Electronics has been my profession for well over a
quarter of a century and my hobby for even
longer. Over that whole period, I have been an
avid collector of knowledge of the subject, so that
by now my card index system contains references
to hundreds of articles published during that time.
Now references are all very well, but one often
needs information in a hurry, so it has been my
practice, more often than not, also to save the
article itself. Thus I now have, stored in many
bulging files, an invaluable hoard of articles,
photocopies and originals, from dozens of maga-
zines, books and learned journals. For some years
the feeling has been growing that I should not sit
on all this information, but should share it around.
Of course, it is all freely available already, in the
various publications in which it originally ap-
peared, but that makes it a very diffuse body of
knowledge and consequently very elusive. In this
book I have tried to bring some of it together,
concentrating on what I have found over the years
to be the most useful, and seeking to explain it as
simply as possible. Whether or not I have suc-
ceeded, the reader must judge for himself.
This book is not a textbook, but I hope never-
theless that you will learn a good deal from it.
Textbooks have traditionally presented a great
deal of information compressed within a relatively
confined space- a format which is appropriate in
conjunction with a course including lessons or
lectures, at a school, polytechnic or university.
However, it makes life very difficult for the student,
however keen, who is working on his own with no
one to consult when something is not clear. It must
be said also that some textbooks seem to delight in
the most abstract treatment of the subject, dragging
in degree-level maths at every turn, even when a
more concrete approach- using simple vector
diagrams, for example-would be perfectly satisfac-
tory and much more readily comprehensible to
normal mortals. On occasions even,