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Home > Archive > Electrical Engineering > June 2006 > electron gun
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| bob@coolgroups.com 2006-06-03, 8:21 pm |
| Why doesn't an electron gun in a CRT tube run out of electrons?
| |
| Salmon Egg 2006-06-03, 10:21 pm |
| On 6/3/06 3:54 PM, in article
1149375242.516448.24170@i40g2000cwc.googlegroups.com, "bob@coolgroups.com"
<bob@coolgroups.com> wrote:
> Why doesn't an electron gun in a CRT tube run out of electrons?
>
The electrons get reused. The shoot out of the gun accelerated by a high
positive potential circa kilovolts. Ultimately they slow down and wander
back to the negative side of the accelerating power supply which is near
zero potential.
Bill
-- Ferme le Bush
| |
| TimPerry 2006-06-03, 11:21 pm |
| bob@coolgroups.com wrote:
> Why doesn't an electron gun in a CRT tube run out of electrons?
i worry about more important issues like: why were there no rainbows before
the great flood?
| |
| JohnR66 2006-06-04, 12:21 am |
| The little electron fairy goes to the ammo store and buys a case of full
metal jacket electrons, brings 'em back, loads up the clip and slaps it back
into the electron gun.
<bob@coolgroups.com> wrote in message
news:1149375242.516448.24170@i40g2000cwc.googlegroups.com...
> Why doesn't an electron gun in a CRT tube run out of electrons?
>
| |
| fabbl 2006-06-04, 12:21 am |
| conservation of charge, but I like the fairy explaination better!
<bob@coolgroups.com> wrote in message
news:1149375242.516448.24170@i40g2000cwc.googlegroups.com...
> Why doesn't an electron gun in a CRT tube run out of electrons?
>
| |
| **THE-RFI-EMI-GUY** 2006-06-04, 3:21 am |
| I got one, why did the electron cross the grid?
fabbl wrote:
>conservation of charge, but I like the fairy explaination better!
>
><bob@coolgroups.com> wrote in message
>news:1149375242.516448.24170@i40g2000cwc.googlegroups.com...
>
>
>
>
>
>
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
| |
| Salmon Egg 2006-06-04, 2:21 pm |
| On 6/3/06 7:05 PM, in article GM-dndzT5_Z3oh_ZRVn-vg@adelphia.com,
"TimPerry" <timperry@noaspamadelphia.net> wrote:
> i worry about more important issues like: why were there no rainbows before
> the great flood?
How do you know?
Bill
-- Ferme le Bush
| |
| TimPerry 2006-06-04, 10:21 pm |
| Salmon Egg wrote:
> On 6/3/06 7:05 PM, in article GM-dndzT5_Z3oh_ZRVn-vg@adelphia.com,
> "TimPerry" <timperry@noaspamadelphia.net> wrote:
>
>
> How do you know?
>
> Bill
i read it on the internet! 
http://sunnyokanagan.com/joshua/flood.html
| |
| thrugoodmarshall@hotmail.com 2006-06-05, 2:21 pm |
| Electrons are made of dark.
The electron gun is pointed at the screen of the CRT, which is actually
a modified darksucker capable of displaying images.
When you turn off the CRT, the dark is recycled back from the screen to
the gun.
You'll notice on old CRTs that never get turned off that you can see
the image on the CRT even if you do eventually turn it off. This is
because the dark is stuck and can't get back to the electron gun.
It takes a while for the dark to get back to the gun. Less effecient
crts will show a small bright dot in the center after they're turned
off, before all the dark is recycled.
The newer CRTs have a special accelerated-dark-recycling (ADR) circuit
built in, and you usually don't see that bright dot. This is how they
are qualified for the energystar rating. You will never see a
legitimate energy star rating on a crt that shows this small dot
shortly after being turned off. If you do, that means that either the
ADR circuit has failed or the energystar logo on the CRT is a fake.
LCD and TFT monitors work exactly the same way, except the darksucker
is much flatter. You can turn a regular CRT into a Flat screen CRT by
heating it to just enough to soften and laying the front on a flat
surface such as a desk or floor. This, however, is very dangerous, as
CRTs are typically filled with a high pressure vacuum. This vacuum can
cause the CRT to implode, and the vacuum will escape. However, since
glass is a liquid, you could just set the CRT down on its face at room
temperature and wait. Soon you will have a flat monitor for the price
of a tube.
bob@coolgroups.com wrote:
> Why doesn't an electron gun in a CRT tube run out of electrons?
| |
| Skenny 2006-06-05, 3:21 pm |
| You guys almost have it, but the real reason is that the electrons are
supplied by tv stations and websites. There is a top secret super minature
flexiable not corroding ansi approved fibre glass optic nerve thing-a-ma-jig
that runs inside the power cable and connects to an identical but different
thing-a-ma-jiggy in the wall outlet.
This has been going on ever since before the war. (The big one). It is still
top secret stuff, just in case another cold war breaks out.
This is also why tv stations charge for their services. Where you dont have
cable tv, the electrons arrive in the form of disquised air molecules.
How do I know this highly classified stuff?
Well, I invented it. I also won a nobel peace prize for it. It was in all
the papers, then this guy name of Albert something came up with the idea of
time travel. He traveled back in time and entered his idea before I could
mine, thusly beating me to the coveted nobel prize. So all mention of me
getting it was wiped away.
But alas, I still have the nobel prize plaque hanging on my wall right up
there...
DOH!!! It's gone! That dogone Albert, he mustve time traveled into the
future, read this post, then back time traveled and stole the plaque off my
wall while I was out getting diet pepsi!!!
One of these days!!!
<thrugoodmarshall@hotmail.com> wrote in message
news:1149525683.229156.153140@i39g2000cwa.googlegroups.com...
> Electrons are made of dark.
> The electron gun is pointed at the screen of the CRT, which is actually
> a modified darksucker capable of displaying images.
> When you turn off the CRT, the dark is recycled back from the screen to
> the gun.
>
> You'll notice on old CRTs that never get turned off that you can see
> the image on the CRT even if you do eventually turn it off. This is
> because the dark is stuck and can't get back to the electron gun.
> It takes a while for the dark to get back to the gun. Less effecient
> crts will show a small bright dot in the center after they're turned
> off, before all the dark is recycled.
>
> The newer CRTs have a special accelerated-dark-recycling (ADR) circuit
> built in, and you usually don't see that bright dot. This is how they
> are qualified for the energystar rating. You will never see a
> legitimate energy star rating on a crt that shows this small dot
> shortly after being turned off. If you do, that means that either the
> ADR circuit has failed or the energystar logo on the CRT is a fake.
>
> LCD and TFT monitors work exactly the same way, except the darksucker
> is much flatter. You can turn a regular CRT into a Flat screen CRT by
> heating it to just enough to soften and laying the front on a flat
> surface such as a desk or floor. This, however, is very dangerous, as
> CRTs are typically filled with a high pressure vacuum. This vacuum can
> cause the CRT to implode, and the vacuum will escape. However, since
> glass is a liquid, you could just set the CRT down on its face at room
> temperature and wait. Soon you will have a flat monitor for the price
> of a tube.
>
> bob@coolgroups.com wrote:
>
----== Posted via droptable.com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.droptable.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----
| |
| Bob Weiss 2006-06-08, 10:21 pm |
| bob@coolgroups.com wrote:
> Why doesn't an electron gun in a CRT tube run out of electrons?
>
In a sense, they do, but it takes a long time.
The electrons are emitted from a part of the gun called the cathode,
which is a nickel sleeve coated with various metal oxides. After many
thousands of hours of service, this oxide layer starts to lose its
ability to emit electrons, and this loss of emission causes a dim,
poorly focused image on the screen.
Most modern TVs or monitors end up in landfills for other reasons well
before the CRT gets worn out, though.
Bob Weiss N2IXK
| |
| Salmon Egg 2006-06-09, 3:21 pm |
| On 6/8/06 6:08 PM, in article 4S3ig.8649$PY6.3381@trnddc05, "Bob Weiss"
<bob.weiss@verizon.net> wrote:
> bob@coolgroups.com wrote:
>
> In a sense, they do, but it takes a long time.
>
> The electrons are emitted from a part of the gun called the cathode,
> which is a nickel sleeve coated with various metal oxides. After many
> thousands of hours of service, this oxide layer starts to lose its
> ability to emit electrons, and this loss of emission causes a dim,
> poorly focused image on the screen.
>
> Most modern TVs or monitors end up in landfills for other reasons well
> before the CRT gets worn out, though.
>
> Bob Weiss N2IXK
Sounds like an application for Viagra.
Bill
-- Ferme le Bush
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