Silicon ChipMarket Centre - April 1988 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Those wonderful op amps; they're so versatile
  4. Vintage Radio: How it Began by John Hill
  5. Feature: What is Negative Feedback? by Bryan Maher
  6. Feature: The Way I See It by Neville Williams
  7. Project: Headphone Amplifier for CD Players by John Clarke
  8. Project: Walkaround Throttle for Model Railroads by Leo Simpson & John Clarke
  9. Project: Build a Slave Flash Trigger by John Clarke & Greg Swain
  10. Serviceman's Log: Beating an intermittent by The Original TV Serviceman
  11. Project: A pH Meter For Swimming Pools by John Clarke & Leo Simpson
  12. Subscriptions
  13. Feature: Amateur Radio by Garry Cratt, VK2YBX
  14. Feature: The Evolution of Electric Railways by Bryan Maher
  15. Feature: Digital Fundamentals, Pt.6 by Louis E. Frenzel
  16. Market Centre
  17. Advertising Index
  18. Outer Back Cover

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

You can view 42 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:
  • Vintage Radio: How it Began (March 1988)
  • Vintage Radio: How it Began (April 1988)
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)
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)
Items relevant to "Walkaround Throttle for Model Railroads":
  • Silicon Chip article scan, April 1988 - Walkaround Throttle For Model Railroads Pt 1 (AUD $10.00)
  • Silicon Chip article scan, May 1988 - Walkaround Throttle For Model Railroads Pt 2 (AUD $10.00)
  • Silicon Chip article scan, April 1988 - Walkaround Throttle For Model Railroads Pt 1 (AUD $10.00)
Articles in this series:
  • Walkaround Throttle for Model Railroads (April 1988)
  • Walkaround Throttle for Model Railroads, Pt.2 (May 1988)
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)
T CEli'I' Cash in your surplus gear. Advertise it here in Silicon Chip. Advertising rates for this page: Classified ads - $7.00 for up to 15 words plus 40 cents for each additional word; Display ads (casual rate) - $20 per column centimetre (max. 10cm). Closing date: five weeks prior to month of sale. If you use a PO Box number, you must include your permanent address and phone number for our files. We cannot accept ads submitted without this information. To run your own classified ad, put one word on each of the lines below and send this form with your payment to: Silicon Chip Classifieds, PO Box 139, Collaroy Beach , NSW 2097. PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ($7.00) 16 ($7.40) 17 ($7.80) 18 ($8.20) 19 ($8.60) 20 ($9.00) 21 ($9.40) 22 ($9.80) 23 ($10.20) 24 ($10.60) 25 ($11.00) Name ....... .. .... .... ..... .......... ..... ......... .. .. ........ .. .. .. .. .. ........ ..... .... ..... ...... .......... ... ...... . Address .. .. .... ... ... .. ... .. .. ....... ........... .. ... ..... ..... ....... ..... .......... .... ..... ........ ..... .. .... ..... . Suburb/Town .. .. .. .. . .. .. .. . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . .. .. Postcode ........ .. Enclosed is my cneque or money order for$ ........ ... .... .. .. ........ .......... or please debit my Bankcard □ Visa □ Advertisers Index Our advertisers are vital to the success of SILICON CHIP. Please give them your support. Altronics .. .. ................ .... 70-73 Arista Electronics .............. .. . 1 9 Avtek ................................ IBC Dick Smith Electronics .... 52 ,53, 84 ,85 Elmeasco .. ..... .. ......... ....... . IFC Geoff Wood Electronics ... 41 -4 7 Jaycar Electronics .......... 20-27 Kenwood Australia ..... ....... OBC RCS Radio .......................... 92 Rod Irving Electronics .. .... ..... .. 9 PC Boards Printed circuit boards for SILICON CHIP projects are made by: • RCS Radio Pty Ltd , 651 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491. • Jemal Products, 5 Forge St, Kewd.ale, WA 6105 . Phone (09) 451 8726 . Card No ...... ....... .... .... .... ... ..... ... .. ..... .... ..... ........ .... ...... ..... ....... ..... ..... .. . Signature ..... .... .. .. .... ..... ............ .... ....... ................ ....... ... .... ..... .. .... ......... ............. . FOR SALE NEARLY 1500 PRINTER buffer kits now sold. Prices start at $39 for a 256K short form kit. All items advertised are in stock. Dealer enquiries welcome . Bulk discounts. Schools, Govt. Depts. orders accepted. Oh yes!! IBM compatible . Australian designed and manufactured. Ideal project for user groups or students. For a free catalog send a 37c stamp to : Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. SHACK CLEAROUT . R1000 Kenwood Receiver with box and instructions. As new- $300 . HX 2000 Regency scan ner $200; Ranger AR3300 HF transceiver, 26-30MHz, 25W PEP, AM-SSB-CW-FM, $250; Marconi signal generator TF995 with spares $100; 2 x UHF CB Uniden Sundowner with CTCSS modules fitted , $200 each; 9dB base station antenna $90; 6dB base station antenna $60; Ratcliff 96 SILI CON Cl-Ill' signal generator Model 205 (45 - 180MHz) $50. All prices negotiable. Ring (02) 487 1439 after 8pm evenings and weekends . Garry VK2YBX. FOR SALE: ETI SERIES 5000 preamplifier, $320. 1/3-octave graphic equalisers, $160 each . Phone (02) 542 3628 after 5pm . Amateur Radio continued from page 69 which is wrapped around the top of the loading coil. Figs.1 & 2 show the details. This construction technique must be followed exactly, otherwise the resonant frequency will be other than that which is desired. In any case, a GDO (grid dip oscillator) should be used to verify the correct frequency of operation, after the antenna is mounted on the vehicle. After the coil has been wound .and the coupling "capacitor" installed, the PVC shroud can be glued in place and the top of the coil soldered to the top metal fitting. As the 1/2-wave whip mounting technique is quite strong, it is suitable for either VHF or UHF antennas. ~ Negative Feedback continued from page 14 pected to have the theory as a set of differential equations. Let's leave our young enthusiasts before they get too far ahead of us. Clearly they must be the brightest building site observers ever. One point is clear though. When they have fully developed their theory of feedback systems, it will be a truly general set of equations. Next month, we will show you more of this fascinating stuff, but we will naturally accent the electronic side of this beaut story. And we will be very down-to-earth and practical to boot. ~