HDTenEightyP/NetNews huggingface dataset:
From: peny@ppc.lpc.ethz.ch (Peter Nyffeler ,x4399)
Subject: Blue LED manufacturer
Reply-To: peny@ppc.lpc.ethz.ch
Organization: ETH-Zuerich, Physical-Chemistry-Lab. - Switzerland
Date: Fri, 18 Dec 1992 17:44:18 GMT

Wasen't there samoone looking for blue LED's?

I saw an advertisment of STANLEY ELECTRONIC Japan that they produces blue LED.
This firm is well representated in Europe and I think in USA too.

--------------------------------------------------------------------------------
						  __________
Peter Nyffeler					 / ___  ___ \
ETH-Zuerich, Physical-Chemistry-Lab.		/     \/     \ 
Switzerland					|  ___  ___  | Soaring
e-mail:peny@ppc.lpc.ethz.ch			|     \/     | Club
fax: ..41 1 252 34 02				|  ___  ___  | Zuerich 
tel: ..41 1 256 43 99				\     \/     /  
						 \__________/ 
					     + Control-line modell enthusiast
--------------------------------------------------------------------------------
 

Newsgroups: sci.electronics
From: sburns@carson.u.washington.edu (Sherri Burns)
Subject: Re: SPICE models
Organization: University of Washington
Date: Tue, 15 Dec 1992 04:29:59 GMT

Brian_-_Dziki@cup.portal.com writes:

>    I was wondering where one might find SPICE models for transistors. We have
>IsSpice at work, but the library does not include the transistors that we ne
>model. Is there an Internet site where one my find them?

I would have a hard time trusting a Spice model that didn't come directly from the manufacturer.  Why not use a Semiconductor Parameter Analyzer to build your own model?

Lee Burns
InControl, Inc.
Redmond, Wa
 
Newsgroups: sci.electronics
From: mgc@unislc.uucp (Marc Christensen)
Subject: Re: wired IR repeater?
X-Newsreader: TIN [version 1.1 PL6]
Organization: Unisys Corporation SLC
Distribution: na
Date: Mon, 14 Dec 1992 22:05:18 GMT

Chris Elmquist (elmquist@pez.ssesco.com) wrote:
: This may have been discussed here recently... if so, perhaps someone
: can point me to the archive.
: 
: What's involved in building a wired IR repeater ? (to control equipment
: inside a closed cabinet for example).  Is there more to it than just
: a receiver, amp, and transmitter LED ?  I seem to remember some discussion
: where a 555 timer was being used (to re-time perhaps ?)
: 
: Does anyone have a circuit for such a beast ?  I know where to buy them
: (for $50+) but I'm interested in integrating a homebrew circuit...
: 

Radio Shack has a Rcvr/Demodulator made by sharp that will pick up the
remote signal that is pulses modulated at 40Khz and output an inverted
ttl signal that you should be able to invert and send to a 555 timer to
remodulate it at 40Khz and send it to an I/R LED inside the cabinet. 

The module costs about $3.50

Marc Christensen
Newsgroups: sci.electronics
From: apeel@munta.cs.mu.OZ.AU (Andrew Peel)
Subject: C compiler for 80C31 or 68HC05
Summary: Do cheap ones exist?
Keywords: compiler,80C31,68HC05
Organization: Computer Science, University of Melbourne, Australia
Date: Fri, 18 Dec 1992 05:06:19 GMT


Hello

Are there any freeware/shareware C compilers for the 80C31 or 68HC05
microcontrollers available? Have you had any problems with such a beast?

Thankyou 

Andrew Peel
----------------------------------------------------------------------
University of Melbourne
Computer Science Dept.
-- 
---------------------------------------------------------------------------
Andrew Peel.					University of Melbourne,
apeel@cs.mu.OZ.AU				Computer Science Dept.
Newsgroups: sci.electronics
From: morrison@cs.uiuc.edu (Vance Morrison)
Subject: Re: Flywheel batteries as EV power source
Organization: University of Illinois, Dept. of Comp. Sci., Urbana, IL
Date: Thu, 17 Dec 1992 20:12:23 GMT

jeh@cmkrnl.com writes:

>I think what you mean here is "mount the flywheel in a gimbal mounting".  Fine,
>but now you have to come up with a really creative way of coupling large
>amounts of mechanical or electrical energy to the part of the car that's
>outside the gimbal mount.  This coupling, plus the gimbal bearings on which the
>flywheel assembly pivots, needs to be just as frictionless as the ones the
>flywheel spins on -- any heat produced here is energy drained from the
>"battery".  This ain't gonna be cheap!  Nor is it likely to survive long under
>the "maintenance habits" of the typical American car owner. 

I don't see the problem.  I mount the flywheel with its axis straight up.
Turns don't cause a problem, however banking and hill climbing do.  The
resistance to banking may actually be a plus, but lets assume for now that
it is undesirable.  OK so mount it in a gimbal mounting.  This allows that
flywheel to still point straight up as the car banks and goes up and down
hills.  Getting energy out is easy, just hook up the wires.  After all
the steepest banks and hills are under 30 degrees, so the flywheel is NOT
going to move much in its mounting.   This mounting need not be particularly
frictionless, (conventional bearings are MORE than adaquate, springs are
probably a possibility), since energy lost is proportional to movment which
there is simply not very much of.  The bearings the flywheel rests on will
experience NO MORE lateral force than is needed to move the whole flywheel
in its mounting (which is not very much).  By the same token, the car
can only experience that much undesirable force from the flywheel.  

By the way, every flywheel that I have seen that is designed for mass
energy storage uses magnetic bearings in a vacuum housing.  The bearings
are designed so that permanent magnets hold most of the flywheel up, and
electromagnets are used to keep the flywheel exactly in place (where it
touches nothing).  In theory such a system could be made to dissipate 
almost no power (in the current state of the art, spin ups can last
weeks).  Conventional bearings also surround the flywheel in case the
magnetic ones fail and for particularly bad jarring etc.  

Anyway, flywheels are definately a possibility.  They exist today as
experimental prototypes (see the Intersociety Conference on Energy 
Conversion Engineering for more information).  

Personally I see them only possibly being used in the transportation
sector in buses (where they can be recharged every 10-20 miles or so)  
That way the flywheels can be smaller, and hence safer and cheaper 
to make.  Also buses REALLY need the high power density and long 
life (many charge discharge cycles) that flywheels can give.

Vance
Xref: sparky sci.electronics:21038 sci.energy:6224 rec.autos.tech:16848
From: stead@skadi.CSS.GOV (Richard Stead)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 18 Dec 92 00:39:19 GMT
Followup-To: sci.energy

In article <1992Dec17.205631.9731@u.washington.edu>, basiji@stein.u.washington.edu (David Basiji) writes:
> 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.

What?  Those covalent bonds aren't going to use up very much energy, it ain't
hard to break them.  In fact, breaking them likely has a net release of
energy.  Why do you think plastic gets hot when you stretch it?  Part of the
heat is the unrecoverable work you do on the bonds to stretch the material,
and part is the release of energy after breaking the bonds.  I've seen a
dramatic demonstration of this by putting a thick polymer cable under tension.
When it fails, it does so explosively and the material melts.

The "time" you seem so interested in regarding the housing is meaningless.
the particles are traveling so fast that they have a cratering interaction
with the housing - they and the housing they impact will melt - there is
no such thing as elastic collisions at these velocities.  The idea of
bits of rotor bouncing off the housing is a complete fallacy.  The regime
is one of melting and shock waves.  The rotor is most likely completely
destroyed by the time it interacts with the housing - the shock wave from
the failure would likely melt it.  The molten bits would still have
hypervelocity, and still melt the housing.


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Re: Microelectronics newsgroup
Date: 17 Dec 92 12:35:06 GMT
Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Organization: Dept Electrical and Electronic Eng, Manchester University, UK

In article <sehari.724353196@class1.iastate.edu> sehari@iastate.edu (Babak Sehari) writes:
>In <javadi.834518132@genetics.com> javadi@genetics.com (Mountain Man) writes:
>
>for example my vote looks like this:
>
>sehari@iastate.edu, Babak  Sehari, yes
>

Careful, this could be considered as "Influencing the vote"



--
______________________________________________________________________
Multimedia Information Systems Lab | I'm a slug and I'm alright
Dept. Of Electrical Engineering    | That's 'cos I'm hermaphrodite
University of Manchester           | It bothers me not that I have no
Dover St. Manchester. M13 9PL      |                     friends
England                            | 'Cos I have fun with both my ends
Newsgroups: sci.electronics
From: dlowe@world.std.com (Miller Lowe)
Subject: Origin of 'BNC'
Summary: What does BNC Stand For (Question)
Keywords: BNC CONNECTORS HISTORY QUESTION
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 15 Dec 1992 22:06:38 GMT

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.


Please Please help !!!

D. Miller Lowe
(No Title Deserved)

Please post an answer or EMAIL a reply to dlowe@world.std.com

Thanks in advance..
From: srgxnbs@grace.cri.nz
Newsgroups: sci.electronics
Subject: Rotary absolute position encoding
Date: 21 Dec 92 01:25:18 GMT
Organization: Industrial Research Ltd., New Zealand.
NNTP-Posting-Host: grv.grace.cri.nz

I have a couple of questions relating to rotary (absolute) encoding:
1. Apart from Grey (gray?) code, are there any other forms of rotary
code available.
2. Are there formulae, rules etc available to allow these to be 
generated (automatically)?
3. Rererences on the subject anyone?

 :
I should say that I'm referring to digital and not analog methods.

thanks in anticipation
Bruce
Newsgroups: sci.electronics
From: whit@carson.u.washington.edu (John Whitmore)
Subject: Re: "The Glob" Atari 2600 processors ???
Organization: University of Washington, Seattle
Date: Fri, 18 Dec 1992 05:18:31 GMT

In article <kennehra.724560313@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
>
>
>Hi.  I opened up one of my atari 2600 games, and instead of a regular
>chip inside, there was this small plastic glob where the ROM chip    
>should be!!!! 

	It's a blob-packaged ROM chip.  Some manufacturers support
a direct chip-on-board mounting for their products (Rockwell is
one, and IBM and Intel have done it as well).  This saves money 
(not much), and is showing up in a few consumer items.

	Some chip houses, of course, will not ship dice, only
packaged IC's; you can't rip the chip out after it has been
packaged.  And, it may be awkward to do final QC (full testing
of the chip) without putting it in a standard DIP or other package
first.

	John Whitmore




Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: Toroid 60Hz power transformer source?
Organization: SSC, Inc.,  Seattle, WA
Date: Thu, 17 Dec 1992 01:03:59 GMT
X-Newsreader: TIN [version 1.1 PL6]

TIM SHOPPA (shoppa@almach.caltech.edu) wrote:
: center-tapped, at a few V-A's. As I understand, Toroid transformers can have a
: much smaller radiated EM field than usual transformers. 
: 	There are several manufacturers of toroidal power transformers,
: but they all seem to want an arm and a leg ($50+) for even the smallest
: transformers.  Does anyone know of a more inexpensive source for these?

Active Electronics has some in their catalog for about $15 less than
that.

: I'm looking
: for the sort of information Amidon gives on their cores - sort of a cookbook
: procedure on how to make your own transformer.

Try 'Practical Transformer Design Handbook' by Eric Lowdon, 
Howard W. Sams, 1980

It has some data on Toroid transformers with tape wound cores.

Mark Zenier  markz@ssc.wa.com  

Newsgroups: sci.electronics
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: "The Glob" Atari 2600 processors ???
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Fri, 18 Dec 1992 12:55:53 GMT
X-Newsreader: TIN [version 1.1 PL6]

The I.C. is surface mounted to the board and then covered with 
a glob of epoxy. 
Newsgroups: sci.electronics
From: grnwood@gagme.chi.il.us (Jerry Greenwood)
Subject: Re: Phone taps/other extensions up
Originator: grnwood@gagme
Organization: Gagme Public Access UNIX, Chicago, Illinois.
Date: Sun, 13 Dec 1992 15:44:13 GMT

I had one of these devices.  I can't help you on where to get one but they
are cheap and should be readily available at electronic specialty stores.
If they don't have'm ask to look in a catalog to order one special.  

They are simply devices that plug into an existing telephone jack and
measure the line resistance.  There is a gree and red led one the device.
The green one is lit all the time.  If the line resistance drops, the red
led lights up.  This will let you know if anyone picks up or turns on
anything while you are on the phone.

these devices should be REAL EASY to make.  I'm sure that someone out there
in electronic land could tell us what we need to know.  

Jerry

-- 

Submitted for your approval.....
Jerry Greenwood                                                      N9NRG
grnwood@gagme.chi.il.us                                       312-545-2219
                                   1st of 6       
--
From: rpmackin@student.business.uwo.ca (Robert Patrick MacKin)
Newsgroups: sci.electronics
Subject: HELP: I need pinout for MEDL AMA5263PLK (DTMF GEN?)
Date: 14 Dec 92 22:02:20 GMT
Organization: University of Western Ontario

I need the pinout for a chip in a British Telecom issue Butt Set.
I need it to generate A B C and D therefore I need to know if the chip
supports the 4th col.
the keypad matrix goes to a MEDL AMA5263PLK chip.
could anyone shed some light on the pinout ?
thanks...


rpmackin@student.business.uwo.ca (Robert Patrick MacKin)
Western Business School  --  London, Ontario
Newsgroups: sci.electronics
From: kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan)
Subject: "The Glob" Atari 2600 processors ???
Organization: Clarkson University
Date: Thu, 17 Dec 1992 02:45:13 GMT



Hi.  I opened up one of my atari 2600 games, and instead of a regular
chip inside, there was this small plastic glob where the ROM chip    
should be!!!!   what is this?  It was black and looked like a big
bump of solder.  How is this possible for a black glob of plastic
with no pins to be able to store information?  The black glob was like
melted into the center of the PC board...and the game worked perfectly
when I put it back together again.  Any help figuring out this mystery
would be greatly appreciated!! 

- Rich
  kennehra@logic.camp.clarkson.edu
From: sr3745@dean1.usma.edu (Roeber Rodney MAJ)
Newsgroups: sci.electronics
Subject: Re: DTMF decoder
Date: 12 Dec 92 14:48:01 GMT
Reply-To: sr3745@dean1.UUCP (MAJ Rodney B. Roeber)
Organization: US Military Academy, West Point, NY

In article <1992Dec10.205414.18031@kocrsv01.delcoelect.com> c23jld@kocrsv01.delcoelect.com (Jeff Day) writes:
>
>Could someone post an ASCII schematic of how one
>would interface a DTMF decoder chip and/or a voice synthesizer
>chip to the phone line.
>-- 
>--
>Jeff Day                               Domain: c23jld@kocrsv01.delcoelect.com
>Powertrain Electronics Software Engr.  UUCP:   deas!c23jld
>Delco Electronics Corporation         

There is a project in Circuit Cellar Ink (June/July 1991 - Issue 21) that 
describes what you are asking for.  The schematic is too complex for me
to reproduce with ascii characters, though.  You can get a back issue from:

Circuit Cellar Incorporated
4 Park Street, Suite 20
Vernon CT  06066
(203) 875-2751
BBS (203) 871-1988

This project uses an 8052 uP, SSI204 DTMF decoder, XECOM XE0002 DAA, and
the RC Systems V8600 voice synthesizer.  It's a nice project designed
as a telephone interface for home automation/monitoring.  Sorry to
sound so much like an advertisement.  I'm using the project as a basis for my
own but I'm using a different uP.  Also, <disclaimer follows> I'm not
associated with Circuit Cellar other than being a satisfied subscriber.
Newsgroups: sci.electronics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: Switching speakers on during loud volumes
Originator: sehari@class1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Tue, 15 Dec 1992 19:21:37 GMT

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
pass all the lower frequencies unaffected.

                      With highest regards,
                           Babak   Sehari.

--
From: brendan@otc.otca.oz (Brendan Jones)
Newsgroups: sci.electronics
Subject: Re: Various national colour code of wires...
Date: 15 Dec 92 23:18:16 GMT

in article <519@bit.UUCP>, grego@bit.UUCP (Greg Sanguinetti) says:
> You don't need a licence in the States to wire your house.

Hmm... and how many people are electrocuted in the US each year?  How much
are house insurance premiums?  How often to houses burn down through
electrical faults?

> Anybody reading sci.electronics should have more than enough basic knowlege
> to figure out house wiring. It's real easy. Sorry Brendan but I found your
> tone a bit condesending.

Yes, well I thought house wiring was trivial before I did my electricians'
course and I have an Electrical Engineering degree with Honours from a 
university.  I now know differently.

There's more to it than identifying which wire is the active, especially if
you're doing an entire house installation from the switchboard.

There's a whole range of practical subleties, ranging from how often to
support a wiring installation, how to derate it in the presence of insulation,
how to properly terminate connection, how to earth correctly, how to maintain
proper insulation at junction blocks, under what conditions you can safely run
a phone line with a power line, where double insulation is required, etc etc.

It's not just a matter of electrical theory, and tinkering with a breadboard
(or reading sci.electronics) doesn't qualify you to safely play with 110V or
240V.  A little knowledge can be a dangerous thing, an in the case of house
wiring, deadly.

There's nothing worse than someone who doesn't know what they don't know.
At least now I know what I don't know, and am much more respectful of mains
electricity.

> Anyway, the color codes you described are unfortunately opposite US N.E.C.
> codes and are therefore very dangerous to use.

I mentioned quite clearly they are the IEC codes.  If the US doesn't follow
international conventions then that's the US's problem.

-- 
Brendan Jones  | ACSnet:  brendan@otc.otca.oz.au               | This space
R&D Contractor |   UUCP:  {uunet,mcvax}!otc.otca.oz.au!brendan | for lease
Network Access |  Phone:  (02)287-3128    Fax:  (02)287-3299   | pending new
|||| OTC ||    |  Snail:  GPO Box 7000 Sydney 2001, AUSTRALIA  | .sig
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: pierson@cimcad.enet.dec.com (Dave Pierson)
Subject: Re: Flywheel batteries as EV power source
Organization: Digital Equipment Corporation
Date: 18 DEC 92 18:29:27    

Some numbers, since this (recent) issue of Autoweek was lying about:

Ford Ecostar Van
Base Price:	$120,000 dollars	!
		three phase, ac motor, 75 HP (I assume thats steady state)
		800 pounds of batteries (lead/acid)
		20 MILES range.
		0-50 12 seconds, 70 MPH top speed.

Sodium/Sulphur in next model, estimated to give 100 miles.

Useful figures of merit for batteries, etc:
	watt-hours/lb, /cubic foot, etc.
	Either of those/dollar.

Current Electronic Products trade mag has a lot of battery comprisons.  Aimed at
the portable electronics market, but scalable.

(Auto Week has had a respectable about of electric vehicle news, imo...)

	As to why the electrics on the flywheel, why not gear direct?  As the
	energy is withdrawn, the flywheel slows.  So does the vehicle, without
	the electrics....  Some "gearing" is needed, since the "fully charged"
	flywheel will be at near (above??  FAR ABOVE?) sonic velocities...

thanks
dave pierson			|the facts, as accurately as i can manage,
Digital Equipment Corporation	|the opinions, my own.
40 Old Bolton Rd		|I am the NRA.
Stow, Mass 01775 USA		pierson@msd26.enet.dec.com
"He has read everything, and, to his credit, written nothing."  A J Raffles
From: jon@vector0.SAC.CA.US  (Dazed N. Confused)
Newsgroups: sci.electronics
Subject: Re: Is there a FAQ file for sci.electronics?
Date: Wed, 16 Dec 92 12:09:39 PST
Organization: Vector Zero

jbs4930@usl.edu (Scott Jeffrey B) writes:

> Nope.  My original question was, "Is there a FAQ *FILE*"

     I'm getting the idea that there really should be one..  How many
more times do we need to see anti-barker or DTMF tone or
stun-gun threads?

     Anyone, anyone?  Care to volunteer?


--Jon

   jon@vector0.SAC.CA.US                     Life is like a kiwi.
From: bruce@corona.syd.ips.oz.au (Bruce Paterson)
Subject: crystal filter with bessel response sought.
Originator: bruce@corona.syd.ips.oz.au
Reply-To: bruce@ips.oz.au (Bruce Paterson)
Organization: IPS Radio and Space Services.  Sydney, Australia.
Date: Mon, 14 Dec 1992 06:47:21 GMT

A supplier is sought for a multi-pole crystal filter as follows:
Center Frequency: can be chosen to suit at this stage but should be 40MHz
or above - 70 MHz would be very nice.
3dB Bandwidth: 30 kHz (or two filters of 42kHz)
Terminal impedance: The circuit can be adapted to suit, but around 1k Ohm
would be nice.
Ultimate Attenuation: >100dB desired, but some additional LC circuits can
be added to help remove far away spurious responses.
Shape: Bessel - desirably 8 (or more) poles. THIS IS THE HARD PART!

I can easily get equi-ripple type designs but they will not do here.
As I only want a few, a special design is just not economic.
Does anybody know if such a filter is already made?
Newsgroups: sci.electronics