Everyday Practical Electronics 2001-06.pdf

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Volume 3 Issue 6
June 2001
Copyright © 1999 Wimborne Publishing Ltd and
Maxfield & Montrose Interactive Inc
EPE Online, Febuary 1999 - www.epemag.com - XXX
Copyright
©
2001, Wimborne Publishing Ltd
(Allen House, East Borough, Wimborne, Dorset, BH21 1PF, UK)
and Maxfield & Montrose Interactive Inc.,
(PO Box 857, Madison, Alabama 35758, USA)
All rights reserved.
WARNING!
The materials and works contained within
EPE Online
— which are made
available by Wimborne Publishing Ltd and Maxfield & Montrose Interactive Inc —
are copyrighted. You are permitted to make a backup copy of the downloaded file
and one (1) hard copy of such materials and works for your personal use.
International copyright laws, however, prohibit any further copying or
reproduction of such materials and works, or any republication of any kind.
Maxfield & Montrose Interactive Inc and Wimborne Publishing Ltd have used
their best efforts in preparing these materials and works. However, Maxfield &
Montrose Interactive Inc and Wimborne Publishing Ltd make no warranties of
any kind, expressed or implied, with regard to the documentation or data
contained herein, and specifically disclaim, without limitation, any implied
warranties of merchantability and fitness for a particular purpose.
Because of possible variances in the quality and condition of materials and
workmanship used by readers,
EPE Online,
its publishers and agents disclaim
any responsibility for the safe and proper functioning of reader-constructed
projects based on or from information published in these materials and works.
In no event shall Maxfield & Montrose Interactive Inc or Wimborne Publishing Ltd
be responsible or liable for any loss of profit or any other commercial damages,
including but not limited to special, incidental, consequential, or any other
damages in connection with or arising out of furnishing, performance, or use of
these materials and works.
ISSN 0262 3617
PROJECTS . . . THEORY . . . NEWS . . .
COMMENTS . . . POPULAR FEATURES . . .
VOL. 30. No. 6
JUNE 2001
Cover illustration by Jonathan Robertson
www.epemag.wimborne.co.uk
EPE Online:
www.epemag.com
Projects and Circuits
MAGFIELD MONITOR
by Andy Flind
Sophisticated fluxgate sensor monitors static and alternating magnetic
fields via a meter and headphones
DUMMY PIR DETECTOR
by Bart Trepak
An extremely inexpensive way to foil would-be intruders
HOSEPIPE CONTROLLER
by Terry de Vaux-Balbirnie
How to avoid wasting money when watering your garden
INGENUITY UNLIMITED
hosted by Alan Winstanley
Transistor Tester; DMM Auto Power Off; Broken Field Detector
IN-CIRCUIT OHMMETER
by Owen Bishop
Our final Top-Tenner project enables you to measure in-circuit resistance
400
410
421
442
450
Series and Features
CONTROLLING JODRELL BANK
by Owen Bishop
An insight into how electronics plays a vital role in our investigations
of the Universe
NEW TECHNOLOGY UPDATE
by Ian Poole
Silicon-germanium semiconductors promise higher speed and more
compact architectures
NET WORK – THE INTERNET PAGE
surfed by Alan Winstanley
Search And You Shall Find (Usually) – how search engines work
PIC16F87x EXTENDED MEMORY
by John Becker
How to use the additional memory banks of PIC16F87x devices
PRACTICALLY SPEAKING
by Robert Penfold
A novice’s guide to trouble-shooting project assembly
CIRCUIT SURGERY
by Alan Winstanley and Ian Bell
More on Impedance Matching; Silenium Rectifiers
412
428
430
432
438
446
Regulars and Services
EDITORIAL
399
NEWS –
Barry Fox highlights technology’s leading edge
407
Plus everyday news from the world of electronics
READOUT
John Becker addresses general points arising
418
SHOPTALK
with David Barrington
431
The
essential
guide to component buying for
EPE
projects
PLEASE TAKE NOTE
Intruder Alarm Control Panel (Apr/May ’01)
431
CD-ROMS FOR ELECTRONICS
440
Electronic Projects; Filters; Digital Works 3.0; Parts Gallery + Electronic
Circuits and Components; Digital Electronics; Analogue Electronics; PICtutor;
Modular Circuit Design; Electronic Components Photos; C for PIC Micros;
CAD Pack
BACK ISSUES
Did you miss these? Some now on CD-ROM!
444
ELECTRONICS MANUALS
448
Essential reference works for hobbyists, students and service engineers
DIRECT BOOK SERVICE
453
A wide range of technical books available by mail order, plus more CD-ROMs
ELECTRONICS VIDEOS
Our range of educational videos
456
PRINTED CIRCUIT BOARD AND SOFTWARE SERVICE
457
PCBs for
EPE
projects. Plus
EPE
software
© Wimborne Publishing Ltd 2001. Copyright in all
drawings, photographs and articles published in
EVERYDAY PRACTICAL ELECTRONICS is fully
protected, and reproduction or imitations in whole or
in part are expressly forbidden.
ADVERTISERS INDEX
460
Our July 2001 issue will be published on Thursday,
14 June 2001. See page 391 for details
Readers Services
)
Editorial and Advertisement Departments 399
389
Everyday Practical Electronics, June 2001
NEXT MONTH
PIC TO PRINTER INTERFACE
This article describes how a PIC microcontroller can be used to
independently control almost any Epson-compatible dot-matrix printer.
An examination is first made of how Epson printers are
controlled, using simple commands to illustrate how
text and graphics can be printed under PIC
control. Readers are encouraged to modify
the basic PIC software to suit their own
designs, adding extra printing features
according to Epson’s extensive manual,
which is available for free download from
Epson’s web site.
As a practical example of PIC to printer
control, the construction of a simple data logger is
described. The logger inputs analogue data and plots it
as a graph on the printer. Both fan-fold and cut-sheet paper
can be used.
The logger has selectable sampling periods, ranging from once per
second to once every 255 seconds (4.25 minutes). An hours-minutes-
seconds clock facility is built into the controlling software.
S
RIE
E
WS
PERPETUAL PROJECTS
NE
This short series includes eight “perpetual” projects, all of which will
continue to run indefinitely without attention. All are based on one small
p.c.b. called a “uniboard”. Each project is powered around the clock –
perpetually – by a 1 Farad “Goldcap” capacitor and a small solar cell (no
battery). Each is designed for continuous operation with a maximum of
thirty minutes sunlight a day – in fact just
five minutes sunlight
with the
specified 300nW solar panel. The typical power requirements of one of
these Perpetual Projects are more than
one thousand times
less than the
requirements of an ordinary l.e.d. The various projects are:
)L.E.D.
flasher
)
Loop burglar alarm
)
Double door-buzzer
)
Door-light
)
Rain
alarm
)
Gate sentinel
)
Bird scarer
)
Register
Besides the projects listed here, the series includes nine suggestions for
modifications. These include a single door-buzzer, broken beam beeper,
power failure alarm, soil moisture monitor, thermistor, timer, liquid-level
alarm, wake-up alarm, and a break contact alarm.
STEREO / SURROUND
SOUND AMPLIFIER
An inexpensive, easy to build,
stereo amplifier that can also
produce pseudo surround sound
when used with an existing
amplifier. It’s not Dolby Pro-Logic
but the effect – considering the
modest cost – is quite convincing.
No doubt this neat little project
will also find many other uses i.e.
to amplify a personal stereo or as
a test amp. in the workshop etc.
PLUS ALL THE REGULAR FEATURES
NO ONE DOES IT BETTER
DON'T MISS AN
ISSUE – PLACE YOUR
ORDER NOW!
Demand is bound to be high
JULY 2001 ISSUE ON SALE THURSDAY, JUNE 14
Everyday Practical Electronics, June 2001
391
Q
UASAR
E
LECTRONICS
L
imited
Unit 14 Sunningdale, BISHOPS STORTFORD, Herts. CM23 2PA
Established 1990
TEL: 01279 306504
FAX: 07092 203496
High performance surveillance bugs. Room transmitters supplied with sensitive electret microphone & battery holder/clip. All transmit-
ters can be received on an ordinary VHF/FM radio between 88-108MHz. Available in Kit Form (KT) or Assembled & Tested (AS).
SURVEILLANCE
ADD £2.00 P&P to all orders (or 1st Class Recorded £4, Next day
(Insured £250) £7, Europe £5.00, Rest of World £10.00). We accept all
major credit cards. Make cheques/PO's payable to Quasar Electronics.
Prices include 17.5% VAT.
MAIL ORDER ONLY
FREE CATALOGUE with order or send 2 x 1st class stamps
(refundable) for details of over 150 kits & publications.
PROJECT KITS
Our electronic kits are supplied complete with all components, high quality PCBs
(NOT cheap Tripad strip board!) and detailed assembly/operating instructions
*
2 x 25W CAR BOOSTER AMPLIFIER
Connects to
the output of an existing car stereo cassette player,
CD player or radio. Heatsinks provided. PCB
76x75mm.
1046KT. £24.95
*
3-CHANNEL WIRELESS LIGHT MODULATOR
No electrical connection with amplifier. Light modu-
lation achieved via a sensitive electret microphone.
Separate sensitivity control per channel. Power
handing 400W/channel. PCB 54x112mm. Mains
powered. Box provided.
6014KT £24.95
*
12 RUNNING LIGHT EFFECT
Exciting 12 LED
light effect ideal for parties, discos, shop-windows &
eye-catching signs. PCB design allows replacement
of LEDs with 220V bulbs by inserting 3 TRIACs.
Adjustable rotation speed & direction. PCB
54x112mm.
1026KT £15.95; BOX (for mains opera-
tion) 2026BX £9.00
*
DISCO STROBE LIGHT
Probably the most excit-
ing of all light effects. Very bright strobe tube.
Adjustable strobe frequency: 1-60Hz. Mains powered.
PCB: 60x68mm. Box provided.
6037KT £28.95
*
ANIMAL SOUNDS
Cat, dog, chicken & cow. Ideal
for kids farmyard toys & schools.
SG10M £5.95
*
3 1/2 DIGIT LED PANEL METER
Use for basic
voltage/current displays or customise to measure
temperature, light, weight, movement, sound lev-
els, etc. with appropriate sensors (not supplied).
Various input circuit designs provided.
3061KT
£13.95
*
IR REMOTE TOGGLE SWITCH
Use any TV/VCR
remote control unit to switch onboard 12V/1A relay
on/off.
3058KT £10.95
SPEED CONTROLLER
for any common DC motor up
to 100V/5A. Pulse width modulation gives maximum
torque at all speeds. 5-15VDC. Box provided.
3067KT
£12.95
*
3 x 8 CHANNEL IR RELAY BOARD
Control eight 12V/1A
relays by Infra Red (IR) remote control over a 20m range in
sunlight. 6 relays turn on only, the other 2 toggle on/off. 3 oper-
ation ranges determined by jumpers. Transmitter case & all
components provided. Receiver PCB 76x89mm.
3072KT
£52.95
www.QuasarElectronics.com
*
MTX
- MINIATURE 3V TRANSMITTER
Easy to build & guar-
anteed to transmit 300m @ 3V. Long battery life. 3-5V operation.
Only 45x18mm.
B 3007KT £6.95 AS3007 £11.95
MRTX
- MINIATURE 9V TRANSMITTER
Our best selling bug.
Super sensitive, high power - 500m range @ 9V (over 1km with
18V supply and better aerial). 45x19mm.
3018KT £7.95 AS3018
£12.95
HPTX
- HIGH POWER TRANSMITTER
High performance, 2
stage transmitter gives
greater stability & higher qual-
ity reception. 1000m range 6-
12V DC operation. Size
70x15mm.
3032KT £9.95
AS3032 £18.95
*
MMTX
- MICRO-MINIATURE 9V TRANSMITTER
The ultimate
bug for its size, performance and price. Just 15x25mm. 500m
range @ 9V. Good stability. 6-18V operation.
3051KT £8.95
AS3051 £14.95
*
VTX
- VOICE ACTIVATED TRANSMITTER
Operates only
when sounds detected. Low standby current. Variable trigger sen-
sitivity. 500m range. Peaking circuit supplied for maximum RF out-
put. On/off switch. 6V operation. Only 63x38mm.
3028KT £12.95
AS3028 £21.95
HARD-WIRED BUG/TWO STATION INTERCOM
Each station
has its own amplifier, speaker and mic. Can be set up as either a
hard-wired bug or two-station intercom. 10m x 2-core cable sup-
plied. 9V operation.
3021KT £15.95 (kit form only)
*
TRVS
- TAPE RECORDER VOX SWITCH
Used to automati-
cally operate a tape recorder (not supplied) via its REMOTE sock-
et when sounds are detected. All conversations recorded.
Adjustable sensitivity & turn-off delay. 115x19mm.
3013KT £9.95
AS3013 £21.95
700W power. PCB: 48mm x 65mm. Box provided.
6074KT £17.95
*
3 INPUT MONO MIXER
Independent level con-
trol for each input and separate bass/treble controls.
Input sensitivity: 240mV. 18V DC. PCB: 60mm x
185mm
1052KT £16.95
*
NEGATIVE\POSITIVE ION GENERATOR
Standard Cockcroft-Walton multiplier circuit. Mains
voltage experience required.
3057KT £10.95
*
LED DICE
Classic intro to electronics & circuit
analysis. 7 LED’s simulate dice roll, slow down & land
on a number at random. 555 IC circuit.
3003KT £9.95
*
STAIRWAY TO HEAVEN
Tests hand-eye co-ordi-
nation. Press switch when green segment of LED
lights to climb the stairway - miss & start again!
Good intro to several basic circuits.
3005KT £9.95
*
ROULETTE LED
‘Ball’ spins round the wheel,
slows down & drops into a slot. 10 LED’s. Good intro
to CMOS decade counters & Op-Amps.
3006KT
£10.95
*
9V XENON TUBE FLASHER
Transformer circuit
steps up 9V battery to flash a 25mm Xenon tube.
Adjustable flash rate (0·25-2 Sec’s).
3022KT £11.95
*
LED FLASHER 1
5 ultra bright red LED’s flash in
7 selectable patterns.
3037MKT £5.95
*
LED FLASHER 2
Similar to above but flash in
sequence or randomly. Ideal for model railways.
3052MKT £5.95
*
INTRODUCTION TO PIC PROGRAMMING.
Learn programming from scratch. Programming
hardware, a P16F84 chip and a two-part, practical,
hands-on tutorial series are provided.
3081KT
£22.95
*
SERIAL PIC PROGRAMMER
for all 8/18/28/40
pin DIP serial programmed PICs. Shareware soft-
ware supplied limited to programming 256 bytes
(registration costs £14.95).
3096KT £13.95
*
ATMEL 89Cx051 PROGRAMMER
Simple-to-
use yet powerful programmer for the Atmel
89C1051, 89C2051 & 89C4051 uC’s. Programmer
does NOT require special software other than a
terminal emulator program (built into Windows).
Can be used with ANY computer/operating sys-
tem.
3121KT £24.95
*
3V/1·5V TO 9V BATTERY CONVERTER
Replace
expensive 9V batteries with economic 1.5V batter-
ies. IC based circuit steps up 1 or 2 ‘AA’ batteries to
give 9V/18mA.
3035KT £5.95
*
STABILISED POWER SUPPLY 3-30V/2.5A
Ideal for hobbyist & professional laboratory. Very
reliable & versatile design at an extremely reason-
able price. Short circuit protection. Variable DC
voltages (3-30V). Rated output 2.5 Amps. Large
heatsink supplied. You just supply a 24VAC/3A
transformer. PCB 55x112mm. Mains operation.
1007KT £16.95.
ROOM SURVEILLANCE
*
MTTX
- MINIATURE TELEPHONE TRANSMITTER
Attaches
anywhere to phone line. Transmits only when phone is used!
Tune-in your radio and hear both parties. 300m range. Uses line
as aerial & power source. 20x45mm.
3016KT £8.95 AS3016
£14.95
*
TRI
- TELEPHONE RECORDING INTERFACE
Automatically
record all conversations. Connects between phone line & tape
recorder (not supplied). Operates recorders with 1.5-12V battery
systems. Powered from line. 50x33mm.
3033KT £9.95 AS3033
£18.95
*
TPA
- TELEPHONE PICK-UP AMPLIFIER/WIRELESS
PHONE BUG
Place pick-up coil on the phone line or near phone
earpiece and hear both sides of the conversation.
3055KT £11.95
AS3055 £20.95
TELEPHONE SURVEILLANCE
Credit Card Sales: 01279 306504
*
1 WATT FM TRANSMITTER
Easy to construct. Delivers a
crisp, clear signal. Two-stage circuit. Kit includes microphone and
requires a simple open dipole aerial. 8-30VDC. PCB 42x45mm.
1009KT £14.95
*
4 WATT FM TRANSMITTER
Comprises three RF
stages and an audio preamplifier stage. Piezoelectric
microphone supplied or you can use a separate preampli-
fier circuit. Antenna can be an open dipole or Ground
Plane. Ideal project for those who wish to get started in the
fascinating world of FM broadcasting and want a good
basic circuit to experiment with. 12-18VDC. PCB
44x146mm.
1028KT. £22.95 AS1028 £34.95
*
15 WATT FM TRANSMITTER (PRE-ASSEMBLED &
TESTED)
Four transistor based stages with Philips BLY
88 in final stage. 15 Watts RF power on the air. 88-
108MHz. Accepts open dipole, Ground Plane, 5/8, J, or
YAGI antennas. 12-18VDC. PCB 70x220mm. SWS meter
needed for alignment.
1021KT £99.95
*
SIMILAR TO ABOVE BUT 25W Output. 1031KT £109.95
*
STABILISED POWER SUPPLY 2-30V/5A
As kit
1007 above but rated at 5Amp. Requires a
24VAC/5A transformer.
1096KT £27.95.
*
MOTORBIKE ALARM
Uses a reliable vibration
sensor (adjustable sensitivity) to detect movement
of the bike to trigger the alarm & switch the output
relay to which a siren, bikes horn, indicators or
other warning device can be attached. Auto-reset.
6-12VDC. PCB 57x64mm.
1011KT £11.95
Box
2011BX £7.00
*
CAR ALARM SYSTEM
Protect your car from
theft. Features vibration sensor, courtesy/boot light
voltage drop sensor and bonnet/boot earth switch
sensor. Entry/exit delays, auto-reset and adjustable
alarm duration. 6-12V DC. PCB: 47mm x 55mm
1019KT £11.95
Box
2019BX £8.00
*
PIEZO SCREAMER
110dB of ear piercing noise.
Fits in box with 2 x 35mm piezo elements built into
their own resonant cavity. Use as an alarm siren or
just for fun! 6-9VDC.
3015KT £10.95
*
COMBINATION LOCK
Versatile electronic lock
comprising main circuit & separate keypad for
remote opening of lock. Relay supplied.
3029KT
£10.95
*
ULTRASONIC MOVEMENT DETECTOR
Crystal
locked detector frequency for stability & reliability. PCB
75x40mm houses all components. 4-7m range.
Adjustable sensitivity. Output will drive external
relay/circuits. 9VDC.
3049KT £13.95
*
PIR DETECTOR MODULE
3-lead assembled
unit just 25x35mm as used in commercial burglar
alarm systems.
3076KT £8.95
*
INFRARED SECURITY BEAM
When the invisible
IR beam is broken a relay is tripped that can be used
to sound a bell or alarm. 25 metre range. Mains
rated relays provided. 12VDC operation.
3130KT
£12.95
*
SQUARE WAVE OSCILLATOR
Generates
square waves at 6 preset frequencies in factors of 10
from 1Hz-100KHz. Visual output indicator. 5-18VDC.
Box provided.
3111KT £8.95
*
PC DRIVEN POCKET SAMPLER/DATA LOG-
GER
Analogue voltage sampler records voltages
up to 2V or 20V over periods from milli-seconds to
months. Can also be used as a simple digital
scope to examine audio & other signals up to
about 5KHz. Software & D-shell case provided.
3112KT £18.95
*
20 MHz FUNCTION GENERATOR
Square, tri-
angular and sine waveform up to 20MHz over 3
ranges using ‘coarse’ and ‘fine’ frequency adjust-
ment controls. Adjustable output from 0-2V p-p. A
TTL output is also provided for connection to a
frequency meter. Uses MAX038 IC. Plastic case
with printed front/rear panels & all components
provided. 7-12VAC.
3101KT £69.95
HIGH POWER TRANSMITTERS
PRODUCT FEATURE
4 WATT FM TRANSMITTER
Small but powerful 4 Watt 88-108MHz FM trans-
mitter with an audio preamplifier stage and 3 RF
stages. Accepts a wide variety of input sources
– the electret microphone supplied, a tape
player or for more professional results, a sepa-
rate audio mixer (like our 3-Input Mono Mixer kit
1052).
Can be used with an open dipole or
ground plane antenna. Supply: 12-15V DC/0·5A.
PCB: 45 x 145mm.
ORDERING INFO:
Kit 1028KT
£22.95.
OPTIONAL EXTRAS:
3-Input Mono Mixer Kit
1052KT
£17.95.
AS1028
£39.95.
*
SOUND EFFECTS GENERATOR
Easy to build.
Create an almost infinite variety of interesting/unusu-
al sound effects from birds chirping to sirens. 9VDC.
PCB 54x85mm.
1045KT £8.95
*
ROBOT VOICE EFFECT
Make your voice
sound similar to a robot or Darlek. Great fun for
discos, school plays, theatre productions, radio
stations & playing jokes on your friends when
answering the phone! PCB 42x71mm.
1131KT
£8.95
*
AUDIO TO LIGHT MODULATOR
Controls intensi-
ty of one or more lights in response to an audio input.
Safe, modern opto-coupler design. Mains voltage
experience required.
3012KT £8.95
*
MUSIC BOX
Activated by light. Plays 8 Christmas
songs and 5 other tunes.
3104KT £7.95
*
20 SECOND VOICE RECORDER
Uses non-
volatile memory - no battery backup needed.
Record/replay messages over & over. Playback as
required to greet customers etc. Volume control &
built-in mic. 6VDC. PCB 50x73mm.
3131KT £12.95
*
TRAIN SOUNDS
4 selectable sounds : whistle
blowing, level crossing bell, ‘clickety-clack’ & 4 in
sequence.
SG01M £6.95
*
PC CONTROLLED RELAY BOARD
Convert any 286 upward PC into a dedicated
automatic controller to independently turn on/off
up to eight lights, motors & other devices around
the home, office, laboratory or factory using 8
240VAC/12A onboard relays. DOS utilities, sample
test program, full-featured Windows utility & all
components (except cable) provided. 12VDC. PCB
70x200mm.
3074KT £31.95
*
2 CHANNEL UHF RELAY SWITCH
Contains the
same transmitter/receiver pair as 30A15 below plus
the components and PCB to control two
240VAC/10A relays (also supplied). Ultra bright
LEDs used to indicate relay status.
3082KT £27.95
*
TRANSMITTER RECEIVER PAIR
2-button keyfob
style 300-375MHz Tx with 30m range. Receiver
encoder module with matched decoder IC.
Components must be built into a circuit like kit 3082
above.
30A15 £14.95
*
PIC 16C71 FOUR SERVO MOTOR DRIVER
Simultaneously control up to 4 servo motors. Software &
all components (except servos/control pots) supplied.
5VDC. PCB 50x70mm.
3102KT £15.95
*
UNIPOLAR STEPPER MOTOR DRIVER
for any
5/6/8 lead motor. Fast/slow & single step rates.
Direction control & on/off switch. Wave, 2-phase &
half-wave step modes. 4 LED indicators. PCB
50x65mm.
3109KT £14.95
*
PC CONTROLLED STEPPER MOTOR DRIVER
Control two unipolar stepper motors (3A max. each)
via PC printer port. Wave, 2-phase & half-wave step
modes. Software accepts 4 digital inputs from exter-
nal switches & will single step motors. PCB fits in D-
shell case provided.
3113KT £17.95
*
12-BIT PC DATA ACQUISITION/CONTROL UNIT
Similar to kit 3093 above but uses a 12 bit Analogue-
to-Digital Converter (ADC) with internal analogue
multiplexor. Reads 8 single ended channels or 4 dif-
ferential inputs or a mixture of both. Analogue inputs
read 0-4V. Four TTL/CMOS compatible digital
input/outputs. ADC conversion time <10uS. Software
(C, QB & Win), extended D shell case & all compo-
nents (except sensors & cable) provided.
3118KT
£52.95
*
LIQUID LEVEL SENSOR/RAIN ALARM
Will indi-
cate fluid levels or simply the presence of fluid. Relay
output to control a pump to add/remove water when it
reaches a certain level.
1080KT £5.95
*
AM RADIO KIT 1
Tuned Radio Frequency front-
end, single chip AM radio IC & 2 stages of audio
amplification. All components inc. speaker provid-
ed. PCB 32x102mm.
3063KT £10.95
*
DRILL SPEED CONTROLLER
Adjust the speed
of your electric drill according to the job at hand.
Suitable for 240V AC mains powered drills up to
X
FACTOR
PUBLICATIONS
THE EXPERTS IN RARE &
UNUSUAL INFORMATION!
Full details of all X-FACTOR PUBLICATIONS can be found in
our catalogue. N.B. Minimum order charge for reports and plans
is £5.00 PLUS normal P.&P.
*
SUPER-EAR LISTENING DEVICE
Complete plans to
build your own parabolic dish microphone. Listen to distant
voices and sounds through open windows and even walls!
Made from readily available parts.
R002 £3.50
*
LOCKS
- How they work and how to pick them. This fact
filled report will teach you more about locks and the art of
lock picking than many books we have seen at 4 times the
price. Packed with information and illustrations.
R008 £3.50
*
RADIO & TV JOKER PLANS
We show you how to build three different circuits for disrupt-
ing TV picture and sound plus FM radio! May upset your
neighbours & the authorities!! DISCRETION REQUIRED.
R017 £3.50
*
INFINITY TRANSMITTER PLANS
Complete plans for
building the famous Infinity Transmitter. Once installed on the
target phone, device acts like a room bug. Just call the target
phone & activate the unit to hear all room sounds. Great for
home/office security!
R019 £3.50
*
THE ETHER BOX CALL INTERCEPTOR PLANS
Grabs
telephone calls out of thin air! No need to wire-in a phone
bug. Simply place this device near the phone lines to hear the
conversations taking place!
R025 £3.00
*
CASH CREATOR BUSINESS REPORTS
Need ideas for
making some cash? Well this could be just what you need!
You get 40 reports (approx. 800 pages) on floppy disk that
give you information on setting up different businesses. You
also get valuable reproduction and duplication rights so that
you can sell the manuals as you like.
R030 £7.50
Great introduction to electronics. Ideal for the budding elec-
tronics expert! Build a radio, burglar alarm, water detector,
morse code practice circuit, simple computer circuits, and
much more! NO soldering, tools or previous electronics
knowledge required. Circuits can be built and unassembled
repeatedly. Comprehensive 68-page manual with explana-
tions, schematics and assembly diagrams. Suitable for age
10+. Excellent for schools. Requires 2 x AA batteries.
ONLY £14.95
(phone for bulk discounts).
AIN
ARG !!
B UY
B
Electronic Projects Lab
30-in-ONE
WEB: http://www.QuasarElectronics.com
email: epesales@QuasarElectronics.com
Secure Online Ordering Facilities
Full Kit Listing, Descriptions & Photos
Kit Documentation & Software Downloads
392
Everyday Practical Electronics, June 2001

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