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March 1978 International ew Communications Section- for Hams, SWL's and CB'ers RN I MARCH 1978 INTERNATIONAL NZ S1.50 ',LJHF FREQUENCY i COUNTER PROJECT 1 Computerised Musical 1 Doorbell Project: e o 1 e` SPECIAL OFFERS I_ aá 7 _.._ _,i I - ..`. ... .1,w mum I - r r - l =' Tstnir., -s}-== Soma flcoelR.pmv Arnow r. IRMo 0 M O O O ._.._.. ----. WI/ ..alms .11 .... _. .1 1 4 1 E lbchnia r a Tpn T.Wrpat MOO r Nrr mwrLaa e Audio enthusiasts the world over Outstanding among the amplifier RS-9900US. have come to expect exciting unit's many features is the fixed innovations from Technics. The plus variable calibration controls Two compone is RS-9900US is one of them. Unlike for equalisation lines, and Dolby* for one reason: other cassette decks it is a `cassette record and playback levels. Com- system'-the separation of the plete with peak reading meters of To outperform sensitive amplifier electronics studio standards, Dolby'` noise from the mechanical tape transport reduction circuitry and a built-in all other to obtain optimum performance 400Hz/ kHz test oscillator for cassette decks. from each. level calibration -and head Features in the transport unit azimuth adjustments. include a closed loop, double - An evaluatioft ¿if the Technics capstan, 3 -motor drive to provide RS-9900US capabilities will pro- smooth tape travel and closest vide the answer to any contradic- tape-to -head contact; pitch con- tions about cassette equipment trol of ±5% and full IC logic performance. all transport functions control of 'Under licence from Dolby Laboratories Inc. to ensure tape safety when . switching modes. The true 3 -head system permits professional -type tape/ source monitoring. ra Technics h. -f. WARRANT< For a National Technics Catalogue, please write to: T78.17 ®wicó National Technics Advisory Service, P.O. Box 49, Kensington, N.S.W. 2033. AUSTRALIAN OWNED AND PRODUCED March 1978. Vol, 8 No. 3. electronics 1 INTERNATIONAL Editorial: Les Bell Publisher: Collyn Rivers PROJECTS 136: Linear Scale Capacitance Meter Useful test instrument 11 714: VHF Log -Periodic Antenna Baluns, splitters, etc. ....33 588: Theatrical Lighting Controller Final details 47 639: Musical Doorbell Australian design! 58 140: 1 GHz Frequency Meter / Timer High-performance test gear 85 New ComnWxctrone Sectron- lot Mens.sWlf and CB*, r Ls FEATURES r ,. > .tAl1CN rar.r-- Sound.. -'"-SÑr[RMArg/IAl Looks at the 17 a1ae latest Hi-Fi UHF FREOUENCY COUNTER PROJECT Pirated Recordings Detection of counterfeits 27 Computerised Musical Doorbell Project. Inside Information from Ultrasound 41 Ultrasonics assists diagnosis Print Out New devices, boards, systems 52 Digital Electronics by Experiment 73 Practical 'teach -yourself' series Noting Down Music by Computer 79 UNBMI Computer transcribes performances Self -resonance in Capacitors 80 Important in RF applications NEWS & INFORMATION News Digest 5 PCB's for Sound projects 92 Briefs 21 Calculator Offer Necklace 95 Offer 24 Communications A Modern Magazines Print News .... 100 Publication Out News 52 Ideas for Recomended retail price only. Door Bell Experimenters ... 107 Offer 63 Reader Services Mini Mart 114 66 Index to Advertisers 114 Registered for posting as a publication - Data Sheet Category B 67 ELECTRONICS TODAY INTERNATIONAL - MARCH 1978 3 A 4N 11.14).% Puzzlea tvi ameters? Spaced/ byl specs? Or just plan confused about the who field? p ed is the answer! It's a complete up-to-the-minute guide to understanding hi-fi written in good plain non- 1>` technical English. Here's all you need to know kki, to choose the right equipment for your own special needs. How to get it right first time! A Modern Magazines v\I.' Publication 0 Rushcutters Bay. NSW 2011 from Hi -Fi Review 15-19 Boundary St, ..vailab1e from most newsagents or directly Pr;ce $3.40 (incl. postage & packing). MARCH 1978 ELECTRONICS TODAY INTERNATIONAL - 4 News Digest Lauber - I Microphone Sennheiser has now released a new, extremely small lavalier microphone with a frequency response of 50- I I , 20,000 Hz. Identified as the MKE 10, it is an omni-directional electret condenser microphone, and has flat frequency response characteristics and low sensiti- 0 vity to vibrational pick up. For outdoor 771 work it is fitted with built-in pop filter and windscreen, and an additional wind- screen is available for severe conditions. Experiment in Theatre for Television. preparation. It has Armstrong applications similar Audio/Video Pty Limited to the present range, but due to its has constructed a temporary television dimensions it may be used as a centre handheld at the Open Stage Theatre in or pocket unit. Outside Melbourne dimensions are to house one million dollars' 119.1 x 93.6 x 30.0 mm. worth of technical equipment used for Two water-resistant boxes have also the production of playwright Ray been introduced. Features are as follows: Lawler's "Doll" trilogy. Metric Taptite screws recessed into, the The television centre a contains video lid of the box to a control provide flat top room, lighting control room and surface. An earth dimmer board. connection facility is provided inside the box. Neoprene All of the videotape equipment in sealing ring. the video control Corrosion Resistant to room was supplied by Industrial and Marine Ampex Australia Pty. Ltd, environments. including Good surface. Finished stove enamelled, three VPR-1 broadcast quality video- medium hammer Grey. Readily tape recorders and this is the first time machined. Robust and rugged. Diecast these recorders have been used in a in Aluminium Alloy to BS1490 LM6. major television production in Australia. Outside dimensions are: Model 9732P Up to three cameras were 1 isolated - 125 x 80 x 45mm; Model 9920P to each of the - Ampex VPR-1 recorders 220 x 120 x 66mm. If used with equipment which lacks to give the producers a powering a greater flexibility Further information from R.H. facility, battery adaptor, when editing the final model MZA 10, is product. The Cunningham Pty. Ltd., Melbourne 329- available. three plays, "Kid Stakes", "Other 329-9633 and all states. Further details from Australian Times" and "Summer of the Seven- distributors R.H. Cunningham Pty. Ltd. teenth Doll" were produced by the Wireless Video Game (in your phone book). Melbourne Theatre Company and A new IC being developed by Intermetall Armstrong Audio/Video for the Seven GmbH, the West German division of LCD Projector Network, and will be ready for ITT Semiconductors, is designed to Liquid crystals seem to be finding their transmission by late February. operate with that company's ultrasonic way into all kinds of devices these days, or infrared remote New Eddystone boxes control chips. The the latest being a large screen multi- SAA1080 is designed to be built into colour Two additions have been made to the projection system for tactical the TV set, and will play up to tem displays, now being established range of Eddystone diecast evaluated by the boxes. games in colour. US Navy. The projector, which was developed by Hughes Aircraft, utilises The model 9830P offers the Flat Colour CRT a single liquid crystal light valve to advantages of volume with the mini- RCA's David Sarnoff Research Centre, provide 1,500 lumens on a 10 mum of height. Like the others, a ft square it has at Princeton, New Jersey, are developing close fitting flanged lid, screen. Reliability, often claimed to be a secured by four a 76 x 100 cm colour TV display about countersunk screws. problem with LCDs, seems quite good - 50 mm thick. The device uses electron MTBF The box is of the device is 5,000 hours, and supplied unfinished, but multipliers to create the free electrons, a prototype has operated reliably for surface will accept any finish, which are then accelerated to strike the 1,100 hours over a 17 month period including cellulose, with a minimum of phosphor screen. with no degradation or failure. ELECTRONICS TODAY INTERNATIONAL - FEBRUARY 1978 5 News Digest TM 500 Oscilloscope Plug -In Tektronix, Inc. have added a new oscilloscope plug-in to the TM 500 family of modular test and measure- SC SO4 80MHz OSCILLOSCOPE ment instruments. The 80 MHz, dual - sum trace SC 504 combines with a selection counters and other 4- of pulse generators, i TM 500 instruments to form versatile instrument configurations for measure- ments on digital equipment - all in one - --+-- , - 7 convenient package. In addition to ! , I -1 a compact packaging, this configuration r f t ,1_ I+ offers a rear panel interface for inter- connecting the various instruments. control, the SC 504 an With a front panel q1 can, for instance, be switched from dis- . playing external signals to displaying the .r. dt waveform input to its companion Nár counter or the output from the pulse d generator. 1CM1-9-CMi!( *POSITION P. capabilities of r 1 vsuNM ti Specific performance POI II the SC 504 Oscilloscope include 5 mV/ div sensitivity at 80 MHz; calibrated sweep rates to 5 ns/div; a selection of channel 1, channel 2, alternate, chopped, o l°¡¡w'" o channel 1 + channel 2, channel 1 - channel 2, and x -y display modes, z-axis input; and high writing speed. Auto, normal, and single -sweep trigger AC, AC low L*.__. modes; a selection of frequency reject, AC high frequency Victorian Test reject, and DC trigger coupling; and a Novice Licence - question to help all actual and are also allowed to keep the choice of channel 1, channel 2, line, In order an invaluable aid in prospective candidates for the Novice papers, this forms external, or interface (TM 500 back - the Youth Radio pinpointing weaknesses and con- plane) trigger sources provide great Amateur Licence, time.
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