HDTenEightyP/NetNews huggingface dataset:
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: Creating sci.semiconductors
Originator: sehari@vincent2.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Thu, 12 Nov 1992 20:28:48 GMT

---

I submitted a formal request for creation of this "Wild" newsgroup.
There are some procedural steps that we should follow. The first
step of this is under way. We should get the first formal posting
for creation of this network wide and "wild" newsgroup soon.

                      With highest regards,
                           Babak   Sehari



--
From: craig@toontown.ColumbiaSC.NCR.COM (Craig S. Williamson)
Newsgroups: sci.electronics
Subject: Re: Connecting TV screen to computer
Date: 11 Nov 92 19:06:43 GMT
Reply-To: craig@toontown.ColumbiaSC.NCR.COM (Craig S. Williamson)
Organization: NCR E&M Columbia, SC

In article <sehari.721281735@class1.iastate.edu> sehari@iastate.edu (Babak Sehari) writes:
|In <1992Nov8.122328.44521@kuhub.cc.ukans.edu> christos@kuhub.cc.ukans.edu writes:
|
|>HEllo there,
|
|>	I am interested in connecting my TV screen to the computer and replace
|>it with my monitor. Is that possible? I have seen people doing it but what are
|>the precautions that need to be taken into account so that I won't blow up
|>anything and how can I really do this? Where can I get inforamtion about it?
|
|>	I would apprecoiate any relevant response.
|
|>Thanks,
|>Chris.
|>Internet Address: christos@kuhub.cc.ukans.edu
|
|
|TENEX has a card that does that and much more, you could even edit
|the TV Program, capture frames into disk, or make it come out of a windows
|window in the corner of your monitor. This allows you to work at something
|else and watch TV at the same time.  Their Phone # 1-800-776-6781.
|
|                         With highest regards,
|                              Babak   Sehari.
But will it work in a 1024x768 screen?  Most of those only work in 
standard VGA and I would like the same thing for a better resolution.
I find standard VGA useless for windows.

Craig


-- 
                                                 "If only real life was
-Craig Williamson                                      like this."
 Craig.Williamson@ColumbiaSC.NCR.COM               -Count Duckula
 craig@toontown.ColumbiaSC.NCR.COM (home)
From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Re: Idea for LED sequencer
Date: 4 Nov 92 10:36:27 GMT
Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Organization: Dept Electrical and Electronic Eng, Manchester University, UK

In article <2789@tau-ceti.isc-br.com> jimc@tau-ceti.isc-br.com (Jim Cathey) writes:
>In article <1992Nov3.094923.44351@kuhub.cc.ukans.edu> heacock@kuhub.cc.ukans.edu (Doug Heacock) writes:
>>I'm putting together a quick-and-dirty circuit that will light 10
>>LED's in sequence, one after the other.  Here's my idea so far:  I

[...]
>Why not try a shift register?  Something like a single 74LS374 and a single
>74LS74 should be easy to flange up into a reset-to-1 10-stage ring shifter.
>There should be CMOS analogs of these parts.
>
>-- 
>+----------------+
>! II      CCCCCC !  Jim Cathey

What about the 4017? This is a Johnson type decade counter - you
put in a clock and each of it's 10 outputs goes high in turn. It
has the usual reset and inhibit pins.

problems-
1. The pinout was tampered with by the KGB to make it totally 
   impossible to design a PCB for it.

2. I don't think you're supposed to drive LEDs directly from CMOS
   outputs- but it should be OK as long as you don't want them too
   bright.

Mark
mark-r@spec0.ee.man.ac.uk
--
_____________________________________________________________________
Multimedia Information Systems Lab | Witty anecdote available real
Dept. Of Electrical Engineering    | soon now - just as soon as
University of Manchester           | MS releases it's long avaited
Dover St. Manchester. M13 9PL      | WittyAnecdote NT (TM).
From: stanb@hpnmdla.sr.hp.com (Stan Bischof)
Newsgroups: sci.electronics
Subject: Re: Er, is there a problem?  WasRe: 486 CPU KOOLERS FOR SALE
Date: 6 Nov 92 19:23:00 GMT
Organization: Hewlett-Packard, Santa Rosa, CA

In sci.electronics, legrady@ug.cs.dal.ca (Tom Legrady) writes:

>I don't know about the exact relationship of heat and lifetime for
>electronics comnponents, but there is an inverse exponential effect on
>the life of high-intensity lamps, such as the ones used for stage
>lighting. I have to fudge the exact numbers, since I've been out of
>theatre for a number of years, but dropping a lamp to 90% full
>intensity generally doubles the expected life of a lamp. Dropping to
>80% results in an unlimited expected life. Since our reaction to light
>is non-linear, dropping to 90% has little effect on preceived
>brightness. Since the lamps used cost $30 - $50  or more apiece and
>have an expected life ranging from 300 - 2000 hours, doubling the life
>is a desirable things to do. Of course, if you drop it, it still dies. 

>I would suspect ( but without any evidence ) that similar effects hold
>with electronics, that a relatively minor reduction in heat would have
>a great effect on life and operation.


>Tom Legrady

As a matter of fact this does indeed occur. One rough rule-of-thumb
at least for silicon devices (most applications) says that lifetime
is roughly doubled for every 10 degree drop in temp.

disclaimer: please, folks, this is only a rule-of-thumb, so please
don't respond with all the various reasons why this relation is
not completely accurate!

Stan Bischof
HPSR

********************************************************************
As usual, this is purely personal opinion and in no way is a statement
of the opinions of my employer, Hewlett-Packard.
********************************************************************
From: sdmw91tw@ap08.rz.tu-harburg.de (Thorsten Wollweber - 04105/53359 )
Newsgroups: sci.electronics
Subject: Eproms
Date: 5 Nov 92 13:07:35 GMT
Organization: none
Originator: sdmw91tw@ap08.cip3a.tu-harburg.de


I have a little problem with megabit-EPROMs:

Are there any differences between 27c010-120 and 27c020-150 other than:
- double memory
- higher access time  ?

I was trying to replace the 1Mbit Eproms with 2Mbit, but the system does not
recognize the chips at all. At least, when I am trying to read from the 
2Mbit Eprom the system acts as if there was no chip at all.

_BUT_ when I used another chip with a different software on, there seem to be some bits
that can be read. Otherwise it appears similar to the other chip.

BTW, my prommer works fine with those 2Mbit chips. It recognizes them, writes to them, and
reads with _no_ error at all.

What is the problem?


   _________________________________________
  |                                         |
  |   So long and Thanks for all the Fish,  |
  |                                         |
  |      wollweber@tu-harburg.dbp.de        |
  |_________________________________________|
From: ah335@cleveland.Freenet.Edu (Richard Banks)
Newsgroups: sci.electronics
Subject: Home made personal handheld stun-gun projects?
Date: 8 Nov 1992 19:13:09 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: ah335@cleveland.Freenet.Edu (Richard Banks)
NNTP-Posting-Host: slc10.ins.cwru.edu


Has anyone out there ever attempted and/or completed a home made
stun-gun device of any type?  I'm very interested in this and
I have some ideas, but I wanted to first hear from someone
who has done this before.  It would seem rather simple to make
a cheap effective stun-gun.
From: curt@oasys.dt.navy.mil (Curt Welch)
Newsgroups: sci.electronics
Subject: Re: Adding a Second Phone Line
Date: 6 Nov 92 16:54:49 GMT
Article-I.D.: oasys.27263
Reply-To: curt@oasys.dt.navy.mil (Curt Welch)
Distribution: usa
Organization: Carderock Division, NSWC, Bethesda, MD

wrb@cbnews.cb.att.com (wallace.r.blackburn) writes:
>If you get them backwards, the phone will work, that is you will be able to
>answer an incoming call.  But it won't dial out.  If this happens, just
>switch the two wires around.

In sci.electronics, rickert@mp.cs.niu.edu (Neil Rickert) writes:
>Perhaps this depends on the type of telephone.  Many 'phones seem to work
>and dial out with either polarity.

Yes, it does depend on the phone.  Most new phones today do not care about
the polarity.

Here's the story I heard about phone polarity.  All the old AT&T network
was wired with correct and consistant polarity.  And the old AT&T touchtone
phones required correct polarity to drive the touchtone keypad.  As the
person above noted, if you got it backwards, the phone would work, but the
touchtone keypad wouldn't.

But some phone systems, like GTE, didn't have their network
consistantly wired.  So the GTE phones had a bridge rectifier built
into them so that they would work no matter how the jacks were wired.

And this wasn't just a problem of wiring the jacks correctly.  With
some GTE CO switches, the polarity of your phone would change depending
on who you called.  So if you had an AT&T phone connected to a GTE
system, the keypad might stop working after you placed the call.  There
was a time when GTE would come out and install a rectifier in your
phone to fix this problem if you asked them to.

Today, especially with all the do-it-yourself home wiring, most, if not
all, new phones will work either way.

Curt
Newsgroups: sci.electronics
From: mwandel@bnr.ca (Markus Wandel)
Subject: Re: microcontrollers
Keywords: sizes? Exrternal Memory Capability
Organization: bnr
Date: Thu, 12 Nov 1992 18:00:27 GMT

In article <1992Nov12.023508.13285@tamsun.tamu.edu> rahhelp@rigel.tamu.edu (Ronald A. Huizar) writes:
>
>One problem that I am already see is that the microcontroller I was
>planning to use the MC68HC811E2 can only address about 64K of external
>memory, and we are planning/contemplating storing the message
>digitally. I have not had much DSP, my partner has had more than I,
>but I figure that for the telephone we will need to sample at least
>6000 Hz (since the phone BW is 30-3000, you remember Nyquist don't
>you). For a 1 minute (kinda long I know) message that will require
>about 3 Meg of memeory. To much for the E2. So I know that the
>microprocessors can handle the amount of memory I would need but I did
>want to have build my own computer first.

Well, return to a technique that was common in the old days... bank
switching.  Say you have a 16Mx8 memory bank that you wish to stash your
audio samples in but only a 16-bit address processor to do the stashing.
Well, just feed the other 8 address bits from a parallel output
port.  You then have 256 banks of 64K bytes, selectable by writing the
bank number to the output port.  If you are just storing samples in memory
sequentially it is not a big deal to increment the bank number every time
your 16-bit address counter overflows.

For sampling, your best bet may be a standard telephone codec
(if you get one), which will give you 8K samples/sec.  Nyquist says 2X
the highest audio frequency, but Nyquist has an ideal antialiasing
filter and you don't.

Given the cost of DRAM, it may be reasonable to use a hard disk (an IDE
one should be easy to interface to, SCSI is still reasonable) for voice
storage, or a small DSP for on-the-fly audio compression if you know
an algorithm (I don't).

Markus Wandel
markus@pinetree.org <-- NOT the source of this posting.
Newsgroups: sci.electronics
From: kaiser@rtsg.mot.com (Bradley G. Kaiser)
Subject: Teeny-weeny Sony power connector?
Followup-To: sci.electronics
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: usa
Date: Wed, 11 Nov 1992 22:21:15 GMT


I have a Sony Walkman cassette player model WM-FX50.  Its DC 
power input (1.5V,700 mA) takes a very small (~1.3 mm dia, 
~1 cm long) coaxial-type plug.  I bought the Sony AC adapter 
($35 !!!), then promptly dropped the Walkman on the floor 
while it was plugged into the adapter, which snapped that 
tiny plug right off.

Anybody have any idea where I could get a replacement plug?  I've
tried everywhere I can think of (Radio Shack, Newark, a local hobby
place ...) with no luck; I'm sure Sony will want to sell me a new
adapter for another $35, even though only the plug is broken.

Any ideas?

Brad Kaiser
(bradk@isdgsm.rtsg.mot.com)


Newsgroups: sci.electronics
From: parkyn@fraser.sfu.ca (Dale Parkyn)
Subject: Re: making mono from stereo
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Tue, 10 Nov 1992 17:34:30 GMT

Interesting... I wondered why some stereo speaker placements put a 
single bass source somewhere in the room and mid-high as pair...
Newsgroups: sci.electronics
From: bill@occs.cs.oberlin.edu (Bill Mohler)
Subject: GPIB card for sale
Organization: Oberlin College Computer Science
Date: Mon, 9 Nov 1992 13:17:58 GMT
Distribution: sci.electronics
X-Posted-From: occs.cs.oberlin.edu
NNTP-Posting-Host: sol.ctr.columbia.edu


For sale, one Scientific Solutions IEEE-488 controller card for IBM type
computers. 8-bit, 3/4 length card, with manual and "Basic" software. 
Looks in good shape, does not lock up the computer when installed, but I
have no equipment to try it on! Asking $25 or best offer to
bill@occs.cs.oberlin.edu
Newsgroups: sci.electronics
Subject: WANTED: Recommendation on DSP book(s)
From: cyborg@kauri.vuw.ac.nz (-xivo-Alex Ivopol)
Date: Tue, 10 Nov 1992 04:51:19 GMT
Organization: Victoria University of Wellington


   I am looking for a book on Digital Signal Processing that concentrates
on algorithmic implementations (or at least has algorithmic examples) of
DSP functions such as filters, FFT, frequency shifting and what not.

   Any pointers, references will be greatly appreciated.

PS. It would help if the algorithms were in pseudocode or some language
such as C or Pascal. I can't handle Fortran :-)

-- 
--
Alex T. Ivopol 
cyborg@kauri.vuw.ac.nz
Standard disclaimer applies.
Newsgroups: sci.electronics
From: mike@vpnet.chi.il.us (michael kamlet)
Subject: Help with Remote Control Device
Reply-To: mike@vpnet.chi.il.us
Organization: Vpnet Public Access
Distribution: na
Date: Fri, 06 Nov 1992 21:26:19 GMT

Hi - I'm looking for a way to make a very simple remote control -- Not IR
device.   All I need it to do is act as an on/off switch.
The receiver needs to be real small, but I really don't care about
the transmitter size.  

I've tried looking on my own, but haven't seen anything that would work

Thanks

	Mike Kamlet
	mike@vpnet.chi.il.us
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: the KGB vs. LED sequencers
Date: 5 Nov 92 21:03:13 GMT
Organization: University of Pennsylvania, Mechanical Engineering


:What about the 4017? This is a Johnson type decade counter - you
:put in a clock and each of it's 10 outputs goes high in turn. It
:has the usual reset and inhibit pins.
:
:problems-
:1. The pinout was tampered with by the KGB to make it totally 
:   impossible to design a PCB for it.
:

as a newcomer, i find this with many ic's.  Is there really some
sense to the pinouts ( in general ) or are the pinouts driven
enitirely by internal chip circuit design considerations?



--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
From: diego@ds5000.dgsca.unam.mx (Diego Martin Zamboni)
Newsgroups: sci.electronics
Subject: Info on holostore
Date: 6 Nov 92 23:28:04 GMT
Article-I.D.: news.BxBIIs.67q
Organization: Universidad Nacional Aut'onoma de M'exico
Originator: diego@ds5000.dgsca.unam.mx


Hi everybody:

	I don't know if this is the right place to post this question, so
forgive me if it isn't. I've read about a new massive storage device whose
research apparently started at Bellcore Labs and now it is being done at
Microelectronics and Computer Technology Corp. (MCC). It's called Photo-
refractive Volume Holographic Storage (PVHS) or holostore for short. It
uses holographic techniques for storing data as light patterns in crystals
of some material called strontium barium niobate, and it's impressive in
storage capacity (apparently now they can store up to 2 GB in a 3x3x0.5 cm
module, and think to increase that number) and transfer speeds (100 to
800 MB per second).
	Ok. So much for the introduction. I read an article about this
technology in the November 1990 issue of Byte Magazine, but have not found
anything else about it. I've got to give a talk about some novel massive
storage device, so I thought I could talk about the holostore. It would
be great if someone could give me more information about it, or tell me
where I can get more info. Also, is somebody knows about another newsgroup
or mail-list where I could get what I need, please give me its name and/or
address.
	If possible, mail any answers to me, since I don't always have the
time to read the news.

	Thank you in advance.

-- 
*************************************************************************
* Diego Martin Zamboni       * Depto. de Administracion de Supercomputo *
* diego@ds5000.dgsca.unam.mx * D.G.S.C.A., UNAM, Mexico.                *
*       (132.248.10.8)       *                                          *
*************************************************************************
-- 
*************************************************************************
* Diego Martin Zamboni       * Depto. de Administracion de Supercomputo *
* diego@ds5000.dgsca.unam.mx * D.G.S.C.A., UNAM, Mexico.                *
*       (132.248.10.8)       *                                          *
From: smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC)
Newsgroups: sci.electronics
Subject: Re: Monitors
Date: 9 Nov 1992 16:40:58 GMT
Organization: SunConnect
Distribution: world
NNTP-Posting-Host: hardy.france.sun.com

In article <UezapLq00VB3MIcLhC@andrew.cmu.edu>, geek+@CMU.EDU (Brian E. Gallew) writes:
> Are there any companies that sell color monitors, as opposed to TV's?
> Since I own a VCR, I can't see buying a TV with it's own tuning
> system.  A monitor should (hopefully) be cheaper than a TV.  I don't
> even need any sound in the monitor, as I run the audio output of the
> VCR through my stereo.

Most companies who make TVs make monitor versions, usually for the
educational market, for exactly the situation you describe.

They won't necessarily be cheaper, because the Tuner & IF stages are
pretty cheap, but for monitor use the set has to incorporate some kind of
isolated power supply. If the original design doesn't have that the extra
cost can outweigh the savings from dropping the tuner.

The other alternative is a computer monitor, many of them can take 
composite video in and they often give a much better picture than a TV
by virtue of their better-quality tubes.

Steve

-- 
Steve McKinty
SUN Microsystems ICNC
38240 Meylan, France
email: smckinty@france.sun.com	   BIX: smckinty
Newsgroups: sci.electronics
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: Re: Phone line monitor
Organization: The World
	<1992Nov10.135145.6174@bnr.ca> <BxJ15D.6vK@undergrad.math.waterloo.edu>
Date: Wed, 11 Nov 1992 13:33:51 GMT

In article <BxJ15D.6vK@undergrad.math.waterloo.edu> bwrossma@cantor.math.uwaterloo.ca (Brian Rossmajer) writes:

   In article <1992Nov10.135145.6174@bnr.ca> mwandel@bnr.ca (Markus Wandel) 
   asks for a phone line monitor.  I`ve been comtemplating this myself
   for a while now.  Couldn`t you just hook up an op-amp with the - input
   to the phone ground and battery ground and the tip to the + input of 
   the op-amp.   Then power an LED off the output of the amp.  With a pot,
   If you want to minimize loading, put some precision resistors (say 1 Mohm)
   in a voltage divider across the phone line, and your op-amp goes between
   ground and tip div 2.

   This should be safe and easy, but I haven`t built it and I haven`t done
   the calculations.  Has anyone tried it or know immediately why it wouldn`t
   work?

A little more division would be nicer. The limit is set by the op amp
input voltage (diff/common mode) limits. Assume this is 15V, a common
number, and phone line voltages can be about 250 - 300V, a good 
division would be 22M / 1M. You could use a JFET input opamp like
the LF347 to avoid loading down the divider. 

/ Jon Sreekanth

Assabet Valley Microsystems, Inc.           |  Fax and PC products
5 Walden St #3, Cambridge, MA 02140         |  (617) 876-8019
jon_sree@world.std.com                      |
Newsgroups: sci.electronics
From: srfergu@rufus.erenj.com (Scott Ferguson)
Subject: Re: RF leakage from TV cable system
Organization: Exxon Research & Engineering Co.
Date: Mon, 9 Nov 1992 14:34:26 GMT

In article <1992Nov9.034219.29018@athena.cs.uga.edu>, mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
|> 
|> It causes interference to other radio services.  Remember that "cable
|> channels," unlike real TV channels, are not allocated for TV usage outside
|> the cable.  For example, 155 MHz is in the middle of a cable TV channel,
|> but is allocated to police radios.  So if the cable signal escapes from
|> the cable, the police can't hear each other.  Similar things happen to
|> aviation radios, hams, etc., depending on the frequency.

|> Also, any cable leak that lets a signal leak _out_ will also let signals
|> leak _in_, so that someone viewing TV suddenly hears the police or the
|> fire department on top of his TV program...
|> 

I live next to a Hospital, and am frequently getting interference (I think
from the hospital- ambulances, etc) on Cable channel 21. The best part
is, Channel 21 is the weather channel, and the interference only comes at
the time when my local forecast is telling me something useful. As soon
as the transmission stops, I can see which cold front from Manitoba is
going through North Dakota.

Could leakage in my own house be letting that interference in? If not, I
guess I oughta call the cable company and demand they fix it somewhere, but
then I'd cause a lot of people with splitters, descramblers, etc to get caught,
huh? 
-- 
----------------------------------------------------------------------
Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      New Jersey
----------------------------------------------------------------------
"Always bark at a dog."
Newsgroups: sci.electronics
From: daniel r. mauch <daniel@halcyon.com>
Subject: Magnetic Swipe Reader Decoders
Originator: bbs@halcyon.com
Keywords: Magnetic, Swipe, decoders
Organization: The 23:00 News and Mail Service
Date: Sat, 7 Nov 1992 18:01:07 GMT

                               Magnetic Card Swipe Reader

     Some time ago there were several posts about Magnetic Card

Readers and how to read the data. One of the files even had a C

program called Swipe.C that would read  the data when a card was

pushed thought the reader and could be displayed on screen or

saved to a file.

     A few weeks ago, I bought a SR&D mag card swipe reader in

San Diego for $2.50. Using the information in the files posts

dating back to Jan 92 , I was able to connect my swipe reader to

my PC and using the program could read and store the contents of

the card. The problem was that the data was a columnar listing of

255's and 191's. I have deduced that the 255 is FF hex or 1111

1111. The 191 is BF hex or 1011 1111. Since I am not a

experienced programmer, I need some help in determining how to

read the data. I want to decode a card so that I can use a mag

card reader as an input device for a future robotics devise that

I have in mine. Any help would be appreciated.

 Here is the partial listing that is giving me trouble. To

conserve space I list the data in several columns.

255       255       255       255       etc.

255       255       255       255

255       255       255       255

255       255       255       255

255       255       255       191

255       255       255       191

255       255       255       191

255       255       255       255

255       255       255       255

255       255       255       191

255       255       255       191

255       255       255       255