HDTenEightyP/NetNews huggingface dataset:
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Basic bench equipment query
Date: Mon, 28 Dec 1992 01:31:02 GMT
Organization: U of Toronto Zoology

I wrote:
>Note, though, that any frequency measurement using something other than
>a scope relies heavily on assumptions about waveform...

A friend points out that "a scope" should read "a scope or a spectrum
analyzer".  However, this isn't likely to matter in this context...
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
Xref: sparky sci.electronics:21355 sci.energy:6341 rec.autos.tech:17050
From: Ted_Eugene_Viens@cup.portal.com
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: Tue, 22 Dec 92 01:28:13 PST
Organization: The Portal System (TM)
  <1992Dec16.192456.6261@news.cs.brandeis.edu>  
  <1992Dec17.011649.987@cmkrnl.com> <1992Dec18.012654.26238@ra.oc.com>  
  <77851@ncratl.AtlantaGA.NCR.COM> <72023@cup.portal.com>
  <77953@ncratl.AtlantaGA.NCR.COM>

>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-wei
g
>h
>|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 itsel
f
>a government.
>It ain't charity if you are using someone else's money.
>Mark.Wilson@AtlantaGA.NCR.com
>
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...
Bye...  Ted..
From: curt@oasys.dt.navy.mil (Curt Welch)
Newsgroups: sci.electronics
Subject: Re: Caller ID block?
Date: 22 Dec 92 06:01:35 GMT
Reply-To: curt@oasys.dt.navy.mil (Curt Welch)
Organization: Carderock Division, NSWC, Bethesda, MD

In sci.electronics, vporguen@unlinfo.unl.edu (victor porguen) writes:
>Sure, money has nothing to do with it. It's a social service, right?

I may differ from you in my ideas about the "worth" of Caller ID,
but I do have to agree with you on this issue.  The phone companies
are making a nice little income from selling unlisted numbers, and
then selling Caller ID, and then selling call trace, and then selling
Caller ID block, and then selling Caller ID block block, and then
selling second phone lines ...

If the phone companies could't make money off of it, we wouldn't
have Caller ID.  Why, just think about how much money they've made
leasing communications lines to transport these news articles!

Curt
Newsgroups: sci.electronics
From: wb9omc@dynamo.ecn.purdue.edu (Duane P Mantick)
Subject: capacitors
Summary: need replacement
Keywords: bipolar
Organization: Purdue University Engineering Computer Network
Date: 29 Dec 92 20:27:28 GMT


I wonder if someone has any idea where I can find a replacement for a
16 uF 63 volt bi-polar capacitor?

I will not object to varying the capacitance anywhere from 15 to 22 or even
25 microfarads but anything much under 63 volts is a problem.  The capacitor
is for a horizontal deflection circuit.

So far everything I have found goes only up to 50 volts.

If any of you have a source for bi-polar caps that might be able to
help, please email -

Duane Mantick
wb9omc@harbor.ecn.purdue.edu

Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Substituting fsuppli
Date: Tue, 29 Dec 1992 20:46:53 GMT
Organization: U of Toronto Zoology

In article <BzzBDz.G00@acsu.buffalo.edu> v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:
>Are DC adapters pretty regulated on their own. If I dont exceed the 
>amperage can I be sure that the output voltage will notmuch below
>12 volts ...

In my experience, no.  The output voltage varies quite substantially with
the current drain.  My guess is that they don't have any regulation in
them, just transformer plus diodes plus (I hope) a filter capacitor.
This is plenty good enough for their original application -- battery
elimination -- since equipment powered by (non-rechargeable) batteries
has to tolerate wide voltage change as batteries age.

I'd expect that some adapters are better than others, so the definitive
answer is to test your adapter under load:  buy a handful of power
resistors and try it out.  But don't get your hopes too high.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: clarke@acme.ucf.edu (Thomas Clarke)
Subject: Re: DOES AMERICA SAY YES TO JAPAN? - Off track!!
Organization: University of Central Florida
Date: Mon, 21 Dec 1992 15:01:41 GMT

In article <BzGp92.9Gr@tss.com> burke@tss.com (Jim Burke) writes:
> In article <1992Dec17.123430.24528@hellgate.utah.edu>,  
llarsen%peruvian.cs.utah.edu@cs.utah.edu (Loren Larsen) writes:
> 
> |> BZZT! WRONG!  Consider that almost 80% of all Honda cars are made from
> |> the ground up in the US.  
> 
> There is another big reason that foreign companies, including Japanese ones,
> locate assembly plants in the U.S.  That is so that they can avoid paying
> a lot of income taxes on the huge profits they make from the U.S. market.

I saw a New Yorker Cartoon:
An auto dealership, the salesman talking to a couple looking at
a car.  He is saying:
"And it's made in America with Japanese know-how!"

Sad, but true.
--
Thomas Clarke
Institute for Simulation and Training, University of Central FL
12424 Research Parkway, Suite 300, Orlando, FL 32826
(407)658-5030, FAX: (407)658-5059, clarke@acme.ucf.edu
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 14:20:15 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <78885@ncratl.AtlantaGA.NCR.COM> mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson) writes:

>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.

Sorry about responding to my own post, but I forgot something.

The vaporized carbon-carbon will deposit itself on the first thing that
it encounters that is cold enough to cause it to condense.
In this case, the inside of the containment vessel.  By condensing the fluff
will transfer the heat of vaporization to the containment vessel.
By vaporizing the flywheel, you have not diverted the energy, but mostly
just delayed it a bit.

The only way to get rid of this energy is to vaporize material.
If the containment was made out of carbon-carbon as you suggest, then it
must be massive enough that after the requisite amount of material has
vaporized, there is still a thick enough wall to withstand the pressure
of all of that hot gas inside the containment vessel until the unit
as a whole has had enough time to radiate the energy away as heat.

As I see these are the data points we need for carbon-carbon.

Heat of vaporization.  (how much material is needed to absorb the energy)
Vaporization temperature of carbon-carbon.
       (This will be the temperature of the gas inside the containment
       vessel.  If it were any hotter it would vaporize more of the
       containment and cool itself off.  Since we know the amount of
       c-c that has vaporized, and the gases temperature, we ought
       to be able to calculate the pressure inside the containment.)
Tensile strength of c-c.  (This will tell us how thick the remaining
	containment vessel will have to be to contain the pressure
	we calculated above.  Does anyone know if heat affects the
	strength of c-c, since the inside surface of the vessel will
	be just below the vaporization point.
It might be nice if we knew the thermal resistance of c-c.  (That way
	we could calculate just how hot the outside surface of the
	containment will get, and how long it will take to cool
	down.)
-- 
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: jblake@hprpcd.rose.hp.com (John Blake)
Date: Wed, 23 Dec 1992 19:17:43 GMT
Subject: SPECIAL SALE - TEKTRONIX 221 MINISCOPE
Organization: HP Roseville Site
Newsgroups: sci.electronics

(Note:  I am entering this for a friend.  You can either call him directly,
  or I can relay an offer for you.)

TEKTRONIX MODEL 221 MINISCOPE FOR SALE

* Bandwidth -- DC to 5MHz
* Range -- 5 mV/div to 100 V/div
* Floatable to 600 volts
* Internal battery pack
* Integral probe
* Trigger -- internal and external
* Weighs only 3.5 pounds
* Size -- 5.2 in. X 3.0 in. X 9.5 in.
* X-Y operation
* Shock -- can withstand 100 g's
* Comes with owner's manual and carrying case
* Originally cost $2,950

* YOUR COST:  $475

Call Don at (916) 633-2204

Newsgroups: sci.electronics
From: mgm@world.std.com (michael g moncur)
Subject: Re: Can LED segments be fixed?
Organization: The World Public Access UNIX, Brookline, MA
Distribution: na
Date: Mon, 4 Jan 1993 04:05:57 GMT

silver@fraser.sfu.ca (Craig Silver) writes:

>I have an old tv converter.  It's a Jerold, the one with the remote 
>that takes a 9 volt.  Some of the red LED segments that make up the 
>channel display don't light up anymore.  I know the converter is 
>probably not worth fixing, but I'm just curious as to whether or 
>not these things can be done at a barable cost.

No, there's no way to fix an individual segment of an LED display short of
microsurgery. 
 
On the other hand, I think those Jerrold TV converters just use two
standard 7-segment displays, and since these can be had for under a
dollar, that's undoubtedly the way to fix it.
-- 
~`~`michael moncur - mgm@world.std.com / sysop@onlybbs.via.mind.org ~`~`

Xref: sparky sci.electronics:21666 sci.energy:6487 rec.autos:30640
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 02:02:30 GMT
Followup-To: sci.energy

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:
> >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
[...]
> explosion.  You don't need perfect 14:1 to cause an explosion.

While on insignificant details, I will point out that any deviation from
the 14:1 ideal mixture may still explode, but will not release the maximum
power.  That is, with too much gas, a lot of the gas will not combust in the
explosion.  With too much air, some gas will not combust, and the speed
of the explosion is less, resulting in less power.


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
Xref: sparky sci.electronics:21840 sci.physics:22018
From: quest@iowegia.uucp (Steve J. Quest)
Newsgroups: sci.electronics,sci.physics
Subject: Re: Lasers/collimated light in RGB?
Date: Fri, 01 Jan 93 00:39:10 CST
Distribution: world
Organization: Iowegia Public Access Usenet/UUCP, Clive IA USA.

jlange@radian.uucp (John Lange) writes:

> In nightclubs I have recently seen light effects which apparently
> use bright red, green, and blue lasers which are modulated with 
> mirrors (I think) to do interesting things like project color 
> images on a wall.  The red could be a simple He-Ne laser, but what 
> about the green and the blue?  I know these light sources can be 
> made with expensive 
> 


John,

        You can get colored laser light many ways.  Primarily 
today, we use an Argon/Krypton mix gas laser for continuous wave 
"nearly white" laser light.  The Argon/Krypton lasers produce 
laser energy in just about every band from UV to IR, with many 
bands in the blue and green spectra.

        The old way was to use an Argon and a HeNe laser together, 
about 100mw of Argon- prism split mixed with about 20 to 30mw of 
HeNe 630nm red.  The Argon produced both blue and green, many 
bands of each- and when mixed with green gave a suitable orange to 
orange yellow laser.  Nice effects..............sq

(the beams are scanned using General Scanning scanners.....)
From: dbell@cup.portal.com (David J Bell)
Newsgroups: sci.electronics
Subject: Re: RFI free dimmer switches...
Date: Fri, 25 Dec 92 21:46:07 PST
Organization: The Portal System (TM)
Distribution: na


>I just noticed that some light dimmers claim to be RFI free. I assume
>they are using a zero voltage switch, to suppress transients.
>(zero voltage = zero crossing detector, to fire the triac when the line
>voltage is off (0 VAC), instead of firing the triac mid cycle (that's why
>normal switches arc))

Yep...

>Now, people on the net are going to wonder why I'm obsessed with dimmers!
>But a light dimmer I have installed makes the lightbulb RING alot, and
>it's very annoying. The ringing gets worse when you dim the light. I'm
>wondering if a "RFI free" dimmer will reduce this ringing. Anyone know?
>(I took mine apart, and it's just a triac and some passive things, and 
>a couple diodes; no hint of anything fancier).

I'm afraid the half-cycle pulses would still tend to induce the
ringing. I've also noticed this with dimmers, and wish I could 
eliminate it! Consider also the effect of reducing the RMS output
to, say 10%, by limiting the power to full half-cycles. I would
expect a *great* deal of flicker...

Dave
dbell@cup.portal.com
Newsgroups: sci.electronics
From: ldstern@rodan.acs.syr.edu (Larry Stern)
Subject: Cost of running my PC?
Organization: Syracuse University, Syracuse, NY
Date: Mon, 21 Dec 92 04:02:51 EST

I'm sure this is a simple one, but somehow it eludes me.  I need to know how
much electricity my pc is using.  It is a 386 AT clone with a 200W power
supply.  I can find out the local rate for KW hours but how do I determine
how much current the pc (and monitor) is drawing?

						Thanks,
						Larry
From: curt@oasys.dt.navy.mil (Curt Welch)
Newsgroups: sci.electronics
Subject: Re: Caller ID block?
Date: 21 Dec 92 16:42:41 GMT
Reply-To: curt@oasys.dt.navy.mil (Curt Welch)
Organization: Carderock Division, NSWC, Bethesda, MD

In sci.electronics, vporguen@unlinfo.unl.edu (victor porguen) writes:
>If you call an airline to get a flight schedule, they now may call
>you back.  At any time. In the middle of the night. For any purpose.
>Sales, solicitation, you name it. Or give your number to anyone they
>please.  For any purpose.

>Caller ID is a weapon, and it's aimed at YOU!

Why are you so scared of such a feeble weapon like the phone?  Did
your parents beat you with a phone when you were a child?  Or is it just
the thought of having a stranger call you that scares you so much?  You
really should work on overcoming your fears.

Guess what.  The airlines can call you anytime they want, whether
they have caller ID or not.  If you use their 800 number, they
get your phone number - and they always have.

Guess what.  I have your name and e-mail address.  It's a weapon too. 
And I've got it aimed right at YOU!

Are you going to start complaining about how e-mail and news messages have
a return address on them next.  And start crying about how unfair it is
that any crazy USENET reader (like me) can start harassing you?

And by posting in sci.electronics, there are now thousands of people that
have your name and e-mail address.  Why are you so worred about one
company getting your phone number but you don't seem to mind giving your
e-mail address to thousands of people all around the world?

If you send e-mail to my account I think it's only fair that I know who
it came from.  And if someone calls me on the phone, I think it's only fair
that I know who called me.

I agree that the phone company is forcing you to do something you don't
want to do (i.e. give out you phone number), and that's not nice.  No one
likes to be forced to do anything they don't want to do.  And many people
don't like Caller ID just for this reason - not because they don't like
it - but because they were never given a choice.

But thinking that Caller ID has no use but to make the phone companies
more money is a bit off base.  Get a grip guy.  You don't have to like
it, but you do have to live with it.

Curt Welch
From: behnke@FNALF.FNAL.GOV
Newsgroups: sci.electronics
Subject: Re: help needed building water level sensor
Date: 29 Dec 92 17:06:29 GMT
Reply-To: behnke@FNALF.FNAL.GOV
Organization: Fermi National Accelerator Lab
NNTP-Posting-Host: fnalf.fnal.gov

In article <00965764.D96DDB80@Msu.oscs.montana.edu>, uchrgrh@Msu.oscs.montana.edu writes:
>I would like to build a solid state device that would turn off a water
>pump in my aquarium if the water level drops  below a certain level.
>I am willing to look at prefabricated stuff but would prefer to build it
>my self.

Seems that a simple micro-switch attached to a float would work fine.  The float
would be attached to the lever of the micro switch.  The pump motor is in series
with the micro switch.  When the float level gets below a level YOU consider
safe, the switch opens and stops the pump.  For a analogous system, take the
cover off of the tank of your toilet and watch how the action works when you
flush it.  If needed, one could get fancy and have an extra tank of fresh H2O.
When the water level in the main tank drops below a specified level, a second
pump is started to pump fresh water into the tank to keep the filter pump
operating.

Just an idea.

Mike "This 24GB database will be the death of me" Behnke

My opinions are my own, and MOST of them don't mean a thing !

mb
From: pwl@tc.fluke.COM (Paul Lutt)
Newsgroups: sci.electronics
Subject: Inexpensive Data Access Arrangement?
Date: 24 Dec 92 17:06:18 GMT
Article-I.D.: tc.1992Dec24.170618.24811
Organization: John Fluke Mfg. Co., Inc., Everett, WA

Does anyone know where one can get an inexpensive data access
arrangement module?  This is the FCC approved piece that is required to
connect foreign equipment to the telephone system.  I know of one
vendor that sells a module for $29, but I would like to find something
a little cheaper.

My actual requirements don't require receive capability.  I just need
off-hook control, ring indicator, and transmit.  Any pointers to
reasonable products would be appreciated.  Thanks.
--
	Paul Lutt
Domain:	pwl@tc.fluke.COM
 Voice:	+1 206 356 5059
  UUCP:	uunet!fluke!pwl
 Snail:	John Fluke Mfg. Co. / P.O. Box 9090 / Everett, WA 98206-9090
From: rplourde@leotech.mv.com (Richard Plourde)
Sender: uucp@leotech.mv.com
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 20:46:35 GMT
Organization: University of Saskatchewan, Saskatoon, Canada
Distribution: world
NNTP-Posting-Host: skorpio.usask.ca

In article <1gqhdqINNjot@gap.caltech.edu>, carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:
|> In article <1992Dec17.170002.28389@u.washington.edu>, basiji@stein.u.washington.edu (David Basiji) writes:

|>  Perhaps you'd care to review the title of the
|> thread: "Flywheel batteries as EV power source."  That's why I was talking
|> about enough energy to travel for ~100 miles at freeway speeds.  Now, if you
|> simply want to use the flywheel for load averaging, then we're talking about a
|> LOT less energy stored in the flywheel.  In that application, I'd agree with
|> you that the dangers of a catastrophic failure of the flywheel would be quite
|> acceptable.
|> 
|> =It is the flywheel which provides the motive force
|> =for the vehicle via some clutch and gearbox or torque converter.
|> 
|> The idea in this thread was that the flywheel is part of a generator which
|> provides electrical power to the vehicle's electric motor.  That's what the
|> "EV" stands for in the title of the thread, and why it refers to the flywheel
|> as a "battery."

I've seen massive rotating objects being used in electrical power generation.
For instance, a turbine shaft in a hydroelectric generator that looks the size
of a spinning boxcar. If the water was shut off, the thing would grind to a
halt pretty quick because of the counter torque from a loaded generator (Some
generators are run as motors so that the power production is kept up; you don't
want to have to stop and restart this spinning boxcar). This shaft isn't
running all that fast so there isn't as much fear of explosive breakdown, but
I bet there's a lot of kinetic energy.

A flywheel that has the power to run a car at highway speeds (I read in the
paper that 8 hp can maintain the speed on average) can be compared to giving
a car a big slap in the rear and seeing how far it can coast. If you want to
store so much kinetic energy, you'll need a very fast wheel. It shouldn't
slow down too much unless you can pick it up again.

I've had little toy cars with flywheels and toy cars with windup springs.
How about spring energy or gravitational energy?

-- 

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
From: rplourde@leotech.mv.com (Richard Plourde)
Sender: uucp@leotech.mv.com
Newsgroups: sci.electronics
Subject: ViewSonic
Date: Tue, 29 Dec 1992 21:20:00

To:  jon@sparcplug.iupui.edu

Re:  ViewSonic Monitors

ViewSonic
20480 E. Business Parkway
Walnut, CA 91789
714.896.7976 800.888.8583  FAX: 714.869.7958
"Hot Line" (24Hr) 714.869.7318

ViewSonic is very much alive ... is one of the more popular monitors
now
kicking around, so you should have few problems getting a local
service
center from the company.  (Er..., perhaps it will mean shipping the
monitor back to the company, itself.  Call and see.)

Best Wishes

Dick
rplourde@leotech.mv.com



 * Origin: Leo Technology (603)432-2517/432-0922 (HST/V32)
(1:132/189)
Newsgroups: sci.electronics,comp.sys.laptops
From: lenny@hobbs.hunt.inmet.com (Lenny Goodman)
Subject: Re: Duracell advertising NiMH batteries
Organization: Intermetrics, Inc.
Date: Thu, 24 Dec 1992 01:49:22 GMT

In article <PHR.92Dec22230558@napa.telebit.com> phr@telebit.com (Paul Rubin) writes:
>The current BYTE magazine has a big ad from Duracell advertising
>NiMH battery packs, allegedly soon to be available at retail outlets
>everywhere.  They look in the photos like snap-in packs for
>notebook computers.  I don't have the text handy but there
>was no indication that loose cells would be availble.
>I plan to phone them when I get a chance and try to get more info.

I did phone them after I saw the ad in Byte  and they said they were 
not marketing them in normal consumer sizes (AA,C,D,AAA,9V). They
told me the batteries were for applications such as notebook computers
and camcorders.

  -- Len Goodman
Newsgroups: sci.electronics