HDTenEightyP/NetNews huggingface dataset:
From: evansmp@uhura.aston.ac.uk (Mark Evans)
Subject: Re: Filtering TV Commercials
Organization: Aston University
Date: Fri, 11 Sep 1992 15:22:54 GMT

wlsmith@valve.heart.rri.uwo.ca (Wayne Smith) writes:
: I have the following...
: About 20 seconds before a commercial, a small white square will flash
: (1 Hz) in the very upper right corner of the screen.  This flashing
: would last for about 15 seconds.  Then maybe 2 seconds before the
: commercial, the white square would come on again, and stay on until the
: commercial starts.  Anyone else ever see this?

This is to let TV companies know what is going on, in the case of the local
company putting out the adverts.

You may also notice the last frame of the commercial remaining on screen for
several seconds in this case.
-- 
-------------------------------------------------------------------------
Mark Evans                                   |evansmp@uhura.aston.ac.uk
+(44) 21 565 1979 (Home)                     |evansmp@cs.aston.ac.uk
+(44) 21 359 6531 x4039 (Office)             |
Newsgroups: sci.electronics
From: gac@orion (G. Andy Cordonier)
Subject: Re: Cordless phones
Organization: Shell Oil
Date: Tue, 8 Sep 92 13:27:14 GMT

In article <EB.92Sep7102909@watergate.lucid.com> eb@lucid.com writes:
>I'm looking for recommendations on cordless phones.  Basically,
 ...
>like to have one that's comfortable to hold, and most cordless phones

>is it in actual use?  Has anyone tried connecting a hands-free headset
>to a cordless phone?

I know of one manufacturer that makes these, WYCOM (spelling?).  It also
includes an FM radio.  Unfortunately, last time I inquired, the phone
wholesaler had a 7 month waiting list.  You may be able to find a 
"prefered" retailer who can get them with a shorter waiting list.  You
won't be able to find any in stock, at least there aren't any here in
Houston.



-- 
Andy Cordonier  \ Any resemblence between my opinions and those of my
(gac@shell.com) \ employer is purely coincidental (or is it fate?).
                             \  "Any sufficiently advanced bullsh*t 
                              \  is indistinguishable from fact."
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Filtering TV Commercials
Date: 5 Sep 92 04:49:03 GMT
Organization: University of Georgia, Athens

In article <55550028@hpscit.sc.hp.com> rkarlqu@hpscit.sc.hp.com (Rick Karlquist) writes:

>BTW, I think this may be the reason that "electronic newspapers"
>have never caught on, because you could filter out advertisements
>with software.

Is that why Prodigy requires you to use _their_ terminal software
and is not compatible with anything else?



-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - we need not imitate mistakes of other states.
Newsgroups: sci.electronics
From: stettbac@isibee3 (Juerg Stettbacher)
Subject: Pull ups on data bus
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: Tin 1.1 PL5
Date: Fri, 11 Sep 1992 09:05:25 GMT

Hello world

Three stateable address and control buses generally need pull ups, to
prevent from accidental accesses. I suppose that's true.

But what about data buses. Can a floating data bus cause any troubles?
(Oscillating, switching currents .. ?)


Thanks for help of any kind
juerg at ethz switzerland 
Xref: sparky sci.electronics:15497 comp.sys.intel:1687
From: davidsen@ariel.crd.GE.COM (william E Davidsen)
Newsgroups: sci.electronics,comp.sys.intel
Subject: Re: Info needed on 16MByte SIMMs for PC
Date: 11 Sep 92 14:07:51 GMT
Reply-To: davidsen@crd.ge.com (bill davidsen)
Organization: GE Corporate R&D Center, Schenectady NY

In article <BuDJsw.8t1@unx.sas.com>, sasbge@ant.unx.sas.com (Gantt Edmiston) writes:
| 
| I'm considering the purchase of a 486DX2 66MHz PC.  The seller (Gateway 2000)
| advertises that these systems are capable of being configured with a 
| maximum of 64MBytes of main DRAM memory.  Investigation has shown that
| their motherboards have four SIMM slots.  Currently, Gateway does not offer
| the 16MByte SIMMs.  In fact, their sales rep sez that they only have the
| 4MByte SIMMs so if I *did* purchase from them, I could currently only
| get a maximum of 16MBytes (four slots X 4MByte SIMM) total configured
| at this time.

  If you want to buy the system now with no memory and wait you will be
able to get the SIMMs in a year of so. No? I didn't think so. You can
get up to 8MB SIMMs right now, if that won't suit your usage go
elsewhere. I wouldn't buy a system with that few sockets anyway, but
that's just my opinion.

  The 33/66 is at a premium right now, and if you can wait a month or
two you will see lower prices and better selection. This doesn't sound
like a really good idea to me, since you might NEVER be able to get the
chips you need, or find that the cost of the upgrade is a ripoff.
-- 
bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
    I admit that when I was in school I wrote COBOL. But I didn't compile.
From: kupiec@hp800.lasalle.edu (Bob Kupiec)
Newsgroups: sci.electronics
Subject: Solder Flux
Date: 13 Sep 92 20:13:52 GMT
Followup-To: poster
Organization: LaSalle University, Philadelphia, PA

Is it advisable to use flux containing Zinc Chloride on sensitive
electronic components?  If not, what is suggested?

-- 
\/\  Bob Kupiec - Amateur Radio: N3MML   UUCP: (Machine is down, please) /\/\/
/\/\   Internet: kupiec@hp800.lasalle.edu      (use INTERNET address.)  /\/\/\
\/\/\    LaSalle University, 20th St. & Olney Ave., Philadelphia, PA   /\/\/\/
/\/\/\     Self-Quote: "I'm MS-DOS free: never had it, never will."   /\/\/\/\
From: rwc@ius4.ius.cs.cmu.edu (Randy Casciola)
Newsgroups: sci.electronics
Subject: Re: substitution of logic families
Keywords: ttl cmos als substitution
Date: 8 Sep 92 11:34:46 GMT
Article-I.D.: cs.Bu9C5y.68B.2
Organization: CMU Vision and Autonomous Systems

>Can LS, ALS, and CMOS (pin compatible) components be substituted
>for TTL parts in general?  I've got an "old" TTL system that needs
>a couple of spare parts, do I need to agonize over speed, power, fan out
>rise times.......or are the newer logic families always "better"?

Check out "CMOS/TTL DIGITAL SYSTEMS DESIGN", by James Buchanan. McGraw Hill
1990.  It has *everything* you would ever want to know about practical
design with digital logic.  It is written for engineers doing real designs,
not students just learning about K-maps and Boolean Algebra.  I found it
most informative.  It will answer all of the questions you have posed.

Randy Casciola
Research Engineer
The Robotics Institute
Carnegie Mellon University
Pittsburgh, Pa
Newsgroups: sci.electronics
From: ifversen@fnalo.fnal.gov (King Under the Mountain)
Subject: Re: Need help to build an Audio Amplifier
Organization: Fermi National Accelerator Lab
Date: Sat, 12 Sep 1992 17:30:17 GMT
X-Posted-From: fnalo.fnal.gov
X-Posted-Through: sol.ctr.columbia.edu

In article <BuG1zz.FzJ.1@cs.cmu.edu>,
 pandey+@cs.cmu.edu (Manish Pandey) writes:
> 
>  I am interested in constructing an audio amplifier and I need some
> help from fellow-netters who may have some experience building one.
> 

  specs deleted to save bandwidth...

>      
>      Also I have power supplies which give me +-27 Volts at 10Amps.
> 
>  Among the options I am exploring are the following
> 
>      1. Using LM12, the power OP AMP manufactured by National Semiconductor.
>         It can deliver upto 150 W of power ( of course limited by pwr
>         supplies)
> 
>         Advantage: Excellent performance, extremely simple
>         Disadvantages: It seems a little bit pricey at $35 for each 
>                        chip and I will probably need 6-8 of these.
> 

   ....

>       Q1 Has anyone used LM12 / TDA1514 to build audio amps ?
>          what has been their experience ?
> 

   I have built several audio amps using the LM12, and have gotten excellent
results.  They are very simple to use, and very forgiving when it comes to
PC board layout.  I used the circuit provided in the data sheets for the
device.  Your power supplies are certainly in the right range, but I think
that you might need a bit more current to get full performance from these
devices (although, it has been a while since I last used the LM12, and my
memory could be a bit fuzzy on this point).  They will work using smaller
supplies, but the power output and overall performance will suffer
proportionally.  If you use the LM12, you may want to consider fan-cooling
the heatsinks.  In the event of an overtemp condition, the chips will shut
down to save themselves -- this will cut out the audio until the temperature
drops back into safe operating range.  Fan cooling will keep the chips running
cool enough so the amp will not cut out.  (I set the system up with klixons
to turn the fan on a little before chip overtemp -- that way the fan is not
on continuously, it just cycles every so often, depending on how hard I drive
the amps...)

   I scrounged my LM12's as engineering samples, so I have no idea how
difficult they are to buy retail.

   I have never used the TDA1514, so I can be of no help there (sorry :-( ).

-------------------------------------------------------------------------------
David J. (djinn) Ifversen              |
FermiLab RD/SOD?/Operations            |  My employer doesn't care about my
Particles -R- Us                       |  opinions, so why should anybody else?
'83 750 Maxim          DoD #0662       |
-------------------------------------------------------------------------------
From: smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC)
Newsgroups: sci.electronics
Subject: Re: A much better power inverter design
Date: 11 Sep 1992 08:09:22 GMT
Organization: SunConnect
Distribution: world
NNTP-Posting-Host: hardy.france.sun.com

In article <BuE4p8.5Bq@acsu.buffalo.edu>, v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:
> 
>    I am a sophomore engineering student and have been researching and
> trying to develop a new type of car amplifier that runs cooler and
> the taim was at the power supply. 


>            So I tried a mechanical method using 2 high
> speed quality relays. The design amazingly worked with little problems,
> like noise from the 60-hz modulated relays, a small amount of magnetic
> intereference which can be solved and slightly warm relays. The only
> major problem I can see is reliabilty. How many cycles can a relay take
> before they burn out, thats the only question. I must do more work and
> improve on this.


That technique was actually widely used in the pre-transistor days, when vibrator invertors were used to step up 12 & 24v supplies to a level which
would drive valves (tubes). It seems to have fallen into disuse with
the arrival of power transistors.

I don't mean that to sound discouraging, it often happens that an old
technology revisited with modern techniques can turn up surprises. A
quick scan through a catalogue shows that low-power relays seem rated
at about 150,000 operations, high-power ones at 20,000,000. That is
probably limited by a combination of metal fatigue & contact burn.

Perhaps trying to find some old vibrator supplies would give parts better
suited to experimentation.

I am a bit surprised that transistors would get too hot. In a pure switching
supply they are either fully on or fully off, and even putting 20A through
a fully on transistor should only cause it to dissipate 16W or so, which
a smallish heatsink should be able to cope with.

Steve
From: fhl@milton.u.washington.edu (Dean Pentcheff)
Newsgroups: sci.electronics
Subject: Re: GPIB control via Macintosh
Date: 15 Sep 92 22:36:34 GMT
Reply-To: dean2@tbone.biol.scarolina.edu (Dean Pentcheff)
Followup-To: sci.electronics
Distribution: usa
Organization: Department of Biology, University of South Carolina, Columbia

markl@research.nj.nec.com (Mark Lee) writes:
)I am trying to convert my lab from MS-DOS based control to Macintosh
)based control.  All my instruments communicate using the GP-IB (IEEE-
)488) standard, which I like very much and want to keep.
)
)Does anyone out there have any experience with or recommendations for
)GP-IB control software and hardware that will run on, say, a Mac IIci or
)a Mac IIfx?  Replies can be emailed to me at markl@research.nec.com.
)
)Thanks in advance,
)Mark
)

Contact National Instruments ((800) 433-3488).  They have a wide range
of GPIB controllers and software for both the Mac and the PC.  For Macs
they have products for the Mac II series, the LC, the SE/30, and the
SE, as well as GPIB/SCSI interfaces.

I've always found their technical support to be excellent.

-Dean
Newsgroups: sci.electronics
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Cheap LCD displays
Organization: College of Engineering, Univ. of Wisconsin--Madison
Date: 12 Sep 92 21:05:33 CDT

Hi,

Are you one of the no doubt numerous people who ordered some of those 16
character by 1 line LCD displays from ... that company ... that advertises
in places like Circuit Cellar Ink?  (They sell lots of LCD displays and a
lot of other assorted neat stuff...)

I those 3 of the 16x1 displays last year for $8 a shot.  Good deal...  Anyway,
I was going to replace one today with a (DigiKey bought, expensive) back-lit
model.  As I pulled out the old one, I noticed that it looked awfully similar
to the new one... especially in that it had two little terminals where the new
one had its back light connection!  Looking closer, it was obvious that the
display had an electroluminescent back light on it!  They sure didn't _TELL_
me that the display was back-lit when I ordered it, and it makes these
displays an even better deal than they already are.

Well anyway, the next problem was getting this thing to light up... I needed
an inverter.  Where to get one?  Well, I remembered that I had bought a
back light unit for some out of production LCD TV awhile back from All
Electronics (they still sell these... I think they're $3.50 or something).
I found that unit, clipped the leads between the back light that came with
it and the inverter, and hooked up the inverter to the LCD display.  Poof!
Instant light!  The display lit up a very pretty blueish color.

Neato.  Needless to say, I'm pretty happy.  The blue color of these cheap
displays looks nicer to me than the green color of the expensive display I
had just bought.

I don't know if the 16x1 displays that are currently being sold are the
same ones, but if they are -- $8 + $3.50 for a decent back lit display is
a great deal!  I hope this post helps out some of you out there that have
these displays and, like me, didn't know that they were backlit.

Have fun...

					---Joel Kolstad
					kolstad@cae.wisc.edu



Newsgroups: sci.electronics
From: panter@micor.ocunix.on.ca (Bill Panter)
Subject: Re: Where does snow come from?
Organization: M.B. Cormier INC., Orleans (Ont)
Date: Wed, 9 Sep 1992 13:42:17 GMT

In article <bu9im9.778@wang.com> djenkins@wang.com (Dave Jenkins) writes:
>smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
>
>
>>The big radio telescopes operate their circuitry close to 0degrees, because
>>they want to see the background noise from the universe.
>I thought some small percentage (1%-5% ?) of the snow on your TV was
>attributable to the background noise.

Sure.  It's about 1% for normal conditions.  That is, the TV is at room
temperature (300 Kelvin) and the universe is at 3 K.  Of course it could
be less than this if the receiver uses real-world components, increasing
the locally produced noise..... -)

Bill Panter
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Newsgroups: sci.electronics
Subject: Re: Filtering wind noise
Date: 12 Sep 1992 14:14:49 GMT
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
NNTP-Posting-Host: skybridge.scl.cwru.edu

I've also seen 'ear-phones' that put the mike in the ear!
I think Lear-Sigler made it. 

I wonder if it would work on Mr. Spock ;-?
--
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: roa@galen.med.Virginia.EDU (Robert O. Anderson)
Subject: photocells and timers and things
Organization: University of Virginia
Date: Tue, 15 Sep 1992 20:01:21 GMT



Project:
        to run a motor for 10-15 seconds at dawn and dusk

I Plan on using a 555 to control the motor(via other components), but
am having a time trying to figure out how to make the photocell to send a
"pulse" the timer. 
Can anyone get me in the right ballpark???  Thanks a bunch.

Bobby

--
    =======================================
        bobby@virginia.edu   (Internet)
         bobby@virginia       (BITNET)
    =======================================
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: TESLA COIL
Date: Fri, 04 Sep 92 20:41:52 CDT
Organization: The Inquiring Mind BBS  1 204 488-1607

al@sys6626.bison.mb.ca (Haus Der Luge) writes:

>  
> I am interested in making myself a TESLA COIL.
>  
> I have called around town here and have had a lot of trouble even finding 
> anybody who knows what a TESLA COIL is.
>  
> My only luck was a short conversation I had with a lab technician for the 
> electrical engineering department at the University of Manitoba ... and I 
> think that he thought that I was either (a) CRAZY or (b) had BAD 
> intentions for this device.
>  
> Neither (a) nor (b) are really true ... although (a) is really a 
> subjective concern.
>  
> I would REALLY appreciate some help if somebody could tell me where to 
> find a schematic, information etc.  (I've looked through about 7 years of 
> SCIENTIFIC AMERICAN "home scientist" articles to no avail.).
>  
> Thanks,
> Haus Der Luge
>  
> 
> 
> ;--- (Haus Der Luge) a user of sys6626, running waffle 1.64
> ;E-mail: al@sys6626.bison.mb.ca
> ;system 6626: 63 point west drive, winnipeg manitoba canada R3T 5G8

Get an Edmond sp? Scientific catalog, and you can order one.

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: rmintz@ecst.csuchico.edu (Rich Mintz)
Subject: Re: Filtering TV Commercials
Organization: California State University, Chico
Date: Sun, 06 Sep 1992 23:22:40 GMT

In Article 29025 Michael Covington writes:
> >BTW, I think this may be the reason that "electronic newspapers"
> >have never caught on, because you could filter out advertisements
> >with software.
> 
> Is that why Prodigy requires you to use _their_ terminal
> software and is not compatible with anything else?
 
 
Prodigy is the exception to the rule here... the great 
majority of online services, including those that deal 
with news, don't require purchasing special software from 
the provider of the info.
 
Also, one thing I should mention: I once called up and 
asked for the intro kit to Prodigy. It came complete with 
diskettes, instructions, a startup password, everything-- 
I think they call it the "startup kit." It was completely 
free-- I called and asked for it; they sent it. Since 
that time, I've heard people (my dad in particular) 
saying he's seen these Prodigy startup kits sold in 
places like Radio Shack for up to $60. I saw the very 
SAME startup kit sitting around in a computer store the 
other day (the owner and I are aquaintances) and he said 
he'd give it away to anyone that wanted it for free... 
since that's what his cost for it was.
 
Last bit of info: My dad called Prodigy to find out what 
the deal was... whether these startup kits are free or if 
there's a charge for them. He was told there was a charge 
for it. Then, on a *subsequent* call, another Prodigy rep 
said that there was NO charge for the startup kit!!
 
Anyway, I know this was changing the subject a bit, but 
thought I'd throw it in.
 
       Rich -> rmintz@cscihp.ecst.csuchico.edu

Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: Transistor Cross Reference Help Needed
Keywords: Dumb Engineer Needs Help
Organization: San Diego State University
Distribution: na
Date: Tue, 15 Sep 1992 18:19:39 GMT

In article <1992Sep15.175136.28862@cbnewse.cb.att.com> cretney@cbnewse.cb.att.com (joseph.e.cretney) writes:
>From: cretney@cbnewse.cb.att.com (joseph.e.cretney)
>Subject: Transistor Cross Reference Help Needed
>Date: Tue, 15 Sep 1992 17:51:36 GMT
>Keywords: Dumb Engineer Needs Help
>
>
>
>HI,
>It's been a long time since I've done analog so bear with me.
>I have a Fisher audio amp that's somewhat fried and I was looking
>for info on how I can cross reference these transistors to get
>an idea on what it's going to take to repair.
>
>All of the transistors are mark such as the ones below.  I'm pretty sure
>these three are toast but I cann't figure out how to cross reference to a 
>replacement part.  
>
>Any Suggestions?????
>      ___________  	      ___________  	      ___________  
>     |     _     |	     |     _     |	     |     _     |
>     |    (_)    |	     |    (_)    |	     |    (_)    |
>     |           |	     |           |	     |           |
>     |           |	     |           |	     |           |
>     |   D612K   |	     |   B632K   |	     |   C2911   |
>     |           |	     |           |	     |           |
>     |  F    5A  |	     |  E    4A  |	     |  T    5B  |
>     |           |	     |           |	     |           |
>     |___________|	     |___________|	     |___________|
>       |   |   |	       |   |   |	       |   |   |
>       |   |   |	       |   |   |	       |   |   |
>       |   |   |	       |   |   |	       |   |   |
>       |   |   |	       |   |   |	       |   |   |
>Thanks 
>Joe Cretney
>att!nwsca!cretney

Most likly 2SD612K, 2SB632K and 2SC911. Japanies don't write 2S prefix on 
the parts.


Peace and Prosperity!
  ---==< 110 >==---
Newsgroups: sci.electronics
From: arm@helix.nih.gov (Andrew Mitz)
Subject: Re: MODIFYING VGA cards for PCs
Followup-To: sci.electronics
Keywords: VGA
Organization: National Institutes of Health, Bethesda
Date: Fri, 11 Sep 1992 13:55:35 GMT

In article <1992Sep11.202617.782@csc.canterbury.ac.nz> geoffrey@cosc.canterbury.ac.nz (Geoff Thomas) writes:
>
>A few questions about modifying VGA cards:
>
>
>1) How can I cram 2 VGA cards into a PC, and have them independently
>addressable? Because of the way DOS handles it's video address space,
>only one card can reside in the video address space, but what if, on a
>3/486 the other card could be given a different address space that
>doesn't clash with the first, and could be addressed via protected mode
>on the 3/486.
>
The good news is that at least one company makes a dual VGA card.
It supports its own special software to switch between the two
VGA adapters on the same card.  The bad news is that I cannot find
my file on special VGA cards.  :-(

>2) Any ideas on how to give the VGA card a flat video memory, rather
>than a paged one?
>
>3) Lastly, is it possible to speed up writes to the video address space?
>Currently its quite slow, and I want to speed it up.
>
The solution to 2 and 3 are to consider video cards that are not VGA.
These can co-exist with VGA cards.  See, for example, some of the 
cards by Number Nine (617-492-0999).



-------------------------------------------------
Andrew Mitz          |    NIH Animal Center
Biomedical Engineer  |    Poolesville, MD
-------------------------------------------------

All opinions expressed are my own.


Xref: sparky sci.electronics:15439 comp.sys.sun.hardware:4315