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PRODUCT SHOWCASE The catalog number is AA-2022 and the price is $89.95 from all Jaycar Elec tronics stores and resellers. VHF transistor has low feedback capacitance Stereo headset has microphone Jaycar Electronics has introduced a new telecommunications headset with a dynamic microphone attached. They have soft cush ion leatherette earpads and headband and a weight of 250g, making them comfortable for sustained use. Their nominal imped- Scopemeter now has 100Hz bandwidth The new Fluke 105 Scopemeter series II has a bandwidth of 100MHz. It combines the high bandwidth of a digital storage oscilloscope and a true RMS digital multimeter into a compact battery powered instrument. Unlike some complex oscilloscopes, the Fluke 105 is easy to use, offering menu driven operation and one button access to over 30 common measurements. The Scopemeter allows the user to switch quickly between meter and scope functions. In either mode the unit provides both numeric readings and waveform display of the measured signal. 82  Silicon Chip ance is 400W at 1kHz and rated input power is 30mW. The dynamic micro phone is 19mm in diameter, has an impedance of 200W and is sup ported by a 4.5mm goose neck tube. The headphone connection is via a 3.5mm stereo plug and a 3.5mm mono plug is used for the microphone. Both plugs come with 6.5mm adaptors. Zetex has released a new NPN transistor for VHF applica tions. The BFS20, in an SOT23 package, has a feedback capacitance of 0.35pF which helps reduce Miller effect. It can handle pulsed currents up to 25mA, has a maximum Vcb of 30V, a maximum Vce of 20V and offers useful performance at 275MHz. The BFS20 is avail able on tape and reel in quantities of 3000 and 10,000 units. Further information is available from GEC Electronics Division, Unit 1, 38 South St, Rydalmere, MSW 2116. Phone (02) 638 1888. Industrial cases for PCs The Knurr IPC Chasseleon Industrial PC case is now avail able, having been designed to accomodate the increasing range of industrial PC products. Low noise fans producing a level less than 30dB are used, along with air The desired measurement is simply selected and the unit automatically configures itself. For complex signal measurements the Continuous Autoset function continually selects the appropraite timebase, input range, trigger level and trigger slope as the input signal is changed. At any time these settings can be made manually. The true RMS digital multimeter can measure up to four parameters simultaneously, while displaying the signal waveform. These include square waves, pulse trains and other non sinusoidal voltages up to 5MHz. For further information, contact Philips Scientific and Industrial, 34 Waterloo Rd, North Ryde, NSW 2113. Phone (02) 888 8222. baffles to ensure adequate PC board ventilation. The front mounted fan air filter can be changed during operation. All built-in components have a chromate finish to ensure adequate EMC shielding. A continuous rear panel with a recessed mounting protects connecting cables from mechanical damage. The enclosure can be mounted in a 19-inch rack or used as a freestanding bench unit. It is supplied fully wired and available with a comprehensive range of accessories. For further information, contact Ricon Pty Ltd, 66-76 Dick son Ave, Artarmon, NSW 2064. Phone (02) 439 6078. Marconi defects analyser Marconi Instruments has announced the release of the Model TR-8 Manufacturing Defects Analyser (MDA). It is claimed that this new product offers analog test performance rivalling much more expensive units. Different measurement techniques and ranges can be selected to optimise each component test. For example, measurement amplitude can be chosen to prevent parallel diode interference or the selection of various stimulus frequencies can be optimised for the impedance of the components being measured. The TR-8's multi-amplifier guarding system can be used to isolate component meas urements from other parallel circuitry. Building on the proven features of Checksum's well estab lished model TR-4 MDA system, the TR-8 can be extended to check for open connections to devices such as ICs or connectors with the optional HP TestJet technology. For more details, contact Marconi Instruments Pty Ltd, Unit 1, 38 South St, Rydalmere, NSW 2116. Phone (02) 638 0800. June 1995  83 K ALEX The UV People ETCH TANKS ● Bubble Etch ● Circulating LIGHT BOXES ● Portuvee 4 ● Portuvee 6 ● Dual Level TRIMMER ● Ideal PCB DRILL ● Toyo HiSpeed MATERIALS ● PC Board: Riston, Dynachem ● 3M Label/Panel Stock ● Dynamark: Metal, Plastic ✸ AUSTRALIA’S NO.1 STOCKIST ✸ K ALEX 40 Wallis Ave, East Ivanhoe 3079. Phone (03) 9497 3422, Fax (03) 9499 2381 TRANSFORMERS • TOROIDAL • CONVENTIONAL • POWER • OUTPUT • CURRENT • INVERTER • PLUGPACKS • CHOKES STOCK RANGE TOROIDALS BEST PRICES APPROVED TO AS 3108-1990 SPECIALS DESIGNED & MADE 15VA to 7.5kVA Tortech Pty Ltd 24/31 Wentworth St, Greenacre 2190 Phone (02) 642 6003 Fax (02) 642 6127 84  Silicon Chip UPS expandable up to 6.4kVA The Meta System HF UPS (uninterruptible power supply) brings a new approach to the problem of buying a UPS - has been how to select the UPS to match the immediate demand and allow for future expansion. This has been resolved in the past either by buying a much bigger and more expensive supply than is required, or buying an additional UPS at a later time. The Meta System does not link supplies together to increase capacity but simply adds expansion cards. Based on 800VA cards that plug into a stylish cabinet, systems can be configured from 800VA to 6400VA. Each time you add a card you add a battery set, thus maintaining your battery backup time. As the power cards operate in parallel, the Meta System HF can be used for extremely sensitive applications where a high level of redundancy is required. If one card fail, another will automatically take up the load. An extremely wide input voltage capability means the HF can provide a stabilised 240V output without drawing power from its batteries, even when the mains voltage drops as low as 110V. Standard features are automatic on/off load sensing, real time battery efficiency testing, electronic residual current sensing on neutral and earth, RS232 serial output and RS232 computer interface. This latter interface enables remote access to the UPS for gathering a range of historical and operational data, for power analysis of both the mains and loads connected, the listing of op- erating anomalies and for providing details of the last battery operation. The series has been designed to handle high inrush currents, such as those associated with colour monitors, laser printers or other highly inductive loads, its overload perfor mance being 200% for five seconds. The smaller rated supplies will provide power for between 10 and 30 minutes, depending on load. For larger power ratings and when extended UPS time is required, up to 16 modular battery packs can be housed in a separate, matching cabinet. Battery operation times can then be extended to 150 minutes. For further information please contact John Thompson, Westinghouse Industrial Products, 179-185 Normanby Road, South Mel bourne, Vic 3205. Phone (03) 9676 8888, Fax (03) 9676 8777. Low-cost switchmode supplies Oatley Electronics have obtained a quantity of used but fully tested switchmode power supplies. Housed in a metal cabinet which measures 325 x 125 x 85mm, the supplies are rated to deliv er +5V at 8A, +12V at 3A and -12V at 250mA. They are fitted with Toroidal Transformers Harbuch Electronics Pty Ltd 9/40 Leighton Pl. HORNSBY 2077 Ph (02) 476-5854 Fx (02) 476-3231 an IEC mains socket, a mains switch, a small fan and flying leads for the DC outputs. For proper operation they need a minimum load of 250mA on the 12V supply. This could be an incandescent lamp. At $18 each or four for $60, with used IEC mains leads for $2.50 each, they will be of interest to many hobbyists. For further information, contact Oatley Electronics, PO Box 89, Oatley, NSW 2223. Phone (02)579 4985. Play CDs through your car radio Does your car lack a CD player? The SF100 Sound Feeder can change that. This compact device, which measures 90 x 51 x 21mm, allows you to feed signal from your portable CD or tape player through your car's stereo system. In operation, the Sound Feeder converts the audio from the player to an FM signal, which can be picked up by any FM car radio. The unit obtains its power from the cigarette lighter and can provide 4.5V, 6V or 9V to the CD player, to conserve its batteries. Any frequency in the FM band can be selected, using the band switch and tuning knob. The price is $47.95 and the unit is on sale at all Jaycar Electronics stores or their resellers. SC SILICON CHIP SOFTWARE Now available: the complete index to all SILICON CHIP articles since the first issue in November 1987. The Floppy Index comes with a handy file viewer that lets you look at the index line by line or page by page for quick browsing, or you can use the search function. All commands are listed on the screen, so you’ll always know what to do next. Notes & Errata also now available: this file lets you quickly check out the Notes & Errata (if any) for all articles published in SILICON CHIP. Not an index but a complete copy of all Notes & Errata text (diagrams not included). The file viewer is included in the price, so that you can quickly locate the item of interest. The Floppy Index and Notes & Errata files are supplied in ASCII format on a 3.5-inch or 5.25-inch floppy disc to suit PC-compatible computers. Note: the File Viewer requires MSDOS 3.3 or above. ORDER FORM PRICE ❏ Floppy Index (incl. file viewer): $A7 ❏ Notes & Errata (incl. file viewer): $A7 ❏ Alphanumeric LCD Demo Board Software (May 1993): $A7 ❏ Stepper Motor Controller Software (January 1994): $A7 ❏ Gamesbvm.bas /obj /exe (Nicad Battery Monitor, June 1994): $A7 ❏ Diskinfo.exe (Identifies IDE Hard Disc Parameters, August 1995): $A7 ❏ Computer Controlled Power Supply Software (Jan/Feb. 1997): $A7 ❏ Spacewri.exe & Spacewri.bas (for Spacewriter, May 1997): $A7 ❏ I/O Card (July 1997) + Stepper Motor Software (1997 series): $A7 POSTAGE & PACKING: Aust. & NZ add $A3 per order; elsewhere $A5 Disc size required:    ❏ 3.5-inch disc   ❏ 5.25-inch disc TOTAL $A Enclosed is my cheque/money order for $­A__________ or please debit my Bankcard   ❏ Visa Card   ❏ MasterCard ❏ Card No. Signature­­­­­­­­­­­­_______________________________ Card expiry date______/______ Name ___________________________________________________________ PLEASE PRINT Street ___________________________________________________________ Suburb/town ________________________________ Postcode______________ Send your order to: SILICON CHIP, PO Box 139, Collaroy, NSW 2097; or fax your order to (02) 9979 6503; or ring (02) 9979 5644 and quote your credit card number (Bankcard, Visa Card or MasterCard). ✂  15VA - 800VA ex-stock  10VA - 7.5kVA to order  low flux for audio use  E/S, flux band available  Standard or epoxy mount  Manufactured in Australia June 1995  85