Contents
Vol.30, No.4; April 2017
SILICON
CHIP
www.siliconchip.com.au
Features
14 DRED: they can turn your aircon off!
It sounds like a misprint! DRED is a “feature” built into all new air conditioners
and if enabled, will allow supply authorities to remotely turn your air conditioner
down by 25%, 50% or even to fan-only mode – by Dr David Maddison
18 El Cheapo Modules, Part 6: Direct Digital Synthesiser
This tiny DDS function generator module can produce accurate sine, square or
triangle waveforms from 0.1Hz to 12.5MHz. It uses the Analog Devices AD9833
DDS chip and a 25MHz crystal oscillator and costs next to nothing – by Jim
Rowe
DRED allows supply authorities to
control your air conditioner – without
your knowledge – Page 14
79 Review: Keysight DSOX1102G Digital Oscilloscope
There are a lot of compact, low-cost scopes on the market. Some undercut the
Keysight on price but we doubt if any of them could compete with the sheer
performance of the MegaZoom IV chipset – by Nicholas Vinen
Many musicians prefer the sound
of a spring reverberation unit over
modern digital types – Page 26
Projects To Build
26 New Spring Reverberation Unit
Can a reverb unit make a mediocre guitarist sound like a star? Maybe not, but
this spring reverb unit will really lift your sound – by Nicholas Vinen
38 The eFuse: never replace another blown fuse
When you’ve replaced a fuse for the nth time, you’ll wonder why you didn’t build
the eFuse! Press a button and it resets – by John Clarke
53 A Digital LCD Audio ’Scope for less than $40!
This build-it-yourself Chinese scope kit gives a good bang for your buck. Great
for audio troubleshooting and general electronics work – by Jim Rowe
Sick of replacing
fuses? Just push the button
on our new eFuse and it resets
itself – Page 38
68 Micromite BackPack Touchscreen DDS Signal Generator
Combines a low-cost DDS module with a Micromite BackPack to produce a
highly useful sine, square and triangle waveform generator with a touchscreen
LCD. It’s ideal for audio and RF applications, including service work – by Geoff
Graham
Special Columns
58 Serviceman’s Log
Stomping on the effects pedal killed it! – by Dave Thompson
76 Circuit Notebook
(1) Two modifications for the Battery LifeSaver
(2) Measuring weight using an Arduino
(3) Simple bird scarer stops tree damage
Yes! You can build a fully
functioning audio LCD ’scope for
under $40.00! – Page 53
84 Vintage Television
Sony’s TV8-301: the world’s first direct-view transistor TV set – by Ian Batty
Departments
2 Publisher’s Letter 90
4 Mailbag 95
25 SILICON CHIP Subscriptions 96
siliconchip.com.au
82 SILICON CHIP Online Shop 96
Ask Silicon Chip
Market Centre
Advertising Index
Notes and Errata
Add a
Micromite BackPack
to a cheap DDS module and you
have a multi-waveform function
generator with LCD – Page 68
April 2017 1
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