HDTenEightyP/NetNews huggingface dataset:
From: rubin@chocktaw.cis.ohio-state.edu (Daniel Rubin)
Subject: Re: Laser speed gun detectors?
Organization: The Ohio State University, Department of Computer and Information Science
Date: Sun, 16 Aug 1992 17:31:20 GMT

>Someone told me there are already laser detectors
>around.  Is this true and how do they work?  I imagine
>the would not be very effective as the laser beam used
>to detect the speed is very directional and should only need
>to be on for a fraction of a second, once the car has 
>been sighted.  Radar detectors depend on detecting when a
>car ahead of your car is being gunned.  I can't see you detecting
>the laser until it is too late.
>

Actually, yes there is a laser detector available and the device is
simpler and cheeper than a radar detector!  Cincinnati Microwave sells
one for only $99 and it works very well ( from what I have heard I do
not own one ).  I believe the laser beam is used as more of a scanning
beam than a single beam so it is fairly detectable.  It would be very 
hard for a police officer to point a single laser beam at a car moving at
a high rate of speed.  I would expect that also since the light within a
laser beam is coherent it would be very easy to determine it is present
even when it has bounced off of things like the automosphere...

							- Dan

-- 
  Daniel Joseph Rubin    |  "...A good football team for the alumni, parking
rubin@cis.ohio-state.edu |  for the faculty and sex for the students."
      GO        GO       |  - President E. Gordon Gee on the three things that
    BENGALS  BUCKEYES    |  a great university president must provide.....
Newsgroups: sci.electronics
From: keithl@klic.rain.com (Keith Lofstrom)
Subject: Re: Craftsmanship is dying
Organization: Keith Lofstrom Integrated Circuits
Date: Wed, 12 Aug 1992 21:40:26 GMT

In article <1992Aug11.154718.14389@bwdls61.bnr.ca> mleech@bnr.ca (Marcus Leech) writes:
>In article <MOTOYAMA.92Aug11183427@harlgw92.harl.hitachi>, motoyama@harl.hitachi (Hiroshi Motoyama) writes:
>|> ...       Yes, all of those things are obsolete today when 
>|> craftsmanship in electronics is dying, or at least, getting invisible.

Craftsmanship can come in many forms.  Most of the craftsmanship in electronics
is down inside the chip; i.e., the Gilbert multiplier (and the translinear
principle in general), the Brokaw bandgap reference, the switched-capacitor
DAC.  The Dual-Slope and Quad-Slope A/D.  Other things, like the Sigma-Delta
A-D, miss being elegant due to the complexity of their implementation, but
are impressive uses of the technology nonetheless (My analog bias is showing).

At the macro scale, I am most impressed by equipment that is inexpensive, but
works well.  The Bird RF Wattmeter is a design that has been around for decades,
and still the best.  The first TI electronic watch - mine kept time within
1/2 second for months.  The Atari 400(?) video game:  simple, with inexpensive
components, but all in the right places, and not a kludge anywhere. I once 
cleaned a few ounces of peanut butter, dust, and other child debris out of one
of these - it was no mistake that the crud that managed to get in was
deflected from the critical components.  The 3M cartridge tape tensioning belt
is deeply clever: by the careful curvature of those two little white rollers
on the outside corners, and the elasticity of the band, the tape is kept
centered on the rollers and properly tensioned.

For me, craftsmanship shows in simplicity, robustness, and the appropriate
use of materials.  If there is mathematical reasoning, or psychology, or
a long view of the future incorporated into the design, I am delighted when
careful study reveals it.  In the past, there were horribly bad design errors,
shoddy workmanship, and inappropriate use of equipment, but mistakes have a
way of removing themselves from our view - what we still see from the past
was that small fraction of things that were designed to survive.  When you
look at how little of it is around, compared to how much stuff there must 
have been, you don't feel as bad about the 95% garbage that is being produced
now.  This, too, shall pass.  

Keith
-- 
Keith Lofstrom         keithl@klic.rain.com       Voice (503)-520-1993
KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
Design Contracting in Bipolar and CMOS - Analog, Digital, and Power ICs
Newsgroups: sci.electronics
From: harry@fstgds01.tu-graz.ac.at (Harald Prettner)
Subject: sc61860a02 8bitcmosprocessor help needed
Organization: Technical University of Graz, Austria
Date: Fri, 14 Aug 92 11:18:57 GMT



	Perhaps anybody knows what happens inside this uP when it gets
	the opcodes 4f, 6f ???

	extra question : what means phi(AL) ( this is a uppercase greek
	[fi] indexed by AL that means ADRESS-LATCH )? It's pin 3 on this
	chip.


	PLEASE PLEASE PLEASE post your answer in this newsgroup or
	send me EMAIL


	HARRY@EDVZ.TU-GRAZ.AC.AT                  THANX !!!!!!!!!!
	PRETTNER@FTUG.TU-GRAZ.AC.AT
	TEL 0043 316 873 6392
	
Newsgroups: sci.electronics
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Re: Electric Blankets and Sterility
Organization: U of Wisconsin-Madison College of Engineering
Date: 19 Aug 92 12:34:07 CDT
Keywords: Electric Blankets Sterility

In article <1992Aug19.170303.15912@uniwa.uwa.edu.au> gude@uniwa.uwa.edu.au (David J W Emrich) writes:
>Hi Netland!

[discusses EM field from electric blankets]

>  Does anyone have any more info on this.  ??

Yes, it's being hotly debated, along with the "Do power lines cause cancer?"
thread.  I'm not sure what the best newsgroup for this discussion is, though.
Sci.med has had some stuff on it in the past, though.

>Namely...
>1.  What does it mean to be "pre-disposed" toward sterility?

The national average for sterility is, say, 1 person is howevermany.  But,
if we took you and cloned you howevermany times, more than 1 of the clones
would probably become sterile.  (i.e., P(sterility|you're pre-disposed) >
P(sterility in general)

>2.  How long is "some period of time", months, years ?

One of the many debateable points of this issue.

>3.  Is there any field emitted when the blanket is switched off?

For all intents and purposes, no.  There's some very negligible field
left, but you'd be hard pressed to even measure it when the heating element is
off.

>4.  What about the cancer risk?

Got me.

>Obviously, the simple answer is, no one really knows yet, but it would
>be safer to use the device to just heat up a bed, and when one actually
>climbs in to bed, the blanket should be turned off.

That's certainly playing it safe.  There are plenty of other EM fields in
this world to worry about though.

Due to the way that electric blankets are constructed, it'd be very costly to
attempt to cut their EM field production.  Part of the EM debate though is
over whether just what frequencies of EM radiation are going to get you.
If we knew this, we could perhaps redesign power supplies to minimize human
injury.

							---Joel Kolstad
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Phone in use light - help!?
Keywords: phone light use light
Date: 22 Aug 92 19:46:29 GMT
Organization: University of Georgia, Athens

Build mine instead (forthcoming in Popular Electronics) -- its impedance
across the line is 66 megohms, well above the 0.7 megohm minimum.

CMOS to the rescue...

-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - don't tie education to an unpredictable income.
Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: Re: Why are 8 bit TTL binary counters so hard to find???
Organization: The John P. Robarts Research Institute, London, Ontario
Distribution: na
Date: Fri, 14 Aug 1992 03:34:06 GMT

In article <JON_SREE.92Aug13214342@world.std.com> jon_sree@world.std.com (Jon Sreekanth) writes:
>Maybe you could use a PAL or GAL like 22V10 ?
Yes, someone else has told me this via e-mail, and I will respond to that,
and others have informed me on other 74x replacements.

>Why is it important to get an 8 bit counter in one package, as 
>opposed to tying two 4-bit counters together ? 

I already have a prototype made of 4 independant 16 bit counters, and
working with 4 bit counters (74F161) are a pain.

What I really would like is 4 addressable independant 16 bit counters 
running off a single clock (no load register needed) with a common
clear but with individual 'counter-freeze' lines.  There would be an
internal latch to hold each counters value (when the freeze line was
activated) and a single tri-state buffer for the output.

I'll put that on my Chistmas wish list...
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: Re: Impedance Analysis on transformers
Date: 14 Aug 92 14:31:18 GMT
Reply-To: michael@vk2bea.UUCP (Michael G. Katzmann)
Organization: Broadcast Sports Technology, Crofton. Maryland.

In article <1992Aug12.062518.819@smsc.sony.com> amir@smsc.sony.com writes:
>
 >I have just started designing a DC-to-DC converter and plan on
 >using the Cadence/Valid simulation tools (Analog Workbench & Spice).  In
 >order to model the transformer correctly, I was planning on getting an
 >impedence analyzer to measure the coupling/stray capacitances in addition to
 >exact measurement of the Inductance.
 >

You can use a Q meter to measure the Co of an inductor so I suppose
you can do the same for a transformer. You look at the capacitance
needed to achieve resonance at two frequencies then use some maths
to figure out the extra C.  You can also measure leakage inductance
and parralel inducatance of a transformer.

H.P. sell one that goes to 70 MHz or so. They can be had for about $4K
on the commercial surplus market. The Marconi TF1275 is better but
is older and may be more difficult to find.



-- 
Michael Katzmann	  >	Broadcast Sports Technology Inc.
~~~~~~~~~~~~~~~~	 <	Crofton, Maryland. U.S.A
Amateur Radio Stations:   >
NV3Z / VK2BEA / G4NYV	 <	opel!vk2bea!michael@uunet.uu.net
Newsgroups: sci.electronics
From: jwp@panix.com (JongWoo Park)
Subject: Where can I get this power supply module?
Date: Tue, 18 Aug 1992 04:05:45 GMT
Organization: PANIX Public Access Unix, NYC

My VCR broke down a while ago, and I finally located the problem 
to the power supply.  The module has part number AP23.
The broken VCR was Samsung model V7800.
Where can I get this power module? ( How much $? )

Specific address would be helpful since I am not in the business
of fixing VCRs.
Thanks in advance.
-----
Jongwoo Park                                          jwp@panix.com
From: mycal@netronix.com (Mycal Johnson)
Newsgroups: sci.electronics
Subject: broken CD player fixable? 
Distribution: world
Date: Wed, 12 Aug 92 17:11:04 GMT
Organization: Netronix, Inc.


In article <713577764.7558.0@helios.mercury.acs.cmu.edu> kz08+@andrew.cmu.edu writes:
  > 
  > I have a TEAC CD player (component, not portable) that has this problem:
  > you have to push twice on the "close" or "play" button in order for the
  > door to shut; after it closes there is a brief whir (the CD does not
  > spin--I've checked) and then the player spits the CD out again.
  > 
  > My question: does this sound like a mechanical or a logic problem? Seems
  > to me something is wrong with the logic circuitry--it is confused and
  > doesn't realize that there is a disk  in the player when in fact there is.
  > If the problem is mechanical, there is some chance that I might be able
  > to fix the player, but if the problem is any more sophisticated, I might
  > as well just throw the player out and buy another one.
  > 
  > Thanks for any info you can give.
  > 
  > Ken

I had what sounds like the same problem in my Sony CD about a year ago.
The mechanism was binding for lack of lubercation.  So I added some teflon
spray and streched the spring a bit ( for more pull ) and every thing
has been working great since.

hope that helps

mycal

------------------------------------------------------------------------------
Mycal Johnson                          _
mycal@netronix.com                    | |_ _ _         There is only one
(707)769-3309                         | | | | |__          nor-cal
-----------------                     |        ___\         so-cal
   -  -  -  -                          \      /              mycal
     Ban all Bans                       |    |
From: siim@waterloo.hp.com (Brad Siim)
Newsgroups: sci.electronics
Subject: Re: Databooks for Intel 80960CA
Date: 21 Aug 92 21:00:51 GMT
Article-I.D.: waterloo.BtCqDG.303
Distribution: usa
Organization: HP Panacom Div Waterloo ON Canada
X-Newsreader: Tin 1.1scd1 PL5


Yes there are a least two versions of 960CA databooks(no timing info given).

80960CA USER's Manual 1989  ISBN 1-55512-099-7
i960CA Microprocessor Users Manual 1992    order number 270710-002 

There is also datasheets published in intel's 16/32 bit embedded controller
databooks.  The name of the data book seems to change every year so I can't 
give you an exact name.(timing info can be found here)

There is a higher performance addition to the family called 960CF. It is pin
and source code compatible with the CF. BIGGER CACHES and a DMA controller
that works.  Try to get the extra features (Errata) for the processor and 
the data sheets if you actually intend to build hardware.
(There are lots of little gotcha's). This applies to both CA & CF versions.

GNU provides an excellent compiler for the 960. Intel also has a GNU version
which can run on either a PC/UNIX environment. 

I have been using this processor for over a year.  It is very nice to work
with from both a H/w and software point of view.  It has a very complicated 
set of reset tables due to it's flexibility.

Brad Siim 519 883-3043
Newsgroups: sci.electronics
From: jeremiahw@wl.aecl.ca
Subject: RE: How hot can the 486-50 cpu run ?
Organization: AECL RESEARCH
Date: Tue, 18 Aug 1992 15:10:23 GMT

>At 400 deg Celcius the chip won't work very good - if it work at all.
>It depend a bit of how long time the chip is at this high temperature.
>I may work at 400 for a very short time, but not for any long time.
>If the right program exist - it won't run very long. When the
>temperature in the chip get too high, the electrical function of the
>chip begin to degrade until the temperature is down to normal again.

>dahls@fhydra.dnet.unit.no

Sorry for the confusion.  What I meant was that this program was designed to
turn on as many transistors as possible thereby creating an *instantaneous*
temperature of 400 deg C.  Obviously this was the only useful output of this
program and so there would be know reason to keep a prolonged temperature.
Besides, it would probably destroy the chip if it were there for any
significant length of time.

Jerry
Newsgroups: sci.electronics
From: elmar@dutentb.et.tudelft.nl (Elmar van Ginneken)
Subject: CMOS Oscillator
Organization: Delft University of Technology, Dept. of Electrical Engineering
Date: Tue, 18 Aug 1992 14:00:51 GMT

Dear NETters,

does anyone out there have any ideas about a simple CMOS oscillator
design?
What I am looking for is a low power oscillator (<.5 mA @ 5V) running
at a frequency of roughly 1 MHz.
However, the frequency-determining component should be an inductor with
a value of approx. 75 uH. (YES, I'm trying to measure inductance-change..)
Long-term stability is not an issue here: the frequency may vary by
max. some Hz per second.
Looking at the power requirements, I was thinkin' about using a CMOS
schmitt-trigger inverter port, but that is not essential.
Any suggestions?

Greetinx,                          o/
          Elmar van Ginneken      <|
                                  /> 

 


Newsgroups: sci.electronics
From: vnelson@ccu.umanitoba.ca (Gerald Vernon Nelson)
Subject: EIA 232 Cable Distances
Organization: University of Manitoba, Winnipeg, Manitoba, Canada
Date: Tue, 18 Aug 1992 04:21:04 GMT


In jjhayes@nbrwh75.bnr.ca (Jeff Hayes) writes:

>well i can only tell you about empirical eveidence.  I ran a multi-user
>RSX11m DEC system years ago in a noisy shop floor env and had 3 VT100s
>about 150' away from the Mini-box and never a breath of a problem.
>So you can push the specs!  but listen for other comments too.

I used to work for the Computer Services Dept. at the University of Manitoba.
We ran a lot of 9600 baud ASCII around campus using twisted pair and 
4 conductor wire.

I can't remember exact numbers, but distances were well over 1000 ft.
One 100 pair cable ran from the 6th floor of the Engineering building,
down to the basement, through tunnels to another building,
and up to the 5th floor of that building.

Cable between buildings is presently being replaced with fibre optics.
As stated, the RS232 standard is severe overkill.  Lengths of several 
hundred feet are reliable using twisted pair cable.

Vern Nelson
From: u9dmlb@ohm.york.ac.uk (Duncan McL Barclay)
Newsgroups: sci.electronics
Subject: Re: Solder melting point (was Re: How hot can the 486-50 cpu run ?)
Date: 23 Aug 92 12:32:56 GMT
Organization: Electronics Department, University of York, UK

One point people have seemed to miss is that if the case and leads get very
hot (ie hot enough to melt solder) then it is likely that the silicon has
got hotter than this, say at a cae temp of 200C a junction temp of 250C.
Now as every engineer who uses transisitors, regulators etc (I know these things
may be alien to you digital boys :-) ) you reckon that your device will stop
working at a junction temp of 150C or a little more. So if you are
melting solder with your ics than they arent doing what they ought to...


Raggy

-- 
Raggy                 | God smiles upon the little children, the alcoholics, and
u9dmlb@ohm.york.ac.uk | the permanantly stoned. S.King.
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Thu, 13 Aug 1992 20:21:14 GMT
Subject: Re: Re: GPS Availability
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> GPS.....That's on UTC, isn't it?
> 
>         Honestly, I've had my license for about 2 years...and every single
> time I've heard the GPS thing, they have always said it wasn't operational,
> etc....I don't think I've ever heard an actual report for GPS....Oh
> welll....
>         That probably wasn't much help, but.......

GPS is most definitely operational, and GPS receivers are now readily
available, albeit with less accuracy than their military cousins.  (The
Feds require this to be so, so that some turkey like Sodamn Insane can't
use our own positioning system to aim his Scuds to the nearest millimeter!)
One of the biggest uses right now is in aviation - check with some private
pilots in your area and see if they'll show you some of the latest avionics
catalogs.


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.
Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)
Subject: Why are 8 bit TTL binary counters so hard to find??? 
Distribution: world
Organization: null
Date: Sat, 15 Aug 1992 00:16:25 +0000

>pressettable counter.  Yes, I know this would need >20 pins, but that's OK --
>there are already 22 pin .3" parts out there!
>
24 pins to be precise, try 74F269  8-)

If they are still available and if the price is ok.

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
                                
Newsgroups: sci.electronics
From: dwight@meaddata.com (Dwight Huddleston)
Subject: Where can I buy this IC
Organization: Mead Data Central, Dayton OH
Date: Wed, 12 Aug 1992 16:56:43 GMT
Distribution: usa


     I've been told by a TV repairman that my 13" color tv needs a new
power relay controller chip. The chip is a NEC UPC1394C and he says it'll
cost about $75! I find that hard to believe so I'm turning to the net for
help. Anybody know anything about this chip? Is it really a power relay 
controller? Where can I get a new one? Where can I get the specs on this
chip just to satisfy my own curiosities? How much should I expect to pay for
this chip? Thanks in advance for any help that anyone can offer!

-- 
Dwight Huddleston             Opinions expressed within      Mead Data Central 
                                 are my own and not        Systems Development
Internet: dwight@meaddata.com   necessarily those of              P.O. Box 933
UCP: uunet!meaddata!dwight       Mead Data Central.         Dayton, Ohio 45401
From: c23jld@kocrsv01.delcoelect.com (Jeff Day)
Newsgroups: sci.electronics
Subject: Re: Another FM stereo transmitter kit
Date: 19 Aug 92 14:43:07 GMT
Distribution: na
Organization: Delco Electronics Corp.
Originator: c23jld@koptsw15


Could someone email me the maximum range of the Ramsey FM-10
and the FM transmitter kit from D. C. Kits.

What is the maximum allowed by the FCC?

Thanks,

Jeff Day
 	c23jld@kocrsv01.delcoelect.com
-- 
Jeff Day                               Domain: c23jld@kocrsv01.delcoelect.com
Powertrain Electronics Software Engr.  UUCP:   deas!c23jld
Delco Electronics Corporation         
Phone: (317) 451-0448  GM: 8-322-0448  
Newsgroups: sci.electronics
From: rbhardin@undergrad.math.waterloo.edu (Ron Harding)
Subject: Wanted: PADS-Logic and PADS-PCB software
Organization: University of Waterloo
Distribution: ont
Date: Thu, 13 Aug 1992 18:42:11 GMT

I'm interested in obtaining PADS-Logic and PADS-PCB, but I can't afford the
US$2000 to get them new.  So, I'm looking for used copies.

If you have them, and don't mind parting with them, let me know.

If you don't have them, and want them, let me know.  Maybe we can work
out a volume discount from PADS.

=============================================================================
From a local computer call-in show:	|  Ron Harding
Q: I hear all this talk about base      |  rbharding@descartes.waterloo.edu
   memory, expanded memory, and         +------------------------------------
   extended memory.  What is the difference, and why don't I have them on
   my Amiga?
A: Well, the Amiga doesn't offer that kind of flexibility...
=============================================================================
From: lance@helios.ucsc.edu (Lance Bresee)
Newsgroups: sci.electronics
Subject: INFO Requested on ULTRASONIC bug shooers...
Keywords: Microcontroller help info
Date: 13 Aug 92 15:37:34 GMT
Distribution: usa
Organization: UCO/Lick Observatory
NNTP-Posting-Host: helios.ucsc.edu


I have seen several different ultrasonic mosquito, mouse,
and cockroach control devices.  I am interested in 
incorporating some ultrasonic bug protection into my
computer-controlled-drip-irrigation-solar-powered-greenhouse
project.

ANYONE know HOW these work..HOW WELL these work..WHAT the
range is... in short ANY INFORMATION AT ALL.

Thanks muchly
lance


PS
thanks to the lone reply from my last post who answered
the second question and provided a source for OKI manuals.
Newsgroups: sci.electronics
From: ren@virga.rap.ucar.edu (Ren Tescher)
Subject: Re: Re: RGB LEDS
Reply-To: ren@virga.rap.ucar.edu (Ren Tescher)
Organization: Research Applications Program/NCAR, Boulder, CO
Distribution: co
Date: Sat, 15 Aug 1992 21:43:17 GMT


To: myers@hpfcso.fc.hp.com
Subject: Re: Re: RGB leds - they're need but who makes them
Newsgroups: sci.electronics
Organization: Research Applications Program/NCAR, Boulder, CO
Cc: 

Uh,,,Bob?  I think you got the Red and Green mixed up.
Y=.59R+.3G+.11B
The Red gun gets driven the hardest and burns out sooner
(see the green tv thread still in progress).
ren n0pvi
dona nobis pacem

p.s.my direct-mail to you went boing-boing!
p.s.2.this ain't the first time that's happened.
Newsgroups: sci.electronics
From: scholl@gaul.csd.uwo.ca (Cam Scholl)
Subject: Pay-TV
Organization: University of Western Ontario
Date: Sat, 22 Aug 1992 00:18:40 GMT

I want to build myself a pay-tv descrambler.  (Just to see if I can!)

The channels around here are scrambled with both a negative image and
a messy picture.

Any Ideas?

Cam.
Internet: scholl@gaul.csd.uwo.ca



Newsgroups: sci.electronics