5 Dec
1998
5 Dec
'98
11:56 a.m.
the disks and he gave me one, a Maxtor. I had it on a
pc, laying
on top of a table and one day it went "BLAM!" like someone set
off a firecracker, and the pc shut down. Turned power off/on and it
came right back like nothing had happened! Turned out to be
<a reversed biased
diode across the power lines let got - nothing
important.
Ah - you got one of those special NED's (Noise Emitting Diodes),
I see.
Tim.
6 Dec
6 Dec
4:04 a.m.
CLASSICCMP(a)trailing-edge.com wrote:
Some people have all the luck -- I've never seen (or heard) a
noise-emitting diode. Lots of smoke-emitting diodes and
light-emitting resistors in the past, however. And of course the
occasional glop-emitting capacitor.
--
Ward Griffiths <mailto:gram@cnct.com> <http://www.cnct.com/home/gram/>
WARNING: The Attorney General has determined that Alcohol, Tobacco,
and Firearms can be hazardous to your health -- and get away with it.
the disks and he gave me one, a Maxtor. I had it
on a pc, laying
on top of a table and one day it went "BLAM!" like someone set
off a firecracker, and the pc shut down. Turned power off/on and it
came right back like nothing had happened! Turned out to be
<a reversed biased
diode across the power lines let got - nothing
important.
Ah - you got one of those special NED's (Noise Emitting Diodes),
I see. 
7 Dec
7 Dec
4:31 a.m.
Some people have all the luck -- I've never seen
(or heard) a
noise-emitting diode. Lots of smoke-emitting diodes and
light-emitting resistors in the past, however. And of course the
occasional glop-emitting capacitor.
Take a 3.5 volt top hat LED. Spread the leads to the proper
width and apply (I would recommend using a pair of pliers)
to a fresh 9 volt transistor radio battery. I got shards of
red plastic embedded in my fingers that way once.
6:31 a.m.
Bill Sudbrink wrote:
Ah, a shrapnel-emitting diode. Safety glasses and gloves would
seem to be recommended.
--
Ward Griffiths <mailto:gram@cnct.com> <http://www.cnct.com/home/gram/>
WARNING: The Attorney General has determined that Alcohol, Tobacco,
and Firearms can be hazardous to your health -- and get away with it.
Some people have all the luck -- I've never
seen (or heard) a
noise-emitting diode. Lots of smoke-emitting diodes and
light-emitting resistors in the past, however. And of course the
occasional glop-emitting capacitor.
Take a 3.5 volt top hat LED. Spread the leads to the proper
width and apply (I would recommend using a pair of pliers)
to a fresh 9 volt transistor radio battery. I got shards of
red plastic embedded in my fingers that way once. 
6:42 a.m.
[shrapnel-emitting diode]
What about the Heat Emitting IC?
Oh, and I've heard a Noise Emitting CRT - Some moron dropped a monitor on it's
back and neatly cracked the CRT neck (and thus shorted all the pins together)
and didn't tell anyone about it. Teacher turns it on and it makes smoke
and loud disturbing-type noises. So, she calls me in to go fix it. I take
monitor back to workshop, open back of it, (Yes, I know how dangerous this
is, I just wanted to see what was making that noise.), then shoved the power
cord into a powerstrip with a breaker on it, stood a good 3 feet away and let
it have juice. I then stared in horror at the light show. We let it sit for
about 2 hours, then brought the teacher in to see it. She sez, "Oh, well, can
you fix it?"
There's also the gum-emitting belt (I got to clean one of these out of an
NCR 260 terminal yesterday) and the crap-emitting battery (Seen on our 286es
and an increasing number of 386es), and the sound-emitting transformer.
-------
8:35 a.m.
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9:47 a.m.
[shrapnel-emitting diode]
What about the Heat Emitting IC?
Those are entirely too common, in my experience.
The most bizarre thing I've seen along these lines, however,
was the light-emitting EPROM.
One day I noticed that:
1) My Apple ][ was acting somewhat flaky.
2) The 80-column video card, a Videx Videoterm, was getting
rather warmer than usual.
3) There was light coming from the video card.
I put the card on an extender, and determined that the
source of light was the firmware EPROM! There was an arc
between two of the bond wires. The EPROM was a 2708 EPROM,
which you will recall used three power supplies, +5, +12,
and -5V.
Amazingly, the EPROM was still completely functional,
as the 80-column card was working fine. But it was
pulling the Apple's 12V supply down to about 8V, which
was causing other things to flake out.
I replaced the EPROM, and unfortunately I didn't think to
save the arcing one.
Just at a guess, I'd imagine that the spectra of light
emitted by the arc probably included enough short-wave
UV that the EPROM would eventually have erased itself.
10:15 a.m.
Yeah those LED's with a 9v or bigger battery are always good to keep in
your back pack for starting campfires, you just have to steer clear
while they shed the outer jacket (g)
Eric Smith wrote:
[shrapnel-emitting diode]
What about the Heat Emitting IC?
Those are entirely too common, in my experience.
The most bizarre thing I've seen along these lines, however,
was the light-emitting EPROM.
One day I noticed that:
1) My Apple ][ was acting somewhat flaky.
2) The 80-column video card, a Videx Videoterm, was getting
rather warmer than usual.
3) There was light coming from the video card.
I put the card on an extender, and determined that the
source of light was the firmware EPROM! There was an arc
between two of the bond wires. The EPROM was a 2708 EPROM,
which you will recall used three power supplies, +5, +12,
and -5V.
Amazingly, the EPROM was still completely functional,
as the 80-column card was working fine. But it was
pulling the Apple's 12V supply down to about 8V, which
was causing other things to flake out.
I replaced the EPROM, and unfortunately I didn't think to
save the arcing one.
Just at a guess, I'd imagine that the spectra of light
emitted by the arc probably included enough short-wave
UV that the EPROM would eventually have erased itself. 
11:04 a.m.
Eric Smith wrote:
Just at a guess, I'd imagine that the spectra of
light
emitted by the arc probably included enough short-wave
UV that the EPROM would eventually have erased itself.
Ahh the very first EEPROM ? ;-)
_---_--__-_-_----__-_----_-__-__-_-___--_-__--___-__----__--_--__-___-
Hans B Pufal Comprehensive Computer Catalogue
<mailto:hansp@digiweb.com> <http://digiweb.com/~hansp/ccc>
10:05 a.m.
New subject: breaking monitors (was Re: old(ish) computers for sale)
Daniel A. Seagraves writes:
Oh, and I've heard a Noise Emitting CRT - Some
moron dropped a monitor on
it's back and neatly cracked the CRT neck
Ten years ago I managed to crack the neck of the CRT in a Macintosh SE
computer. Some of the motherboard connectors are fairly difficult to
disengage, and the direction you have to yank on them lead directly to the
neck.
Five years and two moves ago, I was carrying a Sony KV25DXR television (a
beautiful piece, the sibling of the first XBR) down the stairs by myself. The
stairs were narrow, and had two 90-degree turns.
[Don't try this at home. Professional driver on closed track. Odds of
winning may vary.]
I got the set all the way down the stairs, out the gate, and within a few
feet of the car, when the power cord slipped out of my hand and tripped me.
I dropped the TV and fell on it.
[Hmmm... not such a professional driver after all!]
Luckily for me, the tube didn't implode, or I probably would have been
seriously injured. The pastic casing of the TV broke in several places, and I
heard a hissing noise for about ten seconds. Having heard that noise before
from the Macintosh SE, I immediately concluded that the
neck of the CRT
had cracked.
Since it was near the car anyhow, and there wasn't a dumpster nearby, I
loaded the TV into the car, and unloaded it into the garage of the new
house.
A few days later I decided to plug in the TV just to see what would happen.
Imagine my astonishment when the thing actually worked!
To this day I don't know what the hissing sound was. Friends have suggested
that perhaps *I* made the sound, but I don't think so. I still have the TV,
and it still works. As well as it did before I dropped it, anyhow. It had
some minor problems ever since the Loma Prieta earthquake in 1989; I think a
surge when the power was restored must have zapped its poor little
microprocessor. If only the picture wasn't so good, I'd throw the thing away,
but I guess it's destined to be an albatross about my neck until the end of my
days. Or at least until the FCC makes the broadcasters abandon analog NTSC.
This was the same move in which I tore a flap of skin from the middle finger
of my right hand, and got to see first-hand what tendons look like, but
that's another story.
Eric
12:58 p.m.
New subject: breaking monitors (was Re: old(ish) computers for sale)
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10 comments
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ard＠p850ug1.demon.co.uk -
bill＠chipware.com -
CLASSICCMP＠trailing-edge.com -
DSEAGRAV＠toad.xkl.com -
eric＠brouhaha.com -
gram＠cnct.com -
hansp＠digiweb.com -
rhblake＠bigfoot.com