Silicon ChipToday's TV - brilliant pictures, mediocre sound - July 2010 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Today's TV - brilliant pictures, mediocre sound
  4. Feature: Electronics Goes Boating by Kevin Poulter
  5. Feature: 3DTV: From Stadium To Living Room by Nicholas Vinen
  6. Feature: Programming PIC Microcontrollers: How It’s Done by Mauro Grassi
  7. Project: An Intelligent 12V Fan Controller by Geoff Graham
  8. PICAXE Project Development System by Jeff Monegal
  9. Project: Lab-Standard 16-Bit Digital Potentiometer by Jim Rowe
  10. Project: Dual-Tracking ±19V Power Supply, Pt.2 by Nicholas Vinen
  11. Vintage Radio: Reflex receivers: why they were necessary by Rodney Champness
  12. Advertising Index
  13. Outer Back Cover

This is only a preview of the July 2010 issue of Silicon Chip.

You can view 28 of the 104 pages in the full issue, including the advertisments.

For full access, purchase the issue for $10.00 or subscribe for access to the latest issues.

Items relevant to "An Intelligent 12V Fan Controller":
  • Intelligent 12V Fan Controller PCB [18107101] (AUD $5.00)
  • PIC18F2550-I/SP programmed for Intelligent 12V Fan Controller [1810710A.HEX] (Programmed Microcontroller, AUD $20.00)
  • Firmware and PC software plus source code for the Intelligent 12V Fan Controller [1810710A.HEX] (Free)
  • Intelligent 12V Fan Controller PCB pattern (PDF download) [18107101] (Free)
Items relevant to "PICAXE Project Development System":
  • BASIC source code for the PICAXE Project Development System (Software, Free)
Items relevant to "Lab-Standard 16-Bit Digital Potentiometer":
  • Lab-Standard 16-Bit Digital Potentiometer PCB [04107101] (AUD $20.00)
  • PIC16F877A-I/P programmed for the 16-Bit Digital Potentiometer [0410710A.HEX] (Programmed Microcontroller, AUD $20.00)
  • PIC16F877A firmware and source code for the Lab-standard 16-bit Digital Potentiometer [0410710A.HEX] (Software, Free)
  • Lab-Standard 16-bit Digital Potentiometer PCB pattern (PDF download) [04107101] (Free)
  • Lab-Standard 16-bit Digital Potentiometer front panel artwork/drilling template (PDF download) (Free)
Items relevant to "Dual-Tracking ±19V Power Supply, Pt.2":
  • Dual Tracking ±0-19V Power Supply PCB [04206101] (AUD $15.00)
  • Dual Tracking ±0-19V Power Supply front panel PCB [04206102] (AUD $5.00)
  • Dual Tracking ±0-19V Bench Supply PCB patterns (PDF download) [04206101/2/3] (Free)
  • Dual Tracking ±0-19V Supply panel artwork/drilling templates (mains-powered) (PDF download) (Free)
  • Dual Tracking ±0-19V Supply panel artwork/drilling templates (plugpack-powered) (PDF download) (Free)
Articles in this series:
  • Dual-Tracking ±19V Power Supply, Pt.1 (June 2010)
  • Dual-Tracking ±19V Power Supply, Pt.1 (June 2010)
  • Dual-Tracking ±19V Power Supply, Pt.2 (July 2010)
  • Dual-Tracking ±19V Power Supply, Pt.2 (July 2010)

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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 Mauro Grassi, B.Sc. (Hons), Ph.D 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 Mike Sheriff, B.Sc, VK2YFK Stan Swan 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: $94.50 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 Today’s TV – brilliant pictures, mediocre sound One of our correspondents in this month’s Mailbag pages bemoans the fact that his latest whiz-bang flatscreen TV does not have analog audio outputs. That is part of a larger complaint that the sound quality from his huge TV set’s teeny rear-firing loudspeakers is distinctly poor. In fact, as far as we can determine, all large LCD and plasma panel TV sets do not have any sort of analog audio outputs which you could otherwise connect to a decent stereo system. Instead, they usually have a TOSLINK optical output which is evidently intended to be connected to an audio system which has optical inputs and a digital-to-analog converter (DAC). There are two possible reasons why modern sets lack analog audio outputs. The first is technical, in that such sets probably don’t have any analog signals anywhere in the chassis, with even the audio amplifiers being fully digital. The second reason is marketing, in that it gives the retailer the opportunity to “up-sell” the TV buyer to a companion home-theatre sound system which might be 5.1 channels, 6 channels, 7.2 channels or you name it. That’s all very well for the retailer and it does solve the problem of poor TV sound while also providing for remote control of the sound via a universal remote. The problem is that many people, probably most, don’t really want the extra five, six or more speaker boxes it takes to go with their big TV set. Let’s face it, many rooms are simply not suited to a surround sound system, whether the speakers be conventional black cabinets, futuristic silver towers or whatever. And when you get right down to it, most of these surround sound systems are pretty ordinary anyway; with better sound than the TV set but not outstanding. That is what you should expect in any case because if a system costs less than $1000 yet has a large number of speakers, plus an in-built DVD player, FM tuner and other facilities, they simply cannot be top quality. A pair of good-quality fullrange loudspeakers can easily exceed $1000 so a complete home-theatre system costing that or less is bound to be inferior. Furthermore, I believe that for the vast majority of TV and video programming, surround sound is simply unnecessary. Yes, it might add something to a few “action” movies but otherwise, all those speakers are useless clutter in most lounge rooms. That is not to say that the sound quality in today’s movies and TV dramas is not good. Some of it is very good, especially from those programs produced under the auspices of the BBC. But all you need to enjoy that magnificent wide range sound is a decent stereo amplifier and a pair of equally good full-range loudspeakers. And nor is it necessary to include a separate powered subwoofer – if the main speakers are any good. Whenever I see a subwoofer in use I know that the main speakers are probably deficient in the lower bass and probably the rest of the audible spectrum as well. So where does that leave our correspondent with his complaint about his new TV? At the moment there is no really satisfactory answer unless you decide to purchase a top-quality stereo or home-theatre system which will cost thousands of dollars. If he already has a good-quality stereo system, the best approach to obtain good-quality sound is to build the High-Quality Stereo DAC project featured in SILICON CHIP last year. Certainly, that solution is not available to most consumers unless an expensive commercial unit is purchased. The vast majority of people are short-changed as far as sound quality is concerned – but then that applies to all entertainment, not just TV and video. The sad fact is that most people these days simply do not know how good a high-quality sound system can be. SILICON CHIP readers are fortunate in that respect. Leo Simpson siliconchip.com.au