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SILICON SILIC CHIP www.siliconchip.com.au Publisher & Editor-in-Chief Leo Simpson, B.Bus., FAICD Production Manager Greg Swain, B.Sc. (Hons.) Technical Editor John Clarke, B.E.(Elec.) Technical Staff Ross Tester Jim Rowe, B.A., B.Sc Nicholas Vinen Photography Ross Tester Reader Services Ann Morris Advertising Enquiries Glyn Smith Phone (02) 9939 3295 Mobile 0431 792 293 glyn<at>siliconchip.com.au Regular Contributors Brendan Akhurst Rodney Champness, VK3UG Kevin Poulter Stan Swan Dave Thompson SILICON CHIP is published 12 times a year by Silicon Chip Publications Pty Ltd. ACN 003 205 490. ABN 49 003 205 490. All material is copyright ©. No part of this publication may be reproduced without the written consent of the publisher. Printing: Hannanprint, Noble Park, Victoria. Distribution: Network Distribution Company. Subscription rates: $97.50 per year in Australia. For overseas rates, see the order form in this issue. Editorial office: Unit 1, 234 Harbord Rd, Brookvale, NSW 2100. Postal address: PO Box 139, Collaroy Beach, NSW 2097. Phone (02) 9939 3295. Fax (02) 9939 2648. E-mail: silicon<at>siliconchip.com.au ISSN 1030-2662 Recommended and maximum price only. 2  Silicon Chip Publisher’s Letter Mains surge suppressors are not a condition of electronic product warranties Because my friends and acquaintances know that I am involved with the production of an electronics magazine, they sometimes ask me what is my recommendation of brand and model of TV, video projector, DVD player, audio amplifier, loudspeaker or in fact, just about any electronic or electrical equipment. Now unless one spent all day, every day checking the specs and performance of such equipment, it is just not possible to make specific recommendations; the models seem to change on a daily basis! On the other hand, if they ask about a particular brand and model, I can perhaps be more helpful and possibly guide them in their purchase by asking what features they need, suggesting that they might look at an alternative approach, such as a high-quality BluRay player instead of a CD player or maybe look at a home-theatre receiver with 5.1 channels rather than a run-of-the-mill stereo amplifier. Sometimes I can refer them to the makers’ websites or to government websites for more detailed info they should have before making a decision. And often I won’t hear anything more about it. Sometimes they will tell me what they finally purchased and sometimes the product is far more expensive and up-market than they were originally intending to buy. If they are happy and the product performs as they expect, then all is well. But then those same people will tell me that they also purchased an extended warranty, an HDMI cable or two and a surge suppressor, with the comment that the surge suppressor was necessary to get the extended warranty. And that’s when I feel that the whole process has gone awry. Now I know that retail is a tough scene and that retailers often seek to up-sell as much as they can, in order to survive. Nor do I disagree with the concept of extended warranties. Given that service charges can be a major proportion of a replacement TV, then an extended warranty can be worthwhile. But the idea that a surge suppressor is required for a warranty to be valid is just false. If any retailer tried that on with me, I would demand to see where it was in the warranty document. Of course, it won’t be there. Nor can there be any suggestion that the manufacturer’s warranty specifies the need for a surge suppressor. If that was a condition of the warranty then it would be arguable that the product was not “of merchantable quality”. In other words, the product would not work reliably unless it was plugged in via a particular surge suppressor. Well, that’s just nonsense. If a product is sold in Australia, then it must work in Australia and cope with the normal range of AC mains voltages present in Australia. To suggest otherwise is an indication that the retailer concerned is selling dodgy products. In any case, while a surge suppressor may do no harm and may provide some protection against transient voltages on the AC mains supply, it will be no help in the case of a lightning strike. As any appliance serviceman can attest, the most effective way to protect electronic equipment from lightning is for it to be switched off and unplugged from everything: the 230VAC mains, modem and ethernet connection, TV and cable and so on. Even then, there is no guarantee that equipment won’t be damaged – lightning is like that. So if you do decide to buy a big-ticket electronic item, just be aware that the retailer may try to “up-sell” you. Don’t be caught. And shop around for those HDMI cables and other accessories; the chances are that you can purchase them much cheaper elsewhere. Leo Simpson siliconchip.com.au