Analog Computers

Reference / Paper · 1978

Practical Electronics, October 1978 — Analogue Computer Part 2: Construction Details

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Part 2 of a multi-part constructional series from Practical Electronics (October 1978) covering the build details of a ten-amplifier analogue computer. The article describes the main PCB layout for ten computing elements (summers and integrators using 741 op-amps), two AD533JD four-quadrant multiplier ICs, relay-based mode control (Compute/Hold/Reset), an overload warning circuit with comparators and LEDs, and a 148-socket colour-coded patch panel. A components list and stage-by-stage construction guidance are included, with wiring and testing deferred to the following issue.

Manufacturer
Practical Electronics
System
PE Analogue Computer (homebrew, 10-amplifier design)
Author
P. J. Kronis, B.Sc.
Year
1978
Type
Reference / Paper
Language
English
Learning track
specific applications
Pages
92
  • PE Analogue Computer (homebrew, 10-amplifier design)
  • Practical Electronics
  • analog computer construction
  • op-amp circuits
  • four-quadrant multiplier
  • patch panel

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Practical Electronics, October 1978 — Analogue Computer Part 2: Construction Details

Australia 85c South Africa 80c New Zealand 95c Malaysia 52.25 PRACTICAL 45p OCTOBER 1978 duel F on ics PRACTICAL LE CTRONI in association with Road 8 Beyhem Kent evenoake rt Clicept Electronics $ lila SYSTEM s issue 60p Is to for library to enjoy cartridge assembleall the familyworks TV you andfull colour and White ir all in OK on Black you pounds of easy Teleply praesents A whole now garnes - save - willlong run. the COLOURCART STAR*OFFERS FFIEE cri WITH of a Professional Football, consisting are of 10 gamesa Kit at -All .holes kit! consists snuffed which be on Mains.Adaptor. enjoyable cartridge that cannot etc. this superbly *one Shoot of a bargain assemble to players), Controls(1 & 2 it is consists Hand OFFER how easy We offer ou Joystick Basketball Box surprised ONLY be Hockey, all You'll Moulded 2 players), Our INTRODUCTORY Inject required. (1 Finished Squash equipment Solo Tennis, No Special -drilled pre - * NEVV game will months la and those 3 to you include Every available Out production become under VVar,VVipe of these already Space price Cartridge Submaries,more. The £19 depending many £12 to game. and 04.90 of the from include: Controls Will vary complexity available Hand the NOW and upon £18.90 With basic kit Cartridge Controls Cartridges already 4 games and Hand Additional Controls Cycle -Stunt Battle -- Cartridge Cartridge 2 games Race Road - - Watch - Fully Assembled E.12.90 Add £3.00 this Pagnevv tor month as they each artridges, available. become with printed cmpldeteasy to follovv come casoe an ly instructions Cartridges assemb. Electrical knowledge is not a necessity to assemble this project - just simple soldering. Cheques and Postal Orders to be made payable to TELEPLAY: send your order (No Stamp Needed) to Teleplay, Freepost, Barnet, EN5 2BR or telephone your order quoting your Barclaycard or Access number. Queries and Technical Advice offered either by phone or by calling at our shop. BARCLAYCARD SHOP OPEN -10am to 7pm - Monday to Saturday CLOSE TO NEW BARNET BR STATION - MOORGATE LINE rif 1 AIL winos? Amr. All parts fully guaranteed. EUROPE'S LARGEST STOCKIST OF TV GAME COMPONENTS. 14 Station Road, New Barnet, Herts EN5 1QW Tel: 01-440 7033/01-441 2922 PRACTICAL ELECTRONICS No.14 VOLUME 14 OCTOBER 1978 CONSTRUCTIONAL PROJECTS P.E. V.D.U. SYSTEM -1 by A. A. Berk, B.Sc., Ph.D. Up to date "one chip" memory mapped system 1054 FUEL CONSUMPTION METER By J. McCarthy 1060 An aid to economy, suitable for most cars HIGH PERFORMANCE POWER SUPPLY UNIT by R. Lawrence, B.Sc. Voltage control down to zero, plus current limiting 1070 ANALOGUE COMPUTER -2 by P. J. Kronis, B.Sc. 1074 Construction details TWO RANGE TIMER by J. D. Jardine A portable, inexpensive general purpose unit 1088 GENERAL FEATURES by Toby Bailey and Bob Whitaker Do you understand it? MICROBUS by D.J.D. A bi-monthly focus on micro's for the home constructor IMPEDANCE 1066 1098 INGENUITY UNLIMITED Capacitor Continuity Tester-Synthesiser Repetitive Waveform Generator Simple Fuzz-Accenting Metronome-Stereo Indicator External Input Unit for Synthesisers 1080 NEWS AND COMMENT 1049 EDITORIAL MARKET PLACE 1050 New products SPACEWATCH by Frank W. Hyde Pluto, More from the USSR, Copernicus discovers Black Hole POINTS ARISING Linear Capacitance Meter, Dimwit, Kiln Controller BOOK REVIEWS NEWS BRIEFS Strain Gauge-Big Brother Check-Micro Power Pack-Computers Galore Club Underground Cameras-Steam Advice-Here's To Progress Teletext Course Disc Full of Holes HOW TO USE YOUR FREE STICKIES INDUSTRY NOTEBOOK by Nexus What's happening inside industry PATENTS REVIEW Thought provoking ideas on file at the British Patents Office READOUT 1053 1058 1084 1087 1090 1094 1102 1093 1097 1100 1102 A selection of readers' letters Our November issue will be on sale Friday, 13 October 1978, price 50p (for details of contents see page 1059) c IPC Magazines Limited 1978. Copyright in all drawings, photographs and articles published in 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 Electronics October 1978 1033 Stop wasting time soldering The NEW MW BREADBOARD accepts Transistors, LED's,Diodes, Resistors, Capacitors and all DIL packages with 6 to 40 pins MINI CONSOLES Ideal for small desk control panels and consoles. Moulded in orange, blue, black and grey ABS. Incorporates slots for holding 1.5mm thick pcb's Aluminium panel sits recessed into front of console and held by screws running into integral brass bushes. SC BOXES Easily drilled or punched, orange, blue, black and grey ABS. Incorporate slots for holding 1.5mm thick pcb's. Aluminium panel sits recessed into front of the box and held by screws running into integral brass bushes. MC 161 x 96 x 58mm £2.12 11-91 (Includes VAT) MC 215 x 130 x 75mm £2.94 (1-9) (Includes VAT) (Prices include VAT ,k P.P.) SC 85 x 56 x 35mm 97p (1.9) (Includes VATI SC 111 x 71 x 48mm £1.29 (1-9) (Includes VAT) SC 161 x 96 x 59mm E1.81 (1-9) (Includes VAT) Add 25p per £1 order value for Post & Packing Includes slot -in Component Support Bracket and has 470 individual sockets, plus Vcc and Ground Bus Strips Price £9.72 (includes VAT & P,P.1 ECONOMY QUALITY LED's 50 for only £5 - 100 for only £9 Mixed bags, all sizes, various colours 125 lens 411) 16" 41115 lens Full specification LED's also available Red (specify size) 75p per pack Green, Yellow, Orange (specify size) £1.20 per pack Packs contain 5 LED's, mounting clips and data Green also available as above Red @ 98p each AG AH 19p each 28p each Michael Williams Electronics 47 Vicarage Av. Cheadle Hulme, Cheshire SK8 7400 end 74LS Series TR 7400 7401 Seemet.readily detects concealed ferrous and non-ferrous metals within range of its detector field. Ideal for finding concealed pipes, wires, nails etc. One -handed operation, uses standard PP3 Battery (not supplied). ONLY f3.25 plus p. Et p. 25p. (inc. VAT), full instructions supplied. Send coupon below with your remittance. fort PE3 NAME ADDRESS DIMMER KITS at £2.25 inc. of p. to P POSTCODE BLOCK CAPS PLEASE LL Fotherby,Willis Electronics Ltd. 0.21 0.21 0.21 0.25 0.48 064 1.05 0.21 0.12 0.13 0.13 0.28 0.28 0.14 040 014 013 0.27 0.27 0.13 0.24 0.17 025 025 034 013 0.30 0.24 0.24 0.24 0.13 0.52 045 090 0.21 021 0.26 030 0.34 0.21 0.31 0.21 0.21 0.22 010 0.70 0.13 7453 7454 7455 7460 7470 7472 7473 7474 73074 7475 7476 0.13 0.13 7484 7485 4, 021 010 7451 7482 7483 0.22 0.80 0.80 7481 0.21 0.20 7447A 7448 7449 7450 7480 0.21 025 040 0.94 0.94 0.94 013 0.21 0.21 0.26 0.13 0.24 022 0.21 0.26 0.50 0.36 0.38 ins gm 025 030 031 74713 GLADSTONE TERRACE, STANNINGLEY, LEEDS, LS28 6NE. Telephone Leeds(STD0532)563373 Telex 557111 IGLYNWEL: 1034 0.18 7412 7413 7414 7415 7416 7417 7420 7437 7438 7440 7441 7442 7443 7444 7445 7448 (inc. VAT) full instructions supplied. 021 0.21 0.21 0.21 0.21 0.21 7411 74030 7432 Only f2.00, plus p. Et p. 25p. 74100 0.12 0.12 012 7422 7423 7425 7426 7427 7428 7430 from Britain's largest Dimmer Makers. Complete Kit of Parts for our VCL 500M, 500W Dimmer Switch. 740 7402 7403 7404 1405 7406 7407 7408 74008 7409 7410 7421 UNBEATABLE DIMMER OFFER enclose cheque/P.O. RC 190x 110x6Omm 0.46 0.04 0.75 0.72 01 7 0.90 0.00 0.97 1486 74088 7489 7490 7491 7492 7493 7494 7495 7496 7497 74100 740 74100 028 0.31 1.50 200 0.35 0.05 0115 0.44 0.46 0.82 0.95 Natural Hammertone Diecast Diecast 70p 94p 1.22 1.64 2.53 93p 1.23 1.59 2.11 AS prices include VAT. Add 25p P&P (Extra for overseas). Discounts over E 10 less 5%, over f20 less 10%. over E50 less 15%, over (100 less 20%. Send SAE for complete list of components for 740 74168 74169 14170 74172 74173 14180 2.10 ill 400 I" Oil 2.10 114 113 112 UNEANS CA3045 -14 -14 -14 -14 1.4171011 -14 LAPIIN -14 MC131W -14 11438014 14138114 010 042 14174 74175 OH 740175 325 74178 0.80 74177 OM 74178 120 74179 1.10 74180 040 74181 1.75 74182 0.75 745182 2.30 74H183 019 74184 110 741854 1.20 74186 7.20 74188 2.70 74189 74190 1.05 74191 0.09 74192 0.99 74193 1.06 74194 0.00 74195 014 74196 0.90 14197 DU 74198 1.41 74199 1.41 74221 1.50 74247 74248 74249 74251 1.00 74253 74257 74258 74260 74281 74268 14273 2.15 74279 126 74283 1.71 74284 5.16 74289 74290 74293 135 74298 112 74352 74353 74385 /4388 052 002 OIL SOCKETS 0.80 1.30 74387 0.45 010 010 743613 052 Iii:in 0.10 1.30 0.50 000 012 74388 14390 74393 73670 010 0.54 0.60 2.00 1.06 1.30 014 74104 74105 74107 74109 74110 0.48 0.40 0.28 0.45 0.46 74111 070 14112 74113 74114 74116 74118 74119 74120 74121 74122 74123 74124 74125 74126 74128 74132 74134 74135 74136 74137 74138 74139 74141 74142 74143 74144 74145 74141 74148 74150 74151 74153 74154 74155 74158 74157 74158 74159 74160 74181 74182 74163 74184 74185 74186 74187 68p 79p 88p 1.03 1.77 3.08 Polystyrene version in grey only, no slots, no integral brass bushes RC(P) 112 x 61 x 31mm 61p All prices are 1-9 off, include VAT, but please add 25p per £1 order value for Post & Packing 92 GODSTONE ROAD WHYTELEAFE SURREY CR3 OEB THE FAMOUS POCKETSIZE METAL DETECTOR I RC 150 x 80 x 50mm AST RA -p AK SEEMET I RC 100x62x25mm RC 112x62x31mm RC 120x65x40mm P.P. Note Unless included in price add 25p Post & Packing for orders totalling under £10. All prices include VAT and are valid in UK only for 2 months from journal issue date AT LAST! Uf(l'envi p. ABS Quantity quotations on request 1/4 at f3.50 into integral brass bushes. Green and Yellow @ £1.35 each. Data supplied with full spec. displays only. I I 1.5mm pcb slots and close fitting flanged lids. ABS in orange, blue, black or grey colours. Diecast in natural or grey hammertone colour. Lid held by screws running Common Anode -0.3',-Left Decimal Full specification displays tl 1 Ideal for drilling pcb, chassis etc as well as model making. Supplied with 2 collets that accept tools and drills with 3/32" and 0.50" dia shanks. £7.56 (Includes VAT & P.P.) : RC BOXES ABS and DIECAST Economy quality Red, yellow and green Only 45p each 12 VOLTS MINI HAND DRILL Please supply SEEMET KITS E9.72 (includes VAT & P.P.) Accessory tools... 5 Burrs, 1mm, 2mm, 1/8th Drills, 3/32" Collet Price £1.75 (Includes VAT & P.P.) 20p each SEVEN SEGMENT DISPLAYS 150mm wire leads AA Ideal for drilling pcb's, chassis etc as well as model making. Supplied with 3 collets that accept tools and drills with 1mm, 2mm and 1/8" dia shanks. Red, Amber, Clear, Opal TYPE A NEON INDICATORS Supplied with resistor for 240 Volts operation Held in 8mm hole by plastic bezel Red, Amber, Clear, Opal 240 VOLTS MINI HAND DRILLS TYPE MP NEON INDICATOR Supplied with resistor for 24.0 Volts operation 150mm leads, held in 6.4mm hole by nut 0.40 0.40 0.40 030 0.40 0.40 110 082 1.26 0.82 0.25 0.40 0.50 0.40 0.45 0.51 1.25 0.48 0.41 002 On 0112 0.31 Oil 055 0.40 0.04 0.12 04 2 0.61 2.00 200 200 064 120 120 1.15 099 010 0.40 100 083 0.63 0.83 051 110 Ole 0.80 0.90 2.70 0.90 0.56 122 0.91 0.90 1.20 1.12 -8 NE555N -14 NE25016 -14 NE5580 0117270214 007130030 1.40 1.15 "5 1.06 010 0.55 CH OM ,115., -2 1.15 028 325 013 108 055 1.116 312 015 100 1.40 1.00 1.05 1112 2.00 2.30 0.32 0.32 1.50 0.30 0.65 310 007803311 115 7065508 8.36 741613111 1.40 0.F4 118 035 713413414 200 812 121 1.15 1.35 1.35 50760130 00700230 17141200 3.50 0.10 0.96 1.40 1.50 0.71 0.50 0.10 50751100 338 0.45CA3046 TBA800 11.4810S TC427050 1.04 TC142020 210 324 28414 1.80 op Amps 03130 -T099 1.04 1313014 1313014 L54348N -T099 0.41 -8 039 -14 1.00 -8 0.40 -14 0.42 LM709 LM709 LM709 1099 5.511 -8 0.22 1.51741 114741 -14 520 04741 -T099 5.45 1.14747 1.14390011 -14 0.75 MC1458P -8 042 0.65 VOLTAGE AEGULATOGS 114300 1.143098 134723 7805 7812 7015 7824 7905 7912 7915 16 pn 18 Mn 20 pn 22 pn 24 en 28 pn 40 On Practical Electronics -7099 1.08 -T03 1.31 -14 4.44 70220 015 10220 0.115 10220 0.55 70220 IUD 70220 1.10 10220 1.11 10220 HI 0.11 1.12 0.13 523 527 025 S30 0.44 8.55 October 1978 NOT EVERY CABLE HAS A LABEL Everyone who works with electricity needs to know at some time or other what's going on inside the cable he's handling. What voltage. What current. What resistance. Not knowing the answers, or worse still having inaccurate answers, can make life difficult, even terminal. Eagle Test Equipment gives the right answers The range covers general multimeters, high voltage probes, clamp meters, insulation testers. Here are just four. Send the coupon for details of all the rest. KEW 7 Multimeter EM 1200 Multimeter K1400 Multimeter 1000 OPV. DC volts up to 1000, DC amps up to 100 mA. AC volts up to 1000. Resistance up to 150 Kohms. Pocket size. 100,000 OPV. Taut band 20,000 OPV. DC and A.: volts up to 5000. DC and AC amps up to 10. Resistance up to 20 EM10, 20 & 30 Multimeters 10,20 & 30,000 OPV. All with antiparallax mirror scale. DC volts to 100011200 for EM30). DC amps to 250 mA (600 for megohms. "Off" damping. EM301. AC volts to 1000 (1200 for EM30). Overload protection. R.R.P. Resistance up to 6,5 and 60 megohms respectively. R.R.P.'s EM10 £12.40 EM20 "Off" damping. Complete with leads & battery. R.R.P. £6.95 ex. VAT. movement. Overload protection. Reversible DC polarity. AC amps: 15, AC volts to 1500. DC amps up to 15, DC volts to 1500. Resistance up to 200 megohms. R.R.P. £49.95 £68.00 ex. VAT. f16.40 EM30 £18.95 ex. VAT. ex. VAT. Test Equipment: EAGLE oT Please send me details of your complete range of Test Equipment. Company Name Address Precision Centre, Heather Park Drive, EAGLE INTERNATIONAL Wembley, Middlesex HAO 1SU. PE1 dam Practical Electronics October 1978 1035 Yoail learn a lot from Heathkit electronics courses. Heathkit electronics courses are a most effective way to learnwith fast, reassuring results. Each course is a complete self -instructional package with clear, concise instructions in everyday language. You follow at your own pace, using modern teaching aids and expert guidance. Four basic courses to start with. vv SPECIAL OFFER 10, oh selected courses 1978 until 15th October DC electronics, AC electronics, semi -conductors and electronic circuits. These courses give you a thorough and practical understanding-the key to all knowledge in the field of electronics. Microprocessors and digital techniques. The advanced Heathkit courses take you on to higher levels of computer technology and advanced circuit design, using the same easy -to -follow learning system. Experimenter -Trainers. With the benefit of increased practical guidance, these optional aids win help you through the courses with exceptional speed. The finest way to learn. aloripasicas Heathkit courses are used by home students, industrial concerns, technical colleges and schools. They're acknowledged as the finest way to learn. And the range of courses is complete from the earliest stages to the most advanced steps in specialist fields. To Heath (Gloucester) Ltd., Dept:11On, Bristol Road, Gloucester, GL2 6EET1 Send for the Heathkit Catalogue now. Please tick the literature you want and enclose the appropriate amount in As well as electronics courses, the Heathkit catalogue contains scores of postage stamps. electronics kits which you can build yourself. Burglar alarms, radios, Heathkit Catalogue only (enclose 20p). digital docks, car tune-up systems, test instruments, metal locators... I 16 page Computer Brochure only (enclose 20p). and an exciting new range of personal computers! Forty pages packed with exciting kits you'll be proud to make. I Name IAddress When you receive your catalogue you twill get details of this free offer worth appmximately .11=11.1 Schlumberger ucro Registered in England, number 606177 There are Heathkit Electronics Centres at 233 Tottenham Court Road, London (01-636 7349) and at Bristol Road, Gloucester (Gloucester 29451). I Put a Clamp on those small jobs with NO DEX quick -grip vice Adaptable on all drill supports. V -notch allows fixing of all profiles. Our new 1978 catalogue lists a card frame system that's ideal for all your module projects - they used it in the ETI System 68 Computer. And we've got circuit boards, accessories, cases and boxes - everything you need to give your equipment the quality you demand. Send 25p to cover post and packing, and the catalogue's yours. VERO ELECTRONICS LTD. RETAIL DEPT. Industrial Estate, Chandlers Ford, Hants. SO5 3ZR Telephone Chandlers Ford (0421512956 Dimensions Overall length Overall width Overall height 150mm 130mm 50mm Jaw opening 70mm Jaw height 35mm Jaw width 70mm Weight 850 grammes locking or loosening for use as a vice or as a press. Usable horizontally or vertically on the bench top or on the bench edge. Descriptive leaflet and general catalogue available from SPECIAL PRODUCTS DISTRIBUTORS LTD. 81 PICCADILLY, LONDON W1V OHL Tel: 01-629 9556 1036 The patented locking system of the Nodex vice allows for instantaneous Cables: Speciprod London W1 Practical Electronics October 1978 TTL 74* 13 13 14 14 14 18 38 38 17 17 15 20 17 30 7400 35 CARDIFF RCAD, WATFORD, HERTS., ENGLAND MAIL ORDER, CALLERS WELCOME. Tel. Watford 40588/9 ALL DEVICES BRAND NEW, FULL SPEC. AND FULLY GUARANTEED. ORDERS DESPATCHED BY RETURN OF POST. TERMS OF BUSINESS: CASH/CHEQUE/ P.0. OR BANKERS DRAFT WITH ORDER. GOVERNMENT AND EDUCATIONAL INSTITUTIONS' OFFICIAL ORDERS ACCEPTED. TRADE AND EXPORT INQUIRY WELCOME. P&P ADD 30p. TO ALL ORDERS UNDER £10.00. OVERSEAS ORDERS POSTAGE AT COST. AIR/SURFACE. MINIMUM ORDER £2.00 PLEASE. VAT E portE,orders no VAT, Applicable to U.K. Customers only Unless stated otherwise, ell prices excluseve of VAT. Neese add 8% to devices marked To the rest add 124% We stock many more items. It pays to visit us. We are situated behind Watford Football Ground. N aaaaa t Underground/BR Station: Watford High Street. Open Monday to Saturday 9.00 am - 6.00 pm. Ample Free Car Parking space available. POLYESTER CAPACITORS: Axial lead type (Values are in pF) 400V: 0.001. 00015. 00022.0.0033 8p; 0.0047. 0.0068. 0.01. 0.015, 0.018 9p; 0022. 0 033 10p; 0 047. 0 068 14p; 0.10 16p; 0.15. 0.22 22p; 0.33. 0.47 39p; 0.68 45p. 160V- 0 039 0 15. 0.22 13p; 0.33. 0.47 22p; as& 1 o 29p; 1.5 33p; 2.2 38p; 4 7 47p. DUBILIER: 1000V: 0.01, 0.015 20p; 0.022 22p; 0.047 26p; 0.1 38p; 0.47 43p. POLYESTER RADIAL LEAD (Values in 0/ 250V: 0 01, 0-015; 0-022. 0-027 5p: 0-033.0-047. 0-068.0-1 7P; 0-15 12p; 0-22, 0-33 14p: 0.47 16p, 0-68 20p; 1-024p; 1-5 27p; 2-2 31p. FEED THROUGH CAPACITORS 10001350V Sp ELECTROLYTIC CAPACITORS: Axial lead type (Values are in uFl 500V: 10 409; 47 68p; 9p; 47. 32, 50 12p; 250V: 100 65p, 63V 63, 100 27p; 50V: 1.0 7p 50. 100. 220 25p; 470 50p; 1000, 2200 68p; 40V: 22, 33 9p; 100 129; 3300 62p; 4700 (14g; 35V: 10. 33 7p; 330, 470 32p; 1000 49p; 25V: 10, 22, 47 6P; 80 100, 160 8p; 220, 250 1 p; 470, 640 25p; 1000 27p; 1500 30p; 2200 41p; 3300 52p; 4700 54p; 16V: 10 40. 47, 68 7p; 100, 125 8p; 330, 470 16p; 1000, 1500 20p; 2200 34p; 10V:4. 100 6p; 640 10p; 1000 14p. TAG -END TYPE: 70V: 2000 98p; 4700 121p; 50V: 3000 75p; 40V: 4000 70p; 2500 65p; 25V- 4700 48p; 2000 37p; 40V: 2000 + 2000 95p; 326V: 200 + 100+ 50 + 100 19 0p. 2.2,4.7, 7401 7402 7403 7404 7405 7406 7407 7408 7409 7410 7411 7412 7413 7414 7416 7417 7420 51 30 30 18 29 24 27 27 36 27 35 7421 7422 7423 7425 7426 7427 7 7430 7432 7433 7437 7438 7440 17 25 40 30 33 17 7441 7442 74 68 7443 7444 7445 7446 7447 7448 7450 115 112 7494 7495 7496 7497 78 65 57 189 74105 74107 74109 74110 74111 74112 62 29 74100 119 64 54 68 88 74116 198 74118 83 74119 119 74120 115 74121 74122 74123 74125 74126 74128 74132 74136 74141 25 46 48 38 57 74 73 73 56 74145 85 74150 99 64 64 96 53 80 87 74142 269 74143 314 74144 314 74147 175 74148 109 74151 74153 74154 74155 74156 74157 74194 105 4056 134 74195 74196 74197 4059 4060 480 4062 4063 4068 4067 4068 999 110 68 380 95 99 85 74198 150 75150 110 75491 75492 75 80 CMOS* 15 4000 4002 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 17 105 18 87 50 50 18 18 42 86 89 45 89 89 48 99 91 88 20 66 19 180 45 4057 2570 99 4061 2380 22 4069BE 20 4070 ' 32 4071 4072 4073 4075 4076 4077 4078 4081 4082 4085 4086 4089 4093 4094 4095 4096 4097 4098 4099 4160 4161 4162 4163 4174 4175 4194 4408 4409 4410 21 21 21 23 85 40 21 20 21 74 73 150 85 190 105 105 372 110 145 109 109 109 109 110 99 108 720 720 720 102 4526 59 4527 108 4528 268 4529 199 4530 199 152 99 165 85 75, MC1304P 260 200 4518 265 4519 299 4520 125 4521 4513 4514 4515 4518 4517 382 4522 LINEAR IC'S 702 709C 14 nin 710* 723* 733* 741C* 8 pin 747C* 7480k 753 810 8038CC* AY -1-0212 AY -1-1313 AY -1-5051 Ay -1-6721/6 MC1310 MC1312P MC1496 195 MM2102-2* 190 MC1488* MC1489* MC1495* MC3401 MC3340P* MC3360P 370 MFC400013 580 MFC6040* 660 M K50398* 145 M K50362* AY -3-8500* 385 MM2112* AY -3-8710* 750 NE518A* Ay -5-1224A* 260 NE555* AY -5-1230* 450 NE556D8* 82 NE560* CA3O11* 170 NE561* CA3020 170 NE562* CA3023 80 NE565A* CA3028A* 223 NE566* CA3035 190 CA3043 CA3046 CA3048 CA3075 175 35 48 45 125 22 70 36 150 159 195 92 99 99 395 69 150 89 85 97 635 650 310 210 29 60 325 410 410 185 180 157 NE567* 450 NE571* 200 RAM2102-2* 210 120 175 RC4136D* 80 R0M2513* 700 71 CA3080E* 295 SG3402 211 SN76003N 140 SN76013N 140 SN76023N 205 4031 74161 211 85 SN76033N CA3130* 100 4032 74162 215 92 SN76115N 145 4411 995 CA3140* 4033 17 74163 115 950 SN76227 441201650 ICL7106E* 17 74164 105 4034 196 7451 228 111 4412E1380 ICM7205* 1150 TAA621AX I 17 74165 108 4035 7453 155 TAA661A 452 4036 325 4415F 795 LD130* OPTO 17 74166 161 7454 TANTALUM BEAD C4PACITORS POTENTIOMETERS (AB or EGENI TAA700 353 100 4415V 795 LM3001H ELECTRONICS* 4037 17 74167 7460 20 170 Carbon Track. Log & 31N Lyles, values 022 047 0.68 35V' 010 033 TAA960 300 108 4419 280 4038 LEDs plus clip 28 74170 230 7470 30 27p LM301A 22N0 33 47 68 25V: I5 10 5000. 1K & 2K Ilin onlyl. Single 70 13 25 74172 625 4039 320 4422 545 LM308 7472 110 TBAI20S 27p TIL209 Red 20V: 1.5 16V: 1010 13p each 5K 0-2M0 single gang 220 105 4433 1225 LM318 18 32 74173 170 4040 7473 195 TBA5400 60p TIL211 Gm 47,100 40p. 101/: 229F, 33, 47 6V: 51,0-2M0 Single gang DIP :witch 330 TBA5500 80 4435 825 LM324* TIL212 Yellow 22 4041 27 74174 87 7474 SK 0 2M0 dual gang steeeo 70p 79 47.68, 100, 3V: 68, 100pF. 20p each 75 4440 1275 LM339* 2" Red 17 38 74175 87 4042 7475 80 TBA6411011 250 180 94 4450 295 LM348* 2" Yellow Green2l 36 74176 75 4043 MYLAR FILM CAPACITORS ,7476 120 TBA651 TBA800 90 88 4451 295 LM379* 2 Spare Clips 100V:0001 0002 0005 0010 5p SLIDER POTENTIOMETERS 78 4044 7480 48 74177 105 145 4490F 895 LM380 LS400 299 ,1 015 002 0 00 005 0 0560 7p 0 25W log and lenear values 60mm 86 74178 102 4045 7481 395 TBA81OS 713p 70 TBA820 T1L307 , eF 015 02 9p 50V: 047, 11p SKI) 500K0 single gang 675 69 74180 85 4046 128 4490V 525 LM381 7482 145 80p ORP12 595 1060-500K)) dual gang 87 4501 17 LM381AN 68 72 74181 185 4047 7483 241 TDA1022* 320 209 CERAMIC CAPACITORS: 50V Sell Stock Graduaied Bezels 58 4502 120 LM382 2N5777 54 95 74182 180 4048 7484 125 TDA2020 60 3p each O SoF to I Orli 48 4503 89 LM 1458* 7 Sag Displays 106 74184 135 4049 7485 50 TL071CP* 52 'SnF 220 33nF 47nF 4p each 48 4506 51 LM 3900* TI L312 C An 3" 105 31 74185 135 4050 60 TL081CP* 7486 PRESET POTENTIOMETERS 96 Bp 72 4507 55 LM3909N* TIL313 C Cth 3"105 70 TL082CP* 7489 210 74188 275 4051 Venocal & Horizonlal 130 TL084CP* 72 4508 298 LM391 * TIL321 C An 5"115 33 74190 115 4052 125 7490 5M() Miniature 0 I W 500 8P POLYSTYRENE CAPACITORS 198 UAAI 70 72 4510 99 4053 TIL322 C Cth 5"115 75 74191 105 7491 10p 750 0-25W 10003.3M0 Mow M252AA* 1000 to InF tip. 1 50 to 47n1 104. 105 150 M253AA* 01704 C Cth .3" 99 38 74192 105 4054 110 4511 10p 7492 795 ZN414 0 25W 2000- -4-7M0 Von 130 98 MC1314 DL707 CA. .3" 99 32 74193 105 4055 128 4512 7493 88 ZN424 SILVER MICA Wakes* en pFI 3.3, 0-7 140 68 10 12 18 22 33 47 50 68 75 RESISTORS - Eno make 5% Carbon FND357 2N3442* 131 24 30 Z1X304 99 BF184* 0C36* 165 9p each MAN3640 02 85. 100. 120.150.220 Stability noese TRANSISTORS 20 High Low 2N3563 Meneature 17 48 ZTX311 BF194 10 0C41* LCD 33 digit 975 .' 50 300 330 360 390 600 820169 each 24 2N36I 4* 169 17 8E195 35 BC170 10 0C42* AC117* 32 ZTX314 100 VAL 1 99 RANGE 2N3615* 135 204 each 1000. 1500. 2000 2200 ZTX326 40 11 19 8C171 BF196 10 AC125* 55 0C43* 1p E20 1.Sp ieN 220,4 7M 24 ZTX341 20 2N3663 10 BF197 10 .0C44* 19 BC172 AC126* 31 1.8p SWITCHES* E 12 2p ON 2.20,4 751 CERAMIC TRIMMER CAPACITORS 2A 250V 10 13 2N3702 18 BC177* 15 8F198 18 AC127* 20 ZTX500 4p TOGGLE 1W2 -2010M 20p 700 4 15pF 6 250 8 30pF 28p 11 SPST 14 2N3703 18 BC178* 14 8F200* 28 ZTX501 AC128* 28 0C46* Bp 2% Metal Fein, 100.1 M0 4P DPDT 38p 10 19 2N3704 AC141* 24 BCI 79* 14 8F224A 18 0070* 19 ZTX502 MINIATURE TYPE TRIMMERS 1% Metal Film 50-1M. too OP 4 pole on/off 54p 11 2N3705 16 AC141K* 38 8C182 9 8F244 24 ZTX503 0071* 25 5 6pF 3 10pF 10 40pF 22p too gir.re ace phes Ice Resistors each type SUB -MIN TOGGLE 10 10 8F256* 25 2N3706 AC142* 24 50 0072* 30 ZTX504 25pF S 45p0 600 88pF 30p not rneeeed e.aeues SP changeover 59p 10 BC183BC182L BF257* 28 0076* ZTX531 25 2N3707 36 SPST on/off 54p 10 10 8F258* 26 0077* 25 2N3708 AC176* 18 BC183L 76 ZTX550 PE DIGITAL THERMOMETER COMPRESSION TRIMMERS DPDT 6 tags 70p 2N3709 10 68 20 BC184 9 8E259* 30 2N526* 76 0079* i 400 tO 800 25 190pF 25p All parts available. DPDT Centre off 79p AC187* 2N3710 16 20 BC 184L 10 BF394 22 0081* AC188* 28 2N696* 35 1,0 5000 1250pF 38p DPDT Biased 115* Send SAE for list. 10 35 BC186 21 BF594 40 0082* ACY17 45 2N697* 21 2N3711 SLIDE 250V: 2N3715* 250 28 40 BC187* BF595 38 2N698* 39 ACY18* 48 0083* 1A DPDT 14p SOCKETS JACK PLUGS ACY19* 9 40 BC2I2 44 2N699* 39 2N3772*170 0084* 1A DP clover 15p 10 BFR40 40 BC212L 25 0C122* ACY20* Plastic open moulded in line 48 2N706A* 19 2N3773*288 Screened }A DPDT 13p 22 35 BC213 ACY21 9 BFR79 28 0C123* body metal with chrome couplers 48 2N707* 50 2N3819 4 pole clover 24p 32 11 40 BC213L BFR80 28 0C139* 19 2N3820 ACY22* 85 2N708* 8p Bp break PUSH BUTTON 12p 2-5mm 9 40 BC214 ACY28* BFX29* 26 Spring loaded 0C140* 86 2N914* 32 2N3823* 65 contacts 12ipt 15p 10p 3 5mm 2N3824* 7C 10 BFX81* 130 00141* 85 2N916* 27 78 BC214L ACY39 SPST on/off 200 18p MONO 23p 15 18ip 48 BC307B 14 BFX84* 24 0C170* 40 2N918* 30 2N3866* 90 850 SPOT cover 24p 22p 31p 18pp 15p STEREO 85p ACY40* 16 2N3903 13 51 ACY44 39 BC308 BFX85* 24 0C171* 40 2N920* DPDT 6 Tag 18 AD140* 69 BC328 13 BFX86* 28 OC201* 18 2N3904 75 2N930* 2N3905 18 * Miniature Non -Locking 12 61 AD149* 90 BC338 BFX87* 23 0C202* 85 2N961* InLino PLUGS SOCKETS DIN 2N3906 17 42 BC441* 30 BFX88* 24 0C203* 85 2N1131* 22 Push to Break 25p 'AD161* Push to Make 15p . Fe5 Lou0speatte, A0162* 42 BC461* 30 BFY18* 50 0C204* 85 2N1132* 22 2N4037* 52 ROCKER (whitel 10A 250V 204 3 4 5 Pen And. 13p SP 17 25 5C477* 18 EIFY50* 20 TIP29 43 2N1302* 35 2N4058 30p ,AF114* SP changeover centre off 17 11 BFY51* 25 BC547 AFF1 20 TIP29A 23p 44 2N1303* 50 2N4061 ROCKER: (black) on/off 10A 250V 14p 14p Imp CO -AXIAL ITV) 11 25 BC548 3FY52* 20 TIP29C ROCKER: Illuminated lwhitel 80 2N1304* 50 2N4064* 120 AF117* 25 BC549 11 BFY71* 20 TIP30 52p 47 2N1305* 28 2N4236* 145 lap Lights when on: 3A 240V R10050 Sp 4inglei 20 13 55 BC557 ROTARY: ADJUSTABLE STOP) 1 pole/2-12 AF118* 47 2N1306* 35 2N4289 TIP30A Bp double essone0 colours SP 65 41p AF121* 12 BSX20* 18 TIP3OB 48 BC558 way 2p/2 -6W 3p/2 -4W 4p/2 -3W 64 2N1307* 60 2N4859 12p 10p 3-rney Metal Screened 42 45p AF124* ROTARY: Mains 250V AC. 4 Amp 55 BCY30* 57 BSY65* 30 TIP30C 65 2N1308* 48 2N5135 42 36 BCY34* 75 BSY95* 26 TIP31* AF125* 40 2N1613* 23 2N5136 10p 12p BANANA 4rnm 20 2N5138 2N1671*190 40 BSY95A* 25 35 BCY39* AF127* 40 TIP31A* 2mm 10p 104 DIL SOCKETS *(Low Profile - Texas) 35 BCY40* 78 BU105 130 TIP31B* 40 2N1671B*195 2N5179* 60 1mm 8 pin 10p; 14 pin 12p; 16 pin 139; 18 pin 20p; AF139* Be 2N5180* 60 76 BU205* 190 TIP31C* 66 2N1893* 28 70 BCY43 AF178* 20 pin 27p; 24 pin 30p; 28 pin 42p; 40 pin 55p. 9p 9p WANDER 3nee, AF180* 70 BCY58* 22 8U208* 225 TIP32* 45 2N1986* 60 2N5191* 65 85 TIP32A* 49 2N2160* 105 2N5305* 24 AF186* 50 BCY59* 22 E5567 32 AF239* 42 BCY70* 16 MD8001*158 TIP32B* 70 2N2217* 48 2N5457 32 ASY26* 40 BCY7 I* 15 ME4102 10 TIP32C* 70 2N2218A*31 2N5458 32 16 ME6002 14 TIP33* ASY27* 451 BCY72* 80 2N2219A*22 2N5459 Announcing DM900 - The Digital Multimeter 2N5485 32 2N2220A*26 9 BCY78* MJ400* 90 20 BC107* TIP33A*r 80 with a difference - It measures Capacitance too. 2N5777* 54 BC1078* 10 BD115* 62 MJ491* 160 TIP33B* 100 2N2221* 23 2N6027 las published in E.T.I. August 1978) 9 BD121* 95 MJ2955*120 TIP33C* 105 2N2222* 20 40311* 40 BC108* 50 45 9C1088* 12 BD123* 98 MJE340* 45 TIP34* 85 2N2297 Throw away your analogue meters, here's digital MJE370* 55 TIP34A* 85 2N2303* 46 40313* 125 8C110098i* 129 B,DD112341** 11539 13C accuracy at only half the price of an equivalent 85 94 94 82 56 74159 210 74160 82 92 92 92 4030 81 99 50 CA3081 CA3089E CA3090AQ CA3123E 190 210 390 200 1 AC142K* 389 85pSWITCHES *11165* DIGITAL MULTIMETER VDU CHIP and MODULE commercial Multimeter. The DM900 is a 31 digit multimeter with an Convert your TV into a VDU by using the new Thomson-CSF, 0.5in L.C.D. display incorporating: TV -CRT controller chip SF.F 5 AC & DC Voltage ranges; 6 Resistance ranges. 5 AC & DC Current ranges; 4 Capacitance ranges. The prototype accuracy is better than 1%. This is a unique design using the latest MOS ICs and due to the minimal current drain, is powered by only one PP3 battery. There is also a battery check facility. DM900 is an attractive hand-held lightweight device, built into a high impact case with carrying handle and has been ingeniously designed to 96364. 16 lines by 64 characters, text refreshment, cursor management on TV screen, line erasing, line end erasing. Compatible with any computing system. (Send 20p plus SAE for full technical data.) 611.50. SFF 96364E 64.50* AY -5-1013 UART 68.20* 71301 ROM 62.05° SFS80102 RAM 1K simplify assembly. Never before have all these features been offered 74LS163 RAM to the electronics enthusiast in a single unit. Complete module Price: 854.50. only (p&p insured add 75p) ASCII Keyboards' Ready Built units available on order Send SAE for leaflet. (Demonstration on at our shop) I'rartical Electronics October 1978 60.95. 6136.50. Full 56 Key ASC II coded keyboards now available. 649.50* (P & P 75p1 BC1098* 12 BD132* 38 BC109C* 12 8D133* 43 BC113 17 BD135* 36 BC114 19 BD136* 37 19 80137* 38 BC115 BC116 19 8D138* 36 BC117 15 BD139* 36 BC118 19 80140* 38 BC119* 26 80142* 59 BC134 19 BD145* 198 BC135 BC136 5C137 BC140* BC142* BC143* BCI47 BC148 582114,39 BC154 BC157 BC158 BC159 BC160 BC167A BC168C BC169C 20 60222* 80 MJE371* 60 MJE520* 46 MJE521* 65 MJE2955*11 MJE3055*80 MPF102 MPF103 MPF104 MPF105 MPF106 MPF107 TIP34B* 110 TIP34C* 110 TIP35* 219 TIP35A* 225 TIP35C* 270 30 TIP36A* 265 36 TIP36C* 325 36 38 50 50 TIP41A* TIP418* TIP42A* TIP428* 63 73 64 82 MPSA12 MPSA55 MPSA55 MPSA70 40 24 24 34 MPSUO5 MPSUO5 48 54 TIS43 TIS44 TIS46 TIS50 TIS60 TIS62 TIS74 TIS90 36 45 45 47 45 45 47 MPSA05* 24 MPSA06* 24 18 BD695A* 75 28 25 25 BDY17* 195 BDY60* 110 BDY61* 165 5F115* 22 MPSUO2* 58 20 BD696A* 75 7 7 8 14 BF154* BFI 56* 8F167 14 BF173* 10 BF177* 11 11 27 11 BF178* 13F179* BF180* BF181* 12 BF182* 10 BF183* 25 29 25 25 24 25 30 20 30 30 30 MPSU52* 65 MPSU55* 63 MPSU56* 56 MPU131* 39 0C25* 120 0C26* 0C28* 0C29* 0C35* 150 99 180 80 TIP2955* 63 TIP3055* 52 18 2N2368* 21 2N2369* 15 2N2476* 125 2N2483* 28 2N2484* 30 2N2646* 48 2N2784* 55 40316* 40317* 40324 40326* 40327* 40347* 52 85 52 62 80 40348* 101 40360* 43 2N2894* 30 40361* 45 2N2904A*22 40362* 48 50 2N2905A*20 40407* 289 2N2906* 18 40411* 2N2907* 20 40412* 63 95 2N2907A*22 40467 2N2926G 10 40576* 190 40594* 80 2N29260 90 2N2926R 8 40595* 85 2N2926Y 8 40603* 2N3011* 24 40636* 125 2N3053* 20 40673* 88 2N3054* 49 2N2846* 140 2N3055* 55 T1591 22 ZTX107 ZTX108 ZTX109 ZTX300 ZTX301 ZTX302 ZTX303 13 I 2N3135 16 2N3250 18' 2N3252 2N3302 21 2N3108 11 11' 2N3121 11 :2N3133 39 40 43 33 30 36 Diodes 11,14148 4 CR033* 148 Zeners 400mw 2 7-33v 9 35' 1037 y 1 THE PIONEERS OF MODULAR DISCO/P.A. EQUIPMENT NOW OFFER PACKAGE DEALS AT INCOMPARABLE PRICES CENTAUR COMPLETE STEREO MINI DISCO ROADSHOWS - BUILT IN TO LIGHT/SEQUENCER & DISPLAY STEREO DISCOS SOUND C/W LIGHT SHOW & DISPLAY, TWIN SPEAKERS & LEADS 100 WATT MONO SYSTEM ,.,,TWO YEAR GUARANTEE ,,,,,,,.... .......... .., Standard 100W £249 or Deposit £57.12 £179.50 Deposit £41.66 12 Months 4 £15.56 + Carr. £15 I, 12 Months g £21.75 or 24 Months @ £12.26 + cam £15 Super 200W £299 or Deposit £68.12 Headphones to suit any system EM507 Electret Mic ECM 81 Electret Mic Boom Stand Carriage on all disco and PA systems (Included in H.P. Prices) A 6S, ''' " '''' Similar in appearance to the Centaur and complete with loudspeakers and leads. to .11L 12 Months u £25.86 or 24 Months 4 £14.56 + corr. £15 GXL 200W( illustration shows GX1 Centaur System wwaithtitcwaibnin2e0Ots £389 or Deposit £87.32 _ 20% Deposit Terms On All Orders systems feature full mixing for two decks tape 8 mic with monitoring facilities - override and are supplied complete w:+ sound to light sequencer, display, speaker leads etc. , Over £150 - 12 or 24 12 Months @ £33.31 or 24 Months @ £18.76 JUST PLUG IN AND GO! + corr. £15 BSR Decks - 17,000 Line Loudspeakers - Rugged Aluminium Trimmed Cabinets - Cue Light And Phones Output - Slave Output - Deck Lights/Motor Starts (GXL) D.I.Y. MODULES FOR ALL DISCO/P.A. AMPLIFIERS SA308 30W 8 ohms 45V SA604 60W 4 ohms 50V SA608 60W 8 ohms 65V SA1204 120W 4 ohms 15V SAI208 120W 8 ohms 95V SA2404 240W 4 ohms 95V £9.95* 'Z1'0%1. ) £13.25 £14.25 ZioZus £15.95 ' 7=, £21.00 siZZLis £29.50 '0= «,:(0,,,,,,,fpoui,,, Months - Low Interest DISCO MIXERS - COMPLETE OR MODULAR £10.90* --s--i`"k i 1 "5 '3 ') 1 C) 0 C) (3 (3 ID (3 r 4.... £13'50 Available complete and ready to plug in or as an easy to connect module with all controls except , 0 monitor switch already fitted - full instructions ts £22.50 supplied. FEATURES INCLUDE: 0 2% Distortion, 30Hz20, KHz , 2dB, Fully Short/Open Circuit proof input itiv 240 mV to suit most mixers - D.C. 8 Output Fuses fitted sensity Twin Deck - Mt< 8 Tape Inputs - Wide range bass 'fif ' 8 treble controls - Full headphone monitoring c,o,rod.- Professional standard performonce. TOP QUALITY COMPONENTS THROUGHOUT .41 ...11 -41111 Id .").1. Lighting Control Unit Mk II E44.50 4kW Sequencer Sound Light Dimmers Automatic Level Integrated Logic Module E32.50 Circuitry Panel £2.95 Three Channel Sound to Light 3kW 1-240W input - master Plus channel controls £39.50 per 30ft. Panel E2.95 Rope Light Controller for up to 120 ft £30.00 Fuzz Lights-Red/Blue/Yellow/Green E22.80 Magnetic Cartridge Equalisers (3.50* Bulgin 8 way lighting plug/socket (63.75 Stereo mains 18" £47.50 £37.50 PROJECTORS - PLUTO - NEW LOW PRICES!!! CHOICE OF WHEEL/CASSETTE £59.00 £7.50* £7.50 E1.90 (Add (I 50 corr Empty Loudspeaker Cabinets: Small 12" E15.50, Large 2 x 12" E28 Large 12" £21.50 1 x 18" E29.50 Projector lamps: Al 167 E2.90. M6 E5.65. 100W Spot lamps Red/Blue/Yellow/Green E1 .50 ea E13.50 for 10 MD Spot Banks: 3 -way 300W £19.50, 4 -way 400W (22.50. Bubble machines (optikinetics) £41.50 Strobe tubes 80W E8.50 ICI Vynide 50" wide E3.50 Metre Kickproof Grille 24" wide £3.25 Metre Kick Resistant Grill 50" wide (3.25 Metre. 1038 E22.50 E33.50 E3.95 Kit of knobs/sockets etc E5.50 COMPLETE MIXERS (with case) Mono I 8V E39.50 Stereo 18V E57.50 Mono mein, E45.75 Panel Super Strobe 2-3 Joules £22.50 (Pro -Strobe has external trigger facility). » £26.75 Module E19.75 Melos Echo Chamber Headphones Sirens: English Police, USA Police, Destroyer, Alien Voice Simulator 100 Watt Chassis Loudspeakers 12" £23.50 MODULES Mono module Stereo module Pro -Strobe 4-6 Joules SPARES & ACCESSORIES - LOUDSPEAKERS & CABINETS Rope Lights - Red or Multicolour MONO OR STEREO WITH AUTOFADE STROBE UNITS COMPLETE LIGHTING CONTROL AT YOUR FINGERTIPS! co, in, tn, In, £7.50 £15.00 £19.95 £15.50 £10.00 Small 2 x 12" E22.50 FULL RANGE OF REAN PRODUCTS IN STOCK SEND FOR OUR BROCHURE NOW!! : P150 150W Tungsten P500 100W O.I. P500 250W 0.1. £37.50 £74.95 £84.95 Liquid wheels Cassettes Picture wheels from £7.50 £8.00 £4.75 (Wide choice available) PIEZO HORNS only £7.50 YES! - only £7.50 As fitted to our package PA system) Direct from Motorola Inc., USA at an UNBEATABLE PRICE No crossover required 4kHz - 30kHz rated 75W/8 ohms 150W/4 ohms use two per 100W amplifier - Full instructions supplied. Practical Electronics October 1978 TRIAC BARGAINS BAD NEWS FOR KNOB PACKAGE P.A. SYSTEMS (Guarantee) Complete with PIEZO horn columns fitted with 100 watt units (100 watt system illustrated) 100 Watt f159.90 TWIDDLERS A 300W Lightdimmer with NO knob. Dariming and on/ott functions are controlled by touch. Feature=. include: 12 Months w £14.28 178p 20A 2059 25A SCR IC106131 5A/400V 54p 23p Diac * Can be switched and dimmed from many locations using TDE(K kit making 2 -way switching easy. ** PRICE £9.67 TDE/K £1.08. COMPONENTS £4.32 £3.02 Includes 4 Channel 100 Watt Amplifier with Treble, Bass and Master Controls plus Leads delay off. and Twin Piezo Horn Columns (shown on right). DIGITAL VOLTMETER/THERMOMETER KIT LD300K LIGHIDIMMER ". ........ 200 Watt £249.00 '1-gr. Based on the 7106 single Deposit £57.12 IC 33 digit D.V.M. the Kit contains a PCB, re- 12 Months@ £19.11 or 24 Months @ £10.66 zsix Mixed Inputs plus Three Sets of Bass and Treble Controls plus Slave Output and Master sistors, capacitors, pre- sets. I.C. and 0.5" liquid crystal display. Components are also included to enable the basic D.V.M. kit to be modified to a Digital Thermometer Control. ACCESSORIES using a single transistor Melos Echo Unit £59.00 as the sensor. ONLY £23.75 A high quality Cassette Tape Echo Unit giving long tape life, infinitely variable echo depth and speed control. Suitable for all mics. and £19.95.* EM507 Condenser Mic. - Good £5.23 £1.94 £9.99 7p 5p I 1p 25p MINI MAINS TRANSFORMERS Standard 240V mains primary 100mA secondary 92p 6-0-6V 97p 9-0-9V 102p 12-0 12V ABOVE PRICES INCLUDE V.A.T. Make your own mixer - Mono/Stereo - up to 20 channels with these, easy to wire modules - Available as PCB's or MonoMono CiW E panel etc £9.50 £3.51 £2.70 - undrilled £2.38 D.I.Y. MODULES FOR P.A. SYSTEMS Mono or stereo S £1.08 IC AY -5-1224 AY -5-1230 ZN1034E ICL7106 DVM IC IN4001 IN4148 BC182L 2N3819 White box 156 x 131 x 71mm) - drilled Value £15.00. Phasers £19.80. Up to 10 11p (813p,101 27p 23p Yellow £1.62 DL72 7 .5" display £9.72 LCD .5" 4 digit 45p LEM .5" dia. 14 for El .081 NE555 31p 15 for £1 .081 741 27p LM3911 temperature Red Green Switches any appliance of up to 1KWon and oft at preset times once a day. KIT contains: AY -5-12 30 Clock/Appliance Timer IC, 0.5" LED display, mains supply, display drivers, switches, LEDs. triec. complete with PCBs and full instructions. £14.85 - Input Stages 0.2" L.E.s 24HR CLOCK/APPLIANCE TIMER KIT instruments. High quality Boom Stand £15.50. Floor Stand £9.90. ECM81 Condenser Mic. Removable Lead - Good Anti -Feedback assembled on panels. 84p 869 80p 90p 11