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Subject: Re: Triac controlled holiday lights
Date: Mon, 2 Dec 2002 03:00:19 +0100 (CET)
Steve W.EE wrote:
: Each letter in the display has from 10-20 lights
: in it. In the past I was able to get strings
: of 100 lights which were wired in 5 circuits of
: 20 bulbs. We'd put the bulbs we want in front
: then hide the remainder of the 20 in the back.
: Problem now is that all the strings of 100
: mini-lights are wired in 2 groups of 50 bulbs
: in series.
What you ought to do is get a constant-current drive set it to how many
mils the bulb draws then you could string any number of bulbs up to 50
and they'd be at the right brightness.
Sort of like the circuit in Tennesee's electric chair but of course the
voltage and current would be less. The electric chair is set to provide
2640 volts but limit the current to something like 10 amps. It's
something built on triacs and some type of current sensing.
The guy who designed it, Fred Leuchter was a real weirdo. He designed
electric chairs, gas chambers, lethal injection machines. He had quite a
good business going until he was hired to go to Auschwitz go in and chip
away and collect rock samples. He had them analyzed and since there was
no cyanide in them, he issued a report that the Holocaust never happened.
The chemistry he used was so bad it was laughable. Afterward, no one
wanted to hire him anymore to build execution equipment.
Go rent the movie Mr. Death it's about 1 1/2 hours long chronicling the
life of Leuchter. Very interesting, they even had a schematic of the
electric chair I paused it there but could not see much just a few 4066
silicon switches. There are websites like http://www.theelectricchair.com
which have details on how the electric chairs work.
Leuchter claims that the electric chair renders someone unconscious in
1/240 of a second or a quarter cycle at the US rate of 60 Hertz.
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