HDTenEightyP/NetNews huggingface dataset:
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,rec.autos.tech,sci.energy
Subject: Re: Flywheel batteries as EV power source
Date: 20 Dec 1992 23:25:51 GMT
Organization: HST Wide Field/Planetary Camera
Distribution: world
Reply-To: carl@SOL1.GPS.CALTECH.EDU
NNTP-Posting-Host: sol1.gps.caltech.edu

In article <gfATnhq00iUzI1mV0H@andrew.cmu.edu>, cd1i+@andrew.cmu.edu (Christopher Bradley Devlin) writes:
=In article <1992Dec15.004956.465@mtu.edu> cmwolf@mtu.edu (christopher m. wolf) 
=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
=
=What is all this talkk of particles blowing through the housing?  What
=particles?  The original premise was that these flywheels disintegrate
=into a light cotton like fiber.  Heat, yeah, but how much kinetic energy
=does a flying piece of cotton have?

See?  I *TOLD* you the propaganda would be effective.  The answer to your
question is: That flying piece of cotton will have approximately as much
kinetic energy as was originally stored in the flywheel.  That follows from the
law of conservation of energy.  Just because it's fluffy doesn't mean it's not
dangerous, given that it's going fast enough.
--------------------------------------------------------------------------------
Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL

Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.  My
understanding of astronomy is purely at the amateur level (or below).  So
unless what I'm saying is directly related to VAX/VMS, don't hold me or my
organization responsible for it.  If it IS related to VAX/VMS, you can try to
hold me responsible for it, but my organization had nothing to do with it.
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: dean@vexcel.com (Dean Alaska)
Subject: Re: Flywheel batteries as EV power source
Organization: VEXCEL Corporation, Boulder CO
Date: Thu, 17 Dec 1992 21:21:41 GMT

In article <1gqhqfINNjot@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
>In article <1992Dec17.165111.10240@vexcel.com>, dean@vexcel.com (Dean Alaska) writes:
>>It seems that the energy would never be more than in a tank of gasoline
>>and that it need not be shielded any better than that tank of gasoline
>>for it to be considered as an alternative from the perspective of
>>safety.  We know how dangerous an exploding gas tank can be but we
>>also know that it doesn't explode too often.
>
>Dean, try the following experiment:  Take a fairly small amount of gasoline,

I understand that difference.  My mistake was in comparing 2 worst case
accidents with radically different probabilities.  A gas tank _explosion_
may be worse than a fly-wheel failure but whereas the gas tank almost
never explodes, the flywheel failure is assumed to immediately release
its energy.  Is this assumption correct?  Is it possible that flywheel 
failure might occasionally (or frequently?) result in the flywheel just 
slowing down due to a partial mecanical failure?  It seems that this
might be a more productive approach than trying to contain the
explosive force.
>--------------------------------------------------------------------------------
>Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL
>
>Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.  My
>understanding of astronomy is purely at the amateur level (or below).  So
>unless what I'm saying is directly related to VAX/VMS, don't hold me or my
>organization responsible for it.  If it IS related to VAX/VMS, you can try to
>hold me responsible for it, but my organization had nothing to do with it.


-- 
==============================================================================
A though for the holidays:
   "Wine is living proof that God loves us and likes to see us happy"
	- Benjamin Franklin			dean@vexcel.com
Xref: sparky sci.electronics:20912 sci.energy:6173 rec.autos.tech:16784
From: basiji@stein.u.washington.edu (David Basiji)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 03:52:14 GMT
Article-I.D.: u.1992Dec17.035214.15058
Organization: University of Washington

carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:

>Er, the amount of energy that escapes is exactly the amount of energy you
>started with.  Law of conservation of energy comes into play.  All the energy
>from the flywheel will have been converted into these other forms, as you point
>out.  That doesn't mean we can ignore it.  True, we're not likely to be talking
>about hypersonic bits of the flywheel.  But enough energy to move that vehicle
>on the order of 100 miles at freeway speeds is still around there someplace. 
>It didn't just vanish.  And that's a LOT of energy.  And it got dumped FAST.

>In other words:  BOOM!

>Unless you wrap the flywheel in a massive enough container that it can absorb
>all that energy without vaporizing, you're going to have an explosion.

I would design a housing of Kevlar or Spectra woven around a thin lead
alloy lining. The lead would prevent small particles from penetrating the
weave by distributing the force over an area larger than the mean cell
size of the fabric.  The weave would contain any larger particles so that
the energy would be dissipated within the housing by all the mechanisms
mentioned before, as well as a considerable portion from particulate
collisions within the housing.  The housing would be relatively light
and could be formed into fairly complex shapes. Cost would not be prohibitive
, probably on the order of $300, with economies of scale.

David Basiji
UW Bioengineering
NeRD #3762
Newsgroups: sci.electronics
From: al@qiclab.scn.rain.com (Alan Peterman)
Subject: Re: Looking for Western Electric Power Amps
Keywords: power amp
Organization: SCN Research/Qic Laboratories of Tigard, Oregon.
Date: Fri, 18 Dec 1992 07:30:29 GMT

Problem with finding parts, or whole amps, from Western Electric is 
that they have become collectable - and rather valuable.  Good ones
can be worth kilobucks..and the transformers are the 
most valuable parts.  

I remember buying them from the surplus places in the early 60's...
usually at $10 or so.  Ah well...

-- 
Alan L. Peterman                                 (503)-684-1984 hm & work
                       al@qiclab.scn.rain.com
It's odd how as I get older, the days are longer, but the years are shorter!
From: jfox@hooksett.East.Sun.COM (John Fox - SunExpress IR)
Newsgroups: sci.electronics
Subject: Re: Barking
Date: 15 Dec 1992 14:24:38 GMT
Organization: Sun Microsystems, Inc.
Distribution: world
Reply-To: jfox@hooksett.East.Sun.COM
NNTP-Posting-Host: hooksett.east.sun.com

In article @rpi.edu, mellob@cary103.its.rpi.edu (Brett A. Mellor) writes:
>
>  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
>
>
Thanks for the reference Brett - now to find a newstand that carries them. Any
idea in the So. NH, Northern MA area?


> Dear Mr. Fox, Why are the SunStations so much slower than the IBM AIX 
>		terminals?

Hmmm. Aerodynamics perhaps?  :-)





John

























Newsgroups: sci.electronics
From: tomv@s23.msi.umn.edu (Tom Varghese)
Subject: Plans for HiFi amp/preamp etc...
Summary: Looking for sources/plans for hi quality, hi power amps .....
Organization: University of Minnesota
Date: Tue, 15 Dec 1992 23:54:16 GMT


Anybody out there know of a good source for plans to build HiFi amps/preamps 
etc., I am looking to build a high power (100-200Watt) amplifier, a tube or FET
or hybrid would be great...... 


A good source for speakers/kits/plans would be appreciated too.

Thanks


Tom Varghese
tomv@s1.msi.umn.edu

Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: How does EEG's work?
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 14 Dec 1992 18:53:09 GMT

Eric Cantrell (cantrell@sauron.msfc.nasa.gov) wrote:

: 3) I know that EKG's use some kind of dual precision amplifiers, does EEG's
: pretty much use the same scheme?

If you build the amplifier with opamps, you need THREE opamps to make a
instrumental-amplifier with symmetrical high-input-impedance. But there are
integrated instrumental-amplifier too.

Bye Thomas
Xref: sparky sci.electronics:20722 alt.radio.pirate:723
From: svaldez@sdcc13.ucsd.edu (@ocf.berkeley.edu  )
Newsgroups: sci.electronics,alt.radio.pirate
Subject: AM filters
Date: 15 Dec 92 00:02:13 GMT
Followup-To: poster


  I'm experimenting with a transmitter for the AM (.5-1.7 MHz)
commerical broadcast band and would like to design filters to
prevent high emissions on the fundamental and harmonic frequencies.
I'll probably gravitate towards a frequency in the upper end of the
band (1450-1700 kHz).

  Can someone recommend filter designs which can handle several
watts of power? This can't be too hard yet I'm not an EE major so
I need formulas/design instructions, etc...  Thanks.

svaldez@sdcc13.ucsd.edu
From: svp@po.CWRU.Edu (Scott V. Pasternak)
Newsgroups: sci.electronics
Subject: How do you set up a security system?
Date: 12 Dec 1992 05:41:12 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: svp@po.CWRU.Edu (Scott V. Pasternak)
NNTP-Posting-Host: thor.ins.cwru.edu


I am trying to get some surplus parts that I recently bought to work as a
home security system.  I am using a RADIONICS Omegalarm D1112 system with
the wall controller (a keypad that controls it..).  At first, I couldn't
get it to stop alarming, then, I got it to go to a state of "NOT READY
TO ARM" by putting 1K Ohm resistors across all the zone inputs (as the 
schematic on the unit showed, and applying a Low to the Disable/Reset input.
Then it says "Preparing to arm... Not ready to arm"...  (which may be because
I am powering it from it's alternate power source right now...)  But when 
it is working, how do I change the code or enter a new one????  It keeps asking
for the old code (to silence the alarm), and I don't have this....  Is it
hard-coded on a chip when it is reset or does it default to some easy
to use number...  Any ideas????

Scott Pasternak
svp@po.cwru.edu
-- 
Newsgroups: sci.electronics
From: schuster@panix.com (Michael Schuster)
Subject: Re: Best nicads??
Date: Sat, 12 Dec 1992 13:10:21 GMT
Organization: PANIX Public Access Unix & Internet, NYC
Keywords: nicad

In article <rich.724149537@pencil> rich@pencil.cs.missouri.edu (Rich Winkel) writes:
>In <1992Dec10.083347.10926@hemlock.cray.com> n3022@cray.com (Jim Knoll) writes:
>>Can someone tell me if there is a possible FAQ that rates the
>>different manufacturers of nicad batteries according to quality,
>>power output, etc.?
>
>Consumer Reports ran an article on batteries about a year ago, I think
>it was nov 91.  They tested standard, alkaline and nicad batteries.
>I seem to recall radio shack (gasp) had among the best nicads, especially
>in the D size, which were something like twice the capacity of all other
>D sized nicads.  The reason is that other brands' D nicads were actually
>C sized nicads camouflaged in D cases.
>Well worth reading.

Are you sure the Radio Shack endorsement didn't just apply to their alkaline
cells? The Radio Shack D nicads are =AA= cells in D cases!


-- 
_______________________________Mike Schuster________________________________
NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
The Portal (R) System: schuster@shell.portal.com | MCI Mail,GEnie: MSCHUSTER
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: gary@ke4zv.uucp (Gary Coffman)
Subject: Re: Flywheel batteries as EV power source
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Gannett Technologies Group
Date: Fri, 18 Dec 1992 15:24:28 GMT

In article <1gp2pdINN680@usenet.INS.CWRU.Edu> bj368@cleveland.Freenet.Edu (Mike E. Romano) writes:
>
>This flywheel discussion is interesting.
>I am not an engineer but note it was mentioned that a proper
>size flywheel can store the energy/power of a v8 engine.
>
>What is the simple equation here for energy (horsepower) stored
>in say a flywheel weighing 200 pounds, spinning at  1000 rpm?
>My last physics course was in high school.

Horsepower is, unsurprisingly, a measure of power not energy. A
viable unit for energy is the horsepower-hour, or the kWh. Using
the SI unit makes many calculations easier, but the magnitude is
sometimes hard to grasp intuitively for people used to English
units. 1 hp-hr = 0.74570 kWh or a horsepower is about 3/4 of a
kilowatt.

To calculate the energy stored in a flywheel, you need to know
it's mass, the distribution of that mass, and the rpm. If we assume
a 100 kg mass M as a point 1 meter R from the rotational center, then
the energy in rotating the mass is  

E=2*pi*R*M*(60*RPM)^2/3600
or in this case
2*pi*1*100*(60*1000)^2/3600=628318530.7J=174.55 kWh=232.73 hp-hr
or the energy equivalent of 0.73 gallons of gasoline.

Gary 
Xref: sparky sci.electronics:21022 sci.energy:6217 rec.autos.tech:16838
From: pnelson@cobra.Tymnet.COM (Phil Nelson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 22:26:00 GMT
Followup-To: sci.electronics
Organization: BT North America (Tymnet)

In article <1992Dec17.173946.5374@adobe.com> pngai@adobe.com (Phil Ngai) writes:
>In article <BzE2oz.I4H@ns1.nodak.edu> csmith@plains.NoDak.edu (Carl Smith) writes:


>>>Unless you wrap the flywheel in a massive enough container that it can absorb
>>>all that energy without vaporizing, you're going to have an explosion.
>>
>>Why bother, we don't wrap our gas tanks in a container that would contain
>>their explosion?
>
>Because gas tanks don't explode. Movies are not reality.

Neither is usenet speculation. But consider the opportunity presented here
to engineer a case of life imitating art (that is, if you call movies about
expoding cars art). If we can just convince everyone that flywheel powered
cars must necessarily be explosive, perhaps it will become self-fulfilling
prophecy, and any flywheel powered cars built will be explosive. Just like
in the movies. Won't the scriptwriters be pleased? Or will they?


BTW, isn't anyone going to answer my question about the temperature gauge
with no numbers? If no one can tell me how cold the coolant is when the
gauge stays at the bottom of the "normal range", I might actually have to
find out for myself ;-).


Phil Nelson . pnelson@tymix.tymnet.com . San Jose, CA, USA . 408-922-7508

	The first to present his case seems right,
	  till another comes forward and questions him.    Proverbs 18:17
Newsgroups: sci.electronics
From: mcfearin@convex.com (Lee Mcfearin)
Subject: Re: Is there a FAQ file for sci.electronics?
Date: Fri, 11 Dec 1992 20:11:36 GMT
Distribution: usa
Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
X-Disclaimer: This message was written by a user at CONVEX Computer
              Corp. The opinions expressed are those of the user and
              not necessarily those of CONVEX.

jbs4930@usl.edu (Scott Jeffrey B) writes:

>If there is, could someone please e-mail it to me or
>tell me where I might be able to ftp it?

>Thanks

me, too.

thanks,
lee
--
lee

{uiucdcs,smu}!convex!mcfearin
These opinions are MINE, MINE, MINE!!!   -but you can borrow them if you wish.
From: smithr@teecs.UUCP (Robert Smith)
Date: Mon, 14 Dec 1992 20:49:56 GMT
Subject: Re: Re: How can a radar detector bedetected?
Organization: Litton Systems, Toronto ONT
Newsgroups: sci.electronics

Yes, a radar detector can be detected. The local oscillator produces
F1, F2, F1+F2 and F1-F2. Although a very small amount of energy is
transmitted, it can be detected. In the UK where a licence is required
to operate a receiver this is the method they use to find illegal
TV sets.

Bob.
Xref: sparky sci.electronics:21001 sci.energy:6208 rec.autos.tech:16825
From: pngai@adobe.com (Phil Ngai)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 17:44:09 GMT
Organization: Adobe Systems Incorporated

In article <1gp6lkINNik@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
>In article <1gp2pdINN680@usenet.INS.CWRU.Edu>, bj368@cleveland.Freenet.Edu
>(Mike E. Romano) writes:
>
>=This flywheel discussion is interesting.
>=I am not an engineer but note it was mentioned that a proper
>=size flywheel can store the energy/power of a v8 engine.
>=
>=What is the simple equation here for energy (horsepower) stored
>=in say a flywheel weighing 200 pounds, spinning at  1000 rpm?
>=My last physics course was in high school.
>
>First:  Horsepower is a unit of power (energy delivered per unit time), not of
>energy.  Second, the amount of energy stored in a flywheel is dependent on the
>geometry of the flywheel as well as its mass and its speed.  The energy stored
>goes as the product of the moment of inertia and the square of the frequency at
>which it's spinning.

Carl:

It's not horsepower that counts, it's torque.

:-)

-- 
My opinions are my own.
Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: Railroad crossing gates -the ups and downs???
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Sat, 19 Dec 1992 19:13:17 GMT

drx@chinet.chi.il.us (Scott Whittle) writes:
>Ok I'll bite.  How does the railroad control the crossing gates?  Here in
>Illinois, Chicago and NorthWestern changed over the technology at the
>crossings about 2 years ago and have had major problems ever since.  Gates
>come down and stay down without a coming locomotive.  Once I watch the gates
>come down when the train (albeit moving about 3mpg) was about 25 feet from the
>intersection.  

>I've also noticed that commuter trains will cause the about 5 gates to come
>down ahead, but a freighter will only bring down 3 ahead.  Anybody will
>any knowledge they would like to share???

      I've seen an ad for a "smart" gate controller that takes data from
multiple points along the track, determines speed, and decides how far in
advance to lower the gate on that basis.  General Railroad Signal, I think.
This is a big advantage on track which has both fast trains (requiring
that the gates go down far in advance) and switching movements (where
nearby trains may move around slowly for considerable periods without
threatening the crossing).

      I've heard the saying "never buy signalling gear from somebody who's
in a better climate than you are".  Most of the old-line companies are in
upstate NY or PA.  Some of the newer stuff comes from places where ice,
snow, salt, heavy plows, and switch heaters aren't part of everyday life.
This creates problems.

					John Nagle
Newsgroups: sci.electronics
From: pecampbe@mtu.edu (Paul Campbell)
Subject: Re: Very sharp RF notch filter sought
Organization: Michigan Technological University
Date: Tue, 15 Dec 1992 00:39:19 GMT

In article <1992Dec14.064445.9591@ips.oz.au> bruce@ips.oz.au (Bruce Paterson) writes:
>I need a VERY sharp notch filter (or actually 3, if sharp enough) to reject
>FM broadcast stations from an antenna signal. The requirements are tough:
>a. VERY sharp - I need to measure spectra of broadband noiselike signals and
>the present LC filters make a far too visible hole.
>b. No other holes (or even ripples) in the pass band - 57 to 180MHz.
>c. Low loss.
>
>LC type circuits are not sharp enough. Using a crystal is out as it is too
>lossy and has many other smaller holes. A carefully made cavity may be the
>answer, but while I can find many ways to use a cavity to reject one
>frequency and pass another (standard diplexers), I can't see how to use one
>to only reject a frequency, while passing all others. Any help?

Try searching for these:
	Monolithic crystal filters..several crystal pairs on a single
substrate to increase both the steepness and get rid of the worst ripples
	SAW (Surface Acoustic Wave) filters..similar to crystal filters,
but one of the variants may be what you need.

Or, try a different method. Mix the signal you are measuring down to say 10.7
MHz where sharper filters are available. Not only that, but you can
specifically exclude any frequency you want by not mixing it down. You could
mix directly to baseband, too, for that matter.

The only requirement is to build yourself a good PLL frequency synthesizer
circuit to generate the wide range of freqeuncies that you'll need.
Newsgroups: sci.electronics,rec.audio,alt.guitar,rec.music.makers.guitar
From: pquince@blacks.jpl.nasa.gov (Peter Quince)
Subject: Re: Tube amp transformers
Keywords: tubes transformers
Organization: Image Analysis Systems Group, JPL
Date: Mon, 14 Dec 1992 19:40:22 GMT

npstewar@eos.ncsu.edu (NATHAN PHILLIP STEWART) writes:

>3) About measuring plate voltage, it occured to me that if the impedance of 
>   my voltmeter is not high enough I could fry my voltmeter and quite possibly
>   more (me for instance.)  Is this a real concern, or do Multimeters generally
>   have a high enough impedance that I don't need to worry.

yeah, what I generally do is suspend the multimeter probe from a fulcrum and allow it
to swing down and make contact with the plate.  Sometimes I just throw the probe 
at the appropriate wire or contact and watch the meter deflection.  Another method
which makes good contact is to contrive to click the probe against the 
metal in such a way as to cause it to arc weld itself in place.  Then take the
measurement, turn off the source, and pry the probe off.  For line voltage I
usually jam a few bobby pins into the wall socket with a tack hammer and measure 
off of those.  Also, teeth are good insulators so I find that chewing the insulation
off of zip cord is the easiest and safest way to get at the wire if you are unsure
whether or not it is hot, as long as you watch your lips.

peter 'let me help you' quince
--


Newsgroups: sci.electronics
From: jmorriso@ee.ubc.ca (John Paul Morrison)
Subject: MC68hc705K1: can I disable reading the ROM?
Organization: University of BC, Electrical Engineering
Date: Tue, 15 Dec 1992 03:29:25 GMT


I can't find this in the manual.

I'm wondering if there is a way to disable reading back
the contents of the CPU ROM (in the '05) so people can't 
read it, copy etc. IS there a bit I can blast after verifying
the part?

jpm

-- 
__________________________________________________________________________
 John Paul Morrison                     |  
 University of British Columbia, Canada |  
 Electrical Engineering                 |   .sig file without a cause
 jmorriso@ee.ubc.ca              VE7JPM |  
________________________________________|_________________________________
Newsgroups: sci.electronics
From: hyu@eng.umd.edu (Henry K. Yu)
Subject: How to pulse the step motor 55SI-25DAWD
Date: Mon, 14 Dec 92 16:58:19 GMT
Organization: Project GLUE, University of Maryland, College Park
Distribution: na

I would like to learn a set-up to pulse the following step motor:
	55SI-25DAWD
	7.5DEG.36 Ohm
	15Dec83DA
It has six leads:
	2 Red
	1 Black
	1 Yellow
	1 Orange
	1 Brown

Please email to hyu@eng.umd.edu .
Much thanks in advance,
hyu
Newsgroups: sci.electronics