HDTenEightyP/NetNews huggingface dataset:
From: regmad@gsusgi2.gsu.edu (Michael de Kraker)
Subject: Re: [* Vision System *]
Organization: Georgia State University
Date: Fri, 18 Dec 1992 00:00:07 GMT

baden@inqmind.bison.mb.ca (Baden de Bari) writes:


> 
>        Hi there... I was wondering what king of 'visual screens' would 
>be suitable for a vr vision system (and somewhat inexpensive!).  I was 
>thinking of using the lcd display screens found in portable/pocket-sized 
>television sets.
>        If anyone has any suggestions, please reply publicly...
> 
>                Thanks!
>        >>Baden<<


i	I always thought that Video-CAM viewfinders would be 
	great for and inexpensive VR system. As for a source
	call around to various repair shops and see what you can come
	up with...

	Another idea is what I recall as being called MICRO-EYE. It was
	basically a strap on your head monitor which you could
	hook up to your PC. I will look for the details if I 
	still have the original flyer.

	VR is practically here. 

 
     _______  ______
    /        /        /       /    Michael A. de Kraker
   /        /______  /       /     Georgia State University  404-651-2390
  /    ___        / /       /      Internet:REGMAD@GSUSGI2.GSU.EDU
 /_______/ ______/ /_______/       BITNET  :REGMAD@GSUVM1  PACKET:KD4FKW@W4QO
 
   To iterate is human, to recurse devine
 
Newsgroups: sci.electronics,alt.cyberpunk
From: ketil@edb.tih.no (Ketil Albertsen,TIH)
Subject: Re: Caller ID block?
Organization: T I H / T I S I P 
Posting-Front-End: Winix Conference v 92.05.15  1.20 (running under MS-Windows)
Date: Thu, 17 Dec 1992 09:12:42 GMT

In article <1992Dec16.161901.24782@krfiny.uucp>, jeffj@krfiny.uucp (J. Jonas) writes:

>No, the source of the information is the switch generating the
>SS7 commands.  As a subscriber, you cannot directly control the messages.
>The days of in band signalling are over.

Depends on how direct is "direct". In an ISDN phone, the SETUP message
is generated by subscriber equipment (e.g. a PC), optionally containing
a "calling party number" information element (and a similar subaddress
info element). The 'screening indicator' field of this info element
may take the values 'User-provided, not screened', 'User-priovided,
verified and passed', 'User-provided, verified and failed' or 'Network
provided' (Q.931, section 4.5.10, table 4-10). The Setup message is
certainly carried by SS7 across the net.

If unique caller IDs are to be transmitted for each individual phone 
connected to a PABX (which by definition is subscriber equipment),
there is no other way to do it than having the phone itself or the
PABX supply the ID to the network.

>> Since your phone can transmit to the other line before the phone is
>> picked up, it should be quite easy to implement this.
>
>On what equipment is this allowed?  Certainly no ESS or crossbar that's
>commonly used around here.

On all ISDN phones, and through all switches supporting ISDN. (But I 
agree that it ISDN phones are not "commonly used"!)
From: shoppa@almach.caltech.edu (TIM SHOPPA)
Newsgroups: sci.electronics
Subject: Toroid 60Hz power transformer source?
Date: 15 Dec 1992 16:35 PST
Organization: California Institute of Technology
Distribution: world
NNTP-Posting-Host: almach.caltech.edu
News-Software: VAX/VMS VNEWS 1.41    

Hello,
	I have been building some low-level audio circuitry, and have had
problems with hum from nearby AC transformers.  Currently, I have the power
supply located a great distance away from my circuitry in order to eliminate
the hum.  The sort of transformer I need is 120VAC to around 20 VAC
center-tapped, at a few V-A's. As I understand, Toroid transformers can have a
much smaller radiated EM field than usual transformers. 
	There are several manufacturers of toroidal power transformers,
but they all seem to want an arm and a leg ($50+) for even the smallest
transformers.  Does anyone know of a more inexpensive source for these?
Alternatively, is winding my own toroidal transformer out of the question?
I have wound several RF toroidal transformers, but I imagine that a totally
different core material would be used in a 60 Hz transformer, and saturation
of the core would be a big concern.  Do any toroidal core manufacturers
give information on using their cores in 60 Hz transformers?  I'm looking
for the sort of information Amidon gives on their cores - sort of a cookbook
procedure on how to make your own transformer.

						Thanks (in advance),
						Tim (Shoppa@erin.caltech.edu)
From: jpexg@gaak.LCS.MIT.EDU (John Purbrick)
Newsgroups: sci.electronics
Subject: Voltage regulators in parallel?
Date: 17 Dec 1992 00:10:02 -0600
Organization: UTexas Mail-to-News Gateway
NNTP-Posting-Host: cs.utexas.edu


I want to set up a power supply delivering more current than an integrated
voltage regulator (LM78xx if fixed, or LM317 if variable) will provide. It
seems valid to parallel as many of the relevant component as I need to get
the current; certainly they won't all pass the same current, and the voltage
out will drop if the initially-highest regulator starts to overload, but it
should settle to some lower voltage as other regulators start to conduct 
more. It seems that this would apply whether the overload was caused by 
overcurrent or overheating. And when all the regulators are conducting, the 
output should be no lower than the lowest output would have been if they were 
wired individually.

Is there a flaw here? I can't find a reason why it won't work, but something
about it doesn't feel right.

John Purbrick
jpexg@lcs.mit.edu



Newsgroups: sci.electronics
From: rfc@allegra.att.com (Robert F. Casey)
Subject: Re: "The Glob" Atari 2600 processors ???
Organization: AT&T Bell Laboratories, Murray Hill, NJ
Date: Thu, 17 Dec 1992 17:47:58 GMT

The glob on the board is probably the actual IC silicon die wire
bonded to the circuit board traces.  The black glob is just some
epoxy dripped on it to protect the chip and bonding wires from the
air and dust and such.  They skipped the IC packaging and soldering
steps making this module.  To cut cost.
Newsgroups: sci.electronics
From: eric@giga.mks.com (Eric Gisin)
Subject: Re: charging question
Organization: Mortice Kern Systems Inc., Waterloo, Ontario, CANADA
Date: Fri, 18 Dec 1992 20:15:38 GMT

In article <BzEqn6.JMv@cck.coventry.ac.uk> lsg001@cck.coventry.ac.uk (Graham Wilson) writes:

>  If you have a bank of 12 volt batteries of 500 amp capacity, what is the 
   highest amp hour charge you can put into the batteries without cooking
   them ?

>  Is there are a formula for working this out ?

I assume they are deep cycle lead acid,
and that you mean 500 amp-hour, not 500 amps.

Let C be the amp-hour rating (500 in your case).
You can charge it at C/20 amps (25 amps in your case) until fully charged,
which will take more than 20 hours.
You can also charge it C/10 amps until 90% charged,
then do the last 10% at C/20 amps.
You have to stop when fully charged (check V or S.G.).
You want to prevent gasing, which damages the battery.

Note that simple automotive chargers do not charge at constant current,
which these methods require. A 20 amp charger will only supply 20 amps
to a dead battery, and gradually decrease to a few amps when fully charged.
Alternators with a voltage regular are similar,
although a 50 alternator does not charge at 50 amps!

I read this in "The Complete Battery Book".
Xref: sparky sci.electronics:20898 comp.sys.laptops:4707 misc.consumers:20766
From: dwu@gnu.ai.mit.edu (Daniel Wu)
Newsgroups: sci.electronics,comp.sys.laptops,misc.consumers
Subject: Where to find spare nicd batteries?
Date: 16 Dec 92 23:20:22 GMT
Followup-To: comp.sys.laptops
Distribution: usa
Organization: Free Software Foundation

I'd like to build a spare battery pack for my notebook PC.  The battery pack
for my Jetbook consists of 4 D-sized batteries in ashrink-wrap tube.
It says Sanyo Cadnica Model 4KR-5000DEL:

	4.8V	5000mAh

I went to Radio Shack to look for extra cells, but their nickel cadmium
batteries just go up to 4000mAh.  Likewise Digikey only stocks cells up
to 4000mAH as well.  Can anyone tell me where I can find 5000mAh batteries?

Are there any other alternatice that I can use: Nickel Hydride batteries of
comparable capacity, > 5000m Ah nciads?

Thanks for any pointers,

Daniel
dwu@spiff.gnu.ai.mit.edu
From: z_johnsta@ccsvax.sfasu.edu
Newsgroups: sci.electronics
Subject: Iron-On PCB transfers
Date: 18 Dec 92 16:43:25 CST
Organization: Stephen F. Austin State University

I posted a message similar to this one, but somehow the subject got skewed, and
knowing how fast this newsgroup goes, I know most people just skip all of the
extraneous stuff, so here goes again...


Does anyone know of a source of Iron-on transfers for etching PC boards that I
can just print on with a laser printer and Iron on the PC board and etch?

I know they exist, and many thanks to the person who sent me the reply on the
other post.  Please respond via Email as I miss a very large number of the
posts on this newsgroup.

Thanks in advance!



                                    -Tim

"And I am here to eat the food!" -- Muppet Rat
 

-------------------------------------------------------------------------------
:  Timothy A. Johns                 Z_JohnsTA@ccsvax.sfasu.edu                :
:  P.O. Box 16050 S.F.A.            Physics/Computer Science Undergraduate    :
:  Nacogdoches, TX  75962           Stephen F. Austin State University        :
:  Hm: (409) 560-1876               Wk: S.F.A. Planetarium (409) 568-3009     :
-------------------------------------------------------------------------------
Newsgroups: sci.electronics
From: dvsg0223@uxa.cso.uiuc.edu (David Salamon)
Subject: Re: Can Cable TV Descramblers really be detec from outside ???
Organization: University of Illinois at Urbana
Date: Mon, 21 Dec 1992 06:30:37 GMT

dbak@elm.lle.rochester.edu (Douglas Baker) writes:

>In our local paper there has been talk of detecting Il-legal cable TV
>descrablers from outside the home.  I can think of two possible ways
>this can be done but there may be others.

I suspect that it is simpler than this.  Most people who have "illegal" cable
descramblers are buying a complete unit by mail order that is essentially 
the same one used locally.  The only difference is that the mail order unit
is configured to descramble everything.

Since most of the fancy commercial descramblers are remotely configurable
or something like that, the cable company can probably send a "request ID"
signal to all lines and see which boxes answer with a configuration that does
not match what the subscriber pays for.

David

--------------------------------------------------------------
David Salamon                Physics Graduate Student (Slave)
d-salamon@uiuc.edu           University of Illinois
--------------------------------------------------------------
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: Flywheel batteries as EV power source
Date: 16 Dec 1992 14:26:18 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <Ligon-161292082905@3.1.100.11> Ligon@macgw1.ge.com (Woody Ligon) writes:
>
>This posting is fast turning into a stream of consciousness but it also
>seems to be saying that flywheel storage cannot possibly be as simple as it
>is being portrayed. 

That goes without saying.  Nothing is ever as simple as the marketing folks
would have you believe.
--scott
Xref: sparky sci.electronics:20623 rec.audio:16605 alt.guitar:10822 rec.music.makers.guitar:892
From: rg@kunikpok.UUCP (R.G. Keen)
Newsgroups: sci.electronics,rec.audio,alt.guitar,rec.music.makers.guitar
Subject: Re: Tube amp transformers
Date: 13 Dec 92 14:07:38 GMT
Article-I.D.: kunikpok.F45PVB1w165w
Organization: Kunikpok Kennels and Komputers (Pet Project)

> While we are on this subject:
> I have an old Heathkit W4-B tube amplifier with a blown output transformer.
> Anybody got a spare in their junk-box (or know what its specifications 
> should be)?
> 
> Thanks,
> george@alpha.ee.ufl.edu

Further while we are on this subject: I'd like to try my hand at winding 
an output transformer. I have some experience from my power supply design 
days, but haven't done an output transformer yet. Anybody got DEAD 
outputs I could dewind to research how they are made?

R.G.
Newsgroups: sci.electronics
Subject: Microcontroller Magazines
From: <DI3QC@CUNYVM.BITNET>
Date: Wednesday, 16 Dec 1992 00:09:35 EST
Organization: City University of New York/ University Computer Center

     Could anyone out in NetLand direct me to publications that focus on micro-
controller projects and applications. I have read the past posts of ranking
electronic mags. but I havent seen any info such as addresses or numbers to
get in contact with ComputerCraft. Thats one I have heard good things about
but I havent seen it at magazine racks. If someone could send me the address
for ComputerCraft I would be grateful. Thanks again.

                                                      Happy Holidays,
                                                      Alex Jeannopoulos
Newsgroups: sci.electronics
From: mellob@cary103.its.rpi.edu (Brett A. Mellor)
Subject: Barking
Reply-To: mellob@rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy, NY.
Date: Mon, 14 Dec 1992 16:40:59 GMT

  My Dog Bark Inhibitor of choice has always been an air rifle.

	However, as John Fox stated, their is a device you can build or

	buy the kit for. The latest issue of either Popular Electronics or

	Radio Electronics/Electronics Now (two of my favorites, was that this 

	group?) did an article on it. But which ever it was, the other always

	runs the same stuff 1 or 2 months later.

				-Brett

 Dear Mr. Fox, Why are the SunStations so much slower than the IBM AIX 
		terminals?
From: jmce+@andrew.cmu.edu (James Ryan Miller)
Newsgroups: sci.electronics
Subject: Re: Shareware/freeware PCB/schematic-capture programs FTP-able?
Date: 10 Dec 92 22:15:11 GMT
Article-I.D.: andrew.gf_4sDW00iV4M8Vp9a
Organization: Freshman, CIT general, Carnegie Mellon, Pittsburgh, PA


    Yeah, I got the PADS stuff off wuarchive.wustl.edu.  It was in
mirror2/msdos/cad.  Unfortunatly, the installation program that comes
with it crashes on everyone's computer I've seen try it.  Basically, you
have to install everything manualy.  If you have any questions with
this, just send me mail.  

        Ryan Miller
        jmce@andrew.cmu.edu
Newsgroups: sci.electronics
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Subject: Re: Flywheel batteries as EV power source
News-Software: VAX/VMS VNEWS 1.41    
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
Date: Tue, 15 Dec 1992 19:35:00 GMT

In article <1992Dec15.004956.465@mtu.edu>, cmwolf@mtu.edu (christopher m. wolf) writes...
>jeh@cmkrnl.com writes:
>The same flywheels are referenced in the last IEEE.  They are low mass, very 
>high speed devices.  The low mass does not obstruct cornering, while the
>high speed and low diameter helps them to store more power.  They supposedly
>should take about 10 minutes to fully "charge", given a large enough (not
>impossible) power source, although usually not available in the normal home.
>They should be made of a composite fiber material, so if they should break 
>apart, they will basically turn into something resembling cotton, instead of
>destroying everything around it.  Several of these would be needed.  The 
>magnetic bearings would supposedly allow them to spin for months if not
>being used.
> 
	What do they do about precession? I remember that being a problem, and
	precession effects would still be proportional to the amount of energy
	stored. (Love a car that works great in Kansas but goes bananas in San
	Francisco.)

   Frank R. Borger - Physicist    __       Internet:  Frank@rover.uchicago.edu
Michael Reese - Univ. of Chicago |___      Phone : 312-791-8075 fax : 567-7455
  Center for Radiation Therapy   | |_) _   
                                   | \|_)  Faith is believing what you know
    "Birthplace of Softball"          |_)  ain't so. - Mark Twain
Newsgroups: sci.electronics
From: wa2sff@cbnewsh.cb.att.com (joseph.e.wilkes)
Subject: Cellular base station data receiver ICs wanted
Organization: AT&T
Date: Thu, 17 Dec 1992 13:37:21 GMT

I have some ideas for cellular test equipment but need to
decode the data messages from a cellular telephone.
Does anyone know of any ICs to implement a base station data receiver?

Signetics makes the UMF1000T (Data processor for Cellular radio) that
is used in a portable cellular telephone.  Can that chip be tricked
into acting as a base station receiver?

Calls to Motorola resulted in either: what is cellular or we only make
the chips for our own development.

I know that Curtis makes a cellular test set.  Has anyone taken it apart?
It's too expensive to purchase just to disassemble.

Joe Wilkes
cbnewsh!wa2sff
908-949-1601

Newsgroups: sci.electronics
From: tpappas@hamp.hampshire.edu
Subject: ICM 7049 ?????????
Organization: Hampshire College
Date: Fri, 18 Dec 1992 15:43:05 GMT

Hello Sci.Electronics Users.
I am hoping some one out here can help me out with a chip problem.
Intersil division of Harris used to have a chip called the ICM 7049.
They don't manufacture it any more. Who does make a similar chip?
The chip uses a 4.19...Mhz crystal and give a pulse out every second
with high precision.
						Thanks Much!
						Tom Pappas
From: v064mb9k@ubvmsd.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Switching speakers on during loud volumes
Date: 13 Dec 92 05:45:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 I am designing a device that disconnects a pair of speakers from a
stereo recevier when the phone rings. But when the phone is eventually
hung up m afraid that suddenly switching back a pair of speakers with a
relay during high volumes can sort of "overwhelm" a pair of
sepakers and could in fact in the long run cause damage or destroy
them especially the woofer. Can someone confirm this. I would appreciate
any help. Thanks


	Neil Gandler
Newsgroups: sci.electronics,comp.robotics
From: cs911225@ariel.yorku.ca (KEN E WILLMOTT)
Subject: Re: Infrared remote controls
Keywords: infrared HC11
Organization: York University, Toronto, Canada
Date: Wed, 16 Dec 1992 16:18:55 GMT

I tried deciphering the IR remote control signals as well, by
connecting a surplus receiver to one of my HC11's input capture pins.
Software stored timer values in  a list, producing the effect of
a digital oscilliscope.

Trusty calculator in hand, I then puzzled for several days over
the printouts. I found several "layers" of encoding as I went along.
I never did reach a point where I felt I knew enough to produce
an ad hoc data sheet, but I did learn more than is in the "zapper"
documentation.

My latest project, which is on a back burner due to schoolwork,
is the transmit portion. The hardware part has been prototyped, and
uses a PLL frequency multiplier which is locked to a reference
squarewave from the HC11.

Having a dedicated realtime processor with the I/O features of
the HC11 was enormously helpful, toward this end.

	-Ken
From: helho@ecst.csuchico.edu (Weird!!)
Newsgroups: sci.electronics
Subject: Information about CODEC ...
Date: 16 Dec 92 23:42:05 GMT
Distribution: usa
Organization: California State University, Chico
NNTP-Posting-Host: cscihp.ecst.csuchico.edu

Hi,

 Would someone tell me what is a CODEC chip? I guess the chip may
 has a antialiasing filter, D/A & A/D converter built-in. But I am not
 sure where I could find the chip and how much it is. 
 I would appreciate if anyone could give some information about how
 to operate the chip and where to get it...

 Thanx in Advance..

							 Kenneth
Newsgroups: sci.electronics
From: iqbal@kaw.eel.ufl.edu (M.Iqbal)
Subject: Re: Ranking the Electronic magazines.
Organization: University of Florida
Date: Tue, 15 Dec 92 22:36:05 GMT

In article <1992Dec13.014432.1@ulkyvx.louisville.edu>, jhwhit01@ulkyvx.louisville.edu writes:
|> In article <sehari.724185381@class1.iastate.edu>, sehari@iastate.edu (Babak Sehari) writes:
|> > ---
|> > 
|> > I have red many electronics magazines.  I found each has some advantages
|> > and some short comings.  Here I would like to post it here.  I hope others
|> > also share their thoughts about their electronics magazines:
|>  
|> One that has been recommended to me, but I have not seen it, is ComputerCraft.
|> It is called "the practical magazine for personal computers & microcontrollers."
|> It was formerly a hobbiest electronics magazine called "Modern Electronics."
|> Maybe someone here will be able to give us a better description.
|>  
|> Jeff White    jhwhit01@ulkyvx.bitnet

I am a regular subscriber of ComputerCraft. Quite honestly, it did not
impress much. Basically, the magazine gives two to three simple circuits
diagram and discuss the performace without going into detail analysis. Very
little mathimatical explanation and the circuits they put in the magazine
are usually available as kits which the author name at the end of the artical.

Sometime, the magazine run bigger circuits in several issues, but again
with very little explanation of the theory and math. 

ComputerCraft talks mostly about intel microcontroller. Sometime, an 
artical or two show up on 68HC11. Otherwise, the magazine talks about
Zilog microcontroller if not intel micontroller.

My subscription is expiring and I do not plan to renew it.

-- 

---------------------------------------------------------------------------
"If your annual income today is $50,000, you have the same buying power as
the average coal miner did in 1949, adjusted for taxes and inflation," John
Sestina, nationally recognized Certified Financial Planner;  quoted in 1987.
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---

Newsgroups: sci.electronics
From: ardai@zax.eda.teradyne.com (Michael Ardai)
Subject: Re: Ranking the Electronic magazines.
Organization: Teradyne, Inc. Boston MA
Date: Mon, 14 Dec 1992 18:26:49 GMT

In article <1992Dec14.055523.14417@athena.cs.uga.edu> mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
-Computer Craft today is what Byte was in the 1970s -- the computer
-_tinkerer's_ magazine.  It concentrates on fairly easy-to-build
-interfacing gadgets and beginner-level microcontroller projects.
-It's a good magazine and occupies a niche that no other magazine does;
-it has no direct competition in the USA.

Unfortunately, most of the interesting projects are from Nick Goss aka
US Cyberlab.  I have tried (many times) to get a catalog from them, and 
it has never shown up.  If they can't send out a catalog to a prospective
customer (and I was planning to by about 30 kits for a kit-building
workshop with the Boston Amateur Radio Club), I won't send them any
money...

/mike
-- 
\|/  Michael L. Ardai  N1IST   Teradyne EDA 
--- -------------------------------------------------------------------------
/|\  ardai@maven.dnet.teradyne.com
Xref: sparky sci.electronics:21264 soc.culture.japan:12677