HDTenEightyP/NetNews huggingface dataset:
From: weverka@spot.Colorado.EDU (Robert T. Weverka)
Subject: Optically scanned TV (was Re: Blue Lasers)
Organization: University of Colorado, Boulder
Date: Tue, 28 Jul 1992 12:30:09 GMT

In article <1myx_6m@rpi.edu> ncc1701@acm.rpi.edu writes:
>tmkk@uiuc.edu (Khan) writes:
>
>>I heard a brief tidbit in one of the popular media about (IBM?)
>>inventing a blue laser, making extremely high resolution laser
>>projection TVs possible by using a red, a green, and a blue laser in
>>combination. Ultra high res, no visible pixels, etc. etc. Sounds like a
>>videophile's dream come true. Anyone know any more about this new
>>development? Will it make LCD light valve projectors obsolete before
>>they even get to market en masse?
>
The Argon Ion laser is often used for blue.  One watt of optical power
for onley $20,000.

>Hmm...I doubt it.  A couple of friends and I built a laser-sourced
>projection TV in college (red only) and had tremendous problems in
>controlling flicker.  We could get rid of it, but only at the
>expense of a jittery picture and almost NO brightness, or lotsa
>brightness, stable picture, and LOTS of flicker.
>I doubt lasers will be a viable alternative until there is some method
>of building very fast scanning apparatus and make them fail-safe as
>well.  (You'd need powerful lasers for decent brightness in a 
>naturally lit room, and if your scanning device fails, you're
>liable to burn a hole in the wall or someone's eyes...)
>
Research in optically scanned TV dates back some 40 years.
-before the laser.  There was a lot of renewed interest with the
invention of the laser.  Fast scanning was done with acoustooptics.

The difficulty is the optical power needed is about 50 watts.
That doesn't come cheap for a laser.
-ted

Newsgroups: sci.electronics
From: hsk@microplex.com (Harjeet Kalsi)
Subject: How do LCD Color TV's Work?
Organization: Microplex Systems Ltd.
Date: Tue, 28 Jul 1992 21:41:11 GMT


Hi, 

I'm fairly new to this newsgroup, so I apologize if this has been discussed 
before.

But exactly how to LCD color TVs work?  I'm somewhat familiar with the general 
operation of conventional TVs, and have always wondered how the "color" is 
generated in a LCD TV?

Also, when will we be seeing large LCD color TVs on the market?  Are they
destined to replace the conventional TV?
How do cost and picture resolution compare? I assume things like weight, 
cabinet size and picture distortion would be greatly reduced?

Thank you so much in advance for your responses.



*******************
*hsk@microplex.com*
*******************
Newsgroups: sci.electronics
From: nahabed@ntmtv.UUCP (Roupen Nahabedian)
Subject: JEDEC Standards
Originator: nahabed@nmtvs296
Reply-To: nahabed@ntmtv.UUCP (Roupen Nahabedian)
Organization: Northern Telecom Inc, Mountain View, CA
Date: Tue, 21 Jul 1992 21:01:22 GMT

Looking for information on JEDEC Standards (for power 
semiconductors)...What's covered and how can I get a
copy?

Thanks in advance,
--------------------------------------------------------------
UUCP:    ames!ntmtv!nahabed               | <><><><><><><><><>
         nahabed@ntmtv.UUCP               | <>()()()()()()()<>
ATTMAIL: monasa@attmail.com               | <>()()()()()()()<>
ARPANET: ntmtv!nahabed@ames.arc.nasa.gov  | <><><><><><><><><>
______________________________________________________________
Newsgroups: sci.electronics
From: klopfens@andy.bgsu.edu (Bruce Klopfenstein)
Subject: Future TV Remotes
Keywords: tv remote
Organization: Bowling Green State University B.G., Oh.
Date: Sat, 25 Jul 1992 13:15:05 GMT


I am trying to research the future of remote control technology
(i.e., TV remotes).  I know that AT&T among others are developing
new remotes that will be simpler in terms of number of buttons
but more complex in terms of functions.  Another development is 
small, palm-sized remotes intended for use with TV sets in the
bedroom.

Can anyone offer additional details on what the remote control
of the future will look like based upon actual research and
development projects now underway?  I'll be happy to summarize
the results of messages emailed to me if there is interest.

Thanks very much.


Bruce C. Klopfenstein             |  klopfens@andy.bgsu.edu
Department of Telecommunications  |  klopfenstein@bgsuopie.bitnet
322 West Hall                     |  klopfens@bgsuvax.UUCP
Bowling Green State University    |  (419) 372-2138; 372-2224 
Bowling Green, OH  43403-0235     |  fax (419) 372-8600
-- 

Bruce C. Klopfenstein             |  klopfens@andy.bgsu.edu
Department of Telecommunications  |  klopfenstein@bgsuopie.bitnet
322 West Hall                     |  klopfens@bgsuvax.UUCP
From: F.Farzin-nia@lut.ac.uk (F Farzin_nia)
Newsgroups: sci.electronics
Subject: Mystery Gadget
Date: 22 Jul 92 10:41:10 GMT
Reply-To: F.Farzin-nia@lut.ac.uk (F Farzin_nia)
Organization: Loughborough University, UK.

Dear All,

I have a 'I don't know what this piece of kit is' question :-) A friend of
mine recently bought a piece of kit from an electronic junk shop for me,
thinking that it was a telephone answering machine (you see, I had asked a lot
of friends to keep an eye out for a second
hand answering machine and if they were to find a reasonable one to
purchase it on my behalf). On close inspection of this rather curious
and wonderful gadget, I realised there is a lot more to it than meets
the eye. However, I simply cannot figure out what it is. This thing is
manufactured by LANIER BUSINESS PRODUCTS, INC (Atlanta, Georgia, USA),
and it has a MODEL P-101 printed underneath it. It resembles a telephone
answering machine/dictating machine/modem. It has a speaker but no
mic. There is a small tape recorder with the associated buttons plus a
'telephone' push button on the console. The other switches and buttons
on this machine which are located around and underneath it are:
DIC-CONF; OFF-SCAN; MIC-SPK; RECALL-1.2.3; A headset jack socket; a
record gain knob; telephone jack socket; a TOTAL and a RESET button;
three knobs that control SPEED (presumably that of the recorder), TONE
and VOLUME; and finally a SCART like socket. Incidentally, there are
some 7-segment led displays on the console to show 'unit no.', 'complete
units', 'instruction' and 'location' for DICTATE option and 'unit no.',
'total units', 'remaninig length' and 'instruction' for the TRANSCRIBE 
option.

If any of you  have ever come across a gadget like the above
please let me know what it is (and how it operates, if possible!).


Regards,
-Farzin.

P.S. Sorry for the long winded article. I am only trying to give as much
information as possible.


/--------------------------------/
/E-mail: F.Farzin-nia@lut.ac.uk  /
/--------------------------------/
/"Mankind Will Occasionally      /
/ Stumble Over The Truth, But    /
/ Usually He Will Pick Himself   /
/ Up And Continue On."           /
/                  W. Churchill  /
/--------------------------------/
Xref: sparky sci.electronics:13366 rec.video:9612
From: philip@vogon.cetia.fr (Philip Peake)
Newsgroups: sci.electronics,rec.video
Subject: Re: VCR Repairman Problem
Date: 27 Jul 92 13:25:06 GMT
Reply-To: philip@vogon.cetia.fr (Philip Peake)
Organization: CETIA, France

In article <1682D90F8.JWEST@r3vm.dsd.trw.com>, JWEST@r3vm.dsd.trw.com (Judson West) writes:
|> In article <1992Jul22.213329.28979@cs.mun.ca>
|> roger@odie.cs.mun.ca (Roger White) writes:
|>  
|> >I own an RCA VCR model # VMT295, this is a stereo VCR. We sent it in for
|> >repairs around a 1.5 months ago 
|> >(Tape wouldn't eject, turn on VCR immediately turns off by itself).

 1)  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

|> >We recieved it back and noticed a "little" problem,
|> >the first tape we played had a snowy screen. This problem rectified itself
|> >after 10 minutes through... we thought nothing of it.
|> >
|> >A few days later we noticed it again, this time it stayed snowy longer...
|> >we phoned the VCR clinic, they said dirty heads; bring it in whenever you
|> >can for a free cleaning. The problem went away again so we forgot about
|> >getting the heads cleaned.
|> >
|> >The third time this happened we phoned him again, they said dirty heads...
|> >we brought the machine down and they cleaned the heads but the problem wasn't
|> >fixed. They could temporarily fix it by touching an IC so they concluded the IC
|> >was at fault and they would repair it (Free of charge since their original

2)                                         ^^^^^^^^^^^^^^

|> >work had a 6 month guarantee).


|> My feeling is that you brought it in for a "snowy" problem. Their solution
|> was to clean the heads. This did not fix the original problem. They either
|> owe you:
|>  
|>    1) a refund on the original fix, or
|>    2) a credit towards the "real" fix, or
|>    3) the "real" fix at no charge.

Original problem was nothing to do with snowy picture (see 1).

There is nothing to credit on a free fix (see 2).

How about READING before posting ?

Philip
Newsgroups: sci.electronics
From: mikek@iex.UUCP (Mike Keilhofer)
Subject: Looking for Cassette Test Tape
Organization: IEX Corporation
Distribution: usa
Date: Tue, 28 Jul 1992 21:24:05 GMT

Does anyone know where I can buy a Cassette test and
alignment tape? I had heard that Abex Labs sold these
but have found their number out of service.

Michael K.

==================================================
Michael Keilhofer          
IEX Corporation           
Email: [uunet!]iex!mikek or mikek@iex.com
==================================================

Xref: sparky sci.electronics:13386 rec.audio:10874 alt.folklore.computers:11214
From: shoppa@erin.caltech.edu (TIM SHOPPA)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 27 Jul 92 17:44:00 GMT
Organization: California Institute of Technology
News-Software: VAX/VMS VNEWS 1.41

In article <1992Jul27.092328.21478@discus.technion.ac.il>, sorin@techunix.technion.ac.il (Goldenberg Sorin) writes...
>Somehow the cd manufacturers seem to squeeze more music into the c.d.
>I have Mahler 2.nd with Klemperer - above 79 min.
> 
	I am far from an expert on CD formats and technology, but it seems to
me that the CD manufacturer could lengthen the format the same way that an
LP manufacturer did - by allowing less space between the spirals (a.k.a.
"grooves").  CD's are not recorded in tracks and sectors as are floppies, but
in a spiral.  This allows the head-positioning algorithm to smoothly track
along as music plays, instead of having to jump from track to track and
simultaneously trying to ensure that enough music was stored in the buffer to
continuously play as the head settles on the new track.  There is probably a
"standard groove spacing" for CD's, otherwise they would do the same thing
that LP and 45 manufacturers did: vary the groove spacing for each and every
record to utilize most of the surface.  It would seem from the testimonials
on the net that CD's can go longer than the "standard", thus there must be
enough tolerance in most CD players to allow them to use narrower-than-
normal track spacing.
	I remember from articles in Radio-Electronics etc. when CD's were new,
some mention of the spiral-tracking technology, something about guard tracks
on the outside of the data that helped keep the servos locked on as the music
played.
	Also, I believe the same article pointed out that music *could* be
recorded on both sides!  Has anyone actually seen this done?  It would mean
that program information (and the trendy art designs) we are used to would
be non-existent or in the very center circle of the CD.

	I'm still waiting for the White Album on a single CD!  Buying something
on multiple CD's that could be put onto just one reminds me of Peter Schickele's
PDQ Bach routine, where the radio station WOOF is offering a prize of
Wagner's entire Ring cycle on "convenient" 45's, to be mailed one a week...

					Tim (Shoppa@erin.caltech.edu)
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Tue, 28 Jul 1992 19:11:34 GMT
Subject: Re: Help with transtators needed
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

>   Probably you'll need to fab your own; this isn't supposed to be
> too hard. Take a look at the Star Fleet Technical Reference, Supplement
> 3A-0005 "Fabrication of Common Transtators In The Field". Fascinating
> explanation of the reverse-flux-time process involved. The only risk
> is that a minor error at one particular step can result in a massive
> "bump" in the space-time fabric, but I didn't have any problems with
> this at all. If you've successfully built a dilithium power generating
> unit before (and who hasn't?), you'll have no trouble whatsoever.
> 

Good comments, Dana, but you're a little behind in your reading.  Appendix
A of the 3.02 revision of 3A-0005 (now available from FleetTechPubHQ-Earth,
or contact your Recreation, Entertainment, and Small Claims Court Officer)
SPECIFICALLY FORBIDS the reverse-time-flux technique for field transtator
fab, due to a recent unfortunate incident involving impact of a DeLorean of
unknown origin with the outer-hull, starboard side heat sinks from the
secondary hull waste recycler aboard the U.S.S. _Douglas_Adams_ during a
refit in High San Francisco Spacedock.  Persons who must due a field fab, as
opposed to waiting the twelve years for an internal req to clear the Fleet
Quartermaster's office, must now use the "bistable warp field" technique,
which works just as well and has only the minor drawback of resulting in
devices which smell strongly of garlic during normal use.  On the other hand,
no Fleet personnel have been attacked by vampires when using equipment 
incorporating such devices, proving the old Klingon proverb that "every
dark cloud has an even darker, and hopefully very rocky and nasty, lining."

By the way, I have (of course) built many dilithium power units, but one recent
minor slip-up resulted in an embarrassingly large crater where the town of
Dead Cow, Wyoming used to be.  Has anyone else had bad luck with this recent
batch of Ferengi interlocks?


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
From: jsm@phoenix.Princeton.EDU (John Scott McCauley Jr.)
Newsgroups: sci.electronics
Subject: software for the 8051
Date: 27 Jul 92 21:46:23 GMT
Organization: Princeton University
Originator: news@ernie.Princeton.EDU

I'm looking for software to program a DS5000 (8051 + 32k ram on a chip).
I thought I could use eforth51, but doesn't look too promising....

Things I already have found:

	1) as31 - 8031/8051 xasm  posted to 'comp.sources.misc/volume10'

	2) eforth51 from the RealTime Control and Forth Board (RCFB) --
	     see comp.lang.forth for details. Need to merge data and code
	     space and hence won't run (w/o much hacking) on a DS5000.

Anybody know of other PD or Commerical software? 

	Thanks,

		Scott
Newsgroups: sci.electronics
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Subject: Re: Airport X-Rays
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Date: Tue, 28 Jul 92 02:01:40 GMT

Others said
# X-rays will wipe out unexposed and unprocessed film. 

I'm sort of wondering about this.....

You see, I, on occasion, need to xray things mechanical. While
I've had a good safety program, and I understand the physics, I don't
know a lot about the film characterics. I just use it, you see.

Anyhow, I was using a Golden Inspector, a nice cold-cathode box.  It
pulses. You typically clamp the 8x10" Poloroid X-ray film into a holder
that has a piece of phosphorescent material.  It glows when struck,
exposing the film.  Then you process the film and look at the results.

Anyhow, I was in a situation where I could not fit the plate holder
where needed. So, like a chump, I just used the film, and ran the
exposure up from 30 pulses to 100.
Nothing.
500 pulses
Nothing.
999
Nothing.
999, 3 times (the maximum for the Inspector until a 15 min  cooldown)
Not..a...thing....

So how sensitive IS film to X-rays, anyhow?

--
A host is a host from coast to coast..wb8foz@skybridge.scl.cwru.edu
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
Newsgroups: sci.electronics
From: cubanski@tensor4.WPI.EDU (David J Cubanski)
Subject: Dolby B/C? (A??)
Organization: Worcester Polytechnic Institute
Date: Wed, 22 Jul 1992 13:06:39 GMT

Here is a question for you netfolk.  I'm not sure if this is the right
group to ask this in, but I can't seem to find a better one, so here
goes.  

What, exactly, is the difference between the Dolby B and the Dolby C
settings on my tape deck?  What ever happened to Dolby A, if indeed
there ever was such a thing?  And how, exactly, does dolby work,
anyways?  From my observations of its performance, it seems to be some
kind of adaptive filtering scheme, but I would like to have a
specific, in-depth, engineering-type explanation.

PS - I hope this doesn't start some kind of holy war thread....

Thanks, 

-- 
-------------------------------
David Cubanski

Electrical Engineering Dept.
Worcester Polytechnic Institute
Worcester, MA  01609

cubanski@wpi.wpi.edu
-------------------------------
Newsgroups: sci.electronics,alt.folklore.urban
From: billn@hpcvaac.cv.hp.com (bill nelson)
Subject: Re: SHOCKING STORIES
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
Date: Fri, 31 Jul 1992 19:19:04 GMT

dogbowl@dogbox.acme.gen.nz (dogbowl) writes:
: > 
: > I still have the burn scars on my right had from shorting out the HV leads
: > of a tv transformer. It is also the worst shock I ever received.
: > 
: 
: a co=worker at a shortwave transitting station I was working at put his 
: hand on top of one of the small transmitters while he was tuneing it up.
: 
: The RF jumped about 1 foot to his wrist and grounded out thru his other 
: arm. Amazingly he survived, but he had very nasty burns right down to the 
: bone on one arm. Cooked flesh looks and smells disgusting!

Even worse, it takes forever to heal.

Bill
Xref: sparky sci.electronics:13323 sci.materials:548 sci.physics:11658 sci.engr.chem:378
From: edb@homecare.com (Bud Biggs)
Newsgroups: sci.electronics,sci.materials,sci.physics,sci.engr.chem
Subject: PZT Excitation
Date: 25 Jul 92 22:20:24 GMT
Distribution: na
Organization: G.O.D Inc.


                       CALL FOR DISCUSSION

What waveforms are satisfactory for exciting hard piezoelectric
ultrasonic transducers and what are the advantages/disadvantages
of these waveforms? Are the answers to these questions a function
of the frequency of the transducer? My own interest is in
transducers in the 2MHz to 10 MHz range, not the 50kHz devices
used in ranging.

A bibliography on the subject would be welcome. This would ideally
include circuits to implement the excitation signals.

Suggestions so far have been:
1)Negative going capacitor discharge for circuit simplicity.
2)Negative going single spike, no reason offered. The example
  given is a symmetrical -110V spike with a 15ns pulse width at
  70% of (negative) peak voltage.
  BTW: This waveform description is based on the generating circuit
  operating on a 50 ohm resistor, _not_ a PZT.
3)A train of pulses at the natural frequency of the transducer, as
  this (allegedly) results in the maximum output from the transducer.

Replies by email, land mail or phone will be gathered and posted if
interest is indicated. I understand that a number of readers do not
post.

  Edward D. Biggs, engineer    The BIGGS Corporation    Phone:  (901) 526-5005
            652 North Third Street      Memphis, TN   38107      USA
         UUCP: ...!banana!homecare!oldno6!edb       ATTMAIL: oldno6!edb
                        INTERNET: edb%oldno6@attmail.com


-- 
  Edward D. Biggs, engineer    The BIGGS Corporation    Phone:  (901) 526-5005
            652 North Third Street      Memphis, TN   38107      USA
         UUCP: ...!banana!homecare!oldno6!edb       ATTMAIL: oldno6!edb
                        INTERNET: edb%oldno6@attmail.com
From: dbell@cup.portal.com (David J Bell)
Newsgroups: sci.electronics
Subject: Re: 0.100" spacing
Date: Fri, 24 Jul 92 12:39:21 PDT
Organization: The Portal System (TM)
Distribution: na

> My fantasty drill press accessory is a X-Y sled that fits on the bench of the
>drill press. This sled would have clips that my circuit board attaches to. Whe
n
>I twist some screws, the sled locks, and when I push it in an X or Y direction
,
>it clicks and locks at every 0.100". Does such a thing exist, or will someone
>take this idea, make a fortune selling these sleds, and give me a free sled
>in exchange?

Well, Derrick, I'll toss this idea out, for free!  If you have the
drill press and other basic tools, you should be able to build a
lead-screw stage pretty easily... It may not have all the bells and
whistles you asked for, but it should work. I would recommend a
base frame of Aluminum bar stock, or even plywood, with two rails
of steel dowl rod, say 1/4", running front-to-back. Add a third
rail, preferably near (but not ON) center, made of 1/4-20 all-thread.
Put a little handwheel on the front end, and you could notch the
wheel to 'click' into place every revolution. Riding on this base
assembly, make a similar carriage with the lead-screw running
left-to-right.

The lead-screws would give you 0.050" steps, actually better than
0.100", since you could hit intermediate grid points for vias
more easily.

Dave
Xref: sparky sci.electronics:13283 rec.video:9545
From: jim@rwsys.lonestar.org (James T. Wyatt)
Subject: Re: SHOCKING STORIES
Organization: R/W Systems, Richland Hills, Texas, USA, 76118-5849
Date: Tue, 28 Jul 1992 05:53:33 GMT

In article <1992Jul21.005244.27329@nuchat.sccsi.com> steve@nuchat.sccsi.com (Steve Nuchia) writes:
>At age three I discovered that I could make the christmas tree
>lights blink by playing with the plug.  It was great fun until
>I got my finger across the contacts.  Three flips on the way
>out from behind the tree, if I counted properly :-)

That's odd, I did the same thing at about that age, but I got zapped when
only one prong went in the extension cord socket. The other went by the side
and touched my hand. Of course, the pin that made it went into hot... 8{*
-- 
James Wyatt  KA5VJL  jim@rwsys.lonestar.org  Semper Gumbi - always flexible!
From: miked@syscon.rn.com (Mike DeMetz)
Newsgroups: sci.electronics
Subject: Re: PC masks from a laser printer??
Date: 27 Jul 92 15:24:12 GMT
Organization: Syscon Corporate Headquarters - South Bend, IN USA

MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham) writes:

>Dear Knowledgeable ones,
>Up until now I have made my PCB's using donut and tape transfers on
>overhead proj film, exposing Electrolube +ve resist on the copper.
>However, as I have now entered the compuer age and bought a cheapy
>PCB CAD program, I need to produce masks from a laser printer.
>I tried the obvious (direct print on transparency), but the result
>was sufficiently porous that the copper looked like a 1/2 tone printers plate
>after etching. What should I do? I'm going to try inking over the printed
>bits on the mask, but that doesn't leave me a long way in front of the 
>stick on donut method.
>Thanks,
>Graham B
Sounds like you do not have a good copier. I have used this method on
Xerox transparency film and exposed it. You can also make a mirror
image on the film and iron it on to the PCBD.
Xref: sparky sci.electronics:13407 rec.audio:10891 alt.folklore.computers:11240