HDTenEightyP/NetNews huggingface dataset:
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 7 Jan 1993 22:06:02 GMT
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <drury-070193073338@esrfd.es.dupont.com> drury@esvax.dunet.dupont.com (Robert F. Drury) writes:

	{responding to scenario that vaporizes 200 lb of water when
a rotor fails}

>    Well, I just can't let this one pass...I have to add my $.02 to this
>*interminable* thread.  Would anyone out there care to be in the same car,
>or for that matter within several hundred yards of a car, where 200 lb of
>water had suddenly and very rapidly been converted to superheated steam? 
>This would convert the whole car and occupents (sp?) to a large
>fragmentation grendade.  Just because something is vaporized does not mean
>it is rendered harmless; hot, expanding gases are what do the damage in all
>explosions.  When water is vaporized, it's volume increases ~1000X, so that
>200lb of water(25 gallons) suddenly wants to take up 25,000 gallons; wants
>to *bad*.  If constrained to remain at its original volume, it will be at
>1000 atmospheres, attained within microseconds.  The pressure vessel
>capable of containing this *will* weigh more than a battery pack, or a car.

	There was such a pressurized superheated mass of water here
in Washington, which burst about a decade ago.  The superheated water
was moist dirt, and the containment vessel was Mount St. Helens.
People died five miles away, and forests closer by (half a mile
or so) were converted into toothpick-size splinters.

	The local seismologists valiantly refused to tell reporters the 
energy yield of the explosion in any terms other than SI units.
I converted, though: it was about twenty megatons.

	There's a dome swelling in the caldera; Mount St. Helens
might be back up to its original altitude again some day.

	John Whitmore
Newsgroups: sci.electronics,rec.aquaria,misc.consumers.house
From: pngai@adobe.com (Phil Ngai)
Subject: Re: High Efficiency Fluorescent Lighting
Organization: Adobe Systems Incorporated
Date: Sun, 10 Jan 1993 08:00:24 GMT

Home Depot in Northern California has started carrying "electronic"
ballasts made by GE. The package says they are electronic but they
weigh the same as a regular ballast. The salesmen there of course are
completely clueless. "What frequency does this operate at?" "60 Hz".

I'm still waiting for the Taiwanese to flood the market with $10
electronic ballasts anyway.

-- 
My opinions are my own.
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Re: Laser cutting steel, what about glass?
Date: 8 Jan 93 11:05:07 CST
Organization: University of Kansas Academic Computing Services



>Probably everyone has heard of applications where laser beam is used to
>cut steel plates. But are there similar applications to cutting glass?
>Will the same setup do for glass or is it too hot?
>
>>I have a couple m^2 of raw factory mirror and would be interested in
>turning it into pieces of art. Would like to hear if anyone of you has
>experience in this field.
>
>How powerful does a laser have to be in order to cut 10 mm steel?

--
>jjj@mits.mdata.fi | PGP 2.0 key available | PGP 2.0 avain saatavilla

Metal fabrication lasers are almost all CO2 lasers at 10.6u wavelenght (far IR),
however some metal work can be done with pulsed ND-YAG lasers at 1061Nm. The
power density of the beam to cut 10mm steel would require 620 joules/(square
cm) which would equate to a 4200 watt beam at 1.5 mrad divergence. Lasers in
this power range are fast axial flow CO2 lasers (at cost of around $500,000).
The cutting of glass though presents some rather unique problems. The laser has
more than enough energy to cut the glass, but at IR wavelenghts, the beam would
tend to pass through the glass rather than heat it. Problems of reflection from
the glass surface, which would degrade the power of the beam is also a problem.
Ways of getting around this is to use a graphite type of coating on the glass
to enhance absorbtion and reduce reflection. Another problem is the glass
fracturing under the tremendous heat from the beam at a localized point. To
date, I don't know of any commercial application using lasers to cut the glass,
but they do use them to etch it. The beam can be attenuated to precise depth
and power levels for etching without fracturing. Woodcarving lasers (also CO2)
are around 20 to 30 watts and again, the power level can be adjusted for depth
of penetration into the wood. These guys can be bought for $3500 new and are RF
waveguide type CO2's. We have such a beast in my lab here at KU and I have been
known to 'woodburn' with it during those quit moments ;-)

-=-= Wes =-=-
From: mbk113@rsphy3.anu.edu.au (Marek Kaminski)
Newsgroups: sci.electronics
Subject: Re: RS 232 & RS-422 voltage specs wanted
Date: 9 Jan 1993 02:17:54 GMT
Organization: Australian National University
Distribution: world
Reply-To: mbk113@rsphy3.anu.edu.au (Marek Kaminski)
NNTP-Posting-Host: 150.203.15.53

In article <1ic8hnINNn10@uwm.edu>, albrecht@csd4.csd.uwm.edu (Chad
Edward Albrecht) writes:
|>
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!
|>Standard RS-232 uses +/- 5VDC
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!
|>
|>--
|>>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
|>><<>><<>>
|>|  Respond to any of these adresses:    |  "Oh Lord...Ooooh you are so
|>big..,|
|>|  --------------------------------	| So absolutely huge.  So ab -
|>sol-  |
|>|  albrecht@csd4.csd.uwm.edu            | utely huge.  Gosh, we're all
|>really|
|>|  albrecht@convex.csd.uwm.edu		| impressed down here I can tell
|>you!|
|>|  acct146@carroll1.cc.edu		| --Monty Python: The Meaning of Life|
|>|=====================================================================
|>========|
|>|  UWM-CSD UNIX/MICRO CONSULTANT  Phn# (414) 229-5370 [standard
|>disclaimer]  | 
|>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|>~~~~~~~~~
|>


wot? Huh? Hmm? @$%*?! maybe some NEW standard RS-232? Albrecht, please
shed some more light !

Marek Kaminski, Electronics Unit, RSPS&E, Australian National
University, Canberra
Newsgroups: sci.electronics
From: c13975@email.comm.mot.com (Ken Koldan)
Subject: Holes Theroy questions?
Organization: Motorola CSE
Date: Mon, 4 Jan 1993 13:57:31 GMT

In a posting from Eric H. Taylor - The Theories are full of holes -
there were questions asked about some things, etc. I found this 
subject very intriguing. My own ideas(questions) are this
1) If you ran elctron holes through the incandescent bulb would
not the holes be filled by the electrons in the conductor and thereby
causing current, electrons falling into a lower state and releasing photons
, and heat instead of cooling even though the pressure is decressing?
2)Could you get positron holes by using a traditional Fermilab (C0 facility, 
I think that is what the main detector is called) collider and examining the 
remains(terget substance) after the collision?
3)Could you collect holes by using semiconductors and forcing hole 
migration and then polarizing the semiconductor some how to seperate them.
Something like an electron centrifuge?
4)An amplifier that preferentially amplify holes over electrons is an 
interesting thought. How about more information on holes, being an EE I
like this idea.

Once again this is just my own thoughts.
Maybe I have been away from school to long?

Any information on the orginal theroy, is also welcomed.

Thanks
+----------------------------------------------------------------------+
|Ken Koldan                            |                               |
|Motorola Central Systems Engineering  |    X.400: C13975@email.mot.com|
|1301 E. Algonquin Road - IL02 Rm 0436 |    Voice: (708) 576-9176      |
|Schaumburg, Illinois. 60196 USA       |      Fax: (708) 576-5640      |
+----------------------------------------------------------------------+
Newsgroups: sci.electronics
Subject: Re: nicads for Gameboy?
From: manningc@procor.dialogic.com (Charles Manning)
Date: 11 Jan 93 20:26:11 GMT
Reply-To: manningc@procor.dialogic.com (Charles Manning)
Organization: Procor Data 1989 Ltd, Auckland, NZ.

>>>The manual for Gameboy says not to use nicad batteries. 
[Stuff deleted]
>
>Ni-cads have a lower nominal voltage (1.2) than alkalines do (1.5), so if
>you have 4 of them, you are almost a full volt less than with alkalines.
>If the game will run ok with ni-cads, there's nothing wrong with using 
>them.
>
Maybe nicads are OK for the GameBoy but be warned.  NiCads have extremely
low internal resistance, so they are capable of supplying very high
inrush currents.  Some circuits may suffer though I've used NiCads in most
equipment eg. photo flashes, walkman, radio recievers etc. without causing
problems even though some of these have warned not to use NiCads.


Charles

BTW Jason, its a good thing that 4*(1.5V-1.2V) is less than 1 volt.  It
could get pretty serious if it was 1.2 V.
From: kthompso@donald.WichitaKS.NCR.COM (Ken Thompson)
Newsgroups: sci.electronics
Subject: Re: Disc-cone antenna
Date: 4 Jan 93 15:34:24 GMT
Organization: NCR Corporation Wichita, KS

pierson@empror.enet.dec.com (dave pierson) writes:

)	Also, the classic discone is vertically polarized, and most TV is
)	horizontally polarised, so the discone should go on its "side".  At
)	which point it ceases being omnidirectional.  And has to be reaimed for
)	each channel.

Sorry,
Tv and fm broadcasts are circular in polarization.  
Any antenna polarization will work.
Antenne are put up horizontally because there is less man made noise that way.
     
-- 
Ken Thompson    N0ITL  
NCR Corp.  Peripheral Products Division   Disk Array Development
3718 N. Rock Road  Wichita KS 67226   (316)636-8783
Ken.Thompson@wichitaks.ncr.com 
Newsgroups: sci.electronics
From: cthomas@athena.mit.edu (Michael T Ford)
Subject: Re: DATA Sheet Needed for LM1881 (sync separator)
Keywords: lm1881
Organization: Massachusetts Institute of Technology
Date: Sat, 9 Jan 1993 09:42:06 GMT

In article <gregg.8@bss1.umd.edu> gregg@bss1.umd.edu (Gregg Piermarini) writes:
>Does anybody have any info/data sheets etc on a LM1881 chip.  It is a video 
>sync separator...also, although this may be a really general question..what 
>is the easiest way to separate the data from the video signal to display on 
>a computer monitor?  If any one has info or can point me in the right 
>direction I'd be greatly appreciated!
>gregg@bss1.umd.edu

I assume that you have standard NTSC video that you want to put on
your computer monitor.  If it is a composite monitor, it should work fine.
If you have an RGB monitor, you can make a circuit using a chip (can't remember
the number) that converts NTSC to RGB.  It was profiled in Radio-Electronics
a year or two back.  It was in their descrambling series.
However if you are starting with RF, you'll want to get a tuner--or run it
through your VCR, to get the baseband video (then go back to the beginning
of this paragraph).
Hope this helps...
Mike WZ0C

Newsgroups: sci.electronics
From: swanee@megadata.mega.oz.au (Geoff Swan)
Subject: Re: Detecting Sine Wave freq
Organization: Megadata P/L, North Ryde, Sydney, Aust.
Date: Tue, 12 Jan 1993 22:00:56 GMT

In article <1993Jan10.024315.24578@murdoch.acc.Virginia.EDU>, pmw2c@csissun10.ee.Virginia.EDU (Paul Michael Wayner) writes:
>  I'm interested in designing a circuit that will determine
>  if a sine wave frequency is in a certain range of values,
>  specifically, 45-51 MHz.  It is very important that the
>  detector be as reliable a possible, so I would like to use
>  only a few active components and try to stick to RC's as
>  much a possible.
>   					Paul Wayner

Have you looked at any PLL's yet? They should do the trick fairly easily.

--------------------------------------------------------------------------
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          (Fax) +61 2 887 4847

Newsgroups: sci.electronics
From: mtarrant@ATK.COM (Mike Tarrant)
Subject: Re: Problem with 68hc705 eval. kit
Organization: Alliant TechSystems Inc.
Date: Tue, 5 Jan 1993 15:39:48 GMT

In article <1993Jan1.162603.6390@desire.wright.edu> cse0239@desire.wright.edu writes:
>I got the 68hc705kics kit and it seems to work correctly on everything
>except blank check of the part. Has anyone had success blank checking
>an erased part? 
>
>Could this be a problem with my I/O port?
>
>

I had problems erasing a 705K1 also.  It took about 10-15 minutes.  I
then cleaned the window off better (there was still some adhesive from
the label stuck to the part).  After programming it again, it erased
in 2-3 minutes.  Try it and see if it works.
 


Newsgroups: sci.electronics
From: fluet@ee.ualberta.ca (Kevin Blaine Fluet)
Subject: Any good circuit CAD programs for X?  (shareware?)
Organization: University Of Alberta, Edmonton Canada
Date: Wed, 6 Jan 1993 20:32:18 GMT

Hi all!

I just recently installed linux (a free unix clone for pc compatibles,
complete with X windows) and was wondering if anyone knew of any good
circuit CAD/analysis programs that run under unix and use the X windows
system.  An ftp site name would be much appreciated but not entirely
necessary.

Thanks in advance!

Kevin Fluet
fluet@ee.ualberta.ca

Newsgroups: sci.electronics
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Re: Laser gunsights
Organization: U of Wisconsin-Madison College of Engineering
Date: 9 Jan 93 13:56:24 CST

In article <1993Jan9.122133.46254@kuhub.cc.ukans.edu> wellison@kuhub.cc.ukans.edu writes:

>As with ANY laser light source, the power
>is concentrated into a very tigh beam.

No, only a laser with some optics attached will have the power concentrated
into a very tight beam.  Lasers with no optics whatsoever have a very
diverging beam.
Xref: sparky sci.electronics:22437 sci.energy:6795 rec.autos:31505
From: jimc@tau-ceti.isc-br.com (Jim Cathey)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 11 Jan 93 23:05:30 GMT
Organization: ISC - Bunker Ramo, Spokane, WA

In article <1993Jan11.163152.542@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>Consult the Hazmat database, or the DOT classification schedule. Black
>powder is most definitely classed as an explosive while nitrocellulose
>propellant powder is classed as a flamable solid...

Then again, the DEA classifies Marijuana as a narcotic, although it isn't.
Not that this proves anything about black powder.  :-)

-- 
+----------------+
! II      CCCCCC !  Jim Cathey
! II  SSSSCC     !  ISC-Bunker Ramo
! II      CC     !  TAF-C8;  Spokane, WA  99220
! IISSSS  CC     !  UUCP: uunet!isc-br!jimc (jimc@isc-br.isc-br.com)
! II      CCCCCC !  (509) 927-5757
+----------------+
			One Design to rule them all; one Design to find them.
			One Design to bring them all and in the darkness bind
			them.  In the land of Mediocrity where the PC's lie.
Newsgroups: sci.electronics
From: mmaster@parnasus.dell.com (Michael Masterson)
Subject: Re: Where to mount an outside temp probe on a car?
Organization: Dell Computer Co
Date: Mon, 4 Jan 1993 22:04:54 GMT

wcurtiss@travis.csd.harris.com (William Curtiss) writes:

>In article <1993Jan4.002944.6494@sequent.com> washer@sequent.com (Jim "Throw it over the wall" Washer) writes:
>>I'd like to mount a temp probe on my car to sample the air temp. I'd like
>>to get as accurate a reading as possible (without exceeding some reasonable
>>cost).
>>
>>Has anyone done this? Where did you mount the probe... How did you protect it?

The fancier GM cars have 'em mounted right behind the grill.. My
Toronado has it mounted right behind the grill, in a little enclosure
so that the air flows over it as the car moves.

In response to your note about what the temp sensors on your car
did... on the Toro, it uses one sensor to get outside temp, one for
inside temp, one looking up that the sun shines on so it can tell how
hot the sun is and adjust A/C accordingly, then it has a sensor in the
high side and another in the low side monitoring the freon temps...
so, the climate control system has a total of FIVE temp sensors! (go
figure)


-- 
Operated by professionals, do not try at home, see your dealer for details.
Your mileage may vary. Call before digging. Best if eaten by date on package.
Apply only to affected area. Batteries not included. Member FDIC.
Michael Masterson                                   mmaster@parnasus.dell.com
Newsgroups: sci.electronics
From: srfergu@rufus.erenj.com (Scott Ferguson)
Subject: Re: PIXAR
Organization: Exxon Research & Engineering Co.
Date: Wed, 6 Jan 1993 18:50:40 GMT

In article <CTDONATH.93Jan6120211@mothra.syr.EDU>, ctdonath@mothra.syr.EDU (Carl T. Donath) writes:
|> 
|> BTW: does anyone know who developed the "morphing" techniques? Was it PIXAR?

I think Newtek did it first in their Amiga/Video Toaster product.

-- 
----------------------------------------------------------------------
Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      New Jersey
----------------------------------------------------------------------
"Always bark at a dog."
From: jaker@csugrad.cs.vt.edu (Jake Rose)
Newsgroups: sci.electronics
Subject: Parts, parts, parts... (Where?)
Date: 11 Jan 93 20:55:37 GMT
Organization: Virginia Tech Computer Science Dept, Blacksburg, VA

I'm newish to electronics projects, although I've had a lot of theory and done a
lot of breadboarding (and have experience PC boarding), and I'm looking for
parts and mounting suggestions for do-it-yourself sorts of projects.
Specifically, I want to put together a small amplifier to go between my
microphone and my Amiga's digitizer.  I've heard about amps-on-a-chip, but I
have no experience with them at all.  Has anyone worked with them or know where
and what kind to get?  I'm trying to keep it simple... ...I also need something
to house this in, and I'm interested in where good places to buy components in
general are.  If anyone has any information, please email me.  Thanks!

-- 
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Jake Rose              :: If you eat a live frog in the morning, nothing worse
jaker@csugrad.cs.vt.edu:: will happen to either of you for the rest of the day.
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
From: wookie@terapin.com (Barry Vanover)
Newsgroups: sci.electronics
Subject: Re: DOES AMERICA SAY YES TO JAPAN? - Off track!!
Date: 7 Jan 93 09:00:06 PST
Organization: BBS



Why is this Japan crap debate in this Sci-
Electronis Newsgroup????

Move over to another newsgroup thats correct for talk about this subject!

Please!
Newsgroups: sci.electronics
From: johnl@avs.com (John W. Langner)
Subject: Re: Do I need FCC approval for small devices?
Organization: Advanced Visual Systems Inc.
Date: Thu, 7 Jan 1993 23:33:58 GMT
X-Posted-From: aurora.avs.com
NNTP-Posting-Host: sol.ctr.columbia.edu

In article <20692@ksr.com> jfw@ksr.com (John F. Woods) writes:
>washer@sequent.com (Jim "Throw it over the wall" Washer) writes:
>>I have designed a small micro-contoller based product. It contains the 
>>micro-controller, a DTMF tone decoder, and some glue chips. I am
>>considering marketing this in both kit form, and as an assembled product.
>>Do I need to get some sort of an FCC approval on this? It is a computer
>>of sorts... and I understand that all computers must meet FCC standards..
>
>If it has a clock frequency over some low value (tens of KHz?) it needs to
>meet FCC emissions requirements.

There was an article on this topic in a very recent issue of 
Midnight Engineering magazine.

I won't paraphrase my vague recollections of the exact rules because I
don't want to spread bad information.


--
From: albrecht@csd4.csd.uwm.edu (Chad Edward Albrecht)
Newsgroups: sci.electronics
Subject: Re: RS 232 & RS-422 voltage specs wanted
Date: 12 Jan 1993 18:00:25 GMT
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4

After receiving slews of flame mail and many degrading posts regarding
my post, I have decided to explain the situation for all you happy
flamers.

When I said "Standard RS-232 uses +/-5V DC" I was reffering to the voltage
that it is capable of handling, not what is used as a standard voltage. I
have built many serial interfaces and used 5 volts to serve as my communication
voltage without problems.  I also realize that +/- 9V DC and +/- 12V DC are
usually a more stable level (and also recomended) but it will work just
fine with 5 volts.  Sorry for any inconvenience caused!


--
>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
|  Respond to any of these adresses:    |  "Oh Lord...Ooooh you are so big..,|
|  --------------------------------	| So absolutely huge.  So ab - sol-  |
|  albrecht@csd4.csd.uwm.edu            | utely huge.  Gosh, we're all really|
|  albrecht@convex.csd.uwm.edu		| impressed down here I can tell you!|
|  acct146@carroll1.cc.edu		| --Monty Python: The Meaning of Life|
|============================================================================|
|  UWM-CSD UNIX/MICRO CONSULTANT  Phn# (414) 229-5370 [standard disclaimer]  | 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Newsgroups: sci.electronics
From: rich@pencil.cs.missouri.edu (Rich Winkel)
Subject: Where's the FAQ?
Organization: University of Missouri
Date:  6 Jan 93 23:06:41 GMT

Doesn't this group have a faq?  I have a couple easy questions on microwave
ovens that I'm sure would be covered in it, if it exists...

Rich
Newsgroups: sci.electronics
From: adm@ccadfa.cc.adfa.oz.au (Alan Moss)
Subject: Re: Why etch? Is copper deposition possible?
Organization: Australian Defence Force Academy, Canberra, Australia
Date: Mon, 11 Jan 1993 01:23:38 GMT

Copper deposition is definately possible, but the process I have seen
would be out of the reach of most people.

A company called Lintek here on Australia can "grow" a pcb pattern on
just about any substrate, 2 or 3 dimensional. They do this by depositing
a layer, suitably masked, by plasma deposition in a vacuum. The accuracy
is almost unbelievable, I have seen a board with five traces emerging
from between two adjacent ic pins. Once the vapor deposition is done the
traces are "grown" to the required thickness by electroplating. I wish I
had thought of it !


Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Phased sonar
Organization: Motorola Computer Group, Tempe, Az.
Date: Mon, 11 Jan 1993 17:37:09 GMT

In article <1993Jan11.025137.5570@ee.ubc.ca> jmorriso@ee.ubc.ca (John Paul Morrison) writes:
>In article <1993Jan10.104636.5690@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
>
>The 3 transponders are like 3 antennas. Send pulses into the transponders
>with different phase angles, and the outputs add and substract in nifty
>patterns. The outputs interfere, cancelling out, or add, making the output
>focused in a certain direction.
>WIth nifty control electronics, who needs a spinning transponder/antenna.

I've wondered about this. Does each element of a phased array have its
own programmable delay line? The phased array radars I've seen look
like they have a LOT of elements.

John


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Newsgroups: sci.electronics