HDTenEightyP/NetNews huggingface dataset:
From: carlr@netcom.com (Carl Robinson)
Subject: Re: Airport X-Rays
Date: Mon, 27 Jul 92 03:48:21 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
X-Newsreader: Tin 1.1 PL4

X-rays shouldn't bother magnetic devices (hard disks,diskettes, etc.).
Magnetic scanners will like those hand-held scanners airport security
personnel use when you set off the alarm.  The thingy you walk through
is also magnetic and will hose disks.  X-rays will wipe out unexposed
and unprocessed film. 
-- 
Carl Robinson                   carlr@netcom.com
Voice:  (510) 685-4983          Fax:  (510) 825-5290
From: bender@oobleck (Duke of Canterbury)
Newsgroups: sci.electronics
Subject: Aeroplane Seat Boxes for entertainment (was Re: SHOCKING STORIES)
Date: 28 Jul 92 07:45:21 GMT
Reply-To: bender@oobleck.eng.sun.com
Organization: SPARK's R US
NNTP-Posting-Host: oobleck
X-Newsreader: Tin 1.1 PL3

>Another time I was working as a repair tech on seat boxes (the gizmos under
>your airplane seat that pipe music to you [...]

Can give some more detail on how these work?  Do the planes have one large
multitrack tape for all of the entertainment channels?

--
The IQ requirement for being a phone operator may be pretty low, but the
required IQ for placing a call is just about vegetable level.  That's why
they kill sardines before canning them; if you let them swim around in the
can, it would heat up and explode.
Newsgroups: sci.electronics
From: betsy@rainbow.uchicago.edu (Betsy Weatherhead)
Subject: uv watch
Organization: University of Chicago
Date: Fri, 24 Jul 1992 18:09:29 GMT


I'm sure I'm not crazy.  About four or five years ago I saw a 
watch for sale that measured uv radiation--or so it claimed.
I told some friends in the field this and was told I was
crazy.  Does anyone know anything about this watch?  Does
anyone have one?  Who is the manufacturer?  Are they still
available?

I have tried on my own to trace this down.  I've gone to the
consumer electronic show here in Chicago, and got a major
run around.  I've checked with several local stores to no
avail.  Any recollections of this watch will help me.


-- 
                              O             betsy@rainbow.uchicago.edu
_          __                  \            
  \      /    \       -- >      O           E. C. Weatherhead
   \ __ /      \ __ /          /            5734 S. Ellis  Chicago, 60637
From: rwb@boxcar.VI.RI.CMU.EDU (Robert Berger)
Newsgroups: sci.electronics
Subject: Source of rotary transformers
Date: 29 Jul 92 04:56:51 GMT
Organization: School of Computer Science, Carnegie Mellon

Does anyone know of a company that makes rotary transformers that can
be used to transmit power and signals to a spinning assembly?
Organization: Queen's University at Kingston
Date: Thursday, 23 Jul 1992 21:34:51 EDT
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: Are there any large PALs/GALs?

In article <jeremym.711852401@sfu.ca>, jeremym@fraser.sfu.ca (Jeremy Thomas
McDonald) says:
>
>I was wondering if there are any PALs/GALs that have a large number of D
>flipflops.  I need to implement two 12-bit counters and a 15-state FSM and and
>8-bit register.  I also need three 8-bit I/O ports.  I want to design a
>controller to act as a pseudo-Dual port RAM controller, with a high speed
>20n s RAM chip (single ported) attached to one of the ports on the PAL/GAL,
>and the PAL/GAL acting as a time slicer for the RAM.  One port on the PAL is
read-only, the other is write-only.

There are the Lattice GAL26V12 with 12 macro cells and runs at 10ns,
and the smaller 18V10 and 20V10.  I don't know about availability and
price.  AMD seems to have fast 7ns GAL chips.  I would have recommended
larger PLD's like iPLD 910 and 85C090 which has 24 macrocells, but they
might be slower than the GALs.

Lattice also have the new pLSI & ispLSI (Programmable and In-
System Programmable Large Scale Intergration).  They are PLD devices with  96
registers - 288 registers and 44 to 120 I/O pins.  They runs at 70-80 MHz.
These are pretty new chips.  I think the price is about $100 a piece at 100
quantity. There is an Engineering kit @ $395 which includes a Univeral
programmer module + a 84-pin PLCC adaptor + ispLSI 1032 sample.
(ispLSI 1032 - 192 registers, 64 I/O pins)

For more info call Lattice at 1-800-327-8425 ask for info packet# 309.
(BTW that's 1-800-FASTGAL which they didn't mentioned in their ad.)

>Any help in this area would be much appreciated, as going with external
>MSI logic eats up tons of board space.  Thanks.

Another way of implementing what you are doing is to use a FAST FIFO
chip.  The fastest ones I seen the ads for are at 7ns.  Slower ones
are also available. :)   Sharp & Integrated Device Technology make
these.

>e-mail to: jeremym@fraser.sfu.ca

K. C. Lee
Elec. Eng. Grad. Student
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Differentiating a 2716 and 2764
Date: 23 Jul 92 06:10:16 GMT
Organization: U of Wisconsin-Madison College of Engineering


Hi,

I'd like to know how an EPROM programmer can go about differentiating between
having a 2716 and 2764 inserted into it.  The only thing I can think of
off hand is this:  Since in the "waiting" state no power is applied to the
EPROM, the programmer chould connect a high resistance to Vcc of a 2716.
Now, it checks the voltage at Vcc right before going into programming mode,
where full power is made availiable to Vcc.  If it finds a voltage less than
the voltage bus connected to the resistor, it decides that a 2716 is
inserted -- the power consumption of the 2716 acts as a voltage divider with
the first resistor.  If the voltage is the bus voltage, it's a 2764 since
Vcc on a 2716 maps to an unconnected pin on a 2764.  Although this sounds
complex, I can see that it's really not that hard in hardware.

So... that's my method.  Does anyone else have a good method to do this?
Thanks!

						---Joel Kolstad
Xref: sparky sci.electronics:13513 rec.audio:10964 alt.folklore.computers:11328
From: jeh@cmkrnl.com
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 28 Jul 92 18:43:19 GMT
Organization: Kernel Mode Consulting, San Diego, CA

In article <1992Jul27.092328.21478@discus.technion.ac.il>, sorin@techunix.technion.ac.il (Goldenberg Sorin) writes:
> Somehow the cd manufacturers seem to squeeze more music into the c.d.
> I have Mahler 2.nd with Klemperer - above 79 min.

This is done by playing fast and loose with the CD specs, particularly those
for track pitch (track-to-track spacing).  It is not recommended and such disks
are more likely than standard disks to have tracking problems in players that
are also a little bit out of spec. 

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
Newsgroups: sci.electronics,sci.materials,sci.physics,sci.engr.chem
From: woyansky@ginny.ece.cmu.edu (George J. Woyansky)
Subject: Re: PZT Excitation
Organization: Electrical and Computer Engineering, Carnegie Mellon
Distribution: na
Date: Mon, 27 Jul 1992 20:31:25 GMT

In article <24938@dog.ee.lbl.gov> sichase@csa2.lbl.gov writes:
>In article <1992Jul27.185909.19949@pbhyg.PacBell.COM>, rhsomer@pbhyg.PacBell.COM (Bob Somers) writes...
>> Is there any material that acts as an insulator
>>from magnetic forces?  I was told some time ago
>>that there is none, but perhaps some new material
>>will do this.
>>	Bob Somers, Pacific Bell, 510-823-9010
>
>I'm becoming surprised at how often this question gets asked.  An alloy
>called Mu-Metal has very high "mu" and so can provide good magnetic
>shielding in many situations.  It is expensive and somewhat fragile - 
>it can't take alot of banging or extended vibration before the large
>magnetic domains get shattered, ruining its shielding ability.

[remainder deleted]

We too used Mu-metal for magnetic shielding (when I used to work in the real
world).  We surrounded a photomultiplier tube (end-on) with mu-metal and saw 
a VERY significant drop in the magnetic susceptibility of the tube.  However,
as mentioned, it doesn't tolerate a lot of metal-forming type processes...

George Woyansky
Doctoral Student, Electrical and Computer Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
From: simmon@eeel.nist.gov (Eric Simmon)
Newsgroups: sci.electronics
Subject: AC Adapters and charging nicads
Date: 24 Jul 92 14:57:01 GMT

I have a panasonic SL-NP1A portable CD player.  I would
like to use rechargeable batteries with it.  Panasonic would
like me to use their battery packs (which cost $$$).  I am
trying to use regular AA nicads instead.  I believe the battery
packs have a current limiting resistor in them in addition
to the batteries.  To determine the value of the resistor I measured
the  output of the AC adapter and was suprised to find out the
voltage is 5.35v (the adapter itself reads 3v).  Does anybody
know why this is?  Also will just installing a resistor
(between the batteries and the charging connection in the battery
holder) work?  Any information will be helpful!


Thanks,

Eric Simmon

simmon@eeel.nist.gov
Newsgroups: sci.electronics
From: rudi@igc.ethz.ch (Rudi V. Drunen Groningen)
Subject: Re: Questions about GAL .JED download file
Organization: Computational Chemistry, ETH, Zuerich
Date: Wed, 22 Jul 1992 12:54:37 GMT

In article <92203.170353LEEK@QUCDN.QueensU.CA>, LEEK@QUCDN.QueensU.CA writes:
 > I am in the process of building a GAL programmer from programming
 > specs I got from National Semiconductor.
 > 
 > (Unfortunately that's under non-disclosure, so I can't give the specs out.
 > Just in case someone asks.  It is a shame that the GAL manufacturers don't
 > make their programming specs available to the public.)
 > 

That's the very same thought as I have on GAL manufacturers, WHY don't they
give out their programming specs ?. It's common practice that the EPROM 
manufacturers add their programming specs to the data sheet. 
I REALLY DO NOT UNDERSTAND why those chip-mfgrs make these specs a secret.
I think anyone should be able to get those specs for building his / her 
programmer. You pay for the part, so you should be able to get all the data
on it as well (that's where you pay for !).

There are a number of 2nd sources of gals, so LATTICE doesn't have to keep
the specs a secret i think. Also, there are a lot of programmers on the market
built on vague assumptions of programming specs, which is a NO GOOD THING !

SO WHY DO YOU MFGRs KEEP YOUR PROGRAMMING SPECS A SECRET ??
please is there anyone who can explain this ?

Rudi.

Rudi van Drunen 
Electronics design Engineer, University of Groningen, The Netherlands.
(rudi@igc.ethz.ch)
From: chbl@sbustd.rz.uni-sb.de (Christian Blum)
Newsgroups: sci.electronics
Subject: Re: Radar Detectors, and Radar Detector Detectors
Date: 27 Jul 92 13:16:50 GMT
Organization: Studenten-Mail, Rechenzentrum Universitaet des Saarlandes

In Germany, the police also uses inductor loops and infrared to detect a
car's speed... dunno what to do against this one! How about driving at
a proper speed? ;-)

Chris.
From: dbushong@wang.com (Dave Bushong)
Newsgroups: sci.electronics
Subject: Re: FM subcarrier encryption
Date: 29 Jul 92 19:31:20 GMT
Organization: Wang Labs, Lowell MA, USA

klp@doe.carleton.ca (Ka Lun Pang) writes:

>Hi folks,

>A friend of mine in Toronto told me about that foreign language radio stations
>in that city use some sort of "FM subcarrier" for broadcasting. The signal
>has to be received by special made radio sold by the stations.

>Does anyone have more detail on this kind of operation?
>Maybe someone in Toronto can tell me more about the technical side of this
>story.

Look for information on something called "SCA".  It's usually the
stuff that people call "elevator music."

Dave
-- 
==========================================================================
Dave Bushong, KZ1O@K1UGM.MA         +    No .sig, no tattoo, 
Wang Laboratories, Inc.             +        no bald spot, no nothin!!
Internet: dbushong@wang.com         +-------------------------------------
Project leader, OCR Products        + (reserved for future expansion)
From: grant.ranson@outlan.ersys.edmonton.ab.ca (Grant Ranson)
Newsgroups: sci.electronics
Subject: Re: hex display
Date: 30 Jul 92 17:13:00 GMT
Reply-To: grant.ranson@outlan.ersys.edmonton.ab.ca (Grant Ranson)
Organization: Outland BBS-UUCP

TO:ALL 
FROM:grant.ranson@outlan.ersys.edmonton.ab.ca 
 
(I sent this message on July 28th, 1992, but it looks like my
off-line reader nuked the last couple of sentences.  Sorry for any
confusion.  Here we go again:)  Grant.
 
A further suggestion, regarding the hex display question
mentioned  below: 
 >  
 > In article <55066@mentor.cc.purdue.edu>
 >] falatic@mentor.cc.purdue.edu (MacGyver) writes:  Hi! I am
 >] looking  for a chip to convert BCD (actually, straight 4 bit
 >] binary) to  Hexadecimal (A-F). I need something LIKE a 7447
 >] driver, but that   one does not   treat 10d-15d the way I need.
 >] Anyone who can help,  please reply thru E-Mail if possible, or
 >] post here.
 >  
 > How's your budget? :-)    The IDEAL part is the HTIL311 display
 > from Texas Instruments. Inside the packeage are: a four bit
 > latch  (tristate), BCD to display converter, LED drivers, and a 5
 > X 7  matrix of LEDs. Apply BCD data to the input pins, pulse the
 > DV (  data valid ) pin, and presto,  hex code shows up on the
 > display.  
 > I'm using these in a DTMF project I'm working on. Unfortunatly
 > the  last time I dared to ask they cost about $13 each, but still
 > a cool  part. 
 > John
 >  
 You might want to try programming a small EPROM (2708-style) with a
 table containing segment pattern info for each of the 16 possible
 inputs.  Connect the incoming data to a0..a3 of the 2708, and feed
 its d0..d7 outputs to something like a 74LS244 for current drive. 
 You didn't mention how many digits you require, but it would be fairly
 easy to add mux circuitry to this design. 
 
 I realize that this suggestion is primitive compared to the fancy
 displays that John mentioned, but perhaps it will help in some way.
 
 Grant  (grant.ranson@outlan.ersys.edmonton.ab.ca) 




---
 ~ MMST 2.09 UnRegistered !Xa
Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: P-channel Mos-Power (equivalent to VN2410L, Siliconix) wanted.
Organization: The John P. Robarts Research Institute, London, Ontario
Date: Thu, 23 Jul 1992 18:44:01 GMT

I have been using a Siliconix VN2410L (also known as BS-107?),
which is an N-Channel enhancement mode mos-power transistor.
It comes in a TO-92 case.  I am activating the gate of this device
by taking the output of a 54LS154F (4 line to 16 line decoder) and
inverting it (74LS04).  The inverted output goes to the Mosfet.

I would like to eliminate the inverter, so I was wondering if anyone
out there knows of a P-channel equivalent.  The on/off switching times
of this guy is 10 ns.  Continuous current is not much (70 ma I think),
but I'm using .1 to 2 usec. on time to switch 15 to 30 volts through
a hand-wound transformer (to activate a small ultrasonic transducer).

I'm not sure if the P-channel equivalent I'm looking for will work with
TTL level signals, or if it would work with a 74LS154 instead of a 54LS154F.

E-mail or post... Thanks ahead for any ideas...

Newsgroups: sci.electronics
From: pngai@adobe.com (Phil Ngai)
Subject: Re: SHOCKING STORIES
Organization: Adobe Systems Incorporated
Date: Wed, 22 Jul 1992 20:24:06 GMT

In article <2516@uswnvg.uswnvg.com> cjackso@nv6 (Clay Jackson) writes:
>At the same high school, we had an old ASR33 teletype, complete with a HUGE
>DC power supply.  Someone also had given us a bunch of 1 FARAD 24V capacitors

I find this hard to believe.

-- 
My opinions are my own.
Newsgroups: sci.electronics
From: pegasus@csd4.csd.uwm.edu (David R Hucke)
Subject: Circuit help...
Originator: pegasus@csd4.csd.uwm.edu
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Date: Thu, 23 Jul 1992 20:53:32 GMT

Hi everybody!  Got another question.

First of all I wish to thank everybody who has given me help in the past.
Especially Tony Hefner who has been the most help.  I really appreciate
the help guys (gals).


I wish to build a circuit that sends a parallel byte every 125 us  (is that
milliseconds?) to a parallel port.  

I would like the byte to be incremented by a counter so that I can verify
that I am getting the bytes correctly.

The purpose of this circuit is to test the speed of a PC's parallel port.

Any suggestions?

====
pegasus@csd4.csd.uwm.edu

-- 
pegasus@csd4.csd.uwm.edu                David R. Hucke
                                        UW-Milwaukee Film Major
--
Newsgroups: sci.electronics
From: mjb@netcom.com (Martin Brown)
Subject: Re: Wave-like scan line prob on TV
Date: Sun, 26 Jul 92 04:12:45 GMT
Organization: Netcom - Online Communication Services (408 241-9760 guest)

In article <7480095@hpfcso.FC.HP.COM> myers@hpfcso.FC.HP.COM (Bob Myers) writes:
>> |          |
>> |          |
>>  \          \
>>  /          /
>> |__________|
>> 
>> 
>> (Hmmm... that's my best ASCII art in ages).
>> 
>> This usually means the big capacitor in the powersupply is broken.
>
>
>Maybe.  My first question would be: Is the display operating near any 
>other electrical device running at or near the line frequency?  (Such as
>an electric motor, a disc drive, or - most commonly! - another CRT?)
>
Yeah, and don't forget the magnet of the stereo speaker you put next crt
for that bitchin' sound.
>
>
>Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
>                   User Interface Tech. Div.|those of my employer or any other
>myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.


-- 

                                   - mjb -

                                mjb@netcom.com
From: ivory@e7sa.epi.syr.ge.com (John Ivory)
Newsgroups: sci.electronics
Subject: Access to Internet from home: how?
Date: 31 Jul 92 13:26:40 GMT
Reply-To: ivory@e7sa.epi.syr.ge.com
Organization: Tower Concepts




Access to Internet is invaluable to me: FTP, USENET News, TELNET logons, etc.
How can I obtain access to it from my home?  I have an excellent PC, a Sun
workstation, and numerous modems.

I'm expecting that I'll need to buy an account on some system, and will have
to modem in.  Who do I contact?  How much will this cost?  Where to I begin?
I'm in the central NY region (Utica, Syracuse) and would prefer to avoid
long distance phone charges if possible.

I'll be happy to read an FAQ on this if there is one.  I'm also just as
happy to summarize and repost the responses.  Thanks.

								John

------------------------------------------------------------------------- \ \ \ 
   Tower Concepts                                          John E. Ivory   \ \
   103 Sylvan Way                                       ivory@crd.ge.com    \ \
   New Hartford, NY  13413                     ivory@e7sa.epi.syr.ge.com     \
   (315) 724-1471                                                             \
-------------------------------------------------------------------------------
From: rwb@alexander.VI.RI.CMU.EDU (Robert Berger)
Newsgroups: sci.electronics
Subject: Re: 0.100" spacing
Date: 27 Jul 92 04:21:35 GMT
Organization: School of Computer Science, Carnegie Mellon

Sears sells a milling table for drill presses that is an X/Y slide with
cranks on each axis. I believe it has .100 movement for every rotation
of the cranks.
From: kherron@ms.uky.edu (Kenneth Herron)
Newsgroups: sci.electronics
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
Date: 29 Jul 92 02:56:57 GMT
    <27JUL199215011713@rover.uchicago.edu> 
    <1992Jul28.031414.4267@portal.vpharm.com> <7980@sirius.ucs.adelaide.edu.au>
Distribution: na
Organization: University Of Kentucky, Dept. of Math Sciences

>>      Side one was normal, other side contained 2 parallel spiral tracks.
>>      Depending on just where you sat the needle, you got two different
>>      tunes.
>
>As someone else already noted, that album was by Monty Python: "Matching
>Tie and Handkerchief." Note that this only applied to original pressings
>of the album. When Arista reissued the album in the '80's, the mysterious
>"3rd side" disappeared.

Umm, there are three spirals on the second side of MTaH, not two.  You've
apparently missed one all this time :-)
-- 
Kenneth Herron                                           kherron@ms.uky.edu
University of Kentucky                                      +1 606 257 2975
Department of Mathematics           "Thanks to the magic of the slow-motion 
camera, we can now show you how ugly the inside of someone's mouth can be."
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Keywords: electrocution, hazards, danger, strange smells
Date: 21 Jul 92 05:13:06 GMT
Organization: U of Wisconsin-Madison College of Engineering

In article <12365@inews.intel.com> crichmon@sedona.intel.com writes:
>
>I have had multiple 110V shocks, but just recently, out 3 year old
>got a pair of tweezers and proceeded to insert them into an outlet
>in the kitchen ( one half in hot, the other in the return).  I am not 
>really sure if she got shocked (skin impeadance >> solid metal), but 
>she did get a decent heat burn. 

When I was a little kid in day care, I remember that there was this switch
plate on the wall that had a hole in it.  I always wondered just _what_
that hole was for...  It was just big enough for me to put my finger into,
so that my finger made good contact with the side of the hole.  I did this
on several occasions, each time sticking my finger in deeper... and deeper...
and deeper... and BZZZZZZTTT!  I got the first 120V shock of my life!  No
burns or anything, but I knew damn well I was never going to put my fingers
into unmarked holes again!

Thinking about it much later, I realized that the thing must have been a
light bulb base for a night light or something.  The day care should have
had the hole taped shut or something, but they probably didn't know what
it was either.

Oh well...

						---Joel Kolstad
					Who hasn't yet been shocked by
					anything more than 1 KV
From: brumbley@uoneuro.uoregon.edu (David Brumbley)
Newsgroups: sci.electronics
Subject: lead-calcium battery
Keywords: lead calcium battery
Date: 23 Jul 92 20:44:32 GMT
Article-I.D.: uoneuro.brumbley.168
Organization: Institute of Neuroscience, University of Oregon

Do lead/calcium-acid batteries use sulphuric acid.  If so, is it the same 
concentration as that used in lead-acid batteries?

----------------------------------------------------------------------
David Brumbley                    |               Tel:  (503) 346-4516
University of Oregon              |               Fax:  (503) 346-4548
Institute of Neuroscience         |
Eugene, OR 97403                  |       brumbley@uoneuro.uoregon.edu
----------------------------------------------------------------------
From: steve@nuchat.sccsi.com (Steve Nuchia)
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Date: 21 Jul 92 00:52:44 GMT
Organization: South Coast Computing Services, Inc.  Houston

I once took 230VAC hand-to-hand while working in a hot
distribution panel.  Pulled all the muscles in my chest
wall and shoulders, hurt for a few days, but I stayed on
my feet.

At age three I discovered that I could make the christmas tree
lights blink by playing with the plug.  It was great fun until
I got my finger across the contacts.  Three flips on the way
out from behind the tree, if I counted properly :-)
-- 
Steve Nuchia      South Coast Computing Services, Inc.      (713) 661-3301