An Alarming Clock design Audio Mixer project

132 Pages·2016·20.07 MB·English

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MANSCENDENI PROM
Build it for a fraction of the cost of commercial units!
FOUP Circuit design features inside
How the Universe began?
An Alarming Clock design
Audio Mixer project
. .NEWS.. . .PROJECTS. . . .MICROPROCESSORS....AUDIO. . .
8K ON BOARD MEMORY! 2 MICROPROCESSORS
5K RAM 3K ROM or 4K RAM, 4K ROM Oink Z80 the powerful CPU with 158 instruction, including
selectable) Kit supplied with 3K RAM, 3K ROM. all 78 of the 8080. controls the MM57109 number
System expandable for up to 32K memory cruncher Functions include + , /, squares,
roots, logs,gxponentiab, trig functions, inverses etc
2 KEYBOARDS! Range 10' to 9 x 19 to 8 figures plus 2 exponent
56 Key alphanumeric keyboard for entering high level digits
language plus 16 key Hex pad for easy entry of
machine code
EFFICIENT OPERATION
Why waste valuable memory on sub routines for
GRAPHICS!
numeric processing' The number cruncher handles
64 character graphics option - includes everything internally,
transistor symbols, Only £18 20 extra,
MEMORY MAPPED
RESIDENT BASIC
high resolution VDU circuitry using discrete
TTL for extra flexibility. Has its own 2K with extended mathematical capability. Only
2K memory used but more powerful than
memory to give 32 lines for 64 characters most 8K Basics,
KANSAS CITY
1K MONITOR
low error rate tape interface.
resident in EPROM
PSI comp 80 SINGLE BOARD DESIGN
Z80 Based powerful Even keyboards and power supply
circuitry on the superb quality double
scientific computer sided plated through -hole PCB
design as published
in WIRELESS WORLD
COMPLETE KIT
NOW ONLY
Cabinet size 19.0"x15.7"x3.3".
Television not included in price. £225 + VAT
The kit for this outstandingly practical design by John
Adams published in a series of articles in Wireless World
really is complete. Included in the PSICOMP 80 scienc
tific computer kit is a professionally finished cabinet,
fibre -glass double sided, plated -through -hole printed
circuit board. 2 keyboards PCB mounted for ease of
construction, IC sockets, high reliability metal oxide
resistors, power supply using custom designed toroidal
transformer. 2K Basic and 1K monitor in EPROMS and,
of course, wire, nuts, bolts, etc.
KIT ALSO AVAILABLE AS SEPARATE PACKS
fir In. ree.mirl mN s1Y M y l.d their wails .r NM I p Iisil spills Ils ni is srmilmIls is
awls packs up PCI Ill" x 12 5"1 043.20. Pin NI kiribiiris C34 90 Firmsrirs is EPROMS CIO 00
Irinslersir n1 piwir nifty ism ..... tx EI7 SO C.li..l limy roma H. Iris
YweYlh losim11 EMSO P S Ill grsalli ..wc. tit mills hurl compiler isclilies OHIO
SUPERISITARD Ic whirl n cis Is r.alilt mishflid OtImr packs Ii.IM a sir FREE CATALOGUE
PSI COMP 80 Memory
Expansion System
Expansion u to 32K all inside the computer s own cabinet,
By carefully though out engineering a mother board with buffers and its
own power supply (powered by the computer s transformer) enables up to
3 8K RAM or 8K ROM boards to be fitted neatly inside the computer
cabinet Connections to the mother board from the main board expansion
,ocket is made via a ribbon cable
Mother board. Fibre glass douole sided plated through hole Panel s ze 9.0" X 5.25".Depth 12 2"
P C B 8 7" x 3 0" set of all components
including all brackets fixing parts and ribbon
cable with socket to connect to expansion plug 14 CHANNELS! 2 OSCILLATORS!
E39.90
8K Static Fibre glass double sided plated through hole NOISE GENERATOR! VOICED/UNVOICED
RAM board SPeCt Bof 5co 6m"p xo n4e 8nt"s including IC sockeEts1 2p.lu5g0 LED PPM METERS! DETECTOR!
and socket but excluding RAMs £11.20 SLEW RATE CONTROL!
7114L RAM 116 required/ £5.00
Complete set of board. components 16 RAMS COMPLETE KIT ONLY £195 + VAT
E89.50
8K Fibre glass double sided plated through hole
ROM board PCB 5 6" x 4 8" E12.40 Kit includes FREE foot control and test oscillator!
Set of components including IC sockets plug Like all our kits tie t 11 V KODER really is complete - fully finished metal work, professional quality
and socket but excluding ROMs E10.70 components 1311 resstors.2% metal oxide), nuts, bolts, etc - even a 13A plug!Kits also available as
2 708 ROM (8 required) £6.00 semrate packs - Sae ot.1 Free Catalogue.
orriponer Is 8 ROMs
£68.50
PHONE NO1 TV'
OUR IS FREE! RITE
PORTWAY INDUSTRIAL ESTATE ANDOVER
ANDOVER, HANTS SP1D 3NM (STD 0264) 64455
PRICE STABILITY: Order with confidence. Irrespective of any pri>it charges we SECUMICON DELIVERY: For this optiona service IU K mainland only) add (2.50
will honour all prices in this advertisement until January 31st, 1981, if If is mcnth's I'/AT rclusi-e) per kit
advertisement is mentioned with your order. Errors and VAT rate cha -vas excluded SALES COUNTER: If you prefer to collect kit from the factory, call at Sales Count
EXPORT ORDERS: No VAT. Postage cnarged at actual cost pius 11 -lend my and C pen 3 m 12 noon ,1-4 30p m Monday -Thursday
documentation
U.K. ORDERS. Subject to 15% surcharge for VAT. No charge is made for carnage, MANY MORE KIT
oral current rate if changed
1 dr nits
DECEMBER 1980 VOL 9 NO 12 11111111111110141
FEATURES
NEWS 11 Read all about it.
BANDPASS AND BEYOND 24 Switched capacitors and new IC filters
MICROBASICS 38 The ins and outs of hardware
AUDIOPHILE 48 Music to your ears (and hips)
TECH -TIPS 55 Over to you.
1111111111111111111=k61 SPOT DESIGNS 63 And various other places
ASTROLOGUE 65 Watch this space
Suede terra fraction of the oust of commerciat wets!
Circultdesise features inside THE BIG BANG THEORY 69 Fifteen billion BC and all that
Now the Universe beesn'T DESIGNER'S NOTEBOOK 79 VCO variations
An Alarming Gook design
Audio Mixer project
:NEWS .PROJECTS. . .MICROPROCCSS.l.WM
. .
Polyphonic synthesiser p.87
PROJECTS
FOUR INPUT MIXER 19 Cheap combinations
MUSICAL ALARM CLOCK 32 Tunes help you wake more easily
SOUND BOARD 44 Invasion effects
MUSICAL DOORBELL 60 For visiting musicians?
BENCH AMPLIFIER 74 Versatile low-cost design
POLYSYNTH 87 A project of note(s)
FOIL PATTERNS 125 Keep on tracking
Balancing ad p.19
INFORMATION
NEXT MONTH'S ETI 17 Competition issue
NEXT MONTH'S CT 41 Largest issue ever
BREADBOARD '80 85 Come and say hello
BOOK SERVICE 111 Out technical library
ETIPRINTS 124 Rub 'em down
EDITORIAL AND ADVERTISEMENT OFFICE
145 Charing Cross Road, London WC2H OEE. Telephone [phone]
Modules and melodies p.33
Ron Harris B.Sc. Editor
Ian Graham B.Sc. Assistant Editor OVERSEAS AUSTRALIA Roger Harrison
Tina Boylan Editorial Assistant EDITIONS CANADA - Halvor Moorshead
Paul Wilson -Patterson Group Art Editor and their GERMANY - Udo Wittig
Paul Edwards Drawing Office Manager EDITORS HOLLAND - Anton kriegsman
Ray Marston Project Editor
Christopher Surgenor Group Advertisement Manager
Member of the
Steven Rowe Advertisement Manager
ABC Audit Bureau
Roy Perryment Advertisement Representative
of Circulation
T.I. Connell Managing Director
PUBLISHED BY Modmags Ltd., 145 Charing Cross Road, WC 2
DISTRIBUTED BY Argus Distribution Ltd. (British Isles)
12-18 Paul Street, London
Gordon & Gotch Ltd. lOverseas
PRINTED BY QB Limited, Colchester
Covers printed by Alabaster Passmore
Electronic, locia \,is norrnalh published on the nest fridas, in the month preceding r er 0,1R- -1()1.) ,II) Platt worldvs tie
copyright protection All reasonable care is taken in the preparation of the magazine contents, but the publishers cannot be held legale, responsible for errors
Where mistakes do occur, a correction will normally be published as soon as possible afterwards All prices and data contained in advertisements are accepted by
us in good faith as correct at time of going to press. Neither the advertisers nor the publishers can be held responsible, however for artyvanations affecting price or
availability which may occur after the publication has closed for press _Subscription Rates. UK El° including postage Airmail and other rates upon application to
Pillar talk about hi-fi p.48 TI Subscnpoons Service. PO Box 35. Bridge Street Hemel Hempstead, Herts
ETI DECEMBER 1980 3
.S.,#,A?
The range grows
bigger... better...
New Profile Amplifiers- Two New
Series
MOSFET
CHOOSE AN I.L.P MOSFET POWER AMPwhen it is
01%
advantageous to have a faster slew rate, lower distortion at
higher frequencies, enhanced thermal stability, the ability 0 F 1K Hz LOAD. 8f1
to work with complex loads without difficulty and
complete absence of cross -over distortion. I.L.P's 3
exclusive encapsulation technique within fully adequate heatsinks has been taken a stage further with rn
specially developed computer -verified 'New Profile' extrusions. These ensure optimum operating
efficiency from our new MOSFETS, and are easier to mount. Connection is via five pins on the underside.
I.L.P MOSFETS ARE IDENTICAL IN PERFORMANCE TO THE COSTLIEST AMPLIFIERS IN THIS
EXCITING NEW CATEGORY BUT ARE ONLY A FRACTION OF PRICES CHARGED ELSEWHERE.
Output Distor- Signal/Noise DISTORTION CONTENT
Model Power tion Typical Slew Rate Rise Time Ratio Price & IS BELOW NOISE LEVEL
RMS at 1KHz DIN AUDIO VAT
MOS120 60W 0.005% 20V/us 3r4 100dB E25.88 POWER 0001%01W iw ow 100W 200W
into 4-811 + E 3.88 OUTPUT POWER
AMPS ARE
MOS200 120W 0.005% 20V/us 3us 100dB X33.46 Load impedance both models Input impedance both models 100111
into 4-8.11 + E 5 02 ENCRPSOLATE0 4ft -oo Input sensitivity both Frequency response both models
models 500mV 15Hz-1001-lz - 3dB
FOR MU
BIPOLAR CHOOSE AN I.L.P BIPOLAR POWER AMP 01%. F 1KHz
where power and price are first consideration while LOAD Eifi ON ALL
maintaining optimum performance with hi-fi quality STRBILIT1 IMD 411
and wide choice of models. From domestic hi-fi to
disco and P.A., for instrument amplification, there is
an I.L.P Bipolar to fill the bill, and as with our new Mosfets, we have encapsulated Bipolars within our New 1.0116ER LIFE
Profile extrusions with their computer -verified thermal efficiency and improved mounting shoulders.
Connections are simple, via five pins on he underside and with ou newest pre -amps artd power supply 0 0 01%.
units, it becomes easier than ever to have a system layout housed the way you want it.
Output Distor- Signal/Noise 'DISTORTION CONTENT
Model Power tion Typical Slew Rate Rise Time Ratio Price & IS BELOW NOISE LEVEL
RMS at 1KHz DIN AUDIO VAT
0 001%
Hy30 15W into 0.015% 15V/us 5ps 100dB E6.34 01w ,W 10W 100W 300W
4-841 + 95p OUTPUT POWER
Hy 60 30W into 0.015% 15V/us 51.1s 100dB E7.24 Load impedance all models 411 -oo Input impedance all models 100111
4-8ft + E 1 .09 nput sensitivity all models 500mV Frequency response all models
I SHz-SOKHz - 3dB
Hy 120 640-Wf- into 0.01% 15V/us Bps 100dB E 15.20 THE NEW PROFILE EXTRUSIONS
+ f 2.28 The introduction of standard heatsink extrusion for all
I.L.P power amplifiers achieves many advantages: -
HY200 1201N into 0.01% 15V/us 5ps 100dB E18.44 Research shows they provide optimum thermal
4-8.tt + E 2. 77 dissipation and stability. Slotted shoulders allow easy
"""--"^7:"tandardisation enables us to keep our prices
HY400 240W into 0.01% 15V/us 5ps 100dB E27.68 competitive. Surfaces are matt black, anodised for
4.0 +X4.15 lower thermal conductivity. Extrusions vary in size
according to module number.
NEW PRE -AMPS
HY6 (mono) and HY66 (stereo) are new to I.L.P's range of
advanced audio modules. Their improved characteristics
and styling ensure their being compatible with all I.L.P
power -amps both MOSFET and BIPOLAR, giving you chance
to get the best possible reproduction from your equipment.
HY6 and HY66 pre -amps are protected against short circuit
and wrong polarity. Full assembly instructions are provided.
Mounting boards are available as below.
Sizes - HY6 - 45 x 20 x 40 mm. HY66 - 90 x 20 x 40 mm.
SCHEMATIC BLOCK DIAGRAM
Active Tone Control circuits provide ±_12dB cut and boost. OF HY6 PRE AMP WITH
Inputs Sensitivity - Mag. PU. -3mV: Mic - selectable STEREO CONNECTION SHOWN
I-12mV: All others 100mV. Tape 0/P - 100mV: Main 0/P -
500mV: Frequency response - D.C. to 100KHz - 3dB.
DISTORTION TYPICALLY LATEST DESIGN HIGH
HY6 mono £5.60+84p VAT Connectors included 0.005% QUALITY CONNECTORS
HY66 stereo 10.60 £ 1.59 VAT Connectors included S/N RATIO - 90dB (May ONLY POTS, SWITCHES AND
B6 Mounting Board for one HY6 78p + 12p VAT P.U. - 68 dB) PLUGS/SOCKETS NEED ADDING
B66 Mounting Board for one HY66 99p + 15p VAT 38 dB overload margin en NEEDS ONLY UNREGULATED
Mag. P.U. POWER SUPPLY _4:15 to ±60v
NEW POWER SUPPLY UNITS
IN A RANGE
OF 11 MODELS
USING
LATEST TOROIDAL
TRANSFORMERS
Of the eleven power supply units which compnse our current range, nine have toroidal
transformers made in our own factory. Thus these I.L.P power supply units are space -saving, more
efficient and their better overall design helps enormously when assembly building. All models in 1971-1980
the range are compatible with all I.L.P amps and pre -amps with types to match whatever I.L.P
power amps you choose. TEN YEARS OF PLANNED
PSU30 -±15V at 100mA to drive up to 12 x HY6 or 6 x HY66 £4.50 + 0.68p VAT
PROGRESS
THE FOLLOWING WILL ALSO DRIVE I.L.P PRE -AMPS
PSU36 for use with 1 or 2 HY30's £8.10 + £1.22 VAT
ALL THE FOLLOWING USE TOROIDAL TRANSFORMERS When, in 1971,Ian L. Potts founded his now world-famous company,
he saw the need for a different and more rational approach to
PSU50 for use with 1 or 2 HY60's £9.75 + £1.46 VAT exploiting to the full, the potential that lay in modular construction.
PSU60 for use with 1 HY120 £9.75 + £1.46 VAT New thinking was badly needed. The result was a range of modules
PSU65 for use with 1 MOS120 £9.75 + £1.46 VAT revolutionary in concept. The rightness of this new thinking is shown
by the size of the company today, its new factory, its vast exports, its
PSU PSUTO for use with 1 or 2 HY120's £13.61 + £2.04 VAT acceptance by constructors as the modules to build with. The range
PSU75 for use with 1 or 2 MOS120 £13.61 + £2.04 VAT grows bigger and better. Exciting new lines (in no way conflicting
PSU90 for use with 1 HY200 £13.61 + £2.04 VAT with existing ones) are well past drawing board stage. This is why
I.L.P are simply ahead and staying there.
PSU95 for use with 1 MOS200 £14.75 + £2.21 VAT
PSU180 for use with 1 HY400 or 2 HY200 £23.02 + £3.45 VAT
QUIBBLE 5 YEAR GUARANTEE PSU185 for use with 1 or 2 MOS200 £24.20 + £3.63 VAT
NO
ON ALL ORDERS * Freepost facility BRITAIN'S FASTEST GROWING MODULE SUPPLIERS
7 -DAY DESPATCH When ordenng or writing about 1.L.P products, you do not need to stamp
MANUFACTURE the envelope. Mark it FREEPOST plus the code shown in the address
DESIGN AND below. We pay the postage for you.
BRITISH To: I.L.PELECTRONICS LTD. CANTERBURYCT2 7EP
SERVICE * TO ORDER Send cheque or money order payable to I.L.P Electronics Please supply
FREEPOST Ltd and crossed. Or pay by ACCESSor BARCLAYCARD. Cash payments must be
in registered envelope; if C.O.D. payment is wanted, please add fl.00 to TOTAL Total purchase price £
value of order.
I enclose Cheque E Postal OrderspInte motional Money Order [13
Please debit my Access/Barclaycard Account No.
IIP
ELECTRONICS LTD.
NAME
ADDRESS
FREEPOST 4 Graham Bell House, Roper Close, Canterbury, Kent CT2 7EP.
Telephone [phone] (Technical [phone] Telex 965780
Available also from MARSHALLS, WATFORD ELECTRONICS and certain other selected retailers Signature
to
WATFORD ELECTRO CS TRANS'ISTBCO18R2LS10 88EE115548 M25 MMJJEE334700 6704 T1I1P0112212 MIM. 225522990076 2M5 224N55747875 3465
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AC176 28 802121 10 6E182 38 MPF102 IS TIS44 45 243055 48
ALL DEVICES BRAND NEW, FULL SPEC. AND FULLY GUARANTEED. ORDERS AC187 28 BC213 10 BF1B4 38 MPF103 36 71545 45 2N3108 45 40313 130
DESPATCHED BY RETURN OF POST. TERMS OF BUSINESS. CASH/CHEQUE/ AC188 23 802131. 10 8E185 38 MPF104 36 T1546 45 243252 46 40315 GO
P.Os OR BANKERS DRAFT WITH ORDER. GOVERNMENT AND EDUCATIONAL ACY17 70 BC214 10 8E194 12 MPF105 TM59 50 2N3302 30 40316 es
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ETI DECEMBER 1980
IT'S AS EASY AS A,B,C...
WATFORD ELECTRONICS
COMPUTER CORNER
SUPERBOARD II Ready -built and tested STRINGY FLOPPY. Cornbt nes economy nl
Only E150 Cassette with speed & reliability of DISC (Ind 20
PSU 5V/3A Ifor above incl RE Modulator) £25 wafers) E169
26411,0 Expansion Boyd IBK R AMI expandabEle1 5to0 nKSeitOosF TdYire. cIntltye tlolig TeVn tD SePvRelOopM c Poproyg Braumrnm EePr RCOoEM,9.9,
CHALLANGER 1P (Superboerd cased with PSU) Ready-budt and tested E120
E1811 PSI I,,: atm, (Built) E20
Extra 4K RAM 1131)2114) cis UUHHFF M Moodudlualtaotrosr 8sM 6HMzHz 425800pp
Plastic Cosa Black. fits URIOI Superboard.
NASCOM II etc E25 KEYPADS .4.s matrix 350p
SUPERPRINT 500. 80 column Hugh Perfor Full ASCII nded 56 Key Keyboard Mod 756
mance Impact Printer Ideal for PET. NASCOM E40
UK 101. Superboard. TRS80 etc only E325
1V2IKD EleOve Sl IEI BNaILscE 1 b6aKs RedA Mon in TclR C5a8s0s eUttteo lDiseecsk Z80. I1P0&Px C1e2x tCrae omn ealnl tI.te. mRsa)c Ckall inat our sh£o5p.50 See us on STAND Fl at
E290 Demo or write In for leaflets LONDON BREADBOARD EXHIBITION
STSDDOWPPPSSGDITTTGTCLHEE' 2SA. 250334V424ppp S14IIP/AA L2pU A IoDDDS lDePEPHP D2 D D2S T-TT5wU0 acT yV/ToOveNr 11124534pppp RaWMBwbOaraaleeifTneya sASr ks3 tRSBopwYpe:4 i:ftS oc Mwrhheaa aD kfMtyPein a S4ygkTpo eA u, tW3sor s oalweiwtfmeanrybs r lyn6 upA1ltcmpc2ooa mlwye am,S y1wo2dit acwthea yAu1p1 2t4)o195)0' ,0(6)p-ppn AB EEfoXXrPP t h 63e50 0s0e FTriohoreu m sm ihcoorsobtp bwryoiidscete.l sy£s 5so.o7r l5dch bipresa. d£b3o.6a0rd in the UK;
4 pole on/off 54p DPDT Black Body Spacer and Screen 6p C EXP 600.6" centre channel makes this the
Red, Blue. Gm Yell ROTARY: (Adjustable Stop)
SSRRLM L Matocmhinegntary125p w1apyo 4le p zo l2e )t o2 1to2 3w awya.y 2p, 2 to 6 way 3 pole, 243p Microprocessor Breadboard. £6.30
SUE -MIN TOGGLE 125p ROTARY: Mains 250V AC 4 Amp 52p D EXP 4B An extra 4 bus -bars in one unit. £2.30
SP changeover 59p MINI. Non Loeking
SSDSPPPPSSODTTTT W o6cn eet ane/ogtdrsfe off 58774509pppp OPPuuIssLhh SBtorW eMaakIkTeCHE1255Spp 1S5wwaayyPlugs1 S935o5'pcIpTke CtsO C11N92oN58y.p9E,CT1O5R0-pS (Cannon type) E EpXinP I C32S5. £B1u.6ilt0 in bus -bars accepts 8,14,16 and up to 22
DPDT based 115p I49 S5 Pwp S;a T8y) w8a5yp 1165 pway 2357wwaayy 9980pp 238948pp 11875 pp F EtoX P3 x3 5104 2p7in0 D cIoPnSta. c£t3 p.1o5ints, ideal for working with up
C4150R50KKYHHSzzTALS338233 T638V.VR0AAA-6::N0 V6.S6 59F5.. O 050-AR.96 M556. 5E (1P-R2.C5S-A0B -(, 1M m92aVoVtu.t .,1n4 Pt04in0r i9gmmV)A 2-2.40A-2. 4102VV11-5 9305App ABWIOLTHUX LEMIDS. FPMSADENTEELRS G PfoBr6m P. r£o9fe.2s0si o(Nnaolt bilrluesatdrbaoteadrd.) in easily assembled kit
11M.0H0z8M 332935 112255-: 34A 5 155-1V .3 2A5 A4. 51V5V - 1-..235AA. 65-1.2A 6V -211.25Ap. 3x 7.r 55 6305xm4m6x H PB 100 Kit form breadboard recommended for students
1 28MHz 392 12V- 5A 125-.5A, 155..4A 15V.-.46: 20V. 3A 0-50eA
11 68MMHHzz 332233 22045V-.A3A: 65.1 5A 6C -1.5A. 952.13.63p6 ( 9305p.1 p 3&6p,) 404,1 7755 00--510000exAA and educational uses. £11.80 (Not illustrated.)
1 8432MHz 362 125.1A 125.1A, 155-.8A 155-.8A. 205..6A 4x2', ' 75 0-1mA
23..42577668MMHz 336223 2500VV-A 6: A65-4A 6V -4A, 95.2.5A 9352-02p.5 (A5,5 1p2 p5&-2pA). 18000 00--51r0nmAA & IT'S AS EASY AS 1,2,3 with THE EXPERIMENTOR SYSTEM
3.57954M 195 12V -2A, 15V -1.5A 15V -1.5A; 20V-1 2A 20V- 5)010" 107 0.50mA 1. EXP 300PC which includes one item. A matchboard
4.000MHz 290 2A. 255-1A 255-1A. 305..13A 305..8A 6)01.2" 110 0.100mA pre.drilled PCB - E1.32
44 .043323M61H9zM 313253 1100VA: 12V -4A 125.4k 153V6 5-3pA (6 105p5.311A9)... M7.5Ox2"'," 118855 00--15A00nrA SCRATCHBOARD 2 . EscXrPat 3ch02b owahridc hw ionrcklupdaedss t-hEre1e.6 i8tems. Three 50 -sheet
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78..06M80HMz 332932 VOLTAGE REGULATORS OPTO 44V5Up each The above prices do not include P&P and 15% VAT
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ETI DECERABER 1980
FREE CAR ENTERTAINMENT
BARGAINS
BURGLAR ALARM BOOKLET
Show us that you could have purchased for less within one month
of your purchase and we will refund the difference!
Our new FREE booklet entitled, 'Planning, Installing and Maintaining
Home Intruder Alarm Systems', gives advice on how to do just that. STEREO CASSETTE/RADIO.
MW and Stereo FM radio and Stereo
At Linton Electronics we do not assume that because you are concerned Cassette Player, 8 watts per channel, langen a on
lockable fast forward and autostop.
about Home Security you are automatically a leading authority on the Includes fitting kit and FREE ig
subject of Intruder Detection Equipment and Systems. SPEAKERS. Sold elsewhere for up
to £85 (believe it or not). OUR
PRICE £45 (+ £1.50 post). (For
Our new FREE booklet takes you step by step through the maze of all
negative earth cars only)
the different equipments available, explains their various functions,
advantages and disadvantages, and does it all in language you can 7 -CHANNEL STEREO
GRAPHIC EQUALISER/
understand. BOOSTER AMPLIFIER. 17 watts
R.M.S. per channel. Frequency res-
Our new FREE booklet also gives pointers as to how an intruder in your -1.0.--111111, WI Ye- .10 - VW, ponse 20Hz to 30,000Hz t 12d8
home might operate, so indicating how your Intruder Alarm System can cut/boost on each channel. Com-
plete with fitting kit. You would pay at
not only be effective, but cost effective too. least £45 elsewhere. OUR PRICE
.0 de. 119041, £26 (+ £1.20 post).
In short, our new FREE booklet has been written to give you confidence
in the system you install. As a mail order supplier of Intruder Alarm SUITABLE SPEAKERS FOR
EQUALISER. Adjustable angle,
Equipment we feel that that is important.
shelf -mounting, power handling 30
watts max. OUR PRICE £16 per pair
Write, or telephone our answering service NOW for your free booklet. (+ E1.20 post)
We will send your copy by return of post.
ELECTRIC ANTENNA. Wing
mounting, including switch and fit-
ting kit. OUR PRICE £10 (+ £1.20
4 HELSTON CLOSE, LINTON,
post).
BURTON ON TRENT, STAFFS.
PLEASE NOTE: These goods are ready built units. All goods
DE12 6PN guaranteed one year. 10 -day money back offer on all undamaged
goods. Goods ex -stock at time of going to press. Send SAE for
PHONE: BURTON [phone] details.
24 Hour Phone Answering Service MINIKITS ELECTRONICS LTD.
88D Hainault Road, Leytonstone, London El 1 1 EH
ACCESS ORDERS WELCOME
PORTABLE MAINS DISTRIBUTION - NEW WITH CIRCUIT BREAKERS
OLSON
New!
Slim Jim
Fitted with M.K. 10 amp C. B. - 13/A5 SW.CB £33.00 + post £1 + VAT1
Dim. 13/4" x 21/2" x 183/4"
£13.50 P&P £1 + VAT
31/2" x 19" Rack Mounting Type 13A/ 4SW/ R £21.50 P&P £1 + VAT 10 amp CB - 13A/4 SW.CB
£29.25 + post £1 + VAT
. I . TR6 -6 sockets switched £27.00
TR9 -9 sockets switched £32
4 feet LG. 30 amp total load Instant Trunking System for Wall or Bench Mounting Plus P&P £2 + VAT
NEW! 10 sockets switched in sloping box
MAINS
ISOLATING UNIT
The Olson mains
isolating unit is an es-
sential bench item for
Type 13A/10SW £33.00. P&P £2 + VAT
safety when testing and
-repairing mains -
COMPLETE WITH 6FT. CABLE
operated equipment.
AND 13 -AMP FUSED PLUG The isolating trans-
4 sockets 1 3A £16.00 former has an earthed
6 sockets 13A £18.75 screen and is rated
4 sockets 1 3A switched £18.50 250VA.
6 sockets 1 3A switched £21.50
+ Post £1 + VAT C38 P&P £2 + VAT
ALL DISTRIBUTION PANELS ARE FITTED WITH MK SOCKETS & PLUG OLSON ELECTRONICS LTD., FACTORY NO. 8, 5-7 LONG ST., LONDON E2 8HJ
Send for details of complete range TEL. [phone]
8 ETI DECEMBER 1980
VIDE01011E
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Fast becoming ore of the
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A MESSAGE
FROM VIDEOTONE
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This new range of Electronics from Videotone full brochures onany specific item you may be on to you. We have
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to a new high. cWoem cparerrhye onusti voeu rand we offerevery form o' financinpgacykoaug mesa ayr reequire.
30 watt amp MC input SA4130 £75.00 Money. We are coonwfnid esenrtvicing and are dedicatedto giving Value for
Stereo Tuner ST4120 £68.00 purchase with confidenceour products are unbeatable.You may
Cassette full features SC3200 £98.00 selected them fromcompetbiteivcea ussoeu rocuers E tnhgroinuegehrosuhtave specially
50 Watt amplifier WA7700 £77.00 wReem imempobret rt,h yeomu hdairveec t2ly1oduarysse ltvreiasl. I . I' the world and
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ETI 1280
ALL PRICES INCLUDE VAT
ETI DECEMBER 1980 9
TRANSCENDENT 2000
SINGLE BOARD SYNTHESIZER
Deigned by consultant Tim Orr (formerly synthesizer designer for EMS Ltd.) and featured
as a constructional article in ETI, this live performance synthesizer is a 3 octave instrument
transposable 2 octaves up or down giving sweep control, a noise generator and an ADSR
envelope shaper. There is also a slow oscillator, a new pitch detector. ADSR repeat.
sample and hold, and special circuitry with precision components to ensure tuning
stability amongst its many features.
The kit includes fully finished metalwork, fully assembled solid team cabinet, filter sweep
pedal, professional quality components (all resistors either 2% metal oxide or 1/2% metal
film), and it really is complete - right down to the last nut and bolt and last piece of wire!
There is even a 1 3A plug in the kit - you need buy absolutely no more parts before
plugging in and making great music! Virtually all the components are on the one
professional quality fibreglass PCB printed with component locations. All the controls
mount directly on the main board, all connections to the board are made with connector
plugs and construction is so simple it can be built in a few evenings by almost anyone
capable of neat soldering! When finished you will possess a synthesizer comparable in
performance and quality with ready -built units selling for many times the price.
Comprehensive handbook supplied with all complete kits! This fully describes
construction and tells you how to set up your synthesizer with nothing more elaborate
than a multi -meter and a pair of ears!
COMPLETE KIT ONLY
£168.50 + VAT!
Cabinet size 24.6" x 1 5.7" x 4.8" (rear) 3.4" (front)
NEW! TRANSCENDENT POLYSYNTH
EXPANA3g1310i0AYfiljOAIES6N ITAESIZER
THIS ISSUE!
COMPLETE KIT from £320 + VAT
By brilliant design work and the use of high technology components the
Polysynth brings to the reach of the home constructor a machine whose
versatility and range of sounds is matched only by ready -built equipment costing
thousands of pounds. This latest addition to the famous Transcendent family is a
4 octave (transposable over 7 octaves) polyphonic synthesizer with internally up
to 4 voices making it possible to play simultaneously up to 4 notes. An add-on
unit permits expansion up to 8 voices. Each voice is a complete synthesizer in
itself with 2 VC0s, 2 ADSRs, 1VCA and 1 VCF. Being voltage controlled all
voices can be adjusted simultaneously by master controls yet their own pitch
and gate signals mean each voice can be operated independently from the
keyboard.
Although using very advanced electronics the kit is mechanically very simple
with minimal wiring, most of which is with ribbon cable connectors. All controls
are PCB mounted and the voice boards plug into PCB mounted sockets. The kit
includes fully finished metalwork, solid teak cabinet, professional quality
components (resistors 2% metal oxide or 0.5% and 0.1% metal film), nuts,
bolts, etc. Complete kit with voice £320, 2 voices E368, 4 voices £464.
1
expansion unit to extend to B voices £275 (all prices subject to V.A.T.). A mere
fraction of what you would have to pay for a ready -built comparable instrument!
TRANSCENDENT DPX
MULTI -VOICE SYNTHESIZER
Another superb design by
synthesizer expert Tim Orr
published in
Electronics Today International
COMPLETE KIT
ONLY
£299 + VAT!
Cabinet size 36.3" x 15.0" x 5.0" (rear) 3.3" (front)
The Transcendent DPX is a really versatile 5 octave keyboard instrument. These are two audio outputs which can be used simultaneously. On the first thereis a beautiful harpsichord or reed
sound-fully polyphonic, i.e. you can play chords with as many notes as you like. On the second output there is a wide range of different voices, still fully polyphonic. It can -be a
straightforward piano as a honky tonk piano or even a mixture of the two! Alternatively you can play strings over the whole range of the keyboard or brass over the whole range of the
keyboard or should you prefer - strings on the top of the keyboard and brass as the lower end (the keyboard is electronically split after the first two octaves) or vice -versa or even a
combination of strings and brass sounds simultaneously. And on all voices you can switch in circuitry to make the keyboard touch sensitive! The harder you press down a key the louder it
sounds - just like an acoustic piano. The digitally controlled multiplexed system makes practical touch sensitivity with the complex dynamics law necessary for a highdegree of realism.
There is a master volume and tone control, a separate control for the brass sounds and also a vibrato circuit with variable depth control togetherwith a variable delay control so that the
vibrator comes in only after waiting a short time after the note is struck for even more realistic string sounds.
To add interest to the sounds and make them more natural there is a chorus/ensemble unit which is a complex phasing system using CCD (chargecoupled device) analogue delay lines. The
overall effect of this is similar to that of several acoustic instruments playing the same piece of music. The ensemble circuitry can be switched inwith either strong or mild effects.
As the system is based on digital circuitry digital data can be easily taken to and from a computer (for storing and playing back accompaniments with or without pitch or key change, computer
composing. etc., etc.).
Although the DPX is an advanced design using a very large amount of circuitry, much of it very sophisticated, the kit is mechanically extremely simplewith excellent access to all the circuit
boards which interconnect with multiway connectors, just four of which are removed to separate the keyboard circuitry and the panel circuitry from the main circuitry in the cabinet.
The kit includes fully finished metalwork, solid teak cabinet, professional quality components (all resistors 2% metal oxide), nuts, bolts, etc., even a 1 3A plug!
POEM MANY MORE KITS ON PAGE 115. MORE KITS AND ORDERING
INFORMATION ON INSIDE FRONT COVER
All projects on this page can be purchased as separate packs. e.g. PCBs, components sets, hardware sets. etc. See our free
catalogue for full details and prices.
10 ETI DECEMBER 1980