Guitar practice amp

148 Pages·2017·14.49 MB·English

Jan 1980
ELECTRONICS.
51p
56°
TODAY
INTERNATIONAL
Build:
Guitar practice amp
I
Car fuel level
warning
lHi-Z interface
for 60 amp
CA]
Linear -scale
I
,e
ohmeter
A
theme computers
&',peripherals
-market.. survey
r
'I' 4 52
I
IN PUT 2 INPUT I
PRE AMP OUT
POWER
011 MAINS
guitar practice amp
Great Sound Secsi
:
I
-
Multi -track recording at home Nakamichi cassette deck reviewed
A new dynamic generation of
Maxell topes.
When Maxell announces an improvement in the quality of its
tape, you can bet the improvement has to be pretty dynamic. In fact,
we think our new generation has even gone beyond our own standards
of superior sound reproduction. -
Take our high level (Cr02) position tape the UD-XL II.
Maxell engineers have succeeded in expanding its dynamic range in the
middle -low frequency range by dB, while also pushing its sensitivity
1
by 1 dB in the high frequen-c y range. Then look at our normal position
UD-XL I, UD and LN tapes our engineers expanded the dynamic range
at all frequency points, while also boosting output in the high frequency
range. The new dynamic range, of course, allows for better music
reproduction even for LN-type tapes.
On the UD-XL I and II, we also added an exclusive shell
stabilizer for significantly improved tape running and track p-o sitioning.
One thing hasn't changed on all Maxell tapes our functional
features like 4 -function leader tape, replaceable index -la bels for UD-XL
series tapes and Maxell's through -production system your guarantee of
quality and superior sound reproduction.
Tape selector position UD-XL I, UD, LN: Normal position (Normal bias/120 Nsec. EQ)
UD-XL II: High level position (High level bias/70 Nsec. EQ)
maxell C90 rmaxellffi.csb
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maxell ° t , C90 rallo" Maxell afg ;C90 Se1f11'..\41/
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UD
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ULTRA -DYNAMIC ULOLTWR -AN OISE
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` 111111101 11I11I11 11111 Ill I*( N I I I 111,11111111111111-11.
I 11101, I
For de ails on all Maxell Recording Tape write to Available time length UD-XL I: 60, 90 min./UD-XL II: 60, 90 min.
Maxell Advisory Service, P.O. Box 307, North Ryde, N.S.W. 2113 UD: 60, 90, 120 min./LN: 60, 90, 120 min.
maxell®
Distributed by...
HAGEMEYER
simply excellent
WT126/79 -
L`
-
Registered for posting as a publication
Category B
ELECTRONICS

TODAY
INTERNATIONAL
QUICK INDEX
FEATURES: PROJECT SECTION:
16 Courses and Careers in Electronics 47 452: Guitar Practice Amp
29 Jupiter Revisited 53 321: Fuel Level Alarm
36 Computer Market Survey 59 151: Linear Scale Ohmmeter
41 Computer Peripherals Guide 64 474: Interface for the 470 60 W Amp.Module
SOUND SECTION: 69 A Little Light on LEDs
108 Introduction to Multitrack Recording 73 Ideas for Experimenters
122 Loudspeaker Design, Principles and Problems 77 Kits for Projects
138 Nakamichi 480 Cassette Deck Review 79 Shoparound
142 Crown "Self -analysing" Amp. Review 82 Software for the ETI-643 EPROM Programmer
WELL, THERE WENT THE '70s. The last decade saw a whole host of new technologies arise in electronics.
Like CMOS, I2L-, microprocessors, VFETs, bubble memories and more. The next decade shows just as
much promise it looks like an exciting time!
In researching this month's lead feature, Courses and Career-s in Electronics, we were almost engulfed by
the enormous diversity of courses offered around the country at all levels, from trade to professional.
Now, diversity in education is undoubtedly a good thing, and certainly all th-e courses offered
would not survive if there were too few students to pay fees, but, we asked where does
the 'product' of those courses end up ? Predominantly, the public service (State and
Federal). With little a further enquiry, we found out that most courses, particularly
the middle- level (or certificate) courses (which train the bulk of qualified :aiR.
electronics personnel)are geared largely towards producing qualifications to meet -':
public service requirements. Those people who sit on the various standing committees -: :.-,.A
to approve courses and examinations, those in the different State councils for Technical
Education, even the State Industrial Training Commissions, appear to have blinkered
vision. Relatively few members of these august bodies come from industry, apparently.
The whole business seems an incestuous hotchpotch where one bureaucracy is
established to perpetuate another.
Industry, it seems, takes the cream- of the education institutions' product while
'sneering' at qualifications generally but perhaps, not without some justification.
Isn't it time industry increased their meagre input to education ? It's in their
interest. Isn't it time that the education heirarchy sought more input from industry ? r
Do readers have any comments or observations ? We'd like to hear your views. 1
II'..
S,
Roger Harrison, Editor
-3
ETI January 1980
advertisers
e
ELECTRONICS
A
TODAY
INTERNATIONAL
Adaptive Electronics 127
Adcola 101
AED 88 eti .......s.o
Ampec Engineering 72 ELECTRONICS
AApnpdleiersdo nT eDcihgnitoallo gy 18310 TODAY
Arena Distributors 120 INTERNATIONAL
Ashpoint 98
Audio Engineers 107 features
Audio Reflex 126
Audioson 98
AWA 114
Barrett Lighting 28
Bright Star Crystals 96
Byte Shop 85 -scale COURSES AND CAREERS
CCaaluclufilealtdo rT eScuhp ermarket 3242 altlpt:tn IN ELECTRONICS 16
Christie Rand 66 Looking for something to do with your
Colin Walt 112 penphen" life? Here's a guide as to how to get into
Collingwood Tech 20 -market surrey an electronics career.
Concept Audio 132-133 1;11110:t
Contemp. Sound Centre 102
Convoy 141 110
Danish HI -Fl 103 4/
David Reid 56
Defence Recruiting 19,21
Deisound 145 .
Dick Smith. . 24,26,27,32,50,62,85,105 Mrtklrac4 recardmp at home aaa.nnirLi cassette ded rerMaad
Dlggerman Eelctronics 63
Edible Electronics 45
EElieeccttrrooncirca fAt gencies 9968 COVER
Electronic Circuit 90 Chris Masuak of Sydney band The Hitmen,
Electronic Concepts 42
Ellistronlcs 38 accompanied by Lyn Phillips, tried out our
Emona Enterprises 90 Guitar Practice Amplifier. Our studio was
GHHaaLgWnelm meexy er 2,1488975 fciollmedp owseitdh amnaortvheelrlo ubse asuotuifnudls caosv eIvr yf oHr anysoeun. JUPITER REVISITED 29
HF Coates 80 Last June we published a report on the
HHH(m oitRaaldorckewh nei W&a sCpo 127414266 Vbwiogityghae gsJteu prp lia1t eneren tc.l aoVtueonr yteianrg ewthri et2h yhtehaaedr sa-onl aehrn escryeos'uste ntmthe'esr
Insound 145 report.
Jaycar 57
JJJRowh CnH oaFmy mRpeoossn ee nts 418520 news SMALL COMPUTERS
KLaetnreolbeec Uni 6264 MARKET GUIDE 36
Leisure Sound 145 If you're looking around for a small machine
Logic Shop 18 for your business, or you're just an ambitious
MMMMaa&icgyGrlroaa ntHPhdorssos kBDiunesss. igMna chines 10296207 NAdeuEvsWetrloaSpl iamD eItGnot E; BSgeeTOt -o wqnu esstiaotnesll itine ;t hFeu heol uscee!8l;l hmoabcbhyinisets, . here's a market guide to available
PNeatetirosnoanl PSapneaaskoenr iLc abs 11448 Atiomni daonnd mtoorroei,d sa;l reSacdieyn. ce Industry Associa- GUIDE TO PERIPHERALS 41
PPhleislispesy . C' omponents 12810 Oalnmcoes t yoceur'vtaein fotou ndne eydo ua r feswys tepmer,i phyeorua'rlse.
Pre Pak 67
RRRRaaMalddmIiiTooa rDP aAersgtspe antcciehs 54522605 6P"H8R0o9ImN beTo OacrUdo;nT Mt roolle" x fkroemyp adhso; mReu mcoomurpsu.t.e 8r. s7;. projects
Rod Irving 58
Rose Music 137
School of 'Electronics 10
Semcon 78 COMMUNICATIONS NEWS 91
SSSSTMayotosnn ttydeEts yml e sCc toArrorunetisocpmso nadtieonnc e 841,8423154508 CsMNuheapawrpcn lhny2 .em l l auahnlelc -amhr do dfeoi nr traPVnhiesacnseen iav;e Irl;l l-cAQo muaO dS phCouvA'bvResr;; 1iT14R2 r.,..--, r-»l. ib
Tasman 68 o a. taxer
TDK Aust 113
Teac 124-125
Texas Instruments 76 SHORTWAVE LODGINGS 94 452: GUITAR PRACTICE AMP. 47
WZVVeiiicdrllooies mo O T Cnrelaa dsisnicgs 199806364 DCJinahX pMa anenogl nbe soe uxthprneaee tr i.am irRe; natdsBi oe clgoiMunmtoinz auimne ;b tiwqDuoXe e;v ras rRiematiedeeisot; HsC7Wtooilm wl o puattkoc.e t e, ppu stt rpaineig achloetfn ogrw whiatohrud r,s t htowef o pnrinaecipgtuhictbseo uaarnnsdd)
-
4 January 1980 ETI
next month
ti,A,, . J
321: FUEL LEVEL ALARM 53 LOUDSPEAKER DESIGN 122 ,i
\-
Ever felt like a right berk when your car David Tilbrook takes you through the T1.2> !
coughed to a stop at an embalrasing spot? principles and problems encountered in :*o -,-N, 1
No need to get caught now. This project loudspeaker design.
is the first in a series on "updating your
car electronically". TURNTABLE OFFER 128
Two Elac turntables at extraordinary
O15H1M: MLIENTEEARR SCALE 59 pNriAceKs.A MICHI 480 3Yhi0ogu0h Wapso kweAdeM rf oParmL iItpF li-IfEi ehRr.e reMT hiOits DcomUmoLedsEu l eI ! Ac orenatilnly-
Another in our series of low cost test CASSETTE DECK 138 ues the tradition so firmly established by
instruments, this one has good accuracy Mr Nakamichi you've done it again! our long-lived 480 power amp modules.
and a wide range of applications.
SERIES 4000 4 -WAY LOUDSPEAKER
474: HIGH-TO LOW-Z INTERFACE CROWN SELF-ANALYSING Continuing our line of quality hi-fi projects,
AMPLIFIER 142 this 4 -way speaker system is the 'flagship'
FOR THE 470 60W MODULE 64 Crown are well known in professional of a series of loudspeakers designed by
This project enables you to use our popular circles. This addition to their range lives up David Tilbrook and developed in our own
60W low TID amp modules with many to the Crown reputation. laboratory.
existing preamps.
PIONEER TO SATURN
REEL-TO-REEL TAPE OFFER 111 The spectacular results of Pioneer 11's
643: EPROM PROGRAMMER
mission to this fascinating planet are disc-
SOFTWARE 82 ussed by our European correspondent,
Software for last month's EPROM Prog- Brian Dance.
rammer, to suit 2708s. general Quartz- Locked PLL Speed Servo
KITS FOR PROJECTS 77 PMASE LOCKED LOOP SERVO
sound a.qr.l1 LMpMN ' Smneeergcvloio o ,
ETI SERVICES 6 11::41:111 cMoPgn...s...et a K M
LETTERS 15
SOUND NEWS 117 L<»:c RPM FMP
Philips' Series 80; Books from Butterworths; LAB NOTES 69
MC cartridge from Audio-Technica; An A down-to-earth article on LED uses and IV= 0-n-.Pla
affordable Accuphase amp; Change to CE abuses plus a host of useful indicator and lo mola .P.bl Rola
Show; Piezo tweeters. display circuits.
tarri,r,,,rEynlrrrrrm" "MY wt1M.I'-11_,In IDEAS FOR EXPERIMENTERS 73 Maa oo+
~ arw'hry
r
01'4 SHOPAROUND 79 TURNTABLE TECHNOLOGY
44 1
Designers have been paying a lot of attent-
IONOSPHERIC PREDICTIONS 97 ion to the turntable system in recent years
.
and some remarkable technology is appear-
- MINI-MART 100 ing as a result.
-^-
R1171-7--- -f-
I MORE
'bs'r -" BOOK REVIEWS 104
, 17r.' t IP-rR- R _- DREGS 146 "wUitphd aante ovyeoru - recva ar laermle cptrroojneiccta, llpylu" sp wroec°eheadvse
a further project in our low-cost test inst-
rument series . . . not to mention the
regular features. An issue not to be missed.
INTRODUCTION TO
Although these articles are in an advanced
MULTITRACK RECORDING 108 state of preparation, circumstances may
Many bands and small groups have got Into affect the final ncontent. However, wé will
multitrack recording in home studios make every attempt to include all features
recently. You too can get in on the act. mentioned here.
-5
ETI January 1980
Electronics Today international is published by Modern Magazines (Hold-
ings) Ltd, 15 Boundary St, Rushcutters Bay, NSW 2011. It is printed '(in
1979) by Wilke E. Co, Browns Rd, Clayton, Victoria and distributed by
Editor Australian Consolidated Press. Recommended retail price only.
Roger Harrison VK2ZTB Eli subscriptions cost $19.00 per ye-ar (inc. postage) within Australia.
Project Manager Cost elsewhere is $24.50 (inc. postage surface mail). Airmail rates on
Phil Wait VK2ZZQ application.
Photostats are available of any article ever published by ETI. We charge
Editorial Staff
a flat $2.00, regardless of page quantity, from any one issue of ETI. Thus, if
Roberta Kennedy the article is in three issues the cost is $6.00. Send orders to the address
Jonathan Scott VK2YBN below. The charge includes postage.
Back issues: cost $1.40 each plus 45 cents post and packing. We can
David Tilbrook VK2YMI
supply only the following issues:
Jan Vernon
1976: Nov Dec
1977: April May June July Aug Sept Oct Nov Dec
Art Direction and 1978: Jan Feb Mar April May June July Aug Sept Oct Nov Dec
technical photography 1979: all to date
Ivy Hansen Binders available for $4.50 plus 90 cents .post NSW, $2.other.states.
Orders to: Subscriptions Department, ETI 3rd Floor,
Layout/ Assembly 15 Boundary Street RUSHCUTI'ERS BAY, 2011 NSW
Bill Crump
READER ENQUIRIES
JRaena dCero Slleinrvsi ces Badyd rMesasiel:d Tehnevreel oips e nmo ucshta rbgee e fnocrl orseepdli.e Qs ubeurite sa rfeoloaltsincga pto -s ipzero jsetcatms pceadn
Managing Editor only be answered if related to the item as published. We cannot advise on
Collyn Rivers modifications to projects, other than errata or addenda, nor if a project has
been modified or if components are otherwise than specified. We try to
answer letters as soon as possible. Difficult questions may take time to
Advertising (Sydney)
answer.
Bob Taylor (Manager) By phone: We can only answer readers technical enquiries by 'telephone
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please ask for the "Subscriptions Department". 33-4282
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Production Manager Microfiche editions of this publication are available by annual subscription
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COPYRIGHT
Subscriptions & Circulation
John Oxenford The contents of Electronics Today international and associated publications is fully pro-
tected by the Commonwealth Copyright Act (1968).
Acoustical Consultants Copyright extends to all written material, photographs, drawings, circuit diagrams and
Louis Challis & Associates pcorinncteedrn ceirdc uaibt obuota ridnsd.i vAildthuoaulsg hc oannsyt rfuocrmtin go f rperopjreocdtus cftoior nt ihse air b orewanc hp orivf actoep yursigeh, tn, owre bayre pnoopt
groups (for example) constructing one or more items for use in connection with their
Editorial -Advertising Offices performances.
Sydney Melbourne Commercial organisations should note that no project or part project described In
3rd Floor, 150 Lonsdaie St Electronics Today International or associated publications may be offered for sale, or sold, in
15 Boundary St 2011 Melbourne, Vic 3000 substantially or fully assembled form, unless a licence has been specifically obtained so to do
Rushcutters Bay Phone: [phone] from the publishers, Modem Magazines (Holdings) Ltd or from the copyright holders.
Phone: 33-4282 Telex: AA 34340
Liability:
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Adelaide Hobart Comments and test results on equipment reviewed refer to the particular item submitted for
Admedia Group H.W. Uncone review and may not necessarily pertain to other units of the same make or model number.
24 Kensington Rd 23 Lord St Whilst every effort has been made to ensure that all constructional projects referred to in this
Rose Park SA 5067 Sandy Bay Tas. 7005 edition will operate as indicated efficiently and properly and that all necessary components to
Phone: [phone] manufacture the same will be available no responsibility whatsoever is accepted in respect of
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Geoff Home Aubrey Barker fault In design or otherwise and no responsibility is accepted for the failure to obtain any
57 O'Connell ice 133 St George's Tce components parts in respect of any such project Further, no responsibility is accepted in
Bowen Hills QLD 4006 Perth WA 6000 respect of any injury or damage caused by any fault in the design of any such project as
Phone: 52-8566 Phone: [phone] aforesaid.
-
6 January 1980 ETI
FOR ALL YOUR ELECTRONIC COMPONENTS
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IN THE HEART OF MELBOURNE
s0OPE MARK MAGN/cj9
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with these benefits indispensable to professionals
Designers and printers Connoisseurs of jewels
To check colour balance, alignment of With easy focusing control and built-in illumination,
printing plates and other details in printing. this scope allows making detailed inspection even at the
Analysis of handwriting and signatures most delicate portion of a precious stone.
With built-in illumination, this scope is most Beauticians
suitable for work of this nature. Prior to regular hairdressing the nature of hairs can be
Watchmakers detected with this scope.
Less eye fatigue while checking watch Interiors, School children or students
due to self-contained illumination. For close observation of Insects, plants, minerals, etc,
Photographers this scope will be of great assistance.
For detecting scratches or other defects on a negative, this Philatelists and coin collectors
scope is superb. Also handy to inspect focusing correctness. This scope Is a must for those collecting stamps or coins.
FULL RANGE OF COMPONENTS, PC BOARDS, ETC, FOR ETI AND OTHER PROJECTS
-7
ETI January 1980
Ell2
digest
Australia to get own
broadcast satellite
The Australian Government has signalled the go-ahead
for the establishment of a domestic broadcast/com-
munications satellite system to cost $250 million.
The announcement was was expected to be in orbit by
made shortly after our the end of 1984. "We will cer-
November issue was distri- tainly not be a party to develop-
buted, which carried the ments which would allow any
story (p.10) of successful one broadcasting interest to
trials with the Canadian control television in this coun-
Hermes satellite, of satellite try," he added.
telephony and W broadcast-
Under the government's ten-
ing in Australia.
tative plans, three low -powered
Tony Staley, Minister for Post
satellites will be bought. Mr
and Telecommunications, who
Staley tabled in Parliament the
announced the approval in Par-
findings of an interdepartmental
liament, said the government
working group which recom-
would be contacting manufac-
mended the use of communica- K
turers for bids and that a tem- tions satellites in Australia.
porary satellite project office
would be set up under the De- One will be launched into
partment of Posts and Tele- space as an operational com-
communications. munications satellite, the sec-
He said that the government ond will be launched as an orbit-
has made no final decision on ing "back-up" and the third will
who will own and control the remain on the ground as a
system, although a working spare. They will also be used by
group has recommended that a the Departments of Defence,
National Satellite Commission Health, Education, Science, and
be formed to run the system. Transport.
Mr Staley told Parliament Mr Staley said the working
there are 40 000 Australians group and the National Satellite
with no prospect of getting tele- Task Force which reported last
phones and 120 000 with no year had favored using satellite
hope of getting television by the and had rejected claims that
existing ground lines. satellites would create un-
"For many Australians, satel- employment.
lite communications offer the Jobs would be created
only practicable solution to the through Australian industry,
problems of how to provide any building satellite ground instal-
services at all within a reasona- lations, and the maintenance of
ble time," he said. "For others, the equipment, it noted. The
satellite communications hold opposition spokesman on Post
opurot vtehme eonnt lyo fh poopoer fsoer rvtihcee si mo-r aInnnde sT, ewleacronmedm uthnaict atuionndse,r Ut.hEe. Australia's satellite may be something like this - Canada's Anik B.
enabling access to a wider government's proposals, "the Teldor cables available here
choice of services." moguls of Australian media
The satellites envisaged will control" would benefit from the The world-renowned Teldor ble in single -shielded and
be of a "direct broadcasting" satellites rather than the general communications cables are double -shielded cable, similar
type, able to broadcast radio public. now being distributed here to the Telshleld, and TVFI1
and television transmissions di- He said that the Labor Party by I.F.T.A. Australia. 75 ohm, 10.3 mm dia., low -loss
rectly into remote homes, pro- was not opposed to the use of cable for TV and communica-
vide two-way telephone links to communication satellites, how- Types currently available are tions applications.
remote areas and handle con- ever, he added, the opposition Telshield 6390698 75 ohm, Data sheets and further in-
ventional communications be- was not convinced by the work- 6 mm dia., aluminium shield formation obtainable from
tween towns and cities. ing group and the task force cable for TV, CATV-MATV and I.F.T.A. Australia, P.O. Box 21,
Mr Staley said the first Austra- finds that satellites would not FM applications; TVF59, Bondi Beach NSW 2026. (02)
lian communications satellite create unemployment 75 ohm, 6.15 mm dia., availa- 665-8211.
-
8 January 1980 ETI
Regulator family can
supply 5A
A series of 5A adjustable voltage regulators capable of sup-
iOnwnn ao..»..00-LOMA. WNW M..cr».11..0wm palvyaiinlgab ll0eA fr torman sNieantito cnuarl rSenetms ifcoor nsdhuocrtto pre. riods of time is now
;~_
led Known as the LM138 series, cent load regulation and 0.005
- - the new ICs are rated to provide percent per volt line regulation.
any regulated voltage of 1.2 Two external resistors set the
_1/~ -r volts to 33 volts at over 5 amps output voltage, making the
i _ ;'a1[./7 -7---- output current LM138 much more flexible than
oA` -=- = é6-a'" Manufactured in a standard ftihxeerdm aolu trpeugtu lraetigounl atios rsg.u aArlasno-,
three -lead TO -3 transistor pac- teed on the device, with power
kage, the LM138 has 0.1 per- dissipation of up to 50 watts.
-
Function generators
Beryllium Oxide
The IEC (Series 70) 20 MHz universal signal -source line
offers function, pulse and sweep generator capabilities with questions in the house!
four models to choose from, all producing sine, square,
triangle and dc -level waveforms.
Our November issue contained an article on the dangers
Model F72 and F72 combines the capabilities of "true pulse" and of Beryllium Oxide, a substance widely found in electronic
function generators into one versatile unit. equipment and components, and in heatsink compounds.
Shortly after the issue went on sale the Minister for
Models F74 and F77 add sweep capabilities to the basic pulse
and function generator combination. The top -of -the -line model Health was questioned on the subject. Below is repro-
duced the extract from Hansard, concerning the ques-
F77 also offers selectable log/lin sweep, sweep sync, and analogue
tion.
power amplifier capabilities. For further information, contact Bruce
McCarthy at Parameters on [phone]. DEPARTMENT OF HEALTH
SENATE QUESTION
(Question No. 2095j
Westinghouse fuel cell
SENATOR MASON asked the Minister representing the Minister
development programme for Health, upon notice, on 17 October 1979:
(1) Did an article in Electronics Today International, October
1979, claim that paste compounds containing Beryllium Oxide
America's Westinghouse Electric Corporation has entered were readily available in both professional and hobby electronics
into a cross -licensing agreement with Energy Research Cor- industries without packaging markings to indicate the com-
poration for the development of fuel cells. pound is highly toxic.
(2) Is it intended to inquire into this matter with a view to deter-
mining some action to be prescribed.
Fuel cells produces electricity Since the fuel cell process SENATOR GUILFOYLE- TheMinister for Health has provided
directly from fossil fuels without would bum cleaner than current -
the following answer to the honourable senator's question:
the thermal combustion cycle coal-fired processes, the base
(1) am aware that an article "Beryllium how dangerous?"
welheiccthri cias l a gsetannedraatrido np aprtr oocfe tshse. lcolaods efru etlo c ethll ec ouulltdim bae telo ccaotend- appIe ared in "Electronics Today International", October 1979
and that it claims that this toxic substance may have no warning
Bypassing direct combustion sumer, cutting down transmis- notices or labels attached to it
could raise fuel efficiency 30 to sion costs.
(2) The labelling of Beryllium, including every salt, active princi-
37 percent in electricity produc- The other fuel cell concept ple and derivative of Beryllium, has already been considered by
tion, and also create excess heat involves small fuel cells which
the National Health and Medical Research Council. Council's
which can be recaptured for resemble batteries where
Uniform Poisons Standards recommends that these substances
othTehre u fuseesl .c ell, combined with a nroalteuuraml gbays- porro dnuacpt)h thwao u(ald p ebte- be classified in Schedule 6 and thereby be subject to the follow-
ing labelling requirement
coal gasifier, could produce di- fed through the fuel cell result-
"Caution
rect current electricity which ing in the generation of electric-
would be converted to alternat- ity and excess heat at user sites. KEEP OUT OF REACH OF CHILDREN
ing current and then fed into the Because this process involves READ SAFETY DIRECTIONS BEFORE OPENING"
utility's electrical grid. This con- only a small area and is en-
cept would also leave substan- vironmentally acceptable, this The labelling of poisons or hazardous substances is a matter
tial amounts of heat to be recap- type of fuel cell could be used for the States or Territories and this recommendation has been
tured for other purposes, such on -site to service shopping forwarded to them for appropriate action.
as industrial processing and/or malls, apartments or industrial
heating. parks.
-9
ETI January 1980
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The world of professional audio production - to provide both the specialised theoretical
live sound and recording, radio, or TV sound knowledge and the practical experience
is a very tough business to break into. As in necessary to score that production job in
other fields, prospective employers look most radio, TV, or the recording industry. Intensive
favourably on those with aptitude, experience, "hands-on" experience in recording and live
and formal training. sound production, multitrack mixdown, and
A solid technical background is, of course, a mastering is included as an essential part of the
requirement for audio production work, but course, and provides a useful "portfolio" of
the story only starts with the theory; a sound actual recordings.
engineer lives by his ears and hands, as well as The course is conducted part-time over one
his mind, and it is only with experience that year, and a certificate is awarded to students
all three can be coordinated. who successfully complete all phases of the
The School of Electronics program is designed program.
For details, contact
THE SCHOOL OF ELECTRONICS
64 Alfred St, Milsons Point, Sydney, NSW 2061. Phone [phone]
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10 January 1980 ETI