Elektor_2006_06.pdf

JUNE 2006

£3.80

www.elektor-electronics.co.uk

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Claw your way through our 410+ page

catalogue jam-packed with over 780 new

and exciting products for 2006. Jump onto

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Max weight 12lb (5kg). Heavier

parcels POA. Minimum order £20.

Tempmaster Kit

KC-5413 £11.75 + post and packing

Need accurate

temperature for a wine

cooler or beer

brewing heater?

This project turns a

regular fridge or

freezer into a

wine cooler by

accurately

controlling the temperature to make it suitable

for wine storage. A much cheaper option than

commercial units. Kit supplied with PCB, case,

mains plug & all electronic components.

Starship Enterprise

Door Sound Simulator

KC-5423 £11.75 + post & packing

Emulate the unique sound made when the cabin

doors on the Starship Enterprise open and close. It

can be triggered by switch contacts, which means

you can use a reed magnet switch, IR beam or PIR

detector. Kit includes a machined, silkscreened,

and pre-drilled case,circuit

board, speaker and

all electronic

components with

clear English

instructions.

• Power: 9-12VDC.

For all you

Trekkie

fans...

Battery Zapper MkII

KC-5427 £29.00 + post & packing

The circuit produces short bursts

of high level energy to reverse

the damaging sulphation

effect in wet lead acid cell

batteries. This improved

unit features a battery

health checker with LED

indicator, circuit

protection against badly

sulphated batteries, test

points for a DMM and

connection for a battery charger.

Kit includes a machined, silkscreened, and pre-

drilled case, circuit board, alligator clips, all elec-

tronic components with clear English instructions.

Suitable for 6, 12, and 24V batteries.

Battery Zapper Add-On Kit

KC-5428 £17.50 + post & packing

If you are one of our customers who purchased

the original Battery Zapper Kit, buy

this add-on and upgrade your Zapper

to the full functionality of the

Battery Zapper MKII

Australian to UK mains adaptor

required. Use PP-4020 £2.95

Theremin Synthesiser Kit

KC-5295 £14.75 + post & packing

The Theremin is a strange

musical instru-

ment that was

invented early

last century

but is still used

today. The Beach

Boys' classic hit "Good

Vibrations" featured a Theremin. By moving

you hand between the antenna and the metal

plate, you can create unusual sound effects. Kit

includes a machined, silkscreened, and pre-drilled

case, circuit board, all electronic components with

clear English instructions.

• This product is also available built and fully

tested AM-4025 £29.95

Voltage Monitor Kit

KC-5424 £6.00 + post and packing

This versatile kit will allow you to

monitor the battery

voltage, the airflow

meter or oxygen

sensor in your

car. The kit

features a 10 LED

bargraph that lights

the LEDs in response to

the measured voltage,

preset 9-16V, 0.-5V or 0-1V ranges complete

with a fast response time, high input impedance

and auto dimming for night time driving.

Kit includes PCB with overlay, LED bargraph and

all electronic components.

• 12VDC

• Recommended box:

UB5 HB-6015 £0.83

AVR Adaptor Board

KC-5421 £10.25 + post & packing

A low cost method of stand alone programming

for when the application board

is unavailable or doesn’t

include an ISP (or JTAG)

header. The kit includes

everything you need to

support in-system pro-

gramming, complete with a

regulated power supply, clock

source and microcontroller IC socket.

Designed in conjunction with KC-5420 AVR

Serial Programmer (shown below)

AVR ISP Serial Programmer

KC-5340 £14.75 + post & packing

The kit connects to the serial port, uses royalty

free software available on

the Internet and allows

you to program a

multitude of micros in

the AVR 8-bit RISC

family (see our web-

site for listing). Kit

includes PCB, case

with silkscreened lid

and all electronic

components.

Requires 9VDC wall adaptor

(Maplin #GS74R £9.99).

Speaker Bass Extender Kit

KC-5411 £6.00 + post & packing

Most audiophiles know that loudspeaker enclosures

have a natural frequency rolloff which is inherent in

their design. The Bass Extender kit boosts the level

of the bass to counteract the natural rolloff of the

enclosure, producing rich, natural bass. It gives an

extra octave of response, and is sure to

please even the most avid

audiophiles.

• Kit supplied with

PCB, and all

electronic

components.

Universal High Energy Ignition Kit

KC-5419 £27.75 + post & packing

A high energy 0.9ms spark burns fuel faster and

more efficiently to give you more power! This kit

can be connected to conventional

points twin points or

reluctor ignition

systems. Kit includes

PCB, case and

all electronic

components with

clear English

instructions.

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e lektor

lectronics

leading the way

20 kilovolts missing

I must confess to being old school

when it comes to controls on equip-

ment. When I tried to get some of the

scopemeters featured in this issue to

‘do’ a timebase of 20 ms for me I was

soon lost in menus and countless press-

ing of plastic and rubber buttons even

smaller than the ones on my mobile

phone. My colleagues, tongue in

cheek, tell me it’s because “I haven’t

read the manual” (it’s on CD Jan!) or

“nobody wants to use a 20-ms time-

base”. It’s only then you realise that

test and measurement equipment

requires quite a bit of getting used to

and that not much has changed in that

respect despite the miniaturisation of

the instruments proper, and in particu-

lar their controls. Gone are the days

when muscle was required to pull the

trolley carrying my noisy Tektronix

535B tube oscilloscope closer to the

workbench. Next, strong manual

action was needed on at least ﬁve

front panel controls to switch the instru-

ment to the desired settings.

As it happened, the instrument, after

two decades of intensive use in my

electronics workshop, was let down by

the very devices that suggest its robust-

ness — the front panel controls! Some

rotary switches developed bad con-

tacts, and in some cases the shafts and

mini bearings suffered from wear and

tear. In one extreme case, a valve cir-

cuit in a two-channel 100-MHz plug-in

unit failed owing to a complex contact

arrangement that was supposed to be

‘break before make’ but in fact was

more like a ‘make at all times’. A nice

faultﬁnding job ensued which was

remarkable in two ways. Firstly, it was

carried out using the ‘scope itself ﬁtted

with a borrowed plug-in and secondly,

I did the soldering with silver solder of

which a small quantity was found on a

plastic reel ﬁtted on top of the PSU

inside the instrument. Courtesy of Tek-

tronix Inc.!

These Tek beasts with their massive

hoods at either side are now on

Ebay’s vintage electronics pages.

Rightly so; their functionality has been

taken over by portable instruments

with 20 times less weight. Hard to

beat the crisp image from a 20-kV

accelerated CRT, though.

All in One Hand

Scopemeters are primarily designed for portable

use. Like USB oscilloscopes, many of them are

multifunction instruments. Although some models

can only be used as oscilloscopes, most of them can

also be used as multimeters or (in some cases) FFT

analysers. Here we subject a number of these

instruments to a close examination.

14 Kick-off for HDTV?

The FIFA World Cup football tournament

is an ideal showcase for High

Deﬁnition television which

promises to convey the live

action in stunning detail.

Each ticket sold for every

game carries an RFID tag

but the match ball (for the

time being anyway) still con-

tains only air… A look at the

role of electronics in this

upcoming media event.

54 FM Stereo Test Transmitter

This small signal

generator uses an

ingenious tech-

nique to generate a

sine wave with very

low distortion, a mono (L+R) base-

band signal and an FM stereo signal.

Jan Buiting, Editor

p.s. don’t forget to participate in our

R8C Design Competition!

lectronics

CONTENTS

Volume 32

June 2006

no. 355

know-how

28 RFID and Security

hands-on

42 Find the Fault

48 Network Cable Tester

54 FM Stereo Test Transmitter

60 FPGA Course (3)

66 Modding for Home Improve-

ment

76 Design Tips

Solder pistol as demagnetising tool

NOPs for faultﬁnding

technology

14 Kick-off for HDTV?

22 ePassports

70 E-blocks and X-10

info & market

6 Colophon

8 Mailbox

10 News & New Products

32 All in One Hand

(Scopemeters)

81 Elektor SHOP

84 Sneak Preview

22 ePassports

infotainment

ePassports have an embedded RFID tag containing your per-

sonal information which Immigration officials can read

remotely; hopefully nobody else will be eavesdropping on

this electronic conversation…

75 Retronics:

ElektorScope (1976/1977)

77 Hexadoku (6)

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