FULLY S.O.R. £2.25


OUMMETER ADAPTOR & Converts a DMM to read low value resistance @


SECURITY SYSTEM All round protection fo your home, garage, shed gig


9"770262" 361065


WIRELESS VIDEO BUG KIT Transmits video and audio signals from a minature CCTV camera (included) to any standard television! Allthe components including a PP3 battery will fitinto a cigarette packet with the lens requiring ahole about 3mm diameter. Supplied with telescopic aerial but a piece of wire about 4" long will still give a range of up to 100 metres. A single PP3 will probably give less than 1 hours operating time. £99 REF EP79. (probably not licensable!)

GOT AN EXPENSIVE BIKE? You need one of our bottle alarms, they look like a standard water bottle, but open the top, insert a key to activate a motion sensor alarm built inside. Fits all standard bottle carriers, supplied with two keys. SALE PRICE £7.99 REF SA32.

GOT AN EXPENSIVE ANYTHING? You need one of our cased vibration alarms, keyswitch operated, fully cased just fit it to anything from videos to caravans, provides a years protection from 1 PP3 battery, and protect it! UK made. SALE PRICE £4.99 REF SA33.

DAMAGED ANSWER PHONES These are probably beyond repair so they are just£4.99 each. Mainly response 200 machines. REF SA30.

COMMODORE GAMES CONSOLES Justa fewof these left to clear at £5 ref SA31. Condition unknown. COMPUTER DISC CLEAROUT We are left with a lot of software packs that need clearing so we are selling at disc value only! 50 discs for £4, thats just 8p each!!(our choice of discs) SALE PRICE £4 ref EP66

IBM PS2 MODEL 150Z CASE AND POWER SUPPLY Complete with fan etc and 200 watt power supply. SALE PRICE £9.95 ref EP67

DELL PC POWER SUPPLIES 145 watt, +5,-5,+12,-12, 150x150x85mm complete with switch, flyleadsand|EC socket. SALE PRICE £9.99 ref EP55

1.44 DISC DRIVES Standard PC 3.5" drives but returns so they will need attention SALE PRICE £4.99 ref EP68

1.2 DISC DRIVES Standard 5.25" drives but returns so they will need attention SALE PRICE £4.99 ref EP69

PP3 NICADS New and unused but some storage marks. SALE PRICE £4.99 ref EP52

SOLAR PANELS 3v output with two flyleads, 100x60 mm pack of 10 SALE PRICE £6.99 ref EP56

DELL PC POWER SUPPLIES (Customer returns) Standard PC psu's complete with fly leads, case and fan, pack of two psus SALE PRICE £5 FOR TWO!! ref EP61

GAS HOBS AND OVENS Brand new gas appliances, perfect for small flats etc. Basic 3 burner hob SALE PRICE £24.99 ref EP72. Basic small built in oven SALE PRICE £79 ref EP73

BITS AND BOBS We have a quantity of cased modems, multiplexers etc different specs but ideal strippers. SALE PRICE £4 each ref EP63

RED EYE SECURITY PROTECTOR 1,000 watt outdoor PIR switch SALE PRICE £9.99 ref EP57

ENERGY BANK KIT 100 6"x6" 6v 100mA panels, 100 diodes, connection details etc. £69.95 ref EF112.

CCTV CAMERA MODULES 46X70X29mm, 30 grams, 12v 100mA. auto electronic shutter, 3.6mm F2 lens, CCIR, 512x492 pixels, video output is 1v p-p (75 ohm). Works directly into a scart or video input on a tvor video. IR sensitive. £79.95 ref EF 137.

IR LAMP KIT Suitable for the above camera enables the camera to be used in total darkness! £5.99 ref EF 138. PASTELACCOUNTS SOFTWARE, does everything for all sizes of businesses, includes wordprocessor, report writer, windowing, networkable up to 10 stations, multiple cash books etc. 200 page comprehensive manual. 90 days free technical support (0345-326009 try before you buy!) Current retail price is £129, SALE PRICE £9.95 ref SA12. SAVE £120!!!

MINI MICRO FANS 12V 1.5" sq SALE PRICE £2. Ref SA13.

C ITOH PRINTERS 80 col, 9 pin matrix, serial/parallel, NLQ/draft, 3 mth warranty, good condition, SALE PRICE £39 ref SA14.

REUSEABLE HEAT PACKS. Idealfor fishermen, outdoor enthusiasts elderly orinfirm, warming food, drinks etc, defrosting pipes etc.reuseable up to 10 times, lasts for up to 8 hours per go, 2,000wh energy, gets up to 90 degC. SALE PRICE £9.95 REF SA29

A4 DTP MONITORS Brand new, 300 DPI. Complete with diagram but no interface details.(so you will have to work it out!) Bargain at just £7.99 each!!!! Ref EF185

12V 2AMP LAPT OP psu's 110x55x40mm (includes standard IEC socket) and 2m lead with plug. 100-240v IP. SALE PRICE £6.99 REF SA15.

PC CONTROLLED 4 CHANNEL TIMER Control (on/off times etc) up to 4 items (8A 240v each) with this kit. Complete with Software, relays, PCB etc. £25.99 Ref 95/26 COMPLETE PC 300 WATT UPS SYSTEM Top of the range UPS system providing protection for your computer system and valuablesoftware against mains power fluctuations and cuts.New and boxed, UK made Provides up to 5 mins running time in the event of complete power failure to allow you to run your system down correctly. SALE PRICE just £89.00. SOLAR PATH LIGHTS Lowenergy walklights powered by th sun! builtin PIR so they work when you walk past. Includes solar panel & rechargeable bat. SALE PRICE £19.9REF EP62

BIG BROTHER PSU Cased PSU, 6v 2A output,

2m o/p lead, 1.5m input lead, UK made,220v. SALE PRICE £4.99 REF EP7


IDEA? We have collated 140 business manuals that give you information on setting up different businesses, you peruse these at your leisure using the text editor on your PC. Also included is a certificate enabling

you to reproduce the manuals as much as you like! SALE PRICE £14 REF EP74

RACAL MODEM BONANZA! 1 Racal MPS1223 1200/75 modem, telephone lead, mains lead, manual and comms software, the cheapest way onto the net! all this for just £13 ref DEC13.

HOW LOW ARE YOUR FLOPPIES? 3.5" (1.44) unbranded. We have sold 100,000+ so ok! Pack of 50 £24.99 ref DEC16

Smw LASER POINTER. Supplied in kit form, complete with power adjuster, 1-Smw, and beam divergence adjuster. Runs on 2AAA batteries. Produces thin red beam ideal for levels, gun sights, experiments etc. Cheapest in the UK! just £39.95 ref DEC49

RADIO PAGERSBrand new, UK made pocket pagers clearance price is just £4.99 each 100x40x15mm packed with bits! Ref SEPS5.

BULL TENS UNIT Fully built and tested TENS (Transcutaneous Electrical Nerve Stimulation) unit, complete with electrodes and full instructions. TENS is used for the relief of pain etc in up to 70% of sufferers. Drug free pain relief, safe and easy to use, can be used in conjunction with analgesics etc. £49 Ref TEN/1

COMPUTER RS232 TERMINALS. (LIBERTY)Excellent quality modern units,(like wyse 50,s) 2xRS232, 20 function keys, 50 thro to 38,400 baud, menu driven port, screen, cursor, and keyboard setup menus (18 menu's). £29 REF NOV4. PC PAL VGA TOTV CONVERTER Converts a colour TV into a basic VGA screen. Complete with built in psu, lead and s/ware.. Ideal for laptops or a cheap upgrade.Supplied in kit form for home assembly. SALE PRICE £25 REF SA34 EMERGENCY LIGHTING UNIT Complete unit with 2 double bulb floodlights, built in charger and auto switch. Fully cased. 6v 8AH lead acid req'd. (secondhand) £4 ref MAG4P11. SWINGFIRE GUIDED MISSILE WIRE. 4,200 metre ree! of ultra thin 4 core insulated cable, 28lbs breaking strain, less than 1mm thick! Ideal alarms, intercoms, fishing, dolls house's etc. SALE PRICE £13.99 ref EP51

ELECTRIC CAR WINDOW DE-ICERS Complete with cable, plug etc SALE PRICE JUST £4.99 REF SA28 ASTEC SWITCHED MODE PSU BM41012 Gives +5 @ 3.75A, +12@1.5A, -12@.4A. 230/110, cased, BM41012. £5.99 ref AUG6P3.

AUTO SUNCHARGER 155x300mm solar panel with diode and 3 metre lead fitted with a cigar plug. 12v 2watt. SALE PRICE £8.99 REF SA25.


ECLATRON FLASH TUBE As used in police car flashing lights etc, full spec supplied, 60-100 flashes a min. SALE PRICE £6.99 REF SA15.

24v AC S6WATT Cased power supply. New. SALE PRICE JUST £9.99 REF SA40

MILITARY SPEC GEIGER COUNTERS Unused anstraightfrom Her majesty's forces. SALE PRICE £44 REF SA16

MICRODRIVE STRIPPERS Small cased tape drives ideal for stripping, lots of useful goodies including a smart case, and lots of components. SALE PRICE JUST £4.99 FOR FIVE REF SA26

SOLAR POWER LAB SPECIAL You get TWO 6"x6" 6v 130mA solar cells, 4 LED's, wire, buzzer, switch plus 1 relay or motor.Superb value kit SALE PRICE JUST £4.99 REF SA27 RGB/CGA/EGA/TTL COLOUR MONITORS 12" in good

condition. Back anodised metal case. SALE PRICE £49 REF SA16

SWITCHED MODE PSU ex equip, 60w +5v @S5A, -5v@.5A, +12v@2A,-12v@.5A 120/220vcased 245x88x55mm | ECinput socket £6.99 REF MAG7P1

PLUG IN ACORN PSU 19v AC 14w , £2.99 REF MAG3P10 POWER SUPPLY fully cased with mains and o/p leads 17v DC 900m output. Bargain price £5.99 ref MAG6P9



4.4A. on/offswuncased, selectable mains input, 145x100x45mm SALE PRICE £4.99 REF SA1

13.8V 1.9A psu cased with leads. Just £9.99 REF MAG10P3 PPC MODEM CARDS. These are high spec plug in cards made for the Amstrad laptop computers. 2400 baud dial up unit complete with leads. Clearance price is £5 REF: MAGS5P1 200 WATT INVERTER Converts 10-15v DC into either 110v or 240vVAC. Fully cased 115x36x 156mm, complete with heavy duty power lead, cigar plug, AC outlet socket.Auto overload shutdown, auto short circuit shut down, auto input over voltage shutdown, auto input under voltage shut down (with audible alarm), auto temp contro!, unit shuts down if overheated and soundsaudible alarm. Fused reversed polarity protected. output frequency within 2%, voltage within 10%. A well built unit at an keen price. Just £64.99 ref AUG65.

UNIVERSAL SPEED CONTROLLER KIT Designed by us for the C5 motor but ok for any 12v motor up to 30A. Complete with PCB etc. A heat sink may be required. £17.00 REF: MAG17

COMPUTER COMMUNICATIONS PACK Kit contains 100m of 6 core cable, 100 cable clips, 2 line drivers with RS232 interfaces

and all connectors etc. Ideallow cost method of communicating between PC's over a long distance. Complete kit £8.99. ELECTRIC MOTOR KIT Comprehensive educational kit includes all you need to build an electric motor. £9.99 ref MAR10P4.

VIEWDATA SYSTEMS made by Phillips, complete with internal 1200/75 modem, keyboard, psu etc RGB and composite outputs, menu driven, autodialler etc. SALE PRICE £12.99 REF SA18

AIR RIFLES .22 As used by the Chinese army for training puposes, so there is a lot about! £39.95 Ref EF78. 500 pellets £4.50 ref EF80.

PLUG IN POWER SUPPLY SALE FROM £1.50 Plugs in to 13A socket with output lead. three types available, 9vdc 150mA £1.50 ref SA19, 9vdc 200mA £2.00 ref SA20, 6.5vdc 500mA £2 ref SA21.

VIDEO SENDER UNIT. Transmits both audio and video signals from either a video camera, video recorder, TV or Computer etc to any standard TV set in a 100' range! (tune TV to a spare channel) 12vDC op. Price is£15 REF: MAG15 12v psu is £5 extra REF: MAGSP2

*FM CORDLESS MICROPHONE Small hand held unit with a 500' range! 2 transmit power levels. Reqs PP3 9v battery. Tuneable to any FM receiver. Price is £15 REF: MAG15P1 *MINATURE RADIO TRANSCEIVERS A pair of walkie talkies with a range up to 2 km in open country. Units measure 22x52x155mm. Including cases and earp'ces. 2xPP3 req'd. £30.00 pr.REF: MAG30

FUTURE PC POWER SUPPLIES These are 295x 135x60mm, 4 drive connectors 1 mother board connector. 150watt, 12vfan, iec inlet and on/off switch. SALE PRICE £7.99 REF SA 22

*FM TRANSMITTER KIT housed in a standard working 13A adapter!! the bug runs directly off the mains so lasts forever! why pay £700? or price is £15 REF: EF62 Transmits to any FM radio. (this is in kit form with full instructions. )

*FM BUG BUILT AND TESTED superior design to kit. Supplied to detective agencies. 9v battery req’d. £14 REF: MAG14

TALKING COINBOX STRIPPER COMPLETE WITH COINSLOT MECHANISMS originally made to retail at £79 each, these units are designed to convert an ordinary phone into a payphone. The units have the locks missing and sometimes broken hinges. However they can be adapted for their original use or used for something else?? SALE PRICE JUST £2.50 REF SA23

GAT AIR PISTOL PACK Complete with pistol, darts and pellets £12.95 Ref EF82 extra pellets (500) £4.50 ref EF80. 6"X12" AMORPHOUS SOLAR PANEL 12v 155x310mm 130mA. SALE PRICE £4.99 REF SA24.


£4.99 ref MAG5P13 ideal for experimenters! 30 m for £12.99 ref MAG13P1






A Hand held personal Gamma and X Ray detec tor. This unit contains two Geiger Tubes, has a 4


digit LCD display with a Piezo speaker, giving a audio visual indication. The unit detects hig energy electromagnetic quanta with an energ from 30K eV to over 1.2M eV and a measuring range of 5-9999 UR/h or 10-99990 Nr/h. ref NOV18




VOL. 24 No.9 SEPTEMBER 1995 The No. 1 Independent Magazine for Electronics, Technology and Computer Projects


SIMPLE THEREMIN by Jake Rothman 674 Making music by sleight of hand pocket-sized instrument echoes the 1920s

LOW RANGE OHMMETER ADAPTOR by Steve Knight «684 Allows a DVM to measure resistances below 12. Easy to calibrate COMPREHENSIVE SECURITY SYSTEM by Duncan Boyd 688 Give all-round protection to your garden shed, garden furniture and home VANDATA by Peter Unwin | 706 Constant “cockpit” display confirms caravan lights integrity while en-route HUM-FREE BATTERY ELIMINATOR by Andy Flind 726

Providing very quiet power for personal audio amplifiers of " ag

INGENUITY UNLIMITED by Enthusiastic Readers 696

The circuit showcase for readers’ designs

TECHNIQUES - ACTUALLY DOING IT by Robert Penfold 702 We may not “surf the stripboard”’ but there’s other jargon to cope with! INTERFACE by Robert Penfold 717 Hardware detecting Morse signals helps relieve the computer's task

CAVE RADIO By Mike Bedford 721 Can you help to improve cave safety through a better comms link?

AMATEUR RADIO by Tony Smith G4FAI 736

RAE classes; Special interest groups; News bulletin trouble spot


EDITORIAL | 673 INNOVATIONS 680 Everyday news from the world of electronics

NEW TECHNOLOGY UPDATE by lan Poole 682. The latest SiGe developments improve junction gains and speed

FOX REPORT by Barry Fox 3 700 The loss of the important Alan Blumlein archives would be scandalous ELECTRONICS VIDEOS 701 Our range of educational videos

BACK ISSUES 704 Did you miss these?

OHM SWEET OHM by Max Fidling 715 Electro-plumbing the plants at Fidling Acres makes Piddles melon-choly! SHOPTALK with David Barrington 724 Component buying for EPE projects

DIRECT BOOK SERVICE 731 A wide range of technical books available by mail order

PRINTED CIRCUIT BOARD SERVICE 734 PCBs for EPE projects some at knock-down prices!


© Wimborne Publishing Ltd 1995. Copyright in all

drawings, photographs and articles published in & R E E EVERYDAY with PRACTICAL ELECTRONICS is fully

protected, and reproduction or imitations in whole GREENWELD SUMMER SALE CATALOGUE . or in part are expressly forbidden. between pages 700 /701

_ Our October ’95 Issue will be published on Friday, Readers Service @ Editorial and Advertisement Departments 673 1 September 1995. See page 663 for details.

Everyday with Practical Electronics, September 1995 661





AT 286 40Mb HD + 3Mb Ram

with battery backup is provided as standard. Supplied in good used condition complete with enhanced keyboard, 640k + 2Mb RAM, DOS 4.01 and 90 DAY Full Guarantee. Ready to Run !

Order as HIGRADE 286 OA/Z Y £149.00 (E)


Optional Fitted extras: VGA graphics card 1.4Mb 3%" floppy disk drive (instead of 1.2 Mb) NE2000 Ethernet (thick, thin or twisted) network card


5%" from £22.95 - 3%" from £24.95

Massive purchases of standard 5%" and 3%" drives enables us to present prime product at industry beating low prices! All units (unless Stated) are BRAND NEW or removed from often brand new equip- ment and are fully tested, aligned and shipped to you with a 90 day guarantee and operate from standard voltages and are of standard size. All are IBM-PC compatible (if 3/2" supported on your PC).

3%" Panasonic JU363/4 720K or equivalent £24.95(B 3%" Mitsubishi MF355C-L. 1.4 Meg. Laptops only * £36.95(B 3%" Mitsubishi MF355C-D. 1.4 Meg. Non laptop £29.95(B 5%" Teac FD-55GFR 1.2 Meg £29.95(B 5%" BRAND NEW Mitsubishi MF501B 360K £22.95(B * Data cable included in price.

Shugart 800/801 8" SS refurbished & tested £195.00(E Shugart 851 8" double sided refurbished & tested £250.00(E Mitsubishi M2894-63 8" double sided NEW £275.00(E Mitsubishi M2896-63-02U 8" DS slimline NEW £285.00(E

Dual 8" drives with 2 mbyte capacity housed in a smart case with . £499.00(F)

built in power supply. Ideal as exterior drives!


End of line purchase scoop! Brand new NEC D2246 8" 85 Mbyte of hard disk storage! Full industry standard SMD interface. Ultra hi speed data transfer and access time, replaces Fujitsu equivalent

model. complete with manual. Only £299.00(E) 3%" FUJI FK-309-26 20mb MFM I/F RFE £59.95(C 3%" CONNER CP3024 20 mb IDE I/F (or equiv )RFE £69.95(C 3%" CONNER CP3044 40mb IDE I/F (or equiv.)RFE £89.00(C 3%" RODIME RO3057S 45mb SCSI I/F (Mac & Acorn) £99.00(C 5%" MINISCRIBE 3425 20mb MFM I/F (or equiv.) RFE £49.95(C 5%" SEAGATE ST-238R 30 mb RLL I/F Refurb £69.95(C 5%" CDC 94205-51 40mb HH MFM I/F RFE tested £69.95(C 8" FUJITSU M2322K 160Mb SMD I/F RFE tested £195.00(E)

Hard disc controllers for MFM , IDE, SCSI, RLL etc. from £16.95


Converts your colour monitor into a QUALITY COLOUR TV!!



The TELEBOX consists of an attractive fully cased mains powered unit, containing all electronics ready to plug into a host of video moni- tors made by makers such as MICROVITEC, ATARI, SANYO, SONY, COMMODORE, PHILIPS, TATUNG, AMSTRAD etc. The composite video output will also plug directly into most video recorders, allowing reception of TV channels not normally receivable on most television receivers* (TELEBOX MB). Push button controls on the front panel allow reception of 8 fully tuneable ‘off air’ UHF colour television channels. TELEBOX MB covers virtually all televi- sion frequencies VHF and UHF including the HYPERBAND as used by most cable TV operators. A composite video output is located on the rear panel for direct connection to most makes of monitor or desktop video ~ popes For complete compatibility - even . for monitors without sound - an integral 4 watt audio amplifier and low level Hi Fi audio output are provided as standard. TELEBOX ST for composite video input type monitors TELEBOX STL as ST but with integral speaker £37.50 TELEBOX MB Multiband VHF-UHF-Cable- Hyperband.tuner £69.95 For overseas PAL versions state 5.5 or 6mhz sound specification. “For cable / hyperband reception Telebox MB should be connected to cable type service. Shipping code on all Teleboxes is (B


MITSUBISHI MMF-D6D12DL 60 x 25 mm 12v DC MITSUBISHI MMF-09B12DH 92x25mm12vDC £5.95 10/ £53 PANCAKE 12-3.5 92 x 18 mm 12v DC £7.95 10 / £69 EX-EQUIP 120 x 38mm AC fans - tested specify 110 or 240 v £6.95 _ EX-EQUIP 80 x 38mm AC fans - tested specify 110.0r 240 v £5.95 VERO rack mount 1U x 19" fan tray specify 110 or 240v £45.95 (8) IMHOF B26 1900 rack mnt 3U x 19" Blower 110/240v NEW £79.95 Shipping on all fans (A). Blowers (B). 50,000 Fans Ex Stock CALL



5,000,000 items EX STOCK


£4.95 10 / £42

Issue 13 Of Display News now available - send lar LONDON SHOP @JALL MAIL & OFFICES



ri . BR cc > sree 2 PB apcial™ - °

e eee © ® e ee ___e§ Open Mon - Sat 9:00 - 5:30 Open Mon-Fri 9.00-5:30

Be Sa tee ses SO" han iawened Dept EE. 32 Biggin Way

Seco’ oe ° Secce M4 wee eae ee Upper Norwood Selhurst Park SR Rail Stations LONDON SE19 3XF



ONLY £99.00

A massive bulk purchase enables us to bring you a COMPLETE coy! to run colour PC DA ghd at an unheard of price! The Display Electronics PC99 system comprises of fully com- patible and expandable XT PC with 256k of RAM, 5%° k flop- py disk drive, 12" CGA colour monitor, standard 84 key key-

oard, MS DOS and all connecting cables - just plug in and go !! Ideal students, schools or anybody wishing to learn the world of PC's on an ultra low budget. Don't miss this opportunity.

Fully guaranteed for 90 ag Re as PCOSCOL £99.00 (E) £29.00

Optional Fitted extras: 640k RAM 2nd floppy drive, specify 5%" 360k or 3%" 720k £29.95 Above prices for PC99 offer ONLY.



One of the highest specification ate monitors you will ever see - At this price - Don’t miss it!!

com includi SVGA modes, BBC, COMMODORE (including Amiga 1200), ARCHIMEDES and APPLE. Man features: Etched faceplate, text switching and LO et eras yt 7h phe specification. Full 90 day warranty. in condition. . Orderasmits-svca Only £1396 Tilt & Swivel Base £8.00 Leads for IBM PC £8.95 (A) External Cables for other £ CALL

PHILIPS HCS35 ame style as CM8833) attractively styled 14” colour monitor with both RGB and standard composite 15.625 Khz video inputs via SCART socket and separate phono jacks. Integral audio power amp and speaker for all audio visual uses. Will connect direct to Amiga and Atari BBC computers. Ideal for all monitoring / security applications with direct connection to most colour cameras. High quality with many features such as front concealed flap controls, VCR correction button etc. Good used

condition - fully tested with a 90 day guarantee 14" x H12%" x 15%" B. : Only £99

Dimensions: Special Offer save £16.95 - Order TELEBOX ST & HCS35 together - giving you a quality colour TV & AV

system for Only £122.50 (E) KME 10" en 4 definition. colour monitors. Nice tight 0.28" dot pitch

for superb clarity and modern styling. Operates from ; ss any 15.625 khz sync RGB video source, with RGB analog and composite sync such as Atari,# Commodore Amiga, Acorn Archimedes & BBC. 3 Measures only 13%" x 12" x 11". Only £125 (E) Good used condition. 90 vg! Pp seat

KME 10" as above for PC standard £145.00 (E)

PHILIPS HCS31 Ultra compact 9” colour video monitor with stan- dard composite 15.625 Khz video input via SCART socket. Ideal for all monitoring / security applications. High quality, ex-equipment fully tested with a 90 day guarantee (possible minor screen burns). In attractive square black plastic case Magar W10" x H10" x 13%" D. Mains powered Limited Quantity - Only £79.00 (D)

20" 22" and 26" AV SPECIALS

Superbly made UK manufacture. PIL all solid state colour monitors, complete with composite video & optional sound inputs. Attractive teak style case. Perfect for Schools, Shops, Disco, Clubs, etc.In EXCELLENT little used condition with full 90 day guarantee.

20"....£135 22"....£155 26"....£185 (F)


Virtually every type of power supply you can imagine.Over 10,000 Power Supplies Ex Stock

Call for info / list. oy md oh OF 74 RO odd ood

Zeta 3220-05 AO 4 pen HPGL RS232 fast drum plotter £1950 3M VDA - Video Distribution Amps.1 in 32 out £375 Trio 0-18 vdc bench PSU. 30 amps. New £470 Fujitsu M3041 600 LPM band printer £1950 VG Electronics 1035 TELETEXT Decoding Margin Meter £3750

Andrews LARGE 3.1 m Satellite Dish + mount (For Voyager!) £950 RED TOP IR Heat seeking missile (not armed !!) POA

KNS EMC / Line interference tester NEW £1200 Thuriby LA 160B logic analyser £375 INTEL SBC 486/133SE Multibus 486 system. 8Mb Ram £1200 GEC 1.5kw 115v 60hz power source £950 Brush 2Kw 400 Hz 3 phase frequency converter £850 Anton Pillar 75 kW 400 Hz 3.phase frequency converter POA Newton Derby 70 KW 400 Hz 3 phase frequency converter POA COMPONEDEX T1000 Portable TELEX tester NEW £250

Sekonic SD-150H 18 channel digital Hybrid chart recorder £1995 HP 7580A A1 8 pen HPGL high speed drum plotter £1850 Computar MCA1613APC 16mm auto iris lenses 'C' mount Seaward PAT 2000 dual voltage computerised PAT tester Densei MUD 0185AH 1KVa UPS system with batts NEW £575

e SA

Allow approx 6 days


DISTEL © The Original FREE On line Database Info on 1000's of items

V21,V22, V22 BIS 0181 679 1888

All prices for UK Mainland. UK customers add 17.5% VAT to TOTAL order amount. Minimum order £10. Bona Fide account orders accepted from

Universities and Local Authorities - minimum account order £50. Cheques over £100 are subject to 10 working days clearance. Carriage aan (C)=£8.50, (D)=£12.00, (E)=£15.00, (F)=£18.00, (G)=CALL. for ing - faster CALL.

nate pctions ws antic Chacperas reckons Ton CAS lovee cade ake notice. Orders subject to stock. Discounts for volume. Top CASH prices paid for surplus

Surplus always wanted for cash! 19" RACK CABINETS Superb quality 6 foot 40U

Virtually New, Ultra Smart Less than Half Price!

Top quality 19" rack cabinets made in UK by Optima Enclosures Ltd. Units feature designer, smoked acrylic lockable front door, full height lockable half louvered back door and removable side panels. Fully adjustable internal fixing struts, ready punched for any configuration of equipment mounting plus ready mounted integral 12 way 13 amp socket switched mains distribution strip make these racks some of the most versatile we have ever sold. Racks may be stacked side by side and therefore require only two side panels to stand singly or in bays Overall dimensions are: 77%" H x 32%" D x 22" W. Order as:

OPT Rack 1 Complete with removable side panels. £335.00 (G)

OPT Rack 2 Rack, Less side panels £225.00 (G)

32U - High Quality - All steel cabinet

Made by Eurocraft Enclosures Ltd to the highest possible spec, rack features all steel construction with removable side, front and back doors. Front and back doors are hinged for easy access and all are lockable with <% five secure 5 lever barrel locks. The front door & is constructed of double walled steel with a ES ‘designer style’ smoked acrylic front panel to enable status indicators to be seen through the # anel, yet remain unobtrusive. Internally the rack & eatures full slotted reinforced vertical fixing mem- § bers to take the heaviest of 19” rack equip- ment. The two movable vertical fixing struts (extras available) are pre punched for standard ‘cage nuts’. A mains distribution panel internal- ly mounted to the bottom rear, provides 8 IEC 3 # 5 pin Euro sockets and 1 x 13 amp 3 pin switched Rs +: utility socket. Overall ventilation is provided by “&& fully louvered back door and double skinned top section with top and side louvres. The top panel may be removed for fitting of integral fans to the sub plate etc. Other features include: fitted castors and floor levelers, prepunched utility panel at lower rear for cable / connector access etc. Supplied in excellent, slightly used condition with keys. Colour Royal biue. External dimensions 64” H x 25” D x 23%” W.

Sold at LESS than a third of makers price !! A superb buy at only £195.00

Over 1000 racks in all sizes 19" 22" & 24" 3 to 44 U. Available from stock !!

Call with your requirements.

The ultimate in ‘Touch Screen Technology’ made by the experts - MicroTouch - but sold at a price below cost !! System consists of a flat translucent ogee laminated panel measuring 29.5 x 23.5 cm connected to a PCB with on board sophisticated electronics. From the board comes a standard serial RS232 or TTL output. The out- put continuously gives simple serial data containing positional X & Y co-ordinates as to where a finger is touching the panel - as the fin- ger moves, the data instantly changes. The X & Y information is given at an incredible matrix resolution of 1024 x 1024 positions over the screen size !!! So, no position, however small fails detec- tion. A host of available translation software enables direct con- nection to a PC for a myriad of applications including: control pan- els, pointing devices, POS systems, controllers for the disabled or computer un-trained etc etc Imagine using your finger in ‘Windows’ instead of a mouse !! (a driver is indeed available !) The applica- tions for this amazing product are only limited by your imagina- tion!! Supplied as a complete system including Controller, Power Supply and Data at an incredible price of only: £1 45.00

RFE. Full Software Support Available - Fully Guaranteed . (B)


INTEL 'ABOVE' Memory Expansion Board. Full length PC-XT and PC-AT compatible card with 2 Mbytes of memory on board. Card is fully selectable for Expanded or Extended (286 processor and above) memory. Full data and driver disk supplied. In good used condition fully tested and guaranteed. Windows compatible. Order as: ABOVE CARD. £59.95(a1) Half length 8 bit memory upgrade cards for PC AT XT expands memory either 256k or 512k in 64k steps. May also be used to fill in RAM above 640k DOS limit. Complete with data.

Order as: XT RAM UG. 256k. £32.95 or 512k £38.95 (A1)

SIMM 1MB x9 SIMM 9 chip 120ns

ont £19.50 (A1 1 MB x9 SIMM 3 chip 80 ns £53.50 70ns £26.00 (A1 1MBx9 SIMM9chip80ns £22.50 70ns £28.00 (A1

4 MB 70ns 72 pin SIMM module only £125.00 (A1 SPECIAL INTEL 486-DX33 CPU £79.99 (A1)


EMERSON ACCUCARD UPS, brand new 8 Bit half length PC compatible card for all IBM XT/AT compatibles. Card provides DC power to all internal system components in the event of power sup- ply failure.The Accusaver software provided uses only 6k of base

AM and automatically copies all system, expanded and video memory to the hard disk in the event of loss of power. When power is returned the machine is returned to the exact status when the power failed !! The unit features full self diagnostics on boot and is

Normally £189.00 NOW! £69.00 or 2 for £120 @ - PACKED with bargains!


0181 679 4414

FAX 0181 679 1927

Govemment, Schools, (A)=£3.00, (A1)=£4.00, shipping Scotland All goods supplied to our

on a retum to base basis. All rights reserved to prices / specifications without prior rode, Al vedere eke act ontociged © Deaoiay Blocrerics 1008, EA OE 4

Everyday with Practical Electronics, September 1995

Build any one of six different projects on next month’s FREE P.C.B. Three projects will appear next month and three in the November issue.



Imagine an ordinary |.e.d. bargraph as a VU meter display. Now imagine it a hundred times larger, ten thousand times brighter, ten tungsten lights flashing, ascending, cascading, all in time with the music, and all driven from your normal hi-fi. It's all possible with the aid of the Ginormous VU Meter. Plus the power to impress your local ravers!


A cheap and cheerful capacitance ‘‘meter’’. There is often a need to measure or confirm the value of an “unknown” capacitor or one on which the lettering has become obscured. Certain components of dubious origin appear to have non-standard markings and this makes them difficult to match up if ever they need to be replaced. The circuit to be described is probably the simplest which can be constructed which will find the value of a capacitor with reasonable accuracy.

It will measure values from less than 10nF to 5000uF with an accuracy good enough to determine the nearest standard value of an “unknown” component.

You may not spot them, but electronic tags are attached to ever-increasing types of merchandise in most High Street stores and shops. The detection techniques used are ingenious, ranging from multiple r.f. transceiving to magnetic pattern matching and harmonic frequency analysis. Any commodity, whether it's clothing, garden tools, library books or videos, to name but a few, is likely to trap the would-be thief. Understand the detection principles as explained by an engineer from a major company which makes the equipment.




Everyday with Practical Electronics, September 1995


7 Teco: ROLL GUILE Lome, layout could not be easier" eh OPC

Electronics World & Wireless World Jan 1995 ‘file export & SpiceAge DDE link!

Quickroute 3.0 for Windows 3.1 has

| | been designed from the start to be Wo k 3 () Yaa EE as easy to use as possible, without Ouic r O ut 4 ® “Gm Sacrificing the power professional

Bae Engineers need to get the job done. , Ml Quickroute is available with Integrated Schematic and PCB (PT schematic capture, support for Design for Windows 3.1 me Ousses & power rails, 1-8 layer

@| auto-routing, SPICE file export, and jour new extended library pack. » Quickroute 3.0 PRO+ can also connect to the Windows simulation i Beaten . package SpiceAge using Windows newinrs aaa jas walaeae fox sooo va fess DDE. Contact POWERware for eee cae = feral lbae| : a

m more details! oa Pr il | ay ee ae a a8:

i Seolieses PR i ae .


utateteteetetetet Pttettetetettte ol Seteteteteetetetete eM etatetetete by eretatetetet OOO: | MERRRERRRERL EE” | ORME, tot) MEERRROOR RE. | MEARS RR ROR

*Schematic & PCB Drawing *1/2 layer auto-router *Supports Windows printers/plotters *Full set of libraries *Clipboard support *Designer Special (manual on disk) also available.

RT%e] 199

*Schematic & PCB Design *Schematic Capture *Integrated Rats-Nest Generation *1-8 layer Auto-router (faster than Designer) *Net-List Export *Supports ; o Windows printers/plotters *CAD-CAM outputs. Busses and Power rails handled easily UEiale Cl fe)ey-1my (-} melasma ai@re

Seceuy ee 33 bbbabeh) Att

TOL Tore | PPP > >>>P P>>D>Pi>>> = he S054 Bp

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ppp >> >> > p> >; LOT >>

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246) £299

As the PRO but also includes *Advanced Schematic Capture (Busses,Power rails,etc) *Larger Schematic & PCB Designs *Gerber file IMPORT for File Exchange *Extended libraries (CMOS,SMT,etc) *SPICE Export *SpiceAge DDE link.

*Prices exclude P+P and V.A.T. VISA/MasterCard Accepted *Network versions available.

DODDADDOW"*" * view Bwn-s—— Ao) + re m o

Quickroute Systems Ltd, 14 Ley Lane, Marple Bridge, Stockport, SK6 5DD, U.K.

Tel/Fax 0161 449 7101 DDE link to SpiceAge pastedtdl email Simulator with PRO+ vailabie.

664 t Everyday with Practical Electronics, September 1995


SYSTEM Evaluation Kits Programs 24, 28, 32 pin EPROMS, EE-PROMS, FLASH

Radio Data Modules

Data Transmitters & Receivers

_| and Emulators as standard, quickly, reliably and at low same Day DispatchE cost. 173MHz, 418MHz & 433.92MHz | Expandable to cover virtually any programmable part . : including serial E2, PALS, GALS, EPLD's and Credit Card Orders Ta @@ microcontrollers from all manufacturers. Applications: DESIGN | Remote Controls Not a plug in card but connects to the PC serial or 1 | Wire-free Security | parallel port; it comes complete with powerful yet easy as Remote Monitoring to control software, cable and manual. : RF Computer links SUPPORT UK design, manufacture and support. Same day : 5 dispatch, 12 month warranty. 10 day money back NEW! Transceiver evaluation kit. Includes: guarantee. , 2x Transceivers, test PCB with PIC micro, ASK FOR FREE INFORMATION PACK bit error rate, range & self test firmware : OG) o zs batteries, antenna and carry case. £149.00 MOP ELECTRONICS Ltd. | Aa ae Radio - Tech Limited Unit 2, Park Road Centre, Malmesbury, Wiltshire, SN16 OBX UK ‘T ~—-DISTRIBUTOR OF RADIOMETRIX PRODUCTS TEL. 01666 825146 FAX. 01666 825141 Overbridge House, Weald Hall Lane, Thornwood, Epping, Essex. CM16 6NB GERMANY 089/4602071; NORWAY 0702-17890; ITALY 02 92 10 3554 Sales 0181-368 8277 Fax 0181-361 3434, Admin 01992-576107 Fax 01992- -561994

FRANCE (1); IRELAND 1-2800395; SWEDEN 08-590-32185; Also from ELECTROSPEED UK


Bmuwe PA 400 *vPurier £1 39-99 Gite =


@ FREQUENCY RESPONSE 14H2z-26kH2z (3db)


@ DIMS 482mm/308mm/132mm 3U @ WEIGHT 8:4kg


P y :‘ 700 BEEFY ei socers ONLY £204: Ls soaks

W @ INPUT 0- ‘75V-1:2V VIA %" (6:-35mm) JACK SOCKETS RyCry se @ CHANNEL SEPARATION 85db a : P @ SIGNAL TO NOISE RATIO 100db ee UC @ FREQUENCY RESPONSE 20H2-30kHz sv @OUTPUT MAX 2 350W (4 ohms) VIA 3-PIN XLR FM L , @ OUTPUT RMS 2 x 230W iii i Ww @ SIZE 438mm (W) x 87mm (H) x 268mm (D) 2U @ WEIGHT 7. 65ke (3: 2She Booced UTILISES 8 TO3 MOSFETS WITH DUAL TOROID TRANSFORMER P.S.U.


(R) (C) 376 EDGWARE ROAD LONDON W21EB Tel: 0171-723 8432/0171-723 3462 Fax 0171-723 3467 2 mins. from Edqware Road Tube Station.

Everyday with Practical Electronics, September 1995 : , 665



No. 1 for Kits

Whether your requirement for surveillance equipment is amateur, professional or you are just fascinated by this unique area of electronics SUMA DESIGNS has a kit to fit the bill. We have been designing electronic surveillance equipment for over 12 years and you can be sure that all our kits are very well tried, tested and proven and