Silicon ChipYour future electric car may use ultracapacitors - April 2008 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Your future electric car may use ultracapacitors
  4. Feature: Beyond The Capacitor There Is The Ultracapacitor by Ross Tester
  5. Feature: How To Get Into Digital TV, Pt.2 by Alan Hughes & Leo Simpson
  6. Project: Charge Controller For 12V Lead-Acid Or SLA Batteries by John Clarke
  7. Project: A Safe Flash Trigger For Your Digital SLR Camera by Ross Tester
  8. Project: 12V-24V High-Current DC Motor Speed Controller, Pt.2 by Mauro Grassi
  9. Project: Two-Way Stereo Headphone Adaptor by Mauro Grassi
  10. Vintage Radio: Shortwave converters from the 1930s by Rodney Champness
  11. Book Store
  12. Advertising Index
  13. Order Form

This is only a preview of the April 2008 issue of Silicon Chip.

You can view 29 of the 96 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.

Articles in this series:
  • How To Get Into Digital TV (March 2008)
  • How To Get Into Digital TV (March 2008)
  • How To Get Into Digital TV, Pt.2 (April 2008)
  • How To Get Into Digital TV, Pt.2 (April 2008)
Items relevant to "Charge Controller For 12V Lead-Acid Or SLA Batteries":
  • 12V Lead-Acid Charge Controller PCB [14104081] (AUD $12.50)
  • PIC16F88-I/P programmed for the 12V Battery Charge Controller [1410408A.HEX] (Programmed Microcontroller, AUD $15.00)
  • PIC16F88 firmware and source code for the 12V Lead-Acid or SLA Battery Charge Controller [1410408A.HEX] (Software, Free)
  • 12V Lead-Acid or SLA Battery Charge Controller PCB pattern (PDF download) [14104081] (Free)
  • 12V Lead-Acid or SLA Battery Charge Controller front panel artwork (PDF download) (Free)
Items relevant to "12V-24V High-Current DC Motor Speed Controller, Pt.2":
  • PIC16F88-I/P programmed for the DC Motor Speed Controller [0910308A.HEX] (Programmed Microcontroller, AUD $15.00)
  • PIC16F88 firmware and source code for the 12-24V High Current Motor Speed Controller [0910308A.HEX] (Software, Free)
  • 12-24V High-Current Motor Speed Controller main PCB pattern (PDF download) [09103081] (Free)
  • 12-24V High-Current Motor Speed Controller display PCB pattern (PDF download) [09103082] (Free)
Articles in this series:
  • 12V-24V High-Current DC Motor Speed Controller, Pt.1 (March 2008)
  • 12V-24V High-Current DC Motor Speed Controller, Pt.1 (March 2008)
  • 12V-24V High-Current DC Motor Speed Controller, Pt.2 (April 2008)
  • 12V-24V High-Current DC Motor Speed Controller, Pt.2 (April 2008)
Items relevant to "Two-Way Stereo Headphone Adaptor":
  • Stereo Headphone Adaptor PCB [01104081] (AUD $15.00)
  • Two-Way Stereo Headphone Adaptor PCB pattern (PDF download) [01104081] (Free)
  • Two-Way Stereo Headphone Adaptor front panel artwork (PDF download) (Free)
  • Two-Way Stereo Headphone Adaptor rear panel artwork (PDF download) (Free)

Purchase a printed copy of this issue for $10.00.

SILICON CHIP www.siliconchip.com.au Publisher & Editor-in-Chief Leo Simpson, B.Bus., FAICD Production Manager Greg Swain, B.Sc.(Hons.) Technical Staff John Clarke, B.E.(Elec.) Ross Tester Jim Rowe, B.A., B.Sc, VK2ZLO Mauro Grassi, B.Sc.(Hons.) 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 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 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: $89.50 per year in Australia. For overseas rates, see the subscription page 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 Your future electric car may use ultracapacitors As it says in one of the letters in Mailbag this month, electric cars are coming. Or at the very least, they are coming closer. A recent issue of The Wall Street Journal reported that General Motors and Toyota are now punting on electric cars rather than hydrogen power. Good thing too. We have always thought that fuel cells and hydrogen were a distraction from the main game because fuel cells are very expensive and the distribution and storage of hydrogen was always going to be a major problem. Part of the change of heart has come about due to recent advances in Lithium-ion batteries whereby future electric cars might have a range of up to 500km before they need to recharge. With a potential range of 500km, car makers will no longer be able to argue that people won’t buy electric cars because they cannot go far enough on a single charge. At the same time, Nissan has just announced that it will release an electric car in 2010. Will it be along the same lines as the Nissan Mixim concept car? Probably not but you can be sure that it will use some of the same technology, with Lithium-ion batteries and a similar power-train. Mitsubishi has also indicated that it will sell an electric sports car. GM will also release its Chevrolet Volt electric car but since it has a small on-board petrol generator to top up the battery for long drives, we don’t think it is a full-on electric car – it’s a “pretend” one. It is really just a further refinement of hybrid electric vehicles like the Toyota Prius or Honda Civic. Why don’t they revisit the EVA-1 with Lithium-ion batteries? However, the latest really interesting development is highlighted with the article on ultracapacitors in this issue (page 12). In themselves, ultra­ capacitors are mind-boggling because of the sheer values of capacitance now being achieved. Years ago, the standard unit of capacitance, the Farad, was always regarded as an academic curiosity, something that would never be a practical device. Yet we are now talking about capacitances of 1000 Farads and huge energy storage. For anyone who has played with a typical supercapacitor over the last few years, this is an amazing shift. For example, if you have tested how much energy can be stored in a 1 Farad 5.5V supercapacitor (15 Joules), you will know that it is fine for lighting LEDs and powering low-current circuits but compared to a couple of NiMH AA cells, it is like the proverbial 110 pound weakling on the beach! (Oh, and before the metric thought police come to take me away in shackles, is there a better comparison?) So it is even more amazing just how much energy can now be stored in banks of ultracapacitors. We are now talking about the same amount of energy as would be required for a practical electric car – 30 kilowatt-hours or more. This could be used on its own or combined with a large rechargeable battery bank. Ultracapacitors are even being tried out in electric buses. And it turns out that our very own CSIRO has been researching this area for quite a few years, as reported in our story in this issue. So the developments are coming thick and fast. In fact, next month we will be reviewing the first really practical electric vehicle for consumer use. It is already available in Australia and they are selling fast. Leo Simpson siliconchip.com.au