This is only a preview of the July 2011 issue of Silicon Chip. You can view 30 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. Articles in this series:
Items relevant to "Ultra-LD Mk.3 200W Amplifier Module":
Items relevant to "A Portable Lightning Detector":
Items relevant to "Rudder Position Indicator For Power Boats":
Items relevant to "A Look At Amplifier Stability & Compensation":
Items relevant to "Build A Voice-Activated Relay (VOX)":
Purchase a printed copy of this issue for $10.00. |
Contents
SILICON
CHIP
www.siliconchip.com.au
Vol.24, No.7; July 2011
Features
14 Australia Hears . . . And So Do I
New digital hearing aids developed in Australia are now available for a fraction
of the cost of other aids. You can even program them yourself – by Ross Tester
21 Could There Be A SIM-LEI Electric Car In Your Future?
The evolution of electric cars continues. This one has in-wheel motors, does
0-100km/h in just 4.8s and has a range of 300km plus – by Ross Tester
22 Control Your World Using Linux
PCs running Linux are quite open to the experimenter. Here’s how to use your
computer to control external equipment – by Nenad Stojadinovic
72 A Look At Amplifier Stability & Compensation
Ultra-LD Mk.3 200W
Amplifier Module – Page 30.
Portable Lightning
Detector – Page 42.
The Ultra-LD Mk3 amplifier described in this issue has a new frequency
compensation arrangement to lower distortion. We explain why amplifier
frequency compensation is necessary and how it works – by Nicholas Vinen
Pro jects To Build
30 Ultra-LD Mk.3 200W Amplifier Module
Upgraded design has even lower distortion than before. It also boasts much
improved thermal stability, has a flatter frequency response and can deliver
135W RMS into 8Ω or 200W RMS into 4Ω – by Nicholas Vinen
42 A Portable Lightning Detector
This device could literally save your life. It gives advance warning of
approaching thunderstorms, giving you time to take shelter if out in the open
or to disconnect valuable gear from the mains if at home – by John Clarke
62 Rudder Position Indicator For Power Boats
Easy-to-build unit senses the rudder position and sends the information to a
companion receiver unit via a 433MHz RF link – by Nicholas Vinen
82 Build A Voice-Activated Relay (VOX)
Turn devices on or off by speaking (or by using some other sound) with this
simple VOX circuit. It features adjustable sensitivity and delay– by John Clarke
Special Columns
57 Serviceman’s Log
Restarting after the Christchurch earthquake – by the Serviceman
87 Circuit Notebook
(1) Surf Sound Synthesiser; (2) Geiger Counter Uses Cockroft-Walton
Multiplier; (3) PICAXEL The Electronic Cricket; (4) Wein Bridge Oscillator
Uses An LM386 Power Amplifier; (5) Synthetic 5-Segment Potentiometer
Rudder Position Indicator For
Power Boats – Page 62.
62.
92 Vintage Radio
Hotpoint Bandmaster J35DE console radio, Pt.1 – by Maurie Findlay
Departments
2
4
40
98
Publisher’s Letter
Mailbag
Product Showcase
Ask Silicon Chip
siliconchip.com.au
101 Notes & Errata
102 Order Form
103 Market Centre
Build A Voice-Activated
Relay – Page 82.
July 2011 1
|