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I PRODUCT SHOWCASE I Digital storage oscilloscopes The 4164 and 4162 from Gould are two new digital storage oscilloscopes which combine high digitising speed with long stores of 50K words per channel. The extended store length means that users can examine fine detail within a stored waveform, while .at the same time being able to look at long-term trends. The long store also means that the instruments are suited for use in a "baby sitting" mode for capturing random or intermittent signals. · The 4164 and 4162 are extensions of the well-established Gould 4060 series of digital storage oscilloscopes and feature 100 megasample/second sampling, 150MHz equivalent realtime bandwidth, 8-bit resolution at all input sensitivities, on-screen cursor based measurement functions , full programmability and internal hardcopy capabilities. The 4164 is a full 4-channel instrument, while on the 4162 two of the channels have been optimised for electronic control signal acquisition. A variety of display modes , including conventional Y/T, X/Y, roll, persisted and interpolated, allow acquisition data to be presented in the most meaningful form to the user. To allow detailed examination of trace data, the 4164 and 4162 incorporate a variable "zoom" facility which provides up to 1000:1 trace Miniature fans for microprocessors Are you concerned at the relatively high temperature of the microprocessor in your PC? Or perhaps a critical component in a power supply or other equipment is running a shade too hot. The remedy is to fit that red-in-theface component with its own personal cooling fan? Don't laugh. These teensy little fans do work and could be just what's needed in a confined space where the draught from a larger fan would not penetrate. The larger of the two fans is 40mm in diameter and produces quite a draught. It runs quietly but is rated at6.9 cfm (cubic feet per minute) at 6000 RPM. The smaller fan is 25mm in diameter and as you might expect, 66 SILICON CHIP produces noticeably less movement of air. It is rated for 1.3 cfm at 10,000RPM. No mounting hardware is available so you will need to contrive your own installation. It should be poss ible to mak e a mounting bracket from a small piece of aluminium. The 40mm fan is priced at $14.95 and the 25mm unit at $19.95 from David Reid Electronics, 127 York St, Sydney NSW 2000. Phone (02) 267 1385. expansion. This displays either the actual acquired data points or in situations where less than 500 points would be displayed, a linear interpolated trace. The user can select a combination of normal and zoomed traces, which allows the fine detail of the magnified trace to be viewed in conjunction with the overview. The new oscilloscopes feature a large (7-inch) display screen with an electronically generated graticule. Hard copy can be produced on an optional internal thermal or 4-colour plotter, and IEEE-488.2 and RS-423 interfaces are provided for interfacing with external HP-GL plotters, computers or controllers. For furth er information contact Elmeasco Instruments Pty Ltd, PO Box 30, Concord, NSW 213 7. Phone (02) 736 2888. Austel approved power supplies Alpha Kilo Services has released two series of power supplies that have been Austel approved. The UP0403A series are 40 watt switching supplies that have triple output voltages ranging from 5V to 24V with overvoltage and short circuit protection. Efficiency is claimed to be a m inimum of 70% and operating temp erature range 1s from zero to 70°C. The USUl00T Series are 100 watt supplies that also have triple outputs ranging from -5V to 24V with overvoltage and short cir- cuit" protection and a VDE level "B" input filter. For further information contact Alpha Kilo Services, PO Box 180, Lane Cove 2066. Phone (02) 428 3122. New ferrite materials with high saturation Siemens Matsushita Components has developed three new ferrite materials which. are mainly intended for use in switched-mode power supplies. The outstanding property of the new N97 ferrite is its low core power loss of 70mW/g under typical operating conditions (lO0kHz, 200mT, 100°c), which is approximately 18% less than comparable materials. N62 ferrite has a high saturation inductance of510mT (at 2kHz, 1200A/ m, 20°C). It gives better DC biasing compared with the previous.material; not until current intensity reaches values 10% higher does a 20% loss of inductance occur. The new material has an initial permeability of 1900 continued on page 72 EHT generator/low cost laser How many different ways can you power a small laser tube? The answer is quite a few and many of these have been explored by Oatley Electronics over the last few years. Now they have excelled themselves by releasing an EHT power supply at a very low price. Based on a TV flyback transformer and high voltage transistor, the supply is powered from 12V and will deliver a peak output of about 1 lkV. The main application being promoted is as a low cost laser power supply but the circuit could have other applications such as high voltage experiments (Jacob's Ladder, etc), replacement parts in TV sets and computer monitors and even for plasma displays such as described in the August and November 1988 issues of SILICON CHIP (copies are still available). The EHT power supply kit includes a small PC board, all the · on-board components, and the circuit and wiring diagrams. It is priced at only $23.00. Also available is a kit which adds a lm W red Helium-Neon laser tube for a total cost of $50. That is cheap. Both kits are available from Oatley Electronics, 5 Lansdowne Parade, Oatley NSW 2223. Phone (02) 579 4985. YOU CAN .NOW AFFORD A SATELLITE TV SYSTEM $ 5 99 For many years you have probably looked at satellite TV systems and thought "one day". You can now purchase ihe following K-band system for only: Here's what you get: • A 1.6 metre prime focus dish antenna, complete with all the mounting hardware. • One super low-noise LNB (1.4dB or better). • One Ku-band feedhorn and a magnetic signal polariser. • 30 metres of low-loss coaxial cable with a single pair control line. • lnfrared remote control pre programmed satellite receiver with selectable IF & audio bandwidth, polarity & digital readout Your receiver is pre-programmed to the popular OPTUS transponders via the internal memory. AV-COMM Pty Ltd, PO Box 225, Balgowlah NSW 2093. Ph: (02) 949 7417. Fax: (02) 949 7095. All items are available separately. Ask about our C-band LNBs, NTSC-to-P~L converters, video time date generators, FM2 &EPAL &Pay TV hardware. r - .- ------------· ~ I YES GARRY, please send me more information on K-band I satellite systems. I Name _ _ _ _ _ _ _ _ _ _ _ __ I Address: _ _ _ _ _ _ _ _ _ _ _ __ : - - - - - - - - ~ P'code: _ _ __ _ _ _ _ __ I Phone: _ _ _ _ _ __ I ACN 001174 478 10/91 Infrared remote control switch This fully assembled infrared remote controlled kit will switch a relay at distances up to 10 metres. The remote control transmitter is housed in a plastic case measuring 140 x 68 x 30mm and is powered by an internal 9V battery (not supplied). The receiver PC measures 110 x 55mm and it can be powered from a 9-12V supply. Current drain at 12V is 35mA on and is suitable for frequencies up to 300kHz. N59 ferrite material has been developed specifically for high frequencies up to 1MHz. Under conditions of 1MHz, 50mT and 1()0°C, it exhibits a core power loss of only 110mW/g. Saturation occurs at 480mT (20°C) and the initial permeability is 900. N59 ferrite is available now, while N62 and N97 are available in sample form only. For further details, contact Malcom Evans, Siemens Ltd, Electronics Components Department, 544 Church St, Richmond 3121. Phone (03) 420 7716. Sanyo large screen television receiver Sanyo's new TEIOO large screen television is an imposing piece of furniture in a glossy camphor wood design, with a 68cm screen. 72 SILICON CHIP standby and 120mA when the relay operates. Supplied with the kit is a 4-page reprint which features the circuits, wiring diagrams and explanatory text. So if you want to get an IR remote control system up and going with the minimum amount of electronics assembly, this is the way to go. The kit is priced at $44 and is available from A-One Electronics Pty Ltd, 432-434 Kent St, Sydney, NSW 2000. Phone (02) 267 4819. This low distortion, flat , square screen has 750 lines horizontal resolution, a wide viewing angle and reduced glare. Fuzzy Logic picture control circuitry continuously monitors the brightness of the room and the viewing distance and adjusts the image brightness to minimise eye strain. This means the set makes its own adjustments to give a high definition picture in a bright room, and a softer picture in a dark room. The Fuzzy Logic circuit also works to reduce picture noise. Picture quality is enhanced by the use of a shadow mask made from Invar, an alloy of steel and nickel to eliminate picture distortion caused by the tube's heat. A PAL/NTSC comb filter eliminates colour and dot interference for improved sharpness and definition. The set has a sub-woofer stereo sound system with Sanyo's Cascade Tuning Port system and speakers with cones made from a polymer and pulp sandwich material. Other features include inputs for S-Video and phono, a camcorder input, mini headphone jack and extension speaker terminals plus Teletext facilities. Sanyo's TEIOO model CPP2940TX has a recommended retail price of $2,999.00 and comes with a matching stand. It is available from selected retailers throughout Australia. Emtek DCT-310 AC/DC clamp meter If you are an electrician, an auto electrician or you need to measure very heavy currents without inserting a meter in series, then this AC/DC clamp meter is for you. As an example of the capabilities of this instrument, say you want to measure the current drawn by your car's starter motor but without having to disconnect any battery leads. With the Emtek DCT-310 you just set it into DC mode on the 400A range, snap the tongs around the positive or negative battery lead and then have someone start the motor. As the reading comes up on the display you can then switch to "Peak Hold" and the reading will be held until you switch it off. Many older clamp meters cannot measure DC current; they have a current transformer based on the laminated core of the tongs but this does not work at DC. This unit can measure direct current because it uses a Hall Effect device instead of a current transformer. Two AC and DC current ranges of 200A and 400A are provided, as well as a temperature range reading from -40°C +750°C using a type K thermocouple which is supplied with the unit. There is also a resistance range reading up to 2kQ and two voltage ranges , 200V AC and DC and 2000V DC or 750V AC. A very good feature of the unit is that it comes with a sturdy carry case which will be invaluable in protecting the meter against the inevitable knocks that it would otherwise get in the average toolbox. All told, the Emtek DCT-310 AC/ DC clamp meter is something of a bargain at the price of $225 plus 20% sales tax. For further information, contact Emona Instruments Pty Ltd, 86 Parramatta Rd, Camperdown, NSW 2050. Phone (02) 519 3933. 300 watt power amplifier This rugged power amplifier has an interesting circuit based on a TL071 op amp and 13 transistors. The op amp essentially provides the differential input stage and the circuit is more or less conventional following that. The four NPN output transistors are arranged in quasi-complementary symmetry, a fairly common approach in high power amplifiers. Two transistors provide overdrive protection although it is not clear from the circuit information whether this is simple drive limiting or foldback protection. Rated power output is 300 watts at .05% harmonic distortion while music power output is quoted at 540 watts. Both of these figures will depend on the voltage output and regu- Low cost answering machine This surprisingly compact answering machine is based on a single microcassette. This holds the answer message which you record and all the messages which are left by callers. As well as normal answering functions, the Hardie AM100 also includes Memo, Call Screening and Remote Access via telephone. Memo is a handy feature whereby you can leave a voice message for your family, to be played back when any other messages are reviewed. Call screening, as the name suggests, allows you to screen a call before personally answering the phone. You just let the machine answer the phone, listen to the caller speak and if you want to take the call, you just press the Stop button. Remote access is another useful feature which allows you to playback any messages over the phone. To do this you must be using a tone dialling phone or a DTMF encoder. The unit comes with a plugpack supply and is Austel approved. It is available for $89 from all Rod Irving Electronics stores. lation of the power supply which will require a rating of about 500 watts if the amplifier is to work at its maximum capability. As is usual with these fully assembled modules from A-One Electronics, the unit appears to be well made and uses readily available components. A-One can also supply suitable Australian made transformers and other power supply components, as well as rack mounting cases. The price of the 300W amplifier module is $175. It is available from AOne Electronics Pty Ltd, 432-434 Kent St, Sydney NSW 2000. Phone (02) 267 4819. SC ANTRIM TOROIDAL TRANSFORMERS • Now made in Australia. • Standard range 15VA to 2kVA. • Large ex-stock quantities available. • Competitive pricing available for OEMs & resellers. • Simply the best transformers all round. HARBUCH ELECTRONICS PTY Lm 90 George Street, Hornsby NSW 2077. Telephone (02) 476 5854. Fax (02) 476 3231. MARCH 1993 73