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VIDEO SWITCHER FOR CAMCORDERS & VCRs Solve your problems with dubbing from your camcorder to your VCR with this 3-way video switcher. It will allow you to dub from any one of three video sources and to watch any of them on your video monitor. By JOHN CLARKE Do you need to copy old Beta video tapes to a VHS machine or perhaps from your Video 8 camcorder to your VCR. Or do you just have two or three VCRs and need to watch and dub tapes between them? If you experience any of these situations, you will be fully aware of just how much of hassle it is to disconnect and reconnect all those leads. Wouldn't it be much more convenient to leave your VCRs and video monitor permanently connected to one video switch box 68 SILICON CHIP and then be able to watch any machine or dub from it at will? The solution is the Video Switcher presented here. Fig. l shows how the Video Switcher is used. The video input, video output and the audio inputs and outputs from each video recorder or camcorder connect to the video switcher. Monitoring of source 1, source 2 or source 3 is selected via the front panel Monitor switch. This enables you to watch the selected VCR on a high quality video monitor and listen either via the monitor's internal audio speakers or via a stereo system. If you don't have a video monitor, you would simply connect the modulated RF output from the Video Switcher to the antenna terminals -just as you would with a single VCR. Copying between sources is selected with the Dubbing switch. This allows dubbing from any video source to either one or both of the other machines. Note that all the VCRs may have mono, stereo or hifi stereo outputs. The Video Switcher is housed in a standard plastic instrument case measuring 260 x 84 x 190mm. On the front panel are the Monitor and Dubbing rotary switches plus the power switch. It is powered from an AC plugpack. At the rear are all the RCA sockets necessary for the audio and video inputs and outputs of three stereo VCRs and/or camcorders. In addition, there are audio and video outputs (which connect to a monitor) and a modulated RF output socket. All told, there are 22 RCA sockets plus a socket for the 12VAC power input. Inside the Video Switcher is quite a large PC board but most of the circuit components are very cheap and readily available. Most of the project cost will be made up of hardware items rather than circuit components. How it works The complete circuit is shown in Fig.2 and uses eight ICs and 16 transistors but is fairly simple and repetitive. For instance, six of the ICs are 4066 CMOS analog switches which simply do the job of switching the signals to their relevant destinations. Again, there are four video buffers which are all exactly the same circuit. The 2-page circuit can be divided into two distinct audio and video sections. The lefthand page contains the video section and RF modulator, while the righthand page is the audio section and power supply. Let's look at the righthand page of the circuit first. At the top you will see the three left channel audio inputs which are AC-coupled via 4.7µF bipolar capacitors. Below these are three right channel audio inputs with the same AC coupling. These are switched using two poles of the Monitor switch; S2b and S2c for the left 1 VIDEO RECORDER VIDEO OUT IN 2 VIDEO RECORDER AUDIO OUT IN L R L R VIDEO OUT IN 3 CAMCORDER AUDIO OUT IN L R L R VIDEO OUT IN MONITOR SOURCE 1 SOURCE 2 SOURCE 3 DUBBING 1-2, 1-3, 1-2+3 2-1 , 2-3, 2-1+3 3-1, 3-2. 3-1+2 AUDIO OUT IN L R L R VIDEO+ AUDIO MONITOR OR RF SIGNAL OUT TVOR VIDEO MONITOR VIDEO SWITCHER Fig.1: block diagram of the Video Switcher. The unit is capable of switching up to three video sources with stereo audio channels & features video, audio and modulated RF outputs for connection to a monitor or TV set. and right channels respectively. The left and right monitor outputs are mixed via two 4. 7kQ resistors and AC-coupled via a 10µF capacitor to the audio input of the RF modulator. Video monitoring Video inputs 1, 2 & 3 (top lefthand corner of the circuit) are loaded with 75Q resistors and AC-coupled to the CMOS analog switches of IC4 (bottom lefthand corner). The control inputs of the CMOS switches, at pins 6, 12 & 5 are all tied to the -8V supply via 1 0kQ resistors. One pole of the Monitor switch, S2a, selects a video input by pulling the particular CMOS switch control input high; ie, to +8V. The three switch outputs (pins 9, 10 & 4) are connected together and thence to a video buffer circuit (video buffer 0). This comprises four transistors and five resistors. Each tran- Main Features • Switches up to three video sources • Video plus stereo audio switching • Monitor any 1 of 3 sources • Video and audio plus RF monitor outputs • Dubbing available between any sources Fig.2 (following page): the circuit uses ► CMOS analog switches (IC1-IC6) to switch the various audio & video inputs. Op amps IC7 & IC8 buffer the audio outputs, while transistors QlQ16 provide high-impedance buffering for the video output signals. The rear panel carries 22 RCA sockets for the video & audio inputfoutput connections plus a socket for the DC supply. JUNE 1992 69 VIDEO DUBBING IC5b - 3 t 4 4-1 VIDEO 470 OUTPUT 470 ,...._ VIDEO BUFFER 3 16VW 16VW ~ l-4F-=lf..:...o IC6d - 11 10 013-016 ~+8V I 91 ~ 18· " ~ ,...._ - 4066 IC5a · 1~2 4 3 4-J +BV t- t-- . VIDEO BUFFER 1 16VW 16VW ~ f-:IF-=IF..:-o 05-08 I ... I I 10k _6 VIDEO 470 OUTPUT 470 '~ 1N~74s© - ~ I T I -8v-r 8 ~ 16VW 16VW ~F-=IF..:-o 09-012 4066 IC6a 1r:::'12 --9 DB 1~ 1N4148 • VIDEO BUFFER 2 -8V ~ + 8 V 13 S3: DUBBING 1 : 1-2+3 2: 1-3 3 . 1-2 4 2-1+3 5 . 2-3 6 2-1 7: 3-1+2 8: 3-2 9: 3-1 -7 VIDEO 470 OUTPUT 470 t 10k ► 10k BV 1N~f48$ -5 S3 1N~~48~ _4 - r) I. _3 - D4i(f) 1N4148 ,l-~------ - +BV 470 16VW - - - - - - - - -, IC4b ,,/ ( //"" 0.1I I 8V 10k 1 v~_2 S2a , ) 3 -BV I I --lj1.0¥,0r"""l..... Lr,r1 -BV 10k: .,. r~~__!."4-~-P-+--~: IC4c 11r':::::"110 r -8v- 4066 3I ~ ,4 t "I" ~.sv '7s I I I I ---..... 03 10k BI?~ 01 - - - - i - _ _ ; ......... BCSSB E ~E sr.:: J '-=>c ,;J'-;---1---+-, VIDEO BUFFER 0 SILICON CHIP 0.,.r•~ I I I TI 470 16VW 1k ---...:f-~YoN\-<i,--, I I I I 4.7k ·:1· AUDIO IN VIDEO IN UM1285AUS0/1 (+SV) HL-RM-TS3/4AU .(+6V) + RF IMODULATOR I ' : ~ - - - - - - - - .,._ - - - J ~ 16VW +SV I I I B~~) 04 C BC328 10k -'t ~--------.•:F-=l■Lf'-----1-0 I I /?E 02 E BC548 .....----:l------::+-1 11 70 2.2n 2.2n .__.....,B,....1_~-1..._ 1 10k - BV BC338 VIDEO MONITOR OUTPUT 470 16VW VIDEO SWITCHER RF □ MONITOR OUTPUT AUDIO INPUT 1 LEFT ~p AUDIO INPUT 2 LEFT 4.7 10 4.7 ,7 B~ 47k .,. 4.7 -BV 47k ~p AUDIO INPUT 3 LEFT AUDIO 'OUTPUT 3 ' LEFT -BV .,. +BV .,. 4.7 4.7 AUDIO OUTPUT 2 LEFT •~ ~p BP ~ S2: MONITOR 4.7 1 : SOURCE 1 2: SOURCE 2 3: SOURCE 3 AUDIO OUTPUT 1 LEFT BP -BV 47t . .,. 47k 4.7k ~ MONITOR AUDIO .,. +BV -BV LEFT •~ ~ 47k .,. +BV AUDIO DUBBING OUTPUTS AUDIO 'NPUT 1 RIGHT (rip AUDIO INPUT 2 RIGHT 4.7 AUDIO OUTPUT 3 RIGHT B~ 47k .,. (rip AUDIO INPUT 3 RIGHT ! 4066 IC1a 4.7 4.7 47k .,. .,. (rip 4.7 4.7 AUDIO OUTPUT 2 RIGHT B~ 47k .,. 47k 4.7k -BV .,. ~ MONITpR AUDIO RIGHT 4.7 AUDIO OUTPUT 1 RIGHT 14 B~ +5V +6V .,. POWER 47k 10 + 16VW+ ~ 12VAC FROM PLUG-PACK 02 8 +BV POWER LE01 1 16VW + 1 16VW + 1 _ 16VW EOc VIEWED FROM BELOW + - ,. -sv ~K ,A ffi ffi IG0 GI 0 JUNE 1992 71 AL TRON/CS 24 HOUR EXPRESS DELIVERY 'Our customers are often amazed at the speed and efficiency of our Jetservice Courier delivery. Phone your order Toll Free 008 999 007 and presto we can deliver your order next working day (country areas 24-48 hours later). Our famous 14 day satisfaction money back guarantee protects your hard earned $$$'s should ever a purchase be unsuitable for your needs. I invite you to try Australia's best electronics phone order service soon.'Regards, Jack O'Donnell Get 240V AC from 12V DC! Great for camping, on the farm. boats etc. The All New Powerhouse 1200W Inverter 1"c1u ,oo '4 (EA Feb '92) This new design of Power Inverter will provide 1200 Watts of power from a heavy duty 12 or 24V battery. Using the latest Mosfet output stage and toroidal transformer this inverter is efficient and will deliver high surge currents . The Powerhouse has been designed not only for rugged bullet proof operation but for ease of construction, two PCB's hold all circuitry with one inter-connecting cable. (7 wires) . Thi• kit come• to you In • fully drllled, pre punched ch1111t1 complete with ollk ocrHned front panel. A11embly of the kit to otmplllled ao the majority of component• mount on a olngle PCB. Thuo vlrtually ellmtnatlng all Hternal termlnalo. Suitable for uoeo In camping, boating, llohtng, mining, remote Hlllemento etc. Feature,: • Massive 1200W continuous 2400W surge will run almost anything• 12 or 24V operation selected via internal wiring • Low battery cut-out • Over temp cutout • Circuit breaker for overload protection • Auto start circuitry for standby operation • Easy to construct Comeact 40 Watt Inverter Recharge Your Mobile Phone, or Run Your Electric Shaver from $79 the Car Battery! ~, .OO This fantastic little unit is ideal for use with (SC Feb ' 2) "'-.... __ !Jlil!!!f ~.w.l'T ~1:RTER [ 4 . ... I• i -- ~ ~ I II\ ___), ~ 1 , --==----- incandescent globes, (note this model inverter will not run fluorescent lighting) electric shavers, small radios and some plug pa.ck operated devices, ie charging cordless dnlls and other rechargeatle battery appliances etc. Feature,: • Operates off 12V DC • Battery connection leads provided • Light weight • Uses Mosfet devices • High efficiency • Low heat dissapation ~hannel Guitar Mixer and Preamp ~ c ":ran 19 92) This un it features separate bass, midrange and treble controls, very low noise and distortion, separate input level controls plus an output level control. Ideal for use with most musical instruments from keyboards to guitars to tape decks . In fact, you can feed it with just about an y audio signal - it's not just lim ited to guitar outputs. • Dlatortlon: (at 1kHz and 100mV input) less than 0.0075% cil!II • Frequency Responoe: 18Hz35kHz (+/ -3dB) . The kit includes PC Board, potenticmetres, input sockets and al I specified components. The kit does not include the optional ground plane, K S535 $49.95 nor the 15V power supply board . .,,r K 6790 Kit Version $799.oo K 6792 Fully Built & Tested 12V Input $ 9 9 9 K 6793 Fully Bui lt & Tested 24V Input .00 Adjustable 0-45V, 8 Amp Bench Power Supply (SC Jan/ Feb '92) K 3360 $375 .00 Using state of the art circuitry this supply will be a great asset to the enthusiast and professional alike. It uses switch mode principles which allows for smaller transformers, and heatsinking which means greater efficiency, less heat and lighter weight. Feature,: • Variable output• Variable cu rrent limit• Separate Earth Terminal • Individual Volt and Amp Meters• Constant 13.8V setting • Short circ uit proof Speclflcallono: • Output voltage 0-45V • Output current SA <at> 35V, 6A <at> 40V • Load regu lation 1% • Ripple and Noise 40mVp-p at SA 35V • Current limit 800mA8.6A • Over current limit 9A • Foldback current less than 2A 3-50 Volta at up to 5 Amp• This supply has been one of our most popular. It includes the latest refinements and is now housed in a tough 'ABS' instrument case. This compact version uses a , high efficiency toroidal transformer resulting in less heat and weight. • Exclusive to Altronlc• • Delu xe i nstrument case • Attractive silk screened front panel • Pre-drilled and punched chassis - No holes to drill • Front panel drilled for K 3302 option. Speclflcatlono: • Output Voltage: 3 to 50V • Output Current: 5 Amps Max • Floating Output • Ripple: Less than SmV • Dual Meters Just Arrived Digital Altimeter ~ Polyswitchesl 10 Turn Pot For Precision Voltage Control Option K 3301 $4.50 for Gliders ·,r,v ." '.i>\ll ~ .• ~ " These oevices provide Fixed +/ -12V Rails lndependant of Main Output K 3302 $14.50 ! excellent protection and Ultralights .-l -=-~~--__:. for your speaker (SC Sep/ Oct '91) ~~--~~~system . They simply connect in series between your ~ This compact digita! altimeter · amp and speaker . When the current exceeds the Diaital Voice Recorder can display altitude up to 19,990 feet with 10 feet polyswitch rating they go open circuit, thus protecting r• r.,,,;--~ * resolut ion. Accurate to better than 3.5 percent. A must for hang-gliders , ultralights etc. Operates on 9V battery. K 2580 $299 .00 Here's a simple project that monitors the power drawn from a ·master' socket and 95 automatically switches on a 'slave' socket . It is versatile, because it can monitor one or several appliances Amplifier ! plugged into the 'master' and switch on one or several devices plugged into the 'slave'. Ideal for H i-Fi 's or computers with peripheral hardware . your expensive investment. R 4050 For Tweeters up to 100 watts. 0.5 amp at SOV $6.20 ea R 4055 For Midrange/ Woofers up to 100 watts. 1.15 amp at SOV $6.95 ea R 4060 For Complete System up to 200 watts. 2.45 amp at 50V $8.90 ea ':::•Ml( $149.oo 11:Y~ -;,,. I J,. ! t-!~ Thi• Dlgltal Recorder dellvero a1tonl1hlng reproduction of voice and/ or music without any '.!Jg~~,, rci'l~ital voice recorder that can store 4 $ 59. K 4360 $49.50 Deafening 110db Modulated Tone Now our top selling Car Alarm Kit. Two Sensor inputs - Normally open and normally closed enable simple connection to door, bonnet, boot light, switches etc. different signals, voice, sound or a music source of up to 30 seconds each or one recording of up to 2 minutes . Typical appllcallono Include: • Alarm system messages • Sales messages for customers put 'o n hold ' • Experimental telephone answering machine • Door Station announcer• Talking displays for shops • Emergency warning message announcement • Operation instructor for ma~hinery etc_• _Countl_ess other applications where voice or music Is required • $100's cheaper than imported digital recorders• Includes Instrument case and all components. (SC June/July '91) Make your atage production a r,rofaaalonal I/low with Ihle new Lighting M xer. Ideal for amateur thHlre groupe band• .tc. This 4-channel lighting desk is intended for theatre, disco and music group applications. It has heavy duty circuitry and is able to cope with spotlights rated up to 1000 watts or more. It has been designed and built for the rigours of commercial use. You can flash each channel up to any brightness as set by the 'Flash Master' fader. Similarly, the 'Channel Master' control fades all lights up or down, to or from their individual fade settings. Two chaser faders control the rate and lamp brilliance when the unit is operated in chaser mode. The lights can be flashed to full brilliance or to an intermediate setting as set by the 'Chaser Master' fader. K 5815 NORMALLY $~.00, THIS MONTH $2~9._oo 5510 $19.s5 Surround Sound Decoder K 5585 $39.95 (E.A. Jan '92) Build this new surround sound processor and envelope yourself with the stunning realism and dramatic sound impact available from surround-encoded videos or TV transmissions. It can also enhance conventional stereo, by providing a rear or ·ambiance' channel. SOW Mosfet Module 50 Watts RMS into 8 Ohms. This great module features moderate power output at low harmonic distortion. Simple to build and compact in size this unit makes a great replacement module for your old Hi-Fi or buy two and make your own stereo amplfier. K his great new kit enables you to ustomize your sound system in our car or at home. The circuit imply connects between the aud ource and the amplifiers. There re two outputs, one for bass nd another provides signal forth equency range (i.e. one for bass, assive crossover is required in the speaker on n + and -15V rails. The result is much betters 0-30V Power Supply 5115 $49.95 Hi Syste (SC May '88) Stereo 50 + 50 Watt Midi-Style Amplifier_ Replace That Old Beaten Up Amp! (SC Feb and March '92) ~ W,~tlril9'>~ ,v,o d /~ ~ ~ ,... -~ ' = "'»'! :~' .y,..-,., ~ :: - • This fantastic new amp has all the features of commercial units costing hundreds of dollars more using tip 142/147 transistors it is capable of producing a total of 50 Watts per c hannel RMS. Into 8 Ohms makes an ideal replacement midi unit. Performance: Output Power: SSW into 8 Ohms, 80 watts into 4 Ohms Harmonic dlotortlon: less than 20Hz to 20kHz Featur • Variable Output • Short Circuit Protected • Full 1 Amp Available • Variable Current Limit • Separate Earth Terminals • Dual Scale Meter • 3-30V to 1 Amp Max with Variable Current Limit • Output Current: o to 1 amp • Load Regulation: 0.2% Max • Output Ripple: 2mV RMS Max. This "state of the art" electronic ignition system uses the same semi-conductors as found in modern motor cars. Extends the life of plugs and points. Increases power and improves fuel economy . Compatible for 4, 6 and 8 cylinder engines. Install one into your car and start saving$$$ from the very first day . 5045 $299 .00 4015 $58.50 --..--. . . . . . . . . .=---.. . --.. . - -----,.. .-arm ----,-----,, Flush/Surface Mount Alarm New . High-Tech Panel K K With stylish compact good looks this alarm smoothly into any residential or office decorblends by either flush mounting into the wall, or surface mount. 3 sectors include 24 hour panic / fire, perimeter and internal which can be isolated enabling the alarm to be armed at night with occupants inside whilst still protecting entries. simple 4 digit access code for operation . See Altronics '92 catalogue for full details. '■i-,-,-,~---,-=~=-=-=-,-,-!-.-!-=-=-!-= ----, 1 1 3 5 6 8 9 # s 5490 $-v,efoo This Month $99.oo Alarm Power Supply This amazing new model features just about everything you could imagine! Multifunction keyring remote control will arm and disarm alarm (and activate central locking if fitted), chirp the horn, turn on car headlights, panic and even open the boot (if actuator fitted). One remote can control two alarms. Other features include: Starter inhibit, valet mode, central locking interface, flashes car indicators when tripped, auto reset plus much more! s s230 t249.oo ••","t",,'!'ll.,"4!114'!'1!'.!all,~,~~,•4•,'!'llt";"l!"••4•;"t"tl!l11"J~ S 5231 replacement Remote Control $48.50 This UPS (Uninterruptable Power Supply) will supply 12V at 1.2 Amps via its internal inbuilt sealed lead acid battery even when the mains has failed. Ideal for use with alarm system power supplies monitoring systems, warning systems etc. Satellite Siren This self contained compact unit can deliver a massive 120d8. It connects via 3 wires to any alarm system that has an output that is normally negative. Will sound if the wires are cut. Arm/ disarm inbuilt key switch. 9090 $69.95 S 5235 $6_;34s Intro Price $55.95 UHF Microprocessor Controlled Wireless Security System M Apart from the flawl&ss operation of the system one of the great features is its application with rented or leased premises - let's face it, money spent on installing a wired system in your home or office, factory , etc is irrevocably lost when you move on. With this system you simply take it with you. Ultra high-tech and push button operation makes this unit a breeze to install and operate. Features 6 sectors plus 2 x 24 hour fire and tamper circuits. The S system includes main controller, 1 Passive Infra Red Movement Detector, 1 window or door Reed switch, wired siren , power supply, back-up rechargeable battery, and a special personal remote. All sensors are radio transmitters which means no wiring is neccessary (except for the plug pack and siren) . The whole system is coded so it can not be interfered with and can be changed any time by the owner. Each individual sensor can be easily set to operate on any sector. The main controller utilizes latest EEPROM technology which means things like . selecting user on/ off codes, isolating sectors are a breeze. Includes a myriad of other amazing features , too many to mention . Wireless Remote Keypad Call AL TRON/CS today fo r a frH colour brouchure. ~ 1 complete 1y1tem lncludeo: External Siren S $1_.,u.00 1 x Control Panel Now $114.95 2015 $1 1 x Passive Infra Red Detector/ Transmitter C 1 x Door/ Window reed Switch/ Transmitter 1 x Hand Held remote Control/ Transmitter 1 x Horn Speaker - 10 watVwired 1 x 240V AC adaptor 1 x 1.2Ah Back-up Battery 1 x Set of batteries for all transmitterR Complete System Door/ Window Reed 5240 5255 s 5240 NOW O NLY $579.oo Switch & Transmitter S5247$~ Now$63.9 De-Soldering Iron Drawers Unique design allows units to be 'dove-tailed' together. Drawers _ _ -~--.: _ will not stick or seize . Single or - , ~ . ·_ :J double drawers available. 001 c\'I\ ·'· J ~ <Ja so~1.,. eer -, ·· ~ ..· H 0235 Single .95 ea 1\'I ~11/J I : This lightweight de-soldering iron allows components to be quickly and cleanly removed ~ with one hand. Naturally it's SEC approved and comes with a cleaning wand. Can be used as a . soldering iron. 240VAC 30W. Earthed. . Simple cleaning action. $4 $5 .50 ea H 0238 Doable ,,,-~ · ·- -l This Month $ 3 9 .95 . _,,_,,,.,. . ~ . .:_< ·_ . .. · · ·. ·. · -., ____2')11;___ ·· .. . · -· ._ . T 1255 Replacement 1.5mm T!P $4.95 T 1252 Replacement 1.2mm Tip $4.95 - Micron Mk II Soldering Station These cases have generous ventilation slots on both the top and bottom panels, a myriad of mounting posts are provided for PCB's and 'extra tough' mounting posts are included for securing transformers. Massive size: 355 x 250 x 122 mm. Thll Month Only H 0490 Grey Case NORMALLY H 0491 Black Case H 0492 Blue Case $~ea A 1000 $69.95 .. os IT Universal Remote Control This universal infra-red remote control makes all other remote units superfluous. Will control CD players , videos, TV's and stereos etc. Controls up to 6 different appliances. Easy to use and programme from an existing functional remote. - $45 .00 Winner ol the Taiwan Good De1lgn Award Now you can solder anywhere with this new gas soldering iron. Features • See through gas chamber (no more guessing how muc~ gas is left!)• Built in ignition cap• Uses standard butane gas• Comes with safety bench stand • Supplied with 2mm soldering tip and blow torch tip • Adjustable temperature from 400' C to 1200°C • Can be easily refilled with standard butane lighter gas• Replacement tips are less than half price of some other brands! REPLACEMENT TIPS • ALL $4.95 ea 2455 Replacement Exhaust Port T 2451 Replacement 1mm Conical Tip T 2456 Hot Knife Tip T 2452 Replacement 2mm Conical Tip T 2457 Hot Blower Tip T 2453 Replacement 3mm Conical Tip T 2458 Blow Torch Tip T 2454 Replacement 3mm Chisel Tip T 2448 Weller Butane Gas Refill $5.95 - Screwdriver tern perature adjustable between 2500C and 450°C enabling very delicate soldering on low settings with surprising heat energy reserve on maximum setting. Relative temperature is indicated by LED lamp brightness. Now u1e1 ,tale ol the art ceramic heating element. T 2446 Normally $ ~ 5 Two way printer/ peripheral computer switch with D25 sockets. Allows two printers to be run off one computer and individually selected or allows one printer to be run off two computers and individually selected. NEW D 1570 Normally $;<at>'95 FOR '92 This Month $39.95 .· All New IRODA Gas Soldering Iron Temperature Adjustable Soldering Iron A/8 Computer Switch Box T 1250 $29.95ea Electronic Temperature Controlled, Temperature Selectable, Soldering Station. The MICRON T 2440 soldering station offers the ultimate in controlled temperature hand soldering. Featurea: • Variable Temperature Control • LED Temperature Readout• Zero Voltage Switching protects CMOS Devices • Grounded Tip • 48 Watt Element • Thermocouple lmbedded in Heating Element for Precise Temperature Control • 24V Low Voltage Element• Rubber Silicon Lead • Chrome Plated, Iron Clad Ultra Long Life Tips• New Improved Ceramic Element $139 T 2440 Normally $%s5 , This Month Only .95 Massive Savings On Old Style Rack Cases AM/FM PLL Tuner - I 1"':J l:?: .,,.,..,. '!c ~ ; o . ... ith the introduction of our new range of rack cases, we have sacrificed the old tock at below cost! This means fantastic savings for you - our valued customer. lease note stocks are limited - no back orders. Unit - All $25 0404 Grey T Unit - All $30 o RRY F~or-.4 Unit - All $35 °• 0405 Grey S0402 Silver Anodised 0 i . .. . . S0403 Silver Anodised 0413 Black Powdercoat 0406 Grey P a110 $289.oo Save your precious and expensive computer hardware and hi fi etc f~om t~e power surges, spikes and lighting. A must for anyone who doesn't want their equipment blown up! New 8 way model contains two power filters. 300 Watt Inverter TURN 12V DC TO 240V AC . This fantastic inverter will power lights, TV's, tools, electric shavers and a whole host of other appliances. Great for camping, out in the bush and any place where 240V is not available. Features: • Complete with over current circuit breaker• Fused 240V output• Built in panel meter to monitor output voltage • Strong steel case and chassis. A 2210 Normally $ ~.00 This Month $199.oo _, -- - :_3 ~ ~- .:...::.... Replace that old Dial Tuner! Thi• 1tereo amp 11 Ideal for background/loreground appllcatlon1. Fantaatlc !or re1tauranll, 1hop1, dl1eo'1, aerobic•, PA 1ound 1y1tem1 and home. • 90 watts RMS per channel minimum into 8 Ohms from 20 to 20,000Hz with less than 0.05% THD • 2 large power meter indicators• EIA Panel with handle device• XLR socket for speaker terminal • Output relay to eliminate turn-on and off transients • Dimensions: (W x H x D) 482 x 92 x 295mm • Weight: 10.5kgs • Ideally suited to A 2210 stereo tuner. A 2040 ~ o This Month .00 These amazing little speakers will impress you and your friends. Carbon Fibre is a new high tech material from which these speaker cones are made. Complimented with Barrium ferrite magnets the results are simply amazing. 8 and 16 ohm versions available makes multi speaker installations a breeze. Weatherproof design makes them ideal for car doors and boats! C 0641 8 Ohm C 0643 16 Ohm T SO% 0 Normally $~95 save Up $25.oo or $40.oo pr - I _- • Thl1 fantaallc tuner la the Ideal add-on to any 10und 1yItem. Can be u1ed aa background mullc 10urce In reataurant1, lhopa ate or any PA application. Al10 a great upgrade !or the home HI-FI. Featurea: • Digital LED frequency readout display • FET FM front end for high image rejection • Phase-linear ceramic filters are incorporated in both AM and FM IF section• Phase-lock loop (PLL) IC for FM multiplex stage• Dimensions: (W x H x D) 435 x 60 x 232mm • Weight: 3kgs. 100mm Super Carbon Fibre Speakers This Month ,.._,,_<,.,.,.,. __ $",.,,,r $539 Our Top Selling 17 Range Digital Multimeter for an Amazing $39.95 With quality and features you would expect only on expensive meters the Q 1056 represents excellent value for money. Speclflcatlona: • DC Voltage: Ranges 2-2000V AC Voltage: Ranges 200V, SO0V DC Current: Ranges 200mA, to 10A Real1tance: 5 Ranges 200 Ohm, to 2M Ohm Diode Teat: Test Current 1.0mA Test Voltage 3.2V Max Battery Teat: Ranges 1.5V, 9V Loaded Current: 1.5V 100mA, 9V 6mA Q 1058 Normally ~ 9 5 This Month $39.95 Q 1057 Carry Case to Suit $12.50 ~~o~ CB Type Mlc • . . . • High performance noise !'ttenuating pa'/ earphones• Noise cancelling >f,j 'rl'i 1v1or0 · microphone • Cushioned head pad• 0r, Super sturdy • Great performance • ·• Superb, professional pilot's headset will Awarded the Good Product Design Award for CETDC in 1987. This fantastic last a lifetime with reasonable treatment Ultrasonic Cleaner can earn Fantastic new model includes many than before. Over 2000 already sold Australia wide. Computer Connectors, PCB's, Switches, Relays, Jewellery, Glasses, Watches A 0100 Normally $~00 etc. This Month Only $ 1 7 5 .oo 12V DC Computer Fan New model just arrived! 80 x 80 x 25mm. Ideal for amps, power supplies, computers and just about anything else that requires effective cooling. Exceptional value for money. F105o$17.so These models consist of only high quality wire connection . 2 Way, 80 Watts RMS Crossover Frequency: 3.5kHz dB/ Octave: 6dB c 4005 $11.95 2 Way, 150 Watts RMS c 4007 $26.95 3 Way, 80 Watts RMS Crossover Frequency: 600-800Hz/5kHz dB/Octave: 6dB c 4006 $20.95 3 Way, 150 Watts RMS Complete with appr1;>x 1.Sm , curley cord .. Fantastic_ for CB s, ,,--:: J amateur radio enthusiasts etc. C 9070 $189 .00 Car Voltage Adaptor This handy unit simply plugs into your car's cigarette lighter socket and presto' Gives you switchable 3, 4.5, 6, 7.5, 9 and 12V DC at up to 800mA. Includes a range of output plugs. Reversable polarity. Great for pocket TV's, radios, portable CDs etc . Simply brilliant Mylar stereo headsets and dynamic mic combination. M 9150 $16.95 Speaker Speclllcatlona: 20Hz20,000Hz, 32 Ohm, 3.5mm stereo jack, 6.35mm stereo jack adaptor. Microphone Speca: Dynamic type, 300 Ohm, 100 Hz15,000Hz -80db <at> 1 Khz, c 9055 $44.95 3.5mm Mono Jack Portable PIR Alarm Casio Two Colour Printing Calculator I •n. ,~ - * Crossover Frequency: 3.5kHz dB/Octave: 12dB ;, Stereo Headphones with Dynamic Mic components. PCB mounted quick connectors for easy and reliable • . New stylist model, with simple one handed operation. _Uses standard button mounting. :,~ - ' C 0335 $ 2 7 95 ,:... · _ _ _ _ _ _.,..,._ _______ cable, allowingNow evenbetter better performance! value for over in cleaning r · _. , improved microphone and shielded its cost a hundred times ·. ,, •. (_ • Includes standard aircraft jacks. High Performance Crossovers I Noise Cancelling Altronics Aviation Headset Pin Point Ultrasonic Cleaner • • A ready to go system, no installation required • Fully automatic operation, very user friendly • Large coverage area • Portable or wall mounted • Long life 9V battery operation (battery not included) • Battery low warning • Lightweight , compact and attractive. s 5305 $p8".oo, This Month $49.oo Wa ■ Super Heavy Duty Tripod coMPETITORS SAVE OVER pRICESI This great new model holds an amazing range of equipment. With rubber feet for sure and stable grip. Anti-sway bars on legs prevents wobbling. Adjustable height from approx 1 to 2 metres. Lightweight aluminium construction and collapsable for easy transportation. Removeable mounting plate makes this Crossover Frequency: 600-800Hz/5kHz dB/ Octave: 12dB tri-pod ideal for amplifiers, speakers, c 400& $49.95 c 0520 $129.95 lighting etc. P 3000 P 3010 P 3020 P 3030 P 3040 P 3050 P 3090 P 3100 P 3110 P 3120 P 3130 P 3140 P 3150 P 3190 P 3200 P 3210 P 3220 P 3230 P 3240 P 3250 P 3290 P 3310 P 3312 DB9 Male solder connector DB9 Female solder connector DB9 Male 90" PCB connector DB9 Female 90" PCB connector DB9 Male straight PCB connector DB9 Female straight PCB connector DB9 Backshell Cover DB15 Male solder connector DB15 Female solder connector DB15 Male 90° PCB connector . DB15 Female 90° PCB connector DB 15 Male straight PCB connector DB15 Female straight PCB connector DB 15 Backshel I Cover DB25 Male solder connector 0B25 Female solder connector DB25 Male 90" PCB connector DB25 Female 90" PCB connector DB25 Male straight PCB connector DB25 Female straight PCB connector DB25 Backshell Cover Spacer Screws pk 10 Spacer Screw pk 100 $ $ $ $ $ $ $ $ .. . $1.35 $1.35 $2.00 $2.00 $1.75 5 $1.75 $1.75 5 5 $1 .55 5 $1.55 50 $2.25 0 $2.25 $1.90 0 . 0 $1.90 . 0 $2.00 $1.75 .5 $1.75 $2.85 $2.65 $2.25 $2.25 $2.25 $4.45 $35.95 10 Up $1.20 $1.20 $1 .80 $1.80 $1.60 $1.60 $1.60 $1.40 $1.40 $2.00 $2.00 $1.70 $1.70 $1.80 $1.60 $1.60 $2.40 $2.40 $2.00 $2.00 $2.00 HEAVY HEAVY SERVICE -- All orders of 10Kgs or more must travel Express Road - Please allow 7 days for delivery. $12.00 to 10Kgs. $15.00 over 10Kgs. INSURANCE - As with virtually every other Australian supplier, we send goods at consignees risk. Should you require comprehensive insurance cover against loss or damage please add $'..00 per $100 of order value (minimum charge $1). When phone 174 Roe St. Perth W.A. 6000 Phone (09) 328 1599 PHONE TOLL FREE 008 999 007 MAIL ORDERS C/- P.O. Box 8350 Stirling Street PERTH W.A. 6849 ordering please rP'..IUest "Insurance". TOLL FREE PHONE ORDER - Bankcard, Visa, Mastercard Holders can phone order toll free up to 6pm Eastern Standard Time. Remember with our Overnight Jelaervlce we deliver next day. STANDARD DELIVERY & PACKING CHARGE $5.50 to 1Kg, $8 1Kg-5Kg AUSTRALIA WIDE - We process your order the day received and despatch via. Australia Post. Allow approx 9 days from day you post order to when you receive goods. OVERNIGHT JETSERVICE Up to 3Kg is $10.00, 3Kg to 5Kg is $23 .00 - We process your AL TRONICS RESELLERS Chances are there is an Altronic Reseller right near you - check this list or phone us for details of the nearest dealer. Blue Ribbon Dealera are highlighted with a ■ These dealers generally carry a order the day received and despatch via. Overnight Jetaervlce Courier for delivery next day comprehensive range of Altronic products and kits or will order an y required item for Country areas please allow additional 24-48 hours. you. WA COUNTRY ALBANY BP Electronics ■ (098) 412681 Micro Electronics (098) 412077 BUNBURY Micro Electronics (097) 21622,' ESPERANCE Esperance Communications (090) 713344 KALGOORLIE Todays Electronics ■ (090) 215212 MANDURAH Lance Rock Retravision (09) 5351246PORT HEDLAND Ivan Tomek Electronics (091) 732531 ROCKINGHAM TV Joe's (09) 5271806 NT ALICE SPRINGS Farmer Electronics (089) 522388 DARWIN Ventronics (089) 853 622 VIC All Electronic Components (03) 6623506, TECS (03) 6706474 BORONIA Ray Cross Electronics ■ (03) 7622422 CHELTENHAM Talking Electronics (03) 5842386 COLLINGWOOD Truscott Electronics (03) 4198208 CROYDON Truscott Electronics ■ (03) 7233860 PRESTON Preston Electronics ■ (03) 4840191 COUNTRY BAIRNSDALE LH & LM Crawford (051) 525677 BALLARAT Ballarat Electronics (053) 311847 BENDIGO KC Johnson ■ (054) 411411 CRANBOURNE Mart's Electronics (059) 968200 MILDURA McWilliam Electronics (050) 236410 QLO Delsound PL ■ (07) 8396155 WEST END B.A.S. Audiotronics (07) 8447566 WOODRIDGE David Hall Electronics ■ (07) 8082777 COUNTRY GLADSTONE Gladstone Electronic Services (079) 724459, Electronic Enterprises (079) 726660 MAROOCHYDORE MALS Electronics ■ (074) 436119 MARYBOROUGH Keller Electronics (071) 214559 NAM BOUR Nambour Electronics (074) 411966 PIALBA Keller Electronics (071) 283749 ROCKHAMPTON Access Electronics (East St.) (0791 221058 TOOWOOMBA Hunts Electronics (076) 329677 TOWNS VILLE Super Solex ■ (077) 724466 SA Force Electronics ■ (08) 2125505 BRIGHTON Force Electronics ■ (08) 3770512 CHRISTIE$ BEACH Force Electronics ■ (08) 3823366 FINDON Force Electronics ■ (08) 3471188 HOLDEN HILL Force Electronics ■ (08) 2617088 LONSDALE Force Electronics ■ (08) 3260901 ENFIELD Aztronics ■ (08) 3496340 COUNTRY WHY ALLA Eyre Electronics (086) 454764 TA$ HOBART George Harvey ■ (002) 342233 LAUNCESTON George Harvey ■ (003) 316532 NSW David Reid Electronics ■ (02) 2671385 SMITHFIELD Chantronics (02) 6097218 COUNTRY COFFS HARBOUR Coffs Habour Electronics (066) 525684 NEWCASTLE Novocastrian Elect.Supplies (049) 621358 WARNER$ BAY Vilec Distributors (049) 489405 WINDSOR M & E Elect. and Communications (045) 775935 WOLLONGONG Newtek Electronics ■ (042) 271620, Vimcom Electronics (042) 284400. VIDEO MONITOR OUT • • - - - - S3 - - - ~ +SV • • • • • • Fig.3: install the parts on the PC board exactly as shown on this layout diagram. Fig.1 on the preceding pages shows the lead connections for the transistors & regulators. Be sure to use the correct transistor at each location. sistor is connected as an emitter follower and the four transistors function together as a compound complementary emitter follower; ie, as a high impedance buffer with a voltage gain close to 1. The output of the video buffer drives the video monitor output via two backto-back 470µF capacitors. This same signal is also fed to the RF modulator via a lkQ and 4. 7kQ resistiv~ divider. The specified RF modulator ·can be either a UM1285AUS0/1 which operates from a 5V supply or a HL-RMTS3/4AU type which operates from a 6V supply. Audio & video dubbing The audio dubbing circuitry uses 12 separate analog switches, in IC1, IC2 & IC3. The switches are arranged to allow selection of all dubbing possibilities for both the left and right channels. The actual switching of the 76 SILICON CHIP control inputs is done by 12-position switch S3, in conjunction with diodes D3-D8. For example, position 2 of S3 applies +8V to pin 13 ofICla and to pin 12 ofICld. This selects (dubs) the left and right channel inputs of source 1 so that they are fed to the left and right channels of output 3. All the remaining control inputs are held low via the 10kQ pulldown resistors to -8V. Position 1 of S3 applies +8V via diodes D3 and D4 to pin 13 of ICla and pin 12 ofICld for the audio CMOS switches, plus pin 5 ofIClb and pin 6 of IC1c for the video CMOS switches. This dubs source 1 to both outputs 2 and 3. All six audio outputs (three left and three right) are buffered using op amps IC7 and IC8. These op amps are set up as unity gain buffers. The video signals are dubbed using CMOS analog switches IC5 and IC6. The control inputs for these analog switches are again switched by rotary switch S3. All three video outputs are then buffered by complementary emitter follower circuits identical to that used for the video monitor output. Power for the circuit is derived from a 12VAC 500mA plugpack which feeds two halfwave rectifier circuits, comprising diodes Dl and D2 and the associated 1000µF capacitors. The plus and minus supplies then feed 3terminal regulators to provide ±8V for the audio and video buffers and the CMOS switches and either +5V or +6V for the RF modulator. Co~truction Virtually all of the circuitry for the Video Switcher is mounted on a PC board measuring 168 x 218mm (code SC02204921). The component layout is shown in Fig.3. Begin construction by checking the copper pattern of the PC board. Check for shorted or open circuit tracks and make any repairs necessary. Check also that the board will accept the mounting pins of the RCA sockets and the RF modulator. Once these checks have been made, insert all the PC stakes, links and ICs. Make sure that the ICs are oriented correctly. Be careful not to mix up the 4066 ICs with the TL074 IC. The resistors can be inserted next. These are all 1 % types and their colour codes are shown below in Table 1. We also suggest you check the value of each resistor with your digital multimeter, before it is inserted into the PC board. Now insert the diodes. Diodes D1 and D2 are 1N4002 rectifier types while D3-D8 are small signal types. Be sure to orient them correctly as shown on the overlay diagram. The transistors and regulators are mounted next. There are four types of transistors, so be sure to use the correct type at each location. Each regulator is different so again be careful when installing these. Note also that REG3 needs to be either a 7805 or 7806, depending on the type of RF modulator. Now for the capacitors. The O. lµF and bipolar electrolytic types can be mounted either way around while the normal electros must be inserted with correct polarity. The RCA sockets are supplied in banks of 2 rows and 3 wide. You should be supplied with four sets of these and one will have to be cut down to a single bank. When these are all soldered in, the RF modulator can be mounted. Front & rear panels The Dynamark labels for the fr0nt and rear case panels can now be affixed. Drill out the holes in the front PARTS LIST 1 PC board, code SC02204921, 168 x 218mm 1 Dynamark front panel label, 251 x 75mm 1 Dynamark rear panel label, 251 x75mm 1 plastic instrument case, 260 x 84 x 190mm 1 12VAC 500mA plugpack 1 2.5mm panel socket to suit plugpack 2 chassis mount RCA sockets 4 3 x 2-way PC mount RCA sockets 1 RCA line plug 1 single-pole 12-position rotary switch 1 3-pole 4-position rotary switch 2 knobs to suit above switches 1 panel mount power switch 1 5mm LED bezel 29 PC stakes 1 UM1285AUS0/1 modulator or HL-RM-TS3/4AU modulator 5 plastic cable ties 1 TL074, LF347 quad FET-input op amp (IC?) 1 7808 3-terminal regulator (REG1) 1 7908 3-terminal regulator (REG2) 1 7805 5V regulator for UM1285AUS 0/1 modulator (REG3) or 1 7806 6V regulator for HL-RM-TS3/4AU modulator 4 BC558 PNP transistors (01,05,09,013) 4 BC548 NPN transistors (02,06,010,014) 4 BC338 NPN transistors (03,07,011,015) 4 BC328 PNP transistors (04,08,012,016) 2 1N4002 1A diodes (01-02) 6 1N4148 signal diodes (03-D8) 1 5mm red LED Capacitors 2 1000µF 25VW PC electrolytic 9 470µF 16VW PC electrolytic 4 10µF 16VW PC electrolytic 15 4. 7µF bipolar electrolytic 3 1µF 16VW PC electrolytic 8 0.1 µF monolithic ceramic Wire & cable 1m twin shielded audio cable 50mm single shielded audio cable 1m black hookup wire 1m blue hookup wire 1m yellow hookup wire 200mm red hookup wire 2.5m 0.8mm tinned copper wire 100mm 75n coax cable Resistors (0.5W, 1%) 12 47kQ 1710kQ 3 4.7kQ 1 1kQ 41000 3 75g 82.2n Semiconductors 6 4066 quad analog switches (IC1-IC6) 1 TL072, LF352 dual FET-input op amp (IC8) Miscellaneous Machine screws & nuts, selftapping screws, solder. TABLE 1: RESISTOR COLOUR CODES 0 No. Value 4-Band Code (1%) 5-Band Code (1%) 0 12 47kn yellow violet orange brown yellow violet black red brown 0 17 10kQ brown black orange brown brown black black red brown 0 3 4.7kn yellow violet red brown yellow violet black brown brown 0 1 1kQ brown black red brown brown black black brown brown 0 4 100n brown black brown brown brown black black black brown 0 3 75g violet green black brown violet green black gold brown 0 8 2.2kQ red red gold brown red red black silver brown JUNE 1992 77 REAR PANEL VIDEO OUT RF OUT . . .,__ I RCA SOCKETS AC ~ INPUT -r- ~IR~ 20 ~ 22 21 75n COAX 12 14 •• 19 17 18 15 16 13 • MODULATOR 10••,, 98765432 •• • •• ••• ' f1~//j~1222 20 1 o/,/ .(; : 3:: ~,~~21 15 , ~ 1 9 17 FRONT PANEL Fig.4: use 75Q coax for the connection between the RF modulator & the RF output terminal & note that the earthy side of the plug must be soldered to the modulator's case. Take care with the wiring to switches S2 & S3. panel for two rotary switches and the LED bezel. The power switch requires a rectangular hole which can initially be drilled and then filed to shape. The rear panel requires holes for the RCA sockets and the power socket. 78 SILICON CHIP Nate that the power socket is mounted at 45° to the vertical so that it clears the video monitor socket. You will also need to drill holes so that you can secure the RCA sockets to the rear panel using screws and nuts. These sockets have integral bushes for this purpose. Wiring Follow the diagram of Fig.4 when wiring the PC board to the hardware in the case. The dubbing switch (S3) can be wired up using hookup wire but use a variety of colours so that KODFORCHIPS. .. KOD FORCHIPS. ..~FORCHIPS. .. ~ FORCHIPS... ~FORCH/PS_.~ FORCH/PS... ~ FORCH/PS. .. ~... ~ . Check Our Comprehensive Range of Computer Accessories Switch BOIIIS & Buffers Keyboard Extension 2 Way Auto Switch 9 Pin Data SWITCH RS232 Data Switch RS232 Data Switch 2 Way Centronlcs switch lnllne Parallel Buffer AUTO-SWITCH·PARL CAS-SWB-09-AB CAS-SWB-25-ABCD CAS-SWB-25-AB CAS-SWB-36-AB CAS·BUFFER-128K 85.00 36.15 59.50 34.00 58.15 231.00 Gender Benders 25.85 10.50 7.95 19.95 47.40 47.40 14.75 79.95 10.50 11.60 10.50 7.95 7.95 7.00 19.95 19.95 11 .65 7.70 8.15 9.95 Converters & Extende" CAS·BIDI-CVTR CAS·LINK·RX CAS-LINK•TX CAS·PRL·EXTD·D25 Keyboard Extension 154.00 72.80 58.50 114.80 SeriaVeara11eVSerial Link Rcvr use with TX Link Tcvr use with RX Parallel Extender D25 7.00 Printer Leads CL-PRNTR·RA-2.0M CL·PRNTR-RA-3.0M CL ·PRNTR·ST·1.8M CL ·PRNTR·ST-4.0M 2.0M DB25/CENTRONICS 3.0M DB25/Centronics 1.8M DB25/Centronlcs 4.0M DB25/Centronlcs CL·SCSl-25/50· 1 CL·SCSl-25/50-2 CL·SCSl-50/50-1 CL·SCSl-50/50-2 1M 25D to 50 Centronics 2M 25D to 50 Centronlcs 1M 50/50 Centronlcs 2M 50/50 Centronlcs 17.05 27.85 RS232 Mini Patchbox RS232 Mini Tester Mini Patch Box 25 to 25 M/M Bender 25 to 25 F/F Bender D25 M to FWiring Box Centronlcs Female/Femal Centronlcs 36M/M Null Modem Adaptor RS232 Breakout Box DB9 Pig to DB25 Ski DB9 Ski to DB25 Pig DB9 Ski to DB25 Pig 9 Pin Female to Female 9 Pin Male to Female 9 Pin Male to Male 9 Pin Female to 915F Gender Bender HOD 15 Plug to 9 Male D25M to 4 Pin RJ Ski D25M to 6 Pin RJ Ski D25M to 8 Pin RJ Ski CAS-D25-MINI-BOX CAS·D25-M IN I·TES CAS·D25-PATCH CAS·D25M-D25M CAS-D25F·D25F CAS·D25F·MIWIRE CAS·C36F-C36F CAS·C36M·C36M CAS·D25-NULL·MOD CAS·BREAKOUT·BOX CAS-D09M-D25F/A CAS·D09M-D09M CAS-D09F·D25M/A CAS-D09F-D09F CAS·D09M·D09F CAS·D09M/D09M CAS·D09F-HDD915F CAS·D09F·HDD915M CAS·D09M·HDD15M DCA-115 DCA-116 DCA-117 CL·KEYBOARD·STR 9.95 9.95 14.95 29.95 SCSI Leads 24.95 29.95 29.95 34.95 Disc Storape Boxes DISC·80X-3x80 DISC·BOX·5x100 DISC-CASE 14.95 14.95 1.95 Storage Box 3.5 x 80 Storage Box 3.5 x 100 Small Disc Case 14.95 14.95 29.95 14.95 13.10 13.10 7.65 14.95 20.70 11 .65 11 .65 17.30 19.95 12.95 13.10 2M D09 Ski to D09 Ski 2M D09 Ski.to D09 Pig 9 to 9 M/F 5 Metres 9 to 9 M/M 2 Metres 2M 9 Ski to 15 Pig 2 Metre High Density 2M 9 Ski to 25 Pig 25 to 25 M/F 2 Metres D25 Pig to Ski 2 Metre DB25 Pig to Pig Lead D25 Plug to Plug 5M 25 to 25 M/M Null Modem MAC+ to IMAGEWRITER 2.0M 9 to 15HDD Lead New Electronic Workbench Tht1 Electronics Lab you keep In your PC/ YES you can now build simulate and test Analog and Digital Circuits without laying your hands on a single component! It's so easy with Electronics Workbench® Do It all with the · rt f th mouse - drag new pa s rom e parts bin, drop them onto the breadboard and click to run wires. Editing circuits is easy as wires are re-routed automatically. It's much faster than buildln~ real circuits . No faulty parts! Its the result of 10 years Innovation and thousands ol students, hobbyists and engineers have been using the Workbench since its Introduction in 1988 linaiov Module Includes a comprehensive parts bin Includes op-amps, zeners, transistors etc • Function ~enerator with sme, squ?re, triangl~ etc • Oscilloscope with dual trace, Intl ext trigge!1 nanosecond timebase upto 999MHz • Bode Plotter for frequency responses and phase shift (·200 to +200dB) • SPICE Simulation plus transient and steady-state simulation Digital Module Includes • compre · h•ensive · rt bi ·th pa s n wi g?tes, flip-flops, half adders, a1splays etc • Word Generator up to 16x8-blts . . . • Logic An_alyser with 8 channels, lnl/~xt trigger • Logic Converter converts between gate, /ruth table and boplean Professional version has mhanced colour interface, supports maths co-proqessor. Requires IBM AT pr PS/2 with 286 or greater, hard disk, 640kB RAM, Microsoft mouse, EGA/ VGA and DOS 3.0. $429.00 Personal Plus Version is monochrome. Requires P<;IXT/AT or PS/2 2 floppies or hard disk, 512kB RAM, Micro$0ft mouse, CGA/ EGA/VGA/Hercules graphis adaptor and DOS 3.0 or greater. $299.20 See the review In Electronics Australia March 92 "Electronics Workbench is certainly the easiest simull1tor l'v• ever used" Peter Philips This popular MS-DOS software and cabling riackage enables technicians serial data sophlstlcatea problem solving facilities at a fraction of the cos1 of dedicated hardware systems. SerialTest provides a window onto RS232 lines operating either as a passive observer or actively sending data or control signals to simulate either at DTE or DCE device. Triggers can be defined based on error conditions or data to Initiate or terminate monltodng sequences. • Handles baud rates up to 115.2kbaud. • View each byte In ASCII or EBCDIC. decoded to hex, decimal, binary or octal ~g~:i :n':i~: WtJ: Memorex Discs DISC-DSDD-3 DISC-DSHD-3 DISC·DSDD-5 DISC·DSHD-5 19.95 39.95 12.95 22.95 Double Density Dlscs/10 High Density Dlscs/10 Double Density Discs/10 High Density Discs/10 Memorex Coloured Individual Plastic Box DISC·DSHD-3-BLU DISC-DSHD-3-GRN DISC-DSHD-3-PNK DISC·DSHD-3-YLW 3.5 DSHD Blue Disc each 3.5 DSHD Green Disc each 3.5 DSHD Pink Disc each 3.5 DSHD Yellow Disc each DISC·DSDD-5-NN Double Density 5 1/4/1 o FDC-1 FDC-3 5 1/4 Floppy Disc Clnr 3 1/2 Floppy Disc Clnr MOUSE-KEEN KEEN Mouse + Software 4.95 4.95 4.95 4.95 No Name 6.50 Lealls CL-ll09F/009F·2 CL·D09F/009M·2 CL·D09F/009M·5M CL-D09M/009M-2M CL-D09F/HDD0915M CL·D0915F/D0915M CL-D09F/025M·2 CL-D15F/D15M-2M CL·D2M/D25F-FLAT CL-D25F/D25M-2M CL·D25M/025M·2M CL·D25M/D25M·5M CL·D25M/025M·NM CL-36 PS2 Monitor Lead Seriallest serial data analysis on your PC Disc Cleaners 4.95 6.95 Mouse 34.95 Surge Protectors CAS·INLINE·SURGE CPEP1 LF-2 LF-4 SURGE-PROTECTOR lnline Surge Protector Modem Protector 2 Filtered Plugs 4 Filtered Plugs THE BUTTON Surge Pro!. 30.80 59.95 127.00 386.40 29.95 Overcomes problem of communicating between serial and parallel devices. Effective, works in both directions. Supports both DTR handshaking and X-on/X-off protocol. $154.00 Modular Link Connect up to 16 computers to one printer. Extremelv easy to use - just plug in and go! All control and switching logic Is totally automatic. Transmitters and receivers sold separately ..Transmitters have 15m of interconnecting cable. Receivers $72.80 Transmitters $58.50 each Miss E.A. December? Then send for BpageFREE Semiconductor Listing $480.00 Send $10 for a demo disk, refundable on .purchase. New Lab 4Everything you need in a single instrument! Ideal for the professional and keen hobbyist. Saves bench space. High accuracy yet low cost. Just checR the features - Function Generator Justin! BI-Directional Interlace Converter • Writes captured data dlrectlv to disk to allow maximum capfure buffer • CRC checksum calculations • Auto:configuration to any of the comms ports 1 to 4 • Time-stamping (absolute and relative) including delta time calculations • Split line DTE over DCE di~play • Sine, square, triangle, skewed In-Line Buffer Just plug the printer side Into your printer and connect your printer cable. Send your output file as usual and the buffer will absorb It as fast as you can send it! Can also be used to double the distance of transmission with parallel systems. Parallel Line Extender $231.00 Transmit parallel data up to 350m using simple 2 or 4 conductor telephone cable. Plugs in to computers parallel port and then run cable to printer. 15m cable provided. D25 $114.80 Special Save $1.00 on UB11 Boxes Normally $6.95, This month ONLY $5.95· Geoff Wood Electronics Pty Ltd t ~ae~i~eo.b1~~ef;~ij~~re • output from 0.1Vpp to 20Vpp • Linear and Log sweep - 20ms to 2s (Intl or 100:1 VCF (ext) • 500/600'1 output Frequency Counter • Hfz to 100MHz • 15mV sensitivity to 60MHz • 0.1 to 1OOHz resolution • 10ms to 10s gate • 10MHz reference with 5ppm stability • 8 digit display with annunciators Digital Multimeter • 3 1/2 digit LCD • Auto/Manual ranging • Vdc, Vac,n, Ade, Aac functions • 0.5% basic accuracy • • Data Hold • Memory mode for relatiuve measurements and zeroing il's Power Supply • 3 1/2 digij voltage display • Triple output • 0 to 50V, 0.5A • 1sv 1A and 5V 2A fixed • 1mv ripple • Full overload protection Incredible value at $837 .00 Inc tax $722.00 ex tax (Inc In N s W) 229 Burns Bay Road, (Corner Beatrice Street). Lane Cove West N SW Mail Orders to - P O Box 671, Lane Cove N S W 2066 Telephone: (02) 428 4.111 Fax: (02) 428 5198 8.30am to 5.00pm Monday to Friday. 8.00am to 12 noon Saturday Mail Orders add $5.00 min to cover postal charges Next day delivery in Sydney add $8.00 All prices Include Sales tax unless stated otherwise Tax exemption certificates accepted if the line value exceeds $10.00 BANKCARD, MASTERCARD, VISAf CHEQUES or CASH cheerful!~ accew;d. ~ ;:q ~ subsequent checking will be made easier. The monitor switch (SZ) has both shielded cables and hookup wires running to it. Note that the shields of the cables are terminated at the PC board ends but not at the switch. At the switch end of the cables, the shields should be cut right back to avoid any possibility of shorts. ' The video output socket is wired to the PC board with a short length of shielded audio cable. The RF modulator output connection to the rear panel RCA socket requires careful termination to avoid spurious interference on the picture. It is important to use 75Q cable and to solder the RCA plug to the RF modulator case. Once the wiring is complete, carefully check your work against the diagrams ofFig.3 and Fig.4 to ensure that everything is correct. Powering up Plug in a 12VAC plugpack and 80 SILICON CHIP switch the Video Switcher on. The ·front panel LED should light and you should immediately measure the supply voltages to the ICs. Connect the negative probe of your multimeter to ground (0V) of the circuit (the RF modulator case is suitable) and check that +8V is present at pin 14 of ICs 1-6, pin 11 ofIC7 and pin 8 ofIC8. Similarly, -8V should be present at pin 7 of ICs 1-6 and pin 4 of IC7 and IC8. Check that the RF modulator supply is either +5V or +6V, depending on the regulator chosen for REG3. Further checking of the Switcher can now be done using your video equipment. Connect the audio and video outputs of each VCR (or camcorder) to the audio and video inputs of the Switcher. Similarly, the audio and video inputs of each VCR connect to the audio and video outputs of the Switcher. Note that if you have a mono VCR, it is only necessary to connect the audio inputs and outputs to the left- Dress the leads to the rotary switches carefully & lace them together using plastic cable ties to keep the wiring tidy. The slug in the bottom centre of the modulator may need adjusting slightly for best results - see text. hand channel input and output of the Video Switcher. Monitor connection You can use either a conventional TV set or a video monitor which has audio and video inputs. If a monitor is to be used, connect the audio and video monitor outputs of the Switcher to the monitor's audio and video inputs. If a TV set is used, connect the RF output to the TV's antenna terminal. In this case, the TV will need tuning (channel 0) to obtain the best picture quality. Once everyt4ing is connected, you can check that the monitor switching is operating as it should. The picture should be clean and without a hint of =~ ~~ :;:=;:;;1 _,,..--...:-=,u ~ ::,00 0- -0 SC02204921 signals from the other sources noticeable. Problems with the picture may be caused by a faulty video buffer stage. If there are herringbone patterns in the picture when using the modulator output, you may need to slightly adjust the video slug in the modulator. In the case of the UM1285AUS modulator, the video slug is the more central one. The second slug affects the sound and should not be touched.SC JUNE 1992 81