free solution and is VERY versatile! Of
course, you can also use a recording
of pink noise played back with a program like "winamp" using a "cross
fade" plug-in to cause the end of the
"song" to overlap with the beginning
so you get a continuous noise source.
Winamp is available at www.winamp.
com and a cross fade plug-in for it is
available at www.winamp.com/plug
ins/ details.php?id=146142 Hope this
helps. Here's to a good day’s sleep!
[#5064 - May 2006]
How are fireworks controlled in
the big July 4th shows? They must
be computer controlled because the
rockets, roman candles, etc., go off at
closely spaced times. What is the interface between the fuses and computer;
and, how are the signals distributed?
rent at which all devices should fire.
Given the need for extreme safety —
we are dealing with explosives here —
these systems have to be built for very
high reliability under sometimes
very adverse conditions. The interface
between the computer and the E-match may be all electronic, or elec-tro-mechanical, using relays for the
actual firing circuit. The signals are distributed via multi-wire cables, cat- 5
cables, telephone wire, two-strand
wire, or wireless, depending on the
system being used. The software to
choreograph the shows is very
complex and expensive, as it has a
very small market.
#1 Most of the large shows are
fired with computer controlled firing
systems from companies like FireOne,
PyroMate, and many others. The
actual devices are ignited by "E-matches," which are typically actuated by anywhere from 12V to over
300V signals at about one amp.
The E-matches are characterized
by a "no-fire" current, which specifies
a safe current that can be used for
continuity testing, and an "all-fire" cur-
#2 I would suggest you try the
following websites. Not only is there a
lot of ideas on this matter, there are
also safety tips/issues and such.
Better safe than sorry! For a simple
firing system, try www.pyrouniverse.
com/ f-system.htm I would highly suggest you take a look at their home
page too — great info. Another site
that I like is www.skylighter.com
For the Nichrome wire (will light
a fuse when current is applied), check
Hope it helps and Happy Fourth!
North Judson, IN
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