Silicon ChipContents - April 2011 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Nuclear power now not likely in Australia
  4. Feature: Can Earthquakes Be Predicted By VLF Radio Signals? by Stan Swan
  5. Feature: The Rise & Fall Of Electronics Today International by Collyn Rivers
  6. Project: Portable Headphone Amplifier For MP3 Players by Nicholas Vinen
  7. Project: Fixing Transformer Buzz In The Class-A Amplifier by Leo Simpson
  8. Project: Cheap’n’Simple 100V Speaker/Line Checker by Ross Tester
  9. A Speed Controller For Film Projectors by John Clarke
  10. Review: Agilent’s InfiniiVision 4-Channel Oscilloscopes by Nicholas Vinen
  11. Project: The Maximite Computer, Pt.2 by Geoff Graham
  12. Book Store
  13. Vintage Radio: The 1939 STC 504 5-valve table radio by Rodney Champness
  14. Advertising Index
  15. Outer Back Cover

This is only a preview of the April 2011 issue of Silicon Chip.

You can view 35 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 "Portable Headphone Amplifier For MP3 Players":
  • Portable Stereo Headphone Amplifier PCB [01104111] (AUD $10.00)
  • Headphone Amplifier for iPods and MP3 Players PCB pattern (PDF download) [01104111] (Free)
  • Headphone Amplifier for iPods and MP3 Players panel artwork (PDF download) (Free)
Items relevant to "Fixing Transformer Buzz In The Class-A Amplifier":
  • 20W Class-A Amplifier Power Supply PCB [01105074] (AUD $20.00)
Items relevant to "Cheap’n’Simple 100V Speaker/Line Checker":
  • 100V Speaker/Line Checker PCB [04104111] (AUD $15.00)
  • 100V Speaker/Line Checker PCB pattern (PDF download) [04104111] (Free)
Items relevant to "A Speed Controller For Film Projectors":
  • Projector Speed Controller PCB [13104111] (AUD $10.00)
  • PIC16F88-I/P programmed for the Projector Speed Controller [1310411A.HEX] (Programmed Microcontroller, AUD $15.00)
  • Firmware and source code for the Speed Controller for Film Projectors [1310411A.HEX] (Software, Free)
  • Speed Controller for Film Projectors PCB pattern (PDF download) [13104111] (Free)
Items relevant to "The Maximite Computer, Pt.2":
  • Maximite PCB [06103111] (AUD $15.00)
  • PIC32MX695F512H-80I/PT programmed for the Maximite/miniMaximite (V2.7) (Programmed Microcontroller, AUD $30.00)
  • CP2102-based USB/TTL serial converter with 5-pin header and 30cm jumper cable (Component, AUD $5.00)
  • MaxiMite Firmware v4.1, documentation, libraries, sample software, serial port driver and sprint/font editor (Free)
  • MaxiMite Microcomputer PCB pattern (PDF download) [06103111] (Free)
Articles in this series:
  • The Maximite Computer, Pt.1 (March 2011)
  • The Maximite Computer, Pt.2 (April 2011)
  • The Maximite Computer, Pt.3 (May 2011)

Purchase a printed copy of this issue for $10.00.

Contents Vol.24, No.4; April 2011 SILICON CHIP www.siliconchip.com.au Features 14 Can Earthquakes Be Predicted By VLF Radio Signals? Low-frequency RF signals may indicate the onset of earthquakes. Here’s a lowfrequency preamplifier that plugs into your PC’s sound card – by Stan Swan 22 The Rise & Fall Of Electronics Today International Launched 40 years ago this month, “Electronics Today” (later ETI) caused quite a stir at the time and gave “Electronics Australia” a run for its money. The magazine’s founding editor tells its story – by Collyn Rivers 70 Review: Agilent’s InfiniiVision 4-Channel Oscilloscopes Portable Headphone Amplifier For MP3 Players – Page 28. These new high-performance scopes from Agilent feature a wide screen format, have a good range of facilities and are easy to use – by Nicholas Vinen Pro jects To Build 28 Portable Headphone Amplifier For MP3 Players Fed up with the sound from your MP3 player? Build this high-quality portable headphone amplifier and be amazed at the difference – by Nicholas Vinen 40 Fixing Transformer Buzz In The Class-A Amplifier Quite a few constructors have had problems with transformer buzz in the 20W Class-A Stereo Amplifier. The cure is surprisingly simple – by Leo Simpson 44 Cheap’n’Simple 100V Speaker/Line Checker This simple project will be a boon to anyone setting up 100V PA systems. It lets you check each PA speaker and line as it is run – by Ross Tester Fixing Transformer Buzz In The Class-A Stereo Amplifier – Page 40. 62 A Speed Controller For Film Projectors Transfer your old home movies to DVD before it’s too late! This simple PICbased speed controller lets you synchronise the film frame rate with your camcorder to avoid serious flicker – by John Clarke 86 The Maximite Computer, Pt.2 Last month, we introduced our new PIC-32-based microcomputer and gave the circuit details. Now for the fun part: building it (and yes, Altronics has kits) – by Geoff Graham Special Columns Cheap’n’Simple 100V Speaker/ Line Checker – Page 44. 44. 57 Serviceman’s Log Thanks for the dodgy memory (not) – by the Serviceman 77 Circuit Notebook (1) Mains Timer For Battery Chargers; (2) Chirp Suppressor For A Car Alarm; (3) PIC-Based Square-Wave Generator; (4) H-Bridge Circuits For Robotics; (5) LED Light Controller PIC-Based Speed Controller For Film Projectors – Page 62. 94 Vintage Radio The 1939 STC 504 5-valve table radio – by Rodney Champness Departments   2   4 27 91 Publisher’s Letter Mailbag Book Review Order Form siliconchip.com.au 99 Ask Silicon Chip 102 Notes & Errata 103 Market Centre April 2011  1