HDTenEightyP/NetNews huggingface dataset:
From: rsnider@xrtll.uucp (Richard Snider)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 20 Dec 92 03:51:42 GMT
Organization: WCOM Public Access Unix - Toronto

In article <1992Dec17.011649.987@cmkrnl.com> jeh@cmkrnl.com writes:
>In article <1992Dec16.192456.6261@news.cs.brandeis.edu>,
> andyh@chaos.cs.brandeis.edu (Andrew J. Huang) writes:
>> <I have to admit an emotional response to this since I think that
>> flywheels have tremendous potential.>
>
>The flywheel is a great way to store mechanical energy.  However I'm not
>certain about the means for using it.  Somehow the energy must be gotten 

[...Stuff about generation of electricity deleted....]

>Maybe hydraulics?  Hydraulic "motors" have the same great torque as electrics

[...Stuff about using hydraulics to get stuff in and out of the wheel del..]

>Maybe the greatest thing about the flywheel is that, if you design the system
>right, you brake by turning the system back on itself and pumping energy back
>into the flywheel.  (This can be made to work for battery-powered electric cars

I have not followed this thread from the beggining, however I shall add
my two cents worth.   

I belive the hydraulic flywheel had been tried for temporary storage
of power reclaimed from braking.  It was tried in some busses (much
stop and go sort of thing), the problem was not in the energy transfer
but more in the flywheel concept.  When the bus tried to corner one
way, it hugged the road better than ever, but when it cornered the other
way, it tried to flip itself.  I know... use 2 counter-rotating flywheels
and this will solve that problem. It dosn't solve the problem of what
happens when something hits the flywheel and you end up with 8 parts of
it (or more) all travelling in oposite directions at about Mach 5.

I personally would like to see  large flywheel storage of energy in
vehicals, but I don't think it will happen, the flywheel is better suited
to energy storage in stationary conditions.

                                                          .....Rich
                                                          rsnider@xrtll
Newsgroups: sci.electronics
From: gw214790@LANCE.ColoState.Edu (Galen Watts)
Subject: Re: Switching speakers on during loud volumes
Date: Tue, 15 Dec 1992 21:48:44 GMT
Organization: Colorado Concert Sound

In article <sehari.724447297@class1.iastate.edu> sehari@iastate.edu (Babak Sehari) writes:
>In <Bz6nyz.LF4@acsu.buffalo.edu> v064mb9k@ubvmsd.cc.buffalo.edu (NEIL GANDLER) writes:
>> I am designing a device that disconnects a pair of speakers from a
>>stereo recevier when the phone rings. But when the phone is eventually
>>hung up m afraid that suddenly switching back a pair of speakers with a
>>relay during high volumes can sort of "overwhelm" a pair of
>>sepakers and could in fact in the long run cause damage or destroy
>>them especially the woofer. Can someone confirm this. I would appreciate
>>any help. Thanks
>Put a low pass filter before your speakers.  That is find out what is
>the highest frequency of your speaker, then design a low pass filter
>that does not let higher frequencies damage your speaker, at the same

I would strongly suugest NOT putting in a lowpass.  The crossover in the
speaker will protect the woofer.  The low pass filter may cause strange 
things to happen to your freq and phase response.

It would be better to put a relay in one of the tape monitor loops (or inside
your preamp in the signal line, but only at hi-impedance points) that needs a
manual reset, so it doesn't blast back on when you hang up.  

The only problem with switching back on from dead silence is if your amp has
DC in with the speaker level signal.  DC will cause a wide spectrum pulse
(otherwise known as a "click")  that may blow your tweets, crossover caps, etc.
Otherwise, (no DC) switching on is no worse than a big transient in the music,
like power chords, kick drum, screams.....

Good Luck,
Galen Watts

Newsgroups: sci.electronics
From: dougs@david.wheaton.edu (Doug Smith - SGA)
Subject: Re: Sony control L
Organization: Wheaton College
Date: Wed, 16 Dec 1992 22:27:46 GMT

In article <1992Dec16.134451.24828@uwasa.fi> tep@uwasa.fi (Timo Pitkaranta) writes:
>Ed (ee89jje%ee.surrey.ac.uk) wrote:
>: 
>: Does anyone know where I can find details of Sony control L?
>
>The only information I have got is here: A couple of years ago Sony
>used round 5-pin connector for the same purpose as now popular 2.5 mm 
>minijack, which is nowadays in Sony camcorders. That info I got from
>Sony Finland who promised to send me a adapter cable to convert from 5-pin
>to 2.5 mm minijack! (I have not received one yet - but hope soon!) 
>
>If anubody gets info and specs I am interested too !

I ordered the specs from Sony.  The document is pretty cryptic and lacking
in practical detail.  It only shows the 5-pin connector.

dougs@sga.uucp
...wheaton.wheaton.edu!sga!dougs

Newsgroups: sci.electronics
From: drx@chinet.chi.il.us (Scott Whittle)
Subject: Railroad crossing gates -the ups and downs???
Organization: Chinet - Public Access UNIX
Date: Fri, 18 Dec 1992 19:36:17 GMT

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???

scott
.

-- 
Scott Whittle (drx)                       drx@chinet.chi.il.us
Ground Zero Sight & Sound, inc.          
Two Wheaton Center #1111         * Ding-a-Ding-Dang my Dang-a-long-ling-long 
Wheaton, IL 60187 708.533.7471   * Ministry, JBMH, as edited by IceIce Beno  
Xref: sparky sci.electronics:21233 sci.energy:6291 rec.autos.tech:16972
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 20 Dec 92 19:30:36 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <72023@cup.portal.com> Ted_Eugene_Viens@cup.portal.com writes:

|   Now let us look at a minimal electric vehicle with current technology.  
|Probably a sub-compact with a strong light-weight chassis, a lot of light-weigh
|t 
|materials, batteries, and two electric motors on the rear wheels.  This would 
|give it 40 Horsepower.

All those fancy light weight materials are going to cost big bucks.  Are you
going to sell your house so you can buy this little beastie.

-- 
Mob rule doesn't become any prettier, just because the mob start to call itself
a government.
It ain't charity if you are using someone else's money.
Mark.Wilson@AtlantaGA.NCR.com
Newsgroups: sci.electronics,rec.audio,alt.guitar,rec.music.makers.guitar
From: jrusmise@ee.ubc.ca (RUSMISEL JASON DIRK)
Subject:  Electric Guitar Pickups? 
Keywords: guitar pickups
Organization: University of BC, Electrical Engineering
Date: Mon, 14 Dec 1992 19:13:08 GMT


	I was wondering if anyone could explain just how the pickups in 
an electric guitar work?  I understand the electromagnetic theory behind 
them. 
	I'm looking for practical information on the sort of voltages
that amplifiers expect to see, impedance of a guitar, what are active
pickups, how are the pickups oriented?

	I'd appreciate any responses either posted or mailed whatever you
prefer.



Thanks



Jason Rusmisel
UBC Electrical Engineering
From: jfox@hooksett.East.Sun.COM (John Fox - SunExpress IR)
Newsgroups: sci.electronics
Subject: Re: DESPERATE for anti-bark device...
Date: 14 Dec 1992 16:23:36 GMT
Organization: Sun Microsystems, Inc.
Distribution: world
Reply-To: jfox@hooksett.East.Sun.COM
NNTP-Posting-Host: hooksett.east.sun.com

In article 288200047@trsvax, pauls@trsvax.tandy.com () writes:
>
>Baretta 92F with 250 grain hollow points.
>




In article 20131@magnus.acs.ohio-state.edu, acampane@magnus.acs.ohio-state.edu (Angelo Campanella) writes:
>In your particular case, I would suggest you either sweet talk the neighbor to 
>turn on his light at dusk, or for you to aim one in the dog's direction in
>place of it.  Dogs are very territorial, but they also can be very neurotic.
>
>Be thankful that you have identified his pacifier!



This is sci.electronics, right?  Don't tell me you all can't come up with a
simple way to generate a 40khz signal? That's all the original author is
asking for.


John
















Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: CD Virus?  :-)
Organization: Motorola Computer Group, Tempe, Az.
Distribution: usa
Date: Thu, 17 Dec 1992 15:46:56 GMT

I have a Fisher CD player which worked well for 4 years. About two
weeks ago, it developed a problem. When you insert a disk, it spins
it up and then flashes "DISK" on the display. It's acting like it
can not tell it has a disk in the drive. I cleaned the optics and
everything else I could think uf but no change. I put it on a shelf
and figured I'd get around to ordering a service manual.

About a week ago, my sister called and asked If I'd come look at her
stereo. Turns out the problem was with the CD player. It just kept
flashing "DISK" on the display. I told her to hold on to it and when
I figured mine out, I'd fix hers.

Yesterday, my boss asked if I'd mind looking at his CD player, a late
model Emerson. Seems that when you install a disk, (see it coming?)
it just flashes "DISK" on the display.

Now, I can live without my player for a long time. I can also deal
with my sisters nagging. However, since the last unit belongs to my boss,
solving the problem is now a higher priority.

Does anybody have any clues or hints as to what might be going on here?
It really looks virus-esque but I believe this must be some common
failure mode for inexpensive CD players.


Thank You
John

-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Newsgroups: sci.electronics
From: acampane@magnus.acs.ohio-state.edu (Angelo Campanella)
Subject: Re: Need source for large (>30,000 uF) caps.
Organization: The Ohio State University
Date: Fri, 18 Dec 1992 03:36:13 GMT




For such large capacitances, have you thought of using a storage battery?

The battery need not have much current capacity, since it functions only to 
smooth the voltage.
From: garyg@Warren.MENTORG.COM (Gary Gendel)
Newsgroups: sci.electronics
Subject: Re: DOES AMERICA SAY YES TO JAPAN? - Off t
Date: 17 Dec 1992 19:13:10 GMT
Organization: Mentor Graphics, IC Group
Distribution: world
Reply-To: garyg@Warren.MENTORG.COM
NNTP-Posting-Host: garyg.warren.mentorg.com

In article 7IH@news.cso.uiuc.edu, irvine@uxh.cso.uiuc.edu (Brent Irvine) writes:
>> Americans probably buy most Japanese products because there no longer
>>is any choice. TV? VCR? CD? STEREO? Are there any of these made in the
>>US?
>>  No.
>
>RCA TVs 19" and larger are designed and made in the US.

Ah! The RCA saga.  Here's where American business knowhow really shines.  RCA
suffered some really hard times in the 70's ending with the Capacitive Disk Video
efforts.  At that time CEO Bradshaw decided to get RCA back to its electronics roots.
Part of this meant buying a CMOS process from Japan.  Note that RCA pioneered CMOS
and SOS and is sometimes called the father of CMOS. As the 80's progressed, the
semiconductor industry, especially ASICS, were in a downhill slide.  The RCA
Semicustom Division bucked this trend by developing Design Automation tools years
ahead of the industry.  In '85 GE took over RCA in order to get NBC.  GE hacked RCA
into pieces and sold it off to any one who was interested.  RCA consumer products
went to SGS Thompson of France, etc...  The RCA Design Automation group scattered
with the close of the Semiconductor Division by Harris.  GE kept NBC and the
Aerospace/Military divisions.  They have recently sold off everything but NBC,
which they are looking for a buyer.  The bottom line is that a growing multi-billion
world-competitive organization was snuffed out, not by the Japanese, but pure
American greed.  Talk to any employee of RCA at the time, I believe the majority
would be still happy to be working at RCA.  I certainly would be.

Yes, France's SGS Thompson (RCA) manufactures TVs in the US... very good ones from
the tradition of excellence spawned from the RCA heritage.

Gary Gendel




Newsgroups: sci.electronics
From: rick@cs.sunysb.edu (Richard Spanbauer)
Subject: Re: Ranking the Electronic magazines.
Organization: State University of New York, Stony Brook
Date: Sun, 13 Dec 1992 01:02:36 GMT

In article <625@thunder.LakeheadU.Ca> dnwangus@flash.LakeheadU.Ca (Dave Angus) writes:
>In article <sehari.724185381@class1.iastate.edu> sehari@iastate.edu (Babak Sehari) writes:
>Electronics and        In between a trade     UK only?
>Wireless World         journal and a popular
>		       magazine.  Projects 
>		       tend not to have pcb
>		       layouts, as if they
>		       are provided more to
>		       illustrate a point. 
>                       Good theory in less
>		       depth than IEEE journals.
>		       Older issues were much 
>		       meatier, on a par with
>		       journals.

	Actually, Electronics & Wireless World is available both via
	subscription ($116/yr via airmail) and on the newstand.  I buy
	a copy every month from our Bassett Books - dunno whether Bassett
	is a chain or not.  EWW is well worth any effort it takes to
	get it.  Wish we had a magazine like this published in the US.

>Dave Angus

				Rick Spanbauer, SUNY/Stony Brook
From: Ted_Eugene_Viens@cup.portal.com
Newsgroups: sci.electronics
Subject: Re: PLESSY ZN459CP pinout required
Date: Fri, 18 Dec 92 19:07:18 PST
Organization: The Portal System (TM)

>I urgently require the pinout for a PLESSY ZN459CP video amp
>thanks in advance
>Bruce
>
Strange, Bruce, but my Plessey databook refers to the ZN459CP as an
'Ultra Low Noise Wideband Preamplifier' never the less:

	Output Earth--1    8--Output Earth
	Supply  +Vs --2    7--Output
	   Input    --3    6--Output Earth
	Input  Earth--4    5--Decoupling

Hope this helps...  Ted..
From: gkwan@balboa.eng.uci.edu (Greg Kwan)
Subject: Re: Ranking the Electronic magazines.
Newsgroups: sci.electronics
Organization: University of California, Irvine
Date: 21 Dec 92 06:35:07 GMT

In article <1992Dec15.000315.13857@ssc.com> markz@ssc.com (Mark Zenier) writes:
>In article <sehari.724185381@class1.iastate.edu> you wrote:
>: I have read 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:
>
>: Radio-Electronics    Some practical       Few new ideas,
>
>And now renamed to Electronics Now.

I still think it's just about the best hobbyist magazine around. I read
it at the library.

>Here are some more that I haven't seen mentioned yet.
>
>>Nuts and Volts       

Available free at some electronics stores. I used to make a point of
picking it up every month... been kinda lazy lately.

>Trade Press magazines.

These are where you really learn stuff. (Well, these and data/
application books.)

>>Electronics Design
>>EDN

These and EE Times are, IMHO, essential. Add EDN's News and Careers
magazine, too--good for job hunting. As an indicator of how controlled
the subscriptions are, I blew off renewing Electronics Design for a
couple of months. They really do terminate your subscription. Most
others will eventually stop sending you the RENEW NOW! notices. Not
them.

[BTW, I subscribed when I was a design engineer. They are quite
selective--read ``forget it if you're a student''. Most university
libraries will have subscriptions, though.]

>>Electronics Products

If you're a subscriber, they'll mail you a four volume selection
guide. Haven't used it much, but it looks somewhat useful--like
IC Master.

Possibly add ECN, although it covers similar territory.

>>Personal Engineering and Instrumentation News.

Yeah, I like this mag, too. Plus grad students qualify (I origi-
nally subscribed as a design engineer but renewed as a graduate
student, no prob.)

I get a bunch more, but they're more specialized (e.g. Test and
Measurement World--great for learning about neat new ``toys''
you need to convince your boss you need and Embedded Systems
Programming--for the ucontroller crowd).

greg
Newsgroups: sci.electronics
From: rpmackin@student.business.uwo.ca (Robert Patrick MacKin)
Subject: FOR SALE: INTERSIL ICL7106CPL A/D converter for LCD
Organization: University of Western Ontario
Date: Wed, 16 Dec 1992 14:19:43 GMT

I have 20 of these ( INTERSIL ICL7106CPL ) and I don't need them
They are A/D converters with LCD driver built in.
Very commonly used in LCD meters, etc.., great for projects.
$10.00 each, 3 for $20.00. ( plus $1.00 to mail them, Can/USA. ( or SASE ))
Bought them in an auction. ( repair center closing )
Sold a bunch locally, but have 20 more to get rid of.
Either EMAIL me or call/fax 519 472 7194 in London, Ont.
Thanks...


rpmackin@student.business.uwo.ca (Robert Patrick MacKin)
Western Business School  --  London, Ontario
From: markey@flash.ATC.Olivetti.Com (Tim Markey)
Newsgroups: sci.electronics
Subject: Re: IR Remotes
Keywords: IR
Date: 16 Dec 92 17:50:37 GMT
Distribution: usa


      The November edition of Electronics Now (Radio Electronics) has an
    article on how to build both an IR transmitter and receiver.  A kit
    can be ordered with parts and two boards for about $52.00.  The article
    also goes into detail on how the signal is generated.  I just received
    mine last week and I'm in the process of putting it together.  They 
    can be ordered via Fred Eady, PO Box 541222, Merrit Island, FL 32954.
    I have no affiliation with either Electronics Now or Fred Eady.

    Tim Markey

Xref: sparky sci.electronics:21248 sci.energy:6303 rec.autos.tech:16985
From: rubin@grape.cis.ohio-state.edu (Daniel Rubin)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source ( And Other Sources )
Date: 21 Dec 92 01:04:17 GMT
Organization: The Ohio State University Dept. of Computer and Info. Science

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.  

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...

OK shoot holes thorough this idea...

								- Dan
-- 

             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!
From: alee@ecs.umass.edu
Newsgroups: sci.electronics
Subject: Re: how many pins on a 486 chip??
Date: 19 Dec 92 12:42:31 GMT

There are 168 pins on the 486 microprocessor.

Al

Newsgroups: sci.electronics
From: cgordon@vpnet.chi.il.us (gordon hlavenka)
Subject: Re: CD Virus?  : -)
Organization: Vpnet Public Access
Distribution: usa
Date: Fri, 18 Dec 1992 04:41:59 GMT

CD players use a laser diode to read the disk.  The player detects the
presence of a disk by simply checking to see if it can read data.  No
data == no disk.  Unfortunately, these laser diodes have a lifespan of
four or five years.  Tired diode == no data.  Guess what?

(It may be possible to crank up the drive current on the laser diode
but this will only postpone the inevitable.  See back issues of R-E
maybe three years ago for details...)

-- 
----------------------------------------------------
Gordon S. Hlavenka           cgordon@vpnet.chi.il.us
Vote straight ticket Procrastination party Dec. 3rd!
From: root@cv.vortex.com (The Superuser)
Newsgroups: sci.electronics
Subject: Re: What are the threshold levels for RS-232?
Keywords: RS232 voltage
Date: 14 Dec 92 04:27:23 GMT
Organization: Vortex Technology, Topanga, CA, U.S.A.

Greetings.  The RS232 standard was superseded by the EIA-232D standard.  It
specifies a driver minimum output range of +/-5V and a maximum of +/-15V.
Receiver input sensitivity is spec'd at +/-3V.  There are single chip
driver/receiver solutions that will provide an acceptable +/- swing from
only a single +5V for 232D.  There are also chips that use a single 3.3V
supply to implement the lower voltage EIA/TIA-562 standard, which defines
> +3V as a 0, and < -3 as a 1.  This standard can be interoperated with 232D
interfaces.  See the Maxim chip series for a wide range of such devices.

--Lauren--
Newsgroups: sci.electronics
From: mark stephens <stephens@kong.gsfc.nasa.gov>
Subject: Re: How to measure humidity
X-Xxmessage-Id: <A74E88800701EC3D@mstephens.gsfc.nasa.gov>
X-Xxdate: Fri, 11 Dec 92 18:03:44 GMT
Organization: NASA/GSFC
X-Useragent: Nuntius v1.1.1d12
Date: Fri, 11 Dec 92 23:02:19 GMT

Thanks from the original poster for all those responces....  I'll look up
the parts for the humidity sensing devices, I'm sure our VLSI lab has the
right catalogs.  Hope they come with some specs (I'm mostly new to this
field) and an example schematic would be terrific (especially the one
from Ohmic Instruments, how I turn variable capacitance into a voltage is
a tab beyond me at the moment).

I (being a former meterologist) knew about wet and dry bulb thermometers.
 One reason I did not want to use this is the life forms in the terrarium
are very dependent on a correct humitidy level.  If the wet part ever
dried out so would the frogs 'n plants as there would be no difference in
temperatures and the curcuit would think 100%RH (right?)!  Supplying
water is the problem here.  Also, at the high humidities (85-95%) found
in the tank, the differenece between wet and dry is not great (ie, not a
lot of water is evaporating) so that the accuracy is not great.  

But hey,  don't stop the ideas!

   mark