HI ILIAPE LINK Is This the Price Youpay?
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PRACTICAL ELEC ONICS MARCH 1973 20p BI AS 3.75 S ORO VU BIAS 1138 75 Mi. - .......tttttttttt ** t - ******** ******** HI ILIAPE LINK is this the price youpay? Probably, if you're still using an ordinary soldering iron. Ordinary soldering irons can cause damage to transistors and integrated circuits - damage which wastes time and costs money. Now, with the unique ANTEX X25 and CCN low leakage soldering irons no harm can come to the most delicate equipment, even when soldered 'Live' (You could be making quite a saving). MODEL X25 220-240 Volts or 100-120 Volts. The leakage current of the NEW MODEL G X25 is only a few microamps and 18 watt miniature iron, fitted cannot harm the most delicat, with long life iron -coated bit equipment even when soldered 3/32". Vol -ages 240,220 "live". Tested at 1500v. A.C. MODEL or 110. PRICE: £1.83 This 25 watt iron with it's CCN Irec. retail). truly remarkable heat -capa- 220 volts or city will easily "out -solder" 240 volts. The any conventionally -made 15 watt miniature 40 and 60 watt soldering model CCN irons, due to its unique also has negligible s*" construct ion.advantages. leakage. Fitted long -life iron - Test voltage 4000v.`\, coated bit 1/8". 2 A.C. Totally enclosed MODEL CN other bits avail- element in ceramic shaft. able 3/32" and Miniature 15 watt Fitted long -life iron -coated soldering iron fitted N MODEL CN2 3/16". Totally bit 3/32. 4 other bits enclosed element 3/32" iron -coated \Miniature 15 watt solde ing available 1/8", 3/16", 1/4" bit. Many other bits,)iron fitted with ceramic and steel and 3/64". shaft. Bits do not available from 3/64" nickel plated bit 3/32". PRICE: £1.80 Irec. retail) to 3/16". Voltages 240, Voltages 240 or 220. "freeze" and can OR Fitted with triple -coated, easily be 220, 110, 50 or 24. PRICE: £1.70 iron nickel and Chromium bit 1/8".\ removed PRICE: £1.70 (rec. retail) Irec. retail) PRICE: £1.95 Irec. retail) j, PRICE: £1.75 (rec. retail) / Suitable for production work and as a general purpose iron. MODEL SK.2 KIT Contains 15 watt miniature MODEL MES.KIT iron fitted with 3/16" Battery -operated 12v. bit, 2 spare 25 watt iron fitted MODEL bits 5/32" , and 3/32" with 15' lead and 2 SK.1 KIT heat sink, heavy clips for con- Contains 15 watt solder, stand nection to car battery. miniature iron fitted with 3/16" and "How to Packed in strong plas- bit, 2 spare bits 5/32" and Solder" tic wallet with booklet 3/32", heat sink, solder, stand book let. "How to Solder" and "How to Solder" booklet. PRICE: £2.40 PRICE: £1.95 Irec. retail) PRICE: £2.75 Irec. retail) (rec. retail) Please send the ANT EX I enclose cheque/P.O./Cash colour catalogue. (Giro No. 2581000) Please send the following: I From radio or electrical dealers, NAME car accessory shops or ADDRESS in case of difficulty direct from:- ANTEX LTD. FREEPOST no stamp required) PLYMOUTH PL1 1BR Tel: 0752 67377. Pd PRACTICAL ELECTRONICS VOLUME 9 No. 3MARCH 1973 CONSTRUCTIONAL PROJECTS HI Fl TAPE LINK by P. S. Ewer All the electronics to bring Hi Fi to an existing tape deck 210 P.E. SOUND SYNTHESISER -2 by G. D. Shaw Twin stabilised power supply unit and racking details 232 SIGNAL INJECTOR and TRACER by R. A. Penfold Useful dual-purpose item of test gear for a.f. and r.f. applications 238 P.E. DIGI-CAL-9 by R. W. Co/es Logic and construction of the programme board 242 GENERAL FEATURES ELECTRONIC TIMEPIECES -1 by J. B. Dance Evolution of designs up to tuning -fork principle 221 DESIGNING WITH I.C.s-6 by A. Foord Basic memory circuits 249 NEWS AND COMMENT EDITORIAL-Our Transistor 209 SPACEWATCH by Frank W. Hyde Is someone tryihg to contact us?-USSR meteorite research 217 ON THE FRINGE by Gerry Brown The more unusual aspects of electronics 218 INDUSTRY NOTEBOOK by Nexus What's happening inside industry 226 TRANSISTOR SILVER JUBILEE The team behind the invention-anniversary events 229 TRANSISTOR TRAIL Highlights of research and development leading to the first transistor 230 NEWS BRIEFS Tidal Monitoring-Radar Testing-UK Tops In Data Transmission 241 POINTS ARISING Biological Amplifier-I.C. Linear Ohmmeter 241 BOAT SHOW REPORT A look at marine electronics for the small boat owner 253 PATENTS REVIEW Thought provoking ideas on file at the British Patents Office 254 MARKET PLACE New products and component information 258 Our April issue will be published on Friday, March 9, 1973 Cc) IPC Magazines Limited 1973. Copyright inall drawings, 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.Subscription Rates including postage for one year, to any part of the world, £2.65. PracticalElectronics March1973 185 THE FABULOUSLY SUCCESSFUL VISCOUNT III AUDIO £52complete 14 + 14 watts r.m.s. 40Hz to 40kHzr.3dB. Total distortion at 10 watts PR CES SYSTEM Viscount III R 101 amplifierL22.00 +90p p&p at !kHz- 01%. 2 Duo Type 11 speakers L14.00 -1-L2 p&p This is real value for money! We have designed 2 systems and the heart of them Garrard SP25 Mk. 111 with all is the Viscount Ill amplifier. A unit of great eye appeal with teak finished cabinet. MAG. cartridge plinth and FET's (Field effect transistors) are incorporated on the input stages, just like top cover L23.00 +L1.50 p&p priced units.FET's give you more of the signal you want and almost none of the Total L59.00 hiss you don't.Both units have output sockets for headphones and tape recorder. Available complete for only L52 Filters and tone controls give a wide range of bass and treble adjustment. i- L350 p & p For both systems we have chosen the famous Garrard SP25 Mk.Ill deck, with fitted magnetic cartridge, which comes complete with simulated teak plinth and PRICES: SYSTEM 2 tinted acrylic cover. Viscount R 101 amplifier C22.00 +90p p&p The exclusive Duo loudspeaker systems are incomparable for quality within their 2 > Duo Type 111 speakersL32-00+0 p&p G d SP25 Mk. 111 with price range.Large speakers in extremely substantial cabinets.There's a choice of MAG cartridge plinth and the Duo II's for the smaller room or the big Duo II I's for real bass response. cover C23.00+ L150 p&p SPEAKERS Total 07.00 Duo Type II Size approx. 17in. 101 in. 61 in. Drive unit I3in. 8in. with parasitic tweeter. Available complete for L69 L4 p & p Max power 10 watts, 8 ohms. Simulated Teak cabinet. II4 pair + C3 p & p. Duo Type I 11 Size approx. 23fin. II lin. ',fin. Drive unit 13fin. 8,1in. with H.F.speaker. Max power 20 watts 8 ohms. Freq. range 20Hz to 20kHz. Teak veneer cabinet. C32 pair + C3 p & p. SPECIFICATION R101 distortion IOW I kHz 0.1%. P.U.I. (for ceramic cartridges) 150rnV into 3 Meg. P.U.2. (for magnetic cartridges) 4mV . [kHz into 47K equalised within ±1dB R.I.A.A. Radio 150mV into 220K. (Sensi- tivities given at full power.) Tape out facilities: headphone socket, power out 250mW per channel. Tone controls and filter characteristics. Bass: -I-12dB to -17dB 601-4z. Bass filter: 6dB per octave cut. Treble control: treble -1-I2dB to -I2dB 15kHz. Treble filter: 12dB per octave. Signal-to-noise ratio: (all controls at max) -P.U.I. and radio -65dB, P.U.2 -58dB. Cross talk better than -35dB on all inputs. Overload characteristics better than 26dB on all inputs. Size approx. 131in. 9in. 3/in. Send S.A.E. for fully illustrated brochure. 12 MONTHS' WRITTEN GUARANTEE.British made. S.A.E. for illustrated leaflet. -ONLY FROM US Times of opening: Acton-Mon.-Sat. 9.30-5. Closed all day Wed. Edgware Rd.-Mon.-Sat. 9.30-5. Closed all day Thurs. 186 PracticalElectronics March1973 MUSIC MAKERS UNISOUND FOR THE NEW SOUND The whole system is complete including superb cabinets in simulated teakjust simply screw hcaos emdp o. nn faanmd oy;ou ei e! system.Gharradrdi 202d5TC trntable.cpolms- AT stereo ceramic ge the bigI 3in. Bin. EMI Twin -cone speakers ready for mounting in their elegant cabinets, which simply need screwing and gluing together. All glue and screws supplied. Easy to fellow step-by-step instructions guide you quickly and effortlessly to taking the wraps off truly realistic stereo sound. E25 complete plus E280 p. & p. Diamond Stylus EI25 extra. Power output: 4 watts per channel into 8 ohms. Inputs:120 mV (for ceramic cartridges). Stereo headphones with adaptor C4.00. UNISOUND MODULES ONLY E6.95 If you prefer, you can buy the three modules-pre-amplifier Power .4,1,1Y/dual power amplifier, and control panel-by themselves for only L6(95. P. & P. 50p extra. No soldering, just simply screw together with screwdriver supplied. Their overall specification is the same as shown for the complete Unisound console, using the high efficient I.C. mono- lithic power chips to ensure very low distortion at all power levels, correct operation in all ambient temperatures, full power over the audio spectrum.