siliconchip.com.auVol.32, No.6; June 2019
Contents
SILICON
CHIP
http://www.facebook.com/siliconchipmagazinewww.facebook.com/siliconchipmagazineFeatures & Reviews
14 From a knotted rope to side-scanning SONAR
The latest side scan and multibeam sonar systems are helping to build an accurate
map of the seabed; even finding sunken ships and aircraft. It’s called “bathymetry”
and it has come a long way from ropes with knots in them – by Dr David Maddison40 e-Paper displays: no paper involved!
Small e-Paper Displays (also known as e-Ink) are now becoming available as
electronic modules, making them usable by hobbyists. In this article, we explain
what they do, how to use them and where to get them – by Tim Blythman88 El Cheapo Modules: Long Range (LoRa) Transceivers
Connecting a couple of computers, Arduinos, Micromites or other micros via a
UHF wireless data link is easy if you use a pair of low-cost modules based on the
SX1278 ultra-low-power LoRa modem/transceiver chip – by Jim RoweConstructional Projects
26 An AM/FM/CW Scanning HF/VHF RF Signal Generator
Here’s one for amateurs or anyone interested in HF/VHF radio. This low-cost,
easy-to-build and user-friendly RF signal generator covers from 100kHz–50MHz
and 70–120MHz, and is usable up to 150MHz – by Andrew Woodfield, ZL2PD45 Steering Wheel Audio Button To Infrared Adaptor
Most new cars have push-button controls on the steering wheel to control the in-
car audio system. But what if you update your audio system? We take advantage
of the usual inbuilt infrared control to regain push-button control – by John Clarke68 Very accurate speedo, car clock & auto volume change
Based on a GPS signal, this gives you a MUCH more accurate speed than your
vehicle’s speedometer (which you shouldn’t trust!), a very accurate clock – and it
will vary your car audio volume depending on your speed! – by Tim Blythman77 DSP Active Crossover and 8-channel Parametric Equaliser
Part Two has all the construction details (including parts lists) for the superb hifi
stereo digital signal processor (DSP), two-way active crossover and eight channel
parametric equaliser introduced last month – by Phil Prosser and Nicholas VinenYour Favourite Columns
62 Serviceman’s Log
Fixing a “cheap as” set of “cans” – by Dave Thompson94 Circuit Notebook
(1) Touchscreen clock radio using a Micromite LCD BackPack
(2) Control an aircon with an RTC and two micros
(3) Diode/transistor/Mosfet tester100 Vintage Radio
AWA Radiola Model 137– by Rob LeplawEverything Else!
If you’ve updated your car sound
system you probably know that the
steering wheel push-buttons no
longer work! With this project they
can work once again... – Page 45Side scanning
and multi-
beam sonar
are changing
the way we
see the seabed- Page 14
Your car speedo
can be out by
several km/h! This
one is GPS based
so it’s spot on!
And it has other
functions too!- Page 68
2 Editorial Viewpoint
4 Mailbag – Your Feedback
61 Product Showcase
104 SILICON CHIP ONLINE SHOP
106 Ask SILICON CHIP
111 Market Centre
112 Advertising Index
112 Notes and ErrataWe intro-
duced our
new DSP,
Active
Crossover,
and 8-channel parametric equaliser
last month. Now we get to the fun
part – building it! – Page 77If you’re into
HF or VHF
radio you’re
going to
LOVE this
AM/FM/CW
Scanning RF Signal Generator- Page 26
e-Paper displays are
suitable for a wide
range of hobbyist
projects. We explain
them and tell you how
to use them – Page 40