HDTenEightyP/NetNews huggingface dataset:
From: jeh@cmkrnl.com
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 24 Dec 92 05:45:51 GMT
Organization: Kernel Mode Consulting, San Diego, CA

In article <1992Dec23.081415.4647@adobe.com>, pngai@adobe.com (Phil Ngai)
 writes:
> In article <1992Dec21.193621.12001@microware.com> troyf@microware.com (Troy Frericks) writes:
>>Modern composit materials, when used in a flywheel, will disintegrate
>>with such a failuar.  This bomb would be about as wonderful as some
>>fiber-glass insulation falling out of your attic.
> 
> I repeat my offer to all the liberal arts majors participating in this
> discussion. Surely a gas is even softer and less harmful than "fluff".
> Allow me to subject your hand to the flame of a welding torch and then
> we can continue to talk about how dangerous "fluff" can be.

Yup.  

Reminds me of a guy I once knew who insisted that Newton's Third Law was wrong.
If for every action there is an equal and opposite reaction, he said, then when
you fire a gun the gun will hurt you just as much as the bullet hurts the
target. 

I took him through F=ma and k.e.=0.5m(v**2) and did the arithmetic to show that
the bullet gets the vast bulk of the energy by virtue of having less mass to
accelerate... but this wasn't convincing.  He just couldn't accept that Newton
was talking about "force", which is a precisely defined thing, not "action",
and that equal force applied did not mean equal energy imparted. 

Nor did he think that the area over which the recoil was spread was relevant.

Yep, he was a liberal arts major.  

I offered to shoot him as part of a demonstration, but he declined. 

	--- 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
From: canright@convex.com (Robert Canright)
Subject: Signal Integrity: crosstalk, reflections, etc.
Date: Mon, 28 Dec 1992 16:42:10 GMT
Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
Keywords: crosstalk reflections noise
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.

I posted a query a while ago asking if anyone in this newsgroup
was interested in signal integrity & I got a few responses that
fell into 2 catagories:
1) "I know nothing about it but am interested, please tell me."
2) Professionals who asked "What do you have in mind?"

For those who want some introductory info on the subject, sometime in
the next month I will post a list of recommended papers on the topic, 
and maybe a few books.

To the professionals:
My philosophy is that signal integrity does not so much contribute to
profits as shields the company from financial loses due to noise
problems.  I believe that the companies benefit from small, lean
engineering groups in signal integrity & that the signal integrity
tasks are best dealt with by professionals that focus on the topic.

With my previous employer I had to do mechanical design, thermal 
design & signal integrity (SI), so I know it is not always possible to 
focus on SI. With my new employer I do get to focus on SI.  It has been
my experience that I profit from sharing ideas with other professionals
in SI.  I am new to newsgroups & nets like this & am curious about the 
potential for the beneficial sharing of information.  If your engineering
group is small then it can be beneficial to have someone outside the 
company to talk with.

After all, crosstalk & reflections have been known for over 20 years, but
there are still a lot of unresolved issues/problems in this field.

Also, what about a grassroots movement to change some of the hardware
standards to make our life a little easier?  If some of the integrated
circuits were designed differently, we could get rid of some termination
resistors.  But that would require agreement on the circuit board
impedance.  Now, the way changes like this are made is by committees of 
engineers who have the budget & time to travel to committee meetings.
Do we have to spend money to improve our lot?  Can we organize through
the nets?

This is what I had in mind.

Bob Canright
canright@convex.com

Newsgroups: sci.electronics
From: snydert@dmapub.dma.org (Tony Snyder)
Subject: ADDS Viewpoint 78 terminal
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]
Date: Wed, 23 Dec 1992 14:18:39 GMT

I have recently obtained an ADDS Viewpoint 78 terminal (VP-78) an have no 
information by which to put this thing to use.  It is an, at least, 
somewhat intellegent terminal, having no "dip" switches for configuration.
I want to put this thing to use as soon as possible, but can not figure out
even how to set the baud rate.
	If anyone out there can supply any information on setting up this
thing or, even possibly, provide some documentation, I will be greatly 
appreciative. 
	Please respond here as I have no access to mail.  
                    Thanks in advance
                      Tony Snyder 
Xref: sparky sci.electronics:21412 sci.energy:6368 rec.autos.tech:17075
From: choy@skorpio.usask.ca (I am a terminator.)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 22 Dec 1992 19:41:38 GMT
Organization: University of Saskatchewan, Saskatoon, Canada
Distribution: world
NNTP-Posting-Host: skorpio.usask.ca

In article <1goebdINNik@gap.caltech.edu>, 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.

The particles will fly off linearly, but what if the housing surrounding the
flywheel was turning? Then the breaking flywheel may just cause the housing
to turn faster. The flywheel particle momentum is lost with a less
forceful impact (prolonged impact) because the turning housing is moving at
a lower speed relative to the flywheel particles (which in turn move at a
lower speed relative to the housing). It's a flywheel inside a flywheel inside
a flywheel.

What has four wheels and flies?

-- 

Henry Choy
choy@cs.usask.ca

Hey kids, start jumping up and down like idiots.

Looking for LOG for a good price?

Dial 1-800-byBLAMO !!!!

"Log rolls down stairs. Rolls over in pairs. 
 Rolls over your neighbor's dog.
 It's good for a snack. It fits on your back.
 It's LOG LOG LOG!!!!"

             -- Ren * Stimpy
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: gerard@progress.COM (Gerard Bras)
Subject: Re: DC Motor RFI, was Flywheel batteries as EV power source
Organization: Progress Software Corp.
Date: Tue, 22 Dec 1992 18:45:38 GMT

Hi y'all

I hate to break the gripping excitrement of the is/isn't dabate thats raging
but a week or so back someone(s) posted about DC motors with very high power
output in small packages.  I lost the  post and have to confess that I lack
the stamina to wade back through this discussion.

The post implied that these are real devices and (possibly) available for purchase.

If so, where and what are costs like?

So, whoever you were that tried to interject practicality, can you help
me out?

thanks,
gerard

Xref: sparky sci.electronics:21661 sci.energy:6480 rec.autos:30629
From: stead@skadi.CSS.GOV (Richard Stead)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 29 Dec 92 00:27:52 GMT
Followup-To: sci.energy

In article <1992Dec23.180140.7552@enterprise.rdd.lmsc.lockheed.com>,  writes:
> The tensile strength of carbon carbon fibers is currently > 1 million psi,
> the producers won't tell you the real numbers as this field is very competative.
> This means that if a carbon carbon composite is 80% fiber the tensile strength
> of the composite is 800 kpsi.  The ultimate tensile strength is the tensile
> strength of the graphite plane, meaning one has made a perfect single crystal
> coiled graphite sheet fiber.  This perfect fiber would have a tensile strength
> greater than that of perfect diamond which is 14 million psi.

Ok.  Let's make a great big flywheel to give the flywheelers the benefit
of the doubt.  We'll make it 1 meter in radius - that's mighty big to fit
in a car.  We'll assume the rotor weighs in at 100 kg.  Pretty doggone heavy.
We'll assume that the rotor is a cylindrical shell infinitesimally thin.
This is the configuration for minimum stress and maximum energy.  (It means
that there are no spokes, etc., but we'll assume that the designers are
brilliant and can suspend this ring, spin it up and pull power off it).
In this case, energy is easy, it's just 0.5 * M * R^2 * da/dt^2.  The energy
in 2 gallons of gas is 92,000 kCal, and I feel this is reasonable to
get their supercar the 600 miles that they claim for range.  a is angle in
radians.  This results in 442 revolutions per second (2.8 km/s, probably
larger than the sound speed of the composite).  The radial stress is
not very important here, the hoop stress is larger.  The hoop stress in
this case is just rho * da/dt^2 * R^2.  rho is density.  I don't know
the density of carbon composite, but it is considered light, so I'll
give it 2 g/cc (I don't think it floats).  Thus, hoop stress is 2240 kpsi.
Thus, the flywheel will fly apart before it can store the
requisite energy.  Given diamond, a flawless flywheel would hold
together at this immense size, probably a bit impractical, but I
will not say that it will remain impractical.  However, reduce that
wheel in size just a little, and the diamond, too, will fly apart
before it could be spun fast enough to store the required energy.


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
Newsgroups: sci.electronics,misc.wanted
From: danr@ais.org (Daniel Romanchik)
Subject: Re: WANTED: Receiving tube manual...
Organization: UMCC
Date: Sun, 27 Dec 1992 19:16:23 GMT

In article <1h7553INNjrk@fmsrl5.srl.ford.com> krouth@slee01.srl.ford.com (Kevin Routh) writes:
>
>I'd like to get a copy of an old receiving tube manual, maybe RCA.  If
>someone has one collecting dust, please e-mail me.  I really don't want
>to pay too much, however.  Thanks.
>

Kevin:
   I recently bought one at the book sale put on by the Friends of teh
Ann Arbor Public Library.  The Friends hold these sales on Saturdays
and Sundays at the main library downtown during the school year.
Paperbacks are only 50 cents;  that's all I paid for mine.  So, if
you're ever out this way, stop by the library.

Regards, Dan

PS. I originally tried mailing you, but the mail bounced for some
reason.
Xref: sparky sci.electronics:21545 sci.energy:6442 rec.autos:30487
From: frank@marvin.contex.com (Frank Perdicaro)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 23 Dec 92 15:44:34 GMT
Followup-To: sci.electronics
Organization: Xyvision Design Systems

In article <72055@cup.portal.com> lordSnooty@cup.portal.com (Andrew - Palfreyman) writes:
>Frank E Perdicaro writes:
>: As an interesting side light, the largest forging ever made is 
>: the largest flywheel ever that stores energy at MIT for the 
>: ALCATORC-MOD fusion reactor.  It takes like 500 hp all night to spin it up, 
>: and 3 seconds to stop when the switch is flipped.  
>: 
>: Yeah, megajoules, many of them.  If there was a quake when the thing
>: was spinning, it would remove a large section of Cambridge.  
>: 
>: Its surface speed is just below the speed of sound, and it weighs like
>: a very large steam locomotive ; and its right next to the FISSION
>: reactor..... they know there is no way to stop it if there is a quake,
>: so its just in a simple flimsy building.
>
>I have a problem with this; if v^2 ~= 1e5 (m/s)^2 and you've pumped in
>about 3MJ, the mass must be about 60Kg for a disc shape. Perhaps the speed
>is not nearly so high - this is hardly a locomotive weight!
>(Hint: use Disc Energy = 0.5m(r*w)^2 and 1hp = 764W).
>

Why would v be 1e5?  I thought the speed of sound in air was about
250 m/s, about 2.5e2.

Perhaps I got the spinup time wrong.  The thing is designed to spin
just below the speed of sound, and is a piece of Inconel something
like 6 feet thick and a dozen feet across.  It is connected to "line"
generator -- 13,600 VAC 3p.

The flywheel weighs more than the generator.

When the magnet is fired, the repulsion between the poles is enough to
bend a forged, 1 meter thick, 3 meter diameter piece of stainless
steel about 3 mm in something like a micro second.  And fuse a volume
of hydrogen.  Use that as a energy reference.

An interesting automotive aspect of this project is the plasma
production.  How do you make an arc several feet long in hydrogen?
With the worlds largest set of points!  The ballast resistor consists
of 1 meter by 2 meter sheets of 1/2" stainless sawn zig-zag, connected
by fiberglass rails.  The stack of these sheets is about 20 feet long.
The inductor is common 10" high pressure water pipe wrapped with something
like 20-O copper cable.  The capacitor(condensor)/switch(points) setup is 
about the size of my house.  The ballast resistor gains 100 Kelvins in a
millisecond.

Once the hydrogen is plasma, the switch is flipped, and something like
300,000,000 amps at 0.5 vdc goes to the magnet.

As we ( the American taxpayer ) have paid for all this, it is open to
the public by appointement.  The gallery with photos of much that I
have described is amost alwyas open.  There are some flywheel experts
around that can definitly settle this question.
-- 
	 Frank E Perdicaro, Systems Admin, etc.		Xyvision Color Systems
      Legalize guns, drugs and cash...today.		101 Edgewater Drive
   inhouse: frank@marvin, x5572				Wakefield MA
outhouse: frank@contex.com, 617-245-4100x5572		018801285
Newsgroups: sci.electronics
From: c9112151@cc.newcastle.edu.au (Paul A Watters)
Subject: Rohm BA1404 Data Sheets 
Organization: University of Newcastle, AUSTRALIA
Date: Sun, 3 Jan 1993 22:55:57 GMT

Would anyone with data sheets or information on the BA1404 IC
produced by Rohm Corporation Japan, mail me at the following
address: pwatters@hiplab.newcastle.edu.au.

Thanks in advance.

Paul Watters
From: behnke@FNALF.FNAL.GOV
Newsgroups: sci.electronics
Subject: HELP I.D. THESE PARTS
Date: 29 Dec 92 16:29:52 GMT
Reply-To: behnke@FNALF.FNAL.GOV
Organization: Fermi National Accelerator Lab
NNTP-Posting-Host: fnalf.fnal.gov

Hello all;

 Hoping SOMEONE out there can help me find the parameters of the following
diodes:

1N7450A		SM2323		11-10715-00 (DEC)	11-15272-00 (DEC)
IR701		SM2314		UES602R
D672		1N9148		HD500

 I also have the following IC's I need to Identify:

FBT016		L8091239	MC367G		MC853		MC1004P
NC260		7710393		2605-03		760HC		4701/VF
4702/VF		232 CPE		19-14438-00 (DEC)	21-13954-00 (DEC)

Please e-mail to me if possible, as I don't get a chance to log onto the net
very often.

Mike "This dang 27GB database is going to be my death" Behnke
Fermi National Accelerator Laboratory
P.O.B. 500-369
Batavia, Il., U.S.A., 60510
(708) 840-2700 (voice)
(708) 840-8208 (fax)
My opinions are my own, and MOST of them don't mean a thing !

mb
From: alex@anat3d1.anatomy.upenn.edu (Alex Shrom)
Newsgroups: sci.electronics
Subject: Re: RF transmitters, cellular phones
Date: 27 Dec 92 19:36:17 GMT
Organization: University of Pennsylvania

In article <103212@netnews.upenn.edu> alex@anat3d1.anatomy.upenn.edu (Alex Shrom) writes:
>
>for me. I would appreciate transmitters powered both by batteries and
>by phone line current (while still allowing normal operation of the
>phone).

[stuff deleted]

>
>	Thanks in advance--leave all replies here.
>

	Recently there was some confusion as to what I meant by a
transmitter powered by phone line current. I want to build a
transmitter which gets its power and its input signal from a phone
line while allowing normal operation of the phone (or relatively so).
I have seen them in magazines, but I should be able to throw one
together for far less than they charge.
From: pngai@adobe.com (Phil Ngai)
Newsgroups: sci.electronics
Subject: Re: Query: What are pseudo-static RAMS?
Date: 21 Dec 92 17:58:24 GMT
Organization: Adobe Systems Incorporated

In article <1992Dec18.190317.917@cc.gatech.edu> byron@cc.gatech.edu (Byron A Jeff) writes:
>That's not my understanding now. The Pseudo-statics I have seen have to be 
>explicitly refreshed by pulling OE low. This fortuatly is easily done by
>the microprocessor using the part. And the best thing is the long (very
>long) refresh interval of 32 ms for 2048 rows. That's only 3 times a second.

No. 32 ms is 31.25 times a second, unless you're using a different
definition of ms than I am.

-- 
My opinions are my own.
Xref: sparky sci.electronics:21659 sci.energy:6479 rec.autos.tech:17200
From: stead@skadi.CSS.GOV (Richard Stead)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 28 Dec 92 23:52:20 GMT
Followup-To: sci.energy

In article <7003@otc.otca.oz>, elson@otc.otca.oz.au (Elson Markwick) writes:
> energy.  Why not tap that and use it for recharging the flywheel?

Good post overall.  But I would answer your question with another -
Why not tap the energy and use it recharging a battery?
Batteries are well-characterized, very safe and stable; and they are
off-the-shelf technology.  They will probably beat a flywheel pound-for-pound
in storage capacity, once flywheel shielding is taken into account.  They
suffer leakage current losses, but those are much less than the Q losses
for a flywheel.  And they will not introduce torque stresses onto the vehicle
frame on every turn (flywheels will, even if mounted with opposing spins
so that the vehicle as a whole is not spun).


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
Xref: sparky sci.electronics:21315 sci.energy:6327 rec.autos.tech:17025
From: choy@skorpio.usask.ca (I am a terminator.)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 21 Dec 1992 21:07:18 GMT
Organization: University of Saskatchewan, Saskatoon, Canada
Distribution: world
NNTP-Posting-Host: skorpio.usask.ca

In article <1992Dec17.210539.7875@adobe.com>, pngai@adobe.com (Phil Ngai) writes:
|> Flywheels will EXPLODE! if their vacuum containment is breached or
|> bearings fail.

There's a linear accelerator nearby. The concept is to accelerate electrons
to several hundred MeV in 10^-5 torr. I suppose some kinetic energy is
stored. Oh there's a radiation problem....

How about an elevator? You crank up a weight and let it drop when you want to
accelerate and when you decelerate, you crank it up again. You can mount a
sail on the mast too. Then you can tell your friends you have a yacht.

-- 

Henry Choy
choy@cs.usask.ca

Hey kids, start jumping up and down like idiots.

Looking for LOG for a good price?

Dial 1-800-byBLAMO !!!!

"Log rolls down stairs. Rolls over in pairs. 
 Rolls over your neighbor's dog.
 It's good for a snack. It fits on your back.
 It's LOG LOG LOG!!!!"

             -- Ren * Stimpy
Xref: sparky sci.electronics:21471 sci.energy:6407 rec.autos:30406
From: pngai@adobe.com (Phil Ngai)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 23 Dec 92 08:14:15 GMT
Organization: Adobe Systems Incorporated

In article <1992Dec21.193621.12001@microware.com> troyf@microware.com (Troy Frericks) writes:
>Modern composit materials, when used in a flywheel, will disintegrate
>with such a failuar.  This bomb would be about as wonderful as some
>fiber-glass insulation falling out of your attic.

I repeat my offer to all the liberal arts majors participating in this
discussion. Surely a gas is even softer and less harmful than "fluff".
Allow me to subject your hand to the flame of a welding torch and then
we can continue to talk about how dangerous "fluff" can be.

-- 
My opinions are my own.
From: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
Newsgroups: sci.electronics
Subject: Re: Walkman Modification
Date: 24 Dec 1992 21:20:48 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc10.ins.cwru.edu


	I could see modifying the tank curcuits to change the feq.
And the taking the output from the mixer to an IF amp and then
to a detector ckt. but even this would be a PAIN inside a walkman.


It would be MUCH easier to do with with a bigger radio. 


    ANT>-----------[mixer]-------------(external LO)
                     |
		     |
		   [filter, bandpass]

			
	And then from the filter to the RF input of the AM part of the
radio

-- 
A. TRENT PHILLIPS |" A mirror is a negative space with a frame and a place for
  also known as   | your face, it reveals what the rest of us see. It conceals
   WHITE  ROOK    | what you'd like you to be."--Blue Oyster Cult
-------bb099@cleveland.freenet.edu-----aa1439@freenet.lorain.oberlin.edu-------
From: choy@skorpio.usask.ca (I am a terminator.)
Newsgroups: sci.electronics
Subject: How is information stored optically?
Date: 1 Jan 1993 23:26:36 GMT
Organization: University of Saskatchewan, Saskatoon, Canada
Distribution: world
NNTP-Posting-Host: skorpio.usask.ca

How do you write to optical tape? Can you write over?
How about optical disks?

-- 

Henry Choy
choy@cs.usask.ca

  What rolls down stairs alone or in pairs
  Rolls over your neighbor's dog?
  What's great for a snack and fits on your back?
  It's Log, Log, Log!      -- "The Log Song", from Ren & Stimpy

  Math is tough!           -- Barbie
Newsgroups: sci.electronics
From: jmorriso@ee.ubc.ca (John Paul Morrison)
Subject: Re: Best way to program 68hc705 series
Organization: University of BC, Electrical Engineering
Date: Sat, 26 Dec 1992 06:52:38 GMT

In article <92360.230349DI3QC@CUNYVM.BITNET> <DI3QC@CUNYVM.BITNET> writes:
>     I am planning to do some work using motorola's 705 series probably somethi
>
>ng like the 705c9,d9 or t3. My question to anyone out there that has worked
>with this series is what is the best way to program these. Are there any ways
>to program these that dont require a programmer board and an eprom with a
>copy of the code. I would like to just have a serial programmer do the work
>from a pc. I dont want to spend any big bucks. Any suggestions or info on
>programming these controllers would be great. Thanks
>
why don't you program a 705 with serial IO code, and make a pc board with
a RAM (instead of an EPROM). You could download S records to the RAM, and then
initiate programming of the part from the RAM. A 705k1 is small and cheap
enough to handle the task. I can get 19.2 kbps on one, which is fast enough.

BTW, does anyone have a summary of the 6805, 68705 etc series? There seem
to be a lot of them. The specs in secs disk doesn't mention the 705k1, the
705j2, or the 705c9.


>
>                                                    Alex Jeannopoulos


-- 
__________________________________________________________________________
 John Paul Morrison                     |  
 University of British Columbia, Canada |  
 Electrical Engineering                 |   .sig file without a cause
 jmorriso@ee.ubc.ca              VE7JPM |  
________________________________________|_________________________________