HDTenEightyP/NetNews huggingface dataset:
From: jtchew@csa3.lbl.gov (JOSEPH T CHEW)
Newsgroups: sci.electronics,alt.folklore.urban
Subject: Re: SHOCKING STORIES
Date: 31 Jul 92 16:40:28 GMT
Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
Reply-To: jtchew@csa3.lbl.gov
NNTP-Posting-Host: 128.3.254.198
News-Software: VAX/VMS VNEWS 1.3-4   

> Ok. I want to know from the net people. What is the largest voltage shock
> you have ever received (and survived.) I am not talking about rewiring
> a light switch. I am talking about kissing the flyback transformer.

While I'd rather not receive any electric shock at all, I'd rather get 
bit by the flyback (high voltage, but a fairly "dry" circuit) than the 
B+ supply (enough voltage and hundreds of mA at the ready) any day.
KISSING it doesn't seem like such a good idea, though.  

If you're grounded properly you can get yourself a good smack with 
110V ac as well.  People tend to dismiss it because most of their 
familiar shocks come when they're poorly grounded.  

Got to admit, this CAN be funny in a macabre sort of way.  We were 
rolling on the floor in high school physics when one of our putatively
brainier classmates pointed out some feature of his tesla coil with
a pencil while his other arm brushed against the lab sink.  Figured
the wooden pencil would be a good insulator.  Forgot about the graphite.
Of course, if he'd ended up with cardiac arrest instead of near-lethal
humiliation, it wouldn't have been quite as funny.

>> Worst shock: I had the power transformer from an old tube TV set.  I was
>> testing the filaments of some tubes, and the leads I thought were the 6.3V
>> windings were the ones for the B+ plate supply. 

If you've never put B+ across the filaments, you haven't worked with 
tubes very long.  Gotta admit, though ( * snicker * ) that most people
learn that lesson when smoke-testing a new or repaired chassis, not 
with the ol' "digital voltmeter"...

Not long ago, one of the ham radio rags saw fit to remind their readers
that tube-type equipment generally does not run on +- 12V and +5V.  I'm
too young to feel that old.  Followup to alt.electronics.geritol?

--Joe
"Just another personal opinion from the People's Republic of Berkeley"
Newsgroups: sci.electronics
From: gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan)
Subject: Re: DMM w/inductance
Summary: Do you need a design for a 0.0 to 1.0 uH inductance meter?
Organization: Arizona State University
Date: Thu, 23 Jul 1992 01:48:06 GMT

gbchoy@taco.ucdavis.edu (Garett Brandon Choy) writes:
....... [lots deleted]
> trying to find a fairly good DMM that can read capacitance and INDUCTANCE.

Inspired by an article in RF DESIGN magazine (good read by the way),
I designed a CHEAP 1.0 microHenry Fullscale Inductance meter. Uses ONE IC,
a NE602, a PNP, and some 2-sided PC board material. Runs at about 10MHz.

Resolves 5 or 10 nanoHenries; uses phase-shift method (from RF DESIGN) to
ignore resistance. Good at sorting 100 nanoH surface mount inductors, etc.
Or measureing scope probe ground leads, or tweezers.

You zero it with a 10 ohm resistor. Then calibrate it with some known coil
Send mail, and I'll email the design.

Allen Sullivan     gsulliva@enusha.eas.asu.edu



Newsgroups: sci.electronics,sci.materials,sci.physics,sci.engr.chem
From: snyder@henry.ece.cmu.edu (John Snyder)
Subject: Re: PZT Excitation
Organization: Physics Department, Carnegie Mellon University
Date: Mon, 27 Jul 1992 20:46:14 GMT

In article <1992Jul27.185909.19949@pbhyg.PacBell.COM> rhsomer@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
>


It depends on what you mean by "insulator from magnetic forces".  Do you mean
a material that itself is unaffected by magnetic fields?  In this case, use
a material that is a diamagnet.  Find a table of magnetic moments at some 
temperature as near as possible to the temperature at which you will be 
operating.  Fused silica is a material that has quite a low moment.  If you
can tolerate a very small force, you can also use materials that are 
paramagnets (in general, any metal or alloy that does not contain Co, Ni, or
Fe, although there are surely plenty of exceptions to this).

If instead, you are trying to find a material that will shield neighboring
material from magnetic material, then you want a soft magnetic material with
very high permeability.  Permalloy is a common one.  Getting the coercivity 
low enough and the permeability high enough is difficult.  Bending or denting
the material seriously degrades the performance.  If you are making a 
shielding structure, you will want to construct it into final form *FIRST*,
then give it its final heat/annealing treatment. And treat it carefully
after the final annealing treatment.

Another possibility, if you can operate at cryogenic temperatures,
is to use the Meisner effect of superconductors to shield you.  Or
another possibility is to use a superconductor at cryogenic temperatures
to shield neighboring material which is at a different temperature.

Hope this helps

John
snyder@henry.ece.cmu.edu
Newsgroups: sci.electronics
From: oliverb@vis.toronto.edu (Oliver Bengtsson)
Subject: Radar Detectors, and Radar Detector Detectors
Summary: basics of operation.
Keywords: Radar
Organization: Department of Computer Science, University of Toronto
Date: 23 Jul 92 20:23:06 GMT

   Could someone out there please tell me how a radar detector detector
works? I thought that a radar detector was a passive device, nothing more
than a receiver tuned into detect a certain radio frequency used in radar
guns. If this is the case, how can they be detected?  
 
  Further, is it possible to detect radar detector detectors?

  Any information to shed light on this problem would be greatly 
appreciated.


Oliver

Newsgroups: sci.electronics
From: grante@aquarius.rosemount.com (Grant Edwards)
Subject: Re: Pressure Transducers?
Reply-To: grante@aquarius.rosemount.com (Grant Edwards)
Organization: Rosemount, Inc.
Date: Sat, 25 Jul 1992 21:02:13 GMT

wdlee@ccwf.cc.utexas.edu (david lee) writes:
: Netones: Do you know of any 'solid-state' pressure transducers?
: I recall seeing a construction article somewhere that described
: their use in altimeters. (I need a transducer that can measure
: static atmospheric pressures.) I seem to recall that they were
: made in silicon using microlithography techniques.
: 

The company I work for (Rosemount Inc.) manufactures two types of
silicon pressure transducers.  One type is a strain-guage type thing.
The other type is a capacitor where one "plate" is moved by the
pressure being measured.  Both are built out of silicon using
microlithography techniques.

We also make metal capacitance and metal vibrating beam pressure
sensors.

These can be built to measure absolute or differential pressure.

Rosemount's pressure transmitters are sold mostly into the process
control marketplace (oil companies, chemical companies, paper mills,
that sort of thing).

There are several Rosemount sales offices in Texas (Huston, Dallas,
Freeport, San Antonio, Midland, Beaumont, Corpus Christi).  They are
used to dealing with Exxon, Dow, and people like that -- I'm not sure
if they deal much with individuals or shools.

A good place to look for other sensors would be in any of the process
control trade magazines.

--
Grant Edwards                                 |Yow!  This PIZZA symbolizes
Rosemount Inc.                                |my COMPLETE EMOTIONAL
                                              |RECOVERY!!
grante@aquarius.rosemount.com                 |
Xref: sparky sci.electronics:13388 comp.robotics:1449
From: dwilliam@jabba.ess.harris.com (David Williams)
Newsgroups: sci.electronics,comp.robotics
Subject: Re: Information for controlling/using 5-6 wire steppers
Keywords: steppers motors
Date: 27 Jul 92 17:31:46 GMT
Organization: Harris Information Systems Division, Melbourne, FL

[stuff tossed... talking about using 8051, or the 8052]

>You're right.  You'd need the EPROM version (87C51FB).  Then you probably won't
>need any external memory at all.  So it's just the bare chip, RS-485 or RS-232
>chip, crystal, reset circuit, and buffers for the I/O pins.

>Imagine that: a microprocessor board without a single bus on it.

  Have you ever tried to debug a system using one of these things? 
I hate trying to 
a) build and debug one in the first place
b) fix a broken one

   why?  You got no idea what's going on!  If your program crashes, or
gets a little flakey, there's no address/data bus to look at with a logic
analyser to see what it's doing.  This isn't so bad once you have a system
up and running (completed, that is), but it's impossible when you're 
building it.
   Need more ports?  Just stick an 8255 in.  Minimum system is 8051, 
latch, ROM, 8255, crystal, and various capacitors.

>>	Also, Zilog has a killer controller with DSP if "sasrer" wants
>>to implement feedback to control the stepper so pull-out won't occur.
>>(No zilog here tho'... I've had enuf of using their stuff.)
>>tching@water.ca.gov

>What are you using right now?  The 8096 and (especially) 80960 have potential,
>if you like chips with an 8051 feel but 16 or 32 bit power.  The '96 is ideal
>for closed-loop applications with its high-speed I/O.

   I dunno.  I looked at the data sheet for the 8096 and immediately said
"Gaaaahhhhhhh"  Something about that chip just really bugs the hell out of
me.  We used 3 8051's in our project to get enough processing power to spin
the steppers fast enough.  I realized at the time that the timer array in
the 8096 would have done the job just fine, but there's that strange bad
feeling about it.  Anyone else have this problem?

-- 
      Dave Williams                                              My 
        dwilliam@jabba.ess.harris.com                         opinions	 
           "Huh?  What?  Could you repeat the question?"        only.  
Newsgroups: sci.electronics,rec.audio
From: jonas@world.std.com (Jonas R Klein)
Subject: Re: Life after CDs
Organization: The World Public Access UNIX, Brookline, MA
Date: Thu, 23 Jul 1992 05:27:24 GMT

>Maybe the next generation is a 12" sound-only analog LD. Surely this
>would make the die-hard-vinyl-LP-loving crowd happy? And think of the

Would it have hiss and scratches?  Could you slow the disk to 33 rpm,
so the scratches would sound nice?
-- 
____________________________          ______________________
    |                                |                      |
    |   +Jonas Klein                 |  "Place clever       |
    |    jonas@world.std.com         |  "disclaimer here."  |
Newsgroups: sci.electronics
From: pegasus@csd4.csd.uwm.edu (David R Hucke)
Subject: LED buffer  (how?) (was 8051 help needed)
Originator: pegasus@csd4.csd.uwm.edu
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Date: Thu, 30 Jul 1992 18:15:42 GMT

Thank you all for helping me out with my 8051 question..

Several said that I would pulling too much current through the port
pin and I should use a transistor as a buffer...

WOuld somebody tell me how to do that?  Do I use an NPN or PNP?
What does the schematic look like? 

Could somebody explain to me in clear english the theory behind the 
operation of the transistor being used as a buffer?

Thank you very much again...



-- 
pegasus@csd4.csd.uwm.edu                David R. Hucke
                                        UW-Milwaukee Film Major
--
Xref: sparky sci.electronics:13267 rec.audio:10806 alt.folklore.computers:11092
From: edhall@rand.org (Ed Hall)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 24 Jul 92 20:41:46 GMT
Organization: The RAND Corporation

In article <1343@eouk9.eoe.co.uk> ahaley@eoe.co.uk (Andrew Haley) writes:
>No, it's not apocryphal, but you've got a slightly distorted version.
>The person was Akio Morita, not his wife, and one of his favourite
>pieces is Beethoven's Ninth, which, if played fairly slowly, can be 74
>minutes long.

Actually, Beethoven's Ninth is probably the best-known piece of
Western classical music in Japan.  There are dozens of performances
of it there a year--even "sing alongs" in German (likely the only
German many of the participants know).

>The Dutch engineers at Phlips supposedly wanted an
>hour, which sounded like a nice round figure.

And which isn't quite enough for B.'s 9th.  I don't think that 74
minutes was an exact target, but exceeding 60 minutes was.

Disks are made longer by recording closer to the outside edge, where
it is harder to keep within tolerances.  As presses and CD players
have improved, the maximum figure has gone up.  The absolute maximum
is somewhere in the low 80's.

>Incidentally, one of Morita's best friends was Leonard Bernstein.  I
>wonder how long his recorded performances of the Ninth are.  Anyone
>know?

I don't know off hand, but it wouldn't surprise me if there were
differences of a few minutes between them (he's recorded several).
Someone in rec.music.classical would be sure to know.

		-Ed Hall
		edhall@rand.org
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
From: amconn01@ulkyvx.louisville.edu
Subject: Re: Airport X-Rays
Organization: University of Louisville
Date: Sat, 25 Jul 1992 12:53:37 GMT

In article <RON.92Jul24154950@bert.cs.byu.edu>, ron@bert.cs.byu.edu (Ron Snyder) writes:
> 
>    Someone who travels often should do us all a favor and experiment. Pack
>    360K, 1.2M and 1.4M disks with data (one big ZIP file, perhaps) and put
>    them in the luggage that will be X-rayed. Trying to unZIP the file will
>    reveal if any of the data has been corrupted. If several people do this
>    in several airports (a variety of X-Ray equipment) and post the results,
>    we'll all know for sure.
> 

Three years ago I subjected various types of floppies (5.25, 5.25 HD, 3.5, 3.5
HD) to as much as 1.5 Gy of x rays. File and media verification showed no
errors and the disks appeared fine. I didn't think anything would happen but I
did this to satisfy colleagues who had their doubts. As previous posters have
stated, it is the magnetic fields associated with the HV transfromers used in
radiographic units which have the most potential for causing damage to magnetic
media. An x-ray flux would have to be quite high (no, I haven't done the
calculations) to cause damage to a disk, although, since we are talking about
probabalities, there is always that finite, albeit small chance; but then,
there is a infinitesimally small chance of damge from natural background
radiation. And maybe I'll win the lottery :-) Twice!

Michael Connor/Castigat ridendo mores!
From: amigo@milton.u.washington.edu (The Friend)
Newsgroups: sci.electronics
Subject: good op amps for audio
Date: 23 Jul 92 18:56:04 GMT
Organization: University of Washington


	Interested in the best op amps for work in active crossovers, 
and maybe replacement in CD players (which are known to not have the best
op amps installed).

				_-> Mike
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: harley@tt.com (Scott Drysdale)
Subject: Re: Life after CDs
Organization: Telecommunications Techniques Corporation, Germantown MD
Date: Fri, 31 Jul 1992 16:59:09 GMT

In article <1992Jul30.112024.14197@coli.uni-sb.de> chbl@sbustd.rz.uni-sb.de (Christian Blum) writes:
>shoppa@erin.caltech.edu (TIM SHOPPA) writes:
>> "grooves").  CD's are not recorded in tracks and sectors as are floppies, but
>> in a spiral.  This allows the head-positioning algorithm to smoothly track
>> along as music plays, instead of having to jump from track to track and
>> simultaneously trying to ensure that enough music was stored in the buffer to
>> continuously play as the head settles on the new track.  There is probably a
>
>Have you ever put your ear on your player while it was playing a CD?
>It definetely steps!

the stepping you are hearing is the coarse tracking catching up with the fine
tracking.  not all players do this, but some have a limited-travel (fine)
tracking system which is carried by the coarse tracking system.  in some cases,
the coarse system is driven by a stepper motor, and the fine system deals with
the in-betweens.

>Course. You simply have to put two CDs together. Try it in your player, it
>works.

um, this is not a good idea.  the mechanism is designed to handle the thickness
of one cd.  many will jam when presented with more than one cd.

>Chris.


-- 
----------------------------------------------------------------------------
scott drysdale (harley@tt.com, ...!uunet!debbie!harley), software mercenary.
formerly mr. bridgeboard @ cbm.  soon to be a seaman recruit in the us navy.
----------------------------------------------------------------------------
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: SCDOWN
Date: Mon, 27 Jul 92 23:58:34 CDT
Organization: The Inquiring Mind  1 204 488-1607

holderied@urz.unibas.ch writes:

> I am currently troubleshooting a circuit, which contains the
> following Parts, of which I cannot find datasheets or manufacturers:
> Current sources: CIL256, 1N5314, 1N5290
> Transistor     : MPSA 12
> Can anybody tell me the currents of the current-sources and a source for
> those parts?
> Thanks       george
> 
> George Holderied, Institut fuer physikalische Chemie, Universitaet Basel,
> E-mail(see header) or Fax +41 61 2673857
> 

1N5314 = FET current source 4.70 mA +- .47, .235 mohms @25V,.012Mohm/6V
1N5290 = " "                0.47 ma +-.047, 2.70 M @25V,.75M/6V
CIL256 = don't know
I got this data from Motorola data books and the parts should still be 
available.  Although the 1N p/n's are universal JEDEC numbers.  I believe 
the CIL are from Japan. 

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: martin@datacomm.ucc.okstate.edu (Martin McCormick)
Subject: Re: SHOCKING STORIES
Organization: Oklahoma State University, Stillwater, OK
Date: Wed, 22 Jul 1992 17:32:18 GMT

In article <1992Jul18.175339.10396@newstand.syr.edu> feliccia@rodan.acs.syr.edu (Nicholas J Feliccia) writes:
>..
>
>Ok. I want to know from the net people. What is the largest voltage shock
>you have ever received (and survived.) I am not talking about rewiring
>a light switch. I am talking about kissing the flyback transformer.

Once upon a time, when I was an electronics technician with the Audio Visual
department, here, we got a dead monitor in for service.  It had no high
voltage, but I thought I was being really smart to discharge the CRT anode.
It showed no voltage so I started looking at the input to the power supply.
If my memory serves me, the line cord went through a bridge rectifier, a 
200uf electrolitic capacitor and, then, to a fuse which separated that circuit
from the switching transistor which drove the flyback.  My last clear memory
was of snaking a probe along the glass body of the fuse to the other end
to see if it was good.  What I didn't know at the time was that the 117-Volt
power line charged that big capacitor to peak voltage.  There was no bleader
across it so it sat there at about 180 volts waiting to shake my hand.
The fuse was blown and there was nothing to discharge it until my hand
touched the other end of the fuse.  It felt like getting hit with a hammer.
The juice went through my right arm, and I don't know why I didn't jump and
break the neck off the CRT, but I didn't.
	I have grazed 250 volts before, but that only hurt a little and
startled me.  The 200uf capacitor really nailed me and what's even better,
it still made a big spark when I shorted it out later so as not to get hit
again.

Martin McCormick WB5AGZ   Stillwater, OK
O.S.U. Computer Center Data Communications Group
Newsgroups: sci.electronics
From: swanee@megadata.mega.oz.au (Geoff Swan)
Subject: Re: Any LOW power PAL/GALs?
Summary: sime thoughts
Organization: Megadata P/L, North Ryde, Sydney, Aust.
Date: Wed, 29 Jul 1992 00:32:29 GMT

In article <1992Jul27.025931.6415@ee.ubc.ca>, jmorriso@ee.ubc.ca (John Paul Morrison) writes:
> 
> I want to use a PAL or equivalent in a low power application.
> So far, the best I've done is a NS GAL20V8, quarter power.
> 
> Allegedly this part is CMOS (EEPROM), but I measured about 30 mA
> sucked in, when nothing was clocking it. Doesn't sound like
> CMOS to me (ie  uA standby current).
> 
Have you had a look at the Altera EP series EPLD's? They claim 15mA max on
devices (even the EP910 40 pin device). I've used them and measured only
around 8mA running on some circuits. Also the Texas TIC PALs are low power.
Ulimately it will depend on the size and speed requirements of the logic.

    Sla/n go fo/ill,
                    Risky B.
--------------------------------------------------------------------------
Geoff Swan (research & development)   _--_|\         swanee@megadata.oz.au
Megadata Pty Ltd                     /      \ 
2/37 Waterloo Rd, North Ryde,        \_.--._/               +61-2-805-0899
NSW 2113, Australia.                       v           (AH) +61-2-477-6519
Xref: sparky sci.electronics:13338 rec.audio:10843 alt.folklore.computers:11155
From: ahaley@eoe.co.uk (Andrew Haley)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 26 Jul 92 16:40:24 GMT
Organization: EO Europe Limited, Cambridge, UK
X-Newsreader: Tin 1.1 PL3

ALAN@VM1.McGill.CA (Alan Greenberg) writes:
:  In the May 1992 Stereo Review, a reader wrote in asking if it was true
:  that the CD was designed to hold Beethoven's Ninth (which the reader
:  said was 76.5 minutes).  The reply was
:  
:    "According to Dr. H. Nakajima, who headed Sony's design team for the
:    compact disc, its diameter was changed from 4 to 4.72 inches specifically
:    to fit the a typical recording of Beethoven's Ninth Symphony."
:  
:  Alan
 
76.5 minutes!  Ow!  That must be played at a funereal pace!  The
version I've got, which is (allegedly) played at the speed given by
Beethoven's metronome markings, is 62:23.  I think it's probably the
fastest version ever recorded, but that's how I like it... :-)

Andrew.
From: chbl@sbustd.rz.uni-sb.de (Christian Blum)
Newsgroups: sci.electronics
Subject: Re: Life after CDs
Date: 24 Jul 92 21:56:09 GMT
Organization: Studenten-Mail, Rechenzentrum Universitaet des Saarlandes

einari@rhi.hi.is (Einar Indridason) writes:
> In <14mdkjINNb4m@grapevine.EBay.Sun.COM> smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
> 
> >In article <1992Jul23.041115.20377@bilver.uucp>, bill@bilver.uucp (Bill Vermillion) writes:
> 
> >There is a story (probably apocryphal, anyone know?) that the 74 minutes
> >time was chosen because it was just long enough to hold the Sony MD's wife's favourite piece of classical music...
> 
> I have heard that, and the classical music piece is supposed to be
> Beethoven's 9th symphony.
> 
Rubbish, it's about 63 minutes only!

Chris.
Newsgroups: sci.electronics