This is only a preview of the July 1993 issue of Silicon Chip. You can view 37 of the 96 pages in the full issue, including the advertisments. For full access, purchase the issue for $10.00 or subscribe for access to the latest issues. Articles in this series:
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Items relevant to "Light Beam Relay Extender":
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Publisher & Editor-in-Chief
Leo Simpson, B.Bus.
Editor
Greg Swain, B.Sc.(Hons.)
Technical Staff
John Clarke, B.E.(Elec.)
Robert Flynn
Darren Yates, B.Sc.
Reader Services
Ann Jenkinson
Sharon Macdonald
Marketing Manager
Sharon Lightner
Phone (02) 979 5644
Mobile phone (018) 28 5532
Regular Contributors
Brendan Akhurst
Garry Cratt, VK2YBX
Marque Crozman, VK2ZLZ
John Hill
Jim Lawler, MTETIA
Bryan Maher, M.E., B.Sc.
Philip Watson, MIREE, VK2ZPW
Jim Yalden, VK2YGY
Bob Young
Photography
Stuart Bryce
SILICON CHIP is published 12 times
a year by Silicon Chip Publications
Pty Ltd. A.C.N. 003 205 490. All
material copyright ©. No part of
this publication may be reproduced
without the written consent of the
publisher.
Printing: Macquarie Print, Dubbo,
NSW.
Distribution: Network Distribution
Company.
Subscription rates: $42 per year
in Australia. For overseas rates, see
the subscription page in this issue.
Editorial & advertising offices:
Unit 1a/77-79 Bassett Street, Mona
Vale, NSW 2103. Postal address:
PO Box 139, Collaroy Beach, NSW
2097. Phone (02) 979 5644. Fax
(02) 979 6503.
PUBLISHER'S LETTER
Old textbooks &
data books are
valuable
Do you have old electronics data books and reference
books that you are considering throwing out? Possibly
they are taking up space and
you haven’t referred to them
for awhile, so you now think
you should throw them out.
Think again, we say. At SILICON CHIP we have a policy of not throwing out any semiconductor data book
even though we have later editions which ostensibly render them obsolete.
The reason for not throwing the books out is that they are the only source
of data on components which are no longer made. The new data books from
manufacturers only feature devices which are currently being manufactured
at the time the book was sent to the printer. If you routinely throw data books
out, there is a strong chance you will regret it in the future when you need
to refer to data which is no longer in print.
This problem is bigger than you might think. Currently, there are about
one million semiconductors which are presently available and about half a
million which are obsolete and this latter number is probably growing faster
than the number of new devices being released. Even the most comprehensive
data services tend to keep only short form data on obsolete semiconductors
so once you throw a data book out, that’s it; it’s gone.
This tendency to throw out seemingly useless books extends to many
TAFE, university and state libraries – they are running out of space and so
they tend to throw out the older books which are now being referred to less
often. We are appalled at this policy. We think that such libraries should
regard older books as a valuable archive of technology as it was - the very
foundations on which present day technology is based. If we throw out
the older stuff, how are future generations going to know how much of
our technology came about? More important, how can new and innovative
technology be developed without a broad knowledge base, a base which is
ultimately stored in the reference libraries across the country?
What can be done about it? First, think twice about throwing out old
reference and data books – you might need them in future. Second, keep an
eye out at your local reference library for books which may be on sale for
a song. And third, indicate to your librarian that you think their policy of
throwing technical books out is ill-advised and short-sighted.
Leo Simpson
ISSN 1030-2662
WARNING!
SILICON CHIP magazine regularly describes projects which employ a mains power supply or produce high voltage. All such projects should
be considered dangerous or even lethal if not used safely. Readers are warned that high voltage wiring should be carried out according to the
instructions in the articles. When working on these projects use extreme care to ensure that you do not accidentally come into contact with
mains AC voltages or high voltage DC. If you are not confident about working with projects employing mains voltages or other high voltages,
you are advised not to attempt work on them. Silicon Chip Publications Pty Ltd disclaims any liability for damages should anyone be killed
or injured while working on a project or circuit described in any issue of SILICON CHIP magazine. Devices or circuits described in SILICON
CHIP may be covered by patents. SILICON CHIP disclaims any liability for the infringement of such patents by the manufacturing or selling of
any such equipment. SILICON CHIP also disclaims any liability for projects which are used in such a way as to infringe relevant government
regulations and by-laws.
Advertisers are warned that they are responsible for the content of all advertisements and that they must conform to the Trade Practices Act
1974 or as subsequently amended and to any governmental regulations which are applicable.
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