3 Sep
2008
3 Sep
'08
8:12 p.m.
Chuck Guzis wrote:
Because I don't want to hear 60Hz hum when I plug my headphones into the flip-flop
output. ;-) Seriously, you are absolutely correct that AC could be used for the filaments
in this case, but the PC power supply is being built for multiple uses and will just
happen to be there for these tube logic experiments. I planned to mod the PC power supply
well before coming up with this low voltage tube logic project (which may or may not
succeed). My goal is also to provide a commonly available, cheap and multi-use power
source for the tubes that could be duplicated by others if I succeed in this and decide to
put the tube logic project on a web page. Like me, rather than just building a supply
that would be used only with the tube project, they would be building a very cheap,
high-current DC power supply useful for other purposes.
Can't get
much cheaper than effectively free for a well regulated,
high current DC power supply using a modified PC power supply that
isn't otherwise being used. Plus, the idea of using tubes with 5V
filaments instead of 6.3/12.6V reduces the competition with typical
audio tube customers and makes the use of a high-current 5VDC
supply possible.
For digital circuits (I assume that's what we're
still discussing), why is a DC heater supply necessary? If you do decide to use a regulated DC supply with
overcurrent protection, keep in mind that cold heater inrush current
can be substantially greater than the nominal heater current
rating.
Right now, my goal is to build just an astable multivibrator clocking a 4-bit counter. To
show the alternating state of the multivibrator, I'll light the tube from below
through the hole in the center of the socket with a two-color LED and the states of the
counter tubes will be indicated by lighting them from below with a red or blue LED.
I've got the special effects visualized, but that's the really easy part.
3 Sep
3 Sep
8:21 p.m.
William Blair wrote:
Right now, my goal is to build just an astable
multivibrator clocking a 4-bit counter. To show the alternating state of the
multivibrator, I'll light the tube from below through the hole in the center of the
socket with a two-color LED and the states of the counter tubes will be indicated by
lighting them from below with a red or blue LED. I've got the special effects
visualized, but that's the really easy part.
Would not a green & red Ne-2 would fit the mood better.
If you have the HV why not go nixe tube?
8:30 p.m.
On Wednesday 03 September 2008 23:21, bfranchuk at jetnet.ab.ca wrote:
William Blair wrote:
Given 4-bit binary, how many more tubes do you think it'd take to do the
1-of-10 decoding?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Right now, my goal is to build just an astable
multivibrator clocking a
4-bit counter. To show the alternating state of the multivibrator, I'll
light the tube from below through the hole in the center of the socket
with a two-color LED and the states of the counter tubes will be
indicated by lighting them from below with a red or blue LED. I've got
the special effects visualized, but that's the really easy part.
Would not a green & red Ne-2 would fit the mood better.
If you have the HV why not go nixe tube?
8:40 p.m.
Roy J. Tellason wrote:
On Wednesday 03 September 2008 23:21, bfranchuk at
jetnet.ab.ca wrote:
I was thinking 4 tubes with "+ -" or 0/1.
William Blair wrote:
Given 4-bit binary, how many more tubes do you think it'd take to do the
Right now, my goal is to build just an astable
multivibrator clocking a
4-bit counter. To show the alternating state of the multivibrator, I'll
light the tube from below through the hole in the center of the socket
with a two-color LED and the states of the counter tubes will be
indicated by lighting them from below with a red or blue LED. I've got
the special effects visualized, but that's the really easy part.
Would not a green & red Ne-2 would fit the mood better.
If you have the HV why not go nixe tube?
1-of-10 decoding?
4 Sep
4 Sep
5:33 a.m.
From: bfranchuk at jetnet.ab.ca---snip---
> > Would not a green & red Ne-2 would fit the mood better.> If you have the
HV why not go nixe tube?>
There is no green Ne-2. You can put a filter on a NE-2
and
get a nice red or yellow but not green.
Dwight
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8:48 a.m.
dwight elvey wrote:
I picked a one with a green filter at Rat Shack a few years ago.
I guess blue or white LEDs are the fad now.
From:
bfranchuk at jetnet.ab.ca---snip---
>> Would not a green & red Ne-2 would fit the mood better.> If you have the
HV why not go nixe tube?>
>>
There is no green Ne-2. You can put a filter on a NE-2 and
get a nice red or yellow but not green.
8:54 a.m.
You wrote:
>>>> Would not a green & red Ne-2 would
fit the mood better.> If you
>>>> have the HV why not go nixe tube?>
> There is no green Ne-2. You can put a filter on a NE-2 and
> get a nice red or yellow but not green.
There's the NE-2G, which has some sort of white phosphor coating
on the inside of the tube envelope. Their light output is most
decidedly green.
I picked a one with a green filter at Rat Shack a few
years ago.
I guess blue or white LEDs are the fad now.
Was it what I described above? (just curious)
-Dave
--
Dave McGuire
Port Charlotte, FL
8:59 a.m.
There is no green Ne-2. You can put a filter on a NE-2
and
get a nice red or yellow but not green.
Well, you are technically correct, as "NE-2" was originally a standard
- the little orange glowing tube we all know and love, but there were
some makers that did make a green version. The inside of the glass
bulb was frosted with a green phosphor.
--
Will
5 Sep
5 Sep
6:37 a.m.
Date: Thu, 4 Sep 2008 11:59:04 -0400> From:
wdonzelli at gmail.com> To: cctalk at classiccmp.org> Subject: Re: vac tubes / was
Re: Schematics of Atanasoff-Berry> > > There is no green Ne-2. You can put a
filter on a NE-2 and> > get a nice red or yellow but not green.> > Well, you
are technically correct, as "NE-2" was originally a standard> - the little
orange glowing tube we all know and love, but there were> some makers that did make a
green version. The inside of the glass> bulb was frosted with a green phosphor.>
> --> Will
Hi
Yes, I've seen the phosphor ones but I think they may use
a different mixture of gas.
Using a diffraction grating or prism on a neon shows one yellow
and two red bands( as I recall ).
I suspect that the phosphor ones would have different
operating voltages.
Dwight
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2:12 p.m.
On 05/09/2008 14:37, dwight elvey wrote:
I don't think so, or at least not very different (I didn't actually
measure it). I've got a couple here, salvaged from flashguns that had
one red/orange neon and one green one. They look the same, except for
the band of phosphor at one end of the green ones, and ran off the same
voltage. The green ones aren't completely covered with phosphor inside,
and it's possible to see the usual orange glow when you look in the end
with the wires, too. I must go and find a diffraction grating -- I know
I've got one here somewhere...
--
Pete Peter Turnbull
Network Manager
University of York
Date: Thu, 4
Sep 2008 11:59:04 -0400> From: wdonzelli at gmail.com> To: cctalk at
classiccmp.org> Subject: Re: vac tubes / was Re: Schematics of Atanasoff-Berry> >
> There is no green Ne-2. You can put a filter on a NE-2 and> > get a nice red or
yellow but not green.> > Well, you are technically correct, as "NE-2" was
originally a standard> - the little orange glowing tube we all know and love, but there
were> some makers that did make a green version. The inside of the glass> bulb was
frosted with a green phosphor.> > --> Will
Hi
Yes, I've seen the phosphor ones but I think they may use
a different mixture of gas.
Using a diffraction grating or prism on a neon shows one yellow
and two red bands( as I recall ).
I suspect that the phosphor ones would have different
operating voltages. 
3 p.m.
On 5 Sep 2008 at 22:12, Pete Turnbull wrote:
I don't think so, or at least not very different
(I didn't actually
measure it). I've got a couple here, salvaged from flashguns that had
one red/orange neon and one green one. They look the same, except for
the band of phosphor at one end of the green ones, and ran off the same
voltage. The green ones aren't completely covered with phosphor inside,
and it's possible to see the usual orange glow when you look in the end
with the wires, too. I must go and find a diffraction grating -- I know
I've got one here somewhere...
Here's a chart from a manufacturer:
http://www.elevam.co.jp/elevam-hp-e/product-3.html
The specturm of neon:
http://astro.u-strasbg.fr/~koppen/discharge/neon.html
Apparently there's enough UV from the discharge to excite a phosphor.
These all seem to be close enough in ratings from color to color
(given the same size of lamp) to lead me to believe they all have the
tranditional Penning mixture of 99.5% neon and 0.5% argon.
Cheers,
Chuck
4 Sep
4 Sep
10:13 a.m.
On Thursday 04 September 2008 08:33, dwight elvey wrote:
There is a similar lamp, filled with Argon I think, but it's not called
NE-2.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
From:
bfranchuk at jetnet.ab.ca---snip---
> > Would not a green & red Ne-2 would fit the mood better.> If you have
> > the HV why not go nixe tube?>
There is no green Ne-2. You can put a filter on a NE-2 and
get a nice red or yellow but not green.
10:33 a.m.
On 4 Sep 2008 at 13:13, Roy J. Tellason wrote:
There is a similar lamp, filled with Argon I think,
but it's not called
NE-2.
Variations of the simple NE-2 come in a bewildering variety of sizes
and colors, including yellow and blue as well as green and white:
http://www.lamp-cn.com/english/list.asp?classid=3
Cheers,
Chuck
noon
> >
Would not a green & red Ne-2 would fit the mood better.> If you have =
the
HV why not go nixe tube?>=20
There is no green Ne-2. You can put a filter on a NE-2 and
get a nice red or yellow but not green.
1:09 p.m.
On Sep 4, 2008, at 3:00 PM, Tony Duell wrote:
Maybe not strictly an NE2, but there are green and
blue neons
avaiable.
They have a phosphor coating on the inside of the glass, and I _think_
the gas inside is still neon (I see to remember seeing the classic
orange
glow trhough the glass around the leadout wires).
Oooh, I've never seen a blue one. The green ones were even
available from Radio Shack on this side of the pond, but never the
blue ones, as far as I can recall.
-Dave
--
Dave McGuire
Port Charlotte, FL
5 Sep
5 Sep
1:11 p.m.
On Sep 4, 2008, at 3:00 PM, Tony Duell wrote:
I think the blue ones are relatively recent, probably to go alongside
blue LEDs (which seem to be used on everything thse days).
I don;t think I've seen loose blue neon bulbs for sale. I've certainly
seen blue neon mains indicator assemblies, though, and they don't appear
to be either a plain bulb or a green one filtererd.
-tony
Maybe not strictly an NE2, but there are green
and blue neons
avaiable.
They have a phosphor coating on the inside of the glass, and I _think_
the gas inside is still neon (I see to remember seeing the classic
orange
glow trhough the glass around the leadout wires).
Oooh, I've never seen a blue one. The green ones were even
available from Radio Shack on this side of the pond, but never the
blue ones, as far as I can recall.
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