Tune that dial - Index of

CONTENTS
Did someone ring? 4
A touch more bling, perhaps? 5
Empty battery? 6
Lord and master! 7
Battery saver circuit 7
Battery indicator for the caravan 8
When the siren sounds… 9
Temperature-controlled switch 10
Check your contacts 11
Check Out Your LEDs 12
It’s Wet! 13
Dicing with LEDs 14
Surf simulator 15
Save Your Ears 17
Electronic poltergeist 18
Pump it up: MP3 booster 19
Musical saw 20
Luminous house number 22
Applause generator 23
collection
Circuits Allsorts
This December 2006 issue of Elektor Electronics comes
with a free collection of simple yet useful and sometimes
playful circuits for home construction. The circuits, we hope
and expect, are easily understood and reproducible and
should appeal to the less advanced electronics enthusiast,
although more experienced readers are also bound to
fi nd interesting bits and bobs to help them through the
dark winter evenings in a pleasant and educational way.
A deafening siren that will make burglars run off
— electronic dice adds fun to games — a lighting house
number helps your friends and acquaintances fi nd your
home more easily in the dark. Do you want to stand out
from the crowd in the local disco, or encourage annoying
visitors to leave early, with a bit of help from an electronic
poltergeist? All these, and more, circuits may be found
in this 24-page i-TRIXX supplement, which is offered to
you free of charge.
All i-TRIXX circuits in this supplement originate from
the Elektor labs and are spin-offs from larger projects,
scribblings on the back of envelopes, dead-bug fi ddling,
‘quick and dirty’ solutions, or even design ideas that
eventually became so intriguing the designer just had
to develop it out for enthusiasm, curiosity and technical
satisfaction — all at the same time in not a few cases.
In this respect, i-TRIXX are truly ‘tricks of the trade’ that
got pencilled down and eventually — with the help of
our editorial team — made it to this publication in print
instead of just ending up in a drawer or the more
contemporary Windows Recycle Bin.
From over 30 years experience in publishing for electronics
enthusiasts all over the world we know that the Christmas
holidays are a great time for fun circuits that cost next to
nothing to build, often from parts found in the junkbox
(now’s a good time to clean it out!). Especially newcomers
to the hobby will fi nd i-TRIXX useful to learn about the
process that begins with the ability to ‘read’ a circuit
diagram and culminates in powering up a fully working
prototype.
Have fun with the i-TRIXX collection!
Jan Buiting, Editor