HDTenEightyP/NetNews huggingface dataset:
From: ghg@en.ecn.purdue.edu (George Goble)
Subject: Re: Rechargeable lithium batteries?
Organization: Purdue University Engineering Computer Network
Date: Fri, 11 Dec 92 18:49:06 GMT

In article <1992Dec10.171157.28145@epas.toronto.edu> akrajn@epas.utoronto.ca (Anita Krajnc) writes:
>> I have been hearing a lot about rechargeable lithium batteries these days.
>> Supposedly, they are about to replace alkaline batteries for consumer
>> applications.  I read an article about Gates Millenium cells possibly
>> replacing alkalines (and this was quite a while ago), but there must be some
>> sort of problem, since the alkalines are quite popular.
>> Who makes these lithium cells?  Are they possible candidates for use in
>> electric vehicles?  Thanks in advance.          Eric
>
>Although litium batteries are widely used, rechargeable lithium
>batteries have not.  This is unfortunately since lithium rechargeable
>can store approximately 10X the capacity than Ni-Cads, the same size
>and voltage.  The reason why everybody is not using them is due to the
>fact that lithium batteries easily explode when they are inproperly
>recharged.  It would be considered quite dangerous to attempt to
>recharge a large Li battery, especially one used to power a vehicle.
>I believe that in the US, rechargeable Li batteries can not excede an
>AA size.
>	I found that in litigation obsessed North America,

There used to be a company called "Moli" or "Molicell" near Vancouver, BC
(Canada), which made a 12V (4 cell AA) rechargable Lithium pack.
They used to Advertize in QST and other Ham magazines.  It was only
for "experimental" use.  You had to have a waiver (which they sent you)
to transport 4AA cells on a US domestic flight.  It also required a "plug"
be removed to break a 4 cell pack into two 2 cell packs for shipment
to keep the DOT happy.

As I recall, the total capacity was 3X or so a Nicad.  However, one could
only use the center 1/3 or so of the charge/discharge curve.  Exceeding
it at either end, caused the cell to fail and/or not to be rechargable.
This meant the capacity was about 1X a Nicad in this mode.  They had
almost "infinite" shelf lives, and state of charge was easily determined
bu cell voltage (under no load). The voltage varied quite a bit during
discharge, was something like 12v down to 9V or so..

A 4 cell pack cost $100, which had a charger kit in it.. charger
had to cut off at a certain voltage..  Pack had "fuses", so a short
would not make it blow up.  Also, if tossed in a fire, they would
"burn profusely", not blow up, the manual said (due to vents).
--ghg
From: v923064@vms.ucc.okstate.edu
Newsgroups: sci.electronics
Subject: video DAC source?
Date: 16 Dec 92 01:28:43 GMT
Article-I.D.: vms.1992Dec15.192843.1
Organization: Oklahoma State University Computer Center



The manual for my new GA-200 superVGA card says
  "By changin the DAC chip on your display card
  from 8-bit DAC to 15-bit DAC chip,
  your display card may provide up to 
  32,768 addressable colors."
 
Anyone know where I can _get_ these types of video DAC chips 
(and how much they cost would be nice to know)?


thanks.
 
-David Cary
munn@a.cs.okstate.edu
V923064@vms.ucc.okstate.edu
caryd@sune.ceat.okstate.edu
Newsgroups: sci.electronics
From: mark stephens <stephens@kong.gsfc.nasa.gov>
Subject: Re: How to measure humidity
X-Xxmessage-Id: <A7520AD23E01EC3D@mstephens.gsfc.nasa.gov>
X-Xxdate: Mon, 14 Dec 92 09:56:34 GMT
Organization: NASA/GSFC
X-Useragent: Nuntius v1.1.1d12
Date: Mon, 14 Dec 92 14:55:07 GMT

One responce I rcved was interesting due to it's simplicity:


        Well Mark I see you are still building your terrarium and asking
questions like you predicted.  I have not got around to the Possion Arrow
Frogs
yet since I am building new tanks for geckos and pink tongue skinks.  

Anyway to your question which was posted to sci.electronics.  A very
simple
way to keep the humidty high, although not truely measuring the humidty
is to place a small sensor comprising of two electrodes in the tank.  The 
application I saw this in was a orchid house.  Anyway when the
temperature in
the house causes evaporation of the water off the surface of the sensor
the 
misters come on, wet the surface, stop and then wait for the surface to
dry 
again.  This providing a simple solution.  All it requires is a simple
switching
circuit.

This is the solution I am opting for.

                Cheers
                        John Haigh
From: pzelicof@eniac.seas.upenn.edu (PAUL ZELICOF)
Newsgroups: sci.electronics
Subject: ACAD SYMBOLS?
Date: 18 Dec 92 17:27:19 GMT
Organization: University of Pennsylvania

Does anyone have or know where I can get electronics symbols for
use with AUTOCAD? It's been suggested that they exist as public domain.

Responses are appreciated. Email to pzelicof@eniac.seas.upenn.edu

Thanks.
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: Nuvistor audio amplifier schematic
Date: 14 Dec 1992 15:25:39 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <Bz7ovv.FA9@wang.com> dbushong@wang.com (Dave Bushong) writes:
>mjohnson@netcom.com (Mark Johnson) writes:
>
>>I've heard that someone designed line-level audio
>>amplifiers using Nuvistors (!) and that the results
>>were impressive (!!).  I'd appreciate any information
>>about these, ideally a schematic.  Thanks!
>
>It sounds like it was a project that had a requirement that
>all parts must be from a junkbox. VHF/UHF parts are probably the
>last active element that I'd select for in an audio amp.  Unless
>I had no choice (like I was the professor on Gilligan's Island,
>for example).

Umm... actually, I built a phono preamp (and a number of mike preamps)
using nuvistors, mostly because I needed to fit them into very small
areas.  The sound quality of the 6CW4 is magnificent, and I recommend it
as an audio device.  You have to be very careful about microphonics,
though: vibrations perpendicular to the plates are easily picked up 
although vibrations parallel to the plates aren't a problem.  This definitely
affects the design of your mounting structure.

Anyway, using the 6CW4 isn't that much different than using any other
tube in a line level stage, as far as circuit topology goes.  Remember
that your B+ is going to be much lower than you are used to, though.
--scott

  (Okay, I am currently building a power amp with the 829, but don't
   tell anyone.  This is a junk box venture, to say the least.)
Newsgroups: sci.electronics
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Subject: Re: 486DX2 Crystals
Organization: Northeastern Ohio Universities College of Medicine
Date: Sun, 13 Dec 1992 02:38:19 GMT

486DX2 chips use what is essentially a phase locked loop circuit
and 2* oscillator internal to the 486DX2 to synchronize internal
operations to the external environment running at regular speed.
As you might suspect, a clock doubled 25 -> 50 MHz 486DX2 performs
many benchmarks faster than a 33 MHz 486DX.  The clock doubling
inside the chip is offset by the fact that the system clock is only
25 MHz.

Several of the popular trade press publications have performed
comparisons.  There are some non-compute-bound scenarios where a
standard 486DX-33 outperforms a 486DX2-50 (file servers, for
instance).

The moral of the story is to know what you are you are buying and
to what the "MHz" rating refers.  The system clock or the CPU
doubled clock?

There are many other factors such as local bus video, memory
interleaving, secondary cache, EISA vs ISA vs MCA bus, disk system,
etc. that effect performance.  It is difficult to make a
performance evaluation of a system without performing a task mix
that models the actual working environment you intend for the
computer.


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
From: mzk20@spa.amdahl.com (Makoto Kobayashi)
Newsgroups: sci.electronics
Subject: Looking for Western Electric Power Amps
Keywords: power amp
Date: 16 Dec 92 17:47:16 GMT
Organization: Amdahl Corporation  Sunnyvale, CA

I am looking for the parts, particularly the input and the output
transformers, used in the Western Electric Models 42, 43, and 87
power amplifiers.  These models were supposedly developed in the
1930's.  I am planning to build a pair of power amplifiers to
drive a pair of Quad ESL 63 Pros.  My question is where I can get
them.  Any ideas?  I will also appreciate any suggestions on the
substitute transformers.
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: Waveguide question
Date: Mon, 14 Dec 92 18:32:20 CST
Organization: The Inquiring Mind BBS  1 204 488-1607

barr@tramp.Colorado.EDU (BARR DOUG) writes:

> Take a 50ohm coax waveguide of some 100 meters in length. Transmit a sine 
> wave from each end with a 50 ohm impedance amplifier toward the other end. 
> What happens when the two signals collide?  Am I correct in saying the 
> voltages add? 

You can model transmission guides as a linear device and add signals at 
any location. The addition is also a matter of the phase coherency. They 
could subtract if your length is 1/4 wave multiple. To add make it 1/2 
wave. In either case if your sources have perfect impedance the steady 
state is the addition of 2 signals. ANy nonlinearities are easily 
detected as intermodulation (Sum& different frequencies) If they are 
coherent, THen you get a DC voltage (STANDING WAVE) for any non-linear 
effects.

The same holds true for an unterminated or shorted signal path end. 
Microwave or low frequency. When the reflection "collides" with the 
incident wave, you get voltage doubling, depending on whether it is 
multiples of 1/2wave (Open) eg 0 length open circuit is double V...
or 1/4,3/4 etc for shorted ends of the line.

e-...>>>>>>>>>>>>>>>***<<<<<<<<<<<<<<<<<<...e-

Regards,
Tony Stewart/ Unisys Canada  (204)257-9233 All opinions are my own!

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
From: dnwangus@flash.LakeheadU.Ca (Dave Angus)
Newsgroups: sci.electronics
Subject: Re: Flywheel batteries as EV power source
Date: 15 Dec 1992 22:45:32 GMT
Organization: Lakehead University, Thunder Bay, Ont., Canada

In article <1992Dec13.114534.961@cmkrnl.com> jeh@cmkrnl.com writes:
>In article <Bz6nuM.LCo@acsu.buffalo.edu>, v064mb9k@ubvmsd.cc.buffalo.edu 
>(NEIL GANDLER) writes:
>>  I just have finished reading the latest Popular Science issue. Jan 93.
>> On p. 27 they discuss flywheel power as a possible energy source for 
>> future Ev's. Claimed advantges are a cruising rnage of over 600 miles
>
>It isn't exactly "new" -- PS had a cover story on flywheel-based EVs something
>like 20 or 30 years ago.  At that time there was a small fleet of
>flywheel-driven streetcars in, I believe, Denmark. These did not use a
>high-tech flywheel and could run for only ten minutes or so away from the power
>source -- but that was sufficient to allow them to leave the overhead power
>lines for a block or two. 

Just coincidentally I was reading through the November 1958 issue
of Popular Science.  On page 139 is a photo of a little electric
locomotive with this caption:

Flywheel-driven engine.

This gyro-electric locomotive needs no
overhead trolley.  It is driven by a fly-
wheel that turns a generator to supply
current, as in the drawing at left.
  At stops five miles apart, overhead
pickup arms connect with conductors to
renew the charge.  The generator then acts
as a motor to reaccelerate the flywheel.
The locomotive is built by Oerlikon of
Zurich for Swiss mines and steelworks.

The diagram shows the flywheel mounted with its shaft vertical, on
a spring suspension. 


--
Dave Angus                                   "Kundalini wants his hand back"
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Elektor Electronics USA - R.I.P.  (was Re: Anybody get their )
Organization: SSC, Inc.,  Seattle, WA
Distribution: na
Date: Tue, 15 Dec 1992 23:31:26 GMT
X-Newsreader: TIN [version 1.1 PL6]

Mark Zenier (markz@ssc.com) wrote:
: Anyone get the November 1992 Issue of the USA edition?.  I havn't seen
: my subscription copy and a local store which gets it in bulk for their 
: magazine rack hasn't gotten a copy in over a month.

Well, the good news is I got my copy.  The bad news is that
the cover has "FINAL ISSUE, See page 11" on the cover.

The Statement of ... Circulation shows that they only had
some 13000 subscribers.  We all now get the choice of several 
other magazines.  Including the UK edition of Elektor.

Mark Zenier  markz@ssc.wa.com  

Xref: sparky sci.electronics:20928 sci.energy:6177 rec.autos.tech:16791
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
Date: 17 Dec 1992 06:28:04 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 <1gp2pdINN680@usenet.INS.CWRU.Edu>, bj368@cleveland.Freenet.Edu
(Mike E. Romano) writes:

=This flywheel discussion is interesting.
=I am not an engineer but note it was mentioned that a proper
=size flywheel can store the energy/power of a v8 engine.
=
=What is the simple equation here for energy (horsepower) stored
=in say a flywheel weighing 200 pounds, spinning at  1000 rpm?
=My last physics course was in high school.

First:  Horsepower is a unit of power (energy delivered per unit time), not of
energy.  Second, the amount of energy stored in a flywheel is dependent on the
geometry of the flywheel as well as its mass and its speed.  The energy stored
goes as the product of the moment of inertia and the square of the frequency at
which it's spinning.
--------------------------------------------------------------------------------
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: nyarko@ee.ualberta.ca (David Nyarko)
Subject: Re: Yamaha Chip STK3042 III
Keywords: Yamaha, Amp
Organization: University Of Alberta, Edmonton Canada
Date: Mon, 14 Dec 1992 20:11:12 GMT

robertso@unpsun1.cc.unp.ac.za (Mike Robertson) writes:

>Hi,

>I'm trying to obtain the amplifier driver chip for a Yamaha Amp.  The number is STK3042 mark III.  Any ideas? (Preferably a mail order company!).


>Thanks

>Mike Robertson                 |  DISCLAIMER: These are *my* thoughts & are
>robertso@unpsun1.cc.unp.ac.za  |  thus not necessarily those of the Computer
>                               |  Services Div. at the University of Natal

MCM have it listed in their most recent catalog I have (Catalog 30).
STK3042III $7.92 each for 1-4. However for International Shipping,
they ask that at least $23.25 be includded to cover international
shipping and handling. In addition their minimum order is $20.00
	MCM ELECTRONICS
	650 Congress Park Drive
	Dayton, Ohio 45459-9955
	U.S.A
Fax no 1-513-434-6959
			David
Newsgroups: sci.electronics,rec.audio,rec.music.makers.guitar,alt.guitar
From: dcovell@hfglobe.intel.com (David Covell)
Subject: Amp question
Organization: Intel Corporation
Date: Wed, 16 Dec 1992 19:57:03 GMT


Older Fender amps use a black material as a substrate for the point-to-
point wired circuitry. What is this stuff, what's its proper name, and
where can I get some (or an acceptable substitute)?  
The material is black, semi-flexible, about 3/32" thick, and I assume it
has high dielectric value. Probably very tolerant of high temperatures also.
I don't care if it's not identical to the original Fender material as long
as it works in similar applications.
Thanks in advance...
Newsgroups: sci.electronics
From: ankleand@mtl.mit.edu (Andrew Karanicolas)
Subject: Re: The "1 bit" DAC's BIG
Organization: MIT Microsystems Technology Laboratories
Date: Sat, 19 Dec 1992 06:35:10 GMT

In article <gate.s0wJVB1w165w@toz.buffalo.ny.us> cyberman@toz.buffalo.ny.us (Cyberman) writes:
>    What about the sample rate?  8k per second could cauas
>    alaising problems.  The Vref I was planing on using a zener
>    diode with a trimmer resistor and a voltage follower opamp as
>    a buffer.  Once adjusted that should be very stable, or
>    am I missing something?

This won't do for a reference.  You should use one of the many bandgap
voltage references available.  Analog Devices and National have many
to choose from.  Take a look at Crystal's catalog for a good
discussion on voltage references.

-- 
Andrew Karanicolas
MIT Microsystems Technology Laboratory
ankleand@mtl.mit.edu
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: rodder@ccwf.cc.utexas.edu (Jon D. Rodder)
Subject: Re: Flywheel batteries as EV power source
Organization: The University of Texas at Austin, Austin TX
Date: Fri, 18 Dec 1992 01:26:54 GMT

In article <1992Dec17.011649.987@cmkrnl.com> jeh@cmkrnl.com writes:
>
>Then we come to electric motors to drive the wheels.  Electric motors have
>wonderful torque/speed characteristics for vehicles (they generate maximum
>torque just before stall speed, which may make transmissions and clutches
>unnecessary) but lousy power density -- look at the size of a 1-hp. electric
>motor sometime and tell me how big a motor would have to be to accelerate a
>car fast enough to keep up with gasoline-powered ones.  
>
>Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com

Well, lets see..  the 20hp permanent magnet motor in our solar powered car
is about 6 inches in diameter and 6 inches long.  It weighs under 20lbs.
See the GM Impact for a production style example of a compact high power
motor.
-- 
-=<   Jon Lusky ----- rodder@ccwf.cc.utexas.edu   >=-- 
   \    IRC-Op at tramp.cc.utexas.edu (Rodder)   /
    \    89 Jeep Wrangler - 258/for sale!       / 
     \        79 Rx-7 - 12A/Holley 4bbl        / 
      \________67 Camaro RS - 350/4spd________/ 
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: basiji@stein.u.washington.edu (David Basiji)
Subject: Re: Flywheel batteries as EV power source
Organization: University of Washington
Date: Thu, 17 Dec 1992 20:56:31 GMT

carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:

>I'm afraid you've forgotten the law of conservation of energy again.  I ask
>again:  IF THE ENERGY THAT'S BEING DUMPED DOESN'T END UP AS HEAT, WHERE'S IT
>GOING?  HOW'S IT BEING TRANSFERRED OUT OF THE SYSTEM?

>=With proper engineering of the flywheel
>=to shatter into uniformly-sized pieces (for maximum energy xfer in collision)
>=and an appropriate weave or composite of Kevlar in the housing, it seems
>=that it's within shooting range (pardon the pun) to develop a system where
>=there's enough energy loss via particle collision and fracture that the
>=heat generated in the housing materials will be manageable. 

>Again you prattle of "energy loss."  WHERE IS THIS ENERGY BEING "LOST" TO?
>It doesn't just go away because you find it inconvenient.  And the remnants of
>the flywheel don't just keep orbiting the place where the shaft used to be.  So
>where did all the kinetic energy go?

The energy is being used to split the covalent bonds that hold the flywheel
together. In essence, you're separating charged atomic species and therefore
converting the kinetic energy of the rotor into potential energy in the
form of fragmented material.  The idea of the housing is to allow the
rotor components enough time to interact with each other so that a large
fraction of the energy goes into rotor destruction rather than housing
destruction.

David Basiji
UW Bioengineering
NeRD #3762

Newsgroups: sci.electronics
From: strong@tc.fluke.COM (Norm Strong)
Subject: Re: Origin of 'BNC'
Keywords: BNC CONNECTORS HISTORY QUESTION
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Date: Thu, 17 Dec 1992 20:10:22 GMT

In article <BzBMr3.E7K@world.std.com> dlowe@world.std.com (Miller Lowe) writes:
}We have a raging debate going on at work with some folks beliving
}that BNC stands for British Naval Connector.... While others(Like
}me) say Bayonet-Neill-Concelman.
}
}The AMP catalog says that BNC is 'Said to be' Bayonet-Neill-Councelman. We
}would be very interested in any source of reliable information that
}documents the origin of the BNC naming convention.

Well, we KNOW that the C connector was invented by Concelman, and we
KNOW that the N connector was invented by Neill.  We might extrapolate
that BNC is Bayonet-Neill-Concelman, and TNC is Threaded Neill-Concelman. 

But, we could be absolutely WRONG.  

-- 

Norm Strong  (strong@tc.fluke.com)
2528 31st S.   Seattle WA 98144   USA
From: sasrer@unx.sas.com (Rodney Radford)
Newsgroups: sci.electronics
Subject: Re: Caller ID block?
Date: 16 Dec 92 18:50:48 GMT
Organization: SAS Institute Inc.

curt@oasys.dt.navy.mil (Curt Welch) writes:
>In sci.electronics, mdk@col.hp.com (Mark Keisling) writes:
>> What will you people do if someone calls from a payphone?

>In interesting fact for Caller ID users that few people seem
>to know:
>    Pay phones usually have a 9 as the middle digit of their
>    number.  e.g. 238-9123.

Maybe that is why my phone bill has always been so high, as my home phone
number also has a '9' in the 4th digit!  ;-} ;-} ;-}

I also know of at least two other non-pay_phones that have a '9' as the 4th 
digit, so I would certainly not rely on using that as a positive indication 
that the caller is at a pay phone!

Just thought I would point this out before someone designs their automatic
caller-id phone system to flag all "4th digit '9's" as pay-phones. Thanx.

--
---
Rodney Radford          || Computer Graphics/Imaging
sasrer@unx.sas.com      || SAS Institute, Inc.
(919) 677-8000 x7703    || Cary, NC  27513
From: baden@inqmind.bison.mb.ca (Baden de Bari)
Newsgroups: sci.electronics
Subject: [* Vision System *]
Date: Wed, 16 Dec 92 00:41:56 CST
Organization: The Inquiring Mind BBS  1 204 488-1607

 
        Hi there... I was wondering what king of 'visual screens' would 
be suitable for a vr vision system (and somewhat inexpensive!).  I was 
thinking of using the lcd display screens found in portable/pocket-sized 
television sets.
        If anyone has any suggestions, please reply publicly...
 
                Thanks!
        >>Baden<<


baden@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: ren@rap.ucar.edu (Ren Tescher)
Subject: Re: Is there a FAQ file for sci.electronics?
Organization: NCAR, Research Applications Program
Distribution: usa
Date: Sat, 12 Dec 1992 16:38:16 GMT

In article <mcfearin.724104696@dhostwo> mcfearin@convex.com (Lee Mcfearin) writes:
>jbs4930@usl.edu (Scott Jeffrey B) writes:
>
>>If there is, could someone please e-mail it to me or
>>tell me where I might be able to ftp it?
	The original question was, 'Is there a FAQ (Frequently Asked 
Question) for this newsgroup?'
	The answer is,
YES! and you just asked it!
B^)
ren n0pvi
dona nobis pacem
Newsgroups: sci.electronics
From: kewta@solomon.technet.sg (Kew Tow Ann)
Subject: Where to get 8097/7 microcontrollers
Organization: TECHNET, Singapore
X-Newsreader: TIN [version 1.1 PL8]
Date: Sat, 12 Dec 1992 09:58:55 GMT

Would appreciate if anyone knows of a mail order source for Intel 8096/7
micrcontroller? 
Newsgroups: sci.electronics