HDTenEightyP/NetNews huggingface dataset:
From: csmith@plains.NoDak.edu (Carl Smith)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 25 Dec 92 22:27:18 GMT
Article-I.D.: ns1.Bzu6DJ.I6v
Organization: North Dakota Higher Education Computing Network

In article <1992Dec25.134459.7728@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:

>You don't understand. The gasoline *does* contain the same amount of
>energy as the flywheel, that's the whole point of the exercise. But
>liquid gasoline can't explode. Only gasoline vapor properly mixed
>with oxygen, 14:1 air/fuel ratio, can explode. 

Normally I wouldn't find fault with such an insignificant detail, but
I have seen this so many times during this tread that I thought I would
make a comment.  14:1 is the IDEAL mixture, but there is a rather wide
range over which the mixture will ignite.  Eventually it will be so rich
that it will be hard to ignite due to "lack of oxygen," and in the other
direction there can be so little gas fumes that you couldn't cause an
explosion.  You don't need perfect 14:1 to cause an explosion.
From: dougm@pnet51.orb.mn.org (Doug Mcintyre)
Newsgroups: sci.electronics
Subject: RE: CATV Block converter wanted
Date: 2 Jan 93 03:45:06 GMT
Organization: People-Net [pnet51], Minneapolis, MN.

luckey@rtfm.mlb.fl.us (Jon Luckey) writes:
>afpauls@lims02.lerc.nasa.gov (PAUL SCHWARTZ) writes:
>
>>I would like to buy a cable TV block converter, the cable converter that 
>>translates the entire cable band the UHF band.  I want to get one to use it 
>>on a TV that channels 2-6 don't work but everything else is fine.  
>
>>These block converters were very common 10 years ago.  Does any one know of 
>>any surplus places that still have them?  Or does any one have an old one 
>>that they want to unload?
>
>A friend of mine bought one of these at Walmart just a couple of years
>ago.
>
>Have you tried generic TV sources, like Dept. stores or Radio Shack?


Radio Shack dropped the block converters two years ago..

Probably about the only place you'll find one is MGM Electronics. 

MGM Electronics
650 Congress Park Dr.
Centerville, OH 45459-4072
800/543-4330 (order)
513/434-6959 (FAX)
513/434-0031 (office)

They have a $20 minimum order ($25 minimum charge)

Hmm, I can't find it listed in this catalog right here, but I don't know if
this is the current one. I remember it in a flyer I got a couple months ago. I
bought one from them before as well a couple years ago..

INET: dougm@pnet51.orb.mn.org                                GENIE: D.MCINTYRE1
Xref: sparky sci.electronics:21777 sci.energy:6520 rec.autos:30787
From: gary@ke4zv.uucp (Gary Coffman)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 31 Dec 92 01:27:27 GMT
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Destructive Testing Systems

In article <Bzu6DJ.I6v@ns1.nodak.edu> csmith@plains.NoDak.edu (Carl Smith) writes:
>In article <1992Dec25.134459.7728@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>
>>You don't understand. The gasoline *does* contain the same amount of
>>energy as the flywheel, that's the whole point of the exercise. But
>>liquid gasoline can't explode. Only gasoline vapor properly mixed
>>with oxygen, 14:1 air/fuel ratio, can explode. 
>
>Normally I wouldn't find fault with such an insignificant detail, but
>I have seen this so many times during this tread that I thought I would
>make a comment.  14:1 is the IDEAL mixture, but there is a rather wide
>range over which the mixture will ignite.  Eventually it will be so rich
>that it will be hard to ignite due to "lack of oxygen," and in the other
>direction there can be so little gas fumes that you couldn't cause an
>explosion.  You don't need perfect 14:1 to cause an explosion.

Right, only if you want a significant portion of the energy of the 
gasoline to be released do you need a stoichemetric mixture. Richer
or leaner mixtures will explode, but very inefficiently with most
of the energy released slowly in the form of smokey combustion.

Gary
-- 
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | uunet!rsiatl!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | emory!kd4nc!ke4zv!gary      
Lawrenceville, GA 30244     |                     | emory!ke4zv!gary@gatech.edu
From: schuch@phx.mcd.mot.com (John Schuch)
Newsgroups: sci.electronics
Subject: Re: help - tv remote
Date: 30 Dec 92 16:09:37 GMT
Distribution: sci
Organization: Motorola Computer Group, Tempe, Az.

In article <1992Dec29.4265.27307@dosgate> "glen mead" <glen.mead@canrem.com> writes:
>Recently I learned that a friends mother suffers from Hodgkins (sp?)
>disease.  As a result, her motor control has become very poor and she is
>having alot of trouble changing channels on her tv set.  The problem is
>that her remote control (supplied by the cable company) only gives the
>user a certain amount of time to press the required numbers to change the
>.....
>small wired remote which would give her three large buttons (one for each
>channel) to work with.  Any help would be greatly appreciated.

I guess the simplest, but most expensive solution would be to use three
cable converters and switch between them.

The least expensive, and least convienient solution would be to get a
remote which has channel up/down buttons and remote these to large
buttons. It might, however, take her an excessive amount of time to
step from say channel 4 to channel 36.

Finding a cable box or TV with three "favorite" channel settings is
probably unlikely, at least I've never seen one.

So.... I'd probably build a circuit which, after you press one button,
uses solid state switches to activate a hacked remote control
transmitter. Off the top of my head, I think it would require an
NE555 oscillator, a BCD counter (maybe a 7493), and an analog switch.
Probably have to toss in some odd gates.

John


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Xref: sparky sci.electronics:21456 sci.energy:6400 rec.autos:30393
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 23 Dec 92 13:57:02 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <1992Dec23.002833.19471@enterprise.rdd.lmsc.lockheed.com> news@enterprise.rdd.lmsc.lockheed.com writes:

>Energy has been used bending molecules, which may or may not snap back, but
>more significantly in breaking bonds which originally held the flywheel
>together.  Now if you've got the inter fiber bond strength of a material of
>carbon carbon fibers we could use for a fly wheel, your a hell of a lot 
>farther ahead that most in the carbon carbon field.  Now is this energy enough
>to make the fluff safe, I don't know, that's why I asked.  Remember that
>carbon carbon bonds are one of the strongest bonds around, thats why we
>want to use carbon carbon in the first place.  

What you have done in essence is vaporized the flywheel.  If anyone knows
the heat of vaporization of carbon-carbon please post it.

My intuition is that while it will take more energy to vaporize than does
iron, it won't absorb anywhere near enough to make a difference.

-- 
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
From: cse0239@desire.wright.edu
Newsgroups: sci.electronics
Subject: Problem with 68hc705 eval. kit
Date: 1 Jan 93 16:26:03 EST
Organization:  Wright State University 

I got the 68hc705kics kit and it seems to work correctly on everything
except blank check of the part. Has anyone had success blank checking
an erased part? 

Could this be a problem with my I/O port?


Xref: sparky sci.electronics:21729 sci.energy:6500 rec.autos.tech:17248
From: stead@skadi.CSS.GOV (Richard Stead)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 30 Dec 92 13:08:34 GMT
Followup-To: sci.energy

In article <72585@cup.portal.com>, Ted_Eugene_Viens@cup.portal.com writes:
> >Now, let's say you take 5 seconds to make a 90 degree turn.  Torque is
> >the change in angular momentum over time.  The vector direction of the
> >change in torque is tangential to the curve, and the torque is 1.414*L/5
> >or about 40,000 N-m.  How about the bopper?  Let's say he's 200 kg (big),
> >and is able to swing his body back and forth (180 degree) once a second
> >and is 2 meters tall (we'll assume he's standing, and all his weight is in his
> >head).  That's a heck of a bopper.  Ok, L=200*2*2*pi = 2500 J-s, and torque
> >would be 5000 N-m, 1/8th of the slow-rotating big flywheel in a turn
> for the FB.  I have seen 400 pound men oscillating on dance floors at more
> than 1 Hz, and if the precessional torgue was reduced by a factor of eight
> by a combination of flexible mounting and reduced rotor diameter, your treat-
> ment of this issue appears to support my original position.  Thanks for your

Not really.  I deliberately made the bopper unreasonable.  The 400 pound guy
you saw was not a massless stick 2 m long hinged at one end and with 200 kg
at the other, and oscillating a full 180 degrees.  So, let's make him more
reasonable.  he bends at the waist, so that's only 1 m; and he's more of
a cylinder in terms of mass distribution.  He also flops at most 90 degrees in
1 s, not 180.  I'll still grant that all 200 kg are in his upper body.  So this
gives L=200*1*1*pi/3 = 208 J-s, and torque is 416 N-m.  So it isn't a factor
of 8, it's a factor of 100.  Not only that, but a normal car turn takes about
1 second or less, not 5 seconds.  So it's more like a factor of 500.  The factor
of 8 was to show that even with unreasonable comparisons, the amount of
torque is about an order of magnitude different between a human swaying as
hard as they can, and the vehicle making a slow 90 degree turn.  As far as
flexible mounting goes - that only spreads the force over time - it is unlikely
to be able to spread the action over 5 seconds for a turn that took 1 s.
Thus, even with an incredible mount, you'd have to reduce the flywheel size
enough to get a factor of 100 reduction in precessional force.  The problem
is that the flywheel used for this comparison was the smallest design
at the limit of tensile strength of carbon fiber that could store the
energy equivalent of 2 gallons of gas.


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
Newsgroups: sci.electronics
From: lowry@src.honeywell.com (Dave Lowry)
Subject: Hot X-10 Module
Organization: Honeywell Systems & Research Center
Distribution: na
Date: Mon, 21 Dec 1992 15:50:30 GMT

I just installed a Radio Shack X-10 3-way switch module that is controlling
360 Watts of outside lights.  I can feel a fair amount of heat from the
module through the switchplate when the lights are on.  When off, the
module is cold.  Is this normal?

-Dave

lowry@src.honeywell.com

Newsgroups: sci.electronics
From: schuster@panix.com (Michael Schuster)
Subject: Re: Atari 5200 info wanted
Date: Tue, 22 Dec 1992 13:52:08 GMT
Organization: PANIX Public Access Unix & Internet, NYC

In article <1992Dec21.113648.1@pa621a.inland.com> delinck@pa621a.inland.com writes:
>    Does anyone know where I can get repair information (schematics, signal
>    diagrams, etc.) on the Atari 5200? Heck, I'll settle for a used Atari
>    5200 if the price is cheap. I have a SNES, but they just don't put out
>    games like Pac-man, Centepede, and Popeye any more. It may be a simple
>    problem in the swichbox.

The 5200 was basically an Atari 400 computer with 48K and no keyboard.
The PIO and sound chips were a little different, as I remember.
Sams used to publish a repair guide for the 400; perhaps you can
locate one of those as a starting point.

Many of the 5200 games were ultimately dumped to disk by pirates, and
modified to run on the 400/800/65XE/130XE computers.


-- 
_______________________________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
From: digennar@fcs280s.ncifcrf.gov (Frank S. DiGennaro)
Subject: Looking For...
Organization: Frederick Cancer Research and Development Center
Date: Wed, 23 Dec 1992 23:25:28 GMT


Thanks to everyone who answered my question concerning pulse shaping.

I need to run an 80 Mhz Sine wave into a Schmitt trigger to square
it up. The 74LS14 Schmitt trigger can't even almost handle this
speed. The 74S series chips are supposed to handle up to 125 Mhz.
The thing is, I don't even see a 74S series Schmitt trigger listed
in any of my catalogs. Does this chip exist? 

Any help would be appreciated.

Thanks

Frank DiGennaro
The National Cancer Institute
Frederick, Md.
digennar@fcs280s.ncifcrf.gov
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: jimbo@socrates.umd.edu (Jim Bogard)
Subject: Re: Flywheel batteries as EV power source
Organization: University of Maryland University College
Date: Tue, 22 Dec 1992 20:04:42 GMT

A thought or 2...

I remember reading an article in Scientific American or somesuch about
high-tech flywheels.  One of the designs that stands out in my mind
was one made of wood laminates and would store a large percentage of
its energy in deformation.  That is, the thing started out in roughly
a square shape, then as it spun up, it would flex out into the 
normal circular shape.  Recalling from Physics, as a rotating mass
moves in a shorter radius, the rotational momentum must remain 
constant, so the spinning speed increases - allowing one to tap the
power available in the return to the original shape.
Plus, it's not unappealing that the thing was constructed partially
of wood... projectiles would be easier to contain.

Has anyone considered using springs as an alternative to flywheels?
It seems to me (very topically) that while the same amount of power
could be stored in a (unknown adjective - the type of spring used
in clocks, as opposed to your screen door slammer spring) spring,
it would be much safer.
There would be no high velocity particles to contend with  -
In the event of spring breakage, or uncontrolled release, It seems that
the actual outward force would be fairly easy to contain.  In addition,
the spring material (spring steel, or some derivative thereof) could
be relatively light and less prone to cause ballistic injury.
(At least, I'd prefer it to a flywheel with the same amount of energy!)

This is interesting, keep it up.

J-.

-- 
Jim Bogard  (jimbo@socrates.umd.edu)
                                            "Implement now, tweak later."
Tech at large / gigging daemon
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Grounded Emitter Amplifier Query
Date: 30 Dec 1992 23:17:42 GMT
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <1992Dec29.214231.1135@inmet.camb.inmet.com> bwhite@cobra.camb.inmet.com (Bill White) writes:
>Hello.  I am reading Horowitz and Hill's book on Electronics, but 
>I am having trouble understanding the grounded emitter circuit.  In
>particular, I am having trouble understanding why the grounded emitter
>is not thermally stable.  I believe it, I just don't understand why

>The axioms are:
>    a The Ebers-Moll model of transistor behavior states that under
>      certain conditions conditions which establish a well-conditioned
>      environment the following two equations hold.
>
>	I_{C} = I_{S}[exp(V_{BE}/V_{T})+1]	(*)
>	I_{B} = I_{C}/h_{FE}			(**)
>
>      Where V_{T} depends on temperature, and is kT/q =
>      25mV@20degreesC, and h_{FE} is a constant.  

	Only for a small-signal model is h_{FE} constant.
And, when dealing with power generated in the transistor, the
leakage current of the collector/base junction is an
important correction to the external base current.

	The current gain, h_{FE}, is a fairly strong function 
of temperature; my 2N2222 data sheet shows this current gain
at 100 C is roughly 1.6 times the value at room temperature
(25 C).  The leakage current doubles every 10C (rule-of-thumb),
and the external I_{B} is diminished by the amount of
the leakage current ('cuz that current comes in over a
different wire...).

	So, two of the important temperature effects are
simply omitted from this model: they are usually included
only when a power transistor is used, or when some unstable
sorts of biasing (like simple common-emitter bias) are employed.

	John Whitmore
From: jskean@unlinfo.unl.edu (jonathan skean)
Newsgroups: sci.electronics
Subject: Re: Handling CMOS
Date: 27 Dec 1992 09:10:55 GMT
Organization: University of Nebraska--Lincoln	
Distribution: all
NNTP-Posting-Host: unlinfo.unl.edu

kcarver@dante.nmsu.edu (Kenneth Carver) writes:

>4000 series CMOS is well-protected and requires few if any special
>handling precautions.  If you are not drawing an arc when you touch
>these chips, you should be okay.  

You might add: so long as you are handling modern 4xxxB ic's.  If you
get hold of some old pieces with no suffix you will find that they
are the source of CMOS's delicate reputation.  BTW, I worked briefly
at a company best left unnamed where some of the techs routinely swapped
CMOS chips in live circuits.  They seemed to get by with this, at least
in the short term.  I've always thought that a junction could be damaged
without failing immediately so this seemed foolish to me.
--
Jonathan Skean                     usenet: JSKEAN@UNL.EDU
502 Hamilton Hall                  bitnet: JSKEAN%UNL.EDU@UNLVAX1
University of Nebraska              voice: (402)472-2684
Lincoln, NE 68588-0304   USA          fax: (402)472-9402
From: limrcd@hpsgm2.sgp.hp.com (Richard LIM)
Date: Mon, 21 Dec 1992 09:15:10 GMT
Subject: Re: Ni-Cd storage state question.
Organization: HP Singapore Notes-Server
Newsgroups: sci.electronics

The reason I ask is because when you buy Ni-Cd batteries off 
the shelf, they are in fully discharged state. Whereas if I do 
not use a fully-charge Ni-Cd cell for more than 3 to 6 months,
they leak and die!

Could somebody in the Ni-Cd business care to elaborate?


.ps How does that apply to the newer Cam-corder batteries?
Q: Are cam-corder batteries Ni-Cd?

Regards
Richard Lim     "A conclusion is where you get tired of thinking"
======================================================================
E-mail:  hpsgm2.SGP.HP.COM!limrcd   Snail-mail: Hewlett-Packard S'pore
Tel:     (065)-279-2525                         (APD-ThinFilm SS/EE)
Telnet:        520-2525                         1150 Depot Road
HPDesk:  Richard Lim/HP3200/30                  Singapore 0410.
From: pete@q106fm.uucp (pete cervasio)
Newsgroups: sci.electronics
Subject: Re: voice-suppression circuits,karaoke
Date: Wed, 23 Dec 92 16:50:20 CST
Organization: WKBQ-FM Engineering Department

cab@col.hp.com (Chris Best) writes:

> 
> I can't help you find the company, but here's how they work
> (as it was explained to me): any signal common to both
> channels is removed, and signals that are different are
> left in.  So I guess the song has to be stereo.
> 
> Since vocals are typically centered in the image, that's
> what gets cut out.  Don't know what else does, though.

A _LOT_ of the bass disappears, since it's usually recorded center
channel, too.  You need drastic equalization to get some of it back.
There is a problem if there is stereo reverb on the vocals, too... it
doesn't disappear!

Pete C.

+----------------------------------------------------------------------+
| Pete Cervasio                | pete%q106fm.uucp@wupost.wustl.edu     |
| I fish, therefore I am.      | pete.cervasio@f1.n2250.z1.fidonet.org |
+----------------------------------------------------------------------+
|  If you think of C as a preprocessor for your assembler, it makes    |
|                   just as little sense as before.   (me)             |
+----------------------------------------------------------------------+
From: jg@doc.ic.ac.uk (Joao Jose Costa Gondim)
Newsgroups: sci.electronics
Subject: LCD for a Sony radio, where?
Date: 26 Dec 1992 03:04:00 -0000
Organization: Univ. de Brasilia - Brazil
Distribution: world
Reply-To: llazarte@brunb.bitnet
NNTP-Posting-Host: swan.doc.ic.ac.uk

My beloved Sony radio felt, broking its Liquid Cristal Display.
Could any kind soul tell me if it is possible to buy this
display, and where? Any idea of its price? Is it easy to replace?

Thanks in advance for any help,

Leonardo Lazarte     -     LLazarte@brunb.bitnet
(posting from a friend's account)
From: yuen@casbah.acns.nwu.edu (Geoffrey L Yuen)
Newsgroups: sci.electronics
Subject: voice-suppression circuits,karaoke
Date: 23 Dec 92 00:01:04 GMT
Reply-To: yuen@casbah.acns.nwu.edu
Organization: Northwestern University, Evanston, Illinois

Hi there,

I am interested in finding plans,  kits or assembled pc to do lead vocal
suppression on various source materials (tape, radio, CD etc). Can
anyone help provide some hints or clues ?
Am also interested in finding out how they work and quality 
compared to a  karaoke machine (e.g. Pioneer) if somebody out there
had built one before.
I saw the ed in Radio electronics in May but this company already 
disconnected their business phones. 

Many thanks in advance.

- Geoff
Xref: sparky sci.electronics:21374 sci.energy:6351 rec.autos.tech:17061
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: 22 Dec 92 14:31:38 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <72181@cup.portal.com> Ted_Eugene_Viens@cup.portal.com writes:

|Don't want to dissillusion you, Mark.  But I think we are going to find that
|the 1995 compacts weigh a lot less than the 1975 compacts.  Sure, the purchase
|price has gone up.  But has the product lifetime cost in constant dollars gone
|up.  Truth is, I don't know, but my bet is on the not meaningfully side...
|I can promise you this...  Nothing will be brought to market that violates
|prevailing economic tenets.  I still _believe_ that effecient Electric Vehicles
|and Flywheel Vehicles will come to market within ten years.  The product 
|lifetime cost will be less than contemporary internal combustion vehicles.
|And the US economy will be most threatened by the rapid down-sizing of the
|aftermarket auto industry...

Any light weight materials that are cheap enough to go into an electric car
can also go into an IC car.  Therefore, this is not an advantage for the
electric.
We already have _efficient_ electric cars, the problem is cost effectiveness.
In order for this to happen you are going to have to have major improvements
in battery technology, and gas prices will have to go up by a factor of 3
to 4, without electricity prices going up at all.
Flywheel vehicles will only happen if congress manages to repeal most of
the laws of physics.  If you still believe otherwise, you have not been
reading this thread very carefully.
-- 
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
Xref: sparky sci.electronics:21654 sci.energy:6470 rec.autos:30606