HDTenEightyP/NetNews huggingface dataset:
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Magnetic Sensor?, hall effect, reed switches, etc
Date: 7 Jan 1993 07:35:33 GMT
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <103678@netnews.upenn.edu> george@mech.seas.upenn.edu writes:
>
>:Good magnetic sensors in disk drives , brushless DC motors or Car 
>:ignitions use Hall Effect sensors that provide a solid state or linear 

>my latest project needs a magnetic sensor to operate over a range 
>from 0 to 100Hz.  I think this is at best pushing the limit
>of what i can do with a reed switch.  How can i find out
>out more about hall effect devices?  A small quantity supplier,
>with data sheets would be nice..

	Newark Electronics, and Active Electronics, both stock
the Allegro line (formerly Sprague) of Hall sensors.  Some
are conditioned on-chip, some are conditioned and have a Schmitt
trigger (digital output only), and some are 'raw'.  Contact
the nearest Allegro office or representative (I have a phone
number (215) 467-5252, which should work for U.Penn.) for the
appropriate device data, and buy a few chips and try 'em out.

	John Whitmore
Newsgroups: sci.electronics
From: bill@thd.tv.tek.com (William K. McFadden)
Subject: Re: Ancient Scope Info Required! (Tektronix Type 564)
Organization: Tektronix TV Products
Date: Tue, 5 Jan 1993 23:24:24 GMT

My e-mail reply bounced, but this info should be of general interest.

Date:    16 Apr 92 03:37:52 GMT
From:    keithl@loop.uucp (Keith Lofstrom;;;520-1993)
Subject: Where to find old Tektronix manuals
Newsgroups: sci.electronics
Organization: KLIC

For all you folks looking for Tektronix oscilloscope manuals, old CRTs,
etc., there is a retired Tek engineer who has quite a stock of old Tek
manuals and such:

Deane Kidd
27270 Ladd Hill Road
Sherwood, Oregon 97140
(503) 625-7363

Deane worked at Tek for 40 years, and was the guy in charge of telling 
the rest of us we hadn't done it right yet.  He is taking care of the old
stuff because he thinks that is part of doing it right  (you can decide for
yourself what current Tek corporate policy is).  He is probably as much to
thank as anyone for the old - but still usable - Tek equipment that you 
folks are trying to scrounge parts and manuals for.  If not for him, the
stuff would have fallen apart a long time ago.

Deane sells this old stuff as a labor of love, and he isn't getting rich
doing it.  If you think his prices are too high, or that he doesn't act
like a "real businessman", you don't have to do business with him.  If
you are a connoisseur of classic instrumentation, be glad to have an 
opportunity to deal with one of the men that made it happen.

Keith
-- 
Keith Lofstrom       keithl@loop.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


-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
bill@tv.tv.tek.com, ...!tektronix!tv.tv.tek.com!bill      Phone: (503) 627-6920
How can I prove I am not crazy to people who are?
Newsgroups: sci.electronics
From: markb@tplrd.tpl.oz.au (Mark Bower)
Subject: Re: New (to me) laser-beam pickup application
Organization: Telectronics Pacing Systems
Date: Mon, 4 Jan 1993 22:19:22 GMT

In article <72811@cup.portal.com> Chris_F_Chiesa@cup.portal.com writes:
>By now we all (hopefully) know that lasers are used to read signals from
>CDs and videodiscs, but last weekend while visiting friends over Christmas
>I heard of a new application for the same (or similar) technology: reading
>good ol' vinyl records by contactless laser pickup.  Has anyone here heard
>of this, and can anyone provide any details on HOW it is being done?  This
>is one of those ideas that, to me, seems obvious in retrospect, and "it's
>a wonder nobody thought of it sooner."

I remember reading something about this in either Popular Science  or
Popular Mechanics during either 1986 or 1987. As far as I know, the
project eventually died due to the lack of funding and the
popularity of CD's which became much more prevalent while the
laser reading record player was trying to get attention.

Cheers,
Mark
-- 
<\\\        If swallowed, crawl out through the tear-ducts.        <'\
 >>>>===============================================================>->
<///markb@tps.com  "Above all, be Cool" -PTV  markb@tplrd.tpl.oz.au<,/
Newsgroups: sci.electronics
From: graham@venus.iucf.indiana.edu (JIM GRAHAM)
Subject: Voice modification...how?
News-Software: VAX/VMS VNEWS 1.3-4   
Reply-To: graham@venus.iucf.indiana.edu
Organization: Indiana University Cyclotron Facility, Bloomington, Indiana
Distribution:  world
Date: Sat, 9 Jan 1993 19:34:44 GMT

For some time, I've wanted to build a small "box" that, when spoken into,
reproduces my voice as that of a Cylon Raider from the old Battlestar
Galactica series.

My problem is a simple one.

Is the voice actual voice simply "modulated", or is tone mixed with the
original voice and then modulated?

Thanks for any info,

Jim Graham 

        -> ->Disclaimer: I do not speak for my company. <- <-
                          Neither do they speak for me.
 ______________________________________________________________________
| Internet: graham@venus.iucf.indiana.edu                              |
|           dolmen!jgraham@moose.cs.indiana.edu                        |
| BBS:      The PORTAL DOLMEN BBS/ParaNet ALPHA-GAMMA (sm) (9:1012/13) |
|            (812) 334-0418, 24hrs.                                    |
|______________________________________________________________________|
From: cmh@eng.cam.ac.uk (C.M. Hicks)
Newsgroups: sci.electronics
Subject: Re: Good way to prototype analog circuits?
Date: 4 Jan 93 20:56:31 GMT
Organization: cam.eng

kurdzo@gdc.com (Jim Kurdzo) writes:

>John Paul Morrison (jmorriso@ee.ubc.ca) wrote:
>> 
>> Does anyone want to share their tips on prototyping analog circuits?
>> Specifically: sensitive, high gain circuits; RF circuits etc.
>> 
>> These kind of circuits work well with PC boards with ground planes,
>> but are there any simple, easy to make changes, techniques for this?
>> Are there any pre-made boards with a ground plane, and holes with solder
>> contacts on them?
>> 

>I always use the pre-punched vector board with copper clad on one side.
>Vector p/n  169P84WEC1 is  8.5" x 17" and available from Digi-Key for around
>$20.  Just cut it up into smaller pieces with tin snips.  Wherever you
>DON'T want a ground connection, ream out the ground plane with a 1/4" drill
>bit.

I have come across this stuff, but with clearance round the holes on the 
ground-plane side so you don't have to remove copper from individual holes.
Unfortunately I have no idea where to get it, since the few bits I have were
salvaged from a skip and have no markings. It is excellent for building
one-off audio circuits.

For high RF (eg 100MHz and up) a good method is to use single-sided board,
copper side up, as a ground plane, and stick components to it with 
cyano-acrylate glue. Connections are then made in mid-air, using their own
stiffness as the only support. This works *really well* despite sounding
ludicrous, but is only suitable for developmental work.

Christopher Hicks

--
 ==============================================================================
 Christopher Hicks    |    If it doesn't fit...
 cmh@uk.ac.cam.eng    |                        ...you need a bigger hammer.
 ==============================================================================
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: RS 232 & RS-422 voltage specs wanted
Date: Thu, 7 Jan 1993 17:27:59 GMT
Organization: U of Toronto Zoology

In article <1993Jan7.160410.28308@newton.ccs.tuns.ca> maceacla@newton.ccs.tuns.ca (Leonard Alexander Maceachern) writes:
>Where can one access specifications for the RS232 standard?

I'm sure EIA will sell them to you, for some outlandish price.  Like
most "traditional" standards, they're not available online.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Vector wire pencils
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 6 Jan 93 06:55:09 GMT

Doug Collinge - VE7GNU (doug@ve7frg.ampr.org) wrote:
: James MacPhail (jmacphai@cue.bc.ca) wrote:
: : You guys are aware of ScotchFlex, right? If not, check it out. It is made
: : by 3M (and thus tends to be considered over-priced by some).
: 
: Yes, it *IS* overpriced.
: 
: But, you know, I've done about 3 or 4 circuits with Scotchflex,
: and EVERY TIME I have gone through the same thing:
: 
: BEFORE: "This stuff is so expensive - maybe I should use wirewrap
: 	 this time."
: 
: AFTER:	"This stuff is so great - I'll never use wirewrap again!"
: 
: It truly is wonderful, for digital circuits anyway.  For analog
: use Dead Bug (tm).
: 
: Cheers!



Robinson-Nugent has made a similar product for years - and I bet it's a lot
cheaper than 3M.  About the only really high-priced item for this wiring
system is the Teflon-coated wire.  Check-out Viking Distributors in Minnesota
for more info.  And, even if it is a little more expensive than regular wire-
wrapping the headaches that it prevents are worth it.


Jerry


"It riles them to believe that you perceive the web they weave and keep on thinking free!"
  !
Newsgroups: sci.electronics,misc.legal
From: cjp@megatek.com (Chris "Systems Stud" Pikus)
Subject: Re: Recommend a book on "Patenting Your Invention"?
Organization: Megatek Corporation, San Diego, California
Date: Tue, 12 Jan 1993 21:55:37 GMT

pmw2c@csissun10.ee.Virginia.EDU (Paul Michael Wayner) writes:
> 
> One thing that I would suggest is that you may want to consult
> a patent attorney about writing the claims for your patent
> application.  If the claims are written improperly you will 
> either get rejected in your application, or you will end up
> with a patent that is worthless.  I used to be a patent examiner
> and most of the people who filed there own applications tended
> to have poorly written claims.
> 
> 						Paul Wayner

	Paul is correct. Claims drafting is where the art/skill/science is at
in a patent application.  What you are paying a Patent Agent/Attorney for is
not just to file paperwork, but to correctly draft the patent.

	If the claims are too broad, the patent may not hold up to later chal-
lenge; infringers may claim that your patent was "obvious" and/or "not patent-
able in the first place".  If they are too narrow, the entire "invention" may
not be protected. (i.e. Someone else can make something similar to your
invention but does not infringe upon your claims.)

	If you think it is worth money, spend the money to get it done right.

	P.S. Someone mentioned that trade secret protection may be a better
way to go. The problem is that if the secret gets out, then you have no pro-
tection left. With a patent, even if someone "re-invents" it, you still have
rights to it.

-- 
Christopher J. Pikus,        | "Forgive me for not knowing about El Salvador. 
Megatek Corp., San Diego, CA | Like it's not like I'm ever going to go to Spain
INTERNET: cjp@megatek.com    | or anything."	  -- "Buffy the Vampire Slayer"
Newsgroups: sci.electronics
From: mikek@neptune.iex.com (Mike Keilhofer)
Subject: PCB and Silk Screen info
Originator: mikek@neptune.iex.com
Organization: iex
Distribution: tx
Date: Mon, 4 Jan 1993 15:18:22 GMT



I'm looking for information on 2 subjects:

1) Where in Tx (I'm in North Dallas) can I get printed circuit boards
   etched. I would also like to find a company that has PC software
   that allows me to provide them with a layout.

2) Where can I get a silk screen made for rach mount face plate.

All this is for the purpose of making a prototype into a professional
looking sellable 'rack mountable cabinet' audio processor. 

Thanks for any info
Newsgroups: sci.electronics
From: jmorriso@ee.ubc.ca (John Paul Morrison)
Subject: Re: Phased sonar
Organization: University of BC, Electrical Engineering
Date: Mon, 11 Jan 1993 02:51:37 GMT

In article <1993Jan10.104636.5690@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
>
>Hi,
>
>	I've been told, by those who ought to know, that you can take 3 or
>more sonar transponders, send out a pulse, and then watch what happens to
>all three of them on the return trip to get an entire effective 360 deg.
>sweep of whatever you're looking at.  Supposedly almost as good as having
>one rotating transponder, but no more need to rotate -- neat.

'supposedly almost as good' ... grumble...
>
>	So... could someone give me a reference to where I could read all
>the details about how this is done?  Or, if it ought to be glaringly
>obvious and simple, explain how it's done?

I would imagine that a phased sonar works on the same basic principles
as a phased array radar. (just using different kinds of waves)

The 3 transponders are like 3 antennas. Send pulses into the transponders
with different phase angles, and the outputs add and substract in nifty
patterns. The outputs interfere, cancelling out, or add, making the output
focused in a certain direction.

WIth nifty control electronics, who needs a spinning transponder/antenna.
>
>	Thanks.
>
>						---Joel Kolstad


-- 
__________________________________________________________________________
 John Paul Morrison                     |  
 University of British Columbia, Canada |  
 Electrical Engineering                 |   .sig file without a cause
 jmorriso@ee.ubc.ca              VE7JPM |  
________________________________________|_________________________________
From: dfm@norman.VI.RI.CMU.EDU (Dave McDonough)
Newsgroups: sci.electronics
Subject: WATER DAMAGE TO COMPUTER EQUIPMENT
Date: 12 Jan 93 22:44:23 GMT
Article-I.D.: cs.C0rJ60.LIn.2
Reply-To: jml@visus.com
Organization: School of Computer Science, Carnegie Mellon

I need to find published references to the damaging effects of rain water  
and/or high humidity on computer equipment.  Anything about controlled studies,  
case histories, insurance settlements, etc. is welcome.  I have plenty of  
hearsay anecdotes already, thanks.
Newsgroups: sci.electronics
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: PLease help - video playing up !
Date: 11 Jan 93 07:51:15 GMT
Reply-To: paula@nlbbs.uucp
Organization: The Electronics Workbench - Cumberland Maine


In article <1993Jan7.170200.9492@nessie.mcc.ac.uk> sl@nessie.mcc.ac.uk writes:

 > 
 > 
 > Video will not review (ie rewind whilst seeing what's on the screen) it just
 > freeze frames then stops after about 4 seconds. I guess that the end of tape 
 > detector cuts in as the tape is not working.


        Well, it could be as simple as replacing the idler wheel and the
        belts.  Or, it could be as awful as a bad bearing on the drum
        assembly or a faulty capstan or drum driver.

        With no power applied, the heads should turn smooth as silk. If
        the rubber parts have never been replaced, that would probably
        be a real good place to start.

        What brand and model?
Newsgroups: sci.electronics
From: bert@popfly.NSP-SERVER1 (Joe Castellano)
Subject: DC vs AC Halogen Lamp Bulbs 	
Keywords: Halagon
Reply-To: bert@popfly.NSP-SERVER1
Organization: Tandem Computers Inc.
Distribution: usa
Date: Fri, 8 Jan 1993 21:50:33 GMT

What is the difference between Halagon lamp bulbs that require 110v/220 ac compared
to those that run on 12v DC. Do they both emit the same color light ??
How about their efficiency ??

Thanks in advance;

Joe
From: PVossler@cen.ex.ac.uk (P.J.Vossler)
Newsgroups: sci.electronics
Subject: Spice simulation for windows3.1 available
Date: 8 Jan 93 13:52:49 GMT
Distribution: sci
Organization: Computer Unit. - University of Exeter. UK

Read the following in comp.lsi and as it seemed relevent ....

===============================================================================

 I've uploaded Spice32 for Windows NT & Windows 3.1.  I've included the
 Setup and necessary files to install Win32s so that NT binaries, such
 as this version of spice, will run on your Windows 3.1 system.

 Win32s is Microsoft's DLL which allows WindowsNT binarys to run, unmodified,
 on WIndows 3.1 systems.

 Win32s is still in beta, so ypu'll want to get a fresh copy when it's
 released.

 Spice32 my port of Berkeley's Spice, version 3e2, which is a powerfull
 circuit simulator.

>>

Sorry, I forgot:
 You can get it at:
 ftp.cica.indiana.edu, /pub/pc/win3/uploads/spice4.zip

-robert
--
	

===============================================================================
P.J.Vossler, Dept of Physics,	|	Email:p.j.vossler@ex.ac.uk 
University of Exeter		|	Tel  : +44-392-264100
Exeter, Devon, England EX4 4QL  | 	Fax  : +44-392-264111
===============================================================================
-- 
	

===============================================================================
P.J.Vossler, Dept of Physics,	|	Email:p.j.vossler@ex.ac.uk 
Newsgroups: sci.electronics
From: pmw2c@csissun10.ee.Virginia.EDU (Paul Michael Wayner)
Subject: Detecting Sine Wave freq
Reply-To: pmw2c@csissun10.ee.Virginia.EDU (Paul Michael Wayner)
Organization: University of Virginia
Date: Sat, 9 Jan 1993 21:42:41 GMT


I'm interested in designing a circuit that will determine
if a sine wave frequency is in a certain range of values,
specifically, 45-51 MHz.  It is very important that the
detector be as reliable a possible, so I would like to use
only a few active components and try to stick to RC's as
much a possible.

Any suggestions would be welcome.

					Paul Wayner
Newsgroups: sci.electronics,sci.energy,rec.autos
From: rubin@kingkong.cis.ohio-state.edu (Daniel Rubin)
Subject: Re: Flywheel batteries as EV power source
Organization: The Ohio State University Dept. of Computer and Info. Science
Date: Mon, 11 Jan 1993 15:10:58 GMT

>>It is extremly difficult and blasting caps will not do it.  You
>>may be thinking of nitrocellulose or "gun powder" it can be made to detonate,
>>but again that is extremely difficult.
>
>I think you mean "gun cotton."
>
>jim frost
>jimf@centerline.com

Yes you are correct.  Also smokeless powder contains some nitrocellulose,
but yes I was thinking about one thing and typing another.  Accurate 
information is important on such topics...

thanks                                                       - Dan

-- 

             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!
From: csw3503@u.cc.utah.edu (Charles Wen)
Subject: HELP WANTED: How to add a video output socket to a TV?
Organization: University of Utah Computer Center Student Mail Machine
Date: Mon, 11 Jan 93 23:16:00 GMT


I've a difficult problem to solve, and any help is appreciated.

There's a Sony TV set (Model: KV-20TS27) which doesn't have a video output
socket.  What I need to do is to add a video output socket that can be
connected to any other TV/VCR's video input socket.  Can anyone tell me
where I should start and how to do it? (magazines, repair manuals (where to
get them?), or ......)

Please reply by e-mail to: csw3503@u.cc.utah.edu (if it's not already in the
header)

Thanks! -- Charles


--
(Below you see the Emperor's new signature. :)
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Phased sonar
Date: 10 Jan 93 16:46:35 GMT
Organization: U of Wisconsin-Madison College of Engineering


Hi,

	I've been told, by those who ought to know, that you can take 3 or
more sonar transponders, send out a pulse, and then watch what happens to
all three of them on the return trip to get an entire effective 360 deg.
sweep of whatever you're looking at.  Supposedly almost as good as having
one rotating transponder, but no more need to rotate -- neat.

	So... could someone give me a reference to where I could read all
the details about how this is done?  Or, if it ought to be glaringly
obvious and simple, explain how it's done?

	Thanks.

						---Joel Kolstad
Newsgroups: sci.electronics,sci.engr
From: schriste@uceng.uc.edu (Steven Christensen)
Subject: Re: Book club for EE
Organization: University of Cincinnati
Date: Tue, 12 Jan 1993 13:12:40 GMT

In article <darknite.726819812@camelot> darknite@camelot.bradley.edu (John S. Novak III) writes:
>
>As a near-graduation EE, I have a vested interest in building up
>a small library fairly quickly.
>
>Can someone please recommend a good book club for electrical
>engineers?  What I'm looking for is a club with reasonable
>prices, with an opening deal which doesn't try to gut my
>pocketbook with a "You must buy 5 books in twelve months" clause.


I'll tell you one to avoid - the McGraw-Hill book club. They seem
to recycle the same books, most of which are so specific to make
them unusable but to a tiny population of engineers, or so general
to make them equally unusable.

Their 3 books in 2 years policy (I think) was a little oppressive.

	Steven

>--
>"Don't worry, if I am teaching in a mathematics course, and they don't know
> how to derive that formula, I flunk them.  Don't worry, I'm teaching in an EE
> course, so if you don't know how to derive it, I just kill you."
>          -Dr. Santiago Navaro, 02-07-92
>John S. Novak, III		darknite@camelot.bradley.edu


-- 
Steven V. Christensen
schriste@uceng.uc.edu
From: walsh@optilink.COM (Mark Walsh)
Newsgroups: sci.electronics
Subject: Re: Where to mount an outside temp probe on a car?
Date: 6 Jan 93 02:29:35 GMT
Organization: Optilink Corporation, Petaluma, CA

From article <1993Jan4.223650.9171@phx.mcd.mot.com>, by schuch@phx.mcd.mot.com (John Schuch):

> Excuse me but if you cool the sensor by placing it in an airstream, your
> not reading the actual temperature of the air.

At supersonic velocities, this is indeed the case, as friction
will have an effect e.g. surface heating of meteors, rockets, etc.
At less drastic temperatures, airflow will cause the temperatures
to equalize.

> Reading a sensor cooled
> by an airstream, by itself, tells you nothing. If you measure one sensor
> in an airstream and another one nearby but shielded from the air stream,
> you can determine the speed of the airstream.

Not without knowing the atmospheric pressure, the pressure right
at the sensing element, the relative humidity, and some higher math.

> Other than that, I don't
> know why you would want to cool the sensor.

I think that the original poster wanted it to merely reflect
the outside air temperature, and did not want to cool it in
any way.

> You will note that weather stations keep the thermometer in a little
> louvered box to break-up the wind. Even high-end indoor/outdoor
> thermometers include a little shell to place over the external
> sensor.

The purpose of the box is to keep the sun from shining on the element,
which would heat it up and introduce error into the measurement.
The purpose of the louvers is so that some convection can occur, thus
prohibiting the air inside the box from heating up.
-- 
Mark Walsh (walsh@optilink) -- UUCP: uunet!optilink!walsh
AOL: BigCookie -- Amateur Radio: KM6XU@WX3K -- USCF: L10861
"What, me worry?" - William M. Gaines, 1922-1992
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: Re: Where to mount an outside temp probe on a car?
Date: 4 Jan 93 21:47:35 GMT
Organization: University of Pennsylvania, Mechanical Engineering


:
:Having done this very thing on a Radio-Shack sort of level, I would recommend
:mounting the sensor at the very front of the car, as far in front of the bumper

i recall one GM system ( high end, either corvette or caddilac ) which
supposedly got the external temperature fouled up because the sensor
picked up the exhaust from the car in front of you.
I found it hard to believe...but if your thermometer reads 200F maybe
you should put the sensor someplace else :-)


--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
From: John.Seboldt@f31.n282.z1.tdkt.kksys.com (John Seboldt)
Sender: FredGate@tdkt.kksys.com