HDTenEightyP/NetNews huggingface dataset:
From: tching@target.water.ca.gov (Tracy Ching <SysAdmin>)
Subject: Re: Is there 9V size 9V Nicads?
Organization: California State University, Sacramento
Distribution: usa
Date: Wed, 2 Sep 1992 21:59:12 GMT

In article <1992Sep2.133309.18492@panix.com> schuster@panix.com (Michael Schuster) writes:
>In article <1992Sep1.181338.29259@leland.Stanford.EDU> meric@leland.Stanford.EDU (meric ozcan) writes:
>>The 9V size Nicads that I see are 7.2V or 7.5V. However manufacturers
>> ...
>VARTA makes true 9V nicads.      

	Is this true?  I just got some 8.4V NiCads from Varta (one exploded
due to charging it at an accelerated rate... it was expected).  But I
always assumed NiCads in their fundamental value come in 1.2V packages.
Hence, a 7 cell NiCad pack = 8.4V.  -Marketed as 9V batteries.  Is it
true that Varta now has a true 9.0V NiCad for sale?
tching@water.ca.gov

Newsgroups: sci.electronics
From: riepe@ifwm11.ifw.uni-hannover.de (Michael Riepe)
Subject: Re: Solder melting point (was Re: How hot can the 486-50 cpu run ?)
Organization: University of Hannover, Germany - IFW
Date: Fri, 28 Aug 1992 04:30:40 GMT

Sorry everybody - now you're right.
I'm afraid my newsreader didn't catch the Subject: change.

-- 
 Michael Riepe                         <riepe@ifwm11.ifw.uni-hannover.de>

     IIII  FFFFFFFF  WWWW           WWWW             Univerit"at Hannover
    IIII  FFFF       WWWW   WWW   WWWW    Institut f"ur Fertigungstechnik
   IIII  FFFFFFF     WWWW WWWWW WWWW       und spanende Werkzeugmaschinen
  IIII  FFFF         WWWWWW WWWWWW                   Schlosswender Str. 5
 IIII  FFFF          WWWW   WWWW              W-3000 Hannover 1 (Germany)
--
From: dcg5662@hertz.njit.edu (Dave Grabowski (KxiK))
Newsgroups: sci.electronics
Subject: What is 74HC0324?
Date: 27 Aug 92 14:24:58 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.
Originator: dcg5662@hertz.njit.edu


  I posted a msg like this a few days ago, but I just realized today
that I posted the wrong part number. I cancelled that msg, so here it is
again..

  We got a hardware key for a PC parallel port at work and it basically
consists of a 74HC0324 (not HC324) and a bunch of resistors and 3 caps.
The mfr's logo on the chip is VERY similar to National Semiconductor,
but it's slightly different -- different enough to be another
manufacturer. Does ANYONE have an idea what this chip is? I do know that
they are somehow programmable, because we have two keys,  which appear
identical, but they are for different programs, and they are NOT
interchangable.

  Any ideas?! Pleeeeze?!

-Dave
-- 
-----------------------------------------------------------------------------
Kappa Xi Kappa - Over & Above!                         dcg5662@hertz.njit.edu
9 Sussex Ave., Newark, NJ (car theft capital USA)   70721.2222@compuserve.com
Xref: sparky sci.electronics:14909 misc.jobs.resumes:5282 vmsnet.employment:81 alt.dcom.telecom:538 sci.engr:1958
From: hatamian@gandalf.rutgers.edu (ShAhin)
Newsgroups: sci.electronics,misc.jobs.resumes,vmsnet.employment,alt.dcom.telecom,sci.engr
Subject: Hardware/Software Position Wanted
Date: 27 Aug 92 15:39:57 GMT
Followup-To: sci.electronics
Distribution: usa
Organization: Rutgers Univ., New Brunswick, N.J.


Hello everyone,

A friend has asked me to post this for him. Please respond directly
to him by phone or to me via email.

Thanks,

--S

___________________________________________________________________________

Hi,

I am looking for a position in the area of computer software/hardware
and netwroking. I have a MSEE with emphasis on Computer Architecture.
Also, I have 2 years experience in designing both hardware and software
for microprocessor based medical instruments.

I also have about 6 months of experience in design and implementation
of Ethernet LANs using NOVELL3.11.

Please for further info and/or a resume call me at: (201)848-0446.

thanks, 

					Amir S. Hatefi

_____________________________________________________________________________
Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: where to get DSPs?
Organization: San Diego State University
Distribution: sci
Date: Fri, 28 Aug 1992 20:42:51 GMT

In article <DEREKN.92Aug28132439@vw.ece.cmu.edu> derekn@vw.ece.cmu.edu (Derek B. Noonburg) writes:

>The recent issues of Circuit Cellar Ink, Radio Electronics, and QST
>have included a total of four DSP projects.  So now that they've
>convinced me that I want to build a DSP board :-) does anyone know
>where I can get DSP chips in small quantities?  None of the articles
>mentioned any suppliers (unless you want to buy entire kits).

>The articles used the Analog Devices ADSP-2101 and -2105, and the TI
>TMS320C10.  I've also heard good things about the Motorola 56k series
>(the 56156 apparently has an onboard CODEC).  I'm not picky :-)

>The usual places (Digi-Key, Jameco, JDR) do not carry exotic parts
>like these (of course), so I'm looking for somewhere else to buy
>onesies.  I suppose I could try to get samples, but this doesn't seem
>quite ethical (since it's for a personal project), and besides, if I
>ever want to get another one or two, I'd probably be out of luck.

>- Derek

>--
>Derek Noonburg                                derekn@vw.ece.cmu.edu
>Electrical & Computer Engineering Dept., Carnegie Mellon University

Try Newark Electronics, in New Yourk (908)381-1343.


Peace and Prosperity!
  ---==< 110 >==---
Newsgroups: sci.electronics
From: wayne@r-node.gts.org (Wayne)
Subject: Re: Need encoding scheme for TV remote infrared controller
Organization: Public Access UNIX Information System
Date: Thu, 03 Sep 1992 17:12:39 GMT

In article <1992Sep2.181547.28000@aio.jsc.nasa.gov> mancus@zaphod.jsc.nasa.gov (Keith Mancus) writes:
>  Odd.  I've seen "generic" controllers that can be programmed to
>drive a wide variety of remote-controlled devices.  It seems pretty
>difficult to do this w/out any standards!
>
>> Borrow/obtain an oscilloscope....after playing around a bit,
>>you should be able to determine the encoding scheme used, or at the very
>>least which patterns go with which....
> 
>  <groan>  That's just what I was hoping to avoid.  Sigh.
>

It can be done without an oscilloscope, if you have a microprocessor with
a timer handy you can program it to time the high and low periods. I have
done this successfully with a few different controllers. From this 
information you should be able to differentiate between button presses.
This technique may not be effective if you want to emulate the
transmitter because of time delays produced by the reciever but is fine
if you want to build something that operates off of a already available
transmitter like you do.
-- 
Wayne Dawe
wayne@r-node.UUCP
From: schuster@panix.com (Michael Schuster)
Newsgroups: rec.video.cable.tv,sci.electronics,rec.video.sattelite
Subject: Re: Info wanted on strange new 'copyguard' on cable tv system.
Date: 31 Aug 92 23:14:12 GMT
Organization: PANIX Public Access Unix & Internet, NYC

In article <1992Aug31.033534.29866@gagme.chi.il.us> glen@gagme.chi.il.us (Glen R) writes:
>I am in need of some technical assistance regarding a seemingly new
>form of copy protection which I have encountered recently on our cable
>television system.  I will describe.

[description deleted]

Macrovision promoted two new copy protection schemes at a trade
show last year. According to Search Technology (305-745-9992),
a maker of expensive copy protection killers, there are two
new strategies:

- changing the pedestal level in the horizontal blanking interval.
  This has already shoem up on some video tapes (Disney?)

- adding noise to, or phase modulating the color bust signal. This
  was deemed too noisy for consumer videotape protection, since the
  S/N is shit anyway. But they promotef it as a way of preventing
  subscribers from taping cable programs.

The above render all Macrovision killers instantly obsolete.

Search makes a $300 box which fixes all the above.





-- 
_______________________________Mike Schuster________________________________
NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
The Portal (R) System: schuster@cup.portal.com   | MCI Mail,GEnie: MSCHUSTER
-- 
_______________________________Mike Schuster________________________________
NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
The Portal (R) System: schuster@cup.portal.com   | MCI Mail,GEnie: MSCHUSTER
From: rbs@uk.ac.ed.aisb (Robert Scott)
Newsgroups: sci.electronics
Subject: Re: Power supply regulation
Date: 26 Aug 92 17:56:15 GMT
	<1992Aug26.012504.10438@uhura.neoucom.edu>
Reply-To: rbs@aisb.ed.ac.uk
Distribution: sci
Organization: Dept AI, Edinburgh University, Scotland

In article <1992Aug26.012504.10438@uhura.neoucom.edu> wtm@uhura.neoucom.edu (Bill Mayhew) writes:

   If you are trying to regulate a 60 volt supply, the outboard
   components to protect the 3-terminal regulator are going to begin
   to become complex.  It would probably be just as easy to use
   discrete components for the pass elements.

Is there something inherently difficult in producing a regulator chip
to regulate more than 40 volts?
This seems to be the limit for regulators that I can get hold of
through DIY electronics stores.

What would be good is for a regulator that would regulate high voltages
but switching the high currents through a power transistor.
I have seen regulators like this but again they seem to go up to 40 volts
only.
A poster did send me the number of a TI chip to do this but I haven't seen
it advertised over here.

Does this style of regulator handle over current?

I'm just curious that it is hard to get ready built regulators that
will handle say +-80 volts at say 10 amps which is the sort of thing one
needs for audio power amps.
At least I haven't seen any.




--
Rob Scott
---
Department of AI                Tel: 031-650-2713
University of Edinburgh         FAX: 031-226-2730
80 South Bridge               email: rbs@aisb.ed.ac.uk
EDINBURGH
EH1 1HN
Newsgroups: sci.electronics
From: sgi@sinope.si.macsch.com (Son Giang)
Subject: Re: multi-standard VCR`S  (Re: NTSC to PAL  Did anyone try?  )
Organization: The MacNeal-Schwendler Corporation
Date: Thu, 3 Sep 92 16:36:15 GMT

>	Check the Sunday edition of New York Times. A company whose name
>	escapes me at the moment advertises such VCRs and TVs (among other
>	things). Its ad occupies  the whole last page of a section of NYT).
>
>	Once upon a time (at least a year ago) I got a catalog from
>	42st Photo (name?) (it also has ads on NYT) that also
>	advertised multiple system VCR and TVs (from Philips,
>	Sony, JVC).  Prices were in the range of high $300's to $600 (for VCRs).
>
>	BTW, I've never purchased any such system from
>	either of these companies.
>
>	Hope this helps,
>	alex


Also, check the ads in Video Magazine.
-- 
Son Giang
The MacNeal-Schwenlder Corporation
email s_giang@mscsch.com
tel: 213 259 4967
Newsgroups: sci.electronics
From: jbm@eos.arc.nasa.gov (Jeffrey Mulligan)
Subject: Re: Filtering wind noise
Organization: NASA Ames Research Center
Distribution: usa
Date: Wed, 2 Sep 1992 02:06:57 GMT

riepe@ifwm11.ifw.uni-hannover.de (Michael Riepe) writes:

>In article <24875@castle.ed.ac.uk>, cam@castle.ed.ac.uk (Chris Malcolm) writes:
>|> In article <dfAW02=71de601@JUTS.ccc.amdahl.com> drp40@cd.amdahl.com writes:
>|> 
>|> >I'd like to be able to use two-way radios for skydiving.  Problem
>|> >is, 120mph of wind hitting up against a microphone would probably
>|> >mask out any voices.  Anyone have any ideas of how to get around
>|> >this?
>|> 
>|> 	1) A throat mike under clothing.
>|> 
>|> 	2) Use combined ear speaker/mike, inside substantial ear muff.
>|> 	The voice gets to the ear via head transmission.

>3) Use 2 mikes connected to a differential amplifier.

I don't get it; don't you want to sum the signals from the two mikes?
Assuming they both pick up the same voice signals, but that the
noise from each is uncorrelated, this would improve the SNR by sqrt(2).

This reminded me of the solution to the problem of allowing pilots
to understand voice communications on their headsets in the presence
of lots of noise from the aircraft.  Legend has it that this was
discovered by chance when someone made a wiring error, but the idea
is that one ear's speaker is wired up backwards, so that that ear
gets an inverted signal.  The noise, which comes throught the air
is correlated, between the two ears, while the signal is anti-correlated.
It is an empirical psychological finding that this improves the
"perceptual SNR"; this is thought to be related to the mechanisms of
sound localization.

Maybe this idea could be combined with the two mike idea:  one mike
per ear.  The listener's brain might do some of the work of
separating correlated voice signals from the uncorrelated
noises from the two mikes, as well as the uncorrelated wind noise
generated at each ear.

Unfortunately, this would require twice as many radios, or some
kind of modulator/demodulator to send both signals using one radio...

-- 

	Jeff Mulligan (jbm@eos.arc.nasa.gov)
	NASA/Ames Research Ctr., Mail Stop 262-2, Moffett Field CA, 94035
	(415) 604-3745
Newsgroups: sci.electronics
From: berger@atropa (Mike Berger)
Subject: Re: Old laser rejuvenation
Organization: University of Illinois at Urbana
Distribution: usa
Date: Thu, 27 Aug 1992 01:27:59 GMT

cgordon@vpnet.chi.il.us (gordon hlavenka) writes:
>I have an _ancient_ laser which almost works.  It's a HeNe laser,
>model 3100 from Gaertner Scientific (circa 1969).  It worked for a
>while, but now has developed an electrical problem.
*----
In 1969, laser tube seals weren't very permanent (they're still
not).  Helium is pretty small, and will eventually make its way
out of almost anything.

I'll bet your tube is a little low on gas.
--
	Mike Berger
	Department of Statistics, University of Illinois
	AT&TNET     217-244-6067
	Internet    berger@atropa.stat.uiuc.edu
From: bob@reed.edu (Robert Ankeney)
Newsgroups: sci.electronics
Subject: SER 486 motherboard info needed
Date: 27 Aug 92 23:02:35 GMT
Article-I.D.: reed.1992Aug27.230235.1170
Organization: Reed College, Portland, OR


     I recently got a 486 motherboard at an auction, sans documentation.
It has an attached memory board, with bank 0 on the left side and banks
1 and 2 on the right, with a 5-position DIP switch to configure it.
The mother board has a 486 with a Chips & Technology chipset in the middle
of the board.  Screened near the CPU is a note regarding CPU selection
(JP2 CPU SELECT).  The board has a 4-chip AMI bios.  Other than that,
there is no manufacturer's name other than the box it came in labelled
"SER" on the top..  Also the motherboard has a part number 702440B and
35-2495-01 on it.
     Does anyone have any info regarding this set?  Jumper info would
be especially nice.  Schematic even nicer!  Or a number for someone who
handles SER parts even?!

     Thanks for the info,
     Robert
Newsgroups: sci.electronics
From: whos@ddsw1.mcs.com (Ben Feen)
Subject: TV xmission by VHF radio?
Organization: ddsw1.MCS.COM Contributor, Chicago, IL
Date: Sat, 29 Aug 1992 19:28:30 GMT
X-Disclaimer:  Material posted in this article is the sole responsibility of
                the poster and does not represent MCSNet or the system owners.

Here's a scenario:
A VCR's Video line out is connected to the mic input of a VHF radio xmitter.
A short distance away, a scanner has its earphone output connected to a VCR's
video input.

Would this work, and if not, why not?

-- 
Mail whos@ddsw1.mcs.com. | Whos at ddsw1? | Yes! | What? | No, whos! | Huh? |
Who? | Who what? | No, whos@ddsw1.mcs.com!  | Where? | DDSW1! | Who's there?|
Right! | Right? | Yes! | Oh, right@ddsw1.mcs.com? | No, WHOS@ddsw1.mcs.com! |
That's what I wanna find out! | What? | Who! | He's at ddsw1! | AAAAAAAAAGH!|
From: shirish@sequoiasequoia.com (Shirish Jamthe)
Newsgroups: sci.electronics
Subject: Info. wanted about CD changers
Date: 28 Aug 92 21:03:15 GMT
X-Newsreader: Tin 1.1 PL3


	Information wanted regarding CD changers 

	Hi,

		I am planning to buy a CD changer and a portable
	stereo system with CD input-line. I you have any information
	regarding these or any pamplets etc. and if you can share that
	to me I would be grateful.

		I have almost nil knowledge regarding CDs so any input
	is welcome.

		I am at shirish@sequoia.sequoia.com . 

--
Shirish x1670
--
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: What is a Fresnel lens? -- was Re: That Magic TV screen
Date: 25 Aug 92 17:27:20 GMT
Article-I.D.: athena.1992Aug25.172720.7172
Organization: University of Georgia, Athens

Two different devices are called a Fresnel lens:

(1) A device that works by diffraction, and is seen mainly in optics
textbooks.  This device is very wavelength-specific.

(2) A collapsed convex lens, in concentric zones.  This is what "magnifying
sheets" are made of, and is also found in projectors and spotlights.
It is wavelength-sensitive only to the extent of the chromatic dispersion
of the glass.

-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - don't tie education to an unpredictable income.
From: tomb@hplsla.hp.com (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: Success! Resist Pen Works in HP Plotter!
Date: 31 Aug 92 16:06:40 GMT
Organization: HP Lake Stevens, WA

rubin@chocktaw.cis.ohio-state.edu (Daniel Rubin) writes:

>Can the HP plotter correctly position a copper clad board?  I did not 
>know that it could handle material that thick.  If so this sounds like
>a much better route to take than messing with transfer sheets!

The modern HP plotters use a grit wheel drive system that relies on
"imprinting" the paper with the grit wheel pattern for proper repositioning.
It's more likely to work if you tape the board material to a stable piece
of paper.  But also be careful of plotters that have too high an 
acceleration.  Even if you set the speed low, it will try to slew
quickly when the pen is up.  The mass of the board may mess you up.

A potentially better solution is a flatbed plotter.  You may even be
able to find an HP 7220 or similar cheaper than a 7470.  Neither is
in current production.  Prices vary a great deal, depending a lot on
if you get it from an individual or a surplus equipment company.
One problem with the 7220, at least, is that it doesn't _normally_
lift the pen high enough to clear a 1/16" PC board, though a shortened
pen, or one not screwed into a holder all the way, can work.  Also,
for anyone with a 7220, be careful thinking you can modify the pen
stalls to hold a taller drafting pen:  the original design relies on
the pen top being constrained by the "roof" of the stall.  I found this
out the hard way ;-)

You can get pen holders for drafting pens pretty cheap from HP; the
holder is the part that the pen pickup "hand" knows how to hold.  That
could save quite a bit of futzing in the machine shop.  And if you
can get liquid ink of about the right consistency, a refillable drafting
pen might be just the ticket.

Many thanks to Dave for his trip around Austin testing pen inks!
Now maybe I can get my 7220 working on this, too!

Cheers,
Tom
Xref: sparky sci.electronics:15164 rec.video:10861
From: brown@vidiot.UUCP (Vidiot)
Newsgroups: sci.electronics,rec.video
Subject: Re: Macrovision
Date: 3 Sep 92 02:46:55 GMT
Reply-To: brown@vidiot.UUCP (Vidiot)
Organization: Vidiot's Hangout

In article <1992Sep2.041037.347@u.washington.edu> bunky@milton.u.washington.edu (Mike) writes:
<
<     
<     Does anyone know how macrovision allows a video tape to be watched on
<     a television but not on a vcr?  I recently looked at a copy protected
<     videotape and it appeared that there were 4 white bars on the last
<     8 or 9 lines in the vertical interval that periodicly (every 15 or 20
<     sec) faded in and out.  It looks like it's changing the average level
<     of the picture to mess up the vcr.  If that's the case could this be
<     fixed with a clamping circuit or some kind of dc restorer circuit?
<     If anyone knows the technical details of how the copy protection scheme
<     works I would be very interested. 

I posted how Macrovision works a little bit ago.

What you can't see are the extra horizontal sync pulses right before the white
pulses.  Those and the white pules are what affect the VCR that tries to dub
the protected tape.
-- 
      harvard\                          spool.cs.wisc.edu!astroatc!vidiot!brown
Vidiot  ucbvax!uwvax..........!astroatc!vidiot!brown
      rutgers/            INTERNET:vidiot!brown%astroatc.UUCP@spool.cs.wisc.edu
                                   brown@wi.extrel.com
Newsgroups: sci.electronics
From: arkusins@esseye.si.com (Andy Arkusinski)
Subject: Re: GPS questions
Organization: Smiths Industries
Distribution: usa
Date: Tue, 25 Aug 1992 17:11:11 GMT

In <2041@deadmin.ucsd.edu> gumby@ucsd.edu (Henry Ptasinski) writes:

>The CROSS-CORRELATION between two PN sequences can have  
>large peaks at some values of tau, even if the PN codes are not identical.   
>Careful selection of the PN sequences is required in order to have a set with
>good cross-correlation properties.

Of course you're right.  The GPS PN sequences have been carefully selected
so that there are 37 unique codes that are supposedly especially easy
to acquire.

>gsulliva@enuxha.eas.asu.edu (Allen Sullivan) writes:

>I would expect there to be problems in discriminating among codes if very
>short sublengths were tested for. For example, 1100111000 probably occurs
>in all the codes. So once "trial correlation" happens, longer/entire pattern
>matches must be done. What is a useful sublength to use, to adequately avoid
>false trial correlations?

Since the code repeats 1000 times a second, why wouldn't you use the whole
thing?  A particular receiver we're using here takes 5 minutes to "search
the sky" for each satellite in order (starting with PRN 6) when it has no
almanac information. It takes 18-20 minutes for acquisition if PRN 6 is in
view. (Since PRN 6 is no longer in service, acquisition times of over an
hour are not uncommon.) This compares to 2-3 minutes if the receiver has a
current almanac and knows which satellites are visible. While I don't have
access to the internals of the receiver, I suspect it uses the entire 1023
bits of the C/A code.
-- 
Andy Arkusinski					arkusinski@benzie.si.com
Smiths Industries				arkusinski@esseye.si.com
Grand Rapids, MI
Newsgroups: sci.electronics
From: johnh@macadammq.edu.au (John Haddy)
Subject: Acronyms & Abbreviations
Organization: Macquarie University, School of Mathematics, Physics, Computing and Electronics
Date: Mon, 31 Aug 1992 22:16:59 GMT

I'd like to create the canonical list of acronyms and abbreviations used in the
electronics and computer world.

Please send me your suggestions and contributions. Better still, does one already
exist? (Save me the effort :-)

I'll post the result in a month or so.

This is the sort of thing that regularly needs updating, so please inform me
whenever you run across a new abbreviation.

John Haddy

----------------------------------------------------------------------------

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    |_| (_) | | | |  | | (_| (_| (_| \/           School of MPCE
    ---------------------------------/-           Macquarie University
                                                  Sydney, AUSTRALIA 2109

    Email: johnh@mpce.mq.edu.au, Ph: +61 2 805 8959, Fax: +61 2 805 8983

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Newsgroups: sci.electronics