Advice Please: Should kids take apart electronic devices?
Todd Cranston-Cuebas
apart household appliances to check out how they work. I'm worried that the
kids can get hurt. Some time ago, when I used to work on my Macintosh SE/30,
I had to discharge the monitor to keep from getting shocked. I found out
from my son that the six-year-olds were disassembling a computer monitor and
TV the other day. Are these devices as dangerous as the old Mac monitors?
They also remove a lot of the board components in, well...a less than
delicate way. They smash them off! Many of the components are cracked or
break open. Are there hidden dangers here?
I don't want to be a wet blanket since the kids love this part of their
curriculum and they've been doing this at the school for years. I just don't
want my son, and the other kids, inadvertently hurt.
Any advice would be appreciated.
TCC
---------------------------------------------------------------/
Todd Cranston-Cuebas /
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T H E S T I C K Y M O N K E Y D E S I G N G R O U P /
a division of SC Consulting Corporation /
http://www.scconsulting.com /
t...@scconsulting.com /
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Rudolf Ladyzhenskii
supervision.
TVs and monitors picture tubes must be dicharged and some precautions must
be taken so that kids will not break the tubes.
Another hidden danger is sharp edges inside of the equipment. It is very
easy to cut yourself on the metal chassis.
>They also remove a lot of the board components in, well...a less than
>delicate way. They smash them off! Many of the components are cracked or
>break open. Are there hidden dangers here?
Some components do contain dangerous elements, tranistors for example, but I
doubt they can beak transistor open.
What I do not like is the fact they break the board to get components out.
Certainly, there is no educational value in that. And I hope that someone is
there with them to explain them how things are working.
Rudolf
Robert Hancock
voltages and a tube which can implode violently if broken. Microwaves also
can store dangerously high voltages - although they usually don't stay
charged for long.
I don't think internal components would present any real danger, I assume
they're not eating the parts or anything like that :-)
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hanc...@nospamhome.com
Home Page: http://members.home.net/hancockr
Todd Cranston-Cuebas <t...@scconsulting.com> wrote in message
news:cVcN3.1123$n51....@news.inreach.com...
> My kid's school has a really cool "take-apart corner" where the kids tear
> apart household appliances to check out how they work. I'm worried that
the
> kids can get hurt. Some time ago, when I used to work on my Macintosh
SE/30,
> I had to discharge the monitor to keep from getting shocked. I found out
> from my son that the six-year-olds were disassembling a computer monitor
and
> TV the other day. Are these devices as dangerous as the old Mac monitors?
>
> They also remove a lot of the board components in, well...a less than
> delicate way. They smash them off! Many of the components are cracked or
> break open. Are there hidden dangers here?
>
Tom MacIntyre
<t...@scconsulting.com> wrote:
>My kid's school has a really cool "take-apart corner" where the kids tear
>apart household appliances to check out how they work. I'm worried that the
>kids can get hurt. Some time ago, when I used to work on my Macintosh SE/30,
>I had to discharge the monitor to keep from getting shocked. I found out
>from my son that the six-year-olds were disassembling a computer monitor and
>TV the other day. Are these devices as dangerous as the old Mac monitors?
Dangerous, dangerous...it depends upon the age of the kids, but I
hardly think the educational value of this excercise outweighs the
danger, with the potential for limiting/halting the rest of their
education in so many other disciplines. I'll bet there's no HV probe,
or even protective goggles/clothing being used. If I'm wrong, they're
at least on the right track there.
>
>They also remove a lot of the board components in, well...a less than
>delicate way. They smash them off! Many of the components are cracked or
>break open. Are there hidden dangers here?
It depends on what, but there's probably less, if any, danger here,
other than cuts from sharp edges.
>
>I don't want to be a wet blanket since the kids love this part of their
>curriculum and they've been doing this at the school for years. I just don't
>want my son, and the other kids, inadvertently hurt.
I'm a big believer in education, but my question is...WHY? What are
they learning here? A few brief peeks inside a few devices would give
them the idea of what's inside; some de-soldering sessions would
enable them to learn how to remove and replace components, and to
learn to identify various components...to learn how the components
work together, another approach is required. Unless I'm missing the
full description, there is more mindless distraction here than
education. Perhaps if someone pops a CRT, then they'll get an
education?
Tom
Brian Swann
and microwaves, and stick to the CD players, radios and the like. Even
better would be limiting it to battery powered stuff.
You didn't mention the age of the kids, and the supervision level. This is
definately suspect.
Tom MacIntyre <tmac...@ns.sympatico.ca> wrote in message
news:3805b17e...@news.wolf...
Lenny
My younger boy, who is 16 has always been curious as to how things work.
Just the way I was in fact. I recall completely disassemling the
telephone, (the only telephone) in our house when I was eight, and then
being made to watch as the crusty old telephone man who handed me quite
a tongue lashing too, whom my parents were forced to call from New York
Telephone put it back together.
The joke around our house still is that during my son's toddler years,
and beyond as well, we never could find a pen around here with a spring
in it! He just needed to see how it worked. In fact he would take apart
everything! At first it was maddening, but after awhile I realized that
this is behavior which should be fostered and guided, and I started
letting him sit with me at the bench, open up VCR's and take apart
junkers. I never let him work around a CRT or a possible charged cap
though. I didn't feel that would be an important part of this particular
learning experience.
I think that the school program that was mentioned could be a good thing
as long as it is not just "a tear it apart and smash it up" session. In
my case, for example if we removed a cassete load motor, We connected it
up to a battery for demonstration, and might have built something with
it afterwards. (They are very good high torque little motors, you know).
I always insisted that if he take it apart he should be able to put it
back together. Because without that the experience is useless.
As a result of my particular experience, today Jesse is very self
sufficient, with a solid inclination toward mechanics. Now oftentimes
when his mother needs something fixed she asks him instead of me.
Sometimes investments pay dividends you would never expect. Lenny Stein.
Sam Goldwasser
I would rather see someone who is at least somewhat knowledgeable do the
taking apart and explain in simple terms what the parts do. Smashing
things is not educationion IMO (but could be lots of fun I guess).
Dangers:
Charge capacitors in monitors, TVs, microwaves, many other types of electronic
equipment though except for the CRT, everything else is almost certainly
fully discharged before the kids would get their hands on them.
CRT implosion.
Sharp sheep metal edges.
Toxic substances in batteries and maybe some capacitors. I don't consider
transistor a hazard as despite the fact that they contain elements like
arsenic, the amounts are negligible not in a form that can get out.
Of course, there is the 2 inch thick layer of dust and grime!
--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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In article <93987734...@busy.neca.nec.com.au> "Rudolf Ladyzhenskii" <rud...@icpdd.neca.nec.com.au> writes:
Certainly this is educational experience, but must be done under close
supervision.
TVs and monitors picture tubes must be dicharged and some precautions must
be taken so that kids will not break the tubes.
Another hidden danger is sharp edges inside of the equipment. It is very
easy to cut yourself on the metal chassis.
>They also remove a lot of the board components in, well...a less than
>delicate way. They smash them off! Many of the components are cracked or
>break open. Are there hidden dangers here?
Some components do contain dangerous elements, tranistors for example, but I
BOB URZ
take apart tv's. I used to clip parts out of old junk ones. While caution is in
order, I think this is good. Too many people don't have a clue what goes on
inside and what it looks like. This industry will be in big trouble if we don't
get more people involved and interested in it. How many NEW repair shops do you
see opening up? How many are looking for help they cannot find? Been to a HAM
radio club meeting lately? How many under 20 year olds to you see?
We must do something to get the kids of today interested in tomorrow. I did not
touch a computer until I was in college. My 4 year old plays Tonka Garage on my
home PC now. I built Heath kits when I was 10+ and learned a lot. Where are the
Heath kits today? I am all for whatever we can do to get the kinds interested in
electronics and what we do.
BOB URZ
Todd Cranston-Cuebas wrote:
> My kid's school has a really cool "take-apart corner" where the kids tear
> apart household appliances to check out how they work. I'm worried that the
> kids can get hurt. Some time ago, when I used to work on my Macintosh SE/30,
> I had to discharge the monitor to keep from getting shocked. I found out
> from my son that the six-year-olds were disassembling a computer monitor and
> TV the other day. Are these devices as dangerous as the old Mac monitors?
>
> They also remove a lot of the board components in, well...a less than
> delicate way. They smash them off! Many of the components are cracked or
> break open. Are there hidden dangers here?
>
> I don't want to be a wet blanket since the kids love this part of their
> curriculum and they've been doing this at the school for years. I just don't
> want my son, and the other kids, inadvertently hurt.
>
Steve TR
monitor?!?
No way should kids be messing with that type of item. Portable radios, old
VCRs, tape decks, etc.... yeah. NO HIGH VOLTAGE or
GLASS/IMPLOSIVE/EXPLOSIVE items!! Just NO!
Look, I'm not a professional technician. Probably never will be because
I'm more into computer hardware, but all my life I've been absolutely
fascinated with electronics. I can remember from an early age I was always
salvaging anything with a plug (or battery powered) from trash or dumpers
because I wanted to have a go at it. There have been numerous items people
have thrown away because of simple problems. I've learned quite a bit of
basic electronic/electrical skills by taking old items and experimenting
with it. Also made quite a bit of money by salvaging and repairing then
selling the old electronics. ANYWAY, I'm trying to get to the fact that
there are certain items that are not safe to experiment or mess with.
Televisions and microwave ovens are on top of my list. I will work with TV
monitors, but I know to use caution around the fragile CRT and to use
extreme caution around the flyback or any other extremely high-voltage
devices lurking inside. Not to mention the slight possibility of
X-radiation if something goes awry in the set. Microwaves I will also
check out for people. BUT, I know that inside every microwave there is a
large transformer, there is a large capacitor, and there is a big thingy
(Magnetron) that emits the microwave radiation. I will never attempt to
mess with these as I do not have the proper skils. The rest of the circuits
are typically for the timer, fan, light and controls and are somewhat safe
as they only typically deal with line current. This is not saying that you
can't get a dangerous shock from those components. Not too long ago, an
elderly lady friend of mine who doesn't have all that much money called me
up asking if I could look at her microwave. I relucatantly said okay
because I'm no pro at this and I avoid micros as it is. She hauled the
thing to a shop and they wanted $65.00 just to open it up and look at it.
She couldn't really afford that. Anyway, using my little bit of smarts,
the first thing I checked was the AC Line fuse 'cause the microwave was
just dead. No NOTHING when plugged-in. My common sense would say that it
ain't getting any AC power....start with the fuse. The line fuse was
blown. Now, this would suggest sometihing wasn't operating properly in the
microwave and possibly shorted. So I check all the wiring for any obvious
shorts or broken connections, etc. After everything looked "good," it was
time to try a new fuse. It took cheap-o 15 amp BUSS fuses...I had plenty
to spare. And of course, I do my testing outside plugged into a GPF outlet
in case we decide that there should be lots of smoke or sparks! ;-) I put
the new fuse in and the microwave display operates. Okay, so maybe the
problem occurs only under load...when heating. I put a cup of water in the
thing, set the timer for a minute, and stand back as I hit the START
button....expecting the worse! Everything works fine. Heats the water.
No overheating components, burning wires, etc. Bump the time up to five
minutes. Still good to go. I test it out all day long and it works
fine. I decide that it was probably just an old fuse and that was why it
let go. After all, the wire in the fuse was just broken in two...not
melted all along like some fuses do when there is a surge of current. I
decide that it's "fixed." Four months later her microwave is still
operating and she's happy.
I have many similar stories with things like VCRs, cassette decks, radios
and TVs. When something breaks or isn't working, friends call me first.
VCRs that eat tapes: Check the gears first! VCRs that have nothing but
snow or bad pictures: Check tape path items for dirt or debris...clean
heads...etc. Of course there are always more serious problems such as a
component that is actually dead or not working. I can only work on those
to a limit because I lack proper training or tools. But I can still apply
common sense testing to items. Like if I see a cracked circuit board or
broken wire. Or maybe a resister that is now black/burned or cracked.
Obviously that will be a problem.
Back to this thread: (I didn't mean to ramble!)
I like to think I have SOME common sense. Ya know, if there is something
glowing red, don't touch it! If something has large, heavy gauge wires
coming out of it, don't touch it! If something has a label that says "no
user servicable parts inside" I laugh and break out the screw drivers! ;-)
If something has a big lightning bolt or WARNING label, I don't touch it
or proceed with caution.
I've always been curious, but *cautious* when it comes to electrical and
electronic items. And that mixed with common sense is something good.
But letting children play with items like television/computer CRTS is not
safe. That is too much of a risk. I know that much. I say NO to
monitors, but OKAY/MAYBE to radios or VCRs.
-Steve
--
http://www.wfeca.net/~stevetr
(Classic 1970's Cadillac Eldorado Convertibles!)
Email address does not contain any spam-blocks.
But please post to Usenet unless a personal reply is called for.
---Original Message As Follows---
Todd Cranston-Cuebas <t...@scconsulting.com> wrote in article
<cVcN3.1123$n51....@news.inreach.com>...
Robert Hancock
think they just get fatigued from the constant on-off cycles.
Sometimes it's the things that you don't expect that can be dangerous. The
HV in a TV set is one example. It's a pretty obvious safety hazard. If you
get shocked by that it is going to be quite painful (and you may have a
reflex action that causes you to hit something and injure yourself), but the
amperage is quite low, so I don't think serious injury is very likely. Now,
the amps available from the filter caps in the switching power supply (as
also found in computers, VCRs to some extent) are probably more likely to
actually harm you.
Microwave caps are another example, they store a pretty hefty current. As
the FAQ points out they are supposed to have internal bleeder resistors, but
they can fail and can take a few minutes to discharge the cap. Another one
is the high voltage capacitor in electronic camera flashes. I bet even the
little compact camera flashes' storage cap could hold enough current to
injure or even kill a person.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hanc...@nospamhome.com
Home Page: http://members.home.net/hancockr
Steve TR <TheBe...@hotmail.com> wrote in message
news:01bf16c5$da8e7200$9f9b150c@steve-tr...
Steve TR
have a pretty large capacitor in some of them!
I shouldn't have rambled like I did...I was sidetracked.
Voltage and current aside, kids should not be around TUBES (such as CRTs)
when the term "smashing apart" was used in the sentence!
I say NO when it comes to TVs and monitors due to the implosion and glass
danger more than high-voltage. I say YES to smaller electronics because
chances are, if they are tearing it apart and using it for this funtime
session, the items are already dead and *hopefully* any current in the caps
will have drained.
That's the way I look at it.... "This thing has been unplugged for a week
and I've shorted all capacitors...God I hope it ain't gonna fry me!" LOL!
;-)
--
http://www.wfeca.net/~stevetr
(Classic 1970's Cadillac Eldorado Convertibles!)
Email address does not contain any spam-blocks.
But please post to Usenet unless a personal reply is called for.
---Original Message As Follows---
Robert Hancock <hanc...@nospamhome.com> wrote in article
<N6zN3.226$Ey.2...@news1.sshe1.sk.home.com>...
Sam Goldwasser
> Microwave caps are another example, they store a pretty hefty current. As
> the FAQ points out they are supposed to have internal bleeder resistors, but
> they can fail and can take a few minutes to discharge the cap. Another one
> is the high voltage capacitor in electronic camera flashes. I bet even the
> little compact camera flashes' storage cap could hold enough current to
> injure or even kill a person.
Disposable cameras are a particularly nasty example because (1) they are so
readily available (2) look totally harmless and (3) the main energy storage
capacitor is designed to be very low leakage so that it can charge and
retain a charge without draining the battery. The average person wouldn't
think a device powered from a single 1.5 V AA cell could be dangerous!
They can still hold a painful charge days or weeks after being used!
And, of course, since the manufacturers assume no one can actually read
anymore, they use those stupid icons to signify danger rather than necessarily
printing: Danger High Voltage!
Rokiah Ismail
line powered stuff at 6, 7 and 8 years old, i knew the safety rules from a book
my folks bought me. the worst i did was blow fuses once in awhile. it was
valuable experience, one of my hobbies was electronics, it has become my career
and i find it fun after 23 years. since my grade school days i've "graduated"
to 1,000A and 275,000V stuff, (fault currents of 48,000A) though i don't deal
with power stuff any more, except some 415V 3-phase stuff, 16A circuits mostly.
now i deal with mainly low voltage low current stuff, though i'll tackle the
high current or high voltage stuff like microwave ovens if i have to.
Tom MacIntyre
<tren...@msn.com> wrote:
Maybe we could let the kids
>>have a field trip with the explosives-disposal division of a police
>>force, to see first-hand how to defuse a bomb...
>>
>>Tom
>
>How about a superfund toxic waste cleanup day? OR what does the inside
>of a reactor core look like, OR "Fun with silver cyanide"
I live a ten-minute walk from one of the worst toxic-waste sites in
North America, and I wouldn't wish that on any kid. Actually, I
thought of a way to demonstrate the danger of CRT's to the kids in a
safe and memorable manner. Take about half a dozen dead CRT's to a
landfill, place them all together in a spot where they will be
bulldozed, and, from a distance, allow the kids to throw fist-sized
rocks at them, having surrounded them with watermelons first. After
all of the CRT's have imploded, they can examine the watermelons for
damage.
The saddest story about CRT danger I heard was here, I believe. A guy
posted a story about a friend who was taking CRT's to be recycled, and
he had 2 or 3 in the cab of his pickup because he ran out of room. He
was in a minor fender-bender, I believe, but was killed by one or more
of the CRT's in the truck having imploded.
Tom
BOB URZ
have seen crt's that were whacked at the back of the neck in the TV
(accidentally), I have never seen the inside of the TV full of glass. Looks
like they just degas. Maybe it matters where you whack em.
BOB URZ
LÄNG0S®
Opinions are irrelevant. Only facts matter.
> If you have a choice between
> burning to death or crossing a minefield, the choice is obvious, but
> if you're going to chance the minefield for fun or sport, well, that
> doesn't make sense to me.
So what is the difference between walking a minefield and playing
baseball? I repeat:
Then I suggest you take them out of violence (gym) class! Any activity
that requires someone to hit a hard ball with a bat as hard as they can
while all the other kids stand in the ball's direction of travel (rather
than safely BEHIND the batter) is a tremendous danger to your child!
> I believe in education, hands-on, but
> there's little or nothing of any value that can be learned from
> stripping down a TV/monitor/MWO from scratch that can't be learned by
> examining one that has been carefully disassembled by a professional,
> or an adult who has full knowledge of the dangers.
You can watch something several times, but will never remember it until
you do it yourself. And there is nothing to be learned from playing
baseball or bombardment ball.
> Implosion of a CRT in the middle of a group
> of 25-30 kids
Has NEVER happened in world history! However many kids have DIED from
school "sports"!
Something to think about.
James Sweet
clean off and air fills the tube. I've had one occasion however when I
tossed a badly phosphor burned 19" tube into the dumpster, but it didn't
quite make it in. The front corner of the funnel part tagged the hinge
of the dumpster, and BOOOOOOOOOOOOM, glass flying, got away without a
scratch, somehow, but I've been way more careful since then.
LÄNG0S®
> have seen crt's that were whacked at the back of the neck in the TV
> (accidentally), I have never seen the inside of the TV full of glass. Looks
> like they just degas. Maybe it matters where you whack em.
No, it matters that you have experienced breaking crts rather than just
repeating old wive's tales that you have HEARD.
Video Services
they are "SPECIAL".
A suggestion from Video Services
www.repaircamcorder.com
Tom MacIntyre wrote in message <380a8b3d....@news.wolf>...
>I've broken some too (I detect that at least part of your message is
>aimed at my earlier post). I've done the controlled "pop the neck off
>the CRT" trick (once, unfortunately, accidentally on a set I was
>repairing), and I saw one throw glass several feet in all directions
>after a group of us stoned it with fist-sized stones. If they aren't
>dangerous, why are there so many warnings? I've never seen a tiger eat
>a man before, but I believe that one will.
>
>Tom
Andy
I think the danger of HV on CRTs and microwave caps and CRTs imploding
has been exagerated a little. I've never seen a TV or microwave hold a
charge for more than a few days. I'm not saying it's impossible, but
highly unlikely. I started taking TVs and other electronics apart
before I even started school. As long as there's proper supervision and
safety rules, it shouldn't be any more dangerous than gym class.
Safetly glasses would be a good idea when you have so many kids around.
I can honestly say it was well worth any risk involved. It's likely to
be FAR more useful than any gym class. I've never had to get a part
time job that pays minimum wage and I've never bought any new
electronics other than small stuff and some computer parts.
--
Andy Cuffe
balt...@psu.edu
Tom MacIntyre
Sam Goldwasser
> Interesting about the implosion. But I wonder how bad it really is. When I
> have seen crt's that were whacked at the back of the neck in the TV
> (accidentally), I have never seen the inside of the TV full of glass. Looks
> like they just degas. Maybe it matters where you whack em.
Usually, you get away with breaking the neck off without catastrophic
consequences. However, there are other spots where this isn't so.
Sam Goldwasser
infinite resistance so do bleed off the charge relatively quickly (but you
still shouldn't assume!). However, in the good old days of tube type HV
rectifiers, charge could hang around for quite some time.
Remember, it isn't 'most' that matters. It's that singularity which may
be the exception! :)
--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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DrVideoRx
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>
>
>
>Interesting about the implosion. But I wonder how bad it really is. When I
>have seen crt's that were whacked at the back of the neck in the TV
>(accidentally), I have never seen the inside of the TV full of glass. Looks
>like they just degas. Maybe it matters where you whack em.
~From The Electronics Vaults of DrVideo ~
~ EMail Replies require the Removal of : "edyClub"
DrVideoRx
Writes:
>
>
>Interesting about the implosion. But I wonder how bad it really is. When I
>have seen crt's that were whacked at the back of the neck in the TV
>(accidentally), I have never seen the inside of the TV full of glass. Looks
>like they just degas. Maybe it matters where you whack em.
****As one who has literally broken 1,000's of CRT's over the years (for
disposal), I have had only one "major" incident, and that was with one of the
older 21" round color CRT's (they were not as stable or well made)....anyway it
exploded as I was removing the yoke and sent glass everywhere...I had about 15
minor cuts and scratches...but one major gash in my arm that almost severed the
vein....that was over 30 years ago..and needless to say I have had GREAT
respect for CRT's ever since....and no more cuts either !
Point is that since a CRT is under vacuum..the "Potential" is there for
explosion, and if this danger were not present...than the mfg (especially given
how (cheap) cost conscious they have become) certainly would not put an extra
implosion shield on the front of each tube.......so the best policy here is
better safe than sorry...
Sort of like saying...Gee...I didn't know it was loaded !
Clifton T. Sharp Jr.
> I've broken some too (I detect that at least part of your message is
> aimed at my earlier post). I've done the controlled "pop the neck off
> the CRT" trick (once, unfortunately, accidentally on a set I was
> repairing), and I saw one throw glass several feet in all directions
> after a group of us stoned it with fist-sized stones. If they aren't
> dangerous, why are there so many warnings? I've never seen a tiger eat
> a man before, but I believe that one will.
I did the neck-popping trick once at a very bad time. I was returning the
chassis of an old RCA color set; chassis had been a tough dog and was in
the shop for six months. I slid the chassis to the left to get at some
thing or another, the HV cage hit the neck and I heard this hissing sound
that told me I was going to have one hell of an angry customer on my hands.
--
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hammo...@my-deja.com
weeks. From previous inquiries, it has a [few] components that have gone
temperature sensitive and it shuts off. Hopefully, this will be a simple fix
and I'll eventually get the nerve to go inside.
I'm a little leary of tv repair, and since I've been stalling by working on
other components (and having success, by the way), I figure the longer it
sits, the better my chances of keeping the same hairdo. I'm not a tech, but
my troubleshooting skills are improving and pinpointing problems becomes
quicker with each project.
I've heard that older TVs can hold a charge for months. Is that true? I hope
mine doesn't fall into that category, but ya never know.
In article <SAM.99Oc...@colossus.stdavids.picker.com>,
s...@stdavids.picker.com (Sam Goldwasser) wrote:
> For modern TVs and monitors I agree - solid state rectifiers don't have
> infinite resistance so do bleed off the charge relatively quickly (but you
> still shouldn't assume!). However, in the good old days of tube type HV
> rectifiers, charge could hang around for quite some time.
>
> Remember, it isn't 'most' that matters. It's that singularity which may
> be the exception! :)
>
>
> I think the danger of HV on CRTs and microwave caps and CRTs imploding
> has been exagerated a little. I've never seen a TV or microwave hold a
> charge for more than a few days. I'm not saying it's impossible, but
> highly unlikely.
> Andy Cuffe
> balt...@psu.edu
>
--
Bobby Basham Tucson, Arizona
Hammond C-3, Leslie 122, PR-40
Baldwin 9ft Concert Artist Grand
Clavinova CLP-123
Sent via Deja.com http://www.deja.com/
Before you buy.
greg szekeres
>>From: BOB URZ so...@inetnebr.com
>
>Writes:
>
>>
>>
>>Interesting about the implosion. But I wonder how bad it really is. When I
>>have seen crt's that were whacked at the back of the neck in the TV
>>(accidentally), I have never seen the inside of the TV full of glass. Looks
>>like they just degas. Maybe it matters where you whack em.
>
>****As one who has literally broken 1,000's of CRT's over the years (for
>disposal), I have had only one "major" incident, and that was with one of the
>older 21" round color CRT's (they were not as stable or well made)....anyway it
I had heard the story of the neck imbedding itself into the wall back when I
was growing up, but has anybody actually been faced with glass
thrown across the room and embedding itself into hard material?
greg
Sam Goldwasser
high voltage rectifiers were still used!
Of course, it won't hurt to double check at the CRT as described in the
FAQ for discharging of CRTs. And, since the first time you power it up
to check something, it will recharge, you should be aware of how to
dischrage it safely.
--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://plop.phys.cwru.edu/repairfaq/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html
43OO2I6D0TC0M
> dangerous, why are there so many warnings?
Why are there warnings on laser pointers, toothpaste, soap, TV shows,
bicycles, toys, pillows, and most everything? Because of a society that
allows someone to sue a bar that sold them a drink when they hit someone
by driving drunk. If we would not allow stupid lawsuits, there would be
no such warnings on everything.
Well, now because some of you are not going to allow kids to learn about
electronics, they will have to do THAT behind your backs too. Good Job!
It is much more dangerous to censor your kids from learning and
experiencing things that YOU find offensive or dangerous. Especially
when you keep them stupid and shielded from everything until they are
18, and then throw them out of the house knowing nothing. Then all of a
sudden they have the permission to learn about sex and how to fix a TV.
43OO2I6D0TC0M
Of course. They are no different than anything else. One could eat
1000 Bananas and then choke on one and decide that no one should ever
eat Bananas again!
43OO2I6D0TC0M
> was growing up,
And the STORY about someone's dog with fingers in it's mouth and a
burglar hiding in the closet. Or the story about someone blowing-up a
cat in a microwave.
But they are just stories. None of them ever happened.
James Sweet
which is rather strong. The parts start by flying inward, so some of the
force is absorbed before pieces go flying.
greg szekeres wrote:
>
> In article <19991018131754...@ng-fc1.aol.com>, drvi...@aol.comedyClub (DrVideoRx) wrote:
> >>From: BOB URZ so...@inetnebr.com
> >
> >Writes:
> >
> >>
> >>
> >>Interesting about the implosion. But I wonder how bad it really is. When I
> >>have seen crt's that were whacked at the back of the neck in the TV
> >>(accidentally), I have never seen the inside of the TV full of glass. Looks
> >>like they just degas. Maybe it matters where you whack em.
> >
> >****As one who has literally broken 1,000's of CRT's over the years (for
> >disposal), I have had only one "major" incident, and that was with one of the
> >older 21" round color CRT's (they were not as stable or well made)....anyway it
>
> I had heard the story of the neck imbedding itself into the wall back when I
Asimov
Re: Advice Please: Should kids take apart electronic devices? (19 Oct 99
21:46:32)
43> And the STORY about someone's dog with fingers in it's mouth and a
43> burglar hiding in the closet. Or the story about someone blowing-up a
43> cat in a microwave.
43> But they are just stories. None of them ever happened.
I heard a couple of real stories on the news lately. One a case of a
schizoid mom who placed her baby instead of the baby bottle in the
micro-wave. Also just recently, a mom who placed an infant in its baby
seat on a lit electric range burnt to death while she hung up clothes
outside. Yes, cases like this happen, it's just that they're simply much
too depressing to publish. Heck they're depressing just telling it here.
... Bad Beer Rots Our Young Guts But Vodka Goes Well.
--
| Return Address: mike...@m-net.axess.com
| Standard disclaimer: The views of this user are strictly her/his own.
| From addresses mangled solely to block spamming.
| Apologies to those wishing to respond, change m-net to mnet.
RWatson767
> Advice Please: Should kids take apart electronic devices?
I have read some of the replies. Have you visited the classroom and teacher to
indicate your concerns and those of the 48 replies on this group?
Bob AZ
Ben allgor
"crack off" the necks of defective tubes as they came down the conveyor line
to be processed for reuse of the bulbs. I clamped a hot wire around the neck
near the base and then after it was hot either spit on the spot or wiped it
with a wet rag. This cracked the neck safely. I have never seen a tube
implode when the neck was broken near the base. I have seen tubes implode
though.
A 27 inch tube once blew a friend of mine about 10 feet. He was sealing off
the end of the neck on a hot tube (using a torch) when a cool draft hit the
tube.
We wore woven glass shirts, gloves and clear plastic face masks to prevent
injuries from the glass.
--
C. Ben Allgor, PE
Benjamin Engineering, PC
http://members.aol.com/bengineers
email: bena...@ieee.org
"Clifton T. Sharp Jr." <cli...@corecomm.net> wrote in message
news:380BBA56...@corecomm.net...
> Tom MacIntyre wrote:
> > I've broken some too (I detect that at least part of your message is
> > aimed at my earlier post). I've done the controlled "pop the neck off
> > the CRT" trick (once, unfortunately, accidentally on a set I was
> > repairing), and I saw one throw glass several feet in all directions
> > after a group of us stoned it with fist-sized stones. If they aren't