On Tuesday, February 4, 2003, chu(a)verizon.net wrote:
> I just bought a PDP 11/73, but unfortunately UPS dropped it on the way.
My suggestion would be to attempt an insurance claim. All UPS shipments are
insured for at least $100 automatically. Hopefully you had more on this...
--
Jeffrey Sharp
I'm looking at building a personal lighting project possibly using white
LEDs instead of regular miniature bulbs, and as I browsed the Mouser
catalog, I got a whole lot more confused than less...
I'm trying to get the maximum amount of light for current expended, and the
numbers seem to be nonstandard, or at least not enough info is provided... :-/
Example:
P. 217, "Super Flux LED Lamps"
The white one shows at 20mA it will put out 400-600 "Iv (mcd)"
P. 216, "Blue & White LED Lamps"
The brightest white they have is listed as: "2200->3200
"Luminous Intensity" but with no mention of current or value
(mcd? ucd? )
P. 199, "Thru-Hole White LED Lamps"
"Luminous Intensity" ? current would output 1.7->2.3->2.6
(min/typical/max) mcd...
and on P. 206, there's a few colored LEDs output listed as "Foot Lamberts"...
And Digi-Key has these Surface Mount Incandescent Lamps... :-O The look
cool, but how hot do they get? (It's a very small installation area... It's
still an idea I'm forming, but if it works out, it's a *kewl* idea...)
Any good websites w/info on how to figure out how many LEDs I'd need to
make about a 40W (or more) lightbulb worth of light?
-- Also, my college electronics braincells are rather weak, as I can't
remember if the wattage rating means "total dissapated wattage" or "total
wattage of the circuit branch it's in"... [1]
... I'm getting too old for this ...
Any help/pointers would be *massively cool*...
Thanks!
"Merch"
[1] - I want to use SMT current limiting resistors [2] (fewer holes to
drill...) and the highest wattage ratings I can find is 1/8W... in a 6V
20mA circuit it's running real close... (I could run ~17mA to get a margin
of error... but I want the max light I can get...) RatShaq has 1.2A 6V
wall-warts for a reasonable $, and I wanna build a "different" light
fixture. Of course, I want a *usable* light fixture... ;-)
[2] - I wish I could find SMT white LEDs... :-/
--
Roger "Merch" Merchberger -- sysadmin, Iceberg Computers
zmerch(a)30below.com
What do you do when Life gives you lemons,
and you don't *like* lemonade?????????????
All,
Thanks all for the info. Basically, there's a whole myriad of
cards and monitors for DEC systems, and there's no single tube
that works with them all.
Solution (for me, ymmv) was to get a (cheap! :) multisync monitor
with BNC connectors and sync-on-green capability - I was able to
get a used Iiyama MF8117T (known to US people as IDEK MF8117T)
17" tube. Works like a charm, rock-solid picture on all systems
I could set up for testing. Neat!
I am typing this in a window on that thing, connected to the
VXT2000+ X Terminal, which in turn is connected to my OpenBSD
VAX (4100). Yay!
--fred
At 12:36 AM 2/4/03 -0800, you wrote:
>> Does anyone remember what was required to convert an IBM Selectric
>> Typewriter to a computer printer? I seem to recall a kit of some sort
>> was available, but my memory is
>> *really* hazy about that.
>
Speaking of interfacing Selectrics. I was talking to my father about Teletypes the other day and he told me that he had thrown out an old "word processor" (my term not his). He said that it was a desk sized mechanical unit that had a keyboard and mechanical printer along with a paper tape punch/reader. He said that you could type in a letter and insert a pause any place where you wanted to insert unique data such as a name. The unit would save everything on punched paper tape. You could then feed the PT back into and it would type the letter. When it got to the pause it would stop and let you manually type in the name or other data and then it would continue and finish the letter. Does anyone know what these thing was? I think he must have gotten this after I left home because I don't remember ever seeing it. Unfortunately he threw it away several years ago.
Joe
On Feb 4, 12:49, Jay West wrote:
> That being said - this has come up for discussion several times in
the past,
> and pretty much the majority of people said don't put it in so I left
it
> out. However, if the majority opinion has changed, I'd be happy to
add it
> back. Tis up to you folks! :)
My vote is to leave it as it is, ie no tag, please.
I dislike the wasted space in the subject line (and yes I can make it
wider but I choose not to do so because it suits everything else the
way it is, thanks), and there are plenty of other things in the headers
I can filter on. Besides, once a thread has started I can recognise
the subject lines; I don't need tags.
FWIW, I'm on several other lists, either at home or at work, only a few
of which use tags -- and all of those have at some time exhibited the
recursion problem, apparently because some MUAs munge the subject lines
when replying.
--
Pete Peter Turnbull
Network Manager
University of York
>From: "Roger Merchberger" <zmerch(a)30below.com>
>
>I'm looking at building a personal lighting project possibly using white
>LEDs instead of regular miniature bulbs, and as I browsed the Mouser
>catalog, I got a whole lot more confused than less...
>
>I'm trying to get the maximum amount of light for current expended, and the
>numbers seem to be nonstandard, or at least not enough info is provided... :-/
>
>Example:
>
>P. 217, "Super Flux LED Lamps"
> The white one shows at 20mA it will put out 400-600 "Iv (mcd)"
>P. 216, "Blue & White LED Lamps"
> The brightest white they have is listed as: "2200->3200
> "Luminous Intensity" but with no mention of current or value
> (mcd? ucd? )
Hi
I'm not sure what "Luminous Intensity" means but mcd means
milli-candles and ucd means micro-candles.
>P. 199, "Thru-Hole White LED Lamps"
> "Luminous Intensity" ? current would output 1.7->2.3->2.6
> (min/typical/max) mcd...
>
>
>and on P. 206, there's a few colored LEDs output listed as "Foot Lamberts"...
>
>And Digi-Key has these Surface Mount Incandescent Lamps... :-O The look
>cool, but how hot do they get? (It's a very small installation area... It's
>still an idea I'm forming, but if it works out, it's a *kewl* idea...)
>
>Any good websites w/info on how to figure out how many LEDs I'd need to
>make about a 40W (or more) lightbulb worth of light?
This is not so easy to figure. You need to know how efficient
the LED's are, relative to standard bulbs. It seems like I saw
something that said that LEDs were not quite as efficient as
fluorescent lamps but still better than incandescents. If we figured
them at twice as efficient, you'd need 20W's of LEDs. Watts is
just the current times the voltage. You figure this for each LED
and add them all together. LEDs do require a circuit to limit
the current. When you figure your total light output, you don't
count the loss in the control circuit. Of course, for the final
tally, you'll need to include this as well.
When driving a number of LED's, it is better to drive a large
number in series because you only need one current limiting
circuit. The count of LED's would depend on the voltage source
you have available. You'd have the total LED voltage plus
the drop needed across your current limiting cicuit.
Dwight
>
>-- Also, my college electronics braincells are rather weak, as I can't
>remember if the wattage rating means "total dissapated wattage" or "total
>wattage of the circuit branch it's in"... [1]
>
>... I'm getting too old for this ...
>
>Any help/pointers would be *massively cool*...
>
>Thanks!
>"Merch"
>
>[1] - I want to use SMT current limiting resistors [2] (fewer holes to
>drill...) and the highest wattage ratings I can find is 1/8W... in a 6V
>20mA circuit it's running real close... (I could run ~17mA to get a margin
>of error... but I want the max light I can get...) RatShaq has 1.2A 6V
>wall-warts for a reasonable $, and I wanna build a "different" light
>fixture. Of course, I want a *usable* light fixture... ;-)
>
>[2] - I wish I could find SMT white LEDs... :-/
>
>--
>Roger "Merch" Merchberger -- sysadmin, Iceberg Computers
>zmerch(a)30below.com
>
>What do you do when Life gives you lemons,
>and you don't *like* lemonade?????????????
Well,
Intergraph still makes computers, they're just PCs.. But you guys missed
Concurrent, the descendant of Interdata and Perkin-Elmer, who specializes in
Video On Demand solutions.. they also bought Harris's computer division, for
the nighthawk. I think MODCOMP is still around in some form also..
Will J
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> I just bought a PDP 11/73, but
> unfortunately UPS dropped it
> on the way. So I am trying to
> what ever documentation and
> diagnostics that I can locate
> to figure out how badly it was
> damaged.
> The mounts for the tape drive and
> disk drive were broken as well as
> all of the external plastic.
Jeez, man, that REALLY sucks. My sympathies, and I hope that some of the
DECsters here on the list can help you revive the beast. Please keep us
posted.
Glen
0/0
Case dismissed, I'll drop the subject (without tags, even) now
that I am getting personal attacks about it.
I'll just unsubscribe, that will get rid of the OT banter as well.
--fred
