HDTenEightyP/NetNews huggingface dataset:
From: srfergu@rufus.erenj.com (Scott Ferguson)
Subject: Re: Smith Chart
Organization: Exxon Research & Engineering Co.
Distribution: usa
Date: Wed, 14 Oct 1992 12:46:54 GMT

In article <1992Oct12.173419.17078@athena.cs.uga.edu>, mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
|> In article <1992Oct12.112607.13870@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
|> ...
|> >I realize that if you have _the_ Smith chart produced by ??? Electric, you
|> >can't copy it -- just like a book.  But if you regenerate the plot from the
|> >mathematical model?  This seems odd to me...  if so, pretty soon people
|> >will want to copyright things like the Mandelbrot set, etc.!
|> 
|> not the function itself.  If he had wanted to restrict the _use_ of
|> this plotted function as a means of calculating complex impedances, he
|> should have gotten a patent rather than a copyright.  And he didn't.
|> 

	While it's gone in and out of the patent law, I believe it's not allowed
	in the patent law to patent a mathematical theory. For instance, if
	Newton had a patent on f = ma, you'd have to pay a royalty every time
	an apple fell on your head, every time you fell down, etc.

	I'd presume the same principle would make the math behind the Smith Chart
	non-patentable.
-- 
----------------------------------------------------------------------
Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      Route 22 East, Room CC113
(908) 730-2339                        Annandale, NJ 08801
----------------------------------------------------------------------
"Without life itself, chemicals would be impossible."

Newsgroups: sci.electronics
From: jim@rwsys.lonestar.org (James T. Wyatt)
Subject: Re: Electronics magazines & Mail order brides
Organization: R/W Systems, Richland Hills, Texas, USA, 76118-5849
Date: Wed, 7 Oct 1992 06:06:59 GMT
Summary: Don't even pretend to believe this...

In article <kennehra.718236463@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
>Hi.  I was flipping through the back sections of one of my electronics
>magazines when I saw these ads advertising "attractive asian ladies
>who seek friendship, marriage..."  Could someone PLEASE tell me why
>a company like that would advertise in an Electronics magazine?!?!
>Has anyone ever answered these ads?!?!  

Hey! That's how I met my wife! 8{D  Ordering children is tougher... 8{)

>This is something "consumer
>reports" should definitely check out!!!

The tough part is warranty repair, but Dahlmer's Spare Parts helps.

btw: If you believe this pile of lies, you'll believe anything. I'm just
glad she doesn't read *this* group! In fact this entire article was a
late night forgery.
-- 
James Wyatt  KA5VJL  jim@rwsys.lonestar.org  Semper Gumbi - always flexible!
From: phillip@BARTAL.COM (Phillip M. Vogel)
Newsgroups: sci.electronics
Subject: Re: Can despiking caps be connected to a central ground?
Date: 9 Oct 92 11:04:52 GMT
Organization: Bartal Design Group, Inc.

In article <7480126@hpfcso.FC.HP.COM> myers@hpfcso.FC.HP.COM (Bob Myers) writes:
>>     The answer is THEY must go between VCC and GROUND on the SAME
>>     chip.  The reason for a despiking cap is the momentary
>>     current rush caused by switchIno@in DRAMs and some other
>>     chips.  The cap supplies the current needing for these chips
>>     and prevents them from degrading the powersupply.  By
>>     placeing them not Immediatly to the chips ground you are
>>     totally defeating thier purpose.
>> 
>
>No, they do NOT need to go on the same IC if that means longer cap leads
>than simply tying to the nearest ground point.  Assuming a board with
>power/ground planes, or a power/ground "grid" as Henry mentioned (easily
>"do-able" on a wire-wrap board, this may mean that the caps tie to power and
>ground *between* adjacent ICs.  Distributing the capacitance across the
>power plane is the key, not tying the caps to a given chip.
>
>
>Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
>                   User Interface Tech. Div.|those of my employer or any other
>myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Actually, you're both right. The fact is, it depends on several factors. Yes,
in many cases anywhere in the neighborhodd on the power/ground planes is close
enough, but for really high frequency / high current / low noise applications,
you have to do better than 'close enough'.  A typical arrangement would be to
have the cap adjacent to the VCC lead of the IC, connected by a VERY short 
trace. The ground lead from the chip is then connected to the other side of the
cap, and then to the ground plane. By doing this, the cap is placed as close as
possible to the point where the chip is drawing current out of the power 
distribution network.

Another point to ponder is that there are resonances to consider. Almost all
the time this can be ignored, but, IMHO, a resonance in the power system is
one of the biggest pains in the butt to nail down.

Phillip
--
Phillip M. Vogel, President             | "I like pussy, but I don't like Bush"
Bartal Design Group, Inc.               | Domain: phillip@bartal.com
318 Marlboro Road, Englewood, NJ 07631  | (201)567-1343   FAX:(201)568-2891
From: zot@toz.buffalo.ny.us (Chris Boebel)
Newsgroups: sci.electronics
Subject: bearcat scanners
Date: 12 Oct 92 23:51:25 GMT
Organization: The Tower of Zot - (716)8338-616

I'd like to modify my bearcat 855xlt scanner to receive cellular 
frequencies. How do I go about this?>

Chris

---------------------------------------------------------------------------
zot@toz.buffalo.ny.us : The Tower of Zot (716)691-3865 Dual Standard
"I could live a million." - REM "Forward he cried from the rear" - Floyd 
---------------------------------------------------------------------------
Newsgroups: sci.electronics
From: gould@theory.TC.Cornell.EDU (EWD)
Subject: Re: C Cross Complier for 68HC11 
Organization: Cornell Theory Center
Distribution: na
Date: Mon, 12 Oct 1992 23:17:17 GMT

In article <Bw0vr2.6qw@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
>In article <1992Oct12.065939.3280@rtfm.mlb.fl.us> luckey@rtfm.mlb.fl.us (Jon Luckey) writes:
>>P S.  I've always wondered if they had a way to use GNU's
>>gcc as a cross compiler for embedded systems
>
>My understanding is that there's not much hope for this, because GCC has
>some definite prejudices about the type of machine that it's compiling
>for, and "at least 32 bits" is one of them.
>-- 

Some stuff concerning gcc being scaled down has been on comp.compilers
recently.  Somebody wrote:

>I just received the latest issue of Circuit Cellar Ink today.  On page 7
>in the new products section the GCB11 68HC11F1 based SBC was announced.
>The SBC comes with a port of GNU C for the 6811 with DOS as the host
>environment for the cross compiler.  Complete source is supposedly
>supplied (I interpret this to include source for GNU C).  No mention is
>made of which version of GNU C is supplied.  The price for the SBC with
>all software (including GNU C) is listed as having a price of $179
>(presumably in single quantities).
>
>I'm thinking of getting this SBC just to get the port of GNU C.  Thanks
>to the GPL, even if they don't supply source for GNU C, I'll still be
>able to get it from them (in theory).
>
>The company selling this is Coactive Asthetics, Inc.; P.O. Box #425967;
>San Francisco, CA 94142; Voice: 415-626-5152; FAX: 415-626-6320.
>
>Hopefully the 6811 bits will get rolled back into the standard distribution
>of GNU C at some point.

Also somebodey pointed to a gcc configuration for the mc6809 at

larry.sal.wisc.edu /pub/gcc/mc6809

This has all gotten my hopes up regarding a configuration for z80 or z280.
Any info anyone?


Eliot W. Dudley
RD 1, Box 66
Cato, New York   13033
315 626 2878
edudley@mailbox.syr.edu
Newsgroups: sci.electronics
From: mts@wam.umd.edu ()
Subject: Re: Voice-operated Universal Remote Control
Organization: University of Maryland, College Park
Date: Fri, 16 Oct 1992 03:47:13 GMT

In article <1bjg0tINNk9q@mizar.usc.edu> hazelton@mizar.usc.edu (John W. Hazelton) writes:
>I heard the same advertisement a couple of months ago.  The remote
>control is sold by Voice Powered Technology in Canoga Park, California.
>It does indeed work from voice command.  It is a very simple looking
>device with a microphone built into it.  It appears that you program
>it with your voice when you first receive it (get it to learn how you
>say "one," "two," "Monday," "AM," etc.).  It then acts a lot like a
>VCR+ Plus, in that it controls the VCR as long as you have the thing
>pointed at your VCR while you are gone.
>
     If this actually works, why don't the VCR manufacturers just build 
voice controls into the VCR itself?  Then you could also have playbeck voice
commands and change channels etc.

Dave.
.
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: why is one prong on plug wider than the other?
Date: 9 Oct 92 01:26:45 GMT
Distribution: usa
Organization: AI Programs, University of Georgia, Athens

In article <1992Oct8.205505.16186@husc3.harvard.edu> mlevin@husc8.harvard.edu (Michael Levin) writes:
>
>    I am holding a plug, which is supposed to plug into a wall socket.
>One of the two metal prongs is wider, so that the plug only fits one
>way - not if you turn it over. Why is this? I thought the whole point
>of AC was that the poles change sinusoidally; so how can one be
>different from the other? Please direct replies to
>mlevin@husc8.harvard.edu.

One side of the line is grounded to the earth so that the potential between
line and ground will never be excessively high; this is a safety measure.

Switches and fuses should always be in the *ungrounded* side of the line,
so that when a switch opens or a fuse blows, the whole piece of equipment
will be at ground potential.  Otherwise, even with the fuse blown, the
equipment could still present a shock hazard to someone in contact with
the ground.

The wider side of the plug is the grounded side.


-- 
:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:- Artificial Intelligence Programs       phone 706 542-0359
:- The University of Georgia                fax 706 542-0349
:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI
From: eronald@CNAM.CNAM.FR (Edmund Ronald)
Newsgroups: sci.electronics
Subject: FCC approval.
Date: 15 Oct 92 21:45:14 GMT
Article-I.D.: cnam.199210152145.AA02402

I have designed a computre peripheral, and am told I need FCC approval
before I market it. I would like to discuss matters with people who've 
already had to deal with FCC matters.
Thanx.
-reply by email please.

Edmund.
From: bo24+@andrew.cmu.edu (Berend Ozceri)
Newsgroups: sci.electronics
Subject: Stepper motors...
Date: 11 Oct 92 13:07:39 GMT
Organization: Carnegie Mellon, Pittsburgh, PA

Hi!

I would like to know where I can look for some introductory information
on stepper motors and stepper motor control circuits. Please send me
names of books and all other related stuff.

Thanks in advance.

-Berend
From: zoltar@glasgow.amigans.gen.nz (Grant Thoms)
Newsgroups: sci.electronics
Subject: Re: Small audio device
Date: 11 Oct 92 22:05:51 PST
Distribution: world
Organization: .SIG Laboratories.. New Zealand division.

In article <4XkcsB2w165w@sys6626.bison.mb.ca> flux@sys6626.bison.mb.ca (John Kamchen) writes:
>Where could I find plans for a small, ultra simple wire-less
>mike ?  I do alot of video work, and would like to use a wireless on 
>occasion.  Radio SHack used to sell a device, for $100, but it didn't 
>work well in the sunlight.
>I don't care if it's a 'wee-bit' past what the FCC wants.. I'm a 
>Canadian, who care about the FCC.
>A 100 to 200ft range would be just fine.
>-John

Hi John,

I don't know wether you have `Dick Smith Electronics' there or not
nut they sell a FM wireless Microphone kit for NZ$29.95 it says the signals
are transmiited to any FM radio at about 90MHz.

We had a wireless microphone (TOA to be exact) on a video course I was on,
and it was excellent.. If you are a bit of a electronics wizz, you may
even be able to `convert' a walkie talkie.... 

Cheers,
Grant
-- 
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
        Grant Thoms (Zoltar) Co-Sysop of `Silent Imperium' BBS
  //                Zoltar@Glasgow.Amigans.Gen.NZ
\X/                             ----
         Standard Quote: `Insert $10 for the next 0.5 seconds'
                *** Opinions expressed are my own ***
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\


Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.swap
From: Remco.Denbesten@bbs.oit.unc.edu (Remco Denbesten)
Subject: BAT31 noise diode or eq. wanted
Organization: Extended Bulletin Board Service
Date: Thu, 15 Oct 1992 09:37:11 GMT


I'm looking for a BAT31 (Siemens) noise diode to make a noise source
for my noisefigure meter. Perhaps there is an American or Japanese
equivalent available. Anyone who has any information, please contact
me via: besten@chem.ruu.nl

Thanks, Remco (PA3FYM)

--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  bbs.oit.unc.edu or 152.2.22.80
From: an938@cleveland.Freenet.Edu (George II Lenzer)
Newsgroups: sci.electronics
Subject: TV->RGB hookup?
Date: 7 Oct 1992 17:05:43 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc4.ins.cwru.edu


	I was fooling around with an RGB monitor and an Amiga
computer and got the two to work together.  After I thought about
this for a while, and idea came to me.  Is it possible to get an
RGB output from a television and connect it to my RGB monitor?
Then I thought, if I can fing the right points to make the 
connexions, could I use a television as a lowgrade RGB monitor.
So; I explored.  I opened up my 13" Emerson television and began
looking for the RGB signals.  After taking all the neccessary 
precautions to avoid electrocution, I checked the voltages of th
RGB signals and found them to be 2.8v.  Since I don't have a scope,
I couldn't find the horizontal and vertical sync signals.  I 
guessed that they may have been at the H and V hold pots, but that
may have been wrong.  I haven't been able to find a SAMS fotofact 
folder for my television so I think I'm out of luck.  Anyway,
I did get (sort of) a picture from my Amiga on the television.  It
was unsynced, but the colours looked right.  Now, my question:
Is the NTSC standard compatible with RGB?  I remember seeing some
info somewhere on it implying that it is.  Or, am I on a wild
goose chase?  Is it possible to extract an RGB signal from a 
composite video signal?  I would like to use my monitor for double
duty with a VCR.  Any suggestions would be appreciated.

						Thanx,
						George II Lenzer

-- 
"I'll let you in on a little secret.
	The whole universe is totally INSANE!!!!"
						Mr. Natural

Newsgroups: sci.electronics
From: smasters@fame.gmu.edu (Shawn C. Masters)
Subject: Display boards
Keywords: Big outdoors display digital
Reply-To: smasters@gmu.edu
Organization: George Mason University
Date: Thu, 8 Oct 1992 15:02:24 GMT

	I'm looking for a board that can display alphanumerics on the order of 4 inches high(give or
take a few inches).  I've been told that it is to be used outdoors for display.  Since I'm building
the computer control, any digital interface is acceptable(some more then others :-).
	Another possibility might be an analog vector type display of a very large size.  I'd
appreciate any leads on either of these items.  Thanks.

Shawn


-- 
Shawn C. Masters
smasters@gmu.edu

	I speak for myself, not my deptartment or institution.
Newsgroups: sci.electronics
From: martinez@rodan.acs.syr.edu (Kenneth Mtz. (YONIX))
Subject: DC Motors controlled by PCM
Originator: martinez@rodan.acs.syr.edu
Organization: Syracuse University, Syracuse, NY
Date: Tue, 13 Oct 92 12:22:23 EDT


  we've been told to use DC reversible motors for our micromouse 
  project and that pcm would help us regulate the speed with which
  the wheels spin...    Could anyone explain exactly how this works?
  and maybe even describe e how PCM is physically implemented?

  Thank you in advance
  Kenn.

  I would appreciate a personal response. Will post a summary if 
  others are interested.

  martinez@rodan.acs.syr.edu

Newsgroups: sci.electronics
From: wrb@cbnews.cb.att.com (wallace.r.blackburn)
Subject: Re: WANTED: 8052-Basic Controller Board
Organization: AT&T
Distribution: usa
Date: Thu, 15 Oct 1992 14:49:11 GMT

In article <67724@cup.portal.com> rduflon@cup.portal.com (Raymond H DuFlon) writes:
>I'm looking to buy a new or used 8052-Basic based microcontroller board.  It
>will be the "brains" of a simple robot under development by a third grade
>class, so price is somewhat important.  If you have one to sell or know of
>any that are commercially available, your response is appreciated!
>
>Ray
>rduflon@cup.portal.com

The latest (11/92) issue of ComputerCraft has an article listing available
controller boards.  I see a few 8052-Basic boards.  Not terribly cheap, but
why can't 3rd graders learn assembly language?!  Just kidding.  Here's what
I see under $200:


	Micromint BCC52 - $189; requires +5V and +-12V supplies (yuk)

	Prologic Design BASCOM1 - $120; requires +5V +12.5V (yuk again)

	STD-Micro Controls TCU-2R - $125; 24VDC or 24VAC (what are these
	                            people thinking?)

	Basicon MC-1i - $198; only +5V, 24 I/O lines; 2 serial ports


Hmmm.  Only the last one seems reasonable.  The others seem more suited for
fixed control applications.


	Micromint 1-800-6353355
	Prologic Design PO box 19026, Baltimore MD, 21204 (no phone #)
	STD Micro Controls - not listed.
	Basicon 503-626-1012


	Hope this helps,

	Wally Blackburn AA8DX
From: A2HQC@CUNYVM.BITNET
Newsgroups: sci.electronics
Subject: Looking for a good PD Circuit Board Layout Program
Date: 14 Oct 92 03:04:36 GMT
Organization: City University of New York/ University Computer Center

Like the subject title says I would like a GOOD PD PCB layout program. Any
suggestions would be appreciated. Thanks.

                                         Mark Kurzawa
From: livefree@apres.UUCP (J.P. Wieser)
Newsgroups: sci.electronics
Subject: Manual needed
Date: Sun, 11 Oct 92 23:22:56 CDT
Organization: Applied Research, Cary, Illinois

     I need a manual and schematic for a model MW-511 well-type 
scintillation counter, manufactured around 1973 by General Medical Systems. 
Anyone have any ideas? Especially interested in the three unpopulated chip 
sockets on the LED display board and the unpopulated 40-pin conector area 
that is labeled "COMPUTER"!

--
livefree@apres.UUCP (J.P. Wieser)
Applied Research (cryptography & security BBS)  1 708 639 8853
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: DC rail capacitors
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL6]
Date: Fri, 16 Oct 1992 19:17:33 GMT


: The large capacitor (probably electrolytic) is for filtering low frequency
: noise - the small one (a capacitor with good high-frequency performance) for
: eliminating high frequency noise.
: 
: Eric Covingcton
: covingc@ee.tamu.edu

IMPORTANT:	HF-noises oder better hf-spikes don't come only from
		outside of circuit. High-current in output-stages
		of digital ic's make hf-spikes during transients.
		Capacitors with very low inductance must supply
		the ic during this hf-spikes. Therefore these capa-
		citors must be in keramic or similar. Such capacitors
		must be very close with Vcc and GND of digital ic.
		Very important with very fast cmos, as example
		ACMOS (advanced cmos): Every ic a chipcapacitor!

Greatings from Thomas
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: flouresent lighting
Date: 11 Oct 92 01:40:37 GMT
X-Maildoor: WaflineMail 1.00r


   Jason Goga was espousing about 'flouresent lighting',
   on [10-08-92  21:11] to All!
 JG> In chemistry class the teacher was illustrating flouresent lighting,
 JG> and explained that the charge caused the electrons to leap into higher
 JG> energy levels, however not being able to sustain them they would fall
 JG> back down realeasing energy as light. Now I was curious, I've never
 JG> seen a flouresent light run from DC. so is it the constant returning
 JG> to 0 volts that causes the electrons to fall back down or do they do
 JG> so on their own accord?

    A flouresent lamp works this way:

        A photon of UV wavelength stirkes the phosphorescent
        coating on the tube (white stuff) the phosphor is
        exciting to a higher state and then not being able to
        maintain it losses a specific amount of energy and
        returns to it's ground state.  This produces a different
        wavelength of light WHICH in fact is ussually lower.

        The UV light is produced by a low preasure gas inside the
        tube (I can't remember what they use).  You can run a
        fourescent of of high voltage DC.  AC is used because
        it's relatively common.

                Stephen Cyberman@Toz.Buffalo.NY.US
                Scripted at Sat  10-10-1992  16:06:22

... No sense being pessimistic.  It wouldn't work anyway.
--- Blue Wave/QWK v2.10
                          
Newsgroups: sci.electronics
From: peny@ppc.lpc.ethz.ch (Peter Nyffeler ,x4399)
Subject: experience with HIWIRE CAD ?
Reply-To: peny@ppc.lpc.ethz.ch
Organization: ETH-Zuerich, Physical-Chemistry-Lab. - Switzerland
Date: Wed, 14 Oct 1992 09:59:17 GMT

Has anyone experience with HIWIRE schematic capture and PCB layout program from Wintek ?

I use SMARTWORK from the same firm but would like to upgrade.

Peter Nyffeler
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: halogen lamps and infra-red emission
Keywords: halogen infra-red
Date: 16 Oct 92 20:51:54 GMT
Distribution: sci
Organization: AI Programs, University of Georgia, Athens

In article <Bw7tF2.BK7@lut.fi> tepponen@lut.fi (Jussi Tepponen) writes:
>ginger@hydrus.trl.OZ.AU (Jeremy Ginger) writes:
>
>
>>I was "told" that halogen lamps emit infra-red rays.
>>If so what sort of effect do they have on humans,
>
>They might emit some infra-red rays (heat), but they
>also emit UV-rays (from the high frequency end of spectrum)
>These UV-rays might be harmfull for humans & animals.

You all are talking as if these "rays" were totally mysterious things.
Look up blackbody radiation in any physics book.  These rays are just
like light, but with wavelengths outside the visible region.

Because they are hotter than ordinary incandescents and because they
have a quartz rather than glass envelope, halogen bulbs presumably
emit more UV than ordinary bulbs.  But the proportion of UV would
still be lower than in sunlight.  It probably makes the light
_healthier_ rather than making it dangerous (UV is required for
vitamin D synthesis).


-- 
:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:- Artificial Intelligence Programs       phone 706 542-0359
:- The University of Georgia                fax 706 542-0349
:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI