Silicon ChipDecision trees and preamplifiers - June 1988 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Decision trees and preamplifiers
  4. Feature: The Way I See It by Neville Williams
  5. Feature: What is Negative Feedback? by Bryan Maher
  6. Vintage Radio: Cleaning up a vintage radio receiver by John Hill
  7. Project: Studio 200 Stereo Control Unit by Leo Simpson & Bob Flynn
  8. Serviceman's Log: Ring out the new, ring in the old by The Original TV Serviceman
  9. Project: Convert Your Car to Breakerless Ignition by Leo Simpson & John Clarke
  10. Project: Automatic Light Controller by Branco Justic
  11. Project: Mega-Fast Nicad Battery Charger by John Clarke & Greg Swain
  12. Feature: Amateur Radio by Garry Cratt, VK2YBX
  13. Subscriptions
  14. Feature: The Evolution of Electric Railways by Bryan Maher
  15. Feature: Digital Fundamentals, Pt.8 by Louis E. Frenzel
  16. Market Centre
  17. Advertising Index
  18. Outer Back Cover

This is only a preview of the June 1988 issue of Silicon Chip.

You can view 40 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:
  • The Way I See It (November 1987)
  • The Way I See It (December 1987)
  • The Way I See It (January 1988)
  • The Way I See It (February 1988)
  • The Way I See It (March 1988)
  • The Way I See It (April 1988)
  • The Way I See It (May 1988)
  • The Way I See It (June 1988)
  • The Way I See it (July 1988)
  • The Way I See It (August 1988)
  • The Way I See It (September 1988)
  • The Way I See It (October 1988)
  • The Way I See It (November 1988)
  • The Way I See It (December 1988)
  • The Way I See It (January 1989)
  • The Way I See It (February 1989)
  • The Way I See It (March 1989)
  • The Way I See It (April 1989)
  • The Way I See It (May 1989)
  • The Way I See It (June 1989)
  • The Way I See It (July 1989)
  • The Way I See It (August 1989)
  • The Way I See It (September 1989)
  • The Way I See It (October 1989)
  • The Way I See It (November 1989)
  • The Way I See It (December 1989)
Articles in this series:
  • What is Negative Feedback? (April 1988)
  • What is Negative Feedback? (June 1988)
  • What is Negative Feedback? (July 1988)
  • What Is Negative Feedback? (September 1988)
Items relevant to "Studio 200 Stereo Control Unit":
  • Silicon Chip article scan, July 1988 - Studio 200 Stereo Control Unit Pt2 (AUD $10.00)
  • Silicon Chip article scan, June 1988 - Studio 200 Stereo Control Unit Pt1 (AUD $10.00)
  • Silicon Chip article scan, June 1988 - Studio 200 Stereo Control Unit Pt1 (AUD $10.00)
Articles in this series:
  • Studio 200 Stereo Control Unit (June 1988)
  • Studio 200 Stereo Control Unit (July 1988)
  • Modifying The Studio 200 Amplifier (January 1990)
Articles in this series:
  • Amateur Radio (November 1987)
  • Amateur Radio (December 1987)
  • Amateur Radio (February 1988)
  • Amateur Radio (March 1988)
  • Amateur Radio (April 1988)
  • Amateur Radio (May 1988)
  • Amateur Radio (June 1988)
  • Amateur Radio (July 1988)
  • Amateur Radio (August 1988)
  • Amateur Radio (September 1988)
  • Amateur Radio (October 1988)
  • Amateur Radio (November 1988)
  • Amateur Radio (December 1988)
  • Amateur Radio (January 1989)
  • Amateur Radio (April 1989)
  • Amateur Radio (May 1989)
  • Amateur Radio (June 1989)
  • Amateur Radio (July 1989)
  • Amateur Radio (August 1989)
  • Amateur Radio (September 1989)
  • Amateur Radio (October 1989)
  • Amateur Radio (November 1989)
  • Amateur Radio (December 1989)
  • Amateur Radio (February 1990)
  • Amateur Radio (March 1990)
  • Amateur Radio (April 1990)
  • Amateur Radio (May 1990)
  • Amateur Radio (June 1990)
  • Amateur Radio (July 1990)
  • The "Tube" vs. The Microchip (August 1990)
  • Amateur Radio (September 1990)
  • Amateur Radio (October 1990)
  • Amateur Radio (November 1990)
  • Amateur Radio (December 1990)
  • Amateur Radio (January 1991)
  • Amateur Radio (February 1991)
  • Amateur Radio (March 1991)
  • Amateur Radio (April 1991)
  • Amateur Radio (May 1991)
  • Amateur Radio (June 1991)
  • Amateur Radio (July 1991)
  • Amateur Radio (August 1991)
  • Amateur Radio (September 1991)
  • Amateur Radio (October 1991)
  • Amateur Radio (November 1991)
  • Amateur Radio (January 1992)
  • Amateur Radio (February 1992)
  • Amateur Radio (March 1992)
  • Amateur Radio (July 1992)
  • Amateur Radio (August 1992)
  • Amateur Radio (September 1992)
  • Amateur Radio (October 1992)
  • Amateur Radio (November 1992)
  • Amateur Radio (January 1993)
  • Amateur Radio (March 1993)
  • Amateur Radio (May 1993)
  • Amateur Radio (June 1993)
  • Amateur Radio (July 1993)
  • Amateur Radio (August 1993)
  • Amateur Radio (September 1993)
  • Amateur Radio (October 1993)
  • Amateur Radio (December 1993)
  • Amateur Radio (February 1994)
  • Amateur Radio (March 1994)
  • Amateur Radio (May 1994)
  • Amateur Radio (June 1994)
  • Amateur Radio (September 1994)
  • Amateur Radio (December 1994)
  • Amateur Radio (January 1995)
  • CB Radio Can Now Transmit Data (March 2001)
  • What's On Offer In "Walkie Talkies" (March 2001)
  • Stressless Wireless (October 2004)
  • “Degen” Synthesised HF Communications Receiver (January 2007)
  • WiNRADiO: Marrying A Radio Receiver To A PC (January 2007)
  • PICAXE-08M 433MHz Data Transceiver (October 2008)
  • Half-Duplex With HopeRF’s HM-TR UHF Transceivers (April 2009)
  • Dorji 433MHz Wireless Data Modules (January 2012)
Articles in this series:
  • The Evolution of Electric Railways (November 1987)
  • The Evolution of Electric Railways (December 1987)
  • The Evolution of Electric Railways (January 1988)
  • The Evolution of Electric Railways (February 1988)
  • The Evolution of Electric Railways (March 1988)
  • The Evolution of Electric Railways (April 1988)
  • The Evolution of Electric Railways (May 1988)
  • The Evolution of Electric Railways (June 1988)
  • The Evolution of Electric Railways (July 1988)
  • The Evolution of Electric Railways (August 1988)
  • The Evolution of Electric Railways (September 1988)
  • The Evolution of Electric Railways (October 1988)
  • The Evolution of Electric Railways (November 1988)
  • The Evolution of Electric Railways (December 1988)
  • The Evolution of Electric Railways (January 1989)
  • The Evolution Of Electric Railways (February 1989)
  • The Evolution of Electric Railways (March 1989)
  • The Evolution of Electric Railways (April 1989)
  • The Evolution of Electric Railways (May 1989)
  • The Evolution of Electric Railways (June 1989)
  • The Evolution of Electric Railways (July 1989)
  • The Evolution of Electric Railways (August 1989)
  • The Evolution of Electric Railways (September 1989)
  • The Evolution of Electric Railways (October 1989)
  • The Evolution of Electric Railways (November 1989)
  • The Evolution Of Electric Railways (December 1989)
  • The Evolution of Electric Railways (January 1990)
  • The Evolution of Electric Railways (February 1990)
  • The Evolution of Electric Railways (March 1990)
Articles in this series:
  • Digital Fundamentals, Pt.1 (November 1987)
  • Digital Fundamentals, Pt.2 (December 1987)
  • Digital Fundamnetals, Pt.3 (January 1988)
  • Digital Fundamentals, Pt.4 (February 1988)
  • Digital Fundamentals Pt.5 (March 1988)
  • Digital Fundamentals, Pt.6 (April 1988)
  • Digital Fundamentals, Pt.7 (May 1988)
  • Digital Fundamentals, Pt.8 (June 1988)
  • Digital Fundamentals, Pt.9 (August 1988)
  • Digital Fundamentals, Pt.10 (September 1988)
SILICON CHIP Publisher & Editor-in-Chief Leo Simpson, B.Bus. Editor Greg Swain, B.Sc.(Hons.) Technical Staff John Clarke, B.E.(Elec.) Robert Flynn PUBUSHER'S u:·1-1'ER Advertising Manager Paul Buchtmann Regular Contributors Neville Williams, FIREE, VK2XV Bryan Maher, M.E. B.Sc. Jim Yalden, VK2YGY Garry Cratt, VK2YBX Jim Lawler, MTETIA David Whitby Photography Bob Donaldson Editorial Advisory Panel Philip Watson, MIREE, VK2ZPW Norman Marks Steve Payor, B.Sc., B.E SILICON CHIP is published 1 2 times a year by Silicon Chip Publications Pty Ltd. All material copyright (c) . No part of the contents of this publication · may be reproduced without prior written consent of the publisher. Kitset suppliers may not photostat articles without written permission of the publisher. Typesetting/makeup: Magazine Printers Pty Ltd , Waterloo, NSW 2017. Printing: Macquarie Publications Pty Ltd, Dubbo, NSW 2830. Distribution: Network Distribution Company. Subscription rates are currently $42 per year (12 issues). Out, side Australia the cost is $62 per year surface mail or $1 20 per y~ar air mail. Liability: 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. Address all mail to: Silicon Chip Publications Pty Ltd , PO Box 139, Collaroy Beach, NSW 2097. Phone (02) 982 3935. ISSN 1030-2662 • Recommended and maximum Australian price only. 2 SILICON CHIP Decision trees and preamplifiers It is quite surprising how, when a particular project has been designed for the magazine, a whole host of related applications then suggest themselves. Sometimes we can act immediately on these ideas; at other times they remain to be followed up later. The most recent example of this was when we designed the 50/lO0W module published in December 1987. No sooner had we published it than the idea of a higher-rated stereo power amplifier was mooted. The result was the Studio 200 power amplifier described in February 1988. And as soon as that hit the streets, we had readers clamouring for a matching stereo control preamplifier and other related projects. Luckily, we had foreseen the demand for a stereo control unit and started development work on it as soon as possible. The result appears in this issue, as part one of a two-part article. We're very proud of the Studio 200 Control Unit. Whether it will be hailed by the dyed-in-the-wool hifi enthusiast we don't know but it does bring together a number of highly desirable features. First of all, it uses a new low-noise dual op amp, the LM833, from National Semiconductor. This op amp not only has very low noise, but is also very cheap. Second, by using these LM833 op amps, we have been able to keep the circuit complexity to a pleasingly low level; just four dual op amps, four transistors and four diodes, plus the power supply components. As a result, the overall price of the control unit should be something of a benchmark for economy; a little over $200. Third, the overall performance is as good as or better then virtually any stereo preamp/power amp combination costing up to $3000 or more. By contrast, the overall cost of the Studio 200 preamp/power amp combo is going to be around $630. Just to focus on one aspect of performance, the unweighted signal to noise ratio for the high level inputs is 103dB or better. Very few amplifiers, regardless of price, offer this level of performance. That may seem surprising, but it's the kind of performance needed if the amplifier chain is not to degrade the signal quality from compact discs. Finally, the new control unit has an excellent headphone output with exactly the same level of performance. This is unusual for two reasons. Most stereo control units do not have headphone outputs at all and most integrated amplifiers give mediocre performance from their headphone sockets. This is the third in a series spawned by the original project published back in December 1987. We have quite a few to go before the series will be exhausted. When you consider all the projects we have published so far and all the possible project ideas that will flow from each of these, that's a lot of decision trees. How many projects will it mean over the next few years? Leo Simpson