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Publisher & Editor-in-Chief Leo Simpson, B.Bus. Editor Greg Swain, B.Sc.(Hons.) Technical Staff John Clarke, B.E.(Elec.) Robert Flynn Rick Walters Reader Services Ann Jenkinson Advertising Enquiries Leo Simpson Phone (02) 9979 5644 Regular Contributors Brendan Akhurst Garry Cratt, VK2YBX Marque Crozman, VK2ZLZ Julian Edgar, Dip.T.(Sec.), B.Ed John Hill Jim Lawler, MTETIA Philip Watson, MIREE, VK2ZPW Jim Yalden, VK2YGY Bob Young Photography Stuart Bryce SILICON CHIP is published 12 times a year by Silicon Chip Publications Pty Ltd. A.C.N. 003 205 490. All material copyright ©. No part of this publication may be reproduced without the written consent of the publisher. Printing: Macquarie Print, Dubbo, NSW. Distribution: Network Distribution Company. Subscription rates: $49 per year in Australia. For overseas rates, see the subscription page in this issue. Editorial & advertising offices: Unit 34, 1-3 Jubilee Avenue, Warrie­ wood, NSW 2102. Postal address: PO Box 139, Collaroy Beach, NSW 2097. Phone (02) 9979 5644. Fax (02) 9979 6503. PUBLISHER'S LETTER Keep those letters coming In the routine of producing SILICON CHIP every month it is easy to become disenchanted with the workload and sometimes we might wonder if all the detail work is really worth it. This is especially the case as we get close to the final deadlines and everything has to be delivered to the printer. These thoughts were prompted by two items of mail which arrived on my desk this morning. One was a note from a reader which he included with his twoyear subscription renewal. It was just a few words of appre­ciation about the magazine and how he enjoys it. The other item was a large postcard from New Zealand from a reader who had just received one of our project books. Again, he was very complimen­tary. Now both of these items gave me a real buzz. They were timely because they arrived at the peak pressure time and they were especially appreciated because they give the feeling that the close attention to detail by all the magazine staff is really worthwhile. To those two readers and all of you who pass on these remarks of appreciation from time to time, thanks very much. All of which is a comment on the whole subject of corre­spondence with which we have a love/hate relationship. The mail seems to come in waves. Sometimes we are overwhelmed with the volume of it and wonder what has moved so many people to suddenly write and order various items, to ask for circuits and so on. We then have a battle to catch up with it, especially if it has arrived at close to deadlines and editorial work has taken prece­dence. That explains the “hate” part of the love/hate relation­ship – we hate trying to catch up with it. At other times the mail might slow to a dribble and we again wonder why everybody has gone quiet. At those times, we would “love” to receive more mail. Apart from giving us a feeling that we’re appreciated, your letters can help make the magazine better and give you more of what you want. Many articles and circuits that appear in SILICON CHIP are the result of suggestions by readers. We can’t always help with your queries but we do manage to respond positively in most cases. So please feel free to write in, make comments on the maga­zine content or on topics of current interest, contribute cir­cuits for publication or request information on circuits that have been published. We respond as quickly as we can and most orders for back issues and other products are sent out on the same day. Leo Simpson ISSN 1030-2662 WARNING! SILICON CHIP magazine regularly describes projects which employ a mains power supply or produce high voltage. All such projects should be considered dangerous or even lethal if not used safely. Readers are warned that high voltage wiring should be carried out according to the instructions in the articles. When working on these projects use extreme care to ensure that you do not accidentally come into contact with mains AC voltages or high voltage DC. If you are not confident about working with projects employing mains voltages or other high voltages, you are advised not to attempt work on them. Silicon Chip Publications Pty Ltd disclaims any liability for damages should anyone be killed or injured while working on a project or circuit described in any issue of SILICON CHIP magazine. Devices or circuits described in SILICON CHIP may be covered by patents. SILICON CHIP disclaims any liability for the infringement of such patents by the manufacturing or selling of any such equipment. SILICON CHIP also disclaims any liability for projects which are used in such a way as to infringe relevant government regulations and by-laws. Advertisers are warned that they are responsible for the content of all advertisements and that they must conform to the Trade Practices Act 1974 or as subsequently amended and to any governmental regulations which are applicable. 2  Silicon Chip