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www.elektor-magazine.com
magazine
September 2014
Professional
Lab Supply
Superb stability
Accurate control & response
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Microcontroller BootCamp (5)
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16-Bit Data Logger
Isolated Oscilloscope Probe
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Three-way CH Boiler Valve Monitor
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Efficient Water
Solenoid Valve
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DesignSpark Tips & Tricks
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Weird Components: Peltier Modules
ELPP: Elektor Labs Preferred Parts
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Inexpensive MyDAQ
Connectivity
NI VirtualBench Review
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Strain Gage with PSoC
T-Boards 8/14/28
Retronics: BK560 Programmable IC Tester
US $9.00 - Canada $10.00
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Contents
magazine
Projects
8 Professional Lab Power Supply
Broadly speaking, low cost and
high quality (low noise and good
regulation) are mutually contradic-
tory requirements. Specifically for
power supplies, the logical solu-
tion to this dilemma is to combine
linear and switching technologies in
order to reap the benefits of both,
which calls for a more complicated
design.
30 Microcontroller BootCamp (5)
One of the longest chapters in the
ATmega328 data sheet is the one
that describes its three timers.
The timers can be used in so many
different ways that we only have
space in the article to look at a
small fraction of the possibilities.
The main application areas are in
measuring time intervals and fre-
quencies, and in generating various
signals including PWM output.
46 Isolated Oscilloscope Probe
An oscilloscope with electrical-
ly isolated inputs is out of the
financial reach of many. Even
differential probes, which (within
certain limits) enable voltages to
be measured without reference to
ground, often cost the private user
more than a complete scope does.
So what can you do when either
safety considerations or the nature
of the task in hand require the use
of isolated connections to your
oscilloscope? You build the Elektor
Isolated Oscilloscope Probe.
40 16-bit Data Logger
To make accurate voltage measure-
ments you need an A/D converter
(ADC) chip which has good res-
olution. The folks at Elektor Labs
have developed a board containing
a four-channel 16-bit ADC. It’s
no coincidence the board uses
a Gnublin/EEC connector which
makes it compatible with Elektor’s
Linux board, the Xmega Webserver
and the latest Extension shield for
Arduino.
20 T-Boards 8/14/28
As your projects become more
ambitious, at some point you may
need to make the move away from
the Arduino platform. More complex
projects, particularly those that need
a specific physical form, are often
best implemented with custom PCB
designs that directly incorporate
the microcontrollers. Enter Elektor’s
T-Boards-8, -14 and -28.
68 Three-way CH Boiler Valve
Monitor
How a 5-dollar circuit can help to
prevent costly repairs on central
heating boilers.
70 Efficient Water Solenoid Valve
An intelligent low-power control
circuit for a reverse osmosis water
filter.
4
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September 2014
|
www.elektor-magazine.com
Volume 40
–
No. 453
September 2014
Review
62 VirtualBench: Multi-function
Measurement Instrument
VirtualBench uses the functionality
of a PC or tablet for its display and
operation, meaning that it doesn’t
need a built-in screen or controls.
This idea is certainly not new, but
it has never been taken as far as in
this device.
DesignSpark
54 DesignSpark Tips & Tricks
Day #13: Component placement.
This month we look at the choices
available to users to place compo-
nents on PCBs: automatically or
manually.
Regulars
84 Hexadoku
The Original Elektorized Sudoku.
80 Retronics
BK Precision BK560
Programmable IC Tester
A glimpse back to the glory days of
TTL (74xx) and CMOS (40xx) ICs,
when testing and replacing individ-
ual devices was serious business if
not craftsmanship.
Series Editor: Jan Buiting.
56 Peltier modules
Weird Components—the series.
Labs
Industry
74 Taking the Strain
A novel approach to performing strain
gage measurements using PSoC
technology and a clever algorithm.
58 ELPP: Elektor Labs Preferred
Parts
Clemens Valens discusses the advan-
tages of purposely limiting the choice
of parts that are “nothing special”,
like electrolytics and .25W resistors.
85 Gerard’s Columns: Engineering
Success
A column or two from our colum-
nist Gerard Fonte.
90 Next Month in Elektor
A sneak preview of articles on the
Elektor publication schedule.
78 News & New Products
A selection of news items received
from the electronics industry, labs
and organizations.
60 Inexpensive MyDAQ Connectivity
A clever solution for a hard to
find connector with .15-inch pin
spacing.
www.elektor-magazine.com
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September
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