Elektor Electronic #378 - June 2008.pdf

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www.elektor.com
JUNE 2008
AUS$ 12.90 - NZ$ 15.50 - SAR 84.95 - US$ 9.95
£ 3.90
electronics worldwide
...
led tester
...
profiler update
...
elektor internet radio
... atM18 rC5 deCo-
SAPS-400
audio amps
SMPSU for
£ 2·00 RLC Meter
Thermo-Snake
can’t beat that price
128 thermometers on a string
satisfactory results
nine soundcards
on the rack
R26
POPULAR KITS
These are some of our most popular kits and there is something for eveyone. They are designed
for ease of construction and robust reliability. All of our kits are supplied with quality fibreglass
PCBs, board components and clear English instruction. Jaycar kits can be built with confidence.
Full Function Smart Card Reader
/ Programmer Kit
KC-5361 £15.95 + postage & packing
Program both the microcontroller and EEPROM in ISO-7816
compliant Gold, Silver and Emerald
wafer cards. Powered by 9-12 VDC
wall adaptor or a 9V battery. Kit
supplied with PCB, wafer card socket
and all electronic components. PCB
measures: 141 x 101mm
Audio Playback Adaptor for
CD-ROM Drives
KC-5459 £19.00 + post & packing
Put those old CD-ROM drives to good use as CD players
using this nifty adaptor kit. The adaptor accepts signals
from common TV remote controls and operates the audio
functions of the drive as easily as you would control a
normal CD player. Kit features a
double sided PCB,
pre-programmed
micro
controller, and
IDC connectors
for the display
panel.
SEE OUR LATEST
CATALOGUE FOR
MORE EXCITING
KITS & HOBBYIST
EQUIPMENT
Starter Projects & Tools
Component Lead
Forming Tool
TH-1810 £2.00 + postage &
packing
This handy forming tool provides
uniform hole spacing from 10 to
38mm. Made in USA from
engineering plastic.
• 138mm long
SMS Controller Module
KC-5400 £15.95 + post & packing
This kit will allow you to remotely control up to eight
devices and monitor four digital inputs via an old Nokia
handset such as the 5110, 6110, 3210, or 3310. Kit supplied
with PCB, pre-programmed microcontroller and all
electronics components with clear English instructions.
Requires a Nokia data cable and
handset.
Starship Enterprise Door
Sound Emulator
KC-5423 £11.75 + post & packing
FOR ALL YOU TREKKIE FANS!
This easy to build kit emulates the
unique sound of a cabin door
opening or closing on the
Star Ship Enterprise. The
sound can be triggered by
switch contacts or even
fitted to automatic
doors. Comes with PCB
with overlay, speaker,
case and all specified
components. 9-
12VDC regulated.
Pin Extractor Press
TH-2014 £3.00 + postage & packing
A handy little pin-extractor/inserter press with a
0.8mm punch. Mainly intended for taking links out of
watch bands, but endless other uses for
jewellery making, model making and
hobbies.
• 2 spare pin punches
• Assortment of 12 pins
Screwdriver Helper
NM-2830 £4.00 + postage & packing
Micromitter Stereo FM
Transmitter Kit
KC-5341 £15.95 + post & packing
This compact transmitter will connect to your CD or MP3
player and send your music to an FM radio anywhere in
your house. Crystal locked to a preselected frequency to
eliminate drift. Supplied with revised PCB with solder mask
and overlay, case,
silk screened lid
and all electronic
components.
Some surface
mounting
soldering
required.
50MHz Frequency Meter Mk II
KC-5440 £20.50 + post & packing
This compact, low cost 50MHZ Frequency Meter is
invaluable for servicing and diagnostic work. Kit includes
PCB with overlay, enclosure, LCD and all electronic
components.
Features include:
• 8 digit reading (LCD)
• Prescaler switch
• Autoranging Hz,
kHz or MHz
Dramatically increases the amount of torque
you can apply to a damaged screw. Just
apply a drop or two of Screwdriver Helper to
instantly help remove or tighten screws with
damaged heads.
Silver Conductive Varnish
NS-3030 £2.95 + postage & packing
Repairs printed circuits, window antennas, window alarm
loops etc. Very good conducting properties.
Approximately 0.02 - 0.1 ohms/cm².
Wire Glue 9ml
NM-2831 £2.75 + postage & packing
A conductive adhesive that enables
you to make solder-free connections
when you aren't able to solder.
Hundreds of hobby, trade and
electronics uses. Lead-free, cures
overnight.
• 9ml
How To Order
Post and Packing Charges
Order Value
Cost
Order Value
Cost
£10 - £49.99
£5
£200 - £499.99 £30
£50 - £99.99
£10
£500+
£40
£100 - £199.99 £20
Max weight 12lb (5kg). Heavier parcels POA.
Minimum order £10.
Note: Products are despatched from Australia, so local
customs duty and taxes may apply.
How to order:
Call Australian Eastern Standard Time Mon-Fri
Phone: 0800 032 7241
Fax: +61 2 8832 3118
Email:
techstore@jaycarelectronics.co.uk
Post: P.O. Box 107, Rydalmere NSW 2116 Australia
Expect 10-14 days for air parcel delivery
Coax Seal Tape
•ORDER ON-LINE
•ALL PRICING IN
POUNDS STERLING
•MINIMUM ORDER
ONLY £10
NM-2828 £3.00 + postage & packing
This versatile material looks like ordinary PVC electrical
tape but is actually a handy sealing system that fuses
together to form a removable, waterproof seal once it
has been applied. 12mm wide x 1.5m long.
Check out the Jaycar range in your FREE Catalogue - logon to
www.jaycarelectronics.co.uk/elektor
or check out the range at
www.jaycarelectronics.co.uk
(Monday - Friday 09.00 to 17.30 GMT + 10 hours only)
For those who want to write:
PO Box 107, Rydalmere NSW 2116 Sydney AUSTRALIA
0800 032 7241
PC Oscilloscopes & Analyzers
DSO Test Instrument Software for BitScope Mixed Signal Oscilloscopes
4 Channel BitScope
2 Channel BitScope
Pocket Analyzer
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Digital Storage Oscilloscope
Up to 4 analog channels using industry standard
probes or POD connected analog inputs.
Capture and display up to 4 analog and 8 logic
channels with sophisticated cross-triggers.
Integrated real-time spectrum analyzer for each
analog channel with concurrent waveform display.
8 logic, External Trigger and special purpose
inputs to capture digital signals down to 25nS.
Record anything DSO can capture. Supports
live data replay and display export.
Flexible network connectivity supporting
multi-scope operation, remote monitoring and
data acquisition.
Export data with DSO using portable CSV files or
use libraries to build custom BitScope solutions.
BitScope DSO Software for Windows and Linux
BitScope DSO is fast and intuitive multi-channel test and measurement software for your
PC or notebook. Whether it's a digital scope, spectrum analyzer, mixed signal scope,
logic analyzer, waveform generator or data recorder, BitScope DSO supports them all.
Capture deep buffer one-shots or display waveforms live just like an analog scope.
Comprehensive test instrument integration means you can view the same data in
different ways simultaneously at the click of a button.
DSO may even be used stand-alone to share data with colleagues, students or
customers. Waveforms may be exported as portable image files or live captures replayed
on other PCs as if a BitScope was locally connected.
BitScope DSO supports all current BitScope models, auto-configures when it connects
and can manage multiple BitScopes concurrently. No manual setup is normally required.
Data export is available for use with third party software tools and BitScope's networked
data acquisition capabilities are fully supported.
Mixed Signal Oscilloscope
Spectrum Analyzer
Logic Analyzer
Data Recorder
Networking
Data Export
www.bitscope.com
3
6/2008 - elektor
More than audio
Looking at this month’s magazi-
ne cover might suggest an over-
abundance of audio projects.
The balance is mote delicate
however, although it can be
argued that a fair number of
articles are related in some way
to audio.
The pages on the SAPS-400
describe a switch-mode power
supply unit (SMPSU) specially
designed for audio power am-
plifiers. This compact light-
weight unit can supply a hefty
400 watts continuously. The
main symmetrical output voltage
is adjustable across a wide
range and a separate ±15-V
auxiliary supply is incorporated
for powering a preamplifier or
similar. SAPS-400 at last ena-
bles high-power, high-end audio
amps to be built where the
enclosure is not 75% filled with
bulky transformers and reservoir
electrolytics.
SMPSUs are now used in lots
of consumer and industrial
equipment because of their
small size and high efficiency.
Still, many designers hate them
for their design complexity and
non-standard parts. Typically,
the solution in these cases is to
use a drop-in supply. Our theo-
retical backgrounder on SMPSU
design on page 40 goes to
show that things might be less
complex than you think.
Our bench test of nine sound-
cards is not about sound
quality in the first place. Lots
of electronics enthusiasts use
the soundcard in their PC to do
low-frequency measurements
and for that it’s essential to have
a linear amplitude response
and a known-good frequency
characteristic. That’s why we
did extensive measurements on
the technical specs for these
soundcards.
A handy application of the
soundcard is described in the
article ‘2-pound RLC Meter’. In
it we show how an exquisite
RLC meter can be built using no
more than your PC, the sound-
card, three components and
a little Java program — very
useful.
Happy reading!
Jan Buiting
Editor
score: 7.5
26 sAPs-400
A comparative
The quality of A/D and D/A converters makes it quite tempting to use a sound card
for audio equipment measurements, especially as it fits quite nicely in the Windows
environment. However, it takes more than good converters to make a good
With the SAPS-400 we offer a powerful, adjustable symmetrical supply that’s ideal
for lightweight audio power amplifiers and happily sits in less than a quarter of the
space taken by a comparable supply of conventional design.
CONTENTS
Volume 34
June 2008
no. 378
projects
26
SAPS-400
SMPSU for audio amplifiers
34
Profiler Update
58
Thermo-Snake
64
2-Pound RLC Meter
70
Invisible Commands
test of nine sound cards
18
74
LED Tester
technology
40
Cool Power
48
USB-to-TTL Serial Cable
50
Other uses for EIR
53
Elektor/Intel ‘unplugged’:
results revealed
54
Air, Power,
Sound and Heat
63
Mains Adapters
instrument, as we all know. Our test shows how well a number of sound
cards score with real signals.
58 Thermo-snake
This low-cost project allows you
to connect from 1 up to 128
digital thermometers like
the Dallas DS18B20
directly on a single
two-wire cable. All temperature
values are recorded on your PC through a USB port without memory space
limitation. Using the software manager developed for the project you can
monitor the temperature in real time and set an alarm threshold value for
each individual thermometer.
info & market
6
8
Colophon
Mailbox
10
News & New Products
18
Score: 7.5
A comparative test of nine
sound cards
69
Electrical Safety page
80
Elektor SHOP
84
Sneak Preview
64 2-Pound rLc Meter
Is it possible to make an RLC meter for less than two pounds? In this article
the authors answer this question with a resounding ‘yes’ in the form of a
simple and compact circuit that will enable you to make RLC measurements
rapidly, accurately, and, above all, cheaply.
infotainment
76
Hexadoku
77
Retronics
Neuwirth FUP1D
PMR test unit (1973)

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