modulation frequencies which are recordist in unit with accurate self -timing facilities terms of ultimate quality. currently lopped off by conventional AM, Already listed in the catalogues are and the ability to make a very high tuning systems. It will be interesting to "consumer" products which aliow audio quality stereo sound recording with a observe the response of the Japanese signals to be recorded on video style running time of up to four hours at suppliers to this new challenge during - equipment in present. One can confidently predict but digital form - the year ahead. marginally than FM - that the second generation of hifi VCRs better again the In terms of overall sound quality, AM based video hifi - in the VHS format at least - will systems. stereo will probably not match up to its Sony have an adaptor, type PCM-701ES combine hifi audio with half -speed tape FM counterpart but, for the many who (reviewed last month), which can travel to provide eight hours of hifi accept find pleasure in AM programming, the a stereo audio signal and transpose it stereo on a single cassette! availability of stereo sound, and into a pulse code modulated signal, able .hopefully better sound, can only be a While hifi video recorders would to be recorded by most Beta format normally fed an bonus. It's certainly something to keep in be with external video VCRs. In playback mode, the adaptor signal (to which lock), is mind if you're planning to invest in a they this not a converts the recording back into analog prerequisite. They can in free - new, up-market receiver or tuner. operate stereo, at a quality level which running mode in and, fact, an impressive approaches that of compact discs. "Time shifting" for recording of Bach's'Toccata and Fugue" National have a similar unit, the SV-100 played at sound broadcasting the Sony/Sanyo/Toshiba Digital Audio Processor, for use with presentation in Sydney, was a sound - Getting back to high quality, video - VHS format VCRs. National also list the only dúbbing on a Sony Beta hifi VCR, style sound recording, BASF's Bill SV-P100, which incorporates a VHS with its own audio Andriessen made another rather in-built level control recording mechanism becoming, in and metering. intriguing observation at a symposium effect, a self-contained digital audio for technical writers held in Launceston, With just such a VCR, grouped and recorder. Tasmania. There seemed to be a' interconnected with other video and When we first encountered these units, growing interest, he said, in time -shift audio components, it becomes we tended to question their relevance to radio listening - the sonic equivalent of technically possible to make a long - anything but a professional recording

ELECTRONICS Australia, January, 1984 33 A whole new era ~- in Audio/Video - situation, because nó ordinary enthusiast would have had access to program material calling for that order of technical specification. But, in the context of 1984, with thé emphasis on SONY' audio/video systems and on quality, they may well attract the attention of at least the big -budget enthusiasts. The Compact Cassette - good for a while yet! FM and digital recording may seem to be rather elevated company for an analog tape system that started out in the '60s as a means of recording speech `` or, at best, music of (very) medium. quality. Since then, with a lot of help NR, improvements in from Dolby and The Sony compact disc player. Production figures of compact discs and players alike a time, it performance, won a decibel at are climbing steeply and will undoubtedly provide the standard source of top quality has gained acceptance as a "respectable" pre-recorded music for many years to come. system: handy for everyday use, excellent for'hi-car sound, and disuse. It's much too handy a facility to list, followed by Nippon -Columbia and sufficiently close to full-scale hifi to pose invite that fate! Matsushita. The figure for Europe is to engineer and about one-half million per month, a continuing challenge The Compact Disc enthusiast alike. - headed up by Polygram in West Looking ahead, the compact cassette it's here to stay! Germany. Domestic production in the system would appeár to be in no danger Despite initial production problems USA is still in its very early stages. of being eclipsed during 1984 although, and a barrage of criticism from those CD player production has also tended equally, there is little chance of it being who distrusted the digital system in any to concentrate in Japan, with about 30 further upgraded, beyond the odd form, the compact disc system is rapidly base models currently in production by marginal refinement. We say this, winning acceptance - and is doing so in the major manufacturers. Most of these despite talk about halving tape speed the audiophile area from which most of are sold in Japan and elsewhere under and doubling the playing time; of the criticism originated. their own names and model numbers, evolving new tape formulations to gain The trend has been evident over the but quite a few others are for the OEM an all-round improvement in past year to anyone who has watched market and end up with cosmetic performance; of resorting to digital the reviews in the English "Gramophone" changes and the nameplates of other recording and/or other methods of magazine and noted the rising established hardware suppliers. tape. proportion of compact discs. What's scanning the Significantly, the production of CD, more, most of the reviews have ranged Most such speculation commonly players in Japan has overtaken that of favourable to enthusiastic, leads to oné conclusion: a significantly from quality phono decks, indicating that the with the older technology upgraded system, with higher compared - majority of quality-aware buyers are which has a rather staid information packing density (probably this in a journal deciding to equip or re-eqúip for and studious image. digital) should really be designed around compact, rather than conventional discs. a new generation of tape (eg vacuum According to the latest figures from most deposited) of selected width (not Japan, more than 80% of all "classics" It is also noteworthy that have even two necessarily 3.8mm) and housed in a type albums pressed in that country to manufacturers one or cassette that will afford better protection the end of last year were in the CD models selling for Y150,000 or less in roughly to $1000 (eg like a video cassette). One school of format, with conventional "black" Japan, which translates thought favours something about the audiophile albums falling to less than or less RRP in Australia. For a player any size of the present compact cassette; 20%. The figures relate to total Japanese which, technically, can outperform another, strongly supported in Japan, production, both for the domestic phono deck evér contrived, or any tape favours the smallest possible format, market and on an OEM basis for other player for that matter, $800 is not will not be the more like the present minicassette. major labels around the world. excessive - and that All of these options rule out any In the jazz field, again with a significant lower limit for long. thought of compatibility with the present audiophile following, the proportion of No, we're not súggesting that you compact cassette and would'cómmit the CD releases has reached about 40%. In should dump your phono deck and your world audio industry to the same kind of the "pops" area, CD albums represent collection of black discs into the garbage negotiations which ultimately produced only about one-third of that percentage, bin. We'll probably be playing stereo LPs the compact disc. We understand that a with the cheaper conventional albums for the next five or 10 years, if only for study group has already been set up to still dominating the pop market. the treasure house of sound they consider the whole matter but how Japan now has the - potential to contain. But, as of 1984, they'll begin to protracted and how successful their produce about 70% of the world's supply take on the aura of a vintage car: effort may be remains to be seen. of compact discs, with a monthly something to polish, and admire and In the meantime, the compact cassette production capacity of about one -and -a - remember, but a little too primitive for is unlikely to be abandoned or to fall into quarter million discs. CBS/Sony heads the everyday use!

34 ELECTRONICS Australia, January, 1984 The change to TU - 750 excellence ~_110"011i e in sound... - . TU - 710

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Denon, the name associated worldwide with ultimate combinations of performance, reliability professional audio equipment has available in and cosmetic styling. Australia their range of high quality integrated See the exciting range of amplifiers, tuners stereo amplifiers, tuners and cassette tape decks, and cassette decks at your Denon dealer now, incorporating the most advanced features at you'll find their prices rather exciting as well. competitive prices. High performance amplifiers, analog and digital tuners, and cassette tape decks featuring both Dolby "B" & "C", are the result of 30 years of research and technology, offering you the ENON Professional Audio Brand.

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ELECTRONICS Australia, January, 1984 35 ,,1111.4.0 , ° °

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. : ti::f. : -. r'y4''' ': IN .. .. . a.-u..n. n...... Y n.:i_{:::::: Vi:::tii r':- 144Atiia Mons er Amplifier Most audiophiles at one stage or another probably dream about The amplifier is a Perreaux 5150B, designed by Peter Perreaux and owning a truly high power amplifier. While price alone probably produced by his New Zealand based keeps this a dream for most, for the well-heeled Perreaux has company "Perreaux Sound". The company now exports to the American as one of the best amplifiers ever. produced what must surely rank and European markets as well as Boasting a power output of 800W per channel coupled with Australia and is currently establishing an extremely low distortion, the Perreaux 5150B should suit the most excellent reputation as a producer of high quality audio amplifiers. discerning (or hard of hearing!) audiophile. One afternoon, a week or two after the This review was prompted by a visit to the amplifier is capable of delivering phone calls, a representative from IREECON, a trade show and conference 500W per channel into eight ohms and Perreaux called around and left almost held at the Royal Agricultural Society nearly a kilowatt per channel into four 30 kilos of 5150B amplifier in our care. showground in Sydney a few months ohms! The sheer size of the amplifier created ago. As we wandered through the This amplifier we just had to review! much comment from our normally blase stands, we came across one of the To cut a long story short, after several staff, as did the internal construction largest power amplifiers we had ever phone calls to Melbourne a loan of the when the lid was removed. seen. What's more, the lid of the amplifier was arranged and we sat back Internally, the 5150B probably has the amplifier was off and we were able to to await its arrival. We were told by best mechanical construction we have poke and pry to our heart's content. Melbourne that the amplifier was ever seen in an amplifier. It is literally Inside the case was a huge power actually a preproduction prototype and "built like a. tank". The front panel is a transformer, eight very large filter was the only one in Australia, having custom designed aluminium extrusion capacitors (10,0001.¿F 160VW), 24 output been completed just in time for the 6mm thick, which fits a standard 19 -inch devices, and virtually nothing else! It IREECON show. Consequently, the rack. Below the aluminium extrusion, took a second look to find the rest of the amplifier was very much in demand for and recessed slightly from it, is an open amplifier circuitry, which seemed demonstrations to interested people and mesh grille which allows the circulation ridiculously simple for such a large so our loan period would have to be of cooling air into the lower section of amplifier. kept short. the amplifier. A talk with the sales representatives at the stand confirmed that the amplifier used MOSFET output devices and that

I01111~.:.

,reaux

DUAL Alapti,*-

38 ELECTRONICS Australia, January, 1984 ro erreaux The front panel has a silver -satin finish MONSTER AMPLIFIER - Perreaux set off by a small panel which carries the 51.508 is huge, features amplifier name and Perreaux logo, a heavily -finned heatsinks to pushbutton on -off power switch and an dissipate heat generated by on -off indicating LED. Two large massive output power. aluminium carrying handles are attached to the front panel in standard rack - mount style. Each side of the amplifier is constructed from three large sections of heavily finned heatsink. The heatsink is held together by a "T" shaped bracket which is also used to mount the output transistors. Total surface area of the héatsinks is a massive 21,000 sq cm.

The upper portion of the rear panel is S constructed from an open mesh while .c, portion is from the lower constructed nw ..=I 2mm thick aluminium sheet. Mounted . i.

on the aluminium section are five fuses: A four of these are 10A fuses used in the amplifier supply rails while the fifth fuse is a 240V, 10A line fuse. Also mounted is RCA on the back panel a gold plated 4i1 socket and two huge 110A (yes 110A!) gold plated speaker terminals. The speaker terminals are a binding post type which accepts spade terminals and can be screwed up very tightly, giving an excellent electrical connection. The power transformer, which is the heaviest single component in the 5150B, The 5150B is not only the largest is mounted via special channelling on amplifier we have ever tested, but was the rear of the front panel. This shifts the also one of the hardest to test. The centre of gravity towards the front of the immense power output which the graph is typical of a normal power amplifier and allows it to be rack amplifier is capable of required the amplifier and shows the usual gradual mounted without danger of the case setting up of new dummy load resistors rise in distortion at lower power levels as distorting or the rack screws being since our usual dummy load resistors just hum and noise forms a greater portion of subjected to excessive pressure. The could not handle the power. We were the output content. printed circuit board assembly runs able to produce suitable 4 and 80 Output power at the onset of clipping nearly the full width of the case and is dummy loads using a length of spiral was measured as 640W with one supported on all sides by brackets. wound resistance wire on a ceramic channel driven and 570W with both In addition, the eight large filter former. Since each load had to be able channels driven into 80. Into 40 the capacitors are supported by a wide to dissipate at least 1kW, water cooling, output powers were measured as aluminium bar which runs down the in the form of a ten litre bucket of water, 1080W and 920W respectively. centre of the printed circuit board. was needed. We measured the dynamic headroom The two large circular objects seen Using this set-up, we found that if the of the amplifier as per the IHF-A-202 attached to the heatsinks in the amplifier was run at maximum power standard which calls for 20 cycles of high photographs are actually inductors used output for about 15 minutes, it was level tone to be applied to the amplifier. in the load stabilising networks. possible to actually boil the bucket of every 0.5s. The dynamic headroom of Physically, these are the largest output water! the amplifier is then the ratio (in inductors we have ever seen, and consist Referring to the distortion versus decibels) of the maximum tone bust of 13 turns of heavy gauge insulated wire frequency graph, it can be seen that for power output before clipping to the wound on a 32mm diameter perspex the 80 case, distortion was below the nominal maximum power output of the tube. residual of the analyser for all amplifier. Most amplifier wiring is run on the frequencies under 3kHz. Above 3kHz, Using the tone burst test signal, the underside of the printed circuit board the distortion rose gradually to a 5150B was able to produce a 228V p -p and is bundled into one large wiring maximum of .018% at 20kHz. At sine wave across both 4 and 80 loads loom running down the centre of the frequencies of 10kHz and greater, before visible clipping of the waveform printed circuit board. distortion components were mainly occurred. This corresponds to dynamic Overall dimensions of the 5150B are second harmonic, while third harmonic headrooms of 2.1dB into 80 (ref 500W) 606 x 483 x 257mm (D x W x H) with an components dominated below 10kHz. and 3.1dB into 40 (ref 800W). The lower approximate weight of 30kg. The distortion versus power output headroom figure for 80 is due to the

ELECTRONICS Australia, January, 1984 39 Wt11.A1100100110110) r ;r1 . ! e : J I: : á. t - .- I N .rt w...... _ _ I:. I r

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Interior construction is simple and rugged. Design features 12 output transistors per channel.

bear in mind that the amplifier we are Monster Amplifier from Perreaux testing is a preproduction model and these criticisms may not apply to the amplifier being voltage limited rather -98.5dB and at 10kHz -79.5bB. Input production model. than current limited. Perreaux quote a sensitivity, or the input signal required to Our first criticism is the lack of output headroom figure of 2.5dB for the 5150B produce rated output power from the power indication. We would prefer to which is slightly larger than our figure amplifier, was measured as 1.5VRMS for see some form of power meters fitted to but they used a music source rather than both the left and right channels, in line the amplifier so there is no chance of a tone burst source with the Perreaux specification. and this probably accidently overdriving loudspeakers. accounts for the difference. The unweighted signal-to-noise ratio While we realise many loudspeakers can The frequency response of the 5150B was found to be 102.5dB for the left be safely overdriven to several times was virtually ruler flat being only -0.2dB channel and 104.5dB for the right their nominal rating on program peaks, at 20Hz and -0.1dB at 20kHz for channel, both of these measurements some cannot, and "winding the wick up" 500W RMS output. Between these limits being referred to rated output of 500W. on an amplifier of this size when using deviations from 0dB were much less and These figures comfortably meet under -rated speakers carried with it the the 5150B easily met its specification of Perreaux's specification of 100dB below possibility of loudpseaker destruction. ±0.25dB from 20Hz to 20kHz. Wider rated output, 20Hz to 20kHz frequency response limits of ±0.5dB unweighted. We would also like to see some form from 10Hz to 50kHz are given in the Damping factor was measured as 95 at of warning included on the back panel to specifications and we were able to verify 1kHz, giving an output impedance of advise people of the electric shock the amplifier response at 10Hz as being around 84m0. The damping factor at hazard presented by the speaker -0.5dB but we did not wish to overheat 50Hz was 92 which is good but a long terminals. Although 80VRMS may not the resistor in the load stabilising way from the "greater than 500" sound like smuch, it is potentially network so we did not check the specification given by Perreaux. dangerous. response at 50kHz. There were one or two points about Our last critical comments have to do Crosstalk was found to be below the the amplifier which we feel deserve with the power supply. This uses two noise floor at 100Hz while at 1kHz it was some criticism. However, readers should 10,000µF capacitors with a fuse between

Manufacturer's specs Test results Output power (81 load) 500W RMS per channel 570W RMS per channel (49 load) 800W RMS per channel 920W RMS per channel Dynamic headroom 2 5dB using a music source 2 1 dB using a tone burst source Output voltage swing 220V peak to peak 228V peak to peak Distortion Less than 0.035% from 0.25 See graphs to 500W RMS into 89 load Frequency response, 20Hz to 20kHz ±0.25dB 20Hz to 20kHz +0, -0.2dB 10Hz to 50kHz ±0.5dB 10Hz -0.5dB, 50kHz not checked (see text) Channel separation 60dB minimum, 20Hz to 20kHz 100Hz Below amplifier noise floor 1kHz 98.5dB 10kHz 79.5dB Hum and Noise 100db below rated output, 104.5dB below rated output, 20Hz to 20kHz unweighted DC to 80kHz unweighted

Damping factory Over 500 from 10Hz to 1kHz 50Hz 91.9 1kHz 94.7

Input sensitivity 1 5V RMS for rated output at 1kHz . . 1.5V RMS for rated output at 1 kHZ

40 ELECTRONICS Australia, January. 1984 in each supply rail. If the fuse them .04 blows for some reason during amplifier PERREAUX 51508 operation, the first capacitor is left charged (at around 130V) while the second capacitor is discharged by the amplifier circuitry. When the new fuse is .03 screwed into place, the discharged capacitor is suddenly connected across the charged capacitor via the fuse and the result is a flash and bang like a small firecracker, and a second blown fuse. We believe that Perreaux has included a bleed resistor across the first 10,000µF capacitor to discharge it after the amplifier is turned off, however no information has been placed on the rear panel to indicate how long you have to wait before it is safe to insert the new C. LOAD. 101: fuse. This problem has obviously caught I I SU LOAD. 1kH: a number of people (including us) since all four amplifier supply rail fuses 10 100 1k 2k showed signs of damage and subsequent OUTPUT POWER (WATTS) repair on the metal ends. These graphs plot the total harmonic distortion (THD) as a function of output power Our overall impressions of the (above) and as a function of frequency (below). THD is generally less than .01%. Perreaux 5150B amplifier are very .04 favourable. The simplicity of the circuit PERREAUX 51508 together with the superb mechanical construction, extremely low distortion and huge output power, combine to make this amplifier one of the best we have ever tested. The few criticisms we .03 have of the 5150B are quite minor and will probably be remedied on the production versions anyway. If you are intending to purchase an amplifier in the top end of the market, we highly .02 recommend you give the Perreaux 51506 an audition. The amplifier has a five year warranty and carries a recommended retail price .01 of $3875. Further information on the Perreaux 51508 amplifier is available 40 LOAD, 800W from Perreaux Australia, 6 University Place, North Clayton, Vic. 3168, or from 80 LOAD, 500W

hi-fi dealers stocking Perreaux 0 10k 20k equipment. (JS) 20 100 HERTZ tk SECOND

1 MAKE YOUR HI-FI SOUND UNLIKE HI-FI Simply add Audlosound loudspeakers (from our range of six) to your existing system and your music suddenly sounds Incredibly real without harshness or colouration. ( Audlosound Laboratories design and manufacture high quality loudspeakers which offer transparency of sound quality rarely obtained from most speakers, 1 - particularly those forming part of an imported package system where cost counts most. Shown is the Minuet 8033 ($590 pr.) selected by the ABC who have over 80 of these fine loudspeakers around Australia. This speaker also handles the new compact discs without any modification. For an informative demonstration contact:

148 Pitt Road, audiosound North Curl Curl. NSW 2099

LABORATORIES Telephone : (02) 938 2068 Contractors .to the Australian Broadcasting Corporation.

ELECTRONICS Australia, January, 1984 41 ÍoO

,.r ' low cost hi fi That's right a 3 - WAY HI FI speaker kit from only S19.9811 Each kit contains a massive 10" (250mm) woofer, cone midrange and DOME tweeter), You also get, at no extra charge, the special cross over capacitors) The system is rated at approximately 20 watts RMS so it is ideal as an economical but reasonably powerful main HI FI unit or as a second system for another room or outdoors. Amazing Each 3way kit comes with a recommended enclosure design which you Woofer not to can build yourself easily) same scale as You would normally pay well over S60 for the equivalent from major other Value kit speaker suppliers so this is an outstanding bargain. Sensitivity of components system 93d13/1 m/1 watt. Cat. AK3700 HURRY LIMITED STOCKS and they are made in JAPANII 3-WAY SYSTEM NOW $19.95 $24.95 a set A FURTHER 2 SETS FOR STEREO (6 spkrs) NOW soit ONLY $39.95 $34.95

MASSIVE SCOOP PURCHASE! MANUFACTURERS DISTRESS STOCKI Jaycar has purchased a quantity of genuine Brand New MOTOROLA Brand MHW710.1 UHF Power Amplifier modules. These units are designed for Industrial and commercial FM transmitters) The unit (pictured) is í rugged, tuned train of'RF Power Amplifier transistors featuring thinfilm gold metallization, laser trimmed Nichrome resistors and MOS capacitors. The MHW-710.1 bolts to any flat metal surface to assist heat dissipation. UHf AMPLIFIER SPECIFICATIONS: - RF POWER OUT @ 12.5V 13 WATTS - RF POWER OUT @ 15V 17 WATTSII (BOTH OF THE ABOVE RATINGS ARE LIKELY TO BE EXCEEDED AS MOTOROLA'S POWER RATING CLAIMS ARE CONSERVATIVE) - 19.4 dB (Min) POWER GAIN. TYPICAL DRIVE LEVEL TO FULL POWER 90 150mW - FREQUENCY BAND 400 440MHz. Will work to 450MHz and therefore covers the AUSTRALIAN UHF AMATEUR BANDII SENSATION CIRCUIT DIAGRAM INCLUDED Each MHW-710.1 comes individually pecked with full manufacturers data. A manufacturers recon, mended circuit is included (only a few external components required), as well as a PCB pattern for the circuit This component makes an ideal base for a "Home Brew" UHF Linear Amplifier, GREAT for UHF Mobllel SERVICEMEN The MEOW -710.1 has been used extensively in Australian Manufactured UHF Mobile 2way radios. If you own or service a UHF radio that uses this pert, now is your chance to grab a spare at an unrepeatable prkel The MHW-710.1 sells for AS68 plus tax in the USA. QUANTITIES STRICTLY LIMITED To be fair to all, we have limited this offer to 2 per person. Jaycar's Scoop offers are so successful that usually hundreds miss out Even at 2 per customer we will probably run out quickly. Be early to avoid disappointment)) STAGGERING VALUEI ONLY 539.9511 -Cat. ZK.8882 NORMALLY $39.95 THIS MONTH $34.95 10 UP PRICE FOR CLUBS - $29.95 EACH

12" WOOFER THIS PRICE CAN NEVER BE REPEATED BO WATT HANDLING - ABOUT 40W R.M.S. $°"`Y EUROPEAN QUALITY code - MADE IN DENMARK er FREO. RESPONSE 35 - 4000Hz This it a very popular game that is well known under RESONANCE FREQUENCY 35H: another name) The Codemaster measures 140(1) x B5(w) Cat. CE.2130 x 251dimm, looks similar to a pocket calculator end tuna off a 9V cell. The yea of the game is to come uywith the 496 hidden code in the minimum of moves. 411to SOLD WELL FOR Cat XM.7015 $29.75 10 UP s é./;77./ IN NOVEMBER $4.50 ea . . V «? JANUARY ONLY ONCE SOLD FOR S24.601 $19.95 SAVE 33% o i TOP QUALITY CENTRONICS "MAGNAVOX" LINED PLUG PRINTER QUALITY PAPER 36 WAY 8" WOOFER FEED t Cat PP,2420 TRACTOR $14.95 At last at an affordable price POPULAR MODEL 8J

80 .r 8 ohm 8" widerange TO SUm SUPER . j40mM WIDE 9.5 - Power handling 12W RMS XE.126033 ., 380MM 47 e50 - Freq. Resp. 55 - 7000Hz ` X0262) j Cat. CE -2333 $7.50 each SHEETS i 2000 / PER BOX Quality 8750 at low Speakers g price 42 ELECTRONICS Australia, January, 1984 o

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PPOFF Pt'tb9.1tON Oc'EJN1t%ºLSONSJ SprNirlia GN¿pE eN OGt Sw ndleaders in Auto Electronics Each kit is complete down to the last nut & bolt All fittings included) ,1(274 . r SX-2000. UK's largest selling electronic ignition! "Reactive Discharge" , system - NOT CD! - with great reliability. Cat KJ-6650 Spur/Who SX2000 BELOW $200 A Reactive Discharge System CO MP UER combines all features of the SX500 plus. Reactive Discharge electronics combining ad the COMPLETELY Bulll advantages of both Inductive and Capacitive AND TESTED - Discharge for maximum spark performance NOT A nlTII Valuea ue Goes the most thorough combustion of air/fuel ratios especially current lean mixture emission controlled engines. sísy Voted 'Accessory of the Year' and the best as tested :4yy by Popular Motoring Magazine 7 Patented clip-to -coil fitting r%É, Systems Function Light as well as Static Timing Light a The ultimate brand leading contact -breaker triggered system THIS MONTH outstanding 9 TX -2002. Breakerless'ignitionl Full fitting kit to convert 90% of all cars) All contactiess hardware supplied. No drilling or tapping. You can easily convert - and even use your points to work the TX -20021 `119 Cat KJ-6652 JigsFEATURES SAVE $20!! SparñlrllIE TX2002 - INSTANT FUEL CONSUMPTION IN LITRES/100KM* AND SEND SAE A MPG!! (MOST OTHERS HAVE Reactive Discharge System - with unique auxiliary ONLY ONE OF THE ABOVE) FOR Circuit. Combines all features of the TX1002 Plus: JUST SWITCH FROM ONE TO THE OTHER AS YOU DRIVE MORE Reactive Discharge electronics combining all the advantages 01 DATA Inductive and Capacitive Discharge for maximum spars ALONG. performance - INSTANT SPEED, TIME AND OTHER FUEL DATA. Givesthe most thorough combustion of wr/fuel ratios Cat especia0y Current lean mixture emission controlled engines - VISUAL AND AUDIBLE EXCESS SPEED ALARM. XC2010 Unigue 3 -way change -over Switch incorporating an auxiliare back up circuit.' ELECTRONIC/OFF/AUXILIARN Robust die-cast cue fully resistant to moisture and heat The ultimata system - REACTIVE DISCHARGE - CONTACTLESS OR CONTACT TRIGGERED - AUXILIARY BACK UP CIRCUIT - TX APPLICATIONS THE ALL SINGING CLIP- TO -COIL FITTING - FOUR CONNECTION£ ONLY - No separate Ii.rn9 Ed ieirvned, ALL PARTS IN ONE BOX TO FIT OVER 500 APPLICATIONS all pans in one box. to lit more ALL DANCING than 500 vehicles Tx -i W[ sii,.ey Tx2002 mom Isr MULTIMETER e..uááa ui ni e P w w.n .ai Scoop Purchase of quality 'KAISE" Japan- amazing ese 3T5 digit LCD digital multimeter. T}i - Manual range override (Normally aura Spartirita ME 79 - ranging) -A must. Zero adjust button. An Inductive Discharge System Calibrates value - meter if you change test probes be Can operated utilising 'Hall Effect' "open iriggernead, or existing contad - Virtually circuit" input impedance breakers Magnificent Extended dwell Inductive Discharge for - clear LCD readout nwennum spark erficienne - Most significant digit flashes It out of Three position switch only - range . Static Tlmmg Lignt - Tone beeper for status identification Systems Function Light -+/-1103V DC. 600V AC Patented clip-to -cod fitting $ - Resistance & Current ranges Robust die-cast case (AC & DC) fully waterproof. - Lo ohms range for checking semis Amin Protected from the hostile environment of - banana plug leads on industry the engirt. compan merit - standard 19mm centres - High current shunt available - Fuse protected. Spare fuse provided I - inside case. Sparl4rila AT. 80 Cat. OM 1525

ann.. camw.. e.as..nm.d. c., swan,arn.- .1.1. ten r..w.inw x.kri ;AT SO i. a Fasa péó`uwiniiése.óúñioé lóreiHi DIGITAL wweió'Kia..onE.eeAla.wrrrsiNx.,ii *Owen. s5995 InULtITESTER katti ° AT -B0 SPECIAL NOTE...

Jaycar will not be knowingly undersold FOR GOODS OF THE SAME QUALITY. If you find that a competitor is cheaper, get all the face and tell usl If you are right we will match OR LOWER his price) Please understand that we cannot match the price of goods that are NOT the sane quality as ours.

I ncorporati ng NUMBER 1 FOR KITS ELECTRONIC AGENCIES POST AND PACKING CHARGES Jaycar 55 - 59.99 (51.50) 510 - 524.99 (53.20) 525 $49.99 Mail Order SYDNEY SHOWROOMS - ($4.50) S50 - 599.99 (56.50) 5100 - 5198 ($8.00) Over 5199 (5101 By 117 YORK STREET - PHONE: (021 264 6688 and (021 267 1614 "Free INSURANCE for Road & Registered Post over 5200" All heavy or bulky items 20kg.) sent Comet TELEX: 72293 (over Road Freight S12.00 anywhere CARLINGFORD in Australia. Cnr. CARLINGFORD & PENNANT HILLS ROAD - PHONE: 1021 872 4444 SHOP HOURS CARLINGFORD. CONCORD & HURSTVILLE Mon - Fri 9am - 5.30pm: Sat - 9am - 12pm: Thurs night 8.30pm CONCORD SHOP HOURS SYDNEY 115 - 117 PARRAMATTA ROAD - PHONE: 745 3077 BANKCARDBAN (02) Mon - Fri 8.30am - 5,30pm. Sat - 8.30arn - 12pm: Thurs night 8.30pm r HURSTV ILLE 121 FOREST ROAD - PHONE: 1021 570 7000 MAIL ORDERS AND CORRESPONDENCE:, P.O. Box 185, Concord. 2137 Via Your Phone!

ELECTRONICS Australia, January, 1984 43 Infrared Remote Control mDimmer theaforu by JOHN CLARKE & GREG SWAIN Fancy infrared remote control for your Touch - lamp Dimmer? This circuit can turn the lights on and off or dim them to any desired level, all at the touch of a single button.

In many instances, the location of light switched on and off or dimmed to suit switches is far from practical. In most the mood without moving from your rooms, for example, switches are chair. located néar the doorway. This is the In the bedroom, the same advantages obvious position for switching the light apply. You can now turn the light on and on and off upon entry or exit, but if you off or dim from the convenience of your are seated in the room the doorway bed. You will not need to walk around in location is usually not convenient. With the dark again. Just press the single this infrared control, the lights can be button on the hand-held transmitter and the light will turn on or off. Or by holding S1 the button down, you can dim (or brighten) the light to any desired level from full brightness to completely off. You don't even have to point the transmitter directly at the wall -mounted receiver/dimmer unit. The circuit is so effective that wall reflections of the transmitted infrared light are quite sufficient to activate the receiver. Naturally, the user still has full control over the Touch -lamp Dimmer in the usual way - that is, by touching it. The Touch -lamp Dimmer was originally described ín April 1983 and consists of unit will switch lights on and off. an HPM blank grid with a metallic cover Alternatively, touching the plate for plate. Mounted on the back of the grid longer periods initiates up/down iECB plate is a small printed circuit board dimming. (PCB) which contains the dimmer All these features are duplicated by the circuitry. By lightly touching the front Remote Dimmer, although you actually REMOTE DIMMER TRANSMITTER 21PCI- plate for between 50 and 400ms, the have to go to the trouble of pressing the

1006 10011 SW+ ACTIVE 3306F 10k 05 33k -1IH t BC557 D3 220k 16 6 3 4 100k e 1BV +2.4V 1w D4 loo 1 .001 COMP VCO 04 BPw50 16VW 03 SIGNAL IN OUT Bcsa7 A 01 1.9V BC549 II'-4 ICI C 2815484 IN 10 100k B C 4046 DEMODULATOR D 02 47 DI 10 41: BC549 PHASE E ---- 160W+ 10V VCO 16VW 680pF COMP 1W JS 7+0.6V OUT IN +10 12 Is 8 13 9 220011W 3.36 4706 100k J 1M 100kí RI R2 REMOTE 1II-- 1M 1M 6B0pF D2 1k 3.3k 1N4004 lk 022 -9.4V 96 1-11w LAMP 250VAC Ono En VIEWED FROM BELOW - REMOTE DIMMER RECEIVER 2IPCI-

44 ELECTRONICS Australia, January, 1984 r'

The remote control receiver PCB and the dimmer PCB are both mounted on the back of the switch plate. At left is the hand-held infrared transmitter.

switches power to the transmitter when Even so, the peak current is more than lamp control is required. the battery could supply on its own. For REMOTE When the switch button is pressed, the this reason, a large storage capacitor transmitter emits pulses of infrared light (2200µF electrolytic) has been included DIMMER and these are detected by the infrared to supply the peak current. The battery detector diode in the receiver. The signal keeps the capacitor topped up with is then amplified and fed to a phase lock' charge while the capacitor supplies the Short touch - loop (PLL) IC which immediately locks LED current pulses. on/off onto. the incoming frequency. The PLL The average current drawn by the Long touch - drives a transistor output stage which, in circuit is around 60mA giving a battery dimming turn, activates the dimmer circuit via the life of several months under normal use. existing "Remote" input on the dimmer Note that two infrared LEDs have been PCB terminal strip. used in the transmitter to double the Since the receiver PCB carries its own infrared light output. These LEDs are Electronics Australia power supply, components, only two either Philips CQY89A or Siemens LD271 further connections are required types. They are similar in appearance to between the receiver and dimmer PCBs. the more usual red LEDs except that they switch on the hand-held transmitter unit. These are "Active" and "Lamp". As are encased in a very dark blue Even so, the burden should not be too before, these connections are made encapsulation which is transparent to great! directly to the terminal strip on the infrared light. Externally, the appearance of the dimmer PCB. Touch -lamp dimmer with remote Let's now turn to the receiver circuit. It can be down into four sections: control is identical to the original except broken an amplifier, a lock loop (PLL), an for a small hole in the touch plate (see How it works phase stage, and a power supply. photo). This is to admit infrared light The remote dimmer transmitter output driver pulses generated by the transmitter to an consists of a 555 timer IC, several The infrared light generated by the infrared photodiode in the receiver resistors, two capacitors, a 9V battery, transmitter LEDs is received by an circuit. The receiver PCB and the existing two infrared LEDs and a BD140 driver infrared photodiode (D4). This is a Philips Touch -lamp Dimmer PCB are stacked transistor. The 555 IC is connected in the BPW50 type which incorporates an together, with the receiver PCB mounted astable mode, operates at 20kHz, and integral infrared filter and which is directly on the grid plate. provides a 2.30 negative going pulse at specially designed to match the infrared The transmitter consists of a small box its pin 3 output. This signal switches on LEDs. containing the necessary circuitry and a the BD140 transistor which supplies 1A The photodiode has its cathode 9V battery. Two infrared LEDs protrude current pulses to the two infrared LEDs. connected to the positive supply rail via through the end of the box and a small The 2.29 resistor limits the current to an RC decoupling network consisting of momentary contact switch on the lid prevent damage to the LEDs. a 100k12 resistor and a 10µF capacitor.

ELECTRONICS Australia, January, 1984 45 Remote Dimmer

This ensures that the supply line does 411 not modulate the anode voltage of the diode, with subsequent amplification in the following stages. In operation, the photodiode acts as a current source such that it generates a current proportional r to the incident 3 -tl- infrared light. This current + n signal is converted to a voltage by the 100k9 resistor at the anode. The signal from the photodiode is fed to the input of Q1, an N -channel FET connected as a source follower. This stage has a gain of about 0.5 and drives a bandpass filter consisting of transistors Q2 and Q3. The centre frequency of the filter is about 20kHz while the bandwidth is wide enough to allow for some mistuning of the transmitter frequency. This view shows the receiver PCB mounted on the switch plate. Note the metal shield At the same time, it effectively covering the sensitive input circuitry (see text and diagrams). eliminates interference from other sources such as fluorescent and 10 FS100k EO--sCC incandescant lights. 00k Q2 and Q3 form a two stage inverting 100k .00f 1k.{At K REMOTE amplifier. Both St KrDI / we, transistors operate as II ;: 680P Br rJ 2.2.291.41Ot (1:11S common emitter ' stages, with the ` + ACTIVE second stage providing two separate K 220011E outputs: one from the junction of the it9V LAMP two 3.3k2 resistors { and the second from BATTERY 4700 Q3's collector. The first output has a relatively low impedance and is used to Install all parts exactly as shown on these drive the filter and to provide DC overlay diagrams. Figs. 1 & 2 show the 0 details the feedback via the 470k[ resistor to bias for metal shield. SHIELDED Q2. The filter components are the two 680pF capacitors and the 470k(2 bias resistor which, together with the output impedance of the previous FET stage, determine the centre frequency and Q of the filter. Phase lock loop The amplified signal at the collector of Q3 is AC -coupled to the signal input of the 4046 PLL (IC1). This input has a sensitivity of about 200mV when AC - coupled which means that it can lock on to signals at or above this level. Inside the PLL is a voltage controlled 1.01.... oscillator (VCO), a phase comparator, a x filter and a demodulator. The frequency r of the VCO can be varied over a certain range by applying a DC control voltage to the VCO input (pin 9). R1 and R2, . together with the 330pF capacitor (pins V 6 and 7), set the range of the VCO from 10kHz to 20kHz. What happens is that the phase comparator compares the signal frequency with the VCO and produces a control voltage to bring the VCO into lock (ie, to the same frequency). If there is no signal input, the VCO simply free runs at its minimum frequency (10kHz) View inside the hand-held transmitter. Use a small piece of foam insulation to prevent and the filtered output from the phase shorts between the battery and the PCB.

46 ELECTRONICS Australia, January, 1984 Geoff Wood is well known on the retail electronics scene in Sydney. Now he's opened his own store in a brand new location and he's stocking the broadest range of prime quality National Semiconductor product ever stocked at a retail level in Sydney. The specials listed will be available only while stocks last - so get your Orders i,n early. Many other specials for personal shoppers only. GEOFF WOOD ELECTRONICS PTY LTD Incorporated in N.S.W. 656A Darling St, Rozelle 2039 (One door from National Street) Tel: 810 6845 8.30 to 5 Monday to Friday, 8.30 to 12 Sat. Mail Orders add $3.00 to cover postal charges. E bankcicrc1 Next day delivery in Sydney add $5.00. $10.00 minimum All prices INCLUDE sales tax. Tax exemption certificates accepted it line value exceeds $10.00.

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NPR GENERAL PURPOSE TO -18 TO -92 7 VOLT WEGATIVE REGULATOR DECADE COUNTER .SYNJIRONOl18 CLEAR MEMORY TRANSISTOR 7.00 2N2904 0.40 LM78L12ACZ 0.35 MM74C175 0.95 NO NEEDS TRANSISTORS, APPARENTLY PHA GENERAL FLAME TO -18 YO -92 12 VOLT POSITIVE REGULATOR MM2114N 1.95 QUAD D FLIP FLOP 1024 14 RAN EVERYOE. THIS BOCA INCLUDES 211,PN, 2N3019 0.69 LM78L15ACZ 0.35 MHBOC97 0.70 NJ IP 'FIT S ALL IN OPE HARDY VOLUTE. NPR PEDIUI ROER 10-5 T0-92 17 VOLT POSITIVE REGULATOR MM2114N-055 0.95 THREE STATE NE I BUFFER 1024 14 RAN 0-75 DEG C VOLT REGUL. 9.25 2N3053 0.64 NPR POWER LM79L05ACZ 0.70 NOT REALLY A DATA BOOM ,MOWS A DESIGN MED11A1 TO -5 TO -92 5 VOLT WHAT IVE REGULATOR MM2716Q-1 10.49 POPULAR 310,x. IN PROP FEET ON POWER SUPPLY CORSIDERAT IONS. 2N4032 0.64 LM79L12ACZ 0.70 INTERFACE PARTS HEAT 0110110 ANO POWER DISSIPATION. NPN rE011R1 POW R TO -7 TO-92 12 VOLT PEGAT IvE REWLA TOR DS1488 0.92 LOGIC WINNERS 2N4360 0.60 MOST ~ION RS232 DRIVER. VERY LM79L15ACZ 0.70 WE DM7406N 1.20 POPA AR FIT T0-92 11 VOLT NEGATIVE REGULATOR AD/DA DS1489 0.92 30V IRVEITER ALMOST 1MP065I&E 2N5485 0.70 RC4195 0.50 QUITE USEFUL WITH D61461 TO GET. ADD3501 12.00 WET/AF TO -92 3 3/4 DIGIT PION/MI NUS 116 AT 1COR4, TOGA !WO OVA LEO OUTPUT DM7407N 1.20 DAC0808 2N5656 0.92 SUPER REG L1Mlr(o QUANTITIES ONLY BE QUICK 2.25 MPI ~II TD-124 CAPACITOR SCOOP R SIT DTOA LM396K 20.99 DM7438N 1.20 2N6707 0.49 SIEMANS 10.00/C 10 NIP ADJUSTABLE RE GLATOR IE NON QUAD BUFFER -A DE AUTO NPN MEDIUM POWER TO-92 &US .047 272 VOLT MAW LIMITED QUART IVIES IN 5TOOK. HIGH POWER SPECIALS PN3563 0.18 74LS HARD TO GET? PM001 32.50 LITTLE TRIMMERS NEC701 POA NPR NF To -92 NOT AT GEOEE 90 R00 00.1.700 .MP DIODE 1.000 ELECTRONICS AT 104/AP TRMISEOPPEP TO SUIT 391 3326H-1 0.30 PN3643 0.18 P11(101.11.101 YOURS TODAY. IDEAL FOR 50 SUPPLY. BONNE SINGLE TURN 71( TRITER BTY99-600R 50.00 NAN PEDIUN POWER TO -92 000 VO,7.100 NAP SCR LINT TED WUANTITIES ONLY TIP3055 1.20 NPN POWER TO -220

specialising in electronic components for the professional and hobbyist. Remote PARTS LIST 1 BPW50 infrared photodiode 1 PCB, 83rc12a, 47x72mm 1 PCB, 83rc12b, 52x39mm CAPACITORS case, 83x54x29mm pigtail electrolytic Dimmer 1 plastic utility 1 2200µF/16VW 1 Scotchcal front panel, 50x79mm 1 100µF/16VW PC electrolytic 1 momentary contact pushbutton 1 47µF/16VW PC electrolytic comparator is low. This means that the switch 1 10µF/16VW PC electrolytic demodulator output (pin 10) will also be 1 9V battery, Eveready 216 or 1 0.22µF 250VAC low, since it follows the voltage on the 1 .01µF metallised polyester VCO input, and that transistor Q4 will be equivalent 1 battery clip 2 .001µF metallised polyester off. mains terminal strip When the signal frequency is higher 1 3 -way 2 680pí ceramic 1 100mm length of 1mm-diameter 1 than the VCO, the phase comparator 330pF ceramic tinned copper wire increases the duty cycle of its pulsed RESISTORS (Y44 W, 5% unless noted) output with pin 13 remaining high for a SEMICONDUCTORS 3x1MS2, 1x470k[2, 1x2201(12, greater proportion of time. This output is 1 555 timer IC 5x 100k1/, 1x68k12,1x33kf2,1x10k1, filtered by a 1M52 resistor and a .01µF 1 4046 phase lock loop IC 3x3.3k12, 1 x1 k12, 1 x1 k(2 1W, 1x220(2 capacitor to produce a smooth control 1 8D140 PNP transistor 1W, 2x10012, 1x2.252 pin 9. Thus, when a 20kHz 2 BC549 NPN transistors voltage on MISCELLANEOUS pin 9 and the 1 BC547 NPN transistor signal is received, Clear plastic film, scrap tinplate, (pin 10) both go 1 BC557 PNP transistor demodulator output cardboard, solder, epoxy resin, Q4. 1 2N5484 N -channel FET high, turning on transistor solder etc. Q4, in turn, drives transistor Q5 which 1 18V 1W zener diode PLUS turns on and pulls the Remote input of 1 10V 1W zener diode required to build the the dimmer circuit high via a 2201 1 1N4004 diode All the parts (see April resistor. Zener diode D3 protects Q5 2 CQY89A or LD271 infrared Touch -lamp Dimmer from excessive collector -emitter diodes 1983) voltages. Note that for incoming frequencies is on a PCB coded 83rc12a much below 20kHz, the demodulator (ie, 10V minus the voltage across D2). constructed measuring 47x72mm. This PCB output will not go high enough to trigger The 0.22µF capacitor acts as an and mounts onto the rear of the Q4. IC1 thus provides an additional impedance of 15162 at 50Hz and thus directly grid plate. The transmitter circuitry measure of filtering against frequencies limits the current to an average of 16mA HPM on a PCB coded 83rc12b below 20kHz. when the full mains voltage is applied is constructed and measuring 52x39mm. This PCB, Power for the circuit is derjved from across the Lamp and Active terminals (ie, When the lamp along with the 9V battery, is housed in a the mains via a 0.22µF current limiting at minimum brightness). small plastic utility case measuring capacitor and a 1k2 resistor. By using the is at full brightness, the first 35 degrees is still 54x29x83mm (WxDxH). capacitor reactance to limit the current (or 2ms) of each mains cycle (see EA, Begin construction by assembling the rather than a large value resistor, heat available for the power supply average voltage transmitter PCB according to the parts dissipation is kept to a minimum. Diodes April 1983). The lower is still sufficient for zener overlay diagram. The main point to D1 and D2 operate in conjunction with thus developed watch here is that all polarised parts are the 0.22µF capacitor as a "charge pump" regulation and filtering. correctly oriented. These include the for the 47µF capacitor, while D1 2200µF capacitor, the LEDs, the performs the additional function of Construction transistor and the IC. The two infrared limiting the supply voltage to about 9.4V The Remote Dimmer receiver circuitry

REMOTE 1M VSS OUTPUT

SENSOR 5 01 INPUT SC141D 240VAC 1. IC1 S576Á 6 470k 4.7M 1W SYNC 251V AC .I. INPUT VDD 4.7M 7 1206 1 W II 100u/111 250V II 300W MAX. 0.22 1 1k1W 250V AC TOUCH NO WA II PLATE o

AtI J l0 2/PC/- - TOUCH -LAMP DIMMER A2

48 ELECTRONICS Australia, January, 1984 . drill the switch mounting hole. You will also have to drill two 5mm holes at one end of the case to accept the infrared BEND DOWN LEDs. These holes should be positioned PCB 15 so that the will sit comfortably on "HEY" When your In the market for a car you head for the bottom of the case. The two infrared "Auto Alley" - LEDs should protrude by about 5mm to For you, the electronic enthusiast, tradesmen, hobbyist or just an electronic Nut, we've ensure that their active areas are created "Silicon Alley" - better known as York exposed. Street. So no matter what you need in ----- 35 CARDBOARD INSULATOR The wiring electronics, drop your soldering iron and come 46 23 46 to the switch and battery on in. (OOP'S Switch it OFF first) TINPLATE can now be completed according to the BASE SHIELD wiring diagram and the case assembled. SIZCLAIR SPECTRUM We used foam insulation to isolate the HOWE COf 1PUTER battery from the PCB and to hold these BEND DOWN items in place when the lid is screwed down. iiiiYiii Attention can now be turned to the ..... BEND DOWN remote dimmer receiver. As before, take 1111r.i.i.17T care to ensure that all polarised Sinclair ZX Spectrum -16K RAM 199.00 components are inserted correctly and Sinclair ZX Spectrum -48K RAM 399.00 46 note that most of the resistors are Sinclair ZX Printer 169.00 TINPLATE mounted end on. Note also that TOP SHIELD SOFTWARE DIMENSIONS IN MILLIMETRES Fig. 1 alternative pad spacings have been s' Games 1 to 6 19.50 provided for the 0.22µF capacitor. These Biorythms 22.50 are suit Space Raider 19:50 to the two different types of Chess 25.00 TOUCH -LAMP DIMMER PCB (83pc3a) capacitor commonly available. Raiders 19.50 Imm WIRE Planetoids 19.50 The three-way insulated terminal block Flight Simulation 25.00 is secured to the PCB using short lengths Back Gammon 19.50 TINPLATE TOP SHIELD Vu -Foe 27.50 of 1mm diameter wire soldered to the Vu-Calc 25.00 pads allocated for the Vu -3D 25.00 SOLDER SHIELD TO PC copper terminals. Scrabble 44.00 STAKES AT CORNERS The photodiode (D4) is mounted on Hungry Horace 19.50 OF PCB Adventure A - Planet 01 Death 22.50 the copper side of the PCB. Bend the Adventure B - Inca CurSe 22.50 BASE SHIELD Adventure C Ship of Doom 22.50 SPRING FOR BPW50 - leads at right angles adjacent to the Adventure D Espionage Island 22.50 TOUCHPLATE - diode body, then insert the diode so that Revers' 25.00 REMOTE CONTROL RECEIVER PCB (e3rc12a) Fig. 2 The Hobbit 44.00 it lies flat on the PCB with the act;, e area Collectors Pack 22.50 Club Record Controller 22.50 facing outwards. In practice, this means Horace Goes Skiing 19.50 LEDs are mounted at extremities of that lie Horace 8 The Spiders 19.50 the the diode body should under Embassy Assault 19.50 their leads and bent at right angles after transistor Ql. Cyrus - is - Chess 27.70 ZX - Forth 44.00 soldering. Shielding is required for the amplifier Small Business Account 39.0D Note that the body of the .001µF portion of the circuit and Fig.1 shows the capacitor must be mounted flat against dimensions required. Tinplate is the ideal LOOKING TO BUY A the PCB. This is to allow the battery to fit material and this can be obtained MULTIMETER? between the PCB and the lid of the case cheaply by cutting up a tin can that during final assembly. previously contained Fido's dinner. The TWO NEW MODELS FROM With the PCB 5x10mm cutout in the assembled, attach the base shield PARAMATERS Scotchcal label to the lid of the case and provides clearance for the photodiode. A cardboard insulator is required MODEL 7040 between the base shield and the PCB, Low Cost 3'/º Digits 0.1% and this can be attached to the metal Basic DCV Accuracy 28 Ranges TOUCH PLATE 2000 Hour Battery Life Hi -Lo using double -sided tape or epoxy Volt Resistance Tests Overload . Protected on All Ranges Current adhesive. This done, the two shield 41- Ranges to 10 Amps. 4.7M }+ pieces can be attached to the receiver $99.00 REMOTE PCB by soldering them to earthed PC. D1 }03 stakes (see Fig. 2). Note that the shield ,i10DEL601 ACTIVE could touch the leads of some resistors Low Cost 3'/1 Digits 0.1% f - this is acceptable provided the leads Ii and 0.25% Basic DCV Accuracy ,{ 470k 28 Ranges 2000 and 200 LAMP are connected to earth. You will have no Hour Battery Lite Hi-Lv Volt t {80k problem if you solder in the resistors Resistance Tests Overload e'ti ' \ Protected on All Ranges Current o ACTIVE exactly as shown in the parts overlay 100,* 3 Ranges to 10 Amps Rugged El %OVIAC construction. $69.00 .001 _ 04I' 47uF. diagram. Check the assembly carefully to ensure These are just a few of the many 100's of up-to- Left and above: reprinted from the adequate clearance between the shield date Electronic items on display at: April 1983 issue, these two diagrams and the photodiode leads. depict the circuit and PCB parts overlay for the Touch -lamp Dimmer. As shown Final assembly in the photos and Fig. 2, the dimmer You are now ready for the final PCB is stacked on top of the remote assembly. First, remove the dimmer PCB LIMITED receiver PCB. Refer to April 1983 for a from the grid plate by prising it gently DAVID REID ELECTRONICS full circuit description. with a screwdriver blade (be careful 127 York Street, Sydney, 2000 or Telephone (02) 267 1385 though, otherwise . the PCB could

ELECTRONICS Australia, January, 1984 49 Remote Dimmer shatter). This done, remove the contact spring and the three short lengths of REMOTE tinned copper wire from the Remote, Active and Lamp terminals (but not from DIMMER the Active terminal adjacent to the 0.114F 250VAC (capacitor). Fig. 2 shows the stacking arrangement for the two PCBs. As shown, the Short touch - touchplate contact spring is soldered to onloff a pad on the receiver PCB and a 23mm Long touch length of 1mm tinned copper wire run to - the contact (or 'touch) pad on the dimming dimmer PCB. Connections between the two terminal blocks are made using three 20mm lengths of 1mm tinned copper wire - one each soldered to the Electronics Australia Remote, Active and Lamp terminals of Here are actual size artworks for the the dimmer PCB. PCBs and the transmitter front panel. Solder in each 20mm length of wire so We estimate that the current cost that it extends 8mm above the surface of of parts for this project is the dimmer PCB, then insert the wires approximately into the terminal blocks and tighten the Provided that you use 1mm screws. $26 ' wire for 83rc12b' tinned copper all connections, This includes sales tax but does no further support will be required not include the cost of the Touch - the two s between boards. lamp Dimmer. The PCB assembly is centrally located f on the rear of the plastic grid plate. You into will have to mark out and cut a hole in metallic cover plate is clipped the grid plate for the photodiode, position, the plastic window is together with a matching hole in the sandwiched between the two. metal faceplate. Make sure that these The PCB assembly can now be affixed holes are large enough to admit light to with epoxy resin to the rear of the grid the full active area of the photodiode. It plate and the touchplate checked for fit a standard wall box and, just in case will not be necessary to drill a new hole correct isolation. Set your multimeter to you're wondering, the remote switching in the grid plate for the contact spring, the highest range and check that the option can be added as before. since the existing hole can be re -used. resistance between the touch plate and Finally, some readers may be Because the photodiode leads are at the active terminal oh the dimmer PCB is wondering if the remote control option mains potential, a rectangular sheet of about 10M12. If the circuit fails this test, can be fitted to the Touch -lamp Timer stiff, clear plastic should be fitted over check carefully for faults and rectify any described in August 1983. The simple the cutout for the photodiode (the problem before proceeding. answer is that while the two circuits are plastic used for shirt box lids is ideal). Installation of the completed unit is electrically compatible, they are This should be glued directly to the exactly the same as for the original physically incompatible. Undoubtedly, it plastic grid plate using a suitable Touch -lamp Dimmer circuit in the April is possible to overcome this problem but adhesive (eg, "Airfix') so that, when the 1983 issue. The new unit is designed to that is up to the individual.

AN INTRODUCTION TO DIGITAL ELECTRONICS Electronic equipment now plays an important role in almost every field of human 1I endeavour. And every day, more and more electronic equipment is "going digital". Even professional engineers and technicians find it hard to keep pace. In order to 1111111111 understand new developments, you need a good grounding in basic digital concepts, and An Introduction to Digital Electronics can give you that grounding. Tens of thousands of people - engineers, technicians, students and hobbyists - have used the previous editions of this book to find out what the digital revolution is all about. The fourth edition has been updated and expanded, to make it of even greater value.

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ELECTRONICS Australia, January, 1984 51 "N fi n 3 projects í .. "Here it is - the one everyone's been asking us `. for! A completely new volume of Fun Way into Electronics, leading on from the incredibly successful Volumes 1 & 2. This one has 10 exciting new projects, all based on integrated circuits - making it an ideal choice for anyone who's worked their way through the introductory books and kits. Join the many thousands of hobbyists, school students and club members who have learned Electronics the Fun Way. It could lead to an exciting new career!"

nm - just like a real Nocturnalis Stridulus Gryllidae (Cricket to . you). Cat K-2663 « %Ow $995 o u Y/ + MINI STEREO 4 AMPLIFIER Just the shot for turning your n game'. headphones - Easy to build, type 'Walkie' .. yet its novel stereo or FM radio - design gives realistic `flick of the into a full speaker LIGHT AND ,wrist' operation. system for your Cat K-2661 $995 bedroom! Or you 1 SOUND can use it as an Not just one project, but many! You amplifier for can .use it to produce all sorts of «- a loudhailer sound effects, to flash lights, as a or mini PA strobe, as a continuity tester, system. even a Morse Code Cat K-2667 practice set. $895 Simple and easy to build, too. Cat K-2665 5 MINDER Another one that's really many projects in one - this time for the car or boat. Alights on' or 'door not shut' warning, or a burglar $795 CRICKET deterrent flasher. It's almost as good as a real alarm! Cat K-2660 Put this project in a quiet, dark QTWOU; place, and it starts chirping; turn on I Put yourself in the winner's circle the light or make I with,this space-age electronic a noise, and it version of Australia's 'national stops! Infuriating Note the boxes shown are not supplied in the basic kits. Tne front panels are in the Fun Way 3 book. -ten exciting n tegrated Circuits!"

MINI COLOUR MINI LI'L POKEY 2,6 ORGAN 8 10 SYNTH Just like the one -arm bandits at the Incredible -a r;l club! A barrel of fun to play, but real music you won't risk losing your shirt synthesiser, with or your pocket decay, frequency M money. A satis- doubling and . fying project - lnnor yfl ya . halving, tremolo V wiew .. . yourfriendswill r`-_ Its really unique be most feature is that impressed! YOU become Just like the light show at the local Cat K-2662 ' »L41 3 the note disco. Connects to your radio or generator! cassette recorder, adds an extra I POkyt' Whistle, hum dimension to your musical or sing and entertainment. Easy to build and 99"s , see what can be battery operated, so it's interesting safe. Cat K-2664 , effects you produce! >i Cat K-2669 ,-.,. BINARY I COMBINATION BINGO TIME LOCK SWITCH 9995 Use it as a combination lock for Please note: all protects shown with optional cases. The labels Shown are all printed in the Fun a burglar alarm, or as a Way 3 book. challenging `brain teaser' party game. Just try cracking the CO1/onol combination without setting off the 7 alarm! It's really good. Cat K-2666 of A lot harder to play than it looks 42ss -just try it and see! Tests your reaction time, r also helps you learn binary numbers. Four /

levels of skill. Easy to . build, battery operated for safety. Cat K-2668 óm:°ro.1o'oa. Zoo Z9on.,ny 'No uUoo,.,,Oro,. bLocj 99ss 'I go And the book .. l/l - " Dick Smith's Fun Way Into Electronics, ONLY . C/RrS Volume 3: over 100 pages with easy -to- a follow instructions for all these projects, 95 0 plus handy information every hobbyist gis needs. Cat B-2610 DICK SIiITH /L' Electronics See page 98 for full address details. A682/1 rin er con ro er

Following this are two 4518 dual be a tedious Watering large areas of market gardens can decade counters (IC2-IC3) which divide business where limited water pressure restricts the the 5.5Hz 10,000 times, giving a negative going pulse at pin 14 (IC3) once every number of sprinklers to one or two at the time. The half hour. IC4 is a Johnson counter and is automatic switching system described here enables a wired to divide the half hour pulses at its pin 13 by 2, 4, 5 or 6 to give a negative large number of sprinklers to be switched on in going pulse every 1, 2, 2.5 or 3 hours at pins 2, 7, 10, 1 respectively. succession. It could also be used for watering lawns. and Switch S1b selects whichever one of these pins is required for a particular This project came about due to my 2.5 or 3 hours, depending where S1 is set. time, while S1a is connected so each interest and work in electronics, and The second board corisists of 10 output switch position is one stage of the through working on my father's potato transistors (500mA output current) which Johnson counter ahead of Sib. For farm. Several paddocks are out of reach are sequentially switched each time a example, in position 1HR, a negative of water pumped from our dam. pulse is received from the timer board. going pulse is delivered to pin 13 of IC6 Therefore, we must resort to using water Each board is designed to take a after one hour. Simultaneously, position from the street main which, at the best 16 -way edge connector with 0.1in 1HR of S1a receives a positive going of times, will drive only one sprinkler. spacing, such as is available from Dick 'pulse which is fed to the reset pins of For years these paddocks have been Smith under catalogue number P2816. IC2, IC3 and IC4, and this resets all the watered in this fashion, which meant These are used to provide counters tó zero. Therefore, pin 13 (106) every two or three hours, someone interconnection between the two that, will receive another negative going pulse had to go and shift the sprinkler. That'is, boards, and also from each board to only after a further one .hour. The 12k9 until I came up with the idea of a various external components. In the case resistor is used to keep the reset line portable sprinkler controller. of the timer board these include down to the zero line during counting. After some looking around, I found an switches S1 and S2, and, for the control electric solenoid valve ideal for the job board, the solenoid valves, the two Switch S2, a pushbutton type, is used and, after a lot of head scratching, came batteries, S3 etc. to reset all counting to zero when a new watering cycle- is commenced. up with a circuit for controlling the taps. I built my project on a moveable How it works When S2 is depressed, S2á sends a is platform, which I will describe later. The The timebase for the timer an LM555 positive pulse to the reset lines of 1C2, biggest benefit is that I am now able to timer (IC1) operating at 5.5Hz. The 12k9 IC3 and 1C4. Section S2b functions in water during the night, when there is timing resistor shown should give this conjunction with 105, a 4011 quad maximum pressure and minimum time approximately, but may need to be 2 -input NAND gate. Two of these are evaporation. modified to cope with any spread of the used as a flipflop, as shown, to send a The circuit is built on two printed 1012F capacitor. Provision is made on the pulse to pin 13 (106) when S2 is circuit boards. One is a timer board printed circuit board to add or substitute depressed. The flipflop is used to avoid which gives an output pulse every 1, 2, a trimpot if the timing is critical. contact bounce.

) __-_l 1/;-

THE TIMER board (above) delivers an output pulse every 1, 2, 2.5 or 3 hours, depending on the setting of Si. Note that the final version differs slightly from the prototype. THE SPRINKLER CONTROLLER board (right) controls the 10 water sprinkler solenoids. Both PCBs plug into 16 -way edge connectors and are easily removed from the case for servicing.

54 ELECTRONICS Australia, January, 1984 orvesea earens

ontrols up to 10 outputs °° L j °ELL°

, pa v't / ^'wo.0 4 # ,i.. -r- tré-J r.rar. , - r, +" r r` ...... ic..=, +r- '. ` 5 1 i ' yr ,

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When 52 is depressed the flipflop The author's unit was mounted on a output changes to 1. When it is released Richdel solenoid mobile platform which also carries the the output goes to zero. This negative The solenoids, the hoses and the 12V car pulse will move the output along one Richdel 204LG solenoid is made battery. stage, and activate the first solenoid. by Richdel Inc, Carson City, Nevada, USA. The up to 1000 pascals, with a flow rate The output board is made up of several units used by the of author were 160 litres per minute, and are sections. Basically, it switches the 10 purchased from relatively Donald Dons cheap. Another attractión was low output solenoids sequentially each time and Son Pty Ltd, the Baxter Rd, North power requirements (5.7VA at 24V AC), pin 13 (IC6) receives a negative going Geelong, Victoria 3215. Phone thus avoiding the use of relays pulse from the timer board. The heart of (052) 78 8100.. The to switch price paid was heavy currents. this board is another 4017 Johnson $29.50 each. It should also be At 24V AC the pull -in is counter (IC6). This counter can be pulsed possible to purchase current the 480mA, which then drops to by either a positive or negative going solenoids from other large about plumbing houses, 200mA due to inductive reactance. But pulse. In this case, pin 14 is held at the supply so check suppliers in your when used on DC (I used a 12V positive rail which enables pin 13 to be town or city first. car battery for my supply) the resistance triggered by the negative pulses from the is 30 ohms which, at 12V DC, should timer board. Pin 15 is held at zero to draw energised at any time. These can be 400mA. In disable the reset function. practice (due to some losses) fitted by connecting the commoned it draws only 320mA, which, in From IC6 the 10 outputs are some connected cathodes of the LEDs to the common circumstances, will not operate to 10 two -stage amplifiers. The the first stage solenoid rail via a 68052 resistor. The armature. consists of two LM3086 integrated anode of each LED is then connected to To overcome this problem, I designed circuits, each of which contains five low its respective active solenoid line. a circuit which connects a 6V Big Jim power NPN transistors. The second stage A problem that I encountered in my battery in series with the coils and 12V consists of 10 2N4356 transistors which prototype was the pull -in current of the supply for two seconds. This gives, after are capable of 500mA collector current. water solenoid coils. The water losses, 15V across the at a Diodes D3 -D12 coil, current are used to suppress any I solenoids used were Richdel R204LG of 500mA, which is more than enough to back EMF when the coils of the valves which use a coil designed for 24V AC. In pull in the armature. are turned off. spite of the coil problem, I wanted to use The circuit is quite simple. As each A useful optional addition to the circuit these, as they were ideal mechanically output turns on, a negative going pulse is is a LED indicator connected across each for my project. They can be plumbed fed to the trigger input of 555 timer IC9 solenoid to indicate which one is into 25mm piping, can control pressures via a .0151.1F capacitor. IC9 is configured ELECTRONICS Australia, January, 1984 55 "". - _...... ,....' - 09 07 E C E02....- C E:c..._.I 1k . I -{tOk}- - IYI *-I tOk -r 10k 1-

©+ 7SyF CBE'pBE ' 08 106 C B E 011

8 12011 SW 012 C r E 0131

16 IArAllllf i

r";1 9 1 6 248 ° z TO 0< WATER VALVE w SOLENOIDS ó 3

Sprinkler controller for vegetable gardens providing sufficient holding current to Here as a monostable with a period of period, Q12 turns off and disconnects keep the solenoid on. about two seconds. When its pin 3 the 6V supply. The current through the output goes high, Q11 and Q12 turn on solenoid coil now drops to around One problem with the above circuit and connect the 6V supply in series with 70mA due to the 12012 5W resistor in concerns the optional LED indicators. the output transistor selected, its series with diode D13. This scheme When Q12 is off, only about 2V is associated solenoid and the 12V supply. significantly increases the discharge developed across the energised At the end of the two second delay cycle time of the 12V car battery while solenoid, insufficient to illuminate the LED effectively. To overcome this problem, I connected a NIO spring loaded switch (53) between the emitter and collector of Q12. This switches the 6V supply in to give adequate LED brightness. Delete 53 if the LEDs are not used.

As a point of interest, if the circuit is not required to cycle through all the 10 outputs, connect the reset function (pin 15) of IC6 to the stage following the one you require. For example, if only six stages are required, stage 7 (pin 5, IC6) should be connected to the reset pin. Now, after the last stage required turns off (stage 6), stage 7 goes positive and resets the 4017 back to stage 1.

Left: the Richdel 204LG water sprinkler solenoid. Other solenoids with similar specifications may also be suitable. 1k 1006' 100k' 6 12 114 16 17-10 16 +12V 10 CPO ICI IC2 IC3 14 13 IC4 12k 1 S2b 555 4518 4518 W 4017 6 f6 2 J119 15 7 15 7 15 4 5 o 1' I' I9 +12V

101+ 14 TANTI 6

2><1N4004 DI 02 4011 \S2a O2MR o S1a 02.5HR -0 Stb O 12kS Q3HR +12V

8 4 1206

2.2k 16 IC9 L--ir 1206;1 +12V 555 6 14 16 CPO .015 j2 13 IC6 II CP1 4017

15 o jt5 4

10k1 10k 10k1 1061 106 10k1 10kí 10k 10k1 1 kf

2 6 9

3 13 0 10 IC7 IC8 LM3086 LM3086

14 11 1 11 14

lk lk tk 1k1 1kt 1k

B 10:2N4356 01 02 03 4 05 1 06 07 08 09 010 +12V A E

D4 05 D6 07 I DB 09 D11 012 DÓ_ O1 10a1N4004

WATER VALVE SOLENOIDS 6V 1N4004 D13 E) E BC10B 011 C VIEWED FROM El I la MJE340 BELOW C 012 E S31 1200 B SW SPRINKLER CONTROL 3IMSI-

(Note: besides using this controller for waterproof junction box No. 265/7. S1 is the bottom with a thin piece of 'libber. controlling water valves, it could also be mounted inside the box. For adjustment, The holes above the rubber are filled used to control relays, which in turn may a screwdriver slot was cut in the shaft with liquid silastic. Therefore, by pushing control anything you desire.) and access is provided through a 20mm the silastic layer, S2 and S3 can be fitting with no entry of water. The four time periods I used were 1, 2, electrical plain -to -screwed conduit operated 2.5 and 3 hours, but by changing the mounted in the side of the box. The LEDs are mounted in appropriate point along the two dual decade This opening is sealed with a plug size holes drilled in the lid, the LEDs counters at which pin 13 (IC4) picks up made from a short piece of 20mm being sealed into the holes with silastic. the signal, or by changing the number of conduit, filled with silastic. To make an The terminal strip used is a Belling Lee times IC4 multiplies the signal at pin 13 adjustment, the plug is unscrewed, the unit which has terminal screws at the top" (IC4), a time period of up to five hours shaft rotated with a screwdriver, and the and solder posts at the back. Holes were can be achieved. plug re-inserted to prevent the entry of drilled to pass these solder posts water. Switches S2 and S3 are mounted through the side of the box. Silastic is Construction on a small piece of aluminium. This is used from the inside as a seal against Because of the exposure to water from then secured to the underside of the lid. moisture. the sprinklers, the electronic hardware A large hole was cut in the lid above In my case the sprinkler controller had was built into a "Clipsal" electrical each switch and these holes sealed from to be portable. I achieved this by ELECTRONICS Australia, January, 1984 57 Sprinkler controller for vegetable gardens building a frame 0.9m x 1.8m mounted stages to program the starting time of the night, with minimum evaporation on four 68cm bicycle wheels. The top of stage one. For example, if set up for and maximum water pressure. this frame carries the six sprinklers. To night watering, the watering time for The way I have set up my controller is support the hoses, seven pieces of each sprinkler is two hours. Therefore, quite elaborate but, by using the same 25mm square tubing were welded on the sprinklers could be set up at the ideas, a simpler set-up could be used. the sides of the frame. The six valves are convenient time of 2pm and the Alternatively, the circuit could be used mounted on the underside. The -car controller set at stage 8. As a result, as a sequential timer to control electrical battery used for the 12V DC supply is stage one would turn on at 6pm and all equipment requiring long time intervals mounted on the underside also. the watering will be carried out during for each stage. Setting up the sprinklers is simple. Wheel the controller to the area to be watered, uncoil the main supply hose and connect to the nearest tap. From the top of the platform pick-up each of the six sprinklers, uncoil their hoses, and place the sprinklers in an even pattern around the controller. The controller is now ready to turn on. First select how si -r long each sprinkler is to stay on using S1, 4 ,ñ turn on the main water supply, and then \\1 cycle through the stages with S2 to sprinkler one. The sprinklers will now automatically water in turn for the time 41> selected by S1. , -

In my case I needed to use only six of the 10 stages. I used the remaining four

PARTS LIST

1 PCB, code 84 ws 1 a, 123 x 80mm 7 1 PCB, code 84ws1 b, 161 x 128mm 2 16 -way edge connectors (0.1 -inch) 1 case to suit (see text) od- 1 12 -way terminal strip (see text)

1 2 -pole 4 -position rotary switch . 1 DPDT momentary contact switch

1 single pole momentary contact `P switch 1110111.1:11 10 Richdel 204LG (or similar) water These two views show the physical construction of the "Sprinkler 'Controller". The sprinkler solenoids prototype was built into a "Clipsal" waterproof junction box. SEMICONDUCTORS A" 2 555 timers 2 4518 dual decade counters 2 4017 Johnson counters 1 4011 quad NAND gate 2 LM3086 transistor arrays 10 2N4356 transistors 1 BC108 transistor 1 MJE340 transistor 13 1N4004 diodes 10 LEDs (optional, see text.) CAPACITORS 1 15µF/16VW tantalum 1 10µF/25VW tantalum 1 .015µF metallised polyester 1 .01µF metallised polyester RESISTORS (YW, 5% unless stated) 1 x 120k2, 2 x 100k12, 1 x 22kit, 2 x121(, 10x101(12,1x2.2k12,12x 7 1k12, 10 x 6809 (optional for LEDs), 1 x 1209 5W `, MISCELLANEOUS Hook-up wire, machine screws and rirw nuts, spacers, solder etc. ti 58 ELECTRONICS Australia, January, 1984 moftware for the Sup -T.-80- Computer ú"-r»-.71,11.2.-.7:;

The programs are: POKER MACHINE SIMULATION: This simulated poker machine keeps a record of your winnings and unlike the real \ ones, you can set a limit on your losses. CALENDAR CALCULATOR: This program displays or prints out a calendar for any year of the 20th century - O and keeps track of paydays! OTHELLO GAME: O The game of Othello, or Reversi, is played on an 8 X 8 grid with counters of two 0 colours. This one has a "help" option. INVESTMENT ANALYSIS: How much money can you make investing for a fixed term of years at current interest rates? Find out with this program. GUESSING GAME: Is it animal, vegetable or mineral, a place, name or a car? Play against your friends, trying to guess the object. a -O /00 LIST AND SORT: 0. -es This program lets you compile lists of up to 500 items, arrange them in alphabetical order and save them on Cassette tape. OO FRED THE SHRINK: Got a problem? Perhaps Fred can help. Talk things over with your Computer - it may give you a new perspective on life! SIMPLE MATHS DRILL: A great one for the kids - or to test your m It right 0-0 own arithmetic skills. tells you the ea --1, answer, with comments it you goof. ... LOTTO NUMBER SELECTOR: We don't guarantee you'll win your fortune, but this program makes picking Lotto numbers easy. It's fun to use, too. TRIANGLE SOLUTIONS: SPRINKLER CONTROLLER 84ws1b Computerised trigonometry at your service. 11 you think you know all the angles, try this program for size. MORTAR ATTACK GAME: Match wits with the computer! See how long you can hold out in this challenging game of mortar bombardment. CAVES & MONSTERS: Go adventuring in the maze. You must fight monsters and find the treasure, but be careful - the monsters get tougher as you go. AMATEUR O CODE TUTORIAL: If you're thinking of going for your amateur radio licence, or just want to find out what all those "O" codes mean, try this. DIRECTORY FOR CARAVAN PARKS: Owners of caravan parks can keep track of who's where with this program. It can be adapted to other applications too. SUPER -POKEY GAME: Another poker machine game, but this one has graphics. For the budget conscious, you can set an upper limit on your stake TATTSLOTTO NUMBERS: For those south of the borderwe present a program to srlect numbers for Tattslotto entries. Good luck

Note: this book is exclusive to, and 16 available only from, Electronics IC1 Australia, 57 Regent St, Chippendale 84wsla 2008, PRICE: $4 or by mall order from 'MODULE Electronics Australia, PO Box 163, Chippendale, NSW 2008. PRICE: $5. i ELECTRONICS Australia, January, 1984 59 árf

e .

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Iiran L . - 1111D1

All New, L `' I} Cat D-2940 All Mode, 1 All Powerful Computer Aided Transceiver FT-757 GX Wow! What a transceiver. Everything All mode-including FM with no you could EVER want...and then optional extras some! Even before its release, Yaesu All HF bands from 160 to 10m have over 5000 on back order. that's including WARC just from the brochure! General Coverage Receive -500 to 29.999 M H z It's the absolute latest state-of-the-art with your in design-in fact, its CAD/CAM Computer Aided-use micro for external control (computer aided design, computer duty aided manufacture) ensures unbeliev- Full 100W PEP/DC at 100% able standards of reliability. cycle NOT $1399 BUT AN NOT EVEN $1199 INCREDIBLE $999 Over FC-757AT Automatic Sounds too good to be half a million .> true? Come dollars worth of Antenna Coupler! - - "- & see Incredible! The sort of coupler you :- dream about Uses an inbuilt 8 -bit AMATEUR GEAR! micro to automatically find the ONLY GX right band and then match for FT- 757 ...and now we're grossly over- minimum SWR. Includes in -line 5399 SWITCH MODESUPPLY stocked. Our warehouse is just wattmeter, SWR meter dummy Just about as neat as they come! bursting at the seams. We must load with 100W rating! Cat D-2942. Fits under your FT-757 and you'd clear the excess immediately! hardly notice it's there. Designed just for the FT -757, this superb You reap the benefit: look at the RS -232C Interface unit makes your base station really bargains on this page and you'll look the part! 240V input. WOW! Run your transceiver via Cat D-2941 agree! But hurry - at our low, your micro computer! This quality low prices even our excess stock interface allows external control 899 INCREDIBLE! $299 is not going to last too long. And of VFO, memory functions etc. ONLY you'd kick yourself if you missed 4800 Baud - it's so fast! out! Cat D-2943

Australia, January, 1984 SMITH 60 ELECTRONICS DICK 4 r -.il CAN YOU MEET - ;i3 h ; _ ..-.'' THE CHALLENGE' -,-` OF A 'HOME BREW'F. yv v,a UHF TRANSCEIVER -? The 'good old days' of amateur radio (when you j7j ,g m proudly built your own gear) are here again! And with the all -new Dick Smith UHF Explorer, you'll end up !U i`I4 with a transceiver of lower cost-and higher quality- .°" ++ than a commercial unit! YES! A complete up -to -the- 1 n 4° minute design with locked -loop frequency synthesis! \ .2 ,!r

Freq. Coy. 438.025 - 439.000MHz in 25kHz steps. Cat K-6300 No. of Channels 40 Superb hand-held trans- Mode of Operation FM people Supply 13.8v DC. Receiver 340mA ceiverfor on the with full audio output and all go! Covers full 438-439 options. Transmitter 2A more MHz band (25kHz steps) (5 watt output). Receiver Dual Conversion Superhet $199 with simplex AND standard Sensitivity 0.4uV for 20dB quieting OPTIONAL UPGRADE KIT 5MHz repeater Selectivity +/-7.5kHz - 6dB split. Cat D-2930 A superb backup package: Repeater, S +/-15kHz - 60dB meter, additional xtal filter & new front NiCad battery Ad¡. Chan. Reject Better than 80dB f. and Transmitter panel! Cat K-6302. rubberduckie whip Power Output 5W (typical) areincluded! Deviation +/-5kHz ONLY $24.50! 1.3 Low 720g weight Switchable 200mW ANTENNA KITS 1W output. UHF antenna kit has gutter gripper, UHF whip & 10 memories cutting chart, base & UHF co -ax. Cat D-4014. $24.50 Deluxe Magna Base: For'centre-roof I . position41111/ AND IT'S without drilling holes! super idea Cat D-4514. $29.50 ONLY NEW! THRIFTY NOVICE HF Yaesu TRANSCEIVER! YM-38 dual Z desk -type FT -77S Low power version of the scanning famous FT -77 transceiver. One of the most popular mike -- a -- ... Yaesu models around. Now novices can get onto HF at a Goes with low, low price-without sac- most trans- / rificing any of the features ''.1 ceivers -dual 1DC of the big rigs (except power / impedance. Comes -& you're not allowed that!!!). wired with pin plug, Later whenyougetthat suits 757GX & most amazing9 big ticke just add a linearon, new transceivers. and you're up with the big ` It'Sounds really great, value! boys.! Cat D-2914. looks smart, too. Cat C-1113. ' THRIFTY EXTENSION SPEAKER! ` Was $5Z - SP -55 Yaesu Speaker (SHOWN . Suits most transceivers-ideal for WITH D-2545 The - dog -piles or high QRN when those LINEAR ONLY UNDERNEATH.) little speakers inside most sets -.FT-690 just aren't good enough! Cat D-2913. Channel 0 has been given the shove-so all amateurs will soon be able to use 6m $29so WOW.( INCREDIBLE YAESU properly. Here's your chance to grab an VFO BARGAIN: all -mode portable/base/mobile rig-at a fraction of the normal price: The Yaesu 5.5-5.0 FT -690! 12V, internal batteries or external MMB-1 Universal FV-107 MHz supply.'Around 5W out. Cat D-2886. MOUNTING Superb! Will suit Normally most transceivers BRACKET and has tons of $425 so.' $i For mobile mounting of room inside for or box d ...our price most HF transceivers- other projects (eg: a suits FT ONE, 980, 107, transceiver!) Cat D-2870 757, etc Saves the rig 70cm Linear Amp slopping about all over $200? Was Get real oomph from your $150? the cad Cat D-2944 No...now a FT-780 or sim. handheld! $ crazy $69 This FL -7010 gives you around 10W at 70cm. Cat D-2544. Dummy load VA Pi! 6 metre Linear Amp load & absolutely flalmt response Boost your FT -690 to FL-6010 fromfroWm DC to light (well, almost: it's flat $1995 ! around 10W! It's ideal for $'O Cat to over 500MHz!). A must for the mobile - 12V operating D-2545. VHF/UHF amateur. Cat D-7025 Electronics See page 99 for address details ' DSE/A687/TH 2 o the Serviceman 0 0 0 0 1

A fault that the customer didn't know about It seems that never a month goes by without encountering at least picture and extending about one third of one frustrating job; either an intermittent or a fault so obscure 'that the way across the screen, becoming gradually less intense. It wasn't there is no profit in the job by the time it's finished. Perhaps this is all that obvious, except on some light video just as well, for the sake of these notes, but that is small content, but I was surprised that it was consolation at the time. This month was no exception. there at all. It also put me in something of a The set in question was a National supply rail figure already mentioned, quandary. Was it a genuine fault, or was 36cm portable, model TC-1404. This is a then looked for other supply rails. As it an unfortunate characteristic of this quite recent model and the particular set usual, there was low voltage rail - 12V model? If it was a genuine fault I didn't was only about 18 months old, a point of in this case - derived from an overwind mind looking for it, but there wasn't some importance as it transpired. The on the line output transformer via a half much point in bashing my brains out customer explained that it was used as a wave rectifier and a regulator transistor, trying to cure a condition which was second set, mainly by his wife in the the latter controlled by a zener diode. normal. kitchen and, in answer my question, to The only snag was that the supposedly The trouble was I didn't know how to described the as having trouble "... 12V rail was down to about 4V. The first find out. I didn't want to ask the in stopped dead its tracks." thing I checked was the zener network, customer because, if it was a set In view of subsequent events, there D552 and a conventional diode D551 in characteristic, I would only be drawing were times when I wished that the lady series, but this seemed to be functioning their attention to something which, until herself had brought the set in. After all, correctly. And, since I could find no now, they had not noticed and were she was the one using it and she might evidence of a short or heavy load across quite happy to live with. And once have been more inclined to mention this supply rail, I was eventually forced having had it pointed out to them, they any other, more subtle, faults she had to suspect the regulator transistor itself, would never again ignore it. It was at this observed. But at the I time simply took Q552, a 2SC1846. stage that I wished the lady had brought the customer's word for it and assumed In fact, this hunch proved correct. The the set in; at least she may have that, like most total failures, it would transistor had developed some rather volunteered some. comment about it if probably turn out to be a fairly routine obscure fault and replacing it proved the she had noticed it. exercise. point conclusively; the 12V supply was While I was musing thus, another much restored and the set promptly sprang more serious fault appeared; one about NO SERVICE MANUAL into life. "You beauty", I thought, which I had no doubt that it had to be "Another redskin bites the dust." But almost immediately I realised that Í fixed. The picture suddenly went quite did have, one problem; I had Unfortunately, my joy was short lived. never dark and, even though I instinctively Taking a more critical look at the picture encountered this model before and I had tried to correct this with the brightness I realised that it was exhibiting a degree no service manual for it. I immediately control, the effect was only partially horizontal ringing; contacted the distributors and placed an of a series of vertical successful. Then, a few moments later, order for a manual, but decided to have lines starting at the left hand side of the the brightness shot up again and a look around the set in the meantime, everything was overbright. just in case there was something obvious Not only was this something of a shock be to seen. to the system, but I was again puzzled as In fact, I progressed as far as locating to why the customer had not mentioned CHANGE the main HT rail I THAT LIVER and measuring it. / the problem. I found it hard to believe ON THE expected a figure somewhere between SHOPPING LIST To ANcHovY OR YOU'LL that they wouldn't have noticed it, so I 110 and 120V and when I measured it at MATCH THE COUCH. was inclined to put it down to a around 115V I reckoned it probably breakdown in communications at the wasn't far In out. fact, the circuit domestic level. I could imagine the subsequently showed 114V. housewife detailing all the things she But with the HT rail seemingly intact I wanted her husband to tell me about the hesitated to waste more time set, and him dutifully saying "Yes Dear," floundering around in unfamiliar territory while thinking about his golf game and without knowing exactly what I was promptly forgetting everything else. looking for. I put the set to one side until But that wasn't going to help me much manual arrived. the now; I had the fault in front of me and I When it did arrive I checked the main had to find it. As for the ringing, that

62 ELECTRONICS Australia, January, 1984 would have to wait. My first check was COLOUR on the 114V and the 12V rails, to see File these notes TV whether they varied significantly with CHANGE OVER the brightness changes which, The serviceman's notes are fortunately, occurred fairly frequently. intended to be both entertaining MODULES AND But there seemed to be nothing and, for fellow servicemen, significant happening here. informative. But when you . SPARES

Next, I began checking out the encounter a fault which you HMV EMI C211/212 brightness control circuit. The brightness remember appeared in these Power supply $38 change over control function is via pin 4 of the video notes, can you find the appropriate Horizontal $45 change over IC; IC301, AN5612. On the one hand it is issue easily? Probably not, if it Vertical $22 change over HMV EMI C221 fed with a varying voltage from the occurred more than 12 months Power supply $32 change over brightness control pot, R309, 10Ió2 ago. Horizontal $42 change over which is connected across the 12V rail So why not make a brief Vertical $24 change over but with a 56k2 resistor, R320, between summary of each fault as it is PYE T29/T30 Scan & Signals $53 the bottom of the pot and chassis. change over described, together with the month Philips & Kries. Early Also connected to pin 4 is a sub - and year, and file it along with that Power supplies $53 change over brightness control, R559, a 100k52 pot. set's service manual and other P/Supply controls $18 change over The moving arm connects to pin 4 while data. It could well save a lot of Sound $15 change over Other models available one end of the pot connects to a rather hassle next time you encounter a RANK complex network fed from the line fault which you're sure was dealt All deflection boards $48 change over output transformer and the other end via with "... a couple of months ago". SHARP Horizontal an equally complex network from pin 5 $24 change over 26' BLAUPUNKT of IC501, ÁN5435, referred to simply as Early version $28 change over the. "jungle". In fact it contains the noise input was constant, the brightness P/supply & mains unit $28 change over detector, the sync separator, vertical and voltage was constant, yet the output was Remote receiver $48 change over horizontal oscillators, etc, and varying. Remote H/Piece S35 change over Complete chassis $80 change over something called the which I protector didn't have a spare IC so I had to TYNE feeds pin 5 and, I is assume, a form of order one and, while I was waiting, I Convergence $38 change over beam limiting circuit. pulled the old one out and fitted a EHT + P/Supply $48 change over NATIONAL CP2000, TC86 socket in its place. That way I could save VOLTAGE Power supply $30 change over CHECKS time when the new one arrived, and also Vertical $30 change over All this seemed frightfully complicated refit the old one should any such test be Video $48 change over SONY K1830 and I decided as a first step to monitor necessary. Board A $48 change over When IC I the voltage fed to pin 4 of the video IC the new did arrive lost no Board D $36 change over and, at the same time, monitor the video time in fitting it, then switched on and Board E $48 change over into the same IC, which comes in on pin waited. The picture came up normally Board F $48 change over HANIMEX HCT26-700 1. So I stoked up the CRO ánd and, after making a minor brightness Line scan 553 change over connected it to pin 1 and connected the adjustment, I put it to one side where I Field scan $48 change over voltmeter to pin 4. And finally, I set up a could watch it while I went on with other Decoder $48 change over GEC 2213 & 2621 & 2612 second meter with which I could jobs. It ran all that day without so much PC706 Complete $53 change over monitor the collectors of the R, G, B, as a flicker, and all the next day as well, a PC737 $53 change over output transistors. far longer time than it had run since I had PC687 $48 change over Then I waited for the first sign of started on it. PC470 $38 change over brightness change. This could have been And when it ran the third day without PC656 $38 change over PC475 $53 change over a long wait because was I the effect quite trouble considered the point proved; at LUXOR erratic, not only in time but also in least as far as the brightness problem All P/Supplies $30 change over degree; sometimes it was only slight, was concerned, the set was OK. But 4KA THICK FILMS - ALL 59.00 EA sometimes the screen was almost what about the ringing which was still Second -nand colour TV boards, for most sets, blacked out. Fortunately I didn't have evident? Looking over the circuit again I available.. Phone for availability. long to wait this time and when it latched onto the horizontal linearity NEW PARTS happened the results seemed quite circuit which consists, in part, of an EHT transformers to suit Blaupunkt-Luxor- Nordmende-GEC 22" All $32 each positive; neither the brightness control inductor, L553, shunted by a 22052 1W - Philips & Decca $36 each 4 video - voltage on pin or the signal on resistor, R553. HMVC211/212 - $30 HMVC221 - $24 1 is pin varied in the slightest degree. This a fairly common arrangement LARGE RANGE OF OTHERS AVAILABLE. But there was quite a significant change and I have known some degree of New remote control handpieces to suit Luxor- in the collector voltage of all three ringing to be caused by the shunt resistor Blaupunkt-Nordmende-GEC-ITT/Greatz-Saba- Loewe-etc., all with 2 year warranty $68 each. output transistors, quite enough I felt to going open circuit. Unfortunately, this When ordering parts please specify clearly model account for the brightness change. The resistor, and others in the same part of and make. next thing was to check the input to the circuit, all checked o'ut OK. Which, Large range of spares In stock new & secondhand. these transistors or, more correctly, the for the moment, just about exhausted SPECIAL Triplers Philips type $11 ea. or 10 for three outputs of the video IC which drive my stock of ideas. Finally, after some $100. All Thorn thick films $9 ea. these transistors, pins 7, 8, and 9. thought, I decided return to the set to . Send cheque or money order to: And here, too, I encountered change. the customer and see what happened. It was only about 0.1 to 0.2V, depending Hopefully, if it was a new fault, they T.T.V.S., on the degree of brightness change, but I would complain. 159 Queens Parade, Clifton Hill, Vic. reasoned that it would not need to be In fact, when delivering the set, I made 3068 much at this point to be significant. All of quite a point about them contacting me Ph: (03) 489 1168 which seemed to suggest that it was the if they were not happy with the set's Minimum Order $35. PIP $3 Orders over $100 Post Free. IC itself which was the culprit; the video performance, for any reason. I even

ELECTRONICS Australia, January, 1984 63 In fact, that was many weeks ago and a check with the customer at the time of The Serviceman writing confirms that it has given no that knew the went so far as to explain that there had he was quite confident trouble since. So I think I really can rest been an intermittent condition (which cause. "Replace C555. It's a 101.¿F electro. easy this time. But one other interesting sure. But wás true) and that one could never be That will fix that problem for point emerged. When I returned the set 100% sure that these things had been I'm sorry, I can't help with the brightness the second time I questioned both fixed (which is all too true!). But I problem." parties quite closely about both the deliberately avoided describing the So all I could do was thank him, and brightness and the ringing problem intermittent fault, thus leaving myself console myself that, apparently, I had at before the first failure. some degree of "out". least solved one problem. But where Both were quite adamant - and I have was was C555 and what did it do? I hadn't no reason to doubt them - that neither I heard nothing for a few days and hoping that that was end of the story. been able to find it while I was on the fault had been evident before they But then the lady was on the phone and phone, and the technician took it for brought the set to me. So what had her first comment was that "... there are granted that I knew the circuit as well as happened? I can only assume that the lines down one side of the screen". Oh he did. electrolytic fault, being a mechanical had I it ít turned had lain dormant until the set well, I thought, mentally shrugging my When finally tracked down one, yet and manhandled, shoulders, I half expected this. But it was out to be a filter capacitor for been moved around her next comment that really rocked me. another voltage rail derived from the even with reasonable care. "But that's not the real problem. The EHT transformer; the 190V rail supplying, And so it wouldn't have mattered picture keeps going dark and then of all things, the collectors of the R,G,B which of the customers I had dealt with, coming bright again. It's very annoying." output transistors. Suddenly all became or how carefully I might have questioned in would them, wouldn't have been able to Well that was something I hadn't clear. Any ripple this supply they expected. After all my effort, and having modulate the brightness at the ripple, or help. story still felt so confident, it was a nasty blow to "ringing", frequency. However, I'm aware that the leaves some questions unanswered. Was realise that I was back to square one. But Then I had another thought. Could the the broken lead which was probably there was little I could do except make electrolytic also be responsible for the - suitable apologies and non -committal brightness problem, assuming it was making intermittent contact - the only I had the electrolytic dried out as excuses and arrange to get the set back intermittent? I hardly dared hope that fault, or well? In view of the set's recent origin I into the workshop. But just how I was might cure both faults at the same time. going to tackle the problem eluded me Finding C555 on the chassis wasn't easy hesitated to accept this idea, eccept that for the moment. as it was tucked away in a bunch of other the technician to whom I spoke was components near the EHT transformer. obviously familiar with this fault in this After I had recovered my composure was it easy to get out and I had to chassis; there was no doubt that he had somewhat I made a decision. As I have Nor the solder sucker to work to do the seen it more than once before. said before, I am not too proud to ask get job. And this revealed something else. The other point concerns the observed help when I find myself out of my depth, As I solder away from one variation in voltage at the R,G,B, output and this was one such occasion. I had cleared the lug it obvious that it was quite pins of the video IC. With the benefit of already spent more time on the set than I became for and móre time loose and any connection ít had been hindsight, this was obviously a red i could fairly charge consuming trial -and -error activities could making with the capacitor itself was herring, yet it was real enough. Was it a be even more costly. purely accidental. normal condition to which I attached too I on, much importance, or was it some So I rang the distributors and asked to fitted a new electrolytic, switched speak to their service department. The and crossed my fingers. The picture secondary effect caused by both supply free rails being -derived from the EHT technician I contacted was most obliging came up normally, and completely but, at first, it seemed that he was as fromall signs of ringing. Well, at least I transformer? I'm I have all those answers puzzled as I was. He certainly could offer had cured that one. As for the brightness afraid don't no ideas regarding the brightness problem, that would require another and, while it might have been possible to fault, problem, and seemed confused by my observation period. Once again I ran it find them by re-creating the the term "horizontal ringing". for several days, and once again it never practical limits on pne's time, and the need to get the set back to the It was only when I described this flickered. And, while one can never be always for such symptom in detail that he cottoned on; certain, I felt a goód deal more confident customer, don't allow

I luxuries. not only did he know what I meant, but when returned it this time.

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P 0504 Reducer .25 .20 CMOS IC's, LSI's etc. 1000 .i. 6 N times better than aluminium foil. u r will store up to 150 IC's on one o t - o UHF SOCKETS 225 x 150mm sheet. -*I 14- 4-- ' 2.51 6 ci) H 0500 $2.50 per sheet o Z 0180 $2.50 10 up $2.20 ea. 100 UP $1.80 MINI SPEAKER o 57mm o MINI TOGGLE W ea. 10 + SWITCHES P 1.20 1.00 OEM QUALITY 0509 Soc. SQ MNT I1 Large Ferrite Magnet. 250V 2 AMP RATED P 0510 Soc. RND MNT 1.40 1.25 Ideal replacement speaker. P 0508 F/F Coupler 1.95 1.65 6mm mounting hole Il Great for hobby projects. 12mm x 12.7mm x 20mm ID) J r, MICRON 30 WATT C 0610... .,-1-95- "s` o This brilliant Ilttle 30 watt Iron is Just the Now $1.25 ea. SAVE I- "bee's knees" for the electronics hobbyist, electrician or home handyman. We searched UP TO the world for a low cost yet quality Iron which SOLDERING IRON STAND met the criteria of light -weight screw in 30% interchangeable tips effluent thermal transfer UNIVERSAL from element to tip tip temperature maintains Z within the limits suitable for electronic work TYPE 0r and also Small household jobs and Of Course, fully S.E.C. tested and approved. I` T 1302 ea. 10+ 25+ NOW S1010 SPDT $1.25 $1.10 .95 J S1025 SPDT C/OFF $1.50 $1.25 $1.10 S1020 DPDT $1.50 $1.25 $1.10 4 W K $ 5.00 S1030 DPDT C/OFF $1.95 $1.75 $1.50 Z ry MU 45 PANEL MINI BUZZER 5-15V DC METERS QUALITY I CLASS 2.5 Handy little solid-state audio. ( T 2430 "Buzzer" 'dh or signalling device. O ¡gsrud,r / Just the shot for communicator Overall dimensions .0 REPLACEMENT IL.M1tES $9.50 panels, or for timer alarms or in 58W x 52H. Bolt . H- TIPS ,+ the car. Polarity conscious. Mounting Centres LA x Hole re- T 2434 Flat Tip .95 S.5062 . . $1.00 38 387 W T 2345 Conical Tip .95 quired 44mm. Nuts 0 & Washers provided. 1 T 2436 Instrument Tip .95 OOPS WE MADE A BOO BOO! Right now we have around 1/2 million Pre- o mium Quality Genuine Philips IN914/IN4148 SOLDER Signal Diodes - Out they go at never to be SAVE ON BULK QUANTITIES repeated 200 gram reel. 1mm universal gauge. Suitable prices. o for all types of electronic soldering. Resin cc cored and includes bit saving additive. DC FSD Resistance Price 10 Up Q

Q 0500 1 MA 200 8.25 7.25 T 1200 5 up 1'S 100'5 1000'5 Q 0505 5GUA 3500 8.25 7.25 Y 54.95 S4.50 ea. Z0101 4C 3C 2C Q 0510 5A .02 8.25 7.25 Q 0520 20V 2000 8.25 7.25 Q 0525 30V 3000 8.25 7.25 Q SAVE ON BULK QUANTITIES Q 0535 VU - 8.50 7.50 m PHONE YOUR ORDER ALTRONICS TOLL FREE 008-999.007 .. _.iy.. PHONE' YOUR .ORDER - ALTRONICS TOLL FREE 008-999-007 INTERNATIONAL STD SIZING YOUR BUDGET PROBABLY WON F STRETCH TO AFFORD OUR BLANK RACK PLANELS PROFESSIONAL SERIES ALL ALUMINIUM RACK CABINETS (Elongated mounting holes provided only) Height Finish ea. 10+ CAN LOOK EVERY NOW YOUR PREAMPS, AMPS, CONTROL MODULES MONITOR PANELS ETC. H0421 44mm Nat. Anod. 6.50 5.90 BIT AS GOOD AS TECHNICS, NAKAMICHI AND OTHER TOPMANUFACTURERS H0422 88mm Nat. Anod. 11.50 10.50 H0423 132mm Nat. Anod. 14.95 13.95 430 H0426 44mm Blk. Anod. 7.50 6.90 H0427 88mm BI k. Anod. 12.95 12.15 \_-' H0428 132mm 81k. Anod. 16.95 15.95 Max. Max. o Cable ,aa Bolt Size Size _+ -- n=- Small 3.5mm L7mm Med. 4.5mm 2.2mm m 3.2mm o Large ' o . , o . panel. a These beautifully crafted rack cabinet brushed finish anodised front boxes will give your equipment a real 1st * Individually cartoned. *Supplied in Flat class appearance. * All aluminium construc- Pack Form - Easily assembled in minutes. tion. * REMOVABLE TOP AND BOTTOM Elevation: H 1500 Solderlugs Pack 50 1.00 PANELS. * All dimensioning conforms to Side 9.50 * Natural or O - 254n5m C (Internal Chassis Height) H 1501 Solderlugs Pack 1000 the international Standard. 1.60 Black finish. * Ventilated lid. * Deluxe B (Mounting Bolt Centres) H 1510 Crimplug Small Pack 25 H 1511 Crimplug Small Pack 500 19.50 1.60 Cat. No. Finish A B C Was NOW H 1512 Spadelug Small Pack 25 H 1513 Spadelug Small Pack 500 19.50 H 0401 Natural 44 34 38 545.00 S39.00 49.00 H 1520 Crimplug Med. Pack 20 1.60 H 0402 Natural 88 57 82 55.00 54.00 H 1521 Crimplug Med. Pack 500 22.50 H 0403 Natural 132 89 126 59.95 39.00 H 1522 Spadelug Med. Pack 20 1.60 H 0411 Black 44 34 38 45.00 49.00 H 1523 Spadelug Med. Pack 500 22.50 H 0412 Black 88 57 82 55.00 54.00 H 1528 Crimplug Large Pack 20 2.40 H 0413 Black 132 89 126 59.95 H 1529 Crimplug Large Pack 500 32.50 Beware of other rack boxesihat do not conform to International Rack Sizing. .5 SAVE A FORTUNE ON ALTRONICS DIRECT IMPORT HARDWARE - JUST CHECK OUR BULK PACK PRICES - THEY ARE A FRACTION ON WHAT YOU'RE PAYING NOW! 1/8th inch WHITWORTH BA NUTS AND BOLTS SELF Bolts Cheesehead Nuts Brass Y STEEL NUTS ANO BOLTS t, .h..,,,steel, TAPPING SCREWS ZINC PLATED ROUND HEAD Pack Price ter Nickel Plated Steel Pack Qty. Price Length 1-1 1045 .95 $ .85 f H 1000 9mm 25 H 1047 4 BA x 6mm 500 5.95 aa- H 1002 9mm 500 4.50 H 1050 4BA x 12mm 25 .95 25 .85 H 1005 12mm 4.95 H1052 48A x 12mm 500 6.95 H1007 12mm 500 H 1060 6 BA x 12mm 25 .95 Pack Price H 1009 25mm 25 .95 H 1062 6BA x 12mm 500 7.50 6.95 4 25 $ .75 H 1011 25mm 500 H 1070 Nut Hex 4BA 1211...0500001 1 No. x 6mm .75 500 4.50 H Hex Nut 30 Nut Hex48A 00 2.50.00 HH No.4 x 6mm 1020 5.95 H 1072 1102100 H 1022 Hex Nut 500 H 1080 Nut Hex 6 B 2525 1.00 No. 4 x 12mm 25 .95 Washer 50 .95 H 1110 H 1030 S/Proof H 1082 Nut Hex 6 BA 500 12,50 H 1112 No. 4 x 12mm 500 5.50 Washer 500 6.95 4 Washer 50 95 H 1032 S/Proof H 1090 BA S/Proof No. 6 x 12mm 25 .95 H 1040 Flat Washer 50 .95 H 1092 4BA S/Proof Washer 500 5.95 H 1120 No. 8 x 12 mm 500 6.95 H Flat Washer 500 6.95 4 Flat Washer 50 95 H 1122 1042 H 1095 BA From less than 1c each. Huge Savings with Trade Packs (Contents: 500) H 1097 4 BA Flat Washer SOn 6.95 NYLON NUTS & BOLTS 14 'oh. Super Handy for Mounting Semis, RUBBER FEET Pack rrtir PCB's or ar ywhere an Insulated qi mounting is required Size (diam.) Qty. Price With 3mm Mounting Hole 1 1! H 0914 13mm 8 $ .85 Standard Stickon Type H 0913 13mm 100 7.50 4BA Cheesehead Pack Price H 0917 16mm 8 .95 H 1200 4 BA x 12mm Bolt 10 .85 16mm 100 8.00 10 .95 H 0916 H 1202 4BA x 25mm Bolt 4 .80 H 1210 4 BA Nuts 10 1.65 H 0940 12mm Stickon .65 H 1215 4 BA Washer 10 H 0942 12mm Stickon 100 9.60 68A C nee sehead H 20mm Stickon 4 .95 6 x 12mm Bolt 10 .75 0950 H 1220 BA .90 H 1222 6 BA x 25mm Bolt 10 H 0952 20mm Stickon 100 11.50 H 1226 6 BA Nuts 10 1.45 H 1228 6 BA Washer 10 .65 SPACERS (STANDOFFS) SUPERB NICKEL PLATED BRASS 4 BA UNTAPPED 4 BA or 1/8" CLEARANCE TAPPED Pack Pack Length Qty. Price Cat. Length Qty. Price Cat. 9mm 8 S1.00 H 1305 6mm 8 $ .95 H 1379 H 9mm 100 9.50 H 1359 6mm 100 8.50 1380 12mm 8 1.20 H 1362 9mm 8 .95 H 1383 12mm 100 12.50 -H 1365 9mm 100 9.50 H 1384 H 1387 25mm 4 1.00 H 1372 12mm 6 .95 H 1388 25mm 100 17.50 H 1373 12mm 100 11.00 H 1375 25mm 4 .95 H 1376 25mm 100 15.00 PHONE YOUR ORDER - ALTRONICS TOLL FREE 008-999-007 r PHONE YOUR ORDER - ALTRONICS TOLL FREE 008.999.007 QUALITY VIDEO KITS POWER SUPPLIES

Video has ___ been booming for quite a while, - If you're thinking of buying a power supply finally a range of video accessories in kit tNan ,ca A hl then buy from us, we are the experts on ENHANCER form. VIOEO re power supply kits and carry a supply to suit Two video amplifiers for both VCR and most enthusiast and professional require- Computer use, a brand new Video ments READ ON. Enhancer and our popular VCR Stereo Synthesizer. All four represent outstanding value for money and all are POWER assembled with Altronic's Extra Care. .,. ell 162 POWER SUPPLY VIDEO AMPLIFIERS VIDEO ENHANCER a._ DISTRIBUTION TYPE Simple, low-cost Here's a simple but effective Video Enhancer that project will allow is super easy to build at a fraction of the cost of is. you to drive five commercial models. video monitors from Unit sharpens picture detall, and tan actually BENCH STANDARD one source, such as improve the quality of a copy by amplifying the a video cassette top end of the vide() signal. 3-30v Output 0 1 Amp. recorder or a Fully Regulated, Fully Protected from Thermal Computer. Great for AT LAST A VIDEO ENHANCER KIT Overload and Short Circuits. piping video around * Based on EA Design. the Mouse, or for eu ISOMom.. K5825 m.,..Y,ee. clubs meetings $35.00 when screening K3200 $42.50 lectures etd, or for Computer * All the features of above PLUS Current Limit. demonstrations. * ETI Design. ENJOY THE PLEASURES OF STEREO SOUND * THE ALTRONICS KIT includes all components as (See EA Sept. 1982) K3205 (PICTURED) specified by ETI plus all power Supply Com- $49.50 ponents. DUAL TRACKING K5830 Only $45.00 ± 1.3 to ± 22v Output ® 2 Amps.: + 5V 0.9 Amps. 'r''+ VIM* 5YN71NE5ISER * Fully protected. M aeL * 10 turn pot enables Voltage adj. t0 within 10mV. * EA Design (March '821. Mkt K3220 I Mr F. !. i $89.50 i. HIGH CURRENT MICROCOMPUTER PS + 5 Volts 0 3 AmOS. + 12 Volts ® 2 Amps. - 12 Volts a, 200 milliamps. STEREO SYNTHESIZER This universal design has enough grunt to FOR VCR'S AND TUNERS power most disk drives. SINGLE OUTPUT K3350 $59.50 Synthesize realistic stereo from virtually any INVERSE AND NORMAL OUT-UT monophomic source by simply connecting this 13.8 VOLTS 0 10 AMPS HAM'S & CBER'S Brilliant new kit from EA, Super cheap and Super unit between the source and your stereo amplifier. Save the expense of a Mains Powered Rig. Effective. Whilst our K5830 is suitable primarily * Duality Phillips MN3001 (not second Source for VCR use this video amplifier is best suited to use with dropout). K3250 $8950 computers. The EA documentation sup- * Provision for 2 plied Is different signal sources. extremely well written and provides Selection of either source via front panel details for installation into television sets. Switch. HIGH CURRENT - DUAL METERING NO MORE SMEARY COLOURS, SIGNAL BEATS OR * Normal Or Stereo Sound selection. RF INTERFERENCE * Complete kit Includes all hardwear, Cables etc., even solar. NOTE NOT SUITABLE FOR USE WITH LIVE CHASSIS TV SETS. Important * beware of Kitset suppliers who sell this kit for less * you get less! K5850 $14.95 K5810 $55.00

FUNCTION DIGITAL 7 DIGIT GENERATOR CAPACITANCE METER FREQUENCY COUNTER E A SWITCH MODE DESIGN 2.50 Volts at massive 175 Watts. oo.INwN,..,u `- CLEVER DESIGN - a fully mains Isolated supply - with a "Switchmode" low voltage Circuit. 2145665 Easy to build. ; , _ K3300.. (EA MAY, JUNE '831.. $139.00 (10 TURN VOLTAGE the most essential piece of test gear isecond omy with Dell.' Instrument Case K3301... CONTROL OPTION) ... $1 0.00 to a multIrneten on any n000yitt s Den.is 0000 UNBELIEVABLE 0.005% ACCURACY some Gin o 00 audio Signal generator TMis onion NEW DELUXE FINIS« (j 12V OPTION) utWtes latest the CNC111t re.nnituet to produce We are pleased to announce Me rhea» stable. low distortion waveforms of the Frequents and Period measurement to S00 K3302 EA JULY '83 $ 1 2.50 Digital I Capacitance Kit housed m Our Delu.e MO. Nigh Input A truly 'rersatlie unit at a bargain price 00400 ASS instrument Case. IwItII Optional Vine Men ten This fuOe 0 Tent instrument pit now Mtivlty. Professional unit at a fraction of Me ETI . a freouenny readouf Compliments SERIES REGULATOR DESIGN dlit leiiminafes tiresome Our top selling Digital Freduency Counter ano Colt of 0010 00 unite. llpl tlonl typical accuracy 2% S over. Function - } eneratar eroieCt KN Electronics vu. K sockets Provided tnr00000ut n low age rare 0-40 Volts r6C S Amps 200 Watts. point ranget .1 .10 . DO eW ONM Nominal - thats traila erOleCt Measures CapaCitaoCe Of ootn 10000 MOO WTAL Dua1NY ASS Case with Output Continuously variable 2 PP plastic - - 50 Polarized any non polarized Capacltorl from I Front * Current limiting 0-5 Amps variable. Onptp on inewave in s T% deluxe nand Specified LSL - than 0 e loot ranges * Specifications Second None. Linearity - triangle wave better man 1% e Checfk rvalues of unmatep capacitors to . So. a,ewav! rise lout time -evluzmaximum Mine little trimmers mat are never rodeo K2S0C $119.50 * Free from the hum and noise sometimes associ- Output mourude Stability -Deter than() the Select Oaenlse values an for filters and timing net ated with on range works within cane PRESCALER other techniques. Winn the e.ception Of me 01apiry all components EXCLUSIVE TO ALTIMNICS a K2501 A PROFESSIONAL SUPPLY mount on single ece maaing this kit suitable for EMn at COes precision measured CaOMitOrl $26.00 all construttnn accuratecuratete calibration Of earn range DECIMAL POINT K3325.... (PICTURED).... K2505 $85.00 K2521., $55.00 K2502 $7.50 $175.00 THE EVER POPULAR MUSICOLOUR IV EA PROJECT el r--.-»*r 5P" at 163 °.,,..":11.144:4,4' r-- Combination Colour Organ and Light Chaser. {r.M^v- Four channel Colour organ. Internal micro- a.ls VOLTS MUSICOLOURIV phone or connect to speakers for colour organ operation. (The lights Connected to each r Channel pulse in beat to the music proportional e to portion of frequency spectrum concerned.) L Four chaser modes forward and reverse. Out- put lamp load capacity a massive 2400 watts - that's 100 party globes. Full Instructions and every last nut and bolt included. Great K5800 $89.50 for parties, shop signs, display windows etc. PHONE YOUR ORDER - ALTRONICS TOLL FREE 008-999-007 TOLL FREE 008-999-007 PHONE YOUR ORDER - ALTRONICS

TRANSISTOR ASSISTED IGNITION GO ANYWHERE 12-240V POWER WITH DWELL EXTENSION kl These great Inverter kits enable you to power 240V appliances from a 12V DC power source. Tremendous for camping, fishing etc. Install into 30°/ your Car, Boat or Caravan. A fully regulated and overload protected design, locked frequency. Use to power , featuring XTAL .. hi -fl, TV sets, even electric drills for short time I: w.e, periods. FF a kriP FOR o wy MANY OF THESE KITS ARE NOW IN USE .l E]OT 0,^1C' EMERGENCY LIGHTING PURPOSES. C , t. .1"4 ALTRONICS' KIT features * Gold plated edge connector and PCB huss * Low age rate XTAL * Sockets for all IC's *High Efficiency Transformer. fl K6750 (EA JUNE '82) ... $199.50

($10 DELIVERY AUSTRALIA WIDE) al The Altronics Kit includes all components For 1 the modifications, detailed by Electronics Australia Feb. 1983. 40 WATT MODELS Yes, it's bad enough paving 52.00 a gallon for a fortune on an out of Tape Decks, petrol without wasting Suits small appliances, le. Turntables, assisted Ignition kit Shavers etc. Variable frequency adjustment tune engine. Fit this transistor as a In minutes and start saving money from the very enables speed control of turntables. Works a trickle charger when mains power Is available. .... k..,, next petrol stop. Easy to build! EASY CONSTRUCTION * VALUE PLUS 4 K4010 $35.00 K6700 $55.00 * KIT SUPPORT FOR THE MICROBEE * MULTIPROM INTERFACE PARALLEL INTERFACE PROPORTIONAL 44K OF PROGRAM STORAGE BUILD YOUR OWN INTERFACE JOYSTICK AND SAVE $$$ A simple kit to build - takes about 20 minutes, .s-. o. save on the cost of a built interface and save the a A v- L.1 .a cost of a serial printer. _ K9674 .,..,}: T; . . ¡. .... : I!" . p. . ,... , . .p K9671 $29.95 $32.50 ;...,:, .. ti .,.. (ETI DEC 83) ,.. )q

A sensational new kit for the MICROBEE, requires no modification to the Computer except for the AT LAST AN ANALOGUE JOYSTICK This is fitting of a 50 pin expansion socket. project Plot X -Y co-ordlnates on the Screen, sign your allow to store and easy to build and will you name. A great graphics aid. Complete kit software select up to 44K of eprom storage - acts like a mini disk drive system with the speed of including case, software example. RAM. Extra units may be added to further increase storage. The A!tronlcs Kit comes complete In every way 50 PIN EXPANSION SOCKETS * Full set of IC sockets. * Double sided, plated through board. Right angle type to suit Mlcrobee, floppy disk con- * Assembled connection lead to Mlcrobee. trollers etc. Fully documented. PCB with IDC sockets. f (plus sourCeflle). Mounts on and mates * Cassette monitor Included i THE MICROBEE KIT OF 1983 if Ít.:il EA...10 +... $7.50 k.e..,,o',lf tli.lasi fe D1196... $8.50 K9673 $99.50

EPROM PROGRAMMER RADIOTELETYPE MICROBEE FAX -DECODER 1E71 JAN. 831 DECODER fETi SEPT B31 CETI APRIL 1331 LIGHT PEN

IETI AUGUST 831

11111111111111111111111111111111111111111111111111111111111111111111 K9668 $55.00 PROVIDES DIRECT PERSONAL Versatile, low Cost and easy to build. Plugs 110 Suitable f or WITH YOUR BEE! Straight into the microbee port. CONTACT K9733 $24.50 2716. 2732. 2532. 2732A and 2764 Eproms Burn unnn uuuunnunnullll lllllll uuunnnnnu gamesng and eliminate cassette K9733 $19.50 Tills project allows you t0 decode the signals Of 1Óáál programmes radio facsimile KIT FEATURES Sockets for all other IC S 1 k shortwave stations transmitting ROTS encoded messages on vour Video K9649 $19.95 then 2716 supplied - get started straight away Front Display weather maps satellite pictures etc and 28 Monitor Receive up to date weather information, f This works ,n matrix Panel and Mains SEC approvedl transformer Rapers, all SOrtS of AT LAST -a light den or the Bee Den reproduce tnem.on vour not printer and 16 pin wire wrap sockets to flush mount International News before the 10w.resoiutlon graphics mode and connects Ribbon bin Semple cucdit uses DLL tech. the Complete kit Of Darts includes D1315 plugs 12 included) and ZIF socket on cooed military info directly to the I 0 Dort Complete kit lnckrdlnq personality Single PCB Construction Kit Includes C,lDle Cludedl 0615 Plug Complete to last nut and moues OBIS 2m CORD Fully documented with software OBIS Plug and backsneil for connection to micro 501, wisE LIcTi4, bolt. PCB example ¡See ReVIew ETI AUGUST 19831 bee Shielded pretlnned ONE YOUR ORDER - ALTRONICS TOLL FREE 008.999.007 PHONE YOUR ORDER --- ALTRONICS TOLL FREE 008.999.007 KAISE DIGITAL MULTIMETER DELUXE ABS INSTRUMENT SK 6100 CASE 44, I f

Case Color light grey front -rear panels black.

Our superb new instrument case will give your projects the professional appearance they deserve, * Internal mounting posts enable a wide combination of PCB's, Transformers, etc. to be accommodated (screws supplied). * PCB guide rails provided internally allow vertical PCB positioning to several locations. * Removable front and rear panels. Attractive textured finish one - side and plain the reverse side. (Enables direct engraving, silk screen printing etc. to plain side.) * Great for test instruments and other high grade projects. WAS NOW $59.95 $89.95 Cat 01100 Overall Size: 200W x 1600 x 7OmmH WAS NOW 10 + 50 + H0480.. $13.50.. $10.00.... Check the specifications/features of this superb Digital Multimeter. $9.00.... $8.50 Autoranging with manual override Auto Polarity displays probes - sign when reversed overange indication "Blink" and Buzzer warning Low MOLEX Battery warning PIN SOCKETS BATT Sign Shows. Sampling Rate 2 times SEC Power For use with Supply 2 x A penlight single pins up to batteries (300 hour continuous operation). Fuse .5mm dlam. Protected, spare fuse provided. Zero Adjustment, zero adjust button must if you change -a Make your own sockets for IC's displays, test probes. LCD Display, magnificent clear readout. Lsrs etc. Inbuilt Buzzer, available for continuity test, overload warning warning. and switch Ranges + / - 1000 V DC/600 V AC, AC and DC current resistance Supplied on "Break off" header 200 (Resolution .1 OHM) to 2000K OHM (resolution 1K OHM) in 5 ranges P0700 Pack of 100.. 1.00 Pre -Spaced .1 Inch. autoranging. ACCURACY 5% DC, 8% AC. $ P0701 Pack of 1000. $12.50 GET A TRADE PACK FOR YOUR WORKSHOP NOW.

Phone toll free 6am 8pm 1E511 for of personal service, or take advantage our24 Hour 7 day p/week Bankcard phone order service. Give your name address with postcode, phone number, bankcard number and ALTRONICS explry date then your order and presto order will be 105 STIRLING ST. - your process- PERTH - FOR INSTANT SERVICE ed and back to you in a flash. Please nominate Jetservice if you overnight delivery. - want $2.50 DELIVERY AUSTRALIA WIDE We orocess your order the day FREE ed and receiv- 008 999 007 despatch via Australia Post. Allow approx. 7 days from day you PERTH METRO AREA & post order to when you receive goods. Weight limited 10kgs. (09)3281599 AFTER HOURS RECORDED SERVICE $4.50 DELIVERY AUSTRALIA WIDE We process your order day received and despatch via Jetservice for delivery next day. All Mall Orders: Box 8280, StirlIng St, Perth WA BANKCARD 6000. HOLDERS CAN PHONE ORDERS UP TO 8PM (ESTI FOR NEXT DAY ALTRONICS RESELLERS DELIVERY - SOUNDS INCREDIBLE DOESN'T IT? Alright you cynics Just try us! weight limit 3.3kgs. Please note .that resellers may not have all Jetservice cannot deliver to P.O. box numbers the items advertised in (Australia Post would have a fit). stock, and as resellers have to bear the cost of freight, prices may be $10.00 HEAVY HEAVY SERVICE AUSTRALIA WIDE slightly higher than advertised. ALTRONICS reseller prices should how- must - All orders Over lokgs ever represent a travel onthe heavy service, that is road express. Delivery considerable saving over our Competitors' prices. 7 days average. - time VICTORIA QUEENS LAND WESTERN SOUTH NEW CITY CITY AUSTRALIA AUSTRALIA SOUTH WALES All Electronic Delsound PIE 229 6155 COUNTRY CITY CITY Components 662 3506 ALBANY BROKEN HILL SUBURBAN ADN Electronics.... 212 5505 Avtek Electronics... 267 8777 El6ctronics 602 3499 BIRKDALE BP Electronics 412681 Crystal TV 4803 Protronics 212 3111 David Reid Electronics 267 1385 MaGraths ESPERANCE COFFS HARBOUR Wholesale Sound Jaycar 264 6688 Electronics Accessories 207 Esperance Coils Harbour 3471122 2502 SUBURBAN Radio Despatch 211 0191 FORTITUDE VALLEY Communications 71 3344 BRIGHTON Electronics 52 5684 SUBURBAN St. Lucia Electronics.. 52 3547 GERALDTON SUBURBAN GOSFORD Brighton Electronics 296 3531 BENTLEIGH PADDINGTON Geraldton TV and BIRKENHEAD Tomorrows CHRISTIES BEACH Absolute ECO Technics 369 1474 Radio 212777 Birkenhead Electronics. 81 4077 Electronics Electronics. 557 3971 Force Electronics 24 7246 BOX HILL SALISBURY KALGOORLIE 382 3366 CARLINGFORD KURRI SOUTH ELIZABETH GROVE KURRI Eastern Colourview Wholesale275 3188 Todays Electronics 21 5212 Jaycar 872 4444 Kuni Electronics SLACKS CREEK A.E. Cooling 255 2249 37 2141 Communications 288 3107 MANDURAH CONCORD NEWCASTLE David Hall Electronics. 208 8808 KESWICK Jaycar CHELTENHAM Kentronics 35 3227 745 3077 D.G.E. Systems 69 1625 COUNTRY Freeway Electric DEE WHY Talking Electronics 550 2 386 WYALKATCHEM George Brown & Co CAIRNS Wholesalers 297 2033 698399 FOOTSCRAY D &J Pease 81 1132 David Ryall NOWRA Thompson Instrument PROSPECT Electronics Acro Electronics 689 1911 982 7500 Vimcom Electronics... 21 4011 Services 512404 Jensen Electronics 269 4744 ENFIELD SOUTH CROYDEN GLADSTONE al PENRITH DARWIN Avtek 745 2122 Truscott Electronics 723 3860 Purley Electronics 72 4321 COUNTRY Acorn Electronics.... 21 2409 IPSWICH Radio Parts Darwin... 81 8508 PORT PIRIE HURSTVILLE PORT MACQUARIE Ventronics 813491 Jaycar COUNTRY P & P Electronics... 281 8001 G.F. & J.A. Pointon... 32 5141 570 1000 Hall of Electronics.... 83 7440 BENDIGO NAMBOUR ALICE SPRINGS LEWISHAM RICHMOND Nambour 41 Ascom Electronics 1713 PrePak Electronics lindrea & Johnson... 41 1411 Electronics 1604 52 TASMAN IA 569 9770 Vector Electronics.... 78 4277 MILDURA PALM BEACH Farmer Electronics. 52 2967 MATTRAVILLE TOUKLEY The Electronics Centre. 34 1248 CITY Electronic and Creative Electronics. . 666 4000 TES Electronics 96 4144 ROCKHAMPTON D & I Agencies 23 2842 Digital Services.. 23 3380 COUNTRY WINDANG Pulley Electronics 2 1058 GEORGE HARVEY SHEPPARTON ALBURY Madjenk Electronics 96 5066 TOOWOOMBA CITY Hobart 34 2233 GV Webb's Electronics... 25 4066 Electronics 218866 Hunts Electronics 32 9677 Electronic launceston 316533 WINDSOR WODUNGA TOWNSVILLE Components 80 4654 BATHURST M & E Electronic A & M Electronics 24 4588 Solee 72 2015 Scientronics 54 8334 Sound of Music 31 4421 Communications.... 77 5935

RESELLERS WANTED IN ALL AREAS (Including WA). Phone: STEVE WROBLEWSKI (09) 381 7233 for details. PHONE YOUR ORDER -- ALTRONICS TOLL FREE 008-999-00 Circuit Fr Design Ideas the circuits have not Interesting circuit ideas from readers and technical literature. While this material has been checked as far as possible for feasibility, constructional details. been built and tested by us. As a consequence, we cannot accept responsibility, enter into correspondence or provide

+5V Multiple flash trigger .047 6 10k 10kí 10 6 Ie9d 1 A simple but effective multiple 13 9.70 - 7' DO O 14 triggering device for camera flash 04 15 o Ico AO 'Cl guns is the dialling mechanism on 4051 9368 12 A4 conventional telephones. These can A8 O usually be purchased (complete Al2 0 with the rest of the telephone) from 13 2 11 10 9 15 4 2 4 le post office surplus stores for a few +5V i dollars, and are thus cheaper than a fully electronic circuit. 118 A D E BBF O IC91 reveal 14 Opening the telephone will DI 15 9 BB a host of connections on the dialling 05 TIL.793 Al O IC2 o mechanism. Locate the wires 4051 MSD LSO ASO +5V connected to contacts that open A9 O and close when the dial is released 7 6 5 4 3 2 1 116 A130 IC9b after it is turned. This can be done Ic7 by visual inspection or by trial and -pooh 74145 + 1 error with a multimeter. Connect these wires to a flash gun lead 116 15 114

131 socket and plug in your flash unit. D2 0_1.110 Note that some contacts inside 15 IC3 10 telephone diallers are normally A2 4051 A6 open and others are normally 8 A10 + V Which ones to use c closed. depends A14 in. part on how your flash gun I 2 4 6 1 12 2 9 r9 operates - once again resort to trial + V 1 and error. The flash gun I used for IC6 741593 multiple triggering was a Sunpak t16 IC9e and worked best 13 11, 12 Autozoom 3600, 03 0 0__.0 9 with normally closed contacts. 15 10 A3 O IC4 +5V Furthermore, if all the energy 4051 12 11 (200mA) A7 0 stored in the flash gun's capacitor A71 0 were discharged with the first firing, 5. A750 +5V it would not charge in time for the .047 1 3 2 second firing. Therefore it will be ©M Z 10k IC9e necessary to use a "computer flash" 7 4050 (one that senses the amount of light 7 6 47k. /CS 555 reflected off the subject and turns 81C9c the flash off when it has been sufficiently illuminated). The time between the firings of the flash will be determined by the governor inside the telephone dialler. Suitable adjustment of this multiplexers select which four bits are .Hex display device can lengthen or shorten this the 9368 via the 4050 buffers. sent to time. When experimenting on such projects display can be any calculator -style The Finally, to take a multiple flash as EPROM programmers and LED display (multiplexed, 7-segment exposure, set the camera's shutter microcomputers, it is convenient to -cathode). common "B" "T" (for a time -exposure), display the address and data buses in on or An input voltage of about 0 to 2.5V shutter and dial the hexadecimal format.. This circuit was open the represents a logic 0 while 2.5 to 5V number of flashes you want on the designed to provide such a display. represents a logic 1. The circuit uses a telephone dialler. Readers in New The circuit is based on the Fairchild regulated supply of 5V at about 175mA. Zealand should note, however, that 9368 binary (hex) to 7 -segment For a somewhat larger display, try a will have to deduct the number decoder/driver. The 555 oscillator clocks they 9369 in place of the 9368 and insert 6852 of flashes they want from 10 to get the 741593 which is wired to count to 6 current limiting resistors in series with the number they have to dial: the in BCD, thereby selecting one digit at a pins 9-15. Any unused address lines on the telephone dial run time to be displayed on the multiplexed numbers should be tied to OV. wrong way. display. The 74145 decodes the outputs the for this item D. de Roos, $10 for this item of the 741593 and drives the appropriate J. de Silva $20 NZ. display cathode while the 4051 Croydon, NSW Christchurch,

ELECTRONICS Australia, January, 1984 ' 73 Gt iYI' 1:1:`1' O4R PRO ,('1'S SPECIFICATIONS: Spa._ - AM/SSB/CW/FM "(VA, (AM/SSB/CW) Cat 41/h, DR.6010 - FM K z - 29.999MHz NEB UDIEIE!fl® - TRIPLE 2 C7Ofl'P,1 -3 WAV POWER ACSUPERHE/BATTS/DC (CAR) WORLDBAND MODEL - BACKUP BATTERIES FOR MEMORY CF RADIO CR-2021 - WILL MEMORISE UP TO 6 PRESET FREQUENCIES - IT'S ALSO A SCANNERI WILL SCAN THE HF BAND BETWEEN / PRESET LIMITS. FM SCAN AS WELL) - NARROW BAND FILTER - FACILITY FOR EXT. ANT. AND EARTH 0.7/*/A. ` ;. is ///'//i::J TT 320 0 155 65mm WEIGHT -SIZE: 2.1kg rr \ ' ' J «MI-"i+al , I ../1) I Quite frankly we are astounded at the quality of this unit It is one of sise smartest looking modern radios aroundi Each unit comes with an extensive manual which includes detailed - la Ill «a Into on Short Wave Listening as well as a comprehensive list of major Short Wave stations) their frequencies and their correspondence -.-- i. address. al= law HURRY STOCKS ARE STRICKLY LIMITED - SO ACT NOWI u m a!! rdz--; Il $299 SAVE' 'TRADE' PACKS _,0404 GAMES OF SCREWS N, NEW MINI JOYSTICK New low price) This unit, which Is sirniliar to our competitor units BREADBOARD offers a huge saving. Why? Direct Import) The unit Is not fitted with a connector either because a specific connector limits its use to & NUTS etc.N Just the right size for many small projects. This board has the same specific compelen. Fit the connector yourself and save a fortune) By popular demand. features as our breadboards but measures a compact 80mm Now you can get commonly used hardware in larger DON'T PAY $49.95 bulk and save a fortune?? 60nnm. It has 420 holes. Cat. XE.7032 519.95 Cat No. DESCRIPTION Price Perfect for the occasional project HE -0736 Rubber feet stick on 12mm Pkt.100 59.60 Cat. PB 8808 56.95 HE'0738 Rubber feet stick on 20inm Pkt.100 511.50 H E 0913 703 Mica insulator kit Pkt 100 012.50 HE.0922 T0-220 Mica insulator kit Pkt.100 59.80 NEVI 60- KEY HP.2742 6BA Flat washer Pkt 500 $6.95 , HP.27524BA Flat washer Pkt. 500 $6.95 HS -1521 68Asee"Cheesehead screw PkL500 $7.50 HS-152248Ax4" Cheesehead screw Pkt500 - 55.95 COMPUTER HS 152748Ax4" Cheesehead screw Pkt.500 56.95 S P1/4\11 HP.27126BA Her nut brass Pkt500 512.50 HP.272248A Hex nut brass Pkt.500 $12.50 . , .,,- , r KEYBOARD HS 1607 No.4e 4" Self tapper Pkt500 54.50 H51609 No.411%" Sell tappet Pkt.500 $5.50 - AS USED IN THE FAMOUS MICROBEEI .-...... :"::.,:r $ .95 - SPST CONTACTS - FRAME MOUNTED 0\1 SEALED PCB MOUNT ..- - QUALITY UNIT ROTARY SWITCHES Cat XE3522 WHAT ARE STICK' ES? ONLY $29.95 As you can see "stickies" are stIck-on templates. Attach the template toa panel (note the Crosshairs for accurate alignment) and proceed to cut out a perfect hole) The plastic film also protects the panel from We have decided to discontinue our range of open "skeleton" wafer scratches while you are working on It. TECHNICIANS are switches for these. The new switches have contacts enclosed In a Stickies available for the common Irregular hole cutouts I.e. fully moulded plastic housing - reminiscent of European design Cannon 05.25, XL series chassis plug and socket and IEC.320 chassis (mains) rotaries. The silver.plated contact are terminated with PCB pins plug. instead of the usual eyelet. You can solder to the pin, of course, but LIGHT PROBE the pin also inserts straight Into a PCB. Another feature of the switch Is Its progranrabflity. A removable Ong with tab can be inserted Into the switch several ways to your particular requirement. For example, if you purchase a 1 x pole 12 way (mar) switch you could convert It to, say, 1 pole 7 way between stops. Versatile) Naturally the switches feature 3/8 x 32 TPI bush mount and a 7." shaft with standard flat The shaft is hard nylon moulded to help reduce signal capacitance 4<,` 1L95 problems, They are almost the same price as the inferior wafer units. We Description Cat. No. DESCRIPTION Pie This NZ made unit enables you to place a spot of bright light in the most awkward places. Ideal for servicemen or assemblers. SR -1210 1 Pole is 12 way NL'401025 way 'D' template Pack of 6 templates 51.95 kit A flash. 1-9 $1.95 ea light or lamp always a SR1212 2Polex 6way ONLY NL-4014 XLR.31 Series template Pack of 6 templates 51.95 seems to cast shadow where you need to well The design allows SR.1214 3 Pole it 4 way NL.4018 XLR.32 Series template Pack of 6 templates $1.95 exclusive you to "poke light' around cornets)) The SR.1216 4 Pole x 3 way NL.4020 IEC 320 Chassis plug Pack of 6 templates $1.95 unit is solidly made (Aluminium) and takes 2 penlight cells. A 10+ ONLY $1.75 ea two SR -1218 6 Poleo 2 way NL.4024 DIN Chassis socket template Pack of 6 templates $1.95 function switch (lockon and press.on) is also a feature. Cat TH.1838 ' S12.95

I ncorporati ng NUMBER 1 FOR KITS ELECTRONIC AGENCIES POST AND PACKING CHARGES Jaycar $5 - 59.99 151.50) 510 - 524.99 153.20) Mail Order S25 519.99 (54.50) S50 $99.99 SYDNEY SHOWROOMS - - 156.50) 5100 - 5198 158.00) Over 5199 (5101 By 117 YORK STREET PHONE: (021 264 6688 and 102) 267 1614 "Free INSURANCE for Road & Registered Post over 5200" All heavy or bulky hems TELEX:72293 lover 20kg.) sent Cornet Road Freight 512.00 anywhere CARLINGFORD in Australia. J/ Cnr. CARLINUFORO & PENNANT HILLS ROAD - PHONE: (02) 872 4444 SHOP HOURS CARLINGFORD, CONCORD & HURSTVILLE CONCORD Mon - Fri 9am - 5.30pm: Sat - 9am - 12pm: Thum night 8.30pm SHOP HOURS SYDNEY 745 BA N KC A RD 115 - 117 PARRAMATTA ROAD - PHONE: 102) 3077 Mon - Fri 8.30am - 5,30pm. Sat - 8.30am - 12pm: Thurs night 8.30pm

HURSTVILLE 121 FOREST ROAD . PHONE: 1021 570 7000 MAIL ORDERS AND CORRESPONDENCE: P.O. Box 185, Concord, 2137 . Via Your Phone,

74 ELECTRONICS Australia, January, 1984 circuit I Design Ideas +5V 24 24 EXPANSION 24 (24 PORT (B) B 6 6 AO AO CAGO AO AO 7 7 7 (C) Al Al 7 Al Al CM O 6 ) 5 A2 CA20 A2 A2 6 (E 5 5 A3 CA30 A3 5 A3 5 A3 4 4 4 (F) A4 A4 A4 A4 CA4O- 9 3 (H) 3 A5 A5 º A5 CASO 2 (n 2 2 A6 CASO A6 ? A6 (K) CA7O A7 A7 -A7 23 23 23 23 CABO A8 A8 A8 ¡(L) 22A9 22 72 22 A9 A9 CA9O-+ ) 19 19 IC5 IC6 (N) 9 A10 1C3 A1 IC4 Al A10 CA10O 6116P-3 6116P-3 6116P-3 -9 11116P-3 I CA11 O (R) CA12O

9 9 DO CDO O (2) 'N DO DO DO (3) 10 10 10 10 CD1 p 01 D1 D1 D1 I°1 11D2 11 11 11 CD2 O 02 D2 02 13 13 13 CD3 O-(5 13 D3 DJ 03 D3 14 14 04 CD4 O (6) 14 04 D4 04 14 (7) 15DS 15 15 15 COS O D5 D5 DS 13 2 1 16 16 16 16 CD6 RAM D6 D6 136 -1606 (91 DISABLE C B 1707 7 17 17 CD7 o D7 07 D7 ---J CS ÓE WE CS ÓE WE CS OE WE CS OE WE O1 I21 18 21 18 20 I21 12 18 20 21 112 18 120 12 20 12 ICI RAM 15 ENABLE 7415138 YO 4 A Y114 10) 13 BLK1 (-0' Y2 5 12 BLK2 (0 O B Y3 BIKJ 12j(O--' -0 +5V

2.2k

CR/V7/(11 741500

(V 2 S102O 11

13 (21) +SVO +5V DND(1, BIK1 : 52000-S3FFF GND ( 10 : 0.1¡ 0.1= 122 TANT BLK2 : 54000-S5FFF GND 1 BLK3 : S6000-57FFF

Extra RAM for purpose of this is to prevent data bus wire wrap technique (these are available the VIC-20 contention. For a similar reason, the from Tandy Electronics). The constructor signals OE and WE (produced by the should be aware of the non-standard pin The availability of expansion boards for control signal logic) are only active when numbering system used on the VIC the VIC-20 enables users to experiment S/02 is high. Expansion Port - the numbered row and with various additions to the basic Switch S1 is provided so that the lettered row are transposed with respect system. One such addition, described memory board can be disabled, without to a normal connector. here, is for an 8K memory board. removing it from the expander board. For further information regarding the Readers should be advised, however, This is necessary when other devices are VIC Expansion Port the reader is referred that adding custom memory is not really that occupy the same memory to the VIC-20 Programmer's Reference has added cost effective, unless one already Guide. some of the more expensive locations. The circuit can be constructed on a 22 L. Murakami, components. + 22 edge connector board using the West Beach, SA. $25 for this item. The circuit consists of four 2K x 8 -bit RAMs (6116P-3), an address decoder (74LS138), and control signal logic Money for old rope (74LS00). The address decoder is enabled by the relevant BLK signal (link WANTED: Your circuit and design ideas. We pay between selectable), and uses the address lines $5 and $40 per item published, depending on the merit and CA11 and CA12 to produce four 2K how much work we have to do to publish it. The payment for memory block selects. It should be each of the items on these two pages is given as a guide. If noted that BLK is strobed by S/02 (the in Every item system clock phase 2) within the VIC, so you have an original idea, why not send it to us? that BLK can only be active when S/02 is received will be acknowledged by mail. in the high portion of its cycle. The ELECTRONICS Australia, January, 1984 75 .iiiiiii i i i i i i i s s a11kW Ni.

20 200'2000 2 . 'Z00 400 ON , A'41dirs,/,,,,, 6 I

KWH RANGE

600W KWH KILOWATT-HOURS 411 Electronics Australia 3kW RESET ENERGY MONITOR] 0

Check electricity consumption with this

11111

ray JEFF SKEEN

Still suffering from shock after that last electricity . bill? With a little help from our Energy Monitor you can find out WARNING This circuit will float at 240V AC if just how much that pool filter, air conditioner or freezer the mains active and neutral in your adds to the bills. house wiring has been transposed.

Our Energy Monitor is really two Since there is only one council meter virtually impossible. projects in It one. couples the electronic fitted to the household power circuits, it This is where wattmeter our Energy Monitor circuit published in is not possible to obtain a break down of comes in. By connecting the Energy September, 1983 with a kilowatt-hour the cost of operating individual Monitor between an appliance and the meter, thus allowing both the power appliances. mains, both the instantaneous power demand and the energy usage of an Further, because most appliances are demand of the appliance and its energy appliance to be measured. not run continuously, working out the usage over a period of time is Energy usage is of prime importance to cost of running them over, say a week, automatically measured. The cost of most people because, as consumers, this becomes fairly difficult. The times during operating the appliance is then is what they pay for when the electricity which the appliance is operated must be determined by obtaining the charge per bill comes around. The council noted, then these have to be added kilowatt-hour from an electricity bill and electricity meter fitted to your house is together and multiplied by the power multiplying by the number of kilowatt- actually an energy meter which rating of the appliance. Finally, the hours shown on the Energy Monitor. measures energy consumption in number of kilowatt-hours must be The appliance power demand is kilowatt-hours. One kilowatt-hour (kWh) multiplied by the cost per kilowatt-hour. displayed on a large moving coil meter is the energy drawn from the mains by a If the appliance is like many these days which has switchable full-scale readings 1000W appliance running for one hour, and fitted with a thermostat, the on and of 600W and 3kW. The number of or a 2400W appliance running for 25 off times may not even be known to the kilowatt-hours of energy used is read minutes, or a 5W appliance running for consumer. out on a 41/2 -digit liquid crystal display 200 hours, etc. As a further complication, some (LCD) which has switchable full-scale The council meter has a series of dials appliances, such as washing machines, readings of 20, 200 and 2000 kilowatt- which total up the kilowatt-hours used. have different power demands at hours. A reset button has been provided There is no reset provided - the reading different points in their operating cycle. to allow the kilowatt-hour meter to be at the end of the previous quarter is So, before any cost calculations can be reset to zero at the beginning of each simply subtracted from the reading for done, the average power demand must measurement period. the last quarter, the result being the be calculated. As far as the average How it works energy usage during the quarter. consumer is concerned, this task is For the sake of clarity, the complete 76 ELECTRONICS Australia, January, 1984 44..*1.1.4+1"i6Fsfi?.,-.,''il, +jí`ia+}:;itii+ci1" .,y . ` ... ti . ..,.;/. iE,w1 414, 1'

_ <

3 4.000111011 ó (

Above is a view inside the completed unit while at right is the PCB assembly for the add-on kWh meter.

circuit of the Energy Monitor is shown. This includes the wattmeter circuit from the September issue, together with the additional circuitry for the kilowatt-hour meter. .., At the heart of the kilowatt-hour meter .y Y,, is a current controlled oscillator, or CCO. This actually forms part of the -1 original wattmeter circuit featured in September. Its operation was given only cursory examination at the time, so we will return here for a full description. The CCO is made up of IC2b and IC1d, plus associated components which are connected together to give positive feedback. Controlling current for the oscillator is provided by transistor Q1 which is in turn driven by the output of IC1c. The amount of the current flowing in Q1 is proportional to the power registered on the meter scale. IC1d is connected as a comparator, its output swinging from +12V when pin 3 is higher than pin 2 to -12V when pin 2 is higher than pin 3. VR5 and the 1k52 resistor, together with the 10k2 feedback resistor, form a voltage divider which produces about +1.5V at the pin 3 inputs of both IC1d and IC2b when the output of IC1d is +12V (assuming VR5 is set to maximum resistance, ie 47052). TO Ep 1 APPLIANCE A N CASE +12V

RI. 281144/48 100k 1'ó 3 TP2 Rib +12V 240VAC 100k 1% 18k r4 TL074.LF 347 SW. + VR1 R2 50k 2.7k C1' 1% 33k 0.111 MA VWa .12V 6.8k1 25VW 5W - 12V +129 0.1^ ----^ -1AA1-- 22k 5W MM 0V 1 1 0.11: 10k IC3 3309 741 DS SW 4 IC7a 104148 2 4 VR4 1000 01 4700 BC557 15 8.26 VR2 OV E -12V 0V TP1 LM13600. 11114 C FSD 1013700 OV 4.761 18k 6.8k a I OV OV 101, -12V ICIb 14 M.4 02

24104148 D4 IC2b 10k 6809 -+51V >1) -12V PL24.5VA 08 4.7 j 5.10 10VW 400111W 7 12V 0V 0V

0V . 0 0 4,1144001 7812 12V .0 5 i 22k 7812 7912 I ONO LEDL VR5 00 -, V 4709 VI 0 220 lo 8 25VW I6 V W T_ 0.1 i16 1k 3 VIEWED FROM IN OUT CNDI11IIlOUT V BELOW } 220 0.1= CND IN 25VW GND 1GVW OV

7912 12V

82k

D6 104148 56k

52a

OV 1-le DP4 DP3 DP2 4.112 DIGIT LCD At A2 A3 44

K/ Fl I9t Fll F4I I04 G1 F2 BACK PLANE G2 I82 G3 183 G4 38 Kl Ell ICI E2 1C2 E3/ IC3 E4 lC4 D2 03 04 D ª K Al Bt Cl DI G1 El Fl 42 82 C2 22 F2 G2 43 03 C3 D E3 F3 G3 44 84 C4 D4 E F4 04 3 5 34 6 5 36 37 30 29 11 19 10 31 2 5 24 15 14 1 26 27 21 20 9 18 7 22 23

+51V 7 0 21 2 23 24 26 25 13 14 15 16 117 9 8 7 8 9 10 112 11 37 38 39 40 112 44 C4 D4 E F4 G4 A3 B3 51V 84 C3 03 63 F3 G3 42 B2 C2 D2 62 F2 G2 Al 81 Cl D1 El F1 DIGIT G1 6 10 EN1 ,16 5 BP ICB EN2 74C946

3 J2 0411),14 CLOCK 45C1413 10 k IC5014 LEADING 6 52b 4020 ZERO 04121 RS RESET 100 VCC EN INPUT CARRY OSCILLATOR ONO STORE II I8 CK1 CK2 RS1 RS2 3 31 29 28 136 35 34 1 8 L.17 OpF 09 5.1V

OV OV 100k3 07 +5.1V .001 104148

0.1 1c7ó 6 4070 1 IC7d 9 11\3 1 D 4 OV

I RESETI .068= S3

OV- 1

-00 ENERGY MONITOR 7/Mi.

78 ELECTRONICS Australia, January, 1984 We estjmate that the current cost Energy Monitor of components for this project is approximately Let's assume initially that the output of The frequency at which the CCO IC1d has just gone to +12V. A voltage of oscillates for a given control current may $55 +1.5V will thus appear on pin 3 of IC2b be varied by adjusting the voltage This includes sales tax. and this produces a current flow from divider and hence the two reference pin 5 of IC2b equal in magnitude to the voltages. The further apart the two control current from Q1. This charges a voltages, the longer it will take for the Switch S1a selects the divided CCO .015µF capacitor, thereby raising the capacitor to charge from one voltage to signal and feeds it directly to the clock base potential of the internal Darlington the other and hence the longer the input (pin 10) of IC5, a 4020 14 -stage output transistor. The emitter of the period of the oscillator waveform. binary counter. This counter serves to Darlington transistor (pin 8) follows this Trimpot VR5 thus allows calibration of divide the incoming clock pulses by rise in base voltage, although two the kilowatt-hour meter. 16,384 (ie, 2'4). The result of all this is emitter -base drops (about 1.5V) will The output of the CCO is passed from that each output pulse from pin 3 of IC5 always separate the two voltages. the wattmeter circuit board to the is equivalent to either .001, .01 or Since the inverting input of IC1d is tied kilowatt-hour meter circuit board. At the 0.1kWh, depending upon the setting of to the Darlington emitter, it too will rise input of the kilowatt-hour meter is an range switch S1. in voltage along with the .015µF attenuation network consisting of two Thus, the reading on the LCD will be an capacitor. When the voltage at the resistors and a diode. These make the indication of the energy used in kilowatt inverting input of IC1d exceeds the CCO square wave output compatible hours. voltage at the non -inverting input - ie, with the circuitry of the kilowatt-hour To count and display the kilowatt- becomes greater than about 1.5V - the meter by reducing the positive peaks of hours of energy used, we have used the comparator action of IC1d causes its the CCO output to about +4.9V and event counter circuit described in the output to swing from +12V to -12V. clipping off the negative peaks. July issue of "Electronics Australia". Since This changes the voltage at the non - The input applied to pin 10 of the 4518 we have already described this circuit inverting inputs of IC1d and IC2b from IC and the first position of S1a thus thoroughly we will simply recap the 1.5V to -10.5V. It also reverses the consists of a nominal OV to +5V square basic details. direction of the current flow and so a wave at the CCO frequency. Briefly, IC3 is a 74C946 4'/rdigit discharge current equal to the control The 4518 (IC4) contains two binary counter/decoder/driver for use with current through Q1 flows from the .coded decimal (BCD) counters and these LCDs. The internal 'circuitry is fairly .0151.1F capacitor back into pin 5 of IC2b. have been connected so that each complex but essentially the input clock As current flows from the .015µF performs a divide by 10 function: pulses are applied to four cascaded capacitor, the voltage across it drops and The output of the first counter (pin 14) decade counters and a half -digit counter hence the voltage at the emitter of the is , applied to the second position of (flipflop). The outputs of the counters are Darlington output transistor also drops. switch S1a and also forms the input to passed to latches which are controlled The capacitor continues to discharge the second divide -by -10 stage. The by the store pin (pin 34). until the voltage at the inverting input of output of the second stage (pin 6) is thus When the store pin is high, a counter IC1d drops below -10.5V. At this point the CCO frequency divided by 100 and value is stored in the latches and the the output of IC1d will suddenly switch this is applied to the third S1a switch display remains fixed. When the store to +12V and the cycle is repeated. position. pin is taken low, the latches are placed in a flow through mode whereby the latch outputs follow the counter outputs. The latch outputs are connected to four BCD to 7 -segment decoders, one for each digit. Segment drivers are connected to the outputs of the decoders and provide the special drive characteristics required by the LCD. In our circuit the store pin is connected to ground and this allows the display to update instantly whenever a pulse is received from IC5. The enable and leading zero inputs (pins 31 and 29) have been connected to the supply rail so that the counters and leading zero blanking circuitry are permanently enabled. Over -range indication The portion of circuit centred around IC7b, c and d, and IC8a, b and c is an over -range sensor designed to activate an arrow shaped annunciator located in the top left-hand corner of the LCD if the counter exceeds its maximum reading. To do this, the over -range circuit must sense when both the'/ -digit (pin 27) and Parts overlay for the kilowatt hour meter. Note that the display board must be carry out (pin 28) outputs are active and separated from the main board and the two soldered together at right angles. then signal the over -range annunciator

1 ELECTRONICS Australia, January, 1984 79 This wiring diagram should be used in conjunction with the diagram on the previous page.

on pin 6 of IC8b whenever the output of IC7c goes high. However, this has no Energy Monitor effect on the output of IC8b since pin 6 is already pulled high by a 100k22 pull-up to turn on at the next clock pulse. reaching the input of IC8a. These short resistor. IC8b and c are connected The'/rdigit output will be active (ie, out spikes may be generated by IC7b if the together to form a reset -set (RS) flipflop, of phase with the backplane signal) signals applied to its inputs (the '/2 -digit the output of which (pin 4 of IC8b) is whenever the four least significant digits and backplane signals) do not have normally low. change from 9999 to 0000. It then perfectly matched rise and fall times. Pin 6 of IC7d is therefore normally low remains active until the counter is reset. Assume now that the displayed count and so IC7d simply gates through the The carry out goes high when the reaches 19999 (ignoring decimal points). backplane pulses applied to pin 5. In this counter reaches 9999 then returns to,the At this count, the carry out pin (pin 28) of situation, the signal applied to the arrow low state when the display changes to IC6 goes high, sending pin 1 of IC8a high annunciator is identical to the backplane 0000. also. IC8a and IC7c form an AND gate. signal and so the annunciator remains When the 1/2 -digit output goes activé, When both inputs of IC8a go high (ie, at off. the output of IC7b goes high, sending a count of 19999); the output of IC7c Let's see how the over -range indicator pin 2 of IC8a high also. The 1M1 resistor also goes high. is activated. When the count reaches and .001µF capacitor on the output of The output of IC7c is AC -coupled to 20,000, the carry out pin of IC6 goes IC7b form a low pass filter which pin 6 of NAND gate IC8b via a 0.1µF low. This causes the output of IC7c to prevents short output spikes from IC7b capacitor. A positive pulse thus appears also go low, resulting in a brief negative

80 ELECTRONICS Australia, January, 1984 11111 High Speed Drill Deluxe Drill Set $6 Drill Stand with Includes Drill, stand and flexibk\o\ Stand for Ref 20,000 drill Precision drill 3 X, Ideal for interchangeable collettes for drive complete with 30 (above). PCBs Ref y y7/II sizes from.1mmto2.4mm.10: accessories in carrying case. 20,400 , Includes the High Speed Drill, - ..WVX00 s` 500 RPM 9-16V. Ref 20,000 as shown above plus the drill 9116; it below. Ref ,o . $ shown 20100 / 1 ,.

1 I 1 Your The Ultimate joystick Flexible Drive S Improve for the VIC-20 and Atari Suits the high speed drill above. ; incredible Pointmaster is truly the finest Complete with chuck and . The , _ Joystick on the 'market and will colletes. Ref 20,700 add incredibly to your enjoy- w most sought after range of '1095 We now stock the ment of video computer games. a video enhancers at the best prices around. If you want to improve the quality of your video Just look 52998 NEW! Precision without spending a fortune, Sheridans is the High speed thumb place!! trigger Unique hand grip (as I d%4ag on actual aircraft) Self cen- Speed Model VP-5030 Video " __e« tring Long 150cm cord Capacity to 3.5mm, 9 to 18 volts. 20,000RPM . A really superb Detail Enhancer Illuminated drill that will give years of use. Design to rectify the loss of detail from VCR Pushbutton tapes. Perfect for off the air recording and dub- bing. Now you can actually improve on the These superbly made IMO original. At with Sheridan you save a fortune!! pushbuttons are perfect for car Power requirement 12VDC Input 1 video and other alarm situations. Output 3 videos SPDT momentary action with Enhance 9dB 12V long life globe. Available in red, green or yellow lense. Drill Set $15.00. Put 4s -oho t'ff0 . only - Others are asking If/ This fantastic drill set includes %....,,,.,,,....LL them in the losers corner!! .., 1 V . the high speed precision drill ¿,,,, _ shown above plus a wide range ® O O $79°° only 5895 of 15 accessory drills, brushes 13595 and grinders. Ref 40,100 Heavy Duty Stand VP-5010 Video 'ten' Hewlett Packard Opto Suits precision high speed drill. . Perfect for any hobbyist work. HE/SP-5300 Anode Ref Image Stabilizer Equivalent tEnsure .5o7 (Common 40,400. you don't get vertical Power 9V DC only $2.05 each, 10+ $1.85 rolls or blackouts. With slight Input 2 videos 520°° adjustment immediately Output 1 video HDSP5303 .56" Common O W stabilises picture of pre- ): . recorded tapes- removing the Cathode copyguard-signal. Price only equivalent to FND500 (but better) only $1.70 each, 10+ $1.55 Modutec ear Alarm 5710° This is the most powerful and comprehensive car protection system on the Australian market HP 5082-7730.3" common we have seen. Compare the features. Then anode you'll know its the best q, equivalent to MAN71, DL707) Automatic or Manual start 059 only $1.50 each, 10+ $1.35 When tripped it sounds horn 1/ and disables ignition system warning light 4aá S Dash mounted 4t b entry and exit times HP 5082-7740.3" common Variable ...,1,41k-- 12 months warranty \ cathode Protects accessories. 1,44 "?/ Jawbreaker purchase!! MAN74, DL704 etc equivalent to w Top quality English Made by only $1.50 each, 10+ $1.35 SAE 10 way .1" DIL DIP switch. only 4 Special top quality pushbutton oorA type. At a punchup price!! `--e'f',1 ^'- each 10+ 81.20 \ $1.30 L.mwó.:". Less than 1/2 price :\1 1. --t -. tQQPJ Bargain ary (( Relay of mount NeW Shipment PC superb miniature Both types at 1A/ SHERIDAN ELECTRONICS relays acts.ated 164 - 166 Redfern Street, Redfern NSW 2106. Phone (02) 699 6912, Large and SPOT125V andt2A/30V.Twoand heavy items 5V/75ohm coil at (02) 699 5922. Mail Orders to Dept ETI, PO Box 229 Redfern NSW 2016 sent reight On. type coil. Quality Trading Hours Mail Charges Note: 12Vtypes: price. 9am-5.30pm $5.00-59.99 $3.50 We regret we cannot give quantity a really low p Mon -Fri wuten á Thursday 9am-7pm $10.00-$24.99 $4.00 discounts on Credit Card purchases. $1.60 Saturday 9am- 12noon $25.00-$49.99 $6.00 Credit Cards: we accept both $l.7sea $50.00-$99.99 $7.00 Bankcard and American Express. // NB: All Prices include tax $100.00 or over $8.00 ), Minimum Order $6.00 LL . ROp1RVINC ELECTRONICS 425 HIGH ST, NORTHC_OTE 3070 VIC . PHONE (03) 489 8866

. I VIDEO ENHANCER . 35 NAIL FINDER I SPEED btN R ii o ~roots Amtnlia VIDEO ENHANCER EA OCTOBER 83 WWI Essential for the home han- Nail dyman the Finder will help 117 locate timber studs behind Gyprock or plasterboard wall surfaces as well as locating pipes and wiring in walls. evr r . Pm,, buried r POWER ENHANCE 41111. o

Paying speeding fines can be a painful business. Build this in a hiti with Like tone controls amplifier, touch up the signal Speed Sentry and avoid further Pains In the wallet. this Video Enhancer. EA OCTOBER 83 EA OCTOBER 83

TRANSISTOR TESTER $15 SOIL HEATING UNIT $70 WATTMETER $65 Have you ever desoldered a 1 The here will measure suspect transistor, . -%; ° unit described only to find that N the power consumption of any mains O K ? appliance with a rating up to three checks (I Troubleshooting et I" kilowatts. It makes use of a special exercises are often 1 op amp called an "output hindered by this transconductance amplifier" or OTA, type of false alarm, y for short. but many of them =a- could be avoided with an "in -circuit" wASTwriTil EA SEPTEMBER 83 component tester A little heat applied to the soil using this devicemay just do such as the EA the trick. EA SEPT 83 Handy Tester. EA SEPTEMBER 83

CORE BALANCE RELAY ETI 587 CAR ALARM 10-15V '

WHEATSTONE BRIDGE $45 $44.50 VIDEO AMPLIFIER $15 Mains -operated equipment.that goes faulty is lethal. "core - vNFATSTOtE MIDGE potentially Electro -mechanical `t 7 balance relays" which sense earth -fault ' Electronics Australia currents and trip a circuit breaker have been L,- available for house -mains ihstallation for - ° a_ ..« ... .-... some years. Portable core-bálance relay ' units have obvious advantages. Protect VtDEo IN VIDEO AMPLIFIER yourself - and your equipment - with this :411,_w, :r simple, inexpensive project.

. cue .. FRIDGE DOOR ALARM EA AUG 83 ±12V RAILS FOR LAB Bothered by smeary colours, signal, beats DOWER SUPPLY When the refrigerator door has been and RF interference on your computer left open fof about 20 seconds - or, more correctly, when the light has been display? Throw away that cheap and nasty EA July 1983 on for 20 seconds - this EA Fridge RF modulator and . use a direct video - Alarm will emit a series of reminder beeps connection instead. It's much better. until the culprit closes the door. The Video Amplifier features adjustable gain Ia and provides both normal and inverted $13 $9 outputs. Power is derived from a 12V DC FOR PCB VERSION plugpack supply. EA July 1983 An inexpensive addition to the 50V SA Lab Power Supply which snould prove its worth many times over. It provides addilonal fixed ±12V outputs for lower power' Portable 31/2 Digit Heart Rate Monitor applications. EA GUITAR BOOSTER

Driveway Sentry $17.50

GUITAR BOOSTER , w. ,. Y 444 $3.1 il> Here is a new heart rate monitor designed Specifically for use by the dedicated fitness seeker. Small enough to carry when jogging or exercising, it features an optical sensor no Activated by your car's headlights. the "Driveway Sentry" in-built + tlntE electrical Connections to the body, an Calibration will turn on a driveway or garage light so that you can make a Y/a5r Oar circuit and direct readout on a large liquid crystal display safe exit from your car on the darkest of nights. At the end of (LCD). live minutes. It will automatically turn the light off again. JUNE EA 1982 - Hi 48-50 A'BECKETT ST, MELBOURNE 3000 VIC - ° PHONE (03) 347 9251 , Mall Order Delivery Iwst...tiews: Minimum Pock and Post $3.00 for Australia Post. Please allow extra for bigger orders and Certified, Airmail or Registered Post. Minimum order is 55.00. Please address orders to Mall Order Deportment. PO BOX 235. NORTHCOTE. 3070. VICTORIA" PHONE (03) 4811436. nc o 1 `t.1 M . -r - ..I"".-- . - .w . . r. - ,. y , Energy Monitor going pulse to pin 6 of IC8b. Pin 6, in fact, forms the set input of the RS flipflop. The reset input of the flipflop (pin 13 of IC8c) is normally tied high via a 1M9 resistor to the positive rail. When the negative pulse is applied to the set input, the combination of inputs causes the flipflop to toggle. Pin 6 of IC7d will therefore go high and so IC7d will invert the backplane signal applied to its pin 5 input. The signal applied to the arrow annunciator is now 180° out of phase with the backplane signal and hence the arrow annunciator will turn on to indicate the over -range condition. Note that, when the display over - ranges, the 1/2 -digit (ie, the "1") remains on with the arrow annunciator. The four least significant digits reset from 9999 to 0000 and continue counting. Switch 52 provides the reset function. When 52 is pressed, the reset inputs of the flipflop and IC6, together with pin 8 of IC7a, are taken low by connecting them to the OV rail. IC7a inverts this low level reset signal to produce the high level reset signal required by IC4 and IC5. A reset pulse is also generated automatically on switch on to ensure that all counters begin counting from zero. This is generated by connecting a .068µF capacitor in parallel with S2. Initially, the capacitor is discharged so that, when power is first applied, it appears as a short circuit. The capacitor then charges via the 1M9 resistor to remove the reset pulse after a 50ms delay. NAND gate IC8d forms part of the decimal point circuitry. Its job is to produce an inverted version of the backplane signal which is then used to drive the decimal point annunciators in Here is the actual size artwork for the PCB. Separate the LCD. Switch S1b switches the output the two sections before starting construction. of IC8d to the required decimal point position (either DP2, DP3 or DP4). board accommodates the LCD. As mounted using a 40-pin DIL socket. Finally, power for the kilowatt-hour shown in the photograph, the two Next, assemble the display PCB meter circuitry is derived from the +12V boards are soldered together at right according to the parts overlay diagram, rail used to power the wattmeter circuit. angles, an arrangement which keeps commencing with the 17 wire links. The This is regulated to +5.1V using a zener internal wiring to a minimum. LCD is mounted using two 20 -pin Molex diode, with decoupling provided by a Begin construction by mounting the IC socket strips. Solder each socket strip 6809 resistor and a 4.711F capacitor. components on the larger board. The to the PCB, then snap off the carrier best procedure is to install the 10 wire strips so that each pin connector is Construction links first, followed by the resistors, separated from its neighbour. The two Construction of the additional circuitry capacitors, diodes and ICs in that order. PCBs may now be butted together at is straightforward with most of the parts Note that all ICs used in this project are right angles and the edge connectors mounted on two small printed circuit CMOS and are easily damaged by static soldered. boards (PCBs). These are coded electricty. The ICs should be left in their Now go back over your work and 83kwh12 and 83kwh12a, and measure protective foam packaging until ready check that all ICs and the LCD are 86 x 93mm and 86 x 60mm respectively. for installation on the PCB and then the correctly oriented. The LCD used in the The larger of the two boards power supply pins should be soldered prototype is a 41/2 -digit type sold by Dick (83kwh12) holds all the ICs and first to enable the internal static Smith Electronics (catalog No. Z-4175). various minor parts, while the smaller protection circuitry. The 74C946 IC is Pins 1 and 40 of the LCD are identified by

ELECTRONICS Australia, January, 1984 83 WORLD RADIO TV HANDBOOK Energy Monitor two small white dots at the edges of the The larger cutouts for the meter and (see. LCD are made by drilling a series o display area parts overlay). Our of small > '? sample LCD also had a green dot on one holes around the inner perimeter of the side of the glass envelope. cutout, and then filing the cutout to a NEW! The new PCB assembly, together with smooth finish. 1984 the wattmeter PCB, is housed in a K&W Although our prototype used a bezel instrument case measuring 255 x 157 x surround for the LCD, readers are ' - Editions 77mm. Spray the Scotchcal label with a advised that these are in short supply. At

cr: l it 9 hard -setting clear lacquer (eg, Estapol), least two kitset suppliers are looking into 1984 RADIO AMATEUR'S then carefully affix it to the front panel of this situation, but our advice is "don't HAN the case. The Scotchcal panel can now hold your breath". Fig. 1 shows the DBOOK for the locations of the bezel mounting holes The essential annual for amateurs be used. as a drilling template front panel holes. for those readers who do manage to and professionals alike. obtain a bezel. Available Janurary 1984 $22.95 The PCB assemblies . can now be WORLD RADIO TV PARTS LIST positioned in the case according to the HANDBOOK 1984 wiring diagram and the necessary 1 board, code The authoritative diretory of printed circuit mounting holes drilled. You will also. x 93mm international radio and television. 83kwh12, 86 have to drill holes for the mains cord 1 printed circuit board, code Lists all stations, calls, frequencies, clamps and earth solder lugs, the two 83kwh12a, 86 x 60mm programs, etc for each country. cord entry grommets, and the 4 -way Available March 1984 $27.95 1 momentary contact pushbutton insulated terminal block. Those readers switch, 240V AC rated (C&K who previously built the wattmeter To order send your cheque (add P 8168 equivalent) model 8121, or project can transfer the PCB mounting & P $2.50 Vic; $4.50 elsewhere) or 1 rotary 2 -pole 3 -position switch, hardware, mains cords and clamps, and your Bankcard No. & Authorizing 240V AC rated (Lorlin type Signature to: the insulated terminal block straight into CK1030 or equivalent) this project. 1 display technical book 4M -digit liquid crystal All wiring within the Energy Monitor No. (Dick Smith catalogue Z-4175 should be run using 240V AC rated & magazine co or equivalent) 295 SWANSTON STREET cable. If 240V AC cable is not available, 1 40 -pin Molex IC socket strip MELBOURNE 3000 then a cable with a lower rated 1 40 -pin DIL socket insulation can be used and the insulation 4 insulated 8mm printed circuit bought up to par by fitting insulating board standoffs AN INTRODUCTION TO sleeving over the entire length of the 1 Scotchcal front panel, 254 x cable. This includes the wiring to the 77mm DIGITAL switches, LED and the PCBs. 1 K&W instrument case, 255 x 157 As a further precaution, a rectangular ELECTRONICS x77mm window of stiff, clear plastic should be FOURTH EDITION SEMICONDUCTORS fitted to the front panel cutout for the Electronic equipment now plays an Important 1 4518 BCD LCD (the plastic used for shirt box lids is role in almost every field of human endeavour. dual counter And every day, more and more electronic 1 4020 14 -bit binary counter ideal). This should be glued to the inside equipment is "going digital". Even professional 1 4070 quad exclusive OR gate of the front panel using epoxy adhesive engineers and technicians find It hard to keep 1 4011 quad NAND gate and will prevent the LCD pins (which pace. In order to understand new developments, 1 74C946 or ICM7224 4M -digit could be at 240V AC) from shorting to you need a good grounding in basic digital concepts, and An Introduction to Digital counter/display driver the case. As a bonus, the plastic window Electronics can give you that grounding. Tens of 1 5.1V 400mW zener diode will also protect the LCD from scratches. thousands of people - engineers, technicians, 2 1N4148 diodes Construction can now be completed 'students and hobbyists have used the - by securing the two PCB assemblies. The previous editions of this book to find out what CAPACITORS the digital revolutions is all about. The fourth wattmeter PCB is mounted using four 1 4.7µF 10VW PC mount edition has been updated and expanded, to 12mm insulated standoffs, electrolytic while the make it of even greater value. kilowatt-hour meter PCB assembly is 1 0.1µF greencap mounted using 8mm insulated standoffs. 1 0.068µF greencap 1 0.001µF greencap Calibration 1 10pF ceramic ONLY The kilowatt-hour meter is calibrated RESISTORS using a high power resistive load such as $4.50 2 x 1 M12, 7 x 100k12, 1 x 82k9, 1 x a 1000W bar radiator. Since the average + 90c 56k2 1 x 6802 1000W radiator will not draw exactly MU p&p MISCELLANEOUS 1000W, the power consumption of the Machine screws and nuts, 240VAC radiator must be calculated before hookup wire, solder etc. calibrating the kilowatt-hour meter. FOa. /MUM f4 in PLUS: All the parts listed for the This may be done two ways. The first Available from "Electronics Australia", 57 wattmeter in the September issue, method involves measuring the voltage Regent St, Chippendale. PRICE $4.50 OR by except for the case and the across the radiator and the current it is mail order from "Electronics Australia", PO Box drawing from the mains while at 163, Chippendale, 2008. PRICE $5.40. Scotchcal front panel. operating temperature, then multiplying

84 ELECTRONICS Australia, January, 1984 the two figures together to get the power consumption (P= I.V.). For example, if the voltage is 238V AC and the current is 4.3A, the power consumption will be 1023W. The second method involves measuring the voltage across the radiator then unplugging the radiator and quickly measuring the resistance of t the hot radiator element. The power consumption of the radiator is then calculated by squaring the voltage reading and dividing this by the resistance reading (P = V2/R). Of the two methods, we prefer the latter since it is easier to measure resistance than current consumption. But whichever method you use, it is essential that all measurements be carried out with the radiator element at normal operating temperature. This is because the resistance of the element increases by about 5% as the element goes from room temperature to operating temperature. In particular, the resistance reading should be taken quickly once the radiator has been unplugged so that + the element does not have time to cool. Oncé the radiator power consumption has been calculated, it should be used to check the accuracy of the wattmeter circuit which may have lost calibration during the transfer to the new case. If the wattmeter has lost calibration, it should be recalibrated using the procedure outlined in the September issue. o The kilowatt-hour meter is now calibrated by adjusting VR5 on the + - wattmeter PCB. As before, this adjustment must be made using a screwdriver with a fully insulated blade. Adjust VR5 so that the LCD reads 1/10th the calculated radiator power consumption after a period of six minutes. An example By way of example, if the calculated radiator power consumption is 1023W, then the display should read .102 after z six minutes. Once this initial adjustment r- has been made, more accurate adjustments can be made over longer o periods of time (eg, for the above example, the display should read 1.023 after 60 minutes. Don't forget to press the "reset" button at the start of each measurement period. If, due to circuit tolerances, VR5 does not have enough range to allow o calibration of the kilowatt-hour meter, it C should be replaced with a 1k1 trimpot. When using the kilowatt-hour meter, it cn is important not to alter the setting of the range switch (S1) during the measurement period. If you do, the different counting rate will invalidate the reading. However the wattmeter range may be altered since this,does not affect the output frequency of the CCO. 2 cc MAIL 'ORDER - MAIL ORDER MAIL ORDER

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- 4 11.114101110ESA11vR114GttM1)1401«. W ALL PRICES INCLUDE SALES TAX Adjustable Azimuth CS-15SUAn 130mm DUAL -TRACE TRIGGERED DATA CASSETTE $45 last a O SWEEP OSCILLOSCOPE di At Data Cassette Bandwidth Recorder/Player you can DC - 15 MHz i afford. The Micron D 1120 Sertsrnesty 10 mV/dry is fully Sweep ate`=, adjustable azimuth J T''11. 0.5 s/din - 0.5 shin, _ t C10 Data Cassette (absolutely essential in our áu,4 ;l,, Tape $1.10 opinion) and incorporates $540 +$10 Freight C20 Data Cassette tailored audio frequency A Tape response vortical amplifier provides as wide a bendw,dth as DC tO 15 MU, $1.20 audio stage s high a sensitieuv as 10 mVJdiv. and a low input capacitance e A sweep together with low distortion. rate extends from 0.5 ¿sec/div to 0.5 sec/dlv in 19 ranges Further, Now you can save and load TV vertical and horieontal sync, are available for measuring video software in your Micro ,lanais and, with its a5 magnified sweep, its range of application is extremely wide Very easy x.Y operation Of high input sensttivily MICRON 12 with confidence. for Lissalous measurements Dimensions: 2601,1 a 19011.1) x 38510) mm; Weight: 8.4 kg Green Phosphor Monitor Features: 12" screen. Front controls, on oft, contra st/reverse. bright. VERBATIM ness, Power: 240V1 POST ANO PACKING CHARGES. 50Hz or 12V DC. Input. VEREX RCA type. DC Output W ORDER VALUE P&P 1 Jack: 12V/1.1 Amp - 12 MONTH WARRANTY power your Micro direct 35 . $999 3I.00 POST 6 PACKING 51/e SOFT SECTORED without a power pack, FOR GOODS SENT 510 ' 524'99 12.00 Bandwidth: 10Hz to BY STANDARD 825. 54999 32.50 $35.00/10 20MHz the resultant MAIL IN S50. S99'99 definition is truly AUSTRALIA 53.00 ONLY amazing for a low cost o $100 OR MORE 53.50 S -Side monitor. Double Density J MAIL ORDER ONLY (NO SHOP SALES) SQ '. PRICES CORRECT AT S'`ES TIME OF PUBLICATION SOLDER SUCKER BUT SUBJECT TO CHANGE Quality de -solder tool with Teflon WITHOUT NOTICE; tip and nozzle sweeper. 'f ells co $8.75ea - lEVpCE pó REPLACEMENT TIP *y0``Q OP" BANKCARD E`satPP`0O VIA YOUR VóálÉpl3pPa4?PtP PHONE $1.25ea

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-ca AITYwa- ALl11TR 12-240V POWER I raDtNE`Gs 5612103 $199.50 o`'So W I 1 0404/seUNttS These great inverter kits enable you' 1 tOVCHPRE.O LP ,tAEitAL .. a OF + _ to power 240V appliances from ` 12V DC power source. Tremendous Nplf Tj 1,$19.9á for camping, fishing etc. Install Into .- , your Car, Boat or Caravan: A fully regulated and overload protected design, featuring XTAL locked frequency. Use to power hl -fl, TV sets, even electric drills for short time periods. MANY OF THESE KITS ARE NOW IN USE FOR EMERGENCY LIGHTING PURPOSES. KIT features o Gold plated edge connector PCB o Low age rate XTAL o Sockets pgrIrPOOTerÓeW aWh cVó and Muss styti t( for air IC's **Nigh Efficiency Transformer. sp9aóe a erüeCt IN la p

I Ii _ M _Th'1C0aeso 11 TWO GREAT 44 WATT MODELS - PROGRAMMEí°~', 0 1$55/ a.o

GENERAL PURPOSE FLUORESCENT LIGHTING Sults small appliances. le. Turntables. Tape Decks. Operates above Me audible frequency range and Shavers etc. Variable frequency adjustment is capable of driving one 40 watt or two 10 watt enables speed control of turntables. works as a fluorescent tubes to 150% of their normal 240V ef- ttickle charger when mains power is available. ficiency install permanently Into Caravans. COM- EASY CONSTRUCTION VALUE PLUS FILMDOMFLRE KIT. INCLUDING ALL WINDING WIRE. t ETI JAN'83

Versatile, low cost and easy to build. Plugs, $55.00 537150 straight Into the mitrobee I/O port. Suitable for 2716, 2732, 2532, 2732A and 2764 Eproms. Burn your games programmes and eliminate cassette, loading time. KITS KIT FEATURES a Sockets for all other es o 1 x SATURDAY ARVO 2716 supplied.- get started straight away a Front RADIO MIC Panel and Mains (SEC approved) transformer a 28 K1106 $6.50 pin and 16 pin wire wrap sockets to flush mount o personality plugs (2 Included) and 2IF socket (In. ALIEN INVADERS cbolt.iuded) o D815 Plug * Complete to last nut and K1123 $13.95 Transistor Tester SOK1492BENDER $29.550, OFF NPH/P-ch BIPOLAR 111 COURTESY432 LIGHT EXTENDER"$3.955 ON EA LM 317K PROJECT (9 V PO`RVEdywrorkshoD school and hobbyist ON PNP/N-di FET 0)? should get one fowl ' GAIN TEST l i) SOUND EFFECTS PACK $17.50 K1607 POWER SUPPLY (CONTAINS PARTS FOR ALL 5 PROJECTSI A Electronics Australia Project. Tests Bipolar ACTIVE NOW STOCK Transistors, Diodes, Pets, SCR's and PUT's. Excellent service aid for the hobbyist and FULL RANGE OF KITS serviceman. Complete kit and instructions. K 2525 PHONE FOR FURTHE;s

DETAILS OF KITS Overload and short circuit protected. Full voltage and current metering. $19.75 AVAILABLE 3-3 olt output at 1 AMP. $39.95J 1POUses LM 31 7 K variable regulator. Full instructions and every last part included. I * Prepunched and screened front panel, no DIGITAL FREQUENCY METER or filling required. * Bright high efflc- See Electronics Aust. Mag. Dec. 81-1-eb. '82 drilling lency 7 segment display. * Frequency ranges 500 MHZ, 7 DIGIT RESOLUTION PLUS 0-10 MHz 0-50 MHz, 10-SOMHz (with optional maaLcaaacfac, PERIOD MEASUREMENT FEATURE Pre -scaler) * 4 gating times - ql , .1 , 1 , 10 vtts seconds. * 4 period measuring ranges 1, 10, 100 and 1000 Input cycles give 0.1 uS resolution. MHz, pigrrJJ F1iÉgIDINcy MLtEP 1 High input sensitivity - 10 mV to 30 100mV at 50 MHz Ia 1M input Impedance, 200mV at500MHz@ 75 ohms input impedance. L I2Iy3 18y' * High accuracy - typically better than .005'4/ count uncalibrated. Costs a fraction Of commercial Counters. ( / EXCLUSIVE KIT FEATURES: * IC sockets provided throughout. DIGITA. IMPORTANT NOTES: * Low aging 10,000 MHZ XTAL. CAPACITANCE METER r heatsink for SV regulator. (I) This project Is well within the scope of the Thermalioy Electronics Australia Project. Measures I PF "not so experienced" as virtually all components Quality Pactec Instrument Case with tilting 1 99.99 UF. 140V Mains Powered. Bright LED are contained on a single PCB. ball. Display. Easy to build. Complete kit of parts and full instructions. (2) USE ONLY THE SPECIFIED K 2500 (50 MHZ version) INTERSCIL LSI - BEWARE OF INFERIOR K 2520 KITS THAT DO NOT CONFORM TO THE K 2501 Pre -scaler .... ORIGINAL DESIGN. (add for 500 MHZ version) MI MI ----as MAIL ORDER MAIL ORDER MAIL ORDER always been switched off at the power point and the plug removed. The active L tt t pole of the switch in the TV set has not been subjected to continuous electrostatic stress with every voltage spike on the mains adding its the to the ultimate breakdown editor contribution of the insulation.

Last year I wrote a letter to you Design standards and television fires advocating total disconnection of electronic equipment from the mains

I read your October article on fires in This is a 2 -pole switch; and it is when not in use, and you published it TV sets with some alarm and interesting to note from the illustrations under the heading "super pessimist". My immediately checked on my Blaupunkt. in your article that only one pole had pessimism is based on sound The switch is exactly as described in your burnt out. (The same current has to flow engineering knowledge and experience.

"Serviceman" article. However, on close through both pole contacts.) I suggest I wonder how many more badly inspection I was much relieved to find it that this would have been the pole designed mains switches there are in in very good condition. That set has connected to the mains active. The other electronic equipment, because the been in service since December 1975, pole connected to mains neutral appears electronic designers do not have the and it has been switched on at least daily to be intact. necessary knowledge of dielectric during that period. The contacts are still I agree that the electrical design of this phenomena, to design for a suitable set very firmly in the plastic insulating switch is not good, but I attribute the safety factor. strip. long life of the switch in my TV set to the H. L. Harvey, This leads me to suggest that your fact that when the set is not in use it has Cairns, Old. serviceman's first diagnosis is correct, and that the failures he has observed are fundamentally of electrical origin. Electrical engineers familiar with electrostatic field patterns and stress VCR fire information wanted distribution in insulation materials are I am prompted to write by your Not only would it help in my, and aware of the problems of stress article on TV fires. In July of this year baby daughter's, claim for damages, concentration at the interface of a sharp my video recorder caught fire and but if it turns out to be a dangerous cornered conductor and the surrounding claimed the life of my wife. unit perhaps another tragedy could insulating material. Normally stress The inquest has not been held yet be averted. concentration is significant only at high and all I know is that it was caused by If you're interested I would send voltages, but with the small insulation a faulty component. It is highly you relevant details from the police spacings used by electronic designers, unlikely that it was being used at the report when they become available. 240 volts should be regarded as high. time and was in the standby mode If you, yourself, cannot help, . then This switch is a typical example of just only. I was in Melbourne at the time. perhaps you could publish, in part, that. Leakage due to dust pollution, I am anxious to find out if there have my letter and others readers could help with their experiences. moisture , etc will cause greatest been other occurrences or faults deterioration of the plastic insulation in likely to cause fire in VCRs. Do you F. Matzka, Morphett Vale, SA. the immediate vicinity of the contact know of any design shortfalls or COMMENT: Readers with information electrode, with consequent loosening of "cheap" components? I would deeply on this subject can contact Mr Matzka the contact in the plastic and the later appreciate any help you could offer. via "Electronics Australia". symptoms which resulted in burn -out.

101 ELECTRONICS AUSTRALIA SPECIAL OFFER ON LIMITED STOCK

Number 2 $2 POST PAID

AUDIO PROJECTS: Loudspeaker protector CB PROJECTS: Powermate: 13.6V supply POWER SUPPLIES AND POWER for Hifi systems, digital metronome with for transceivers, preamplifier for 27MHz, CONTROL: Speed control for electric drills, accented beat, remote TV headphones, shortwave converter for the 27MHz band. fully protected, regulated power supply, toroid filter cuts radio/TV breakthrough, moodlighting with the varilight Mk 2. simple mixer for pick-up and microphone, MISCELLANEOUS: 10GHz radar burglar universal headphone unit, active filter unit for alarm, model train control with simulated CIRCUIT & DESIGN IDEAS: Hee-haw siren crossover networks, voice -operated relay. inertia, multi -band vertical aerial, an for toys, model train signalling system, electronic roulette wheel, an in -circuit microphone preamplifier, temperature transistor tester, modular digital clock, novel actuated switch, water level alarm, two- AUTOMOTIVE PROJECTS: A control unit for "Leds and Ladders" game, simple proximity phase CMOS clock oscillator, economical intermittent wiper action, an upgraded switch for a novel door chime. crystal oven. capacitor discharge ignition system, a dwell meter for engine tune-ups, tacho for tune- from "Electronics Australia", PO Box 163, ups, a trafficator repeater for caravans and Available trailers. Chippendale 2008. PRICE $2 post paid.

ELECTRONICS Australia, January, 1984 89 This versatile direct connect modem is based on a new special purpose integrated circuit and supports full duplex 300bps (TIT, AVTEK MULTI MODEM and half duplex 1-00 FQ 1:00

600 and 1200bps, 300 ANSI/.

r 30) DOUG operation to both 31.411 the Australian boo AUTO ó, . d CCITT and the TSRACXEO(X --1 OCD R RT3 i'rS rX0 EXTERNAL US Bell standards OhhrCT RECEIYS IR 41SA11T RING rEST KRrER

Data communication- is one of the line, radio link or intercom cable. One in bits per second (bps), although the fastest growing areas of computing, both audio frequency is selected to represent term "baud" is often used inter- in the personal and business fields. a logic "0" and another to represent a changeably. Strictly speaking "baud" Communication between computers "1", a process known as "Frequency Shift refers to the number of signal transitions allows near-instanteous transfer of Keying" (FSK). The device which does this on the communications line, rather than business information between widely conversion is known as an FSK modem. the amount of data represented by these scattered sites, allows programmers and "Modem" is a combination of the transitions. In some cases, a single students to work from home with a words "modulator" and "demodulator". change of state may represent multiple termihal connected to a remote At one end of the line the digital signals data bits, and therefore the data computer system, and lets hobbyists are modulated onto an audio carrier transmission rate will be higher than the swap programs over the telephone lines. tone for transmission over 'the voice - baud rate. We'll use "bps" throughout. The .number of dial -up information grade link, and at the other end the Modems capable of transmission rates services and computer bulletin boards received audio tone is demodulated to of up to 2400bps are generally classified also seems to be increasing each month, recover the digital information. as "low speed". However, the 3kHz with new announcements by com- Modems are categorised by the speed bandwidth of voice-grade telephone mercial service organisations, com- at which they transmit and the frequecy lines means that these are the only puter distributors and an increasing of the tones used to represent the digital modems which can be used over the number of computer clubs. If you don't data. public phone network. Higher speed mind running up the telephone bill there Data transmission rates are expressed modems require the use of "dedicated" are also the attractions of networks in lines which are leased from Telecom. other countries, such as the US Table 1: Operating Modes We won't consider this type of Compuserve system. equipment. The device which makes all this Mode Rate Duplex Description possible is' the "modem", the link (BPS) Data transmission between the digital world computers of 1 300 Full Bell 103 standards and the telephone system. Originate 2 300 Full Bell 1.03 To allow data communications between diverse equipment, standards Why use a modem? Answer 3 1200 Half Bell 202 have been set for transmission rates and The logic signals used in computers 4 1200 Half Bell 202 with the frequencies of the audio tones used. (typicaly 0 and 5V) cannot be sent more equaliser Two sets of standards are in common than a few metres over cables, and even 5 300 Full CCITT V21 use, one from the International with the ±15V signals of the RS232C Originate Consultative Committee on Tele- standard, transmission distances are 6 300 Full CCITT V21 communications (CCITT) and the other limited to a few hundred metres. The Answer the Bell Telephone standard. The CCITT attentuation of signals over a long cable 7 1200 Half CCITT V23 standards are generally used thoughout run combined with injected noise and Mode 2 Europe and Australia and the Bell interference from other sources will 8 1200 Half CCITT V23 standard is used in the USA. quickly degrade a square wave signal. Mode 2 with For 300bps transmission the relevant The alternative is to convert the logic equaliser standards are the Bell 103/113/108 and signals to bursts of tones which can be 9 600 Half CCITT V23 the CCITT V.21, while 600 and 1200bps transferred over any medium that can standards are designated. Bell 202 Mode 1 and pass an audio signal, such as a telephone CCITT V.23.

90 ELECTRONICS Australia, January, 1984 by PETER 1. VERNON

41.

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400111111 f - t .4414 fif S. `'. el Mi wia / y / /. ZWJ ` Woo AL7M4/115 .. h " -f i i%141 irr J ,fi /. ",f ai! .. ñf' o f f fW4 rf , nt/á»3tiF,ia/ .. {t i t1 !R t t t fSME)t h} y ixMnitírttJ IL" a04r. nai..rti

ifitafiNe; . . Yifjtif +a....:4 _.. , Z '- i

Since communications usually involve zeroes and ones as tones of 1850Hz and There are a number of minor differences transmission of data in both directions, a 1650Hz respectively. At the "answer" between this prototype unit and the pro- convention has been established to device, the receive and transmit duction models of the modem (see text). prevent the two sets of data interfering frequencies are interchanged. with each other. One of the pair of The two sets of frequencies allow data The AMD World Chip communicating modems is arbitarily to be transmitted and received called the "originating" party and the simultaneously at 300bps, a mode of Until recently, modem equipment has other the "answering" party. These operation called "full duplex". The higher either been complex and unwiedly to designations do not necessarily conform bandwidth of 600 and 1200bps construct and align or has been capable to the actual role of the parties in the transmissions on the other hand, does of using only a limited number of data communication process - all that is not permit full duplex operation - data transmission formats. The most necessary is for one of the pair to call is handled in one direction at a time, or complicated and troublesome parts of a itself the answerer and the other the "half duplex". modem are usually the filters used to originator. A limited form of full duplex operation separate and condition the transmitted Under the 300bps V.21 standard the is sometimes used however, with the and received audio tones. "originate" device transmits a logic 0 as a main transmission operating at 1200bps This new direct -connect modem a 1180Hz tone and a logic 1 as a 980Hz and a "back channel" working at changes all that. It is based on new tone. The originating end also receives 75bps for verification of data. Continued on page 95 ELECTRONICS Australia, January, 1984 91 1 1

microbeé

VIPER

VIPER SWORD QUEST A highly addictive game. You must Just like the `Dungeons and Dragons' eradicate the rabbits before they series. Select your characters level of reach plague proportions but each armour, weapons, strength and skill. iktime you catch a rabbit your tail Explore in search of treasure and the grows. Great Sword, and battle with the $14.95 Cassette Diskette $19.95 dungeon's creatures. MONOPOLY $14.95 Cassette Diskette $19.95 Now a full graphic version of the old FROG HOP family game of the same name. The A most graphic variation of the entire board, players, Community popular arcade game. You must hop Chest and Chance cards are displayed across a busy street (watch out for as required in this fast moving game. the trucks ...) and across a crocodile Full details of land ownership and infested stream before your frogs are finances. Supurb graphics and sound safely home. Guaranteed to appeal to effects. (Requires 32K). all ages. $14.95 Cassette Diskette $19.95 $14.95 Cassette Diskette $19.95 AM NAVE tu"I1R0

SKETCH PAD Use the high resolution graphics in your microbee with this most effective drawing aid. Ideal as an introduction to Cad techniques and you can create complex shapes with a little WORD ADVENTURE ROBOT MAN '84 practice. You can also 'trace' from images A powerful and gripping educational program. Now one of the most popular games ever taped onto the screen to generate faithful Follow the trails by solving problems involving written for the microbee has been rewritten reproductions. Have you ever wondered how homonyms, synonyms and antonyms. Various option. with new twists, a joystick and colour programmers create the graphics for their creatures will meet you along the trails and Cassette 514.95 Diskette $19.95 software? give you clues to the words you seek. If you MICROSPACE INVADERS '84 Cassette 514.95 Diskette $19.95 make too many errors you will certainly have New update of one of the original microbee CHOPPER PILOT to face the spelling serpent who will test your games. with and joystick Now full colour Fly your helicopter through a small city and a fate. Once you master the first game you will option. Sound and speed controls. Turn your series of mazes without crashing into the learn a password which will enable you to load microbee a home machine. into arcade scenery. Has a training mode as well as the the next secret program. (Requires 32K). Cassette $14.95 Diskette 519.95 real thing for those who want to practice first. Cassette $14.95 Diskette $19.95 SCRAMBLER Now with joystick option. 'BEE' CASINO A full colour version of the popular arcade Diskette $19.95 Cassette $19.95 Another value package with a collection of all game. You are the sole surviving defender of GENIUS AND INSANITY the popular gambling/casino games written for earth and you must destroy the aliens at all Yes, those insanity blocks are back! The game the microbee. No need to take the wife to Las cost very effective colour graphics (also ... has several levels of difficulty but really serves Vegas or Wrest Point! This makes ideal party suitable for non colour microbees). as a vivid demonstration of the microbee material for after the kids go to bed. Cassette $14.95 Diskette $19.95 colour graphic capability. Cassette Library Pack 539.95 EYE OF MIN Cassette $14.95 Diskette $19.95 Diskette 539.95 A graphic adventure game that will absorb CHESS/CHESS TUTOR BEE SCIENTIST: Physics and Chemistry you for hours. If you can solve this excellent For those who enjoy a serious graphics game Laboratory. A collection of practical mystery then you can proceed to the next saga it is hard to beat Chess. If your game needs experiments and courses on physics and 'Sabre of Sultan'. (Requires 32K). improving try the tutorial first. You can select chemistry. You can study chemical equations, Cassette Diskette $19.95 $14.95 from 6 levels of play and these can be altered valency, Kepplers laws, Coulombs Laws and ELECTRONIC HOBBY MATE during the game. This program features very Milliken's experiment. A valuable teaching aid A real first. This clever program deals with good graphics and, particularly at the higher now used in schools. resistors, capacitors, electronic terms and play levels, becomes a most worthy opponent. Cassette Library Pack 549.95 must contains a wealth of 'live' information. A (32k microbee recommended). Diskette $39.95 for all experimenters. Your microbee will Cassette $14.95 Diskette $19.95 become a useful design aid. TARGET/TREK Cassette $14.95 Diskette $19.95 These are two of the 'classics' of computer TUTORIAL: Touch Typing Tutor and Bask games and will still impress with the use of Tricks. The microbee is an ideal educational characters to emulate graphics (remember they computer recommended by educational only had teletypes on the 'old' days around authorities across Australia. This package even E DEtiw 1976). The challenge of Trek will attract FÓ SO 1A enables you to learn to touch type using the the most ardent 'anti games freaks'. Otdets Pitman touch typing method. For those who Cassette 514.95 Diskette $19.95 want to master Microworld Basic there is a LEARNING CAN 'BEE' FUN tot D series of hints and suggested subroutines Now the full series by John Grimley in one arranged in a most effective menu driven style. value package containing 6 cassette tapes (or 1 Cassette $14.95 Diskette $19.95 diskette). Utilizing well known games such as RING OF DOOM 'Donkey Kong', 'Frog Hop' and 'Rescue' you Ask your nearest microbee dealer for a Your quest is to search for the Dark Lord of can enjoy the game and learn at the same catalogue of over 100 microbee programs now Saurean's Ring of Power. This action adven- time. available on cassette, diskette and ROM ture game will operate in a 16k microbee. Cassette Library Pack $49.95 covering applications in education, games and Cassette $14.95 Diskette $19.95 Diskette $39.95 utility functions.

microbee computer shops bonNcord welcome here DIRECT ORDERS PHONE (02) 487 2711 APPLIED TECHNOLOGY 1 Pattison Ave, 729 Glenferrie Rd, Cooleman Court, 141 Stirling Highway, Waitara 2077. Hawthorn 3122. Weston A.C.T. 2611. Nedlands, Perth. RETAIL Phone (02) 487 2711 Phone (03) 818 2244 Phone (062) 88 6384 Phone (09) 386 8250 PTY LTD Authorised Dealers: NSW: Ja

5 3 2 13 C CTS +5V ® IC5a 5 2.4576MHz PHONE 12 XTAL R9 6 11 15 4.7k BRX BAD 3 ®13 I C12 IIREIAY 1488 IC5b X1 *3 3 2 4 26 120pF RD 24 "ID XTAL IC10c d 0pFTy .L C13 ¿ +5V O 02 IC3e 12 EXTERNAL 90110 GND(>~_ D9 12 15 20pF DIAL 'D10(T, p11 g CLOCK +5V INPUT '--C7 O IC5e Ii D4 021 2a1N9141v + 5V 1N914 IC9a IIIRELAY +9V -9V IC6d IS /4894 3 D5 116 TXD R21 RELAY it 13 62 O D RB B 1N914 O 618 1.z 1413 1000 476 Cl Cfib 'Clod C4 022 DIAL OFF NORMAI 470pF 01 !4.76 j_..._ O 03 ICºd Li"i I BC1o8 5a4 28 +5V t BTXD014 13C),0I1 BID IC9c 7.5V 12 R7 2 RTS O4 RTS 10t).08 IM IC4a +9V IC10a 74LS00 11 RESET O BRTSOI1 BRTS OV t>03 C6 240VAC 7805 +5V 1489 IC9b .047TI 46 16 OTR 020 DTR 7 C15 C14 C2.C3. R12 1000C18+C20000 1 T , 0.1 C1D,C11 112 2 4 4.7k 7.5V 10kR3 106 +5V T R18 R17 C16 DSRO6 S3a 3300 C19 +y C17. 3300 52 1000 0.1 L 2 T 1

7 05 5V +5V -U0 The circuit diagram of the Multi Modem. Note 9V AVTEK MULTI MODEM that R30 and R31 are not used. R29, 2ICCI Versatile multi-standard modem Continued fro page 91 integrated circuit from Advanced Micro and received signals are on different Devices, the Am7910 "World Chip". All Design and availability frequencies, the transmit signal will the major functions of the modem are overload the receiver input if it is at too performed by this chip, with 10 other The "Multi -Modem" was high a level. commonly available ICs providing designed by David Griffiths and Provision has also been made for the interfaces to the computer and data Geoff Radcliffe and is available transmit and receive signals to be transmission line. Nine different data exclusively from Avtek Electronics connected to separate lines via the transmission standards are supported, Pty Ltd, 1 19 York St, Sydney, (02) auxiliary connector on the modem PCB. including the CCITT V.21 and V.23 267 8777 or 172 Liverpool Rd, This option allows "four wire" operation 300bps and 1200bps formats and the Enfield, NSW (02) 745 2122. and can be used if two wire pairs are Bell 103 and 202 standards. Enquiries in writing should be made available (in an internal intercom system, to PO Box Victoria A data bit received from the modem is 0302, Queen for example) or if two radio channels are translated into the Electronic Industries Building, Sydney, 2000. Cost of a being used. Using four wire operation kit, including Association (EIA) standard known as complete case, front permits transmission in both directions panel and all parts is RS -232C. This standard defines a 0 as a $229. simultaneously at 1200 baud. voltage level between +5V and +15V The mode control inputs to the and a 1 as a level between -5V and used to isolate potentially dangerous Am7910 are in BCD (binary coded -15V. Voltages between -5V and +5V voltages from the telephone line and decimal) format. IC2 is a priority encoder are undefined. also to match the modem output to the which produces the appropriate BCD communications line. code for one of 10 inputs selected by the The circuit panel rotary switch. Nine To allow a computer connected to the front The circuit of the modem can be modem to answer the telephone communications formats are available, as listed in Table 1. Also available is a divided into four main sections. These automatically it is necessary to detect function and an "external" position are: the incoming ring signal. When the test which disables buffer IC3 and allows The line interface which provides modem is connected to the line, the ring codes to be supplied by an external relay switching to loop the com- signal is passed via a 2.2µF capacitor and up the possibility of munications line, detection of ringing the isolation transformer to diode D1. device, opening using some of the less common formats signals and, most importantly, DC This diode rectifies the ring signal and supported by the Am7910 World Chip. isolation between the modem and the charges a 11..iF capacitor until the input of communications line; NAND gate 4b is taken high. The output An analog section which handles of the NAND gate lights the "Ring" Computer Interface modulation and demodulation of the indicator LED on the front panel of the The World Chip uses TTL levels, and audio tones. This is carried out by the modem and drives the RI input of the although these could be connected Am7910 (IC1) and operational amplifier Am7910. directly to a UART or similar device in IC11; the computer, 5V levels are easily If ring detect is not required a link on noise when transmitted over A computer interface which converts the printed circuit board can be changed affected by a metre of cable. In data and control signals to and from the to ensure that the A relay only operates more than about order to simplify connection between modem into RS232C levels for when the L relay is closed, so the 2.2µF modem and a TTL connection to a standard serial interface capacitor does not appear across the the computer, the RS232C as provided on most computers. Once line. levels are converted into signals. The actual conversion of TTL levels to again, this task is carried out by the All of the timing functions of the Am7910 (IC1); RS232C signals is performed by MC1488 modem are controlled by an on -chip A power supply, which provides ±5V RS232 line drivers (IC7 and IC8) and oscillator which requires either a crystal for the analog and logic MC1489 line receivers (IC9 and IC10). control circuits or an external clock frequency of and a nominal ±9V for the RS232C Connections between the computer and 2.4576MHz. The auxiliary connector on interface section. the modem are via the standard RS232C the PCB has provision for the connection 25 -pin D -type and are as The incoming communications line is connector, of an external clock input if this shown on the circuit diagram. switched by relay "L", which determines frequency is available from elsewhere in whether the modem is connected to the the system, in which case the crystal Power line. The operation of this relay can be must be omitted. Supply controlled manually by the front panel The Am7910 requires regulated "connect" switch (52) of the modem or supplies of ±5V, with ±9V used for the by the computer by the Data Terminal Analog functions RS232C drivers. These voltages are Ready (DTR) line of the RS232C interface. Modulation and demodulation of the supplied from a 15V centre -tapped In the centre "off' position, the front audio tone signals are performed by transformer via a bridge rectifier and, for panel switch prevents the modem being the Am7910 chip and the receive and the 5V lines, three terminal regulators. connected to the tine, regardless of the transmit amplifier -formed by a 1458 dual The ±9V supplies are not regulated, but state of DTR. op amp (IC11). The transmitter section of considerable attention has been paid to Relays A and B allow the computer to this circuit (IC11b) amplifies the signal filtering and bypassing the supply rails to dial a number. To dial, the B relay is from the 7910 to drive the com- ensure stability. closed and the A relay (which is normally munications line while the receiver As designed the PCB allows the use closed) is pulsed by the computer in section (IC11a) couples the incoming either a Ferguson or Arlec PCB mounting accordance with a preset pattern to signal from the line transformer to the mains transformer or input from an simulate the action of an ordinary rotary 7910 while also attenuating the external source of AC, such as a dial. unwanted transmit signal fed to the plugpack with a centre -tapped 15V A 60011 to 60052 isolation transformer is receive input. Although the transmitted output.

ELECTRONICS Australia, January, 1984 95 Versatile multi-standard modem The LEDs on the front panel indicate The photographs of the modem are of with one set of pins in contact with the the status of the power supply, the test an early prototype unit and do not show fingers on each of the upper and lower switch and RS -232C interface lines for this small PCB. The prototype also shows sides of the PCB and is soldered in place. Ready To Send (RTS, from the terminal), two trimpots on the board which in fact Check the placement of the board in the Data Terminal Ready (DTR, from the have been replaced by fixed resistors in case by pushing the switches hard up terminal), Clear to Send (CTS, from the production units. against the front panel and positioning modem to the terminal) and Data Carrier There are 10 small signal diodes and the DB-25 connector so that it is flush Detect (DCD, from the modem). Two two zener diodes on the board. Some of against the rear panel before soldering other LEDs on the transmit data and these are mounted vertically, although the pins in place. The switch mountings receive data lines'are provided to verify shown as horizontal on the parts and the screws in the DB-25 connector correct operation of the modem. overlay. The orientation of these diodes hold the circuit board in place. must be watched carefully. Note that the Sockets are provied for all ICs and Construction pull-up resistors for the rotary switch should be used. Take care when handling the modem chip itself. It is an Construction of the modem is inputs and front panel LEDs are supplied NMOS component and is sensitive to straightforward. Avtek Electronics will be in the form of a single -in -line package static electricity. At around $70 each, supplying a complete kit of parts, which is mounted with the indicator dot incorrect handling could be an expensive including a front panel, pre -punched to the left front. mistake. The Am7910 should be the last cabinet and a double -sided printed The voltage regulators, electrolytic and component mounted on the board, and circuit board with plated-through holes. tantalum capacitors and encapsulated then only after the board has been Connections to the board are made to bridge rectifier are also polarised and checked and correct power supply PCB mounting terminal blocks and the must be mounted as shown by the voltages verified on the pins of the DB-25 connector, while rotary switch S1 component overlay diagram. 28 -pin socket. is mounted on a smaller PCB which in The DB-25 connector supplied is a turn is soldered to the main board. wire -wrap type. It slides onto the board Continued on p128

Component placement is as shown below. VR1 and VR2 are the +5V and -5V voltage regulators respectively.

E A Pt LINE PHONE E ti 0 0 S o 0 o .r1 0 0 0 MOW(Jut::! IiJ'J'jJhI .r-._...._. M 1' R2 0. CSD9 .. o 010 D11 o o 012 o O;C7 8 ---0 V O o

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' ETM

(CO. RX AVTEK ...... -,__.._ W1RE .." ' (ELECTRON ICS) Ply. Ltd. .., --.. 4' ..... f JwY ev /Q ..`-'-".(14 O C11 .r TX ---. (C11 - SW2 _...... _rw- SW3 { +....,, ...._.y,._..-. R3%39 .._.... ._.V.`_ -R16-_ -'a R16 \ /.-- ...... -J F )_!t q_v.r'I1 _DR 13 -^..' {.J SWlfstiia+'eÍiii- IR12fl_: 0 0 w 41 O 17 R171 I ETEK * O LED1 vLED210ED3 OLE04oLEDELED6 IILED7 0 0

96 ELECTRONICS Australia, January, 1984 No 2 WE TRY HARDER.., MULTIPROM INTERFACE S

KIT MICROBEE

atulnaov

4.4.4 3' 1'' ,r h 'E_3.°

SEE ETI NOVEMBER 1983

XM-1 - This is a totally new product developed EXCLUSIVELY (or AVTEK - It takes two sets of EPROMs (e.g. WORDBEE and EDASM) and allows you to choose between Hum by simple KEYBOARD COSISI ANDS. It will take a short time to assemble and is simply installed MULTI ROM Inside the MICROBEE with one DIP plug (supplied) and two solder connecuons. XM-I - sults early model MICROBEE plus models using 2532 type EPROMs. These have serial numbers starting with 8 - ONLY 519.95 BOARDS XM-2 - same as XM-I but suits the 'MICROBEE IC' and is even simpler to fit. Also responds SPECIAL to PAKI and PAK2 commands. These have serial number starting with 9 - ONLY 516.95 $15 each JAN ONLY PCB Manual and ROM See ETI Oct 1983 - $149.00 FULL KIT $450 Jan Only Save $25 CP/M in 8" or 51/4" 1200 or 9600 Baud LITTLE BIG BOARD (please specify) ONLY $150

SPECIALS 20% SAVING t XLR CONNECTORS (CANNON TYPE) AVTEK MULTI 3 PIN 5 PIN LINE MALE 52.80 LINE MALE 55.20 LINE FEMALE 52.80 LINE FEMALE 56.00 MODEM CHASSIS M ALE 52.56 CHASSIS M ALE 54.40 CHASSIS FESIALE 52.80 CHASSIS FEMALE 55.20 See EA Jan 1984

ONLY $1.99 EXCLUSIVE - ONLY $229 COMPLETE KIT

IEC MAINS LEADS - NO MAINS PLUG - OVER I METRE - DON -I PAY 53.95 - ONLY SI.99 LIMITED STOCK.

EURO CASE Stone GREEN LED's 10 FOR 51.00 - TIIAT'S ONLY - .. AYTEI( MULTI MODEM PURCHASE 10 CENTS EACH!! tal i SCOOP LOGIC PROBE AND UNIVERSAL PROBE BOTH SAVE 4 UNIT HIGH IEC STANDARD RACK ENCLOSURE REDUCED FROM 59.50 TO 55.95 EACH VENTED NOTE: THIS RACK SUITS THE APPLIED $3.55 TECHNOLOGY RACK S-IOO CARDFRASIE HAS BEEN SOLD FOR 5189 - NON ONLY 599.00 60 - 160pF TUNING CAPACITORS AS USED IN TRANSISTOR RADIOS AND LOTS OF OTHER PROJECTS - ALSO IIAS SECOND GANG FOR FM 2 for $1.00 S -I00 SOCKETS 2 FOR 51.00 High quality, gold plated 56.95 ea or 10 for 565 2716 EPROHIS ONLY 53.50 EACH NEW PRODUCT RIGHT ANGLE MOUNTING LED HIGH QU SLITY AUTE1C t%e hear- of HEWLETT P eCKARD AS USED IN AVTEK MULTI KEYBOARD SWITCII'BUTTONS MODEM - COLOURS. RED. GREEN. YELLOss WITH BLANK TOPS - ONLY 51.00 DONT I'AV 51.40 ONLY 99 CENTS EACH n5110N- ALLEY° SPECIALS FOR JAN ONLY OR WHILE STOCKS LAST DON'T FORGET WE ARE PROBABLY THE LARGEST SELLER OF IC's. 172 -LIVERPOOL ROAD, ENFIELD COMPONENTS. IDC CONNECTORS, Phone: (02) 745 2122 ALTRONICS KITS ETC. IN SYDNEY

banFtcorcl TWO GREAT LOCATIONS 119 YORK STREET. SYDNEY 2000 I'I (ONE: 1021 267 8777 POST AND P ICKING (Above Charlie Browns Place) Divide the value of ymrs order by 2015';) to gel post and 172 LIVERPOOL ROAD IIIUSIE HIGHWAY ENFIELD packing value and then add 52.00 - ifs that simple! PHONE: 102) 745 2122 SB Bankcard orden can only be sent to a normal address All Correspondence to: (NOT a P.O. Boat -All Bankcard orden will be sent by P.O. BOX Q302. QUEEN VICTORIA BUILDING. registered mail (add 53 to P&P charges). (ELECTRONICS) Pty. Ltd. SYDNEY 2000 ENFIELD OPEN ON SUNDAY

ELECTRONICS Australia, January, 1984 97 LL ODP1PlJTEFF BASIC More DOOMBASICS Computer Computer T \Games Games Evade man eating rabbits, play Your a war game with convoy, try & knock down a missile from the first BASIC sky only on co-ordinates etc, a, .5- etcl 84 fascinating and exciting Program games for solo and group play. Learn how to write your first Fascinating games ° BASIC program In just one in standard hour! This excellent book will Microsoft BASIC teach you the from the world 101 detailed games in Micro- of Creative basics of BASIC, soft BASIC Ideal programs the most popular Computing mag. tin--4- for your System 80, TRS 80, Cat 8-2354 computer pro- Apple gramming etc Every game is a language in complete with the actual ONLY the Oh program run, a world! sample of the game and an explanation by :1150" Cat B-2368 á 4 the author of the game. by Dr. Zaks ° r Cat B-2351 ONLY by D.H. Ant ONLY $150 51495 w_`y Y ti.n+onar / r ir.. 1. REFERENCE

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.Y: 1} d R .A a e 'd:e.:` d'pk7A,...Wrt.°.wpp :: 'ev y . . . .?¿i:F:h #A PtP . : .. e. t..gyT. . e véd1C::1P.Vi °ae . .:...... N:: .#.: #0f^. . :::. .. e"a.nA.: .: .tP m9O O, 9, n Cn RAILWAY ST I TUESLEY'S Ó-- _ JETTY c 11 GU) OLYMPIC NIND ST W.,EL STORE LOCATIONS 140, Í o HICKS NSW Cnr. Swift & Young Sts. ALBURY 21 8399 ( ,I;it Parramatta Rd & Melton St AUBURN 648 0558 t t..25 T55 Terrace Level BANKSTOWN SO 707 4888 MAJOR 613 Princes Hwy BLAKEHURST 546 7744 RESELLERS Athar con Olt: Maartens Muse Centre 55 Main St911208 Bailing N5 w. a. Cummungsb CO Oxford & Adelaide Sts BONDI JCT 387 1444 91-93 Rmr 5186 2285 Broken Hill N5W, Hobbes 6 Electronics, 37 Dude St 88 4098 Cairns Olt Electronic World Shop 27 K- Mat Weslcourt Plata Mulgraw Rd 51 8555 Gains Wt Rd 531 Pittwater BROOKVALE 93 0441 Thompson Insuumenr Serve" 79-81 McLeod St51 2404 Campbalhown NSW. Pshers'CMD Shop 147 Hume Hwy CHULLORA 642 8922 Shop 3, 214-215 Owen Su 27 1475 Cole, Harbour NSW: Colts Harbour Electronics 3 Cote, Plus Ave 52 5684 Darwin NTMinnsMinns 7426 Cavanagh St 81 3491 Den:OguTn NSW: Dent 162 Pacific Hwy GORE HILL 439 5311 Electronics 220 Cressy St 81 3672 East MannNSW. East Maitland Electronics 99 Hqh SI 33 7327 Echuca ViaWebster Electron.220 Padenham SI Geraldton Wk KB B at 315 Mann GOSFORD Electronics St 25 0235 Mann 361 Main Tom. 21 2176 Wantons Sit Puree, Electrons Shop2 Cr. Herbert h Auckland 4 Florence St HORNSBY 477 6633 Sts 724321 Cosine/NSW. Tomorrows Etectronros 6 Hr Fr68 Witham St247246 I RN SW. Lyn Willing TV 22A Evans Sr 221821 6..6ne NT: Cascade Elettronos Shop 7 Commonwealth Ban Elizabeth Dr & Bathurst St LIVERPOOL 600 9888 Acde 72 2564 Kingston Lc Kingston Electrons Channel Court 29 6082 Launceston Taw STORE Advanced Electronics 5A The Quadrant 31 7075 bonny NSW. Oecro Eiectronos 3A 6-18 Canogton 173 Maitland Rd, Tighes Hill NEWCASTLE 61 1896 HOURS 5121 4137 Mackey Olt: Stevens Electronics 42 Victoria 5151 1123 Mar ybough Olt Keller Lane Cove & Waterloo Rds NORTH RYDE 88 3855 Electron. 218 Adelaide St 21 4559 Mt Gambier Sk Humhessores Comm 5 E4abeth St 25 640a Mildura Vic McWilliams Electronics 173 Summer S1 62 6491 Port M acguarie NSW: Hall u1 All Dick Smith stores are open George & Smith Sts PARRAMATTA 689 2188 Electrons 73 Horton St 83 7440 Rockhampton Old Purely Elecnonros 15 East St 21 058 for trading during the normal Shipper ton We G V Electrons Centre 1898 Cono St 21 8866 Southport Old Amarra s Paradise The Gateway, High & Henry Sts PENRITH 32 3400 trading hours for their partic- 121 Nerang St322644 Toowoomba Olt Hunt's Electron. 18 Ned St 329677 TownewileOld boxed TV 49 Fulham Rd Vincent Village 79 1421 MapNSW. Wagga Wholesale Electrons 89 818 George St RAILWAY SG 211 3777 ular area (either 9 or - 5.30 Eorwen St Whyelle SW Mellor Enterprises Slop 2 Forsythe St 45 4164 6 Bridge St SYDNEY 27 5051 8.30 - 5). Many stores are 125 York St SYDNEY 267 9111 also open for late night trading t Please ring the store concerned SPEEDY Tamworth Acde & Kahle Ave TAMWORTH 66 1961 PHONE/BANKCARD for their particular hours. 263 Kiera St WOLLONGONG 28 3800 ORDER SERVICE ACT 96 Gladstone St FYSHWICK 80 4944 Just phone your order and Bankcard details - ins so simple, VIC 260 Sydney Rd COBURG 383 4455 Nepean Hwy & Ross Smith Ave FRANKSTON 783 9144 (02) 888 2105 205 Melbourne Rd GEELONG 78 6766 ORDER ONLY ON THIS NUMBER `'), ENQUIRIES. (02) 888 3200 399 Lansdale St MELBOURNE 67 9834 rare CUmo foto .. Bridge Rd & The Boulevarde RICHMOND 428 1614 HEAD OFFICE AND MAIL Terms available to ORDER CENTER: Springvale & Dandenong Rds SPRINGVALE 547 0522 P.O. Box 321, NORTH RYDE, NSW 2113. approved applicants TEL. QLD 293 Adelaide St BRISBANE 229 9377 through... (02) 888 3200 POST & PACKING CHARGES 166 Logan Rd BURANDA 391 6233 ORDER VALUE CHARGE ORDER VALUE CHARGE

Gympie & Hamilton Rds CHERMSIDE 359 6255 S5.00 - S9.99 S2.00 S50.00 - S99.99 S5.00 Cnr Gold Coast Hwy & Welch StSOUTHPORT 32 9211 90.00 - S24.99 9.00 S100.00 or more S6.50 Bowen & Ruthven Sts TOOWOOMBA 38 4300 S25.00 - S49.99 S4.00 Charges are for goods sent by lost no Australia only - not airmail overseas or au treghr Ingham Rd & Cowley St. West EndTOWNSVILLE 72 5722 Our customers. SA Wright & Market Sts ADELAIDE 212 1962. Ourte often the products we .dsrn.se are so popular they run out woun a kw days Or unforeseen Main Rds South & Flagstaff DARLINGTON 298 8977 awD circumstances ought hold up shipments so that affirm lased fines are not o the Ilona by the the 'oo0 PRouo lime Mon LL 27` appears And very occa Donal N an error might slip though our checks and appear ,n the advert IN ter ale we Main North Rd & Darlington St ENFIELD 260 6088 or re r human tool) Please don I Plane the store manager or stall doer cannot solve a dock strike on the other Weil WA Wharf St & Albany Hwy CANNINGTON 451 8666 the world not h. an error mats appeared In pmt if you re ,lout to dim across town N pick up en adrer file ben why not play rt sate and lane them 4 call first lust ro case William St & Robinson Ave PERTH 328 6944 / Thanks Centreway Acole, Hay St PERTH 321 4357 \ J Dick Smith It Stall/ TAS 25 Barrack St HOBART 31 0800

CONSIDER THE ADVANTAGES OF SHOPPING BY MAIL ORDER. t1 . Lightning Fast Service - our fully computerised special otters tor mail order customers only (not mail order centre will have your goods speeding even available from our stores!) back to you within 24 hours of receipt - maximum! Above all, our 15 (Normally, years of reliable mail order they're even quicker!) experience. You know when you send us an order' Special 14 day Satisfaction Guarantee - our we'll be around to serve you: some mail order normal 7 day Satisfaction Guarantee is extended to companies have given the industry a bad name. 14 days for mail order customers: If you're not but Dick Smith Electronics sets the high absolutely delighted, return your purchase within standards others try to match. You can trust 14 days (in original condition) for a full refund What Dick Smith Electronics. can you lose? New products, mail -order -only specials, etc: as a mail order customer, you'll receive up to 6 bargain

packed mailers per year AND, from time to time, «..;::caca.. DICKS.IT I 0104tA+14404f DesignTechniques for Our final article this month takes a look at scanner circuitry as a Fig. 19). This causes the counter to means of overcoming an ever -repeating, monotonous rhythm switch to output line 2 (pin 2), enabling the next diode matrix to be connected to It with a brief discussion of instrument pattern. concludes the instruments via a set of electronic simulators and describes the relevant circuitry. switches. This process is accomplished well before the downbeat pulse is generated, ie, when pin 15 of IC4, Fig. 14 As discussed in Part 1, the basic 16 and normally low. Each output line is con- returns to high (trailing edge). 32 -beat counters, when connected to nected to any required number of switch In this way we can connect up to eight the instruments via the diode matrix, elements in 4016 bilateral switches, as different patterns per rhythm selection, result in an ever -repeating, monotonous described before under rhythm selector which largely overcomes the problem of rhythm. The way to overcome this disad- switches. monotony. Obviously, one does not vantage is to introduce more than one At the start of a cycle, line 1 (pin 3) of have to design a different pattern for pattern per rhythm selection. Leaving the 4017 goes high, enabling the con- each pass but one can repeat pattern 1 the rhythm selector switch in its chosen nected electronic switches to conduct (pass 1) on pass 4 as an example. position (eg, "swing"), another circuit any pulses from the diode matrix to the It is not necessary to use all 10 output connects one diode pattern after the instruments. The 16 -beat counter (Fig. lines. The counter can be reset after any other to the instrument simulators. In 14) runs through its 16 output lines. number of lines by connecting the pin Part 1, Fig. 13, this "scanner" was il- When the downbeat arrives again (Fig. corresponding to the last pass (which lustrated as a rotating switch. In practice, 14, IC4, pin 15), the output line goes low, will still be heard) via a differentiating we use a counter, enabling electronic but does not as yet produce a positive network and an inverter (IC2b, Fig. 19) to switches. output pulse, for the instrument line, via the reset input pin 15 of IC1. The new in- Fig. 19 shows the circuit of the scanner. the differentiating network and diode.' put pulse on pin 14 (next pass) will cause It can be used in conjunction with 16 or The falling (leading) edge of this pulse the last output to go low again. The fall- 32 -beat counters. The actual scanner is a is converted into a rising edge by IC2a ing edge of this pulse is used to reset the Johnson counter, type 4017. This (Fig. 19) and is subsequently fed to the in- counter well before the first instrument counter has 10 output lines which are put of the Johnson counter (IC1, pin 14, output pulse arrives.

IC2k IC2b 4 15 FROM Fig. 14 ICI IC4 PIN 15 4017

L 2 113 .033 13 k API 1,V#4.--.- 16 BEAT COUNTER 33k 133k 33k 100k

PASS 1 r

ICI PIN PASS RHYTHM 3 SELECTOR 2 2 SWITCH

4 3 PASS 2

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6 DIODE MATRIX -~T0 SD 9

11 10

TO CY

PASS 3 33k 1

FIg. 19

100 ELECTRONICS Australia, January, 1984 m enerators part3 by NICK LABORDUS 5/3 Durham Close, North Ryde, NSW, 2113

+9V

CI C2 C3 8D BASS DRUM .047 047 0.1 M 01 LC LOW CONGA .022 .022 .047 HC HIGH CONGA .01 .01 .022 SD CL CLAVES .0047 .0047 .01

.047 ". 100k I WHITE NOISE GATE +9V ,TO HC 04 tk CV +9V D3 2.2M ,+9V

2.2M

C2 C3 IM

RINGING 0.1 OSCILLATOR I--4,TO POWER +9V AMPLIFIER 47k 05 22k BD HC LC D4 CL IM

01-09 : BC548 CI 68k

Fig. 20

Although any extension of this circuit is (a) sinusoidal oscillators there is another method. a simple l'epetition of circuitry, the (b) white noise generators This one uses oscillators tuned to dif- whole thing can become rather com- The simulators in class (a) represent ferent pitches and set to a point where plicated for an elaborate rhythm unit and percussion instruments like bass drum, they just do not oscillate. The arrival of it is not a project for an inexperienced bongo, conga, woodblock, etc. Class (b) the input pulse will disturb this situation home constructor. As an example, a represents the cymbal, brushes, etc. and will cause the oscillator to produce a rhythm unit with, say, 10 different Some instruments require the combina- damped sine wave, the damping time of rhythm selections on a 16 -beat basis, us- tion of the two, like snare drum, which can be adjusted to some extent by ing six instrument simulators for each maracas, etc. the point of oscillation setting. These cir- selection and pass, and assuming four There are many ways to realise instru- cuits are called "ringing oscillators". Fig. passes per rhythm selection, would re- ment simulating circuits. Basically, the 20 gives some examples of both quire, for the scanner alone, 10 x 6 x 4 = difference in sound is determined by two versions. 240 electronic switches or sixty 4016 ICs. aspects, ie, the pitch (frequency) of the Q1, Q4 and Q5 are buffer stages that The rhythm selector switches require sound and the envelope (shape and convert the low energy output pulses another 60 switch elements (fifteen_4016 duration). One way to get the required from the counters into pulses of suffi- ICs). The design of the relevant printed effect is to have generators that con- cient power to activate the following cir- circuit board is an adventure in itself! stantly produce the different sine wave cuits. An RC network at their output Finally, here is a brief discussion on in- frequencies, and white noise, and to shapes the pulse (eg, the envelope of the strument simulators with a suggested control the envelope by gates, activated drum sound). The higher the capacitor, design as a basis for experiment. by the input pulses. This method is the longer the decay of the sound. Instrument simulators can be grouped almost always used for the class (b) Q2 is a white noise generator that into two main classes: simulators but for the class (a) versions continued on page 135

ELECTRONICS Australia, January, 1984 101 Electronics A u strafia reviews Lea er Mo el 7401.745 and inductance from 0.01µH to 1100H. A +10% range extension can be switched in to avoid using the lowest portion of the next highest measurement iríl range. 'es Basic accuracy of resistance, inductance and capacitance workshop is complete without an No well-equipped laboratory or measurement is ±0.5% of reading ±0.1% LCR bridge. Here we take a look at two units from the Leader full scale, reducing slightly for the Electronics Corporation of Japan: the model LCR-740 and the minimum and maximum ranges. model LCR-745. Accuracy is ±1% ±0.1% full scale for the maximum resistance and inductance The Leader Electronics Corporation is a second unit, the LCR-745, features digital ranges, and ±3% ±0.1% full scale for the Japanese company which has been readout with automatic nulling and maximum capacitance range. Accuracy making test equipment for many years. range adjustment and is intended for on the minimum resistance range is ±2% Recently we obtained two Leader LCR situations where the measurement of ±0.1% full scale, on the minimum bridges for evaluation from AWA, the components is a routine occurrence. It inductance range ±3% ±0.1% full scale, Australian distributors of Leader would be particularly suitable for quality and on the minimum capacitance range equipment. The two bridges are aimed control checks on incoming stock. ±1% ±0.1% full scale. The dissipation at different sections of the market. factor (D) of capacitors and the quality The lower cost unit, the LCR-740, is The LCR-740 aimed at the general workshop situation The LCR-740 has eight ranges and will The controls of the LCR-740 bridge, as where the measurement of component measure resistance from 0.00112 to detailed in the text. The numerical values is an occasional requirement. The 11MSt, capacitance from 1 pF to 11,000µF display is in the bottom right corner.

LCR-740 LCR BRIDGE

f 0.10 1 f1 100 1000 1 K n 10K 0 1001(0 1 MO 1E11000,F 100 10,F IMF 0.10F 0.01MF

1 t--. L 10,H 100,H 1 m 1 OmH 100mH 1H 10H 1OOH tJU L SELECTOR .I

1 l l RANGE MULTIPLIER )

NORMAL «t.00 D.0 .101 1 ,191111 SOURCE nucl .1 00 -too 17_C.L. R.C.L.

SENSITIVITY ') 1°7

HI EXT. .DC (POWER OFF MAX LOCK " 1

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RNINOYtM OUA, leva trota. Nae.c» Mew 06 Puf- a L C N .UTO P.P. SER . al1TO DOWN to. . ON EaT 11 MOD WI NI 1- 0111 4111 NOtp- OK INT r.

The LCR-745 is a more advanced model featuring digital readout, auto -ranging, and auto nulling. factor (Q) of inductors may also be The latter facilitates the connection of an case, the readings differed by less than measured over the range of 0.01 to 30. external DC supply to increase the ±0.5%. Certainly, we have no reason to Accuracy of D and Q measurements is accuracy of high value resistor doubt the claimed accuracy figures for ±10% ±3 scale divisions. measurements. inductance measurements. Inductance and capacitance To the right of the input terminals is a The only complaint we have with the measurements are made at 1kHz, which combined power on/off switch and null LCR-740 bridge concerns the two end is generated by an internal oscillator. A sensitivity control, together with a 10 resistance ranges: the 0.112 and 1M12 panel switch allows resistance turn vernier drive and associated ranges. When measuring resistance on measurements to be made at either DC numerical display. When the bridge is either of these ranges, the meter shows or 1kHz. nulled, the component value is found by almost no deflection from the null A jackplug socket also allows an multiplying the vernier reading by the position. Consequently, it is almost external signal of between 50Hz and selected range multiplier. impossible to find the null with any 40kHz to be fed into the bridge and A small toggle switch changes the degree of accuracy. The manual measurements made at this frequency. vernier range from the normal zero to 10 describes how an external DC supply This facility is useful for iron cored range to one to 11 range. This helps may be used to overcome this problem inductors and electrolytic capacitors reduce the ±0.1% full scale error on the 1M12 range, but not for the 0.112 whose values are frequency dependent, component by allowing measurements range. and may need to be tested at the which would normally be made on the The only way to obtain a usable null on intended operating frequency. lowest portion of a range to be made on the 0.19 range is to use an AC source. This is suitable for measuring resistor The LCR-740 comes in a small, sloping the highest portion of the next lowest values, be measure front metal case with approximate range. but cannot used to the resistance of coils as the AC dimensions of 240 x 170 x 85mm (W x D Also supplied with the LCR-740 is a impedance will alter the reading. x H). Weight is 2kg. A single 9V battery small earphone which plugs into the In summary, the LCR-740 LCR Bridge is supplies power or an external 9VDC lower front panel and allows the bridge án easy-to -use unit that generally met its power supply may be connected via a to be nulled by ear. As the bridge is specifications. It is well made and should panel socket. tuned closer to the null, the level of the find a ready place in most electronics a tone decreases. The centre of the null is The .controls are fairly standard for workshops. hand nulled bridge. In the top left hand found by adjusting for the lowest corner is a centre zero "null" meter volume. The LCR-745 which indicates the degree of balance of While this is a good idea in theory, in The larger bridge, the LCR-745 is much the bridge. Below this is a D.Q dial practice the differences in tone become more complicated internally than the control which compensates the bridge too slight to be heard as the bridge LCR-740 and consequently carries a for series resistance in components moves toward null. Consequently, the higher price. Dimensions are 400mm x under test. It indicates the Q or D of centre of the null cannot be located with 300mm x 100mm (W x D x H) and the inductors and capacitors directly. any degree of accuracy. is We found the LCR-740 a very simple weight is 5.5kg. Power supply 240VAC On the top right of the panel is a three only. by eight switching matrix. A 3 -position and easy bridge to use with no evidence Unlike the LCR-740, the model 745 slide switch on left of the matrix of the false nulling which makes some the requires little manual adjustment. It selects resistance, or AC bridges so hard to use. We checked capacitance boasts an internal microprocessor and inductance, while a the bridge against several 0.5% tolerance row of eight features autoranging, auto -nulling, digital pushbuttons under the matrix the capacitors and the readings were within selects readouts, and an automatic offset desired range. A 2 -position source the 0.5% limits. We also compared function. It measures resistance from switch in the centre of the panel selects bridge resistance measurements with .00112 to 19.99M12, capacitance from AC or DC for resistance measurements by our digital multimeter measurements. 0.1pF to 1,999µF, and inductance from Below (0.2% accuracy) and in each case there the source switch are three 0.1µf to 199.9H. input terminals to the was extremely good agreement. connect The front panel is an off-white colour component to be measured. The We have no standard inductors in our with a large dark section designed to is hand laboratory but we did compare component connected to the left highlight two readouts. These are two and centre terminals, while the right measurements of several off-the -shelf 108 hand terminal is permanently earthed. inductors on the two bridges. In each Continued on page ELECTRONICS Australia, January, 1984 103 JAYCAR/ ELECTRONIC o AGENCIES

Jaycar Electronics is proud 'to Jilannounce a range of very low cost "Turtle" like robot kits. Don't let the low prices fool you - they are not toys. The units feature solderless connections with explicit illustrations to ease assembly. Only simple tools (i.e.. screwdriver, pliers etc.) are needed to assemble. PIPER MOUSE

This "microbot" is powered by 2 DC motors that drive wheels. When it special ultrasonic whistle is blown, the unit goes left, right, straight ahead according to your command. Complete, including perspex dome cover! Be a Pled Piper! Cat. KJ-6680 ONLY 539.95 AVOIDER (not illustrated) Similar to the Piper Mouse, but this unit travels on its own. It avoids objects because it has an infra -red beam system. Very clever! Cat. KJ-6682 544.95

LINE TRACER (not illustrated) This robot will automatically follow a black line drawn onto a sheet of paper. It uses an infra -red feed back system. es» -r Cat. KJ-6684 539.95 1 MEMOCON CRAWLER (not illustrated) This robot is controlled by a keyboard which is supplied. The operation of the unit is programmed by the keyboard and stored in RAM. All movements can be controlled as well by lights (beams) and sound (buzzer). A very sophisticated unit. Cat. KJ-6686 579.95

Note: The "Microbots" work well on their own but can also he used as a platform for robotic develop- ) ment .If you are a robot experimenter you will find them useful as they help resolve the mechanical parts problem.

30W + 30W ca. c.al STEREO PREAMPLIFIER "":4":"4- Plseoad STEREO AMPLIFIER ] I:f - Fully built and tested we .r '7aw -9' - Separate bass, treble, balance and volume controls - Less than 0.1% distortion - Mic, phono and aux. inputs (line) 1 - Power supply components on board r Back at last! No hassle amplifiers. Just connect a transformer, speakers a signal and you're away! =`J r"11".. J sr , + STAGGERING VALUE .1°t ,i.i v- 4 _ . - - only . ,e.: $3495 áEr-771 !.t . . 1 i...ae+-. 41110 '-

Ref: EA NEW ETI JOYSTICK CONTROLLER June Ref: ETI Dec 133 minitune 1983 \ Following the spectacular success of the DP2010 Digital Multimeter True proportional control with this kit kit. we now have an ENGINE ANALYSER KIT! But the spectacular i thing is the price) It is ACTUALLY CHEAPER than the DPM-05 Includes recommended joystick unit. Display and Case) The Minitune will measure voltage, resistance (down to a very low range), RPM and Dwell Angie. A Cat. K.L7012 542.95 %e' TEST LEADS TO SUIT ONLY 52.95 ONLY $24.95

aeec,hea,.on 7K Function F 5 D R..olueon 4ccu.a'V / Vouag. In c i 20V IOnw 05' 1, i 200v [00my 05 1 nna 'IF/ Re.: . Stance 2000 t00..0 05 1(i.,sa 20551 100 0 5 1 d9.i RPM 20000.0m 10.0 0, 1 3 n.g.i. Dwell 90 01 2 .3u.v A leca . n^rX) 32 DIGITAL M/N/TE. METER .(not illustrated) EFFECTS ! PANEL BBD BOX Low cost unit. Completely self-contained. No longer an expensive proposition! Fantastic lowcost Instrument using the versatile MN3001 Bucket - This easyto-build kit (takes about I hour) is self-contained, contract and even Brigade Delay Line to achieve brilliant sonic effects. Now you can comes with a front panel filter/bezel. It can be battery 6V or EL powered. emulate the commercial rock groups with Phasing, Flanging' Reverb 2(0nrV. Full scale (n/- 199.9mV) and Echo. The Jaycar kit includes all components INCLUDING IC - Input impedance 10 to the twelvth ohms sockets and the 1.104 box. (Not cut down but this Is easily done). - - Required DC 5-6V IF' 150mA Jaycar has a specially built cabinet for this kit with all holes pre - punched etc., at only 510 extra but only if you buy the original - Guaranteed to reset ro zero at zero input voltage kit from us. Available as a separate item for 529.50. WHEN THE - Automatic reverse polarity indication KIT IS PURCHASED WITH THE DE -LUXE CASE THE TÚ04 - Assembly instructions Include notes on using your DPSI for: Antp.meter. CASE WILL NOT BE SUPPLIED. AC-Vol titer, Anmeter. Thermometer. Frequency Counter. Capacitance deter (circuits supplied) Special cabinet to suit Cat. HB-6445 $10 STAGGERING VALUE 529.95 Complete Klt Cat KE-1522 ONLY $79 Cat. KJ-6670

104 ELECTRONICS Australia, January, 1984 Jaycar will not be knowingly undersold FOR GOODS OF THE SAME With this kit and the interface facts QUALITY, If you find that a competitor is cheaper, get all the electronics you can forget about and tell usl If you are right we will match OR LOWER his price! UV HAD contact breaker point problems! Please understand that we cannot match the price of goods that are NOT the same quality as ours. Cat. KJ-6655 $29.95 d - nohow. co r- PLEASE NOTE New PCB for TAI Kit this system must be used in 500MHz Conjunction with an electronic Ref: EA Dec'81 Feb182 DFM includes Hall Effect ignition. The Hall Effect device - has by far the bast kit version of this interface. Cat. HP -8786 will not switch enough current Jaycar $2929 to replace the contact breaker points project in Australia. We now supply 2 x ONLY $3.95 on their owml GOLD plated BNC input connectors at no rotor ab system. A professionally-engineered electronic ('breakerless"i contact breaker extra cost) KA- 1390 (50MHz) $129 assembly designed to adapt to an extensive number Yes, only Jaycar has a complete Hall-effect triggerhead KA-1392 (500MHz option) S20 tn99tr head of cars. Each kit contains the following: wacen - HALL EFFECT TRIGGER HEAD - MAGNETIC ROTORS FOR BOTH 4 & 6 CYLINDER CARS OVER 6 CAM LOBE ADAPTORS ar+es FOR YOUR PARTICULAR DISTRIBUTOR yw sAWte rlmeie adapter pare OVER A DOZEN DIFFERENT ADAPTOR PLATES s , OTHER HARDWARE (i.e. SCREWS etc.) THE YOU CAN REMOVE THIS SYSTEM AND REEQUIP YOUR CAR WITH ORIGINAL - BREAKER POINTS WHEN YOU SELL THE CAR, sync ere roto. f AS EASY TO INSTALL AS A SET OF POINTS( - INSTRUCTIONS ISIMPLETO.FOLLOW) INCLUDED( cars. In fact it will also fit many Australian cars can adapter This set is designed to fit most European and Japanese r If you wish to check first, please fitted with Lucas, Bosch, Motorcrah, AC Delco or Autolite electrics. distrilwtor cam send SAE for car/distributor list. distributors available. Basically Because we have no way of knowing you get the fitting set for ALL of the next ENHANCER for your car?) VIDEO parts that you don't need [ousel (Perhaps you end up with a jar full of Ref: EA Oct 1983 we supply such a comprehensive kit for this price. To produce a Quite frankly, we are amazed that can Get Improved performance from your VCR. is amazing! kit that will adapt to the dozens of different distributors around S35.00 and that of your system Cat KE.7018 Remember, once you have installed a breakerless system it will never wear oat part will remain in tune FOR EVER. check with us early! We expect tiles kit to sell well. To ensure that you receive one, Cat. KJ6655 E:MIANCEN . y0 Breath Tester ;fafjll $35 ` ,,N In all states and territories in Australia it is an offence to drive &vehicle with an alcohol/ Either blood concentration above a certain limit. In most states It's 0.05 others 008. way It's only a relatively small number of alcoholic drinks. :e wrongly) believe that a e auaeeaa Because it's only a small number of drinks, many people (quite Video Amplífieri * getonks the statutory limit. 'a1 they remain below a t help here. A with the same circuit diagram was The KA1522 Breath Tester can unit a i Ref EA Aug 1983 Australia", It CANNOT give you an actual blood/alcohol a a featured in May "Electronics Buffer VIDEO AtsO'LIFlER reading between content reading, however it can go close. And it can give you a relative at sere attwer to a beams power, r e TV cat m at boa of necessary It at Trn tierce can beetle* t0 ,m.ae s le so inebriated friends! Great parties!!! r arise of year TV, It w ucaay ales yd tO connect crpte bow the video whole now for only $29.95. You never know, it may save your licence or the uptai Iron - Grab the kit %droop n intow a cdewr bmdo T1,1 mean mat redo your to RP and go your life) r, VCR, TV game etc, does of need to be converted r WWI cdeO acomboretln the Tv If strip. you will be rowed by me Clearer, thyper that hit less ineeeeeeemet Notes on hew to ht 10 renew. TV can are ,ne4dee 514 95 Jiffy Box to suit Cat Ka 1527 H B-6003 $2.20 ONLY $2995 IAN In..,. VK POWERMATE - NEW MODEL Ref: EA Dec. '82 $89.95 comp Get up to 13.8V @ 10 amps to run those mobile rigs at home) The Jaycar kit is complete.

INFRA RED -VK Pors'ermak' DIMMER KIT 95 8 ar 41. y Ref: EA January 1984 Ref: EA May/June 1983 Now you can dim or him off the fights from the comfort 50V/5A laboratory Cat. KE1520 of your armchair! Short form kit contains all parts for I.R. kit, Note this power supply must he used voth a Jaycar KA-1509 Touch Sensitive $149.00 Dimmer (519.951 Cat KA-1530 525.95 VIDEO SENSATION

as specified by ETI AT LAST Two models (i) Short form which contains ALL PC8 components holes, solder mask and comp ILIEWAREIII. The genuine ETI PCB with plated-thru ' - 4vor a full set of quality A Video Enhancer/ onent overlay Is supplied. We alos supply at NO EXTRA CHARGE `,o ETI making comparisons 644 A with plated.thru PCB's - Remember this when IC sockets. must Distribution Amplifier` (ill Full kit Includes: all of the above plus 12V plug pack, case, front panel, switch and Makes acomplete stand alone modem. DIRECT LED bezel and Cannon DE425 RS -232 connector. modes Selectable Baud rate designed Cayable of a range of Answer/Orlyinate operating reliable and faster than CONNECT Software controlled. Uses new patented technique More only S22.00 EXCLUSIVELY MODEM most acousdc modems, Arlec transformer as used N this project "NEW UPGRADED MODEL Y for AUSTRALIA Ref: ETI FEATURING THE LATEST NOT A KIT IMPROVEMENTS AND October 1982 MODIFICATIONS" BUILT TESTED C Jaycar has had designed a high quality, high performance Video SHORTFORM KIT COMPLETE KIT Enhancer which is specifically for the Australian 625 line 50 frame AND GUARANTEED Cat KE-4600 Cat KE-4601 PALO system. As far as we know It is the ONLY Australian designed, Australian ONLY $169 ONLY $199 M211,' built unit available!! 95 But, wets what? The Jaycar AV8501 Enhancer is CHEAPER than LESS SPECIAL DISCOUNT its Inferior Imported Asian counteeparesll This unit Is professionally designed and University tested) It works JANUARY ONLY 10% and it works well.

Incorporating NUMBER 1 FOR KITS AGENCIES POST AND PACKING CHARGES ELECTRONIC 55 - $9.99 (51.50) Sto - $24.99 (03.20) Jaycar S25 - 549.99 (54.50) S50 - $99.99 ($6.50) SYDNEY SHOWROOMS 5100 - $198 188.001 Over 5199 IS 10) "Free INSURANCE for Road 8. Registered Post over 5200" 2671614 117 YORK STREET - PHONE: (021 264 6688 and (021 All heavy or bulky items lover 20kg.) sent Cornet Road Freight S12.00 anywhere TELEX:72293 on Australia. CARLINGFORD SHOP HOURS CARLINGFORD, CONCORD & HURSTVILLE PENNANT HILLS ROAD PHONE: 102) 872 4444 Cnr. CARLINGFORD & - Mon - Fri gam - 5.30pm: Sat - gore - 12pm: Thurs night 8.30pm CONCORD SHOP HOURS SYDNEY BANKCARD PHONE: 3077 Mon - Fri 8.30am - 5.30pm. Sat - 8.30.1m - 12pm: Then night 8.30pm 115- 117 PARRAMATTA ROAD - 1021 745 Via Your Phone, MAIL ORDERS AND CORRESPONDENCE:, P.O, Box 185, Concord, 2137 HURSTVILLE 121 FOREST ROAD - PHONE: 1021570 7000

ELECTRONICS Australia, January, 1984 105 N w Products... Product reviews_ releases & services Data Conversion Components

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Data conversion They are offered with standard rails or to HighHigh spec power supplies customer specification. component's catalogue All are short circuit protected, have Scientific Electronics advise that, Elmeasco Instruments has announced in 80W continuous and 150W ratings, are addition to their the release of a new, 376 page data SM80AE1 power supply more than 60% efficient at full load, and mentioned in conversion component product October 1983, they have have better than 3.5kV isolation. All two more versions of the catalogue produced by Datel. It contains SM80AE series. measure 108 x 240 x 45mm and All have carry a full enginéering data on the following been designed and five year warranty, with complete manufactured in Australia monolithic, hybrid and modular to meet technical back-up from the makers. Telecom specification 1302. products: A/D and D/A converters, data Additional information is available acquisition subsystems, sample -hold The additional models are SM80AE2 from Scientific Electronics, 6 Holloway amplifiers, operational amplifiers, and SM80AE3. Model 2 is a four rail Drive, Bayswater, Victoria. Phone instrumentation amplifiers, version and model 3 is a six rail version. (03) 762 5777. isolation amplifiers, analog multiplexers, and special function circuits. Products are organised into quick. selection tables that are arranged by function and performance to ease product selection for any given application. Complete data sheets are included for key products along with R`.ya tutorial information and an ordering guide. A copy may be obtained by request on company letterhead to: Elmeasco Instruments Pty Ltd, PO Box 30, Concord, NSW 2137.

or'/. duty cycles to drive up to 14 digits of a 7 -segment display or eight digits of a 14 -segment display. In the 7 -segment display mode, package. LCD numeric characters and six mathematical Sharp screen High contrast and a wide viewing angle symbols can be shown, while the are achieved by use of a newly 14 -segment mode allows 36 with 80 x 16 lines developed wide area cell design which alphanumerics and 13 other symbols. can be driven at a relatively high duty Input to the display controller is in 8 -bit The Sharp Corporation has' developed cycle (1/64 duty). With the increasing serial form and the device is packaged in a liquid crystal display screen capable of importance of portable computers using a 60 -pin "flat pack". displaying lines 16 of 80 characters each LCD screens the new Sharp display is For further information on the 80 x 16 or graphics with a resolution of 480 x certain to find many applications. LCD panel or the LH5008 display driver 128 pixels..Designated the LM -480001G, Also from Sharp is a new contact Daneva Australia Pty Ltd, PO Box the unit a provides viewing area of programmable CMOS LCD driver, the 114, Sandringham, Vic, 3191. Phone (03) 237mm in x 70.5mm, a slim, lightweight LH5008, which can be operated in Y2, 'Y 598 5622.

106 ELECTRONICS Australia, January, 1984 for use in existing or new mobile users sharing the same channel. Mobile radio radio systems. Designed for quick and simple ident system The ANI system provides a "quiet installation, the system comprises of a base" facility whereby the base small encoder which is installed in the Signalling Technology Pty Ltd has station responds only to suitably mobile, and a wall -mounted decoder released a new low cost Automatic encoded signals from its own plus an attractive desk -mounted Number Identification (ANI) System mobiles, ignoring signals from other display unit at base. To initiate calls from a mobile, the caller simply activates the microphone "press -to -talk" button which automatically transmits the mobile's identity to the display unit at trin base. The ANI simultaneously opens 1 1_I ÍI It the channel, enabling immediate response from base in the normal manner. For base to initiate a call, the operator simply activates the display unit's "quiet base" switch. The system carries a 12 month warranty with full service backing, and it complies with the Department of Communications regulation for mandatory fitment of "Quiet base" facility to all new radio installations. Further information from Signalling Technology Pty Ltd, Factory 8, 2 Apsley Place, Seaford, Vic. 3198.

35MHz (-3dB) bandwidth, 10ns rise High performance CRO 10 division graticule, each division time, 2mV to 20V/division sensitivity, measuring 9.5mm. The instrument itself from BWD Instruments and triggering to 50MHz plus TV line and measures 250 x 350 x 178mm frame lock with automatic changeover. (W x D x H) and weighs 7.8kg. BWD Instruments has released its new The vertical amplifiers can be displayed For further information contact BWD generation oscilloscope, Model 824. This independently, alternatively, chopped, Instruments Pty Ltd, PO Box 325 instrument is designed, manufactured, or added. The amplifiers and timebase Springvale, Victoria, 3171; or PO Box 62 and serviced in Australia, and the makers calibrations are rated to hold within 3% Rydalmere, NSW, 2166. claim that is is more than competitive over the temperature range +5°C to with imported units. +40°C, and up to 95% humidity. It also The 824 is a dual -trace CRO using a ignores power line changes from 195V, Keller International CRT with. an internal graticule. Brief to 264V. specifications are as follows: DC to The CRT display features an 8 division x spot welding gun

The Kelarc spot welding gun is a new device from Keller International Ark Pty Ltd which enables welds to be made from one side of any clean - - surfaced 18 to 26 gauge steel. Claimed to be ideal for automotive _,yM 3 NM. t-O-'pPF use and repairs, the welding gun works from a 50A transformer and is trigger operated. In use the gun is 11.1.1.111~ .,... ..11111~ ..._ held firmly against the metal surface and the trigger pulled back to withdraw the carbon welding electrode. Relaxing the pressure on the trigger then forms a small molten puddle next to the spring -loaded VM. 1 1.1, (., welding electrode. On pulling back the r-. trigger again an arc is struck, 5 allowing the weld to be completed in four to five seconds. The welding gun is manufactured in England and is , © _ imported exclusively ai: by the Sovereign Welding Centre, Nobby's Creek Rd, Murwillumbah, NSW, Phone '1 2484. (066) 79 1455.

ELECTRONICS Australia, January, 1984 107

New Products... RX-2300-KIT MICROWAVE DOWECOHVERTER Listen in to the ASSEMBLY oAta ttx. ^ `11r {/1º MANUAL Nr3k W e ti Space Shuttle with :au> GFS down converter TerellOKAOWRVECORP., GFS Electronic Imports now has availabe a 2.3GHz down converter kit, $8818 - 97th Avenue Hortb Corcoran, MN 98974 the Model RX-2300. The kit is designed . ,:_ Telephone 811.498-8014 DO T¡ to go together easily and can be tuned to any 50MHz band between 1.69 and 2.7GHz. Transmissions of interest in this band include weather satellites, NASA's . I. I Prices: Manuel only S -band Space Shuttle video and audio ° ° Hardware only link, and a NASA beacon on the moon. Electronic' only The IF of the down converter can be Complete kit ,914. selected by the user between 54 and 220MHz. All components are supplied with the kit, including a comprehensive are portable digital power meters demand over a preset time period from instruction manual, diecast metal box designed to monitor the energy 1 minute to 99 hours. and the required BNC connectors. Cost consumption of mains powered The MW-200SD model provides just is $89 plus $5 post and packing. appliánces. The Model MW -200 the accumulated kilowatt/hour display.

GFS have also announced " price provides an instantaneous kilowatt For further information on the reductions of up to 30% on their range of readout with provision for output to a microwave down converter or Soar Soar energy monitors. Soar units single channel chart recorder such as the energy monitors, plus a wide range of available from GFS are the MW -200 and MR -200. With this combination the user commercial, marine and amateur radio MW-200SD and the companion MR -200 can monitor peak demand power or use gear, contact GFS Electronic Imports, PO chart recorder. the accumulated kilowatt/hour feature, Box 97, Mitcham, Vic, 3132. Phone Both the MW -200 and the MW -2005D which automatically integrates power (03) 873 3939. semAS w»ZIMII~ILw.waaeaw.meaawiw-wwIIMP The last two LCR 13103 buttons control the Leader bridge ... caot'd from application of bias voltages to green 3% -digit LED displays. One is used components are now connected, the capacitors. The first button switches for the component value, the other to display will indicate by how much they between bias or no bias while the indicate D and Q values associated with deviate from the standard. This function second button switches between an capacitance and inductance has obvious uses in quality control. internal 1.5V bias source or an external measurements. Back -lit annunciators on Five input terminals are provided, four bias source. External bias voltages of up either side of the 3% -digit displays of which are for connections to the to 30V may be applied. indicate the measurement range and the unknown component. The fifth terminal It is not practical to quote hard and fast status of the bridge. is connected to chassis and, by accuracy figures for the LCR-745 since The D and Q values are measured connecting it to an external component these figures vary according to the using either a series or parallel shield, will prevent measurement error parameter being measured, the equivalent circuit. The choice is due to external induction or stray measurement frequency, the range indicated by a small green LED adjacent capacitance. setting and the equivalent circuit used to to one of four small circuit schematics A row of pushbuttons controls most of model the component. As a guide, in the drawn on the front panel. A pushbutton the functions. Buttons are grouped middle ranges accuracy is better than switch allows the user to select either according to function by grey coloured ±0.5% for inductance, resistance, and 120Hz or 1kHz as the measurement surround markings. The first three capacitance measurements. This degree frequency. buttons are labelled "L", "C" and "R". The of accuracy should be good enough for An "offset" pushbutton is provided to second three buttons are grouped under all but the most stringent laboratory. cancel residual or unwanted readings. the heading "circuit mode" and select In practice, we found the LCR-745 This control may be used in two ways. the equivalent circuit (series or parallel) extremely easy to use. When switched First, it can be used to remove any used to determine the component value, to automatic mode, component values residual value produced by the bridge as well as the D and Q values. These are are displayed in less time than it takes to wiring and terminals which would labelled "auto", "para" and "ser". tighten up the terminals. All readings otherwise add to the value of the A further three buttons, under the obtained were within the component component under test. Second, it allows. heading "range", control the tolerances and, as before, we have no quick comparisons to be made between measurement range. In the "auto" mode reason to doubt the claimed accuracy. component values. the LCR-745 automatically selects the Prices are $318.24 for the LCR-740 and For example, if a standard value correct measurement range. In the $1551.42 for the LCR-745, including sales component is connected to the bridge "hold" mode the correct measurement tax. For further information contact and the offset button pushed, the bridge range must be manually set by single Amalgamated Wireless (Australasia) will be offset by the standard value, even stepping through the measurement Limited, 422 Lane Cove Rd, North Ryde after the standard is removed. If other ranges using the "up" or "down" buttons. 2113, NSW. (JS)

108 ELECTRONICS Australia, January, 1984 INTERESTED IN ELECTRONICS? Domestic solar THEN WHY NOTTURN YOUR HOBBY power systems INTO A CAREER? Amtex Electronics, Australian specialists in solar electricity, has released a new solar module featuring square solar cells. The square cells are the first of a new generation of solar ------"---"- modules from Amtex featuring AL. ,.....° polycrystalline silicon material. Amtex w claims the new solar modules are more efficient and economical for domestic use in remote areas. mot- , Amtex has a range of five complete =-- systems based on these new solar * modules. Each system comes complete with batteries, cables etc down to the last bolt and nut, and is designed for ..,. installation by a handyman. 4c.4 o Included in the range are two DC models for small power requirements, .. and three AC models offering capacities of one, two and four kilowatt hours of energy per day. With the new Amtex modules, a home r..,: can be supplied with 240V AC solar ( .. power from $7300 upwards. The smaller DC model, the Solar Lighting Kit, is $695. Further information from Amtex Alan Mulraney, Stott's Graduate, in his workshop. Electronics, 11 Spring St, Chatswood, In this fast -changing electronic world people with interest and NSW 2067. Phone (02) 411 1323. training are going to be in demand. Turn your interest into a lucrative career in any one of the following fields: Computers Industrial Controls Medicine Radio Communications Domestic Radio & Television Electronics plays an important role in these and many otherfields. With a Stott's Home Study Course, training is easy, and will prepare you for a career in the manufacture, installation, commissioning, sales or servicing of electronic equipment. You'll have experienced, professional instructors who will guide you through an integrated theory/practical program. They'll give you individual attention and advice, and prompt replies to all test assignments and queries. And best of all, you'll study at your own pace, in your own home. Send the coupon today. It may be the smartest move of your life.

Melbourne, 159 Flinders Lane. 3000. Tél 636212 r Sydney, 383 George Street. 2000 Tel 292445 Brisbane, Suite 3.65 Mary Street. 4000 Tel 221 3972 a B.: Adelaide, 85 Pine 5000 Tel re le) Street, 223 3700 CORRESPONDENCE COLLEGE W. Perth, 25 Richardson Street. 6005 Tel 322 5481 Hobart, 150 Collins Street. 7000 Tel 34 2399 The name to trust in correspondence education. New Zealand, Box No 30990. Lower Hun Tel 676 592 Please send me free, and without obligation, The Stott's range of courses lull details of the following courses: in Electronics is: (PLEASE PRINT) Intro to Electronics ,1 Digital Electronics for It ;t Technicians/Servicemen MR. MRS. MISS AGE _ Microprocessors AM Radio Receivers ADDRESS Radio TV Servicing POSTCODE Colour Television Stott s undertake that no sales counsellor will visit you ALA/ST466/EA78

ELECTRONICS Australia, January, 1984 109 u

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CPU Z80A Video display 24 lines x 40 characters Clock speed 4 Mhz 7 x 12 dot matrix (TV or monitor) Total RAM 70K 24 lines x 80 characters Screen Mem 2K 7 x 12 dot matrix Colour Mem 2K (monitor preferred) PCG Mem 2K Cursor Flashing block User RAM Keyboard Full size 60 key under Disk OWERTY layout drives 64K 4 programmable function Actual user keys -8 functions RAM under Cassette Built in BASIC 48K interface software controlled at 1200 Language Extended Microsoft BASIC and 300 baud - Kansas City Similar to Tandy level II (counter timer circuit) Disc Basic but also includes I/O Ports Serial. full RS 232C colour commands Parallel.'8 bit centronics Cplour 32 foreground colours compatible 8 background colours Expansion 2 expansion ports on using video or AF board each providing all 27 foreground colours major control and data lines using AGO with monitor Audio Single channel 3 octaves Graphics mode 128 programmable programmable under BASIC characters 128 graphic characters Power supply On board 96 ASCII characters Options Disc controller board (includes lowercase) Direct connect Modem Video AF, video and RGB OUTPUT Resolution low res 320 x 288 pixels Hi res 640 x 288 pixels

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PHONE ORDERS AND ENQUIRIES (03) 267 2147 °BGR MAIL ORDERS G.P.O. BOX 5302BB, MELBOURNE, 3001 SHOWROOM SHOP 13, GROUND FLOOR, FAWKNER TOWERS, 431 ST. KILDA COMPUTERS P/L ROAD, MELBOURNE, 3004 SAVE TIME - ORDER DIRECT physical properties of materials, passive components, active semiconductors, bipolar transistors, diodes, field effect devices, fabrication of semiconductors, analog and digital circuitry, digital computers, microprocessors, very large scale integration and optoelectronic components. The many line illustrations are simple including primary and secondary cells, and to the point, but the book suffers and generators. The section on from some sloppy proof reading, such as electricity secondary cells appears to be the only leaving in an incorrect 2 lines, followed one -seven sour note in the book. The author seems by the correct copy, to quote an NvIMe ..aona saltlon to get hopelessly tangled up in the example. This book would be OK for a .APPT Mi, «Al CY).TQ1..at C.*.CT matter of ampere -hour capacity, certificate level student, although for 44.:. claiming - and demonstrating detailed application information one f3.0.M19f.ftna'.v>yty ..; :' graphically - that the ampere -hour would need some of the data books figure remains the same, regardless of published by device manufacturers. the rate of discharge. Also, although a (NJM). discharge rate (20 hours) is quoted, the reason for it appears to be, completely lost. The last chapter (7) deals with electric motors: DC, AC, synchronous, multi- 1172.121 phase, stepper types etc. The general style of the book is to make each chapter self-contained, Electrical principles starting at a quite elementary. level and proceeding, in very small steps and ELECTRICITY ONE -SEVEN edited by Harry aided by numerous diagrams, to a very Mileaf. Published by Hayden Book advanced level at the end of the chapter. Company Inc, New Jersey, USA, 1978. By and large it does this . very well, Hard covers, 150 x 235mm, 1000 although one gets the impression that ít pages (approx), copiously illustrated tries TOO hard to get across some with diagrams, ISBN 0-8104-5952-3. simple concepts, with the result that Recommended retail price $49.50. they don't seem simple any more. But, it emerges as a As the title suggests, this book is critisisms aside, still valuable reference book, perhaps a concerned with electricity, as distinct a from electronics, and so would seem to little expensive for the individual, but useful addition to any technical library. be directed at a more restricted Schematic diagrams audience than most generally available Our copy from Holt-Saunders Pty Ltd, 154, NSW textbooks. In fact, this approach is not as Publishers, PO Box Artarmon, HOW TO READ AND INTERPRET restrictive as might be imagined. On the 2064. (PGW). SCHEMATIC DIAGRAMS by J. Richard one hand, an understanding of Johnson. Published by Hayden Book electronics pre -supposes a thorough Co Inc, New Jersey, USA; 1982. Soft grounding in electricity, out of which it Electronic components covers, 150 x 229mm, 196 pages, evolved. copiously illustrated with diagrams. AND ISBN 0-8104-0868-6. Recommended On the other hand, the coverage of ELECTRONIC COMPONENTS SYSTEMS by W. H. Dennis. Published retail price $15.95. this book is greater than the title might Pty Ltd, 271 Lane This is a rather unusual book in that the suggest. It stops short of valves, by Butterworths Hard covers title does not, perhaps, quite do it transistors,and ICs, but only just. As well Cove Rd, North Ryde. 258 pages, 222 x 142mm, numerous justice. It is not simply an explanation of as the obvious DC and AC circuits and 4 the role of schematic diagrams, or how components it progresses logically into line drawings. ISBN 0 408 01111 the effects of inductance and $33.60. they are drawn, or comparison of reference book schematic symbols with their physical capacitance, resonance, low and high This would be a handy on a course of counterparts. It does, in fact, do all these pass filters, pi and 'T" networks, for anyone embarking or things, but it goes a lot deeper than that. optimum tuned circuit coupling etc. theoretical study into electronic electrical engineering as it gives a useful It is almost as though the author set out In fact, the first four chapters are background to most of the components to produce such a simple explanation of devoted to these subjects, some of one is likely to encounter and gives the schematic but, somewhere along the which are dealt with at considerable reasons for choosing different types of line, things got out of hand, and the tail depth. Chapter 5 covers meters of construction. This is important when one started to wag the dog. If so, then it was various kinds, including the traditional is faced with a wealth of different types a happy accident, because the end result moving coil meter and the application of of capacitors, resistors etc and without is a most useful book that should fill a shunts, multipliers, rectifiers etc to the hindsight of experience, it is easy to gap on many a library shelf. produce the typical multimeter. Moving choose a component on electrical values What, ín fact, emerges ís a detailed iron, hot wire, and thermocouple alone, with sometimes disastrous results. description of 'both the actual systems are also explained in detail. There are thirteen chapters ranging components represented by schematic Chapter 6 covers power sources, from basic aspects of electronic and symbols - resistors, capacitors, 112 ELECTRONICS Australia, January, 1984 switches, solid state devices etc - and New Babani titles THE PRE -COMPUTER BOOK by F. A. the circuits in which they are used. Wilson ISBN 0 85934 090 2 NEW BABANI TITLES: Various The descriptions include detailed authors, Intended for readers who want a quick published 1983 drawings of the components and, in the by Bernard Babani but thorough introduction to computers, Ltd, London, case of solid state devices, cross England. Soft covers, 110 this book covers hardware components, x 176mm, sectional drawings of the more complex around 100 pages each, binary arithmetic, machine language and illustrated with versions, such as JFETS, MOSFETS, etc diagrams. introductory Basic and screen graphics. together with thumbnail sketches of With eight chapters and five appendices THE ART their main characteristics. The action of OF PROGRAMMING THE ZX there is a wealth of information for the SPECTRUM by M. lames ISBN an SCR, for example, is explained using a 0 85934 beginner. Price is $5.85. two transistor, discrete circuit 094 5 arrangement to lead logically to the four Introducing the Sinclair spectrum HOW TO DESIGN AND MAKE YOUR colour this layer práctical device. computer, book opens with OWN PCBS by R. A. Penfold ISBN 0 "Getting to These are followed by a number of know your Spectrum" and 85934 096 1. what might includes chapters on low and high be termed "basic circuits", In three chapters this covers design and designed to resolution graphics, the use of the RND show how the components manufacturing of printed circuit boards are function, sound effects, screen used. These include single and multi- .using etch -resist inks and photographic stage animation and Basic programming. amplifiers, including push-pull techniques. Examples are given for Plenty of examples are provided for each each configurations, oscillators - Hartly, step of the various processes described Colpitts, Armstrong, topic. resistance coupled, with the emphasis on the practical blocking - and examples of digital logic aspects of PCB design and construction. circuits. And PRACTICAL ELECTRONIC BUILDING so far, we are only into For $5.85 the book seems like good BLOCKS BOOKS 1 and 2 , by R. A. chapter two. value for anyone interested in Penfold. ISBN 0 the There are many more examples, too 85934 092 9 and 0 subject. numerous to mention. Suffice it to say 85934 093 7. that if you want to brush up on the These two books are a useful EASY ADDON PROJECTS FOR circuit of a Darlington pair, an RS flip- collection of circuits intended to fulfill SPECTRUM, ZX81 & ACE by Owen flop, or a product detector, this book specific functions in a variety of Bishop ISBN 0 85934 099 6 will oblige. electronics projects. Book 1 covers Seventeen projects are described, with Other chapter headings give some idea oscillators of all types, monostable full constructional and programming of the coverage: Chapter 3, Functional multivibrators and a "miscellaneous" details for the three computers of the sequence and block diagrams; 4, Power category including power supplies, title. The projects are simple and supplies; 5, Audio 6, rectifiers system diagrams; and simple filters. Book 2 inexpensive, using commonly available Radio Receivers; 7, Radio transmitter and covers amplifiers, more complex filter parts. Included are a pulse detector, five transceiver 8 TV receiver in diagrams; circuits and, the miscellaneous switch keypad, a motor controller, light diagrams; 9, Computer diagrams. category, trigger circuits, a window pen, thermometer and barometer This book an should prove invaluable discriminator and digital logic gates. among others. With minor alterations reference for any student beginning a Except for some items based on the projects could also be used with career in devices electronics, or any older from the UK company Ferranti other Z80 -based computer systems. enthusiast trying to catch up on today's the circuits use common Cv1OS and the For further information on these and solid state 555 configurations. timer chip. All designs are fully other Babani titles contact the Technical Well worth investigating. explained and illustrated and the books Book and Magazine Company Pty Ltd, Our copy from Holt Pty Ltd, would a -Saunders be useful reference for 289-299 Swanston St, Melbourne, Vic. Publishers, PO Box 154, Artarmon, NSW hobbyists. Price is $5.85 each. 3000. Phone (03) 663 3951. 2064. (PGW). á121/73 FROM AMERI IN YOUR HOME, EVERY MONTH, FOR LESS THAN $ 29! Now, 73: Amateur Radio's Technical Journal has a special offer for Electronics Australia readers. For a special introductory price of under A$29, get 73 magazine, a leader in the electronics field for over 23 years. Enjoy 146 pages of: Construction projects. Certificates and awards. Microcomputing applications. International reporting. Satellite news. Operating tips. Product reviews. Contest rules. 73: Amateur Radios's Technical Journal. Subscribe today and enioy our special rate! 4mateta OK! I want a subscriptúon to 73: Amateur Radio's Technical Journal. Please send me 12 issues of 73 for less ab/ US$25 (that's than 529 a yearl), I ch have enclosed a check or money order. US funds drawn surface delivery. on US bank. Please send me 12 issues of 73 for US$55, airmail delivery. Please charge my credit card. Please bill me. American Express O Master VISA Name Card Card Exp. Date Address Signature Post Code Country

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ELECTRONICS Australia, January, 1984 113 ROD IRVING ELECTRONICS 425 HIGH ST, NORTHCOTE 3070 VIC PHONE (03) 489 8866

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He passes without pause to the Funeral BEETHOVEN March in which he wastes little sympathy on the departed or the bereaved. It's all BEETHOVEN very matter of fact and in the second in E Flat major, OP16. Piano Quartet GLENN GOl.1LD< section you'll hear more pugnacity. He SUTHERLAND relents towards the end as if taking a String Trio. Divertimento for final regretful farewell. He disperses the TURINA 4 gloom without delay in a prestissimo in A Minor. New England Piano Quartet Finale throughout which he maintains a Ensemble of Australia. Cherry pianola-like steadiness of tempo and Analog Disc LA Pie/Festival Audiophile touch. 07723. Though often using the wilful opposite of customary treatment Gould certainly That sterling body, the New England has something different to say and says it Ensemble of Australia, actually the Piano - thumbing his nose at posterity and Quartet -in -Residence at the University of futurity if that is the word. And as far as New England in Armidale, NSW, again - I could hear he had at last given up his shows its mettle in this program of well BEETHOVEN habit of singing audibly during his contrasted items. They start with recording. Beethoven's Piano Quartet in E Flat Piano Sonatas Nos. 12 and 13, Glenn The 13th Sonata is subtitled "Sonata in which they perform with impressive Gould. CBS Masterworks Series Analog the manner of a fantasia". Nothing could unanimity of thought and execution. Disc CB321. be better suited to Gould. He starts the First among equals is pianist Wendy first movement with some ungainly Lorenz, whose delicious cream -smooth are the last recordings made by These sounding chords then goes on to a work and sensitive nuancing highly passage that greatly talented but eccentric violently contrasted strict time alla add much to the success of the pianist Glenn Gould. He seemed to marcia. And .there is no questioning his ensemble. But then this is no reflection in playing mostly Bach and delight clarity both of dexterity and thought on her colleagues' excellence for the from anyone else. Beethoven differently whatever you may think of the latter. piano part always tends to stand out in times it Sometimes this came off, other The subtitle tells the tale. Then almost string chamber music. didn't. startlingly comes a fast portion that All the playing is superlatively good His technique was formidable, his could not be played more fiercely or and the sound completely faithful. For imagination vast if often perverse. He faster. It all ends in a delightful fading. the latter much credit is due to the identified himself with the most unlikely Then comes the scherzo played in sound engineer, Max Harding. The artists and composers and usually made strict time (dotted) and taken at speed players all show true insight into the out a good case for himself in the sleeve that also couldn't be faster and full of the spirit of the music and the balance notes written by him that accompanied usual violent contrasts. He still used strict between instruments is always perfect. A his recordings. Yet to a trained ear they time in the third movement, quite Australia should be proud performance always sounded purposely odd, though metronomic in fact and certainly not the to present to the world. on rare occasions blindingly right. way any other pianist I know would On, the reverse side you will find a sonatas are cases in point. present an adagio. Yet it is all strangely string trio by Australian composer These two widely from what was in tender. The recital ends with a fast but Margaret Sutherland which uses much They both differ Beethoven's day true sonata form. The joyless finale with more strict time. The polytonality. It is all very neatly put Sonata might well be considered a whole record may sound odd to most together but if you're looking for a true 12th as it does with a ears but it will not fail to interest. melody you won't find one except in the crooked work starting variations. The clean second movement. A galloping account set of splendidly shows up Gould's beautifully BRAHMS of a motoric finale leads to an effective sound interpretation has the end. clean playing. His air of having been deeply pondered. Of The Four Concertos. Soloists Daniel Turina's A Minor Piano Quartet outstanding interest is his treatment of Barenboim (piano); Isaac Stern and completes the program. Some of its the staccato variation, decidedly odd, Pinchas Zyckerman (violins), and Lynn tunes are a little commonplace but the at the same time oddly convincing. Harrell (cello). All with Zubin Mehta and is always unquestionable but atmosphere the New York Philharmonic. CBS .juicy might well There is nothing light or sprightly about Spanish. Its harmonies Masterworks Analog Discs CBS79410 The movement Gould's Scherzo (2nd mo ement). His appeal to many. second Max37871. is qúite charming but tends to be salon playing is aggressively pe suasive and Spanish. The New Englanders make it all there is nothing gentle abo t the trio - very colourful. And the choice of items which is ,perversely not ally a trio. This handsome issue of the four should achieve popularity with many Gould's reading can only be described as Brahms' Concertos on four boxed analog different tastes. These Cherry Pie/Festival pugnacious where all other pianists I discs should prove very useful for those issues deserve the highest praise. have heard play it lyrically. starting a record library. Among more 116 ELECTRONICS Australia, January, 1984 experienced readers there are bound to Yet it is not a bad work. It has a has the emphasis in exactly th right be those who enthusiastically approve magnificent chief theme (Antar) and place. and others who already own other plenty of healthy vigour. The cover notes Except for one or two items,'none of versions that they prefer. The piano refer to its orientalism but I could hear the songs are hackneyed. Most you will concertos for instance, are both played little of it. I have known the brilliant be hearing for the first time. And if you by Barenboim - very will indeed I might scherzo -like movement for many years are like me you will marvel at the add. But there are sure to be buyers who but have not heard it since a boy. If that delicate skill of Debussy's setting, prefer the Ashkenazy performances sounds paradoxical it is because in his whether serious, flippant, ironic or any while others go back to Backhaus and first London season after World War I other mood you can think of. Some still others to Arrau. But that is always Diaghileff used it as an interlude described the material in the texts, way the with collections. between two short ballets. The others show the effect of the words on Isaac Stern looks after the Violin Eugene conductor, Goossens, then the composer, still ' others are just Concerto admirably but, then again, known as Junior. exercises in melody, all are vastly others might for clamour Huberman and Of the four movements I like the last interesting and enjoyable. many will have other favourites, best. And on the second side you will Souzay, an artist who has never, I irrespective of the improvement in find the excellent Russian Easter imagine, had a bad notice, hates critics sound technique since they were made. Overture, an always exciting and yet gives them a generous program to The Double concerto is given a fine colourful piece. The playing throughout work on. But fair ones, I am sure, will airing by Zuckerman and Harrell (cello). is first class and it is good to see the fine receive his offering with the same delight All the accompaniments, or perhaps Rotterdam Orchestra coming in for a that I did. To singers and non -singers orchestral parts are better words, are turn where the Concertgebouw has had alike I can recommend this with the provided by Mehta and the New York it all its own way for so many years. And greatest enthusiasm. Danton Baldwin is a Philharmonic and whatever you may David Zinman seems to be the sort of competent accompanist but there are think of Mehta's work his on own he is conductor the musicians like playing for. subtleties in the piano parts that undoubtedly a fine In accompanist. the The digital sound is first rate. sometimes elude him. The sound is space available here it is not possible to perfect. comment on any of the works separately but I can thoroughly recommend DEBUSSY the set GUITAR FOLK SONGS to anybody who wants the concertos in compendious form. Chansons. 21 songs sung by Gerard Souzay accompanied by Danton THE GUITAR IS THE SONG - Recital of folk songs Baldwin. DGG Collectors' Series. by John Williams (guitarist) (Analog) 2543813. and an orchestra which includes some grj RIMSKY-KORSAKOV strange instruments. CBS Digital Disc SYMPHONY ?V(i2*AíVTAK, "7: A surprising number of musicians and FM378526. :hakmoni Odle; music lovers are unaware of the .a-. important role songwriting took in Do not be misled by the title into Debussy's work. Indeed his first thinking this record is just a collection of biographer wrote that if Debussy, like tunes picked out in guitar solos by this Hugo Wolf, had written practically splendid performer. On the contrary it is nothing but songs he would still have a series of ingeniously arranged folk remained one of the most "striking and songs from many 'lands which Williams unusual figures in the history of music." integrated into the whole with great skill. Debussy's interest in songwriting Some of the accompaniments use started just about the same time that exotic or old-time instruments with lieder composition was on the wane. gratifying effect. For example, tin True it remained among the great, whistles, a fiddle instead of a violin Wolf and Richard Strauss, but other . (what's the difference?) and plenty of violins too. is RIMSKY-KORSAKOV Germanic composers' attention had There a quatro, charango, started to fade. So too had the guitaron, mandolin and more usual fashiónable vocal recital, most on the ,orchestral instruments. The songs were Symphony No. 2, "Antar". Russian Easter same mode, a bracket gathered in Venezuela, Ethiopia, and Festival Overture. Philips Digital Disc of baroque first, 9500951. Rotterdam Symphony then several German Lieder, and many European and American sources. usually in the second half, The sound is splendidly clean digital. Orchestra conducted by David Zinman. concluding a few odds and ends of French chansons, The balance between soloist and English ballads and suchlike. acompaniment is always sensitively Although Rimsky-Korsakov called this his For conclusion there was usually adjusted - no mean feat this and second symphony it is not strictly something "cute". The singer oddly everything is played with great flair by speaking a symphony at all but a always carried a tiny book hopefully all. Very few of the 14 items are symphonic suite in the manner of unseen in the palm of the hand. Did this hackneyed. Indeed many will be strange Scheherazade. contain the words? Or were the singers to the average listener. They were to I tind it inferior to the latter for many all blessed with perfect pitch and therein me. All are interesting, some are reasons. You hear the main "Antar" was the starting note to remind them? beautiful. theme much too often. Indeed This disc contains some of the most To give an idea of the general quality of whenever R -K has nothing else to say he refined singing in the literature of music, the production, when you have a well just has it played. His habit of constantly music of refinement sung with the known ditty like Shenandoah the setting repeating two -bar phrases gets tiresome utmost sensibility. Most French love their is very original. This should be of value after a while. And more importantly the language and Souzay's pronunciation of to all musicians whether or not they are music hasn't the same attractive every syllable should be a lesson to interested in the guitar or John Williams. voluptuousness as Scheherazade. every aspiring singer. His phrasing always (J.R.)

ELECTRONICS Australia, January, 1984 117 Musical Director of the Los Angeles Records is Tapes Chamber Orchestra and the Y Chamber Symphony of New York, I have come to expect precise playing and sharp, clean Here is the first batch of Compact Discs to be formally reviewed in sound from Gerard Schwarz. To date, these columns. They include Telarc's notorious "1812" and their my judgment has been based on digitally much vaunted "Rite of Spring", together with the Tchaikovsky Fifth sourced analog recordings but in this, his into both from Delos. first compact disc to come my and Handel's "Water Music", hands, the sound comes right up to Although compact discs and players good stories, the "1812" has lived on. expectations: completely clean, have been available for some time in "Capriccio Italien" is Tchaikovsky's completely noise -free and with not a Australia, it has been on a fairly musical impression of Italy, following a trace of congestion. haphazard basis, and not really one on visit to that country and combines In part, of course, this is due to which to try to plan reviews. Now, with snippets of popular songs and dance Schwarz' partiality for small rather than CD players on the shelves and a more tunes, the songs of Venetian gondoliers large orchestras - an attitude that needs predictable supply of discs, we will try to and the more military sounds heard in to be explained when it conflicts with include regular reviews in future issues. Rome. convention but which involves no such All four records below are available The "Cossack Dance" is a popular problem in this particular recording. It through specialist record stores and segment from his otherwise unsuccessful certainly makes for a spacious, although some hifi dealers but, in the event of opera "Mazeppa", completed in 1883. not necessarily a small, sound. difficulty, contact can be made through The orchestral account of the three In the accompanying booklet, Amelia the distributor: PC Stereo Pty Ltd, PO items is well recorded and was Haygood points out the "The Celebrated Box 272, Mount Gravatt, QId 4122. commended as such in the first review. Water Musick" as it was originally called, While it dates back to 1979, the master represents possibly the finest and best was made on the then new Soundstream o. known orchestral music written by Tchaikovsky recorder and is consequently well 13'1 . digital George Frideric Handel (1685-1759). As 1812 up to the standard required for a such, it has retained its popularity since Capriccio Palien compact disc. the early part of the 18th century. Y tw.xf 1 ane' hvn Jlairppt What makes the recording "notorious", Erich Kunnc! Cincinnati Symplwrn ( Aaiw stra It gains its name from the fact that most is the decision by Kunzel and Telarc to of the pieces were written for Royal ,-. fulfill Tchaikovsky's original intention of water parties on the Thames, although it with performing the work out-of-doors, is likely that a few pieces from other orchestra, brass band, church bells and occasions have found their way into the cannon. Telarc duly recorded a carillon "complete" collection. . and cannon separately and mixed them ík,r . t Amelia Haygood quotes an account of .+`: sr,:. into the orchestral master tape, under a Royal barge party on the Thames, and at a very computer control, hosted by George I, from "The Daily substantial level. Courant" of July 19, 1717. The 50 -odd Considering the enormously complex musicians were grouped on a large sound, the LP pressings were very good barge, drifting with the tide alongside the and the compact disc is even better. It Royal barge. George I appreciated their TCHAIKOVSKY will not pose any tracking problems for efforts so much that he requested them indifferent players, as did the analog to repeat the program several times 1812, Op 49. Cappricio Italien, Op 45. pressings, but the huge low -frequency during the leisurely journey. Cossack Dance from Mazeppa. Erich signal from the cannon will certainly Handel's free use of wind instruments Kunzel conducting the Cincinnati pose problems for many amplifier in Water Music and his assumption that Symphony Orchestra. Telarc Compact systems, as per the Telarc's warning on the basic score would be embellished Digital CD -80041. the pack and in the booklet. (Seethe provides scope for the expertise of the discussion in "Forum"). conductor in this area. As a technical exercise, a talking point in 1979, this The program is divided into three Originally recorded and a demonstration of sheer bass -end suites as follows: Suite I in F, pieces 1 to grouping of Tchaikovsky concert power, Telarc's "1812" remains an was released 9; Suite II in D: pieces 10 to 14; Suite Ill in miniatures as an LP -stereo industry benchmark and you may want a G, pieces 15 to 18. Each piece is pressing in that same year and reviewed primarily on that account. On the copy individually listed and timed on the in our February '80 issue. The three items hand, if your interest centres on other inside front cover of the booklet and are all well known -, perhaps too well the music, do be careful with the cannon inserting the disc in the player registers a known for some. during the last couple of minutes of the total playing time of 54 minutes 12 The 1812 Overture was composed by overture. (W.N.W.) a rather unwilling Tchaikovsky to seconds - reasonable useage of a commemorate the 25th anniversary of nominal 60 -minute disc. I mistaken, this is the accession of Tsar Alexander II, and HANDEL Unless am much the opening of the Cathedral of Christ going to prove a very popular disc. Its the Redeemer. Almost of necessity, his The Water Music (Complete). Gerard complete clarity and transparency would theme centred on the defeat of the Schwarz conducting the Los Angeles make it an excellent choice for French invaders, and his mix of folk Chamber Orchestra. Delos compact demonstration purposes. It holds tunes, the Marseillaise, cannons, and compact disc D/CD 3010. interest for the musically inclined and church bells signalling victory, provides pleasant listening for those who perpetuated Russian folklore rather than are not. A good one to include among the real defeat of the French by the Whether as the virtuoso trumpeter of your initial purchases of compact discs. Russian winter. But, like many other earlier years or, more recently, as (W.N.W.) 118 ELECTRONICS Australia, January, 1984 plug-in Data Modem +'Phone still only $ 11,f

300 `= 'PHONE ,114'110 DUPLEX r , SI t M J . ANSWERM MopEM POWER

Now with added phone' Australia's first direct Dataphone lI's features: Australia's fastest -selling direct data modem is now modem to meet new * Simple plug-in connection - no delay even better value than ever! or fee. Not only have we improved its performance Telecom regulations' Built -In pushbutton and reliability, but we've added a high * phone with last number re -dial. quality pushbutton type electronic phone as Dick Smith's Dataphone was the first to well - for added convenience. It even has meet the 1982 Telecom regulations * Full duplex, Answer/Originate opera- last-number-redíal. And all this is at no permitting privately owned direct -coupled tion for convenience. extra charge! data modems. It was also the first to break * Operates at the standard data rate of through the $200 price barrier, 300 baud. No delays - install it opening the way for owners of virtually any * Designed in Australia and fully autho- yourself personal computer to communicate with rised by Telecom. Besides the other computers over the switched Uses standard RS -232C added convenience, the built-in telephone network. * computer phone brings a further dramatic bonus: interface. installing the Dataphone II is now simply a Here's your chance to * Outstanding value for money at only matter of plugging into a standard Telecom join the many thousands of happy $199! phone socket. It's legal and there's no delay Dataphone users, with this improved and or fee to pay! upgraded model! Cat X-3272 Telecom Authorisation .No. C83/37/1080 DICK SMITH Electronics See page 98 for full address details DSE/Aóab/PAI differences always favour the latter: records ah Tap Continued better texture in the treble and cleaner bass due in part, 1 feel sure, to the elimination of acoustic feedback from breach created by the sudden illness of the loudspeakers. DELOS DIGITAL MASTER SERIES Toscannini who was, in turn, filling in for While the context has changed, the Stokowski. Ormandy made such an observation in our June '82 issue still impression that he became Musical SYME f071` y Q5 applies: In short, well worth Director in 1936 and held the post until consideration, if you have a place for it in 1980. EL CENE your collection. (W.N.W.) (& '1ANt7YTHE And what better work for an occasion that virtually brought that association to b j a close than the Tchaikovsky 5th, with its 7.RCHEsrg STRAVINSKY familiar theme in the second movement THE RITE OF SPRING and its waltz -like third movement that LOON MAAZEL might as easily have come out of "Swan THE CLEVELAND ORCHESTRA Lake" or "Sleeping Beauty". Tchaikovsky himself felt self-conscious about the work for a time ("a certain gaudiness and artificiality") but later reacted much more warmly to it. TCHAIKOVSKY Those who do not know the work well, will find it very Iistenable and the No.5 in E minor. Op64. Symphony accompanying booklet gives a detailed the Eugene Ormandy conducting insight into the music by Herbert Philadelphia Orchestra. Delos compact Kupferberg. disc D/CD 3015. In a further note, producer of the This particular performance was recording, Harold Lawrence points out recorded in April 1981 in the historic that Tchaikovsky's 5th Symphony STRAVINSKY in "old Met" in Philadelphia. A one-time exploits the full dynamic spectrum the must spacious 4500 -seat opera house, built in first four minutes, although one The Rite of Spring (Le Sacre du Delos is to handle 1908 by Oscar Hammerstein, the Met add that the approach Printemps). Lorin Maazel conducting the rather than became a second home for the dynamic range with restraint Cleveland Orchestra. Telarc Compact Metropolitan Opera and a recording the sometimes ostentation of Telarc. Disc CD -80054. venue for the late Leopold Stokowski. When we reviewed the LP pressing in the June '82 issue, we commended the This recording was reviewed in the But, with the surrounding area falling and March '81 issue as a digitally sourced into depression, the building lost favour performance by conductor orchestra alike, as well ás the recording analog pressing and much of what we until "rediscovered" in 1977 as a by three B&K said on that occasion still applies. desirable recording venue for major itself, captured ranged in frónt of the As a challenge to conductor, works - environment notwithstanding. microphones and a Soundstream digital musicians, and engineers alike, For conductor Eugene Ormandy, th;s orchestra Stravinsky's "Rite of Spring" was a natural particular performance must have recorder. evaluation still holds but, once addition, at the time, to Telarc's digitally sparked many memories. It was back in That running Delos' best from 1982 sourced repertoire, with its periods of October 1931 that he first conducted the again, against their new CD version, the subtle almost whisper quietness demanding Philadelphia Orchestra, stepping into a

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120 ELECTRONICS Australia, January, 1984 minimal noise level, its tonal complexities elsewhere demanding low Electronics Australia intermodulation, and its loud drumbeats requiring freedom from bass -end overload. The booklet which comes with the JANUARY CROSSWORD compact disc carries the same notes by Michael Murray as did the LP jacket, dealing principally with the composer 2 3 4 5 6 7 8 and the work. It was composed originally as a ballet score dramatising ancient Slavonic fertility rites and so 10 scandalised the audience at its first performance in May 1913 at the Ballets Russes that it caused a riot of protest. Some months later it was presented 11 12 13 again as a concert performance and, this time, conscious of the score rather than 14 15 the source of the inspiration, the 16 17 18 audience gave a standing ovation. In competition with about 20 other versions, Maazel's reading attracted its share of comment and criticism, 19 20 21 22 23 including the observation quoted in our March '81 review that Maazel had shown a tendency to turn Stravinsky's rather "mechanistic and fragmented music" into 24 25 26 27 a kind "Debussy with a beat". of 28 29 However the same critic had to concede that the recording itself was technically 30 31 outstanding, the best yet and a "must hear" disc. Certainly, since then, it has received frequent mention in lists of top hifi demonstration pressings. 32 33 In view of that, it was interesting to run the original LP and the CD version in parallel, switching from one to the other ACROSS DOWN by way of an A -B test. Yes, the LP is 1. Range of frequencies. (9) Developed across an good, but the compact disc is better, 6. Gas used in globes. (5) inductor (4,1,1,1) with not even the occasional surface 9. Sort of arrest prevented 2. Logic circuit. (3,4) click, and with even better transparency by an electronic 3. Kind of antenna. (4) in the more complex passages. pacemaker. (7) 4. Transfer for panel These days, with so many titles being 10. Antennae. (7) labelling. (5) issued on compact disc, Telarc face 11. Test undertaken by 5. Listening device. (9) would-be radio operators. 6. The motion of air at an much stiffer competition but I imagine that CD -80054 will attract quite a few. (4) electrified point. (4) buyers, curious to have the means of 12. Radar screen images. (5) 7. Type of equaliser. (7) comparing LP and CD versions. (W.N.W.) 13. Blacken by overheating. 8. Air inlet (7) (4) 14. Frequency unit. (5) 16. Cables carrying input 15. Bare insulated wire. (5) Solution for December signals. (7) 17. Device utilising 18. The kind of scanner which photovoltaic effect. (5,4) DICEEl©ONDÑCÉORS uses a photoelectric cell. 19. What the crossover O A X (7) network did to the M A GI NG WARAD A Y 19. Type of data display. (7) frequencies. (7) 21. Electrode of a transistor. 20. Element present in some D O P G O A I P FOUL (7) semiconductors. (7) ©o©OJT_TSAaE 24. Electric unit. (4) 2 2. Operational zone for Parts of valves. (5) medical electronics: (7) A 25. O.RE©0©DIT 27. Unipolar multielectrode 23. Appropriate place for a s_© UP S semiconductor devices. speaker. (7) A R A mCI L O©E0CI (4) 26. Tape recorders. (5) E Cig C110 T O© 30. Degenerate. (7) 28. Kind of current commonly A R oDI UMW BMUE 31. Pulse detector. (7) the cause of losses. (4) 32. Simulates a loudspeaker 29. Rough edge in Scottish EMI load.. (5) speakers ? (4) R T E A 33. Coherent ray. (5,4). SE C O NDARYCELL

ELECTRONICS Australia, January, 1984 121 Microbee-No.1 for co T. ters Jaycar -No.1 for Micro D Jaycar Electronic Agencies is proud to announce the 1984 range of microbee computers - at new low prices!! The microbee Series 2 machines are ALL supplied with built-in communications capability, dual font 80 character by 24 line & 65 character by 16 line displays. Remember, your microbee is obsolete -proof with g'teed upward riucrobeé expandability.

nsis,ubrr r.- . . x . . s' h4'Ciimra7Ca) . G ingerobee

microbee Series 2 EXPERIMENTER

8y popular request, the low cost microbee Series 2 Experimenter has been designed for those who are starting out in the fascinating world of computers or those who want to share the fascination of exploring the exciting developments in the fast moving MICRO WORLD. Demand for protects using the microbe, is so great that 'Electronics Today' are now planning to run a microbee protect every month Airing 1984, So far ETI has described the light pen, EPROM programmer, a radio TTY printer, the world's first home facsimile receiver and ROM expander board for the microbee. Virtually every local computer magazine has run reviews and/or columns devoted entirely to the microtsee. If you want to be part of the MICROCOMPUTER GENERATION in 1984 then Cat. XE-4000, x399 microbee Series 2 Expenmenter is the ideal starting point. Of COUrx you can expand your microbee Series 2 Expenmenter as your need grows. Note: the software that is supplied with each microbee Series 2 EDUCATOR machine - at no extra charge!!

The microbee Series 2 was specifically designed to serve the needs of the EDUCATION MARKET. Let's face it, the primary non -business use for most personal microcomputers is to Increase our learning capabilities either about computers (computer awareness) or about life Itself. mrcrolsee Series 2 has now been officially approved by Education Departments M NSW, WA and Queensland and is being carefully considered in virtually all other states and by the National Schools Commission at the time this ad was going to press. The microbee Educator uses BATTERY BACKED NONVOLATILE CMOS RAM so your programs are saved in the microbee Series 2 after the power is switched off. Students can bring the microbee Series 2 Educator horse from school to complete Cat. XE-4050 s449 assignments ready for class the next day. With the optional BEEMODEM you can use your microbee Series 2 Educator to talk to other computers or information networks. microbee Series 2 PERSONAL COMMUNICATOR

With Me BUILTIN WORDBEE in ROM as well as MICROWORLD BASIC and NETWORKING, the Personal Communicator is a powerful home computer ideal for virtually any home use from wordprocesssng, spreadsheet analysis, eduction and even experimentation with the computer concepts as they evolve during the year. With the optional BEEMODEM you can send Cat. XE-4100 WORDBEE files across any telephone line to another computer. Bee the first on your block to here home telex) s499 microbee Series 2 ADVANCED PERSONAL COMPUTER

Now for the first time in Australia: the microbee Series 2 Advanced Personal Computer with 400K disk drive. Then add bundled world class software such as CP/M, MICROSOFT BASIC, MULTIPLAN, WORDSTAR and a $1795 powerful library of support programs and you will have some Idea as to why the microbe, Series 2 Advanced Personal Computer is the mmt powerful and best price/performance computer in Its class. What's more any existing microbee owner can convert his microbee to the Series 2 APC at any time. 51495 DUAL 400K DISK DRIVE The microbee Series 2 AFC uses the popular Z80 microprocessor and runs standard CP/M so that users have access to the vast library of CP,M software available world wide. MICROSOFT BASIC is now supplied on disk. WORDSTAR, according to independent surveys now accounts for 50% of ALL word processing software now in use so the designen of the Series 2 APC Cat. XE-4200 Cat. XE-4300 decided to purchase the OEM rights for your benefit. MULTIPLAN is considered by many to be one of the most powerful SINGLE 400K DISK DRIVE spreadsheets yet produced for the microcomputer. MICROBEE KITS-KITS-KITS-KITS-KITS-KITS-KITS BOl LLIAIT! ETI 733 RTTY Convertor. Ref: ETI April 1983. This simple project allows you to hook up DIRECT your MicroBee to a HF receiver and print radio teletype messages on a monitor screen. CONNECT MODEM Listen to world news for F RE Elf KEY FEATURES Cat. KE 4654 ONLY 517.95 DIRECT ATTACH AUTO ANSWER MODEM ETI 649 MicroBee Light Pen. Ref: ETI August 1983. This simple, low cost device plugs 300 BPS FULL DUPLEX (CCITT V21) polo the Bee's 8 bit port. The "pen" gives you an entry into the world of light pens and 1200 BPS HALF DUPLEX (CCITT V23) interactive software. 75 BPS BACK CHANNEL (FULL V23) Cat KE 4656 SHORTFORM S19.50 AUTO DIAL 5 SPECIAL PROBE CASE TO SUIT (as specified In ETI article) Cat. HB 6400 519.95 BELL FREOUENCIES INCLUDED TELECOM APPROVED 'R ETI 668 MicroBee EPROM Programmer. Ref: ETI February 1983. This simple, low cost 1 YEAR WARRANTY programmer ' I UNIVERSAL DATA MODEM EPROM just plugs into the Bee's I/O port and enables you to save programs in NO ADJUSTABLE CIRCUITRY any of the 5 different common EPROM% available 12716, 2532, 2732, 2732A, 2764). Kit DESIGNED IN AUSTRALIA sin air 11 comes complete with 'Personality' plug and all IC sockets. MADE IN AUSTRALIA Cat KE4650 $39.95 THIS IS NOTA "TOY - Parallel Interface Kit for the MicroBee. Includes 15 pin 'D plug - add $15.00 if Centronics r .ti plug required. Cat KE7017 $15.00 Jaycar has made a bulk purchase to bring them to you at the incredibly low price of 5399. Amazing value fora FULL DUPLEX unit Cat YCC.1350 122 ELECTRONICS Australia, January, 1984 UtIBEATABLE WILLIE

LOG -GENERAL PURPOSE INDEX This program is designed to suit a wide range of microbeé records where Indexing land later searching) can be on one or two words, or on a string of up to 15 characters. Each record consists of its index heading, plus up to 12 lines of text Each line SOFTWARE can contain up to 41 characters. Cat. XE6890 515.95 DISASSEMBLER By Dreamcards BASIC TUTOR IAL- ASTEROIDS PLUS - MYTEK MINE DROP Some may say "Not another Disassembler". But Is a super teaching aid for any classroom. Basic Asteroids Plus is one of the finest high resolution You are a tank running around a maze gathering this one has a difference. It allows you to set out Tutorial is a set of 9 interactive exercises designed graphic arcade games available for the MicroBee all the supplies you Can. It sounds easy, but you where the data fields are so the computer is saving for teaching Basic to the computer novice. No Computer. It features 3-D point by point resolu have a guided missile hot on your trail. Your time, not rying to disassemble data A program previous knowledge is assumed. Basic Tutorial lion graphics, shields, sound effects, intelligent only defence is a remote controlled mine which you shouldn't be without. uses a unique double screen technique to display ob)ects, guided missiles, black holes and a score you drop and explode at will. A very fast joy- Cat. XE-6915 515,00 both the normal computer output and the tuto- board. If you enjoy playing computer games, you stick or key controlled game. CHEAPIE By Dreamcards rial exercises at the one time. This allows the will be captivated by Asteroids Plus. Cat XE6960 S14.95 normal way. Two top quality programs for the poce of one. student to use the MicroBee in the Cat. XE.6297 522.50 PENETRATOR tutorial instructions appear In the lower The best Hangman we've seen yet on side A anti while the 'BEEZ 80 - MYTEK A low resolution graphic version of the popular screen. a superb version of Battleship on side B. Both half of the "Scrambler". You must defeat rockets Cat XE6860 520.00 This secret code disasembler will disassemble game the have excellent graphics. any code sequence. Nothing is Illegal. It will and bomb the radars in an effort to get to the Cat. XE-6920 515.00 MACHINE CODE TUTORIAL - MYTEK allow you to program with codes that no other next stage which is even harder. This game can be CANNIBALS AND MISSIONARIES Consists of 8 Interactive exercises designed for disassembler can decipher! either controlled by a Joystick or by keys. Being and related The old logic problem game of transferring 3 teaching machine code programming Cat XE.6298 520.00 in Lores graphics It is a very fast game. If you are as they apply to the MicroBee computer. bored with same land pattern you devise Cannibals and 3 Missionaries Iron one side of a topics SPACE INVADERS the can Only a general knowledge of the BASIC language your own. river to the other in a boat that holds two. If One of the most popular programmes ever released. is assumed. Machine Code Tutorial is designed to at X E-6955 519.95 there are more Cannibals than Missionaries on This version was written especially for the Micro - bridge the gap bewteen BASIC programming either side at any time the Cannibal* revert to Bee. SPACE PATROL and use typical their favourite form of feeding. and being able to understand Cat X5.6030 514.95 A lot like Penetrator but in high resolution Cat. XE-6925 514.95 Z80 manuals. graphics. You must battle your way through Cet. XE-6655 S25.00 COMPOSER BEE FORTH the various stages where at the last stage you have This is a very well written program for music. A new language for the MicroBee. Comes comp- four chances of blowing up a neutron bomb This program allows you to compose, play, BUDGET -SPREADSHEET lete with Interpreter on one side of the tape and shelter. If you are successful, the next round is edit transpose as well es being able to load and This program is designed to speed up and simplify supporting programs on the other side. As well a lot harder. XE-6950 516.95 save your music. A program that has been a long the task of framing a usable financial budget as this it includes a very well written, bound Cat. time in the writing and well worth buying. Applications range from personal or household manual. Cat. XE-6930 522.50 to small business finances. A quality program. Cat XE-6965 545.00 METEOR RESCUE - MYTEK Cat XE-6850 S15.95 WORD ADVENTURE Your mission is to rescue stranded astronauts. You are the commander the Landing Module A program with very good graphics using little PSYCHOTEC By Draamcards of DECODE is Psychotec provides a striking example of art- docked in space with the mother ship. It your characters to entice the user to think what word Bait decoder and listing formatter ificial intelligence, allowing a dialogue in English responsibility to guide the landing module is either a synonym, antonym or homonym of the will be an invaluable aid to any This programme between computer and operator, the computer through a meteor field, down to the surface of word they are showing Everytime you get it steps in understanding machine one taking first playing the role of psychiatrist and the operator the planet, to land safely on a landing pad. An wrong you ale given more clues. After the clues proven code or wants to expand their library of a astronaut will then run to landing module run out you must face the Dragon when you must being "patient" on the couch. Leaves other your machine code routines. Decode will la) print "similar" types for dead. and you will blast off. You must use your lasers spell the word he is holding correctly before you. itfhtsedded machine code routines fully and Cat XE-6935 S14.95 Cat XE-6875 $15.95 If necessary and dock with the mother ship accurately (b) print all unprintable characters MERLIN By Dreamcards again. A total of six astronauts must be shuff. PONTOON lc) provide a clearer, easier to read listing and led to the mother ship. Merlin Is a 32K adventure set in England during A quality fast moving card game where up to 6 send all output to a printer if so required. ED Cat. XE-7020 517.50 the dark ages. task is search players can play against the computer who Is ASM Is not rewired. Your to through the hanker. Cat XE-8765 $15.95 dark forest inhabited by robbers, outlaws and Cat XE-6940 514.95 creatures with awesome magic powers to find a CORVILLE CASTLE legendary sword. An excellent adventure. DATABEE Corville Castle is an adventure which will take Cat XE-6870 525.00 you to a far away place pf mystic castles, fierce MUSIC MYTEK This program is a well written data base manage. -B - monsters and evil warlocks. You must enter the MuslcB a resent system that utilised the MicroBee to its PROGRAMMING HINTS Is music Composer/Editor that lets you warlocks castle and find some dark secret which fullest to provide a Data Management System Consists of a collection of modules which you create and save music and sound effects with a will help you to destroy the warlock. But tethem, similar to those found on larger and more expen- may use to Improve your own BASIC flexibility that makes chopsticks of the Basic programs. have large They bet, you only until dusk. PLAY command. Musict is a great way to learn sive systems. This comes complete with are all linked together under a menu driven Cat. XE-6285 516.95 and play music I Comprehensive instructions are bound manual. display which allows you to RUN or LIST each included. Cat. XE-6945 519.95 module to see how they work. Cat XE.7010 520.00 Cat XE6895 514.95 TRSBEE - MYTEK TRSBEE is a package of three programs that DEFENDER - FROM MYTEK loads TRS80 Model 1 and 3 program tapes Into NEW SOFTWARE This long awaited program is finally available. the MicroBee without any additional hardware. Defender needs no introduction. The Defender arcade game is one most Although some program editing will still be re. of the popular ever pro. duced and the Mytek version is brilliant, rival for Asteroids quired prior to their running, the majority of a Plus. FOR JANUARY Cat. XE.7036 522.50 program typing time is saved by TRSBEE. The DESTROYER first program loads TRS80 BASIC programs You are the UFO and you must destroy the enemy city buildings before into MlcroWorld BASIC. Most prgrarrs may then KING KONG - horn MYTEK you Can land. You have no control over the UFO except for the three be edited and run. The second program in the Just like the son gane of a cmil, name. The game canons Of several bombs on every pass you make over the city. But beware the UFO gets package loads any TRS80 machine code file hones which you must cimakte to rescue tour sweetheart Iron Kona lower with every pass Good graphics and sound. into MicroBee memory. The third program E.ollenly phKs end sound. Joystick compaade. Cat XE-7048 $14.95 Cab XE.7061 *20.00 COULOMBS LAW loads TRS80 assembler files into the MicroBee CHOPPER - from MYTEK EDITOR/ASSEMBLER. Any TRS80 Model 1 This program is another in the series of Physics simulations. The first A tat An necked game whch must rate as one of Mytek's best. You part is a tutorial and the second is a simulation of the experiment. or 3 tape may be loaded. TRSBEE opens up hoe full control of a helicopter and rou must fly over enemy tors to Cat XE7049 $14.95 a whole new world of possible software on your rescue your ellin. Fast realistic graphics and es cellent sound. MicroBee! Cat 0E4055 $20.00 BACKGAMMON - FROM MYTEK Cat. XE7005 530.00 SKETCHPAD This game conforms exactly to that set down in the official rules of the A progron to help you design your own P.0 CO chaatert Simple can International Backgammon Association, including the rules of doubling HOUSEHOLD REGISTER mantis allow easy drawing of circles. polygons and bon etc These then and scoring. can be dumped to tape to be used in a future program. Canes complete Cat XE-7050 $17,50 This program will simplify the task of determino manual POOLS AND LOTTO the value your home's for x5.7056 95 of contents insurance Gmel 519 Two programs to help make life easier for the.Pools and Lotto enthusiast. purposes, as well as providing descriptions of all PRINTERS MATE The first program chooses your numbers for the week and the second listed items In the event of their loss or destruc- This Drogran is two screen dump programs to suit CPBu MX80. DT80. program allows you to input your numbers into a program and when tion. Effects are catalogued by name, description BODP and F 0000 printer. One program o e oreen dump utility wniR the memory in hex and ASCII Lotto night anises you can input the winning numbers and the computer and value. Nine separate rooms se provided, other prints out contents both idenmel chw,a n A must for use with printers. will check your Lotto for sou. and up to 28 items may be listed in each. Cat X(7051 517.50 Cat %5.7045 514.95 Cat XE-7000 515.95 DUO - ONE WONDER WORDS STAT PACK - STATISTICS Another two programs for the proe of one horn Dreamcab One aide This program allows you to input 20 words and the computer will create This program is a general purpose graph plotting. now poker. and the Other is Casino which is a tern reel poker machine. a Wonder Word puzzle. This can be either sent to a printer or solved on the linear regression, line of best fit and correlation mom use Hirer graM1cs E xcenent value screen or let the computer solve it. Just the program for Wonder Word 516.95 program. It features a Ftest of significance for Cat 0E4052 enthusiasts. the correlation coefficient and, if no evidence of EXTENDED TURTLE Cat. %E-7046 514.95 A "Turtle' program when has been writtenn by a fibber an d has bbeen correlation is found, a determination of minimum GEO-TECH DRAWING seveesi months n the writing This is one of the Of.Turtle programs sample size is performed. This is the first tape in a series to assist students in grasping the funda m,tn a ao enemy written manual with X E-8999 nritten ata norte, complete peg menials geometric technical It uses good graphics Cat 514.95 men, hNptul Aaw.na of and drawing. with Cat XE.7051 529.50 excellent explanations. Cat. XE.7047 514.95

I ng ncorporati NUMBER 1 FOR KITS ELECTRONIC AGENCIES POST AND PACKING CHARGES 55 59.99 510 S24.99 Mycar - 151.50) - 153.201 Mai I Order S25 - 549.99 154.50) 550 - 599.99 156.501 SHOWROOMS SYDNEY 5100 - S198 158.00) Over $199 (510) By "Free INSURANCE for Road & Registered Post over 117 YORK STREET - PHONE: (021 264 6688 and (021 267 1614 5200" All heavy or bulky items lover 20kg.) sent Comet Road Freight 512.00 anywhere TELEX: 72293 CARLINGFORD in Australia. Cnr, CARLINGFORD & PENNANT HILLS ROAD - PHONE: (021 872 4444 SHOP HOURS CARLINGFORD, CONCORD & HURSTVILLE Mon - Fri gam - 5.30pm: Sat - 9am - 12pm: Thurs night 8.30pm CONCORD SHOP HOURS SYDNEY BAN KCARD 115 - 117 PARRAMATTA ROAD - PHONE: (021 745 3077 Mon - Fri 8.30am - 5,30pm. Sat - 8.30am - 12pm: Thurs night 8.30pnt HURSTVILLE 121 FOREST ROAD- PHONE: 10215707000 MAIL ORDERS AND CORRESPONDENCE: P.O. Box 185, Concord, 2137. Via Your Phone

ELECTRONICS Australia, January, 1984 123 will not run on the Junior without Mic modification, but it is expected that as version 2.1 becomes available for the larger machines, the line will be completely software compatible, subject IBM unveils the PC Junior only to memory constraints. Software available for the system at the The long-awaited smaller version of keyboard cable is available if required. time of launch includes the Easywriter the IBM Personal Computer has been The enhanced version of the PC Junior 1.5 word processing program, Software released in the United States. Known as includes 128K of RAM and a built-in half - Publishing Corporation's "PFS File and the "Peanut" before its release, the new height 13cm disk drive with a storage Report" system, Microsoft Basic, Logo, a "PC Junior" is available in two versions, capacity of 360K. It is expected to sell for home budgeting program and calendar both much cheaper (in the US) than the $US1,239. It also includes peripheral and a number of games. PC. ports, expansion slots and the cordless Some commentators believe that IBM Both versions are based on the Intel keyboard. will initially be unable to meet the 8088 microprocessor and run MS PC - The operating system requires 24K of demand for the PC Junior. Estimates of DOS 2.1 (not version 1.1 or 2.0, currently RAM, and excluding the screen buffer 1984 production range from 500,000 to used by the IBM PC and its competitors). and Basic storage area, only 18K of 600,000, far short of likely demand, and The basic version is expected to sell for usable memory is available in the basic before Christmas some dealers were around $US669 and includes 64K of version of the Junior, or 82K in the restricted to as few as 10 units. Delivery RAM, of which 16K is dedicated to the enhanced version. The basic version delays for the larger PC are still around 6 screen, and 64K of ROM. handles only a 40 column text display to 8 weeks in some parts of the United Two cartridge slots are provided for and needs the 64K memory expansion States, and speculation is that IBM plug-in software and there are also ports module to handle 80 column displays. announced the Junior prematurely to for a printer, disk drive, modem and Expansion capability is limited, with ensure that prospective customers did joysticks. A novel feature is the 62 -key only three slots available to take a colour not buy competitor's products during keyboard, which uses an infrared link graphics display adapter, disk drive the Christmas season. Given the likely rather than a connecting cable and so is controller, and communications level of demand for the PC Junior and truly detachable. Operation of the interface. slow deliveries in the US, it will probably infrared link requires a direct line of sight Because of the use of PC DOS 2.1, be a long time before the machine is to the logic unit, and an optional existing software for the IBM PC and XT available in Australia.

computer system claimed to be the controlled by an additional "service SME systems fastest and most flexible multiprocessor processor". system currently available. A unique feature of the system is that it new Able to support up to seven users and is capable of downloading different releases four printers or other peripherals, the versions of CP/M to individual users. In, MPU-700 allows equal speed of access this way both 8 -bit and 16 -bit software multiuser processor to each user by providing separate can be run simultaneously by Z80 -based processors and memory for each and 8086 -based processors respectively. Australian computer manufacturer SME application. Mass storage, printers, The processors operate in parallel, Systems Pty Ltd has released the Unicorn graphics displays and other peripherals sharing the same system resources and MPU-700, an advanced seven -user are shared between all users and data files. A wide range of options is available, including extended I/O communications boards, A/D and D/A interfaces and high resolution colour graphics boards. Expansion facilities are also available to extend the MPU-700 to a 16 user system. with up to 512MB of disk storage. 3 Although not widely known outside their own field SME have manufactured and sold over 300 systems during the past two years from its Unicorn and .~1~1~1..1111.1.0.110. MPU-100 series, most of which have found their way into scientific and industrial sites "where power, speed and reliability are key factors" says SME Systems Managing Director Mike Pratt. ""%ígow In addition to fully built-up systems 11" SME also offer a range of 20 S-100 boards, including the latest release, a set r of high resolution colour graphics display controller boards. 1 For further information contact SME Systems at 22 Queen St, Mitcham, Vic. 3132. Phone (03) 874 3666. }

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TI user groups going strong Texas Instruments' announcement that a full day workshop on the first Saturday it is discontinuing production of the of February, following the success of last TI -99/4A and getting out of the home year's effort. The group also publishes a computer business has not fazed Shane comprehensive newsletter and New hand held Anderson, the national co-ordinator of maintains a software library and TI -99/4A user groups. Along with their "Programmers Crisis Line" to provide computer from ISI withdrawal from the market, TI has assistance over the telephone. announced that third -party vendors will While the all day workshop will MSI Data Australia Pty Ltd now has be be permitted to supply software and held in Sydney, TI -99/4A users groups are available a hand-held computer, said to peripherals for the unit, a turn -around also in Brisbane, Canberra, Melbourne, be ideal for sales order entry, inventory, which may give a new lease of life to the Adelaide, Hobart and Perth. The payroll reporting and other small scale Sydney system. group has the details, at PO Box 149, data collection uses where small size TI users groups in Sydney are planning Pennant Hills, N$W, and convenient calculator -like features 2120. are required. The MSI-55 has a 12 character liquid crystal display and a 4K CMOS memory Super -80 software and tutorials and uses wristwatch -type batteries. An Bemak Pty Ltd is a Canberra based programming. acoustic telephone coupler is built-in, supplier of software for the Super -80 In addition to software and the making the system completely self- computer, with a product range which planned correspondence course Bemak contained. includes games, programmer's utilities has available information on overhauling For further information and details of and a word processing program. The and servicing the Super -80, which it will other MSI models contact Graham company is currently investigating the make available to customers free of Boulton, MSI Data Australia Pty Ltd, Cnr extent of interest in learning Z80 charge. Welch Street and Pacific Highway, assembly language on the Super -80. If For further information on software or Underwood, Qld, 4119. Phone (07) 341 sufficient interest is shown Bemak plans for details of the proposed programming 1551. to run a correspondence course next course contact Bemak Pty Ltd, PO Box year to cover the ins and outs of Z80 218, Belconnen, ACT, 2616.

For System 8OTM,TRS-8OTM Model I/III ° I

and Colour Computer owners: a°r á'Z ° Ór4{Gal 260 ONE BIG ISSUE OF MICRO -80 MAGAZINE FREE! If you own one of these computers,P , you should be readingMICRO-80 magazine,g theh magazine not onlyo y written by enthusiasts, but actual owners and operators of the 50e same computers you use. . /1G the MICRO -80 understands your needs, is vital reading from cover to cover and oj eaye o5e1' features six new programs in each issue with full operating instructions. o An analysis of each program's structure and operation is included to a_j'e'C' 1 . \e help you improve your own programming capabilities. O 0.5/ Instructional articles on programming techniques, hardware ,em0/ co ° improvements and answers to readers' problems are also 55/ °ael 4lGoae published each month. at.,o% 0 ANOTHER MICRO -80 PLUS ,-.0,..... e ° 5e ' >5, Readers can purchase a wide range of software and .v.5` yer. e,Je g0 hardware for their systems at keen prices. ose/e5ee 0 S ado d e diof ètí9 X55. DON'T DELAY, ACT TODAY maì4e3ó òat tip ISO' óá `. ,4 eg 4 Either telephone your order on j/ ok' e4\yè l', 7244 (4 lines) or send in the coupon today. L_211,\4S. ELECTRONICS Australia, January, 1984 125 Micronews Problem -solving 1 software The Australian Industrial Research and Development Incentives Board (AIRDIB) has approved an application from Kingdom Pty Ltd of Ryde, NSW, for financial assistance to research and develop "a revolutionary new way of using a computer". It is claimed that the new software, called "Orion", will have the ability to solve a wide range of numerical and logical problems without conventional programming. 4v Unlike software such as fourth generation languages and other program generating systems, Orion does not produce programs from a library of stored routines. The program is written in a in, providing 320K of storage, and standard computer language and Sanyo launches high resolution (600 x 200) graphics high operates to build up a solution based on are available using an optional resolution video monitor. a network of facts and rules which IBM competitor connect these facts. "We see the MBC 555 as a real The software allows models of a Sanyo Data Systems Pty Ltd alternative to IBM's persónal problem to be built from independent launched its answer to the IBM PC last computer" said Mark Johnson, statements of known facts. The month. Called the MBC 555, the new managing director of Sanyo Data computer then determines the links and machine is seen as a separate product Systems. "It is compatible with the relationships between the known from the company's range of business IBM, yet offers the additional variables and if the model is complete, computers, and is described as a "true incentive of being half the cost of the produces a numeric solution. If the personal computer'. IBM". model is incomplete the computer will Features of the system include an For further information contact indicate the deficiencies and accept 8088 processor and 128K bytes, of Sanyo Data Systems Pty Ltd, 127 "what if" questions to complete the memory, expandable on -board to Walker St, North Sydney, NSW 2060. model. 256K. Two 13cm disk drives are built (02) 929 4644.

The DataSafe consists of up to 64K Non-volatile storage with the "Datasafe" bytes of low power CMOS RAM powered by a lithium battery and. which can be . A new Australian company, JED powered memory module enclosed in a diecast metal box. Overall Microprocessors Pty Ltd, has released used with any computer, dedicated dimensions are 11.5 x 6 x 3cm and their "DataSafe",'a self-contained battery controller or data logging equipment. connection is by means of a 15 -pin D - type connector. Three output lines and one input line carry enable signals and enn shift data into the store from the parallel .Kw,"pr-.4 .¿+- port of any computer system. 4'10 r``E.co-a ç'',.5»,» ..j-.1.oa Coupled with simple software routines the DataSafe can replace cassette tapes, in 11:21""" . EPROMs and bubble memories any p -i application which requires long-term ...1 :talo"` storage of data. In a data logging c7 1K t +L' application, for example, data can be LOwG o read in over a period of weeks and then read out by plugging the unit into the parallel port of an office computer. Data can be maintained for over a year on battery power. DataSafe units are available in 8, 16, 32 and 64K byte capacities, and a version is - also available with two sockets to allow the transportation of 2764 EPROMs.

' For further information contact JED Microprocessors Pty Ltd, PO Box 30, Boronia, Vic, 3155. Phone (03) 762 3308.

126 ELECTRONICS Australia, January, 1984 TO THE CT ONICALLY MINDED. (Professionals, Hobbyists, Students & Enthusiasts:) We carry a wide range of Multimeters, Calculators, Soldering tools, Transformers, Cables, Instrument boxes, Computer Connectors, TV Aerials, Components and just about anything you may require.

MULTI - CALCULATORS SOLDERING METERS TOOLS CASIO RADIO HEWLETT UNIVERSITY WELLER PACKARD FLUKE ROYEL HILLS TEXAS DESPATCH TV . INST. AERIAL y SERVICE "QUALITY COMES FIRST" has been our trading 869 George St., Sydney principle for many years. This enables us to give you' the NSW 2000 (Near Harris St.) qe9Y S' DESPgTIÑ best in service and the best in products...ensuring durability in, what Tel. 2110816 GEORGE you buy and your own guaranteed satisfaction. S7 h R4 1 L WAY SQUARE 211 0191 ?~ / MAIL ORDERS TO RADIO DESPATCH SERVICE Open: Mon -Fri 8.15am to 5.30pm Thursday night late 211 shopping 869 George St., Sydney 2000 Tel. (02) 0191 211 0816 till 8.30pm Sat 8am to 11.45am

MOSFET & HYBRID POWER AMP MODULES MEMBRANE KEYBOARDS (widely used in Videorecorder 8 HIFI systems) HUNDREDS USED IN RECORDING STUDIO & STATION WITH A vailable in 4, 12 16 keys ULTIMATE PERFORMANCE TO MATCH THOSE OF THE DIGITAL & or any combinations with yoúr own Choice of colours (6) and symbols. Each kit contains the keyboard, the lace plate, the overlay, keyboard terminal & an 8 pins connector (fits into DISC PLAYERS. a 16 Pins IC socked SPECIFICATIONS: Cat No. Keys Colour patches 50.80 per pack 16 Freq. Resp. 15-50KHz, -348 S/N ratw 100dB pcs per pack per colour. . 4 SK0011 $4,80 White, Silver, T.N.D.® 1KHz 0.005% (MOO) Slew rate 20V/ps (MOS) SK0021 12 $7.80 Red. Orange, Blue.BlGrue. 0.015% (HYB) 15Vlys HOB) Face & Overlay in - I.D. below the limit of the Damping Factor better than 400, 8R 100Hz SK0031 16 59.20 plate available different combina @ tions the spectrum analyser B&K 2031. Input senah. 500mV/10060 of three kit sets.

No aoiustment required No external components Only 5 wires to connect, The best input, output, common, ± power supply Fully imported with guaranteed transformers available to match the power amp modules III TOROIDAL + I TRANSFORMERS as used In the ELEKTOR kits (see ELEKTOR Sept issue). performance. Standard 240VAC/50Hz primary, dual secondary voltage, 6+6, 9+9. 12+12, 15+15, 18+18, 22+22, POWER 25+25, 30+30, 35+35, 40+40, 45+45, 50+50 & 55+55. Multiply the voltage by the current in rms to OUTPUT HYBRID PRICE MOSFET PRICE lied the power required. 30W/8R ZH1060 539.95 - - Unit Unit 60W/8R ZH1120 S56.95 ZM1128 S 82.95 Cat. No. Power price Cat. No. Power price 120W/8R ZH1248 ZM1248 582-95 5139.95 MTO series 15VA S21 .50 it' , , MT5 series 160VA 546.50 MT1 series 30VA 524.50 i MT6 series 225VA 556.50 MT2 series 50VA 531 .95 ! MT7 series 300VA S66.50 PASSIVE INFRA RED MovEMENT in DETECTORS user) MT3 series 80VA S33.95 `` MT8 series 500VA 590.50 ELEKTOR KII u nome alarm system. America's wen -known MT4 series 120VA S38.50 '+...i1' MT9 series 625VA S110.50 ARROWHEAD brand S8700 series, major price breakthrough due to a buy. requires 10.50to 15V max.w SPST switches for alarmC and output &as0°tamper swOmswitch (relay contact mom. 30Vand DC/100mÁ). WWe angle 90° with tom range. ideal for home and CAR BOOSTER AMP. MODULES ZH 3015 537.50 Protects. 30W14R output. Extremely rugged both mech. and elect., Just con - SUPER SPECIAL cheaper than ' wholesale WAS 5135 nuw only 592.50 each. nect between existing hifi & car spks or from tape olp, req. 8-18V ' dc.

MECHANICAL CONTACT KEYBOARDS (save t7 each!) -FAST SPEED BIFET IC PRE AMP BOWx2DC STEREO AMP KTKT080000 S 40.00 SK1200 12 keys Só.9Ú m. ECHO AREVERB.(BBD) amp KT2400 -- $158.00 PRE-AMP+EOUALISERKT2500 SK1600 16 keys STEREO 5144.20 S7.90 : ...... (details a EA Nov. 1983 P147) -~

MAIL ORDER ADD POST & PACK CHARGES HI-COM UNITRONICS- INTERNATIONAL PTY. LTD. ligunder 25 $2.00 Shop7, 45 nkcn $25 -$ 50 $3.00 President Ave., CARINGBAH NSW 2229 MAIL ORDER: P.O. Box 20, SYLVANIA NSW 2224 welcome here $50 -$100 $4.50 over $100 $6.00 PHONE: (02) 524-7878 WE STOCK ALTRONICS KITS, ETI & EA CIRCUIT BOARDS

ELECTRONICS Australia, January, 1984 127 Versatile mutó-standard modem Continued from page 96 The grommets supplied should be other equipment via the PCB mounted naturally requires full duplex trans- used for the mains and telephone cord line terminal block. The centre OFF mission on the line. entry points. The mains cord must be of position disables the connection logic, With the cooperation of the user at the the three wire type and should be placing the modem permanently off-line. other end of the communications link securely anchored with a cable clamp to The AUTO position puts the modem the correct operation of the modem and the base of the cabinet, and active, under computer control, with a the line can easily be verified. neutral and earth wires connected to the connection made by taking the DTR line terminal block on the PCB. high. For normal operation with a computer which drives the DTR line, the Connection to Operation switch would normally be left in the telephone lines Using the modem is simple, as the AUTO position. Readers are warned that the three front panel controls a.re normally For normal operation the "Test" switch Telecommunications Act 1975 prohibits When the set once and then disregarded. is left in the centre position. the connection of any equipment to the is position The mode switch is a 12 -position rotary switch moved from the centre public telephone lines except for type located on the left of the front the red "TEST" LED will light. Telecom approved devices and panel. Nine positions select the desired Two test positions are available. The equipment leased from Telecom. The operating mode, including the data rate, analog (ANL) test mode connects the modem described here uses a Telecom - answer or originate mode, and CCITT or modem transmitter output directly to approved line isolation transformer and Bell standard. A 10th position provides the receiver input and forces the modem follows relevant design guidelines, for loopback testing of the 75bps back to transmit and receive on the same separating the power and line channel of the CCITT V.23 standard frequencies. It tests the local terminal connections and matching the when used in conjunction with the "Test" and the link to and from the modem, impedance of typical telephone lines. switch. since whatever is typed on the terminal However, it is not a Telecom approved The 11th position allows control of the will be sent directly back via the modem. device. operating mode from an external source The Digital test position can only be Readers wishing to secure Telecom if connections are made via the auxilliary used from the other end of the approval for the unit once built should connector on the PCB. The 12th position transmission line. It connects the contact the Regulatory Branch, Data on the mode switch is not used. recéjved digital data back to the Division, Telecom Australia Head- The "Connect" switch determines transmitter of the modem, which means quarters, 199 William St, Melbourne, for when the modem is connected to the that whatever data is received from the an application form and details of the communications line. In the Manual remote terminal will be transmitted back documents which must be submitted position the modem is permanently immediately. This mode can only be with the application. A fee is payable for connected, with the line looped back to used with the 300bps standards as it type approval testing. Next month in Electronics Australia**

Ignition killer for cars Most car burglar alarms are easily circumvented, but not our cunning "ignition Killer". This sneaky antitheft device uses a 555 timer to place an intermittent short circuit across the points. Until disabled by its hidden switch the circuit effectively makes the car undriveable - a sure deterrent to thieves! .:-. .

[! I #ul1aN)'áá UHF television down -converter )4L13Z ' MI Give your VHF -only television set a new lease of life 2j with our UHF down -converter. This project can be continuously tuned to receive UHF transmissions from rt channels 21 to 63 and provides a converted output on any VHF channel from 0 to 11. PLUS: Cricket stump microphone Get the inside story on how TCN Channel 9 brings you the sounds of the cricket. As our story shows, you couldn't get Telephone bell extender much closer to the action! For the hard of hearing, or simply for those who must new telephone bell Although these articles have been prepared for publication, be out of range of the 'phone, our circumstances may change the final content. However, we will extender provides a hard -to -ignore alert activated by make every attempt to include the articles featured here. the standard ringing tone.

128 ELECTRONICS Australia, January, 1984 Micronews v icroBee software from Tom Moffat Simple terminal for Hobart firm High -Tech Tasmania has released a new 4K MicroBee software telephone data package in EPROM. The 4K package 11 programs was written Interact Technology Pty Ltd has containing by Tom Moffat, an author well known to announced a new low cost computer MicroBee users. access device known as "MIT" (for "Miniature Inquiry Terminal"). The Although any of the programs can be called from BASIC, most the package portable unit is placed over the of has been mouthpiece of a telephone and allows directed at machine code programmers. Included is a debugging the user to communicate with a computer system using touch-tone routine that freezes a program in mid - run and all dialling signals generated from a numeric displays the contents of the keypad. Z -80's registers, and a memory dump At the other end of the telephone line facility that provides a hexadecimal a computer equipped with a voice listing of any memory area, to both the modem and appropriate software can screen and a printer. A program called decode the tones and send pre-recorded "BASCON" provides on -screen voice messages back to the user or ask conversions among the decimal, for information to be entered for hexadecimal, and binary number bases, processing. a task usually done from tables in a The MIT will sell for around $50 1 book. according to the manufacturers, with The largest program in the package, typical applications including credit card occupying just under half the EPROM, is verification, telephone ordering, data products. Directors Don Breen and Peter a disassembler that converts pure collection and access to information Whitelaw aim to fill a growing need in machine code into assembly language services. high technology industries by taking an and can also display ASCII -coded data The MIT is a compact, waterproof unit innovative product from the design stage sections of a program. The disassembler and can operate for up to five years from through to manufacturing and allows a user to study the workings of internal batteries. marketing, on a joint venture'basis. any machine language, program. In Interact Technology Pty Ltd is a market For further information on MIT or the addition the EPROM contains a program development company specialising in' company contact Peter Whitelaw (03) called "SCRDMP" which, when called Australian electronic and computer 299 2099. from within a program, provides an exact copy of the MicroBee's screen to a C-ITOH printer, graphics and all. For those who use the MicroBee's News from the Clubs editor/assembler as a word processor, The Sydney Forth Group meets on of the Osborne computer now that there are some programs to make the the second Friday of each month at Osborne in Australia has ceased task easier. MANU sends control codes 7.00pm in Room LG16, Morven operation, have set up a users' group oto a C-ITOH printer to set it up in Brown Building, University of NSW. in Melbourne. The first meeting was manuscript format with a large left The group has begun publishing a held in December with the support of margin, and double spacing. WORDS newsletter which is included in the Direct Data, one of the distributors of provides a count of the words written price of membership ($20 per year, the Osborne computer in Victoria. into the EDASM's primary file. There's $10 for students). Because of the Direct Data has collected a also a program to initialise the MicroBee diversity of hardware used by considerable amount of public for use with a parallel printer. The members priority has been given to domain software for the Osborne, MicroBee does not do this itself except developing a standard cassette plus spare parts and catalogs. There under BASIC. interface to allow exchange of will be a charge for copying and the Finally, three general use programs programs. A software library is supply of disks to members of the represent a "best of Tom Moffat" available to members. users' group and a fee of $1.00 to collection: The highly popular For further information contact cover the cost of each meeting. radioteletype decoding program, the Peter Treagle, 10 Bina Ave, Yowie For further information contact fascimilie "picture plucker" program, and Bay, 2228, or phone (02) 524 7490. Alison West at Direct Data, PO Box the MicroBee audio frequency counter. A new computer users group has 241, Vic, 3143. (03) 20 6949. The memory for the eleven programs, been formed for users of the Tandy A new group for users of the VZ presented individually, would run to MC -10 and other 6800/03 -based 200 computer has been formed in much more than 4K. The space saving is systems. A special invitation is Victoria. Plans are to publish a achieved by sharing subroutines among extended by the group to users of the newsletter every six weeks and to set several programs. The package is Dream 6800 computer. For details up a software library for the use of available in a type 2532 EPROM for both write to Frank Rees, 27 King St, Boort, members. the standard (2MHz) Microbee, and the Victoria, enclosing a stamped, self- Subscription to the group of $10 per IC model (3.375MHz). The cost, addressed envelope. year and further information is including postage and full instructions, is Some micromputer users in available from Luigi Chiodo, 24 Don $50.00. Inquiries to High -Tech Tasmania, Victoria, concerned with the support St, Reservoir, Vic 3073. 39 Pillinger Drive, Fern Tree, Tasmania 7101. ELECTRONICS Australia, January, 1984 129 the brilliant -200

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TEACH YOUR FAMILYPROGRAMM/N;

find out more! Introduction to Computing Are you a 'babe in the woods' when it comes to computing? Here's a look at this great book written just for you - in language F a, you can understand! Cat B-7200. range. of educational, financial su, e,. ONLY $995 & games software r r!' SPEED READING* VZ-200 Technical Ideal for improving reading and an comprehension skills-written'by . Manual experienced Australian primary school Want to get the most from your VZ-200? This teacher! Cat X-7257. technical manual explains all the ins and outs, TYPING TEACHER ups and downs. For the real computer enthusiast Even if you're a complete newcomer, Exciting or beginner who wants to know more, Cat B-7204. this program will quickly get you familiar New and confident with the keyboard. JUST $950 Cat X-7258. Games ELEMENTARY GEOMETRY* POKER - Not too strong on geometry? This Cat X-7233 First Book of Programs SLOT MACHINE - program should help. It uses a friendly for your VZ-200. explanátion/quiz approach. Cat X-7256. Cat X-7234 Tried, trusted and true programs BLACK JACK' -Cat X-7235 There's something for everyone - and remember, STATISTICS 1 CIRCUS -Cat X-7236 BIORHYTHM- they're all written in BASIC so you can save them A great introduction to the basic Cat X-7237 HORSE RACING*-Cat X-7238 on cassette.. That means you'll only have to key principles of statistical analysis. Tests VZ INVADERS -Cat X-7239 DYNASTY them in once, to use them anytime! Cat B-7202. your knowledge with examples Cat X-7251. DERBY* -Cat X-7240 VZ GHOST HUNT- Cat X-7242 HOPPY-Cat X-7243 SUPER STATISTICS 2* ONLY $695 rollowmg on from Stat. 1, this program ,..and lots more, too! Come views more advanced concepts (eg: the on in- there's Chi square test). Cat X-7252. something for 512501 Joystick MATRIX* EA Working out mathematical matrices can everyone! Just Controllers be a real chore. Use this program to AND INTERFACE! X-7253. help develop your skills Cat Sky-high action & thrills! A pair ofsturdy, super- 50 TENNIS/GOLF LESSON Amazing! Try your hand at Lear Jet (Cat l responsive joysticks that add s39 Challenge your computer to a game of X-7241)...or play Air Traffic a whole new dimension to T It rules, (Cat X-7249. It's games! Cat X-7212. tennis or golf. plays by the so Controller s299EA action you'll learn about the game. Cat X-7254. fast. furious and lots of fun. - DICK SMITH Personal mputer With all the personal computers around these days, you're probably wondering which one is the best value. Before you buy any computer, take a look at three things: its power (or usefulness), its back-up and its price/future. It's the computer for The Dick Smith VZ-200 features an 8K Microsoft BASIC, PLUS an additional 8K today! Don't miss your 'enhancements'. Compare that to the Tandy MC -10! And it has 8K user memory chance - snap one up inbuilt: compare that to the VIC 20! for an The Dick Smith VZ-200 is backed, of course, by the Dick Smith Electronics organisation. Complete technical and service facilities, program development, etc - amazing all guaranteed The Dick Smith VZ-200 sells for only $199 - the first personal colour computer in Australia to sell below $200! There are many other computers now being unloaded around this figure - but be careful! Some companies have already gone broke and others may be drastically reducing prices just to clear dead stock! You could be buying an 'orphan'! Low -Cost Colour Monitor Don't want to tie up the f am ily's colour TV? This high quality, 36cm colour video monitor gives bright, crisp pictures - sound too! Cat X-1 195. 5389

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Want more memory? Just plug this in & you've got it! It couldn't be simpler. Add this module, 16K Memory and expand the VZ-200's RAM memory Module o a generous 24K! Cat X-7205. Use a Centronics PRICE/TECHNOLOGY BREAKTHROUGH! V type printer! Printer Four-colour Printer/Plotter Interface Don't buy just a printer - here's a fantastic NEW 4 -colour Lets your VZ-200 talk to printer that's an X -Y plotter as well! Produce graphs, pie in many almost any Centronics - charts, printing different sizes and colours It's all so type printer. easy to do, using simple commands in your BASIC programs! Top quality! Cat X-7208 Cat X-7210. 1495° DICK SMITH Electronics See page 99 for address details. Information centre

PAINTING TV ANTENNAS: I believe hum field from the computer could be kit building and I intend to get someone painting an antenna with metallic paint, affecting the TV. to connect it to the. TV for me. My as suggested in your article in the Unfortunately there is no easy, safe question is how can sound from the VIC

November issue,. will be disastrous. I way of using the EA Video 'Amplifer be connected to the TV? (B.F., Blayney, painted a yagi with some grey metallic (August, 1983) with a live chassis TV set. NSW.) paint and it has not worked since, as the If there was, we would have included While we haven't tried it, if you are metallic paint is an excellent radio shield. this information in the article. Do not using a television receiver modified for The solution is to use insulating lacquer attempt this connection under any direct video entry, it should be possible which works well. (W.L., Thredbo, NSW.) circumstances, otherwise you could get to inject the audio signal via the VIC-20s Our reaction to your suggestion that a nasty shock. There are several possible RF modulator. The videó from the metallic paint shields an antenna is that it ways in which a video amplifier with a modulator should be swamped by the is erroneous. Possibly your antenna did fully isolated output could be designed 'more direct signal from the video not work after you painted it but the but we have yet to do the necessary amplifier while the modulated audio is paint probably had little to do with it. development work. processed as usual by the television Possibly, the metallic paint shorted out Our advice concerning the video receiver. the dipole connection and thereby enhancer is to forget it. It will not solve In general the audio circuits of rendered the unit ineffective but that is your problem. In short, we have no television receivers are as varied as the really not the fault of the paint. present solution to your problem other video circuits and installation of a direct than to suggest the expensive option of a audio connection is heavily dependent

VIDEO INTERFACE PROBLEMS: I own a video monitor. on the design of the actual receiver in Commodore 64 and a Philips 16CT question. 3010/75 TV and the results are not all I VIDEO AMPLIFIERS: I write regarding the In those sets which use a separate think they should be. My daughter has Video Amplifier for Computers and audio amplifier the best point of the same computer and a National TV VCRs (August 1983). connection would be to the side of the with much superior results. All the Your cover features this unit with a volume control potentiometer which is adjustments possible will not bring mine VIC-20. The only problem being that, by connected to the audio detector. A 25µF up to the same standard. I was, itself, it won't work with the VIC-20 electrolytic capacitor in series with the therefore, very interested in the Video because of the need for a sound new audio input would probably be Amplifier project in the August issue. Is channel. required to avoid upsetting the DC bias there not a way a floating connection My experience in electronics is only in conditions of the audio amplifier section can be made to a live chassis?

Then, in an American magazine, I saw an advert for a video enhancer which Remote Dimmer is untouchable would enable your TV to give far I would appreciate some assistance It seems that the unit is just superior results to a monitor, which with a problem I am having with the oversensitive, but I am at a loss how brings me to my second question. In Touch-lamp Dimmer control (April to control it. During humid weather, it your opinion, would the Video Enhancer 1983). I bought four kits, which all sometimes goes completely berserk, described in the October issue serve any functioned perfectly, until I attached a dimming up-down at will. (P.R., North useful purpose between my computer remote unit to one of them to use as Turramurra, 2074.) and T,Y? a two-way switch. All of a sudden, I The problem of too much If is no in both cases, is the answer had a "non -touch" dimmer, which sensitivity can apply to both the there any other solution? If there is, could be activated by holding my remote control and the Touch-lamp would you consider making a project hand some distance away from the Dimmer itself. It often occurs in out of it? The 64 is, I'm told, both selling touch plate. I have also experienced houses of solid brick construction and well and quite notorious for its fluttering the light turning on and off by itself. in rooms which have metallic graphics. (W.K., Dynnyrne, Tas.) Great fun when this happens at two wallpaper. As we remarked in the The problems you are experiencing o'clock in the morning. April 1983 article, the polycarbonate with your Commodore 64 computer I checked with the kit supplier plate tends to collect a greasy film within probably stem from limitations (Jaycar) who checked over my work which can cause false triggering. the computer's RF modulator. We and said everything looked OK. I then In your case though it seems clear assume that you have tried swapping proceeded to replace all the that the remote control circuit is too have tried modulators and that you components in the remote unit, all to sensitive. This can be easily remedied adjusting the fine tuning on your TV set. no avail. Then completely by mistake, by reducing the value of the 3.3M2 Although we haven't tried it, it may be I discovered that if I removed the resistor at the base of Q1. Try worthwhile experimenting with aluminium touch plate from the face reducing the value to 1.5MO. alternative RF modulators. of the remote, and used the contact Similarly, if the Touch -lamp Dimmer How close together are the computer spring as a touch plate, the whole unit itself is too sensitive, reduce the 1M2 as and the TV set? Try separating them operated perfectly. resistor at pin 5 of the S576A IC. far as possible. It's just possible that the

132 ELECTRONICS Australia, January, 1984 of the set. In many cases, however, the audio section of the set is not independent of Electronics Australia Reader Service other circuit functions. Many modern "Electronics Australia" provides the following Charge $3. We cannot provide lengthy answers, sets, for example, use a combination services: undertake special research, or discuss design changes. Nor can we provide any information on sound IF/detector/volume control and PHOTOSTAT COPIES: $3 per project, $8 or commercial equipment. audio amplifier integrated circuit. In where a project spreads over multiple issues these cases the volume control serves to (price includes postage). Requests can be handl- OTHER QUERIES: Technical queries outside the ed more speedily if projects are positively iden- scope of "Replies by Post" or submitted without vary a DC voltage which is fed into the tified, and if not accompanied by technical fee may be answered in the "Information Centre" internal volume control circuitry of the queries. We reserve the right to supply complete pages, at the discretion of the Editor. back issues instead of photostats, where these IC. Connecting a sound source to the COMPONENTS: We do not sell electronic com- are available. ponents. Prices and specifications should be volume control in this case would be CHASSIS DIAGRAMS: For the few projects sought from advertisers or agents. require a metal useless without additional modifications which custom chassis (as distinct BACK ISSUES: from standard cases) dyeline plans showing Available only until our stocks are exhausted. Within six months to the receiver. dimensions are normally available. $3 including of publication, face value plus '9Oc for Perhaps the postage. post and packing for each simplest solution to the Issue. Seven months and older, $3 (includes post problem would be to couple the audio PC BOARD PATTERNS: High contrast, actual and packing and storage fee). size transparencies: including output a $3, postage. of the computer to separate Please specify positive or negative. REMITTANCES: Must be negotiable in Australia audio amplifier. Indeed the Commodore and made payable to "Electronics Australia". PROJECT QUERIES: Members of our technical Where the exact charge may be in doubt, we 64 user's manual suggests the use of the staff are not normally available to discuss in- recommend submitting an open cheque endorsed home hifi to obtain the best results from dividual projects, either In person at our office, or with a suitable limitation. by telephone. the computer's sound synthesiser. ADDRESS: All requests to the Assistant Editor, REPLIES BY POST: Limited to advice concerning "Electronics Australia", Box 163, Chippendale, Another approach would be to mount projects published within the last three years. 2008. a small amplifier inside the television receiver and connect this to the TV speaker in place of the set's own audio available, or where I could get the different systems of mains fault output. This approach has the advantage circuit. protection. The first is the earth leakage of being independent of the audio It appears the two transformers are circuit breaker which was arranged to circuitry of a particular set. connected in parallel, giving a 120V sense the presence of a small leakage The computer depicted on the cover supply to the turntable and tape cúrrent to earth and thus break the of the August 1983 issue was actually a recorder drive motor. The main circuit. These were to be found on the Commodore 64. transformer has a centre tap primary switchboard of many homes prior to the winding with two secondary outputs; 15 TRANSISTOR ASSISTED IGNITION: I 1960s but they have now lost favour. and 6V, I think. The tape has recently purchased a Transistor Assisted transformer The second and more modern system a and I a Ignition kit from Dick Smith Electronics. 120V think' 6V output. The is the core balance relay. This senses an The unit seems to be working quite well manufacturer's identification numbers imbalance between the active and are as but whenever it is connected the tacho on the transformers follows: neutral currents and by implication, a Main ELT reads about 300-400rpm. Dick Smith's transformer -1106 17-41. fault current to earth. With either of Tape transformer TS1410104/7.0K3T.K. units, if technical department suggested that I these you touch the active wire write to you to try to get some Maybe you have details of compatible you will certainly get a shock but the information on rectifying this problem. transformers or know someone that core balance relay should act fast may. Failing all I may The car is a 1971 4.2 Jaguar. (A.W., else, have to look enough to ensure that the power is Campbelltown, NSW.) at replacing 'the two drive motors. Any removed before the shock becomes details you can give me on the above fatal. The rough diagram included with would be greatly appreciated. (L. Lomax, your letter seems to indicate that the Core balance relays are a very useful 58 O'Reilly Street, Mundingburra, Old.) safety Ideally, tachometer works by monitoring the product. every home Unfortunately, we have no should have one current drain of the ignition coil. Clearly installed on the information on this company which has switchboard. Alternatively, you can there must be more to it than that since been out of business for many years. We protect a whole power by the current drain of the ignition system circuit have published your name and address installing the Clipsal core balance relay actually tends to reduce as the spark rate in one readers dual increases. case of our can help you. cum power point. Supposing that the tachometer itself EARTH LEAKAGE: I first read in a contains circuitry to ignore the DC magazine (not EA)'The Safety Device .. . current and monitor the voltage spikes, is a core balance earth leakage Notes & Errata then it should work equally well with the protection unit. It is intended to detect DUAL TRACE CRO ADAPTER (CDI, Transistor Assisted Ignition, whether or current leakages from the active or November 1983): There is an error in the not it has dwell extension. Your neutral line to the earth line of the house circuit diagram. The 5600 resistor should comment that the tacho reads wiring. If the leakage current is above a go to the base of Q11 and not to the 300-400rpm is also confusing. Does it certain low current (typically from 10 to anode of D3. Also, the base of Q11 and read this all the time, regardless of 20mA) a circuit breaker will trip within the anode of D3 should be linked. engine speed? Can any reader throw the device." Capacitors Cl and C2, referred to in the light on this subject? I always thought that these core text, are the 15pF capacitors in parallel balance earth leakage units worked in a with VR3 and VR4. Finally, Q13 should ADMIRAL SOUND SYSTEM: I have an leakage to earth rather than on a leakage be labelled 2N4035.

Admiral solid state sound system (radio, through the earth wire. Am I wrong? tape recorder and turntable) model Does this mean that if, with one of these TACHO/DWELL METER (July 1983, File number STC 751. Unfortunately the units connected, I touch a hot wire, and 3/TM/18): On the circuit diagram the power transformer and stepdown the appliance is not wired to earth, Ill supply pins for IC2 have been transformer in the tape recorder are get a handful of 240 volts? (J.R., transposed. Pin 4 should be the positive blown. Could you please tell me if there Wahroonga, NSW.) supply and pin 11 ground. The PCB is an Admiral agent where parts are The text you quote is confusing two overlay is correct. ELECTRONICS Australia, January, 1984 133 Our first passenger jet: Australian aviation history will be made when 50 & 25 YEARS AGO the first Boeing 707 jet stratoliner comes into service with Qantas Empire Airways this year. The "Electronics Australia" is one of the longest running technical publications in the Australian version will have a cruising world. We started as "Wireless Weekly" in August 1922 and became "Radio and speed of between 500 and 600mph Hobbles in Australia" in April 1939. The title was changed to "Radio, Television and carry up to 120 passengers in and Hobbies" in February 1955 and finally, to "Electronics Australia" in April perfect comfort. 1965. Below we feature some items from past Issues. Statistics on the aircraft give an appreciation of the staggering engineering problem in bringing it Toe the line or else: On October 26 into physical form. 7, the Nazis arrested Dr Hans Bredow. The overall weight, for example, of ;. Dr Hans Bredow, less than three years the 707 is 110 tons - against 60 tons ago, was one of the most respected for the Super Constellation. Speed is men in Germany; he organised 550mph against 275mph for the German broadcasting in 1923; he was Super Constellation. Total fuel capacity is 14,500 imperial January 1934 a Secretary of State; in 1926 he left the Ministry to become Radio gallons stored in seven huge nylon Commissioner, at the head of all and rubber bladder cells enclosed by From one amateur to another: German broadcasting; he was also the wing structure. A total of 609 Marconi paid a surprise visit to the chairman of the board of the German gallons of water is carried to supply amateur station at the Chicago Fair, Broadcasting Company; he resigned the water injection system which inspected the equipment, and said it his positions in February, 1933, saying provides additional thrust during was a very fine bit of work. "No, no," (but more graciously) that he didn't take -off. says the young man who built it, "it feel inclined to dance to Adolf's tin was built by only an amateur." "Ah," whistle. Now they are charging him says Marconi, "I'm only an amateur with "breaches of trust". US exports atomic power: The first myself." licence for export of a US manufactured power reactor has An honour in advance: Marchese been issued by the Atomic Energy "The more things change ..." Better Marconi, on the occasion of his visit Commission. and brighter programs is the promise to Japan, has been presented with the The licence, dated November 6, of every radio station, for the year Grand Cordon of the Order of the 1958, authorised shipment of the 1934. Rising Sun, by his Majesty, the reactor to Belgium for installation at We have the assurance of Major Emperor. the nuclear development centre at Conder that the national stations will Mol, about 30 miles east of Antwerp. continue the process of bringing to The reactor, fuelled by uranium with perfection "The Balanced Program." a maximum enrichment of 4.43% 2KY will continue "The Popular U-235, will have a thermal power Program." 2UW will uphold "the RADIO output of 43,000 kilowatts and will excellence of their musical produce 11,500 kilowatts of reputation." 2CH will specialise in TELEVISION electricity for feeding into the Belgian AND HOBBIES "easy -listened -to music." 2UE will electrical system through the improve its fine sporting sessions, and January 1959 switching station at the Mol steam so on. plant. revelation that We're still waiting: The r ú í7 both RCA in America and EMI in Cure for loneliness: The influence of England, have perfected methods of Nuclear plane? Aviation Week wireless broadcasting upon residents modulating stereo programs on magazine's report that Russia was of the Pacific Islands is revealed in a standard AM radio stations is of the flying a nuclear -powered plane letter received this week by 4T0 at greatest interest. brought immediate reaction. Townsville. The writer, a storekeeper By using a double-sideband type of The United States had been doing at Milne Bay, Papua, is a man of transmission most difficulties appear development work on an atomic - nearly 70. He says that loneliness to have been solved. There is no powered plane for 13 years. used to be almost an ache, but disturbance to the AM station and its But the rate of progress had been wireless has altered things. 'Take last place in the broadcast band. held back by erratic financing of the project. night as an instance; at 5.59 I switched A receiver which can separate the on the Radiola as usual to check the two sidebands and thus extract the Aviation Week said the Russian clock. From then on until bedtime stereo _effect will obviously be more plane had been flying for about two there was not a moment of dullness. complicated and costly than the months. Contrast that with the time when one normal type, but how much more is It said the plane was 195ft long, had spent 350 evenings a year absolutely not yet clear. The standard receiver a wing span of 78ft, and weighed 150 alone." The writer says that in a few will not know the station is being tons. months he will be retiring. He hopes used for stereo, for it will receive The United States first used a to call at 4T0 to see the "works" of a both sidebands as before. Thus the nuclear reactor to provide heat to broadcasting station. system will be quite compatible. power a jet engine in January 1956.

134 ELECTRONICS Australia, January, 1984 marketplace EA marketplace

ROBOTS: Hitchcock Robotics offers Kit robots DISPLAY ADVERTS IN MARKETPLACE FOR and component parts. Interested? Send SALE are available in sizes from a minimum of have stamped SAE for catalog. Note, we 2cm x 1 col rated at $15 for a col cm. changed our address to PO Box 833, VINTAGE RADIO VALVES: Huge range of CLASSIFIED RATES $3.60 for 40 letters Ringwood, Vic 3134. We would also like to new and many pre-war types trade or part thereof per insertion payable in unused hear from people wishing to contribute or enquiries welcome. Macarthur Radio -TV. advance. Minimum 80 letters. . subscribe to a robotics newsletter. Katoomba, NSW 2780. (047) 82 1722. CLOSING DATE is six weeks prior to the OSCILLOSCOPE: National Portable Vp-5650A on -sale date. Issues are on sale the first Wednesday of each month. SUIT RADIO HAM:' Land with spectacular with dual trace DC-50MHz delayed sweep panoramic views of lower Hastings Valley. as new with all probes, manual, etc, $1000, See Port Macquarie and Wauchope. Beaut. Peter (099) 36 6035. Ninety acres of natural bush at Telegraph WANTED Point. Major towns within easy reach by TRS 80: Colour computer. 32K, extended CIRCUIT DIAGRAM: For an AWA radiola 715c bitumen road. Only $55,000. (065) colour Basic, two Disk Drives, Joysticks. valve radio. Will pay good price. G. Brooker, 85 0402 ah. $1700 ono. Ring Michael on (03) (049) 63 4469. 606 8362 or (03) 842 2004 (ah). EA ELECTRONIC IGNITION: This popular and AMIDON FERROMAGNETIC CORES: Types RAY GILLETT, MELBOURNE: Radiola coils. proven system will help your car stay in tune. to suit all receiver and transmitter Mechanic cannot raise you on number you All components are as specified in the EA applications. For data and price list send and gave us. 64438. Please phone Rogers 15 FEB '83 article, except that automotive A4 size SASE to: RJ & US Imports, P.O. Box Morelia Road, Mosman NSW. (02) push -on terminals are used for improved 157, Mortdale, NSW, 2223. 969 5768. Urgent. reliability of connection to vehicle wiring, $35 inc. Pack and post to Kitronics PO Box 126, Epping 3076 or for fast bankcard READER SERVICE service and enquiries about the hall effect C Radio Pty Ltd modification to replace breaker points phone COMPUTER CLINIC: Repairs and services Tel. (02) 587 3491 small business and personal (03) 435 0865 between 6 and 9pm. computer IS THE ONLY COMPANY systems, disk drives and printers. Bankcard. WHICH MANUFACTURES AND (07) 269 8573. 49 Gawain Rd, Bracken EA YEAR BOOK: No's 20-34 1958/1973. SELLS EVERY PCB & FRONT PANEL Ridge 4017. Complete books 12 mags per book, perfect published in EA and ETI condition. Contact PO Box 232, Hindmarsh 651 Forest Road Bexley 2207 5007. Ph (08) 333 0529. DO YOU WANT TO BE A RADIO AUSTRALIA AMATEUR? RING FOR INSTANT PRICES APPLE II: Franklin, Neosho software, hardware 24 HOUR TURNAROUND SERVICE and accessories at bargain prices. Send $15 The Wireless Institute of Australia, established for over 80 pages of detailed product in 1910 to further the Interests of Amateur information, reviews, programming tips and Radio, conducts a Correspondence Course for the A.O.C.P. and L.A.O.C.P. prices. Nalco Industries P/L, PO Box 285, Examinations conducted by the Department of FUNDAMENTALS Rydalmere 2116. Phone (02) 638 2980. Communications. Throughout the Course, your papers are checked and commented upon to OF VIDEO EDITING SUITE: Ex medical television, lead you to a successful conclusion. SOLID STATE Ivc 871p and Ivc 711p 1 inch videotape For urther information, write to recorders fitted with interface for Ivc ea51 1 inch edit consola, 50 rolls of 1 inch THE COURSE SUPERVISOR Fundamentals of Solid State has been manuals and videotape, operating W.I.A. (N.S.W. DIVISION) reprinted, revised and updated show- accessories. Suitable for serious amateur ing how popular it has been. It pro- video technicians or groups. $3000 or near P.O. BOX 1066 vides a wealth of information on offer. For more information contact ACH (08) PARRAMATTA, N.S.W. 2150. semiconductor theory and operation, 267 4999, ext 339. delving much deeper than very elementary works but without the maths and abstract theory which make many of the more specialised texts Rhythm Generators. . .continued from p101 very heavy going, It begins with feeds its constant output signal to Q9, suitable value components, will be need- atomic theory, diode types, unijunction, field effect and bipolar tran- which is turned off under normal condi- ed for each instrument to be simulated sistors, thryistor devices, device tions. A positive input pulse will allow (bass drum, high conga, low conga, fabrication and microcircuits. A TR4 to conduct according to the claves etc). The values of C3, shown in glossary of terms and an index com- envelope of the input pulse. This results the table may be varied experimentally. plete the book. Fundamentals of Solid in a sound similar to brushes and cym- The output signals are fed to a pre- State has also been widely adopted in bals. In our example we have filtered the amplifier TQ7 and Q8 via trimpots, the colleges as recommended reading - but it's not just for the student, it's for white noise slightly by introducing a latter allowing balancing of the relative anyone who wants to know just a little .001µF capacitor in the output. For fur- volumes of each instrument. bit more about the operation of ther experiments one can try inductors Unlike the rhythm circuits, which can semiconductor devices. or RC networks to obtain the required operate over a fairly wide range of sup- Available from: effects. ply voltage, the instrument simulators "Electronics Australia", 57 Regent St, Q6 and its components form a "ringing are rather more critical. They are best Chippendale. PRICE $3.50 OR by oscillator", the basic frequency of which operated from a fixed supply voltage, mail order from "Electronics is determined by C2 and the 22k such as 9V for battery operation, or 12V Australia", PO Box 163, Chippendale, resistors, according to the C2 values in from a (preferably regulated) power 2008. PRICE $4.40. the table. One such oscillator, with supply.

ELECTRONICS Australia, January, 1984 135 I ADVERTISING II.DEX

EA Magazine Holders ADVERTISER PAGE

Absolute Electronics 17 . n uyrd can ,rrV» Active Electronics 86, 87, 88 91 9 Altronics 65, 66, 67, 68 r 69, 70, 71, 72 f Applied Technology 92, 93 / Audioson International 41 Avtec Electronics 97 '- - AWA 35 BGR Computers 1 10, 1 11 The binders and magazine holders are available Prices including Birkenhead Electronics 51 over the counter from Electronics Australia. 57 postage are: NSW Price: $5.10 David Reid Electronics 49 Regent Sheet. Sydney. - Holders: $5.50 NSW; $5.60 other states: or six for $29.00 binders. $4.50 holders. NSW; $31.50 other states, $A33.00 NZ.' Dick Smith Electronics 10, 11, 36, 37

Mail orders should be sent to Electronics Binders: 57.00 NSW; $8.50 other states: or six for $33.00 52, 53, 60, 61, 98 Australia. PO Box 163. Chippendale. NSW 2008. NSW; $36.00 other states, $A37.00 NZ. 99, 119, 130, 131 Eastern Communications 28 Electronic Agencies 74 Ellistronics 22, 23, 24, 25 EA PC BOARDS AND FRONT PANELS Elmeasco 2 for projects. Many of Some readers have problems obtaining PC boards and front panels Fairchild 120 our advertisers sell these items and their advertisements should be checked in the first instance. Failing that, below is a list of firms which produce or sell PC boards and front Geoff Wood Electronics 47 panels. Hi -Corn Unitronics 127 NSW VIC. WA Jaycar 4, 5, 42, 43, 104 Dick Smith Electronics, Rod Irving Electronics, Altronics, 105, 122, 123 125 York Street, 425 High Street, 105 Stirling Street, Sydney, 2000. Northcote, 3070. Micro 80 125 Perth 6000. Telephone 290 Telephone 489 8131. 3377. Telephone 328 1599. Radió Despatch Service 127 DSE also has branches RCS Radio 135 and resellers throughout 48 A'Beckett Street, Australia. Melbourne 3001. Jemal Próducts, Rod Irving Electronics 20, 82 Telephone 347 7917 5 Forge Street, Jaycar Electronics 347 9251. Kewdale, 6105 114, 115 117 York Street, Telephone (09) 451 8726 Sanyo Australia IFÓ Sydney 2000. Kalextronics, Sheridan Electronics 81 Telephone 29 2098. 101 Burgundy Street, N.Z. Skarbek Trading OBC Marday Services, 115-117 Parramatta Road, Heidelberg 3084. PO Box 19 189, Stotts Correspondence College 109 Concord, 2137. Telephone 743 1011. Avondale, Auckland. Technical Book & Magazine Co 84 Telephone 745 3077. Shop 11, Regional Shopping Centre, Trade TV & Video 63 Radio Despatch Service, Melton 3338. Mini Tech Manufacturing Wayne Green Inc. 113 869 George Street, Telephone 743 1011. Co Ltd, Sydney 2000. PO Box 9194, Wireless Institute of Australia 135 Telephone 211 0816. Sunbury Printed Circuits, Newmarket. RCS Radio Pty Ltd, Lot 14, Factory 3, 651 Forest Road, MacDougal Road, Printed Circuits Limited, Bexley, NSW 2207. Sunbury 3429. PO Box 4248, AN INTRODUCTION TO Telephone: 587 3491 Telephone 744 2714 Christchurch. DIGITAL SUBSCRIPTION SERVICE ELECTRONICS Electronic equipment now plays an important role in almost every field of human endeavour. Subscription Rates And every day, more and more electronic $29.00 per year equipment is "going digital". Even professional ELECTROIIICS engineers and technicians find it hard to keep within Australia pace. In order to understand new ) Australia $31.00 per year developments, you need a good grounding in elsewhere basic digital concepts, and An Introduction to Digital Electronics can give you that grounding. Tens of thousands of people engineers, Make sure you receive every copy of the magazine it from your newsagent or the publisher. - by ordering technicians, students and hobbyists have us- For publisher subscriptions post this with your Australia - coupon, remittance to Electronics Subscription ed the previous editions of this book to find out Dept, John Fairfax & Sons Ltd, GPO Box will with first available 506, Sydney 2001. Subscription start what the digital revolutions is all about. The issue. fourth edition has been updated and expanded, to make it of even greater value.

Name Available from "Electronics Australia", 57 Address Regent St, Chippendale. PRICE $4.50 OR by mail order from "Electronics Australia", PO Box Postcode Enclosed 'is for years 163, Chippendale, 2008. PRICE á5.40. .- - 136 ELECTRONICS Australia, January, 1984 Your guide to Holiday Viewing

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