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Practical-Electronic PRACTICAL Australia $1.28New Zealand $1.30 95IR £t.07 (inc. VAT) FEBRUARY 1982 13-30V Voltage - Coere Fir W8 *netrond,England.=30V- 2A Variable Bench Power Unit. CAR IGNIT Much more than just kits quite simply the best way to make music... Powertran have been designing and manufacturing high -quality electronic kits for more than a decade. Thousands have been purchased and assembled by constructors throughout the UK and world-wide. Many of our regular clients have built the entire range IN QUALITYNCE - several times! A Powertran kit makes an excellent gift for the electronics enthusiast; and VER is a gift that, when constructed, may be given again. ANDEPE(TXITNDESIGN;EARSSUPPLY Our reputation rests on these unshakeable foundations - we use the most imaginative and ingenious designers; we use high grade components subjected to rigid quality control; our kits are complete, even screws and wire are included; we take care with packing and despatch; our instructions are clear and always fully comprehensive ... and if that weren't enough we back it up with our money -back guarantee. Powertran care and your skill gives you that something special. Among the most popular of our kits are the fabulous 'Transcendent' range of synthesisers. Designed by the expert in the field, Tim Orr, and featured in Electronics Today International - those kits represent the zenith in both constructional ingenuity and musical performance. Thanks to our fully illustrated, carefully diagrammed 30 pages plus of constructional notes the 'Transcendent' range is comfortably within the capability of most enthusiasts. A great many 'first time builders' have completed them without difficulty and are justifiably pleased with the results. TRANSCENDENT POLYSYNTH - brilliant design work and high technology components give the home constructor a machine of such versatility and range, equalled only by factory -made units costing thousands of pounds. Despite the advanced electronics the kit is mechanically simple with minimal wiring and ribbon cable connectors. Solid teak cabinet, fully finished metalwork - a 100% complete kit to give totally professional result. Single Voice COMPLETE KIT £275 (+ VAT) Four Voice COMPLETE KIT £395 (+ VAT) Team the Polysynth with the new matching 4 voice expander. COMPLETE KIT £249 ( - VAT) TRANSCENDENT DPX - a versatile 5 octave keyboard. The two audio outputs can be used simultaneously to give harpsichord and piano/honky-tonk or reed and strings/brass both fully polyphonic. To add more excitement there is a chorus/ensemble unit with strong or mild effect switching. The DPX is an advanced design .. yet care, and our superb construction manual, make it a kit for every enthusiast. COMPLETE KIT £295 I- VAT) TRANSCENDENT 2000 - a 3 octave keyboard yet with all the design ingenuity and thorough engineering that makes a superb and versatile machine. Quality teak cabinet and quality components throughout - complete down to the 13 amp plug. Buy it - buildit - then plug-in and play itI A truly professional sound. COMPLETE KIT £159 (+ VAT) 1024 COMPOSER - one of our latest designs. The Composer controls the synth. with a sequence of up to 1024 notes or equal selection of shorter sequences. Mains powered and with trickle -charged battery to preserve pro- gramme after switch -off. COMPLETE KIT £85 VAT) ...write or phone for NEW 40 page '81/82 catalogue - FREEI PRICE STABILITY: Order with confidence.Irrespectiveof any price changes we will honour all prices in this advertisement until March 31st, 1982. if this month's advertisement is mentioned with your order. Errors and VAT irrems rate changes excluded. EXPORT ORDERS: No VAT. Postage charged at actual cost plus £1 handling and documentation. U.K. ORDERS: Subject to 15% surcharge for VAT. No charge is made for carriage, or at current rate if changed. SECURICOR DELIVERY: For this optional service (U.K. mainland only) add £2.50 (VAT inclusive) per kit. FREE ON ORDERS OVER £100. kie SALES COUNTER: If you prefer to collect kit from the factory, %)4Z #ct. call at Sales Counter. Open 9 a.m.-12 noon, 1-4.30 p.m. Monday -Thursday. C*, Oft. C' BARCLAYCARD PORTWAY INDUSTRIAL ESTATE, ANDOVER, HANTS SP10 3WN tv, KUM (0264) 64455. ELECTRONICS VOLUME 18 No. 2 FEBRUARY 1982 CONSTRUCTIONAL PROJECTS MINIATURE SCORPIO CAR IGNITION by Mike Rees 20 Updated and scaled -down version of a popular design BENCH PSU 26 A protected and metered supply giving up to 30V and 2A INFRA -RED REMOTE CONTROL Part 1 by Bart Trepak 32 Ideal for power operated garage doors TV CAMERA Part 2 by Philip Gaffney 42 Video and Logic boards construction PE RANGER BASE STATION Part 2 by Michael Tooley BA and David Whitfield MA. MSc 48 Construction PE ROBOTS Part 4 by Richard Becker, Tim Orr and Richard Monkhouse 52 The processor board, infra -red receivers, solenoid controller and control base p.c.b.s PE BANDBOX Part 4 by Alan Boothman BSc 62 Conclusion of series GENERAL FEATURES SEMICONDUCTOR UPDATE by R. W. Coles 25 Featuring WD2123 OP -27 DIGITAL DESIGN TECHNIQUES Part 7 by Tom Gaskell BA 36 When Analogue meets Digital MICROPROMPT 60 Hardware and software exchange point for PE computer projects NEWS AND COMMENT EDITORIAL 10 NEWS & MARKET PLACE 16 Including Countdown INDUSTRY NOTEBOOK by Nexus 19 What's happening inside industry SPACEWATCH by Frank W. Hyde 41 Progress of the shuttle POINTS ARISING 51 Space Evaders PATENTS REVIEW 66 OUR MARCH ISSUE WILL BE ON SALE FRIDAY, 12th FEBRUARY 1982. (for details of contents see page 31) IPC Magazines Limited 1982. Copyrightinalldrawings, photographs and articles publishedin PRACTICAL ELECTRONICS is fully protected, and reproduction or imitations in whole or part are expressly forbidden. All reasonable precautions are taken by PRACTICAL ELECTRONICS to ensure that the advice and data given to readers are reliable. We cannot, however, guarantee it, and we cannot accept legal responsibility for it. Prices quoted are those current as we go to press. Practical ElectronicsFebruary 1982 1 TRANSISTORS BFX29/84 28TIP30C 582N1131/2 242N5777 45 BC307B 14BFX85/86 28TIP31 A 452N1303/4 652N6027 32 AC107 35BC308B 16BFX87/88 28TIP31C 652N1305/7 602N6109 60 WATFORD ELECTRONICS AC125/6 35BC327/8 15BEY50/51 23TIP32A 482N1308 682N6290 70 AC127/8 308C337/8 15BP/52 23TIP32C 602N1613 302SA715 60 33/35, CARDIFF ROAD, WATFORD, HERTS WD1 8ED, ENGLAND AC141/2 30BC441 34BFY56 32TIP33A 652N16718 1602SC495 70 Tel. Watford 10923140588. Telex: 8956095 WAELEC AC176 28BC461 34BEY64 35TIP33C 782N2160 2952SC496 70 AC187/8 32BC477/8 40 13FY81 120TIP34A 742N2219A 282SC1 09685 ALL DEVICES BRAND NEW. FULL SPEC. AND FULLY GUARANTEED. ORDERS DESPATCHEDACYI 7/1870BC516/7 40BEY90 80TIP34C 882N2220A 262SC1172 125 BY RETURN OF POST. TERMS OF BUSINESS: CASH/CHEQUE/P.O. OR BANKERS DRAFT ACY19/2075BC547/8 14BRY39 40TIP35A 1802N2221A 262SC1 173 125 WITH ORDER. GOVERNMENT AND EDUCATIONAL INSTITUTIONS OFFICIAL ORDERSACY21/2275BC549C 14BSX20 20TIP35C 1852N2222A 2525C1306 150 ACCEPTED (TELEPHONE ORDERS BY ACCESS NOW ACCEPTED Minimum £10.00 please),ACY28 758C556/7 15BSX29 34TIP36A 1702N2369A 182SC1 307 220 TRADE AND EXPORT INQUIRY WELCOME. P & P ADD 60p TO ALL ORDERS UNDER £10.00 AD142 1208C558/9 16BSY95A 25TIP36C 1992N2646 452SC144985 EXCL. VAT. OVERSEAS ORDERS POSTAGE AT COST. ADI49 79BCY70 16BU105 170TIP41A 552N2846 802SC1678 140 VATExport44aor4rd4e4r4si.n:is,V4A4Tf.VAApflige4b144e tao41,J..:W.rostzlirs clincl:(4.,yriliossastated otherwise, all ADI 61/242BCY71/2 20BU108 240T1P4113 602N2904 282SC192350 price AF118 95BD121 95BU109 210TIP42A 602N2905A/6 262SC1 945 225 stock many items.. It pays to visit us. We re situatedahiL Watford FootballAF139 40B0124 115BU205 190TIP428 752N2907A262SC195390 Ground. Nearest Underground./.8r. Rail Station: Watford High Street- Open Monday to Saturday 9AF178 7580131/248BU206 200TIP120 902N2926G102SC1 957 90 a.m.-6 p.m. Ample Free Car Parking spec* evadable. BC107/8 1080133 60BU208 200TIP121 992N3053 262SC1 969 198 BC107B 12BD135 46 E421 250TIP141 1202N3054 582SC202885 POLYESTER CAPACITORS: (Axial Lawn 400V: 1nF, In5, 2n2, 3n3, 4n7, 6n8 11p; 10n, 15n, 18n,BC108 1080136/740M08001 250TIP142 1202N3055 4825C2029 200 22n 12p; 33n. 47n, 68n I6p; 100n, 150n 20p; 220n 30p; 330n 42p; 470n 52p; 680n 60p; 11/F 88p; BC1088 1280138/940MJ2955 90TIP147 1202N34421402SC2078 175 it2p,; 4472 85:.;14,TV9:apIOri: F,121;1:, 11,0p ilpl.p1;01n5F0n, p2;20En124;3231)nna470r3133r0:668(4)i;i n381, po; 1np:042p ; Ip5 BC108C 12BD140 40MJE340 54TIP2955 602N3565 152SC2091 85 0 P. BC109 10BD144 198MJE370 100TIP3055 602N36141992SC231485 BC109B 1280205 POLYESTER RADIAL LEAD CAPACITORS: 250V; 10n, 15n, 22n, 27n Bp; 33n, 47n, 68n, 100n 7p; 110MJE371 100TIS43 322N3615 1992SC2166 185 150n, 220n 10p; 330n, 470n 13p; 680n 19p; 1p 23p; 10 40p; 2p2 48p. BC109C 12BD245 45MJE520 95TIS44/45 452N3663 1525C1679 190 BC117/8 20BD378 70MJE2955 99TIS48 502N3702/3 102SD234 75 ELECTROLYTIC CAPACITORS (Values in 5A. 500V: 10 52p; 47 78p;63V: 047, 10, 15, 2 2, 33, 5C140/4230BD434 55MJE3055 70TIS88A 502N3704/5 102SK45 90 89( 4 7 9p;10p; 15, 22 12p; 33 15p; 47 12p; 100 19p; 1000 70p; 50V:47 12p; 68 20p; 220 BC143 30BD517 75MPF102 66TIS90 302N3706/7 103N128 112 24p; 470 32p; 2200 90p;40V: 4 7, 15, 22, 9p; 330 90p; 4700 120p;25V: 15, 6.8, 10, 22 Sp; 33 BC147/8 9BD695A 99MPF103 36TIS91/93 322N3708/9 103N140 112 9p; 47 Sp; 100 11p; 150 12p; 220330 22p; 470 25p; 680, 1000 34p; 2200 50p; 3300 76p; 4700 BCI47B 10BD696A 99MPF104 36UC734 652N3710 1040097 88 92p; 16V: 40, 47, 100 9p; 125 12p; 220 13p; 470 20p; 680 34p; 1000 27p; 1500 31p; 2200 36p; BC148B 10BDY56 180MPF105 36VK1010 802N3711 1040100 215 3300 74p; 4700 79p. BC148C 10BDY60 160MPF106 40VN1OKM 452N3771 17940101 130 TAG -END TYPE: 70V: 4700 245p;64V: 3300 198p; 2200 139p;50V: 3300 154p; 2200 BC149 96E115 35MPSA05 25VN46AF 782N3772 19540250 85 110p;40V:4700 160p;25V: 10,000320p; 15,000345p. BC149C 128E167 29MPSA06 25VN66AF 862N3773 27040251 97 BC153/4 278E173 27MPSA12 32VN88AF 942N3819 2240311 60 TANTALUM BEAD CAPACITORS: POTENTIOMETERS: Carbon Track, BCI 57/8 108E177 25MPSA55 30ZTX107/8112N3820 4540313 130 35V: 0 ip.
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