HDTenEightyP/NetNews huggingface dataset:
From: greg@cherokee.NoSubdomain.NoDomain (Greg Moritz)
Subject: Re: Flywheel batteries as EV power source
Reply-To: greg@cherokee.b23b.ingr.com (Greg Moritz)
Organization: Dazix, An Intergraph Company
Date: Fri, 18 Dec 1992 17:18:50 GMT

| In article <1992Dec17.010235.986@cmkrnl.com>, jeh@cmkrnl.com writes:
| 
| > And even if the container does hold, we're not out of the woods yet.  
| > If the container doesn't break, it is because it is able to absorb 
| > the energy.  Which means that the energy STILL gets turned into heat 
| > -- it's just that it isn't enough heat to break the container.  
| > The container, nonetheless, is going to get damned hot.  
| > 
| > The only way around this is to make the container so sturdy that the 
| > flywheel keeps spinning in the worst collision imaginable. 

How big of a container are we talking about in this flywheel thread?

I have heard talk of flywheels that contain enough energy to move a
car from a standing start (?) to 100 mph.  This seems like a tremendous
quantity of energy from a spinning device.

I assume that a flywheel is cylindrically shaped.  I have only heard 
descriptions of what they do and that they make EV's more competitive
with gasoline-powered cars.  I have never seen a technical drawing.

I'm not even sure that they exist at all.  Are any regenerative flywheels
in use today other than on test vehicles that cost hundreds of thousands
of dollars?
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: Power supply for chips
Date: Sat, 19 Dec 92 13:05:18 GMT
Reply-To: paula@nlbbs.uucp
Distribution: world
Organization: The Electronics Workbench - Cumberland Maine

        You need to be a little more specific...I assume you are playing
        with CMOS. Which IC are you using?

        9 volts should be fine and CMOS doesn't take a lot of current.
        All unused inputs must be tied either high or low. Pull-up or
        pull-down resistors on the used inputs are a good idea, too.

        Don Lancaster's "CMOS Cookbook" is a great source of help for
        learning to fiddle around. I'm pretty sure JAMECO and many other
        electronics outlets has it.

        * * * * * * * * * * * * * *  * * * * * * * * * * * * * * *
	*   Paula Stockholm              paula@nlbbs.UUCP        *
	*  Cumberland, Maine          !nlbbs!paula@uunet.uu.net  *
	* * *  * * * * * * * * * * * * * * * * * * * * * * * * * * 

Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: Opamp Based Integrator
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 14 Dec 1992 18:44:17 GMT

Kong Kritayakirana (kong@leland.Stanford.EDU) wrote:

: 1. I don't need an opamp with awesome slew rate to make an integrator, right?

That's not so easy! The large-signal-bandwidth is given by maximum output-
voltageswing and the slew-rate. So, you must know the maximum outputfre-
quency the integrator must work with which amplitude.

Formula:	dU out  |
		------  |     =   2 * PI * f * Upeak out
	  	  dt    |max  

The opamp internal slew-rate must be higher than the slew-rate given by
your integrator! That's important for precission. If you want a highprecis-
sion integrator for dymamics you should take an opamp with a slew-rate
what is 10 times faster than the "slew-rate" of your integrator.



: 2. How do I deal with Voffset problem.

If the opamp has no offsetcompensation-inputs, you must use the noninverting-
input of the opamp. The deviation of this input from ground compensate the
the offsetvoltage. You can make the offsetcompensation adjustable by a pot-
meter with low voltagerange.



: 3. This is going to be used in a high precision, low noise data acquisition.
:    The professor I work for doesn't know anything about electronics, but he
:    WANTS LOWEST POSSIBLE noise. What opamp should I use for Vinput with band
:    width of about 500kHz. The circuit is NOT a power circuit.

For very less noise:	It's dependet from sourceimpedance and the used
			opamp. For high-imp. it's better opamp with fet-
			input-stage, for low-imp. take such with bipolar
			pnp-input-stage. The first case, it dominate the
			input-voltage-noise and in the second case it domi-
			nate the input-current-noise which generate a vol-
			tage-noise in the source-impedance. 

Back to the slew-rate:	With a sinus-frequency of 500 kHz and a output-
			voltage-swing of 10 V peak you must take a opamp
			with 30 Volt per microsecond or more. And don't
			forget you first question. Now you can give the 
			answer of your question. You need really a fast 
			opamp!


So I hope I can help you. But I think the better way for you is to learn
about this stuff from good electronics-book.

Bye Thomas
Newsgroups: sci.electronics
From: andyw@aspen32.cray.com (Andy Warner)
Subject: Barcode question.
Originator: andyw@aspen32
Keywords: FACT-1, barcode
Organization: Cray Research, Inc.
Date: 15 Dec 92 14:09:45 CST


I would like to ask a question on behalf of a friend without news
access. He is looking for more information on a standard used
in barcoding called "FACT-1 Data Identifier Standard", it is
referenced by the draft ANSI standard MH10.8M-199X. The ANSI
standard explains only 6 of these identifiers (which are used as
prefixes to other codes, and identify what the remainder of
the code means).

FACT stands for "Federation of Automated Coding Technologies", and
they are based in Pittsburgh, PA. A call to directory assistance
resulted in a number with a "sorry our voice mail system is
full" message !

If anyone can shed any light on this standard, preferably
in electronic form, I'd appreciate it (actually, my friend
would appreciate it more !)..

Thanks,
-- 
andyw.	N0REN/G1XRL

andyw@aspen.cray.com	Andy Warner, Cray Research, Inc.	(612) 683-5835
Newsgroups: sci.electronics
From: barr@tramp.Colorado.EDU (BARR DOUG)
Subject: Transmission line question
Organization: University of Colorado, Boulder
Date: Tue, 15 Dec 1992 20:20:04 GMT

Some specs I have call for ethernet coax to be grounded in one location
and one location only! I am wondering why this is. Antenna effects,
current loops or something else. Does anyone know why this is the case?

Newsgroups: sci.electronics
From: say@monashee.sfu.ca (Daniel Say)
Subject: Ferrite Toroids and Baluns. Help
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Fri, 18 Dec 1992 05:01:52 GMT

Passing on a message.  Can anyone here help?
--------------------------------------------------
 Ferrite Toroids and Baluns                     15 Dec 92 00:34
I'm posting these questions for a more technologically astute friend who
doesn't have Internet access.  I hope you can help him, because I don't even
understand the questions!

1) Could ferrite toroids by Amidon (FT-82-75) with high permeability
(5000) be used to build a low pass audio filter with cut-off frequency of
3 kHz (-3dB)?  Specified resonant circut frequency is 1 kHz - 1 MHz for
this material.

2.) What kind of balun is used in professional dipole set-up, for
listening only?  Is it voltage or current 1:1 type?

                            Cheers, Rob
--
Robert Fargher  fargher@unixg.ubc.ca |  The number of things that I know
Dept. of Physiology, UBC             |  absolutely nothing about is increasing
Vancouver, BC, Canada, V6T 1Z3       |  at an alarming rate!
Newsgroups: sci.electronics
Subject: <None>
From: ** Sender Unknown **
Date: 16 Dec 92 05:24:26 +1000

From: mellob@cary115.its.rpi.edu (Wyle E. Coyote)
Subject: magazines
Reply-To: mellob@rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy, NY.
Date: Tue, 15 Dec 1992 23:38:54 GMT

 to: Mr. Fox, my mail server isn't finding your address 

  Well, Mr. Fox, The only time I buy a magazine from a newsstand
        is when I've never read one before. If I like the magazine, I
        subscribe. That way, I don't have to go get it. And because they
        (magazine) have it delivered to my door for me, I get a discount
        off the "annual newsstand price." I'm sure you've heard that before.

            But anyways, I live in Saugus, MA, right next to Lynn. Maybe
        you've heard of it? Reading and Greeting carries the whole nine
        yards. i.e.: Pop Comm, Pop Elec, Radio Elec, CQ, and that other
        one that CQ Communications publishes (slipped my mind.) B. Dalton
        Bookstores carry electronics magazines and in addition to that they
        actually stock technical books. I bought "Understanding Electronics"
        and my "Passport to World Band Radio" at B. Daltons.

            You may also want to try You-Do-It Electronics in Needham. Las
        time I was there they had a modest selection.


        Radio Electronics
        Subscription Service
        P.O. Box 51866
        Boulder, CO. 80321-1866
        1-800-999-7139 for subscription

        Popular Electronics
        Subscription Dept.
        P.O. Box 338
        Mt. Morris, IL. 61054-9935

        Popular Communications
        76 North Broadway
        Hicksville, N.Y. 11801-9962

        Monitoring Times
        P.O. Box 98
        Brasstown, N.C. 28902
        1-800-438-8155

        Oh yeah Pop Elec# 1-800-435-0715, and Pop Comm# 516-681-2922

       Brett A. Mellor
	Rensselaer Polytechnic Institute
From: jhwhit01@ulkyvx.louisville.edu
Newsgroups: sci.electronics
Subject: Re: Ranking the Electronic magazines.
Date: 13 Dec 92 05:44:32 GMT
Organization: University of Louisville

In article <sehari.724185381@class1.iastate.edu>, sehari@iastate.edu (Babak Sehari) writes:
> ---
> 
> I have red many electronics magazines.  I found each has some advantages
> and some short comings.  Here I would like to post it here.  I hope others
> also share their thoughts about their electronics magazines:
 
One that has been recommended to me, but I have not seen it, is ComputerCraft.
It is called "the practical magazine for personal computers & microcontrollers."
It was formerly a hobbiest electronics magazine called "Modern Electronics."
Maybe someone here will be able to give us a better description.
 
Jeff White    jhwhit01@ulkyvx.bitnet
From: walsh@optilink.COM (Mark Walsh)
Newsgroups: sci.electronics
Subject: Re: Best nicads??
Date: 14 Dec 92 23:49:26 GMT
Organization: Optilink Corporation, Petaluma, CA

From article <1992Dec12.131021.19612@panix.com>, by schuster@panix.com (Michael Schuster):
> In article <rich.724149537@pencil> rich@pencil.cs.missouri.edu (Rich Winkel) writes:

#>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!

From the 1993 Radio Shack catalog:

Size      Amp hours
----------------------
D         1.250
C         1.250
9V        0.065
AA        0.650
AAA       0.180
N         0.150
-- 
Mark Walsh (walsh@optilink) -- UUCP: uunet!optilink!walsh
AOL: BigCookie -- Amateur Radio: KM6XU@WX3K -- USCF: L10861
"What, me worry?" - William M. Gaines, 1922-1992
Newsgroups: sci.electronics
From: rky57514@uxa.cso.uiuc.edu (Tall Cool One )
Subject: PADS library listing?  Anyone got it?
Organization: University of Illinois at Urbana
Date: Sun, 13 Dec 1992 02:01:29 GMT

Hi,

	I remember seeing a listing of all the components provided with the
PADS shareware.  I finally got PADS to work on my machine and would like to
see what components are available to me.  If someone has this listing, please
email it to me or repost.  Thanks!



 _I_______________________________________________________________________I_
(_@_)                                                                   (_@_)
|   |   Raymond Yeung               Internet: Nimbus@uiuc.edu           |   |
|   |                                         rky57514@uxa.cso.uiuc.edu |   |
|   |   EE student at the                                               |   |
|   |   University of Illinois    CompuServe: 70700,1011                |   |
|   |   at Urbana-Champaign                                             |   |
(___)-------------------------------------------------------------------(___)
  I                                                                       I
From: dag@col.hp.com (David Geiser)
Newsgroups: sci.electronics
Subject: Re: "dumb" pagers
Date: 15 Dec 1992 23:18:36 GMT
Organization: HP Colorado Springs Division
NNTP-Posting-Host: hplsdor.col.hp.com

Thousands of boxes for many years?  Thousands of pagers, each with
a unique code and a battery shelf life of many years?


Why not just barcode each box and let a computer keep track of where
they are.  Inventory would be pretty easy to automate.



Newsgroups: sci.electronics
From: jgd@dixie.com (John De Armond)
Subject: Re: Very sharp RF notch filter sought
Date: Thu, 17 Dec 92 10:40:25 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

josemj1@aplmail.jhuapl.edu (Marshall Jose) 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.

>In regard to the "open-stub" notch that someone else suggested, I suppose
>it is something inexpensively verified, although my calculations told me
>that the notch width will be too broad for the application. It will remove
>a TV channel but will obliterate a large portion of the FM broadcast band

Depends on the Q of the transmission line.  If very high quality coax,
hardline or even better, air hardline is used for the stub, it will be 
quite narrow.  My worry would be in making it too narrow for the 
fairly wideband FM signal.  For 2-way work, where the bandwidth is
much less, a piece of 1" CATV coax works just fine to notch out offending
intereference.

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine(TM) | Interested in high tech and computers? 
Marietta, Ga                         | Send ur snail-mail address to 
jgd@dixie.com                        | perform@dixie.com for a free sample mag
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
From: tell@rukbat.cs.unc.edu (Stephen Tell)
Newsgroups: sci.electronics
Subject: Re: Looking for MC3363
Date: 16 Dec 92 21:53:49 GMT
Distribution: usa
Organization: The University of North Carolina at Chapel Hill

In article <1992Dec16.051912.411@ssc.com> markz@ssc.com (Mark Zenier) writes:

>What sort of luck have "just normal people" had with distributors
>that take credit cards and have semi-reasonable minimums like
>Arrow, Allied and Newark?

>Mark Zenier  markz@ssc.wa.com  

I've had perfectly reasonable success with Newark from either faxing
or phoning in small credit card orders.  Their $25 minimum is no worse than
Jameco et. al.  

Often somthing you want is out of stock and takes a long time (sometimes
infinite) to arrive.  I've never been billed for anything that hasn't shown
up.  Sometimes the order is split between different warehouse sites, meaning
multiple boxes and credit card charges.
-- 
Steve Tell       tell@cs.unc.edu H: 919 968 1792  | #5L Estes Park apts
UNC Chapel Hill Computer Science W: 919 962 1845  | Carrboro NC 27510
Engineering is a _lot_ like art:  Some circuits are like lyric poems, some
are like army manuals, and some are like The Hitchhiker's Guide to the Galaxy..
Newsgroups: sci.electronics
From: Ed_Meyer@mindlink.bc.ca (Ed Meyer)
Subject: Re: Flywheel batteries as EV power source
Organization: MIND LINK! - British Columbia, Canada
Date: Thu, 17 Dec 1992 18:24:12 GMT

> Andrew J. Huang writes:
>
> Msg-ID: <1992Dec16.192456.6261@news.cs.brandeis.edu>
> Posted: Wed, 16 Dec 1992 19:24:5
>
> Org.  : Brandeis University
>
> In article <1992Dec15.194558.2556@adobe.com> pngai@adobe.com (Phil Ngai)
> writes:
> <regarding flywheel energy storage>
> >But how hot would this "cotton" be? You're dumping what is presumably
> >the equivalent of several gallons of gasoline's worth of energy.
> >That's a very large amount of energy.
> >
>
> :::
>
> 1. I think that it is unfair to call it "such a dangerous technology"
> based solely on your own opinions, without having done any
> investigation on your own.
>
> :::
>
> flywheel "charged" and you can get power, economy, cleanliness and range.
>
> -andy
>

Andy,

just to add to your points, somewhere I read about a company (I think it's in
the Pacific Northwest) that has perfected a contra-rotating, magnetic-bearing
flywheel system which effectively eliminates the gyro-effects and has a very
high energy density too.  Sorry, but I can't remember where I saw the article
so treat my info with a "grain of salt" until you or others can verify it.

Cheers,
          Ed Meyer

Xref: sparky sci.electronics:21254 sci.energy:6306 rec.autos.tech:16990
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source ( And Other Sources )
Date: 21 Dec 1992 02:08:45 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 <1992Dec21.010417.11854@cis.ohio-state.edu>, rubin@grape.cis.ohio-state.edu (Daniel Rubin) writes:
>This discussion has reminded of a solution to our potable energy problems.
>This ideal is probably as useful as when I though of my perpetual motion 
>magnet motor which could never work, but I will throw it out anyways...
>
>Solar cells work by using photons to knock out electrons in a silicon crystal
>structure correct?  Now I am wondering if something could be make to use
>the same principle of "knocking" electrons around using cosmic rays?  If you
>developed such a material you could sandwich it with a thin layer of a 
>radio active substance hence producing a battery that would literally last
>a lifetime.  If this solar cell substance worked as efficiently as current
>solar cells and could produce .5 volts and say 1 amp for a 4 inch square 
>sheet.  You could make a nice 12 volt cell that would be about 4 inches square
>and maybe 1 inch heigh that would produce power for a long long time.  

Well, there are problems.  This radioactive substance is emitting particles. 
Such particles tend to have adverse effects on the crystal structure of
semiconductor devices.

>Of course it would have to be enclosed in lead or something to protect the
>users from the radioactivity, but that can be done I believe...

You'd have to have a substantial amount of activity in the device for it to be
useful as an electrical source.  Enough activity that were the container
breached (e.g., in a house fire), desctruction of a single "battery" would
almost certainly violate existing guidelines for dealing with radioactive
substances.
--------------------------------------------------------------------------------
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
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Subject: Re: Basic bench equipment query
News-Software: VAX/VMS VNEWS 1.41    
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
Date: Tue, 15 Dec 1992 21:08:00 GMT

In article <BzB8rD.BDp@hfglobe.intel.com>, dcovell@hfglobe.intel.com (David Covell) writes...
> 
>I'm preparing to outfit myself with a basic bench setup, ie scope, function
>generator, power supply, DMM, and transistor tester (lots of in-circuit
>go/no go testing). As always when I begin to shop for things I start with

	Although we don't quite reach the high end of scopes etc, we do run the
	gaumut from very simple to complex computer controlled scopes. Cheap
	to very complex DMM's etc. For home/most service requirements, in our
	estimate, KISS.

	We have some esoteric measurements we have to do where accuracy is very
	much required. These procedures take a lot of time and fancy equipment.
	For those cases, we roll out the humongous hardware, roll up our sleeves,
	and prepare to spend some time really taking data.

	Over the weekend, I did some trouble-shooting on an older stereo amp.
	(Damn, Knight Kit filter caps tend to dry out after 25 years or so.)
	I didn't need precision measurement technics, all I needed was a go-
	no-go indication of was the power supply ripple .05 volts, .5 volts,
	or 5 volts.

	Some other suggestions.

	In circuit transistors testers. - Sometimes they do, sometimes they
	don't. We've got a couple, but they are not often used.

	Component signature analyzer. - Probably the most important device
	after a scope and dmm. Especially wonderful tool for servicing a
	stereo, (or any other unit,) where you can compare good/bad circuits.

	Capacitor analyzers. - Can get fooled by parallel circuits. Simplest
	analyzer is a box of assorted caps, 2 clip leads, and insulated fingers
	(for higher voltages.)

   Frank R. Borger - Physicist    __       Internet:  Frank@rover.uchicago.edu
Michael Reese - Univ. of Chicago |___      Phone : 312-791-8075 fax : 567-7455
  Center for Radiation Therapy   | |_) _   
                                   | \|_)  Faith is believing what you know
    "Birthplace of Softball"          |_)  ain't so. - Mark Twain
Newsgroups: sci.electronics
From: strohm@mksol.dseg.ti.com (john r strohm)
Subject: Re: charging question
Organization: Texas Instruments, Inc
Date: Thu, 17 Dec 1992 19:13:23 GMT

In article <BzEqn6.JMv@cck.coventry.ac.uk> lsg001@cck.coventry.ac.uk (Graham Wilson) writes:
>
>If you have a bank of 12 volt batteries of 500 amp capacity, what is the 
>highest amp hour charge you can put into the batteries without cooking
>them ?
>
>Is there are a formula for working this out ?
>
>Thanks.
>
>         *********************************************************
>         *      Graham Wilson      *  lsg001@cck.coventry.ac.uk  *
>         *     LL.B.  Law  III     *     Coventry  University    *
>         *********************************************************

Major misconception here, Graham.  There are three major parameters for
batteries and battery-like energy storage devices:  Voltage, Current
capability, and storage capacity.  These are measured, for batteries, in
volts, amperes (usually abbreviated to amps), and ampere-hours (amp-hrs).

For example, a typical automotive battery will be rated for 12 volts, 500
to 1000 amps cold-cranking current, and 160 amp-hrs.

Furthermore, you have to take the intended application of the battery into
account.  Automotive batteries are generally intended to sit idle most of the
time, then deliver up a SIGNIFICANT amount of their capacity (but nowhere near
all of it) in a few seconds.  Deep discharge (running it all the way down
cranking a car that won't start) can damage the battery.  Marine (trolling
motor) batteries, on the other hand, are designed to be run all or nearly all
the way down, at a low-moderate current.  Demanding outrageous currents out
of them will not do them any good at all.

Finally, the manufacturer of the battery will have designed the battery for
a recommended charging current.  Trying to charge it at significantly different
rates is ALSO not a good idea.

Rule of thumb: the designer of the battery probably knew what he/she was doing
when he/she specified the intended use of the battery, and the designer of
the system that USES the battery probably knew what he/she was doing when
he/she chose the battery in it.  If you want to do something significantly
different, make certain you aren't shooting yourself in the foot.

Newsgroups: sci.electronics