VOLTA 4555 PEAR GREEN User Manual

RECESS IO .S RADIO & _ CHART .owrtPa rt 1' 4i4 14 ói ói 414 ó4 t3) ói 6i4 4i4] 44 4 4401. b 9_0 T51 9, 1 óT° 4i jr -® ©1? ó1 ' 41

u S © E 0 T O S DIGITAL : CLOCKS : KITS : CALCULATORS "ALPHA ": 4 GREEN 5" HIGH DIGITS Alarm Alpha Module (excl. case) Kit 13.00

More than just a catalogue! ONLOI NC.Y.A.7. E P/P Just add transformer and switches) \1 \11,, Ai BRIGHT 4 OIGIT 0.5 INCH 7247. FLASHING COLON DHP / %

15 -120 Watts! The HY5 is a mono hybrid amplifier ideally suited for ail applications. All common input functions (mag. cartridge, tuner, etc.) are

EUI4ItJfltJEfflJ!s --(TRANSISTORS Type Price AC117K 1.31 AC126 0-11 AC126 0-14 AC127 P11 AC128 111 AC128K Odi AC141 11.18 AC141K N'M AC142 4.

EflflhI=C MUCT Limer /Cs Type Quant/fies Type Quantifies Type Quantities 1 25 100+ 1 25 100+ 1 25 100+ 72702 0.49 0 44 0.42 SL701 C 0.40 0-42

8.6629 -0 1,,d 57.2958' Ei 1 01 h10 2 -30259 r71e2e '; Scientif ic ^ 3-14159 LASKYS now offer this Sinclair Scientific Calculator for

WILMSLOW AUDIO THE Firm for speakers! SPEAKERS Baker Group 25, 3, 8 or 15 ohms Baker Group 35. 3, 8 or 15 ohms Baker Group 50/12 8 or 15 ohms Ba

R C ELIZABETHAN STEREO TUNER AMPLIFIER This compact Tuner Amplifier gives you full medium wave and V.H.F. coverage and FM stereo. With inputs for

PUSH BUTTON CAR RADIO KIT- 'Pali BUTTON CAR RIND +fl.0 5& p Easy to assemble construction kit comprising fully completed and tested pri

LYNX ELECTRONICS (LONDON) LTD NATIONAL CLOCK CHIPS MM5314 £375. MM5316 E525.a DIGITAL DISPLAYS & LED's 2 REO LED ONLY 13p DL707 99p D

SUPERSOUND 13 HI -FI MONO AMPLIFIER A superb solid state audio ampli- fier. Brand new omponents throughout. 5 silicon tran- sietore plus 2

I FIÍI1tI róGROVE KS. `É ISE ET[11S T.525. ADD SR VAT TO PRICES MARKED ADD 26UVAT TO ALL OTHER PRICES OR AS CURRENT VAT LEGISLATION. SEND C.W,O.(EXC

.41 9 MADE IT MYSELF" Imagine the thrill you'll feel ! Imagine how impressed \ people will be when they're hearing a programme on a

FROM BI-PRE-PAK Stîriit Sni products THANKS TO DEMAND AND STEPPED -UP PRODUCTION THIS HIGH -FIDELITY POWER AMPLIFIER MODULE SS.125 `9óßs £6.50 INCLUDI

ESSENTIAL BOOKS FOR RADIO AMATEURS 1976 Edition RSGB AMATEUR RADIO CALL BOOK Incorporates all new callsigns and amendments notified between Augus

These days you can Dial -a -Van, Dial -a- Recipe, Dial -a- Pop Tune, even Dial -a -Wine. But Home Radio Com- ponents Ltd. have been offering

&itkí - r ~ \ \w. Designed by TEXAS Featured by PRACTICAL WIRELESS SOLE U.K. DISTRIBUTORS - HENRY'S Build the Tex,an Stereo amplifier, then

NEW EDU -KIT MAJOR Total Building Costs £9.99 P& P+Ion. 65p. (Overseas Seamed P & P E3 60) Completely Solderless Electronic Construction

NEWS... NEWS... NEWS... SUBSCRIPTIONS - PRACTICAL WIRELESS AND TELEVISION MAGAZINES WE are still receiving numerous letters requesting subscriptions

NEWS... NEWS... RTTY news THE British Amateur Radio Teleprinter Group announced the start on 7th March, 1976, of its RTTY News Bulletin se

t3.47egao RQ GELLL47 ALS UAL F. G. RAYER THIS tuned RF amplifier will be found to provide quite substantial gain, and is of great help in bringin

* component list Resistors R1 68kí2 R2 270g) VR1 25kû Lin. potentiometer All resistors 1W 10% Capacitors C1 47pF C4 100nF C2 10nF C5 100pF C3 10nF V

PRACTICAL WIRELESS VOL. 52 NO. 1 ISSUE 831 MAY 1976 BRITAIN'S PREMIER MAGAZINE FOR THE DO -IT- YOURSELF RADIO AND ELECTRONICS CONSTRUCTOR EDI

A1 SK1 Cl A2 Sib Switch S1a/b /c Slc WIRING DETAILS Leads are run approximately as in Fig. 3. The tag - strip is raised on 12mm long bolts. As

TAKE 2 DAVID ANDREWS No. 74 SNAP MACHINE A series of simple transistor projects, using not more than twenty components. THERE have been lots of

® Break in strips Direction of strips Cathode S1 LEDI Battery connections for PP3 Component layout of the Veroboard panel and wiring to the sw

SPECIAL PRODUCT REPORT 5upEr Spurl( CAPACITY DISCHARGE IGNITION KIT BI- PRE-PAK IN case you do not feel like wading through this review to the very e

AF Signal Source W. MOONEY rapid decrease in the price of CMOS (4000 THE series) digital integrated circuits, and the amazing reduction in quiescent

Vdd +Q 14 13 n n 12 11 10 9 n n n n I I I u u u u u u u 1 2 3 4 5 6 7 FK159I Vss Fig. 2: Internal configuration of the CD4000. Gates

Fig. 4: PCB showing foil side to the left, and component overlay to the right. The board is shown full size. 4.5V when new. These small cells a

DOM" A PROFESSIONAL DEAL FOR AMATEURS `ORDERS BY RETURN OF POST "NO QUIBBLE REPLACEMENT PART SERVICE "QUALITY. BRANDED PRODUCTS &apo

TANGENTIAL BLOWER HEATER 240V 2KW can be switched for two speeds and 1KW Ro- bust and efficient. Ap- erture 71" x 11 " size overall

GOING BACK... 1970 60 `Hpfterp' ikettiber IHAVE received a letter from one of our younger Going Back enthusiasts -John Nar- borough, aged 16

CLEARANCE OFFER! PANEL METERS AT GREATLY REDUCED PRICES BAKELITE PANEL METERS -MODEL MR 65 Dimensions: Front 80mm x 80mm square Panel Hole: 65mm

Early morning maths While thumbing through my husband's PW (February), I noticed the Editors comments on digital watches. We have had a digi

NEW MULLARD & MAZDA VALVES All individually boxed and guaranteed. Full trade discounts to bona fide companies. Price and availability lists

tecknowledgey in consumer ICs - and their applications. SGS Audio ICs - -4, 1 Nave moved To accomodate expanded R & D facilities, AMBIT has mo

GI NE1tAI4 SERVICING An occasional series by LES LAWRY -JOHNS chatting this time on 3 -VALVE RADIOS VALVED radios are still great favourites with m

the fact that rectifier and output valves are well up the live mains end with only the dropper and per- haps the dial lamps (some designs)

mounted in a more inaccessible position. If the value cannot be read it can be assumed to be in the region of 100(1. If a printed panel is used,

valve toward cut -off and is therefore negative -going. The HT supply to the anode and screen is via a de- coupling resistor of some lki2 wi

on the grounds of economy. Some transformer sup- plied sets use a series chain of heaters but this is all a matter of design considerations. Som

NOSEY! Electronic noses have been around on the Amateur construction scene ever since suitable sensors became available. These, however, have foun

is3),vemiazit INNIXTMONTH'i - PRACTICAL WIRELESS i -rho . y DIGITAL FREQUENCY METER Start kHr Fr INK7 1s' 100ms 10m lms MN/ i>li RESET M

WATT DISCO SYSTEM LlK/r/oLi J e 50 WATT SPEAKER 1155155111111111111111111 TWIN URNTABLE ITH PRE -AMP. and POWER AMPLIFIER Complete with Ild SYSTEMS

og l 4,9 SPECIFICATION Output to external amplifier 500mV Number of rhythms 15 Number of percussion instruments 9 Tempo (useful range) 15 to 100

ENERATOR IASSIMINMONI A.S.WEBB B.Sc INSTRUMENTS Cl 52AA rthm arator 11 12 13 14 Bass drum (BD) High bongo (HB) Low bongo (LB) Maracas (MR)H S2 Short (

IAM04591 Clock Phase generator -2 divider 3640 bits ROM matrix Multiplexer Decoder 5 stage counter Output logic and driver 1- - - - -15 Rhythms Deco

CLOCK GENERATOR -e- - +5V RHYTHM GENERATOR IC WITH BINARY CODE SWITCHES N D1 1N914 102a 1/4 4011A 1 3 R1 22k¡> IC2b 1414011A 12 SK1 y-- {To foot

The Black Watch kit £14.95! * Practical -easily built by anyone in an evening's straightforward assembly. * Complete -right down to strap and bat

The Black Watch -using the unique Sinclair- designed state -of- the -art IC. The chip... The heart of the Black Watch is a unique IC designed by Sinc

* components list Resistors Semiconductors R1 22kS2 R38 27kû Tri BC108B R2 22kn R39 150kí2 Tr2 BC108B R3 100kû R40 68kí2 Tr3 BC108B R4 22kn

BASS DRUM BD input from C14 IC1 pin11 150nF R28 12k R3` 150k IC3d 1,44011A 4 VR4 500k + C1747nF R30 D7 27k 1N914 HIGH BONGO R39 1500 i4 4011A 11 VR5

changing to the Shuffle. To facilitate the exact setting of the tempo, control knobs of the type with a graduated skirt are recommended. The int

MORE THE FLASHER If it's escaped your attention, the LM3909 chip is well worth looking at if you need some form of flashing light.

vac PRE AMPLIFIERS TRANSISTOR UNIVERSAL AMPLIFICATION CO. LTD. 163 MITCHAM RD. LONDON SW17 9PG 01- 6723137/9080 MONO DISCO MIXER WITH AUTO FADE TUAC

PIU)1)iJ(;'l'IOAT LINES colin riches ITT SOUNDERS ITT are marketing a range of piezo ceramic sounders. The smaller ones shown in the pi

ADC ACCUTRAC A unique electronic turntable -the "Accutrac " -operated by remote control -has been introduced by Audio Dynamics Corporation,

SPECIAL PRODUCT REPORT -continued from page 31 adjacent to the coil, keeping the connecting leads as short as possible, thinking that these new

How to get a reputation overnight for making Hi Fi equipment as good as ours. To be perfectly honest, it's not that difficult. Simply go out and

Battery Economy h B.B.RAFTER Transistor Radios SME of those hardest hit by the general heavy OME in dry battery prices over the last few . year

'SPECIALIST' RANGE 5 Models for 5 purposes / Illust. Model DISCO 60 All have ROBUST CAST ALUMINIUM CHASSIS and EXTRA HIGH POWER COILS. OUT

GREENWELD 443 Millbrook Road Southampton SO1 OHX Tel:(0703) 772501 All mall order and callers to this address please -callers only to 21 Deptf

EDITORIAL ANNOUNCEMENT PRACTICAL WIRELESS P C B SERVICE FOR READERS Our new PCB service is well under way and we are now able to add PCBs for two pop

Peter HEMINGWAY T HIS device was designed as a result of reading an article in PW some 3 years ago (Logiprobe, by L. Cook, October 1972). The d

it-- ì.=* Build an oscilloscope. As the first stage of your training, you actually build your own Cathode ray oscilloscope! This is no toy, but a

FUZZ LIGHTS TUAC r,"nv..' ,h, ., ,_r :_ ! - ,ON1C AN:, AMP. fICA- :pN . . - Ei%ulPMlN . Pi NtiOtvAL SHOPPCf, S,MON ' 5 'fl

Dolby TM Noise Reducer Kit PRICE: £3440 + VAT 'Wireless World' May, June, July '75 Trademark of Dolby Laboratories Inc. Tho latest ad

r--, D } L 11 W Number 58 Motorola MC1312P Quadraphonic decoder THE Motorola MC1312P and MC1313P are 14 -pin dual -in -line devices which have be

loudspeakers. Similarly, the total left hand signal is separated to produce two audio output signals at pin 2 (LB) and at pin 3 (LB). The imped

ELECTROflK DKITAL CLOCK with alarm and snooze feQIUII*I Features: 0.7 INCH HIGH DIGITS VARIABLE INTENSITY 24 HOUR ALARM 5 MINUTE REPEATING, SNOOZE

Wire Wound Resistors. Our selection of mixed valves. 30 for £1 40. 100 for £3 50. Audio Amplifier Module. Mullard LP1173. Output nominal 10 wat

by Eric Dowdeswell G4AR IT has always amazed me to realise that the act of sitting down and taking a written examination, successfully, should enable

Allen A8677 was pleased with the improved results from using a 132ft wire and found ZL3NR /C on 80m, which can't be bad! A most interesting l

CRESCENT RADIO I1 -15 & 17 MAYES ROAD, LONDON (also) 13 SOUTH MALL, EDMONTON, MAIL ORDER DEPT. I ST. MICHAELS TERRACE, WOOD LONDON N22

CODAR AERIAL TUNER UNIT * R.Q.80 This new CODAR A.T.U. tunes I -5 -30MHz and is designed to match random length single wire aerials from a few

to Lara Venezuela on 4800 at 0220, Juventud Venezuela on 4900 at 0050, Barquisimeto Venezuela on 4990 at 0135. These were all pulled in on Dave

TRANSFORMERS ALL EX- STOCK -SAME DAY DESPATCH MAINS ISOLATING PRI. 120/240V SEC. 120 /240 CENTRE TAP WITH SCREEN Ref. VA (Watts) £ 07 20 3.97 49 60

This is a very useful book for the beginner. A similar publication "World Radio TV Listings" is available for 60p. The Foreign

Greenbank Electronics Established 1970 The illustration shows the two P.C.B. module kits already assembled, one has 8mm high digits, the other ha

RETURN OF POST MAIL -ORDER SERVICE JUST RELEASED BAKER MA OR 12" í1 1 50 BAKER DISCO SPEAKERS 1 HIGH QUALITY- BRITISH MADE R.C.S. 100 watt V

BE BAMBER ELECTRONICS Dept PIN, 5 STATION ROAD, LITTLEPORT, CAMBS., CB6 10E Telephone: ELY (0353) 860185 (2 lines) Tuesday to Saturday PLEASE ADD

SpNedlita rn!2 Capacitive discharge electronic ignition I I onition Changeover switches O E4.30 4. R.P.M. Limit systems in above units E2.42 11.11

arcla TECHNOLOGICAL PRECISION PRODUCTS ELECTRONICS The NEWEST from NOVUS -the 4525 PROGRAMMABLE SCIENTIST The NEW 100 Step Programmable Scientific C

SPECIAL OFFER 1N4148 SWITCHING DIODES 10 For 30p 50 for £1.25 100 For £1.501000 for £10 LIMITED OFFER BC107 - BC108 - BC109 9p each 100 for £7.50

CONTROL DRILL SPEEDS DRILL CONTROLLER Electronically change. speed from approxl mately 10 rev.. to maximum. Full power at All speed. by fingertip c

`VAT INCLUSIVE PRICES RCA, TEXAS, MOTOROLA, Add 20p P 6 P -No other extras MULLARD, etc. TTLs by TEXAS 7400 13p 7484 103p 74H00 20p 7485 130p 7401

SINCLAIR IC20 IC20 10W + 10W stereo IC amplifier kit with free booklet and printed circuit 16-95. PS20 Power supply kit for the above £495. V

SAXON ENTERTAINMENTS LTD . wiiiruiuii professional standards realistic prices SAI208D -120 WATTS RMS POWER AMP Uses 150W I6A RCA devices - ~"

Do it in your spare time. And enjoy it. And, perhaps, you'll save yourself some money. The secret is to be practical about the way you spen

Practical Wireless Classified Advertisements The pre -paid rate for classified advertisements is 14p per word (minimum 12 words), box number

BRAND NEW COMPONENTS BY RETURN: Electrolytics -16V, 25V, 50V -0.47, 1 0, 2 2, 4 7, 10 mfds.- 5p. 22, 47 -511 p. (50V-6p) 100- 7p (50V -8p)

Miscellaneous BUILD fp TREASURE TRACER THE MK III Metal locator Vàr,cap tuning Britain's best selling metal locator kit; 4,000 sold Weighs on

BUILD YOUR OWN You are invited to send S.A.E. for lists of our very extensive range of high quality amplifier, pre -amps, F.M. tuners, instrument

U.S.A. Govt. Electronics Engr. (retd.), W70E claims "VFA 5ft below ground, same as dipole, elevated 15ft., one "S" point UP on

WATFORD ELECTRONICS 33j35, CARDIFF ROAD, WATFORD HERTS, ENGLAND MAIL ORDER, CALLERS WELCOME. Tel. Watford 37774 ALL DEVICES BRAND NEW AND FULLY G

WATFORD ELECTRONICS (Continued from other side) :HOKE vliniature o0m', 7Jp FOOT SWITCH +Pedal £2.80 Connectors Snap on PP3 6p Snap on PP9 91, JAC

Head Office and Warehouse Z & I 44A WESTOOURNE GROVE LONDON W2 SSF Tel: 727 56411213 Please 85 TOTTENHAM COURT ROAD AERO SERVICES LTD 85 LON

IT Tpp JL ß m o I_ L Dept. ». 56, Fortis Green Road, electronics Muswell Hill, London, Ni0 3HN. telephone: 01 -883 3705 ( C - MOS Q 24 CD4000AE