HDTenEightyP/NetNews huggingface dataset:
From: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
Subject: Altitude device
Reply-To: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
Organization: University of Trondheim, NORWAY
Date: Mon, 27 Jul 92 10:38:19 EDT

Hello.

I'm looking for some kind of sensor which I can use to measure the height
and/or changes in the altitude. I want to connect it to a microprocessor
with analog input.

What I like to know is how this devices work. Where do I get them and
what do they cost. Technical information is also needed.

Thanx in advance.

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+
* I went back to my mother,           * Joern Yngve Dahl-Stamnes           *
* I said, "I'm crazy ma, help me!"    * University of Trondheim            *
* She said, "I know how it feels son, * The Norwegian Institute of Tech.   *
* 'cause it runs in the family."      * Division of Physical Electronics   *
*       - The Who, Quadrophenia       * e-mail: dahls@fhydra.dnet.unit.no  *
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+
From: gt8021a@prism.gatech.EDU (EASON)
Newsgroups: sci.electronics
Subject: Re: White noise generator.....
Date: 28 Jul 92 18:39:51 GMT
Organization: Georgia Institute of Technology

In article <9981@sun13.scri.fsu.edu> nall@sun8.scri.fsu.edu (John Nall) writes:
>Does anyone know of such a device?  If not, is there a such a noise-
>generator chip available?  (I don't have access to any sort of technical
>material on what chips are available these days).

(Once again supporting the theory someone pointed out a couple weeks ago...)

The cover story (project) in the August Radio Electronics is a surf noise
generator which drives walkman-type headphones.  With a decent op-amp, it
should drive a small speaker instead.

-wte
-- 
Bill Eason         w-404/894-2381        h-404/352-6914
BE-EE/CS May 1987    MS-EE June 1992    PhD-CS ???? 19??
wte@cdrom.gtri.gatech.edu (pref.)  -or-  gt8021a@prism.gatech.edu
Newsgroups: sci.electronics
From: dana@locus.com (Dana H. Myers)
Subject: Re: Help with transtators needed
Organization: Locus Computing Corporation, Los Angeles, California
Date: Wed, 22 Jul 1992 15:16:57 GMT

In article <1992Jul18.143401.12601@usenet.ins.cwru.edu> vxv4@po.CWRU.Edu (Virgilio Velasco) writes:
>
>
>	Help!  I'm trying to build a tricorder for my EE masteral
>thesis, but I couldn't find any transtators anywhere.  Can someone
>help me out?

   I bought a couple of spares when I built my tricorder, but I can't
find them now. I went to International Technology Sources to buy them,
however, ITS no longer carries transtators due to problems with
securing export licenses and the such.

  Probably you'll need to fab your own; this isn't supposed to be
too hard. Take a look at the Star Fleet Technical Reference, Supplement
3A-0005 "Fabrication of Common Transtators In The Field". Fascinating
explanation of the reverse-flux-time process involved. The only risk
is that a minor error at one particular step can result in a massive
"bump" in the space-time fabric, but I didn't have any problems with
this at all. If you've successfully built a dilithium power generating
unit before (and who hasn't?), you'll have no trouble whatsoever.

Good Luck!


-- 
 * Dana H. Myers KK6JQ 		| Views expressed here are	*
 * (213) 337-5136 		| mine and do not necessarily	*
 * dana@locus.com  DoD #466 	| reflect those of my employer	*
 * "Dammit Bones, spare me the lecture and give me the shot!"   *
Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: Cable, Stereo, and VCR Questions
Keywords: Cable TV Stereo VCR
Organization: San Diego State University
Distribution: usa
Date: Tue, 28 Jul 1992 18:38:35 GMT

In article <1992Jul27.133817.11872@lonex.rl.af.mil> Brian R. O'Hern (BRO'Hern) writes:


> I have three questions:

>1.  I have a lot of RG-58C (50 ohms) and was thinking of using it to 
>connect my Marantz 200W amp to a pair of Klipsh Heresy speakers.
>Are my calculations showing that nearly 86% of the signal would be
>reflected back from the 8 ohm load?  So, not only "no" but "hell no"
>I shouldn't use coax to drive my speakers? 
>  However, my instinctive feelings tell me that at because the line
>is not infinite (transmission line theory), the connection is
>analyzed as a RC circuit showing the characteristic impedence of the
>line is close to the load value so reflection isn't a problem.  Also,
>at 30pF a foot, an audio signal would hardly notice.  In fact, it
>seems connections using coax would be better than a zipcord (~150
>ohms) or even a twisted pair and much less noisy than both?

>1a. Side Ques: I heard that the "Heresy" name came about because its
>design (Conventional paper cone) is not the standard (does not
>follow the Klipsh design doctrine).  Any truth to this?

>2. Is there a FAQ list on VCR problems?  It seems that everyday there
>is at least one question about VCRs... speaking of which...  I have
>a RCA that stops a couple seconds after pushing play no matter where
>you are on the tape. 

>3. I have a couple of coax splitters that I acquired in college from 
>my cable connection.  I would like to use them to split an antenna
>signal (one to TV one to FM stereo).  Is there any truth to the 
>rumor that the splitters filter out high UHF?  I.E. I won't get
>channel 68 (~795MHz) through it.

>Thank you for any comments.


>BRO'HERN
>STD DISCLAIM APPLIES ('disClaim dat I make is no lie...)
>This medium is subject to monitoring. Use of this medium constitutes
>consent to such monitoring.

If the length of your speaker wire was longer than 2.5 kilometer, then 
you can use transmission line theory. 2 E8(signal velocity)/20kHz.=10000 
meter. Rule: if the propagation delay was less than 1/4 of rise time of
the signal (@ max. frequency), then the medium acts as a transmission line.

3- Some cheap splitters do the filtering by means of higher insertion loss
at higher frequencies, but still you can get ch. 68.
Newsgroups: sci.electronics
From: zben@ni.umd.edu (Charles B. Cranston)
Subject: ALFA DVM info
Organization: UM Home for the Terminally Analytical
Date: Wed, 22 Jul 1992 23:33:48 GMT

ALFA Electronics, Princeton NJ, 1-800-526-ALFA

It was a tough choice for me between the DMM-2360 unit
(which I actually purchased) and the DMM-175A unit.
The 175 was cheaper and its frequency counter went to
20 MHz instead of the 4 MHz for the 2360 but I already
have a 1MHz to 1GHz Optronics counter so the higher
frequencies are covered and the 2360 had an inductance
range which the 175 didn't.

DCV:
175  200mv, 2v, 20v, 200v, 1000v
2360 400mv, 4v, 40v, 400v, 1000v

ACV:
175  200mv, 2v, 20v, 200v, 750v
2360 400mv, 4v, 40v, 400v, 750v

DCA:
175  200ua, 2ma, 20ma, 200ma, 10a
2360 400ua, 40ma, 400ma, 10a

ACA:
175  200ua, 2ma, 20ma, 200ma, 10a
2360 400ua, 40ma, 400ma, 10a

OHM:
175  200, 2k, 20k, 200k, 20m, 2000m
2360 400, 4k, 40k, 400k, 4m, 40m

Capacitance:
175  2nf, 20nf, 200nf, 2uf, 20uf
2360 4nf, 40nf, 400nf, 4uf, 40uf

Inductance:
175  n/a
2360 4mh, 40mh, 400mh, 4H, 40H

Frequency
175  2k, 20k, 200k, 2m, 20m
2360 4k, 40k, 400k, 4m

Temperature
175  n/a
2360 302f, 150c

Other features:

175  logic probe detects 25ns pulse
     HFE, diode, and LED tests
     continuity beeper

2360 logic probe detects 25ns pulse
     continuity beeper
     auto power-off battery save

Price (1991-1992 catalog)
175  $ 79.95
2360 $129.95

They also supply a half-dozen other less expensive DMMs, three
stand-alone Capacitance and LCR meters, a range of clamp current
probes, a stand-alone oscillator, several thermometers, a ph
meter, a light meter, several electronic scales, several power
supplies, several oscilloscopes, and a line of function/signal
generators.

At these prices these have to be imports...
From: un040333@wvnvms.wvnet.edu
Newsgroups: sci.electronics
Subject: Ultrasonic Chip
Date: 31 Jul 92 13:00:40 GMT
Organization: West Virginia Network for Educational Telecomputing


	I would like to know if anyone has had some experience with the
National Semiconuctor chip LM1812.  I would like to use it in an ultrasonic
ranging system.

	P.S.  This is my first posted question on a news net, I hope it 
		works O.K.
					Thanks,
					Philip Plourde
					WVU Electrical Engr. Senior
From: steen@wkuvx1.bitnet
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Date: 21 Jul 92 14:58:06 GMT
Organization: Western Kentucky University, Bowling Green, KY

Just another shocker....

My senior year at college I was working in the physics lab attempting to charge
a teflon disk to approx. 1200v.  It just so happens that the teflon disk was
located in a plastic holder.  I was and always am very careful around H.V., in
fact, the supply that I was using had enough current capacity to demand
respect.  To make a long story short, I was holding the plastic holder and I
applied the H.V. probe to the disk.  The probe accidently touched the plastic
holder, no problem right it's plastic. WRONG it was of course conductive
plastic, an introduction that I will never forget; if only I could remember.

Buddy Steen,
W.K.U. Technical Support
From: jcw@kd4dts.dixie.com (John C. Wren)
Newsgroups: sci.electronics
Subject: Re: Caller ID
Date: 23 Jul 92 00:44:00 GMT
Distribution: na
Organization: kd4dts


Ya know, there is a simple solution to all this talk about Caller ID and
protecting your number.  It costs a little bit, but it offers you several
services in the process.

1)  Obtain Caller ID  (optional)

2)  Obtain Ring Master + Ring Master Controller

Set it up like this:

    Your primary number is 555-1111
    Your secondary number is 555-2222
    Your (optional) tertiary number is 555-3333

Connect your answering machine or (explitive deleted) box (a small device
using a voice band DAA, a tape machine or ISD 1216 voice store chip) to the
primary number.  Connect your "nice" answering machine (optional) to the
secondary number.  Make all phone calls from the primary number.  This gives
out the primary number as your number.  Friends calls you on your secondary
number.  People using the primary number (obtained on their end by Caller ID)
get the nasty message.  The tertiary number can be used by children, or if
you expect business calls, or whatever purpose makes you happy.

I'm in the process of building a small microprocessor controller that contains
Caller ID circuitry.  If I get a call from a Caller ID blocked number, you
get dumped to a "I'm sorry.  We don't accept calls from Caller ID blocked
numbers.  Please call again from an unblocked phone.  *Click*" message.  Out
of area calls are handled passively, and get dumped to a answering machine.
Phone numbers are looked up in a database (on a Unix system), and pumped out
to a voice synthisizer that is connected to speakers through-out the house.  If
the hour is appropriate (i.e. not asleep), the name of the person is announced
over the speaker system.  Calls that come in on the primary number are given a
nastygram.  Calls on the secondary number are passed through the aforementioned
hardware.  If we don't answer the phone, then it gets dumped to an answering
machine.  I'd like to add the Ring Master decoder to version 2 of my hardware,
but as it is, it goes through a Lynx Automation device (about $80).  All in
all, combined with a PBX, this gives the most privacy, most flexibility, and
the most time to build and maintain hardware of any of the solutions.
-- 
--------------------------------------------------------------------------------
John C. Wren (kd4dts)			|  Word Prefect 5.0:  The choice of
jcw@kd4dts.dixie.com			|    religious scribes everywhere.
..!emory!rsiatl!kd4dts!jcw		|
From: u9dmlb@ohm.york.ac.uk (Duncan McL Barclay)
Newsgroups: sci.electronics
Subject: Re: Dolby B/C? (A??)
Date: 23 Jul 92 11:31:50 GMT
Organization: Electronics Department, University of York, UK

In <1992Jul22.130639.933@wpi.WPI.EDU> cubanski@tensor4.WPI.EDU (David J Cubanski) writes:

>Here is a question for you netfolk.  I'm not sure if this is the right
>group to ask this in, but I can't seem to find a better one, so here
>goes.  

>What, exactly, is the difference between the Dolby B and the Dolby C
>settings on my tape deck?  What ever happened to Dolby A, if indeed
>there ever was such a thing?  And how, exactly, does dolby work,
>anyways?  From my observations of its performance, it seems to be some
>kind of adaptive filtering scheme, but I would like to have a
>specific, in-depth, engineering-type explanation.

>PS - I hope this doesn't start some kind of holy war thread....

>Thanks, 

>-- 
>-------------------------------
>David Cubanski

>Electrical Engineering Dept.
>Worcester Polytechnic Institute
>Worcester, MA  01609

>cubanski@wpi.wpi.edu
>-------------------------------

Well in a nutshell Dolby A was developed for the recording
industry and used about more than 3 bands which were equalised
depending on signal level. When Dolby wanted to produce a consumer
version they produced Dolby B which has 2 bands to which EQ is
applied coz it was cheaper than doing the full Dolby A. Then
after a while it was as cheap to do another band which helps
on higher performance tape materials. Recently Dolby have
brought out Dolby S again initally for the recording industry,
this has lots of bands and is meant to provide a better SNR than
digital systems. Dolby S is now available commerically.

I think thats about it, maybe the exact number of bands is wrong
but Ive described the general idea.


-- 
Raggy                 | God smiles upon the little children, the alcoholics, and
u9dmlb@ohm.york.ac.uk | the permanantly stoned. S.King.
Newsgroups: sci.electronics
From: medin@catbyte.b30.ingr.com
Subject: Re: blue LEDs
Organization: Intergraph
Date: Fri, 31 Jul 1992 19:05:50 GMT


In article <2A781884.23425@noiro.acs.uci.edu>, rcaslis@hydra.acs.uci.edu (Russell Caslis) writes:
|> 
|> My brother is looking for a source of blue LEDs, even if they are expensive.
|> I remembered the conversation here a while ago, but I never took down the
|> names of any of the companies.  Can someone send me in the right direction.
|> 
|> Thanks.

Digi-key sells Cree Silicon carbide blue LEDs for about $3.00
each. 1-800-DIGI-KEY.


-- 
 --------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    Intergraph Corp.				(205) 837-1174 (h)
       M/S GD3004
  Huntsville, AL 35894 		Internet: medin@catbyte.b30.ingr.com
				UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: RS-422A and RS-423.  Whats the diff?
Date: Wed, 22 Jul 1992 17:17:13 GMT
Organization: U of Toronto Zoology

In article <92Jul21.174720.26587@acs.ucalgary.ca> sepa@enel.ucalgary.ca (Michael Sepa) writes:
>What exactly is the difference between an RS-422A and an RS-423
>standard?  Are they as close as their numbers seem to indicate?

They're about as close as boots and books (which are next to each other
in alphabetical order, but...).  They are completely different standards.
They don't even use the same number of wires.

>The reason I'm asking is that I read that the NeXT machine uses
>the RS-423 standard for its serial communications.  The HP
>deskwriter I own uses the RS-422A standard so it can talk to
>Macintoshes...

If it's talking to Macs, it is *not* using RS-422, because the Macs
don't speak RS-422.  They speak RS-423 (despite some misconceptions
in some early Apple documentation).  If it talks to Macs, it ought
to be able to talk to most anything that speaks RS-423, perhaps with
some fiddling with cables.
-- 
There is nothing wrong with making      | Henry Spencer @ U of Toronto Zoology
mistakes, but... make *new* ones. -D.Sim|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: kludge@grissom.larc.nasa.gov ( Scott Dorsey)
Subject: Re: Airport X-Rays
Organization: NASA Langley Research Center and Reptile Farm
Date: Wed, 29 Jul 1992 14:53:37 GMT

In article <1992Jul29.084952.12730@bronze.ucs.indiana.edu> dny@humus.cs.huji.ac.il (Danny Halamish) writes:
>|> X-rays), but is there real danger to EPROMs ?
>|> 
>A friend of mine just returned from taiwan with two 486 boards, with bios and 
>all. Both have survived the X - rays.
>
>I have had audio tapes X-rayed in airports several times and did not notice 
>any differnce.

X-rays will not harm magnetic tapes at all.  However, the enormous magnets
that X-ray tubes use to focus their electron beam might very well damage 
tapes.  On the other hand, the magnetic field drops off very rapidly
(by the cube of the distance, right?) so it's probably not a big issue.
I always get tapes hand inspected, but I carry around a lot of audio
masters and tend to get paranoid.

X-rays can erase EPROMS, but the dosage has to be extremely high.  Your
friendly neighborhood airport machine won't harm them, but a few days under
a high power industrial X-ray might knock a few bits out of place.  X-rays
will disrupt them while in operation, so turn things off before running
them through the X-ray machine unless you mind your system crashing.
--scott
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Date: 22 Jul 92 11:06:18 CDT
Organization: University of Kansas Academic Computing Services


>Perhaps one shouldn't be bragging - it might prompt some bozo out there to try
>and better the "record". Surely the largest shock _anyone_ has ever received
>is already documented in the Guiness book of records: 

It seems like I had read a Guiness book awhile back that stated the largest
shock ever recieved and the guy actually survived (short of lightning of course
;-) was 375,000 volts from a power transmission line at Davis dam on the
Colorado river. It didn't go into detail of what the shock did to this chap,
but I'm sure it was nasty ! ! ! Considering that judicial execution by the
electric chair is (don't quote me on this) 2200 vac at 5 amps, this guy that
got hit by 375 KV has got to hold the record for being the luckest guy alive as
well !

-=-=- Wes =-=-=
From: adw@cci632.cci.com (Allen Williams (co-op))
Newsgroups: sci.electronics
Subject: 0.100" spacing
Date: 24 Jul 92 13:58:35 GMT
Organization: Computer Consoles Incorporated


 Thanks to all who replied to my question of the green solder mask. The
green stuff is silkscreened and isn't really necessary for homebrew
circuit boards. However, several varnishes exist that will insulate the
board. One of them is a red varnish from GC Electronics, and other kinds
are clear and comes in a spray. Radio Shack doesn't sell something like it
so you will need to look elsewhere.


 Now, I have another question! Previously, I've been drilling holes for my
IC's with a drill press, which isn't so bad for the small 16 pin IC's.
I can usually eyeball where the drill press will drill with reasonable
accuracy, and any variation can be compensated by bending the pins of the
IC socket or IC to fit.

 However, I have a 64 pin IC that I want to put on a circuit board. I don't
wish to have to get a stronger eyeglass prescription after drilling the holes.
So does anyone have any techniques or equipment that they use to drill these
types of things?

 My fantasty drill press accessory is a X-Y sled that fits on the bench of the
drill press. This sled would have clips that my circuit board attaches to. When
I twist some screws, the sled locks, and when I push it in an X or Y direction,
it clicks and locks at every 0.100". Does such a thing exist, or will someone
take this idea, make a fortune selling these sleds, and give me a free sled
in exchange?


 Any tips or pointers would be deeply appreciated.

                                                              Derrick
Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)
Subject: Radar Detectors, and Radar Detector Detectors 
Distribution: world
Organization: null
Date: Tue, 28 Jul 1992 23:00:47 +0000

> I understand, and this may well be completely apocryphal rumour, that
> British TV's must emit a *minimum* amount of IF specifically so they
> can be detected by detector vans.  I understand that there are ways
> (that have been printed in passim amateur electonics magazines) to
> 'shut your TV' up.  I assume these involve shielding (baking foil) around
> the inside of the rear case of the receiver and inserting a high pass
> filter in your antenna feed.  Has anybody got some more concrete info-
> rmation on this?
> 
No self respecting designer would do such a thing apart from the dire side 
effects. Modern design using saw's ic's etc. has very little that could 
significantly radiate. I minimise, ground, shield, I have to with computers 
and digital audio in the same box as the rf/if.

Thought about the line oscillator and power circuits generally? Radiate  like 
mad.

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
                                
Newsgroups: sci.electronics
From: wang@hp4at.eunet.co.at (Wang)
Subject: To G.Hoffmann! (was: Re: Data/Replacement for E402 Dual-J-FET??)
Organization: EUnet EDV-Dienstleistungsgesellschaft m.b.H
X-Newsreader: Tin 1.1 PL4
Date: Tue, 21 Jul 1992 10:12:28 GMT

wang@hp4at.eunet.co.at (Wang) writes:
: I need to replace the E402 Dual-J-FET in a vintage Moog Synthesizer.
: Can't get that part here in Austria, nor have the data of the original
: part availiable!
: Anyone can help me out with this information?

Thanks a lot for your FAX! 

War eine grosse Hilfe!

Due to this quick and efficient reply  I don't have the e-mailaddress!!

reg.
/michael

-- 
Michael Zacherl, Wang Austria Ltd., Vienna         |
E-MAIL: mza@pag.wang.co.at                         | "Everything you wish
PHONE:  +43 (1) 89-111 ext. 433                    |  comes true! (mostly)"
FAX:    +43 (1) 894-17-14                          |         ;-)
Newsgroups: sci.electronics
From: tchannon@black.demon.co.uk (Tim Channon)
Subject: Serial to Parallel conversion RS-232 --> 32 bit Parallel 
Distribution: world
Organization: null
Date: Thu, 30 Jul 1992 23:40:36 +0000

>I was wondering if there is an easy way to "capture" 4 serial bytes from 
>an RS-232 serial port on an IBM compatible machine to be output as 1 32 bit
>wide latched byte.  Perhaps a combination UART and a count to 4 timer?
>Any help on this matter would be greatly appreciated!  Please respond to
>
Very easy, no, but a single chip micro containing a uart and 32 i/o lines is 
practical and it might even be possible to power it from the rs232.

A direct solution using the parellel port would be fairly easy to design.

  TC. 
    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
From: dlou@ECE.UCSD.EDU (Dennis Lou)
Newsgroups: sci.electronics
Subject: Solder Mask Repairs
Date: 29 Jul 92 04:20:31 GMT
Organization: University of California, San Diego


I had a PC board that was heavily corroded.  I managed to scrape away
most of the corrosion, but I also managed to scrape away some of the
green solder mask in the process.

Can I use a resist pen to repair the solder mask or do I need to waste
money on a spray that I don't have?  The area is quite small (less
than a square cm) and I don't want to buy a can of something that I'm
going to use once and throw away.

--
Dennis Lou             || "But Yossarian, what if everyone thought that way?"
dlou@ucsd.edu          || "Then I'd be crazy to think any other way!"
[backbone]!ucsd!dlou   |+====================================================
dlou@ucsd.BITNET       |Steve Jobs and Steve Wozniak went to my high school.
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: derbyc@tplrd.tpl.oz.au (Derby Chang)
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
Organization: Telectronics Pacing Systems
Date: Wed, 29 Jul 1992 22:19:52 GMT

A lot of Laserdiscs are two-sided.  They stamp each side separately, and
then glue the two together.  The only real problem with double-sided CD's
is probably some of the older machines will have motors that are not
powerful enough to run the heavier discs.

Derby.

Newsgroups: sci.electronics,rec.video