HDTenEightyP/NetNews huggingface dataset:
From: dchen@engr.UVic.CA (David  Chen)
Subject: Wanted: -Electrical devices
Reply-To: dchen@engr.UVic.CA
Organization: University of Victoria, Victoria, BC, Canada
Date: Mon, 11 Jan 93 00:20:05 GMT



I am currently building a fuel tank watch system and I'm hoping that 
there is a pre-fab sensor that is capable of measuring the fuel in 
tank and sends out digital data. It will be received by a 
microprocessor.

I am also looking for a device that measures the amount of 
fuel flow in a fuel line to add to my gadget.

If you have any information on this I would appreciate to receive 
an e-mail at dchen@sirius.uvic.ca

Again, I am looking for:

	1- a fuel level measuring device, and

	2- a fuel flow measuring device.

Thank you!


David Chen       |   dchen@sirius.uvic.ca
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: CATV Block Converter Wanted
Date: 11 Jan 93 07:51:12 GMT
Reply-To: paula@nlbbs.uucp
Organization: The Electronics Workbench - Cumberland Maine


In article <ofGiErO00WC0Q2pWNR@andrew.cmu.edu> geek+@CMU.EDU writes:

 > 
 > Is there anything a Radio
 > Shack converter can do that a "cable ready" VCR can't?
 > 
 >                                   -Brian

        Well, for one thing, they can throw a really annoying heterodyne
        (beat pattern of wavy lines) on your screen. . .

        Real answer: no. They just move the frequencies into the UHF
        band so people without cable ready VCR's can tune all the
        channels. Many of the cheapies do a real number on the quality
        of the sig, too.
Newsgroups: sci.electronics,rec.audio.pro
From: randy@n1gva (Randy - KA1UNW)
Subject: Re: Question: What to lubricate plastic pots with?
Organization: Evil Weather Machines LTD
Distribution: usa
Date: Sat, 9 Jan 93 20:21:22 GMT

tome@cs.umr.edu (Tom Erb) writes:
: I know, it's really a clause in the subject line, but I think it gets the
: point across. 
: 
: I maintain a small FM radio station, and we have many conductive plastic 
: potentiometers in our mixing boards. These things are fairly expensive.
: They get noisy after a while, but if I take them apart and clean/lubricate
: them, they never feel nearly as smooth as they did before. I've tried using
: "Big Bath" from ECG, and some other chemical from ECG that said "Cleans and
: lubricates potentiometers." I haven't taken apart any of the expensive slide
: pots yet as they haven't caused any problems, but the rotary pots have.
: 
: Reply by posting or email, I'll post a summary of any emailed responses.
: 
: Thanks,
: 
: Tom Erb (tome@cs.umr.edu)
: Chief Engineer: KMNR 89.7fm, Rolla, MO
: around the place. 

  You may want to look real close at the oiginal lube used on those...
It's a grease! By using a liquid cleaner & lube , you washed away the grease.

 I had a similar problem with aluminum pots ( shaft and bushing = aluminum)
which had a very thick, sticky grease fo 'lube'.

 I'd say to not clean the bearing surfaces....just the wiper/resistive element.
                          =======
--
 I'd like to know what that grease is / where to get it.


Newsgroups: sci.electronics,misc.legal
From: bhayden@teal.csn.org (Bruce Hayden)
Subject: Re: Recommend a book on "Patenting Your Invention"?
Organization: Colorado SuperNet, Inc.
Date: Mon, 11 Jan 1993 06:08:45 GMT

kehoe@netcom.com (Thomas David Kehoe) writes:

>Would someone recommend a book about "How To Patent Your 
>Invention"?  There must be several available.

>I took Patent Law at the University of Chicago Law School, so I 
>know the theory.  I don't know what paperwork you file, how to do 
>a patent search, etc.  Luckily I live near Sunnyvale, so I could 
>go to the Patent Office there.

If you are an attorney, and want to advise someone else, 
instead of writing a patent yourself, I would suggest one
of the patent bar sets of books. I used Kayton, and it is
very good. By the time you get done, you know what you need
to at least know when you are getting in trouble.

Much of the paperwork is described in 17 C.F.R. and the MPEP
(Manual of Patenting Examining Procedures). These are the bibles.

Finally, as far as patent searches go, I would suggest using 
a Washington, D.C. searcher. The ones I have dealt with do a good
job, at a reasonable rate ($100 - $150) (But no opinion included -
just the patents turned up). They use the search room at the PTO,
know the examiners in many cases, and just tend to do a better job.

Bruce E. Hayden
(303) 758-8400
bhayden@csn.org

Newsgroups: sci.electronics
From: siim@waterloo.hp.com (Brad Siim)
Subject: Re: Scope Suggestions?
Date: Wed, 6 Jan 1993 21:59:50 GMT
Organization: HP Panacom Div Waterloo ON Canada
X-Newsreader: TIN [version 1.1.8 PL6]

Sakari Aaltonen (sakaria@vipunen.hut.fi) wrote:
: I'm thinking of buying an oscilloscope. I wonder if anyone would care
: to offer suggestions as to what I should look at? Maker? Type?
: 
: Two channels should suffice, but I really don't know about bandwidth.
: I'm mostly interested in digital signals, so the usual entry-level 20MHz
: is probably too small. Let's say 25ns pulses should be at least visible -
: would 40 MHz be enough? Or is it rise time that matters?
: 
: Thanks in advance,
: -- 
: --------------------------------------------------------------------------
: Sakari Aaltonen                              Email: sakaria@vipunen.hut.fi
: "... implementing hardware interrupts in a PC peripheral interface is like
: falling off a log."              Horowitz and Hill, The Art of Electronics


You probably want to buy a scope that has a single shot capability of no
less than 50 Mhz.  You will be better off with a digital storage scope that
allows you to capture the waveform, pan along a stored image, change the
timescale of a scaled image and do advanced triggering.  Do NOT consider a
high frequency scope that has a bad single shot figure, you will be 
disapointed.  If you are interested in looking at rise/fall time/undershoot/etc
than the higher the better.  I work for HP so I am only exposed to our stuff.



Consider this:

                    HP 54504A     HP 54505B      HP 54506B
-repetive           400 Mhz         300 MHz        300 MHz
-singe shot			 50 Mhz         125 Mhz        125 MHz
-channels             2               2              4
-price				$6750 US        $8350 US      $13990 US

I have taken this info out of HP's 1993 Catalog. I do not quarantee it's
correctness.

Good luck, Brad Siim
From: keithl@klic.rain.com (Keith Lofstrom)
Newsgroups: sci.electronics
Subject: High Efficiency Fluorescent Lighting   was:  Re: What really Failed on Fluorescent Lamp
Date: 5 Jan 93 05:53:26 GMT
Article-I.D.: klic.1993Jan5.055326.2966
Organization: Keith Lofstrom Integrated Circuits

In article <1993Jan4.225724.29960@panix.com> dannyb@panix.com (Daniel Burstein) writes:

>As long as you're replacing the unit, you might want to check out the
>high-frequency ballasts that have recently become available.  Rather than
>use the line frequency, which can leave your flourescents with a noticable
>flicker (especially when you're using them around electrical equipment),
>these are in the khz range, tend to be smaller and lighter, and
>(supposedely) use less power than the more traidtional units.


I will second this.  I am running my large basement office with 120 watts
into 4 tubes running off of two electronic ballasts.  It is very bright -
perhaps too bright.  Much brighter than the 160 watts of T12 40 watt that
used to be in here.  And brighter still than the 200 watts of rather dim
incandescent that were originally in here.  No flicker or noticable hum,
either (you can hear a slight hum if you park your ear right on the
ballast).  They also turn on right away, unlike the sputtering startup
of the old inductive ballast fixtures.

I am running single bulb fixtures (actually rewired double bulb fixtures,
two fixtures on one ballast).  The pre-modification fixtures are $8 each,
and the ballasts (which drive two tubes) are $36 each.  The T8 tubes are
$4 each, and come in a variety of spectrums.  The guy at the wholesale
lighting place I bought them from had display boxes with about 15
different shades of white, from pinkish to yellowish to bluish.
Deciding on the spectrum was the hardest part of the whole process.

By the way, the old style fat bulbs are T12, which means 12/8ths or 1.5
inches in diameter.  The new bulbs are T8, or 1.0 inch in diameter.
While the pin positions are the same, the bulbs are not electrically
compatable.  The T8 bulbs I have are made by Phillips.  The ballasts
are "EBT" from Taiwan.  I don't know where to find replacements besides
the wholesale lighting place - they aren't in the retail stores, which
may be a consideration for some.

I am saving about 500 watts over incandescent, 16 hours a day - about $150
a year in electricity, so the lashup pays for itself in less than a year.  
More importantly, I can stare down the eco-twits who demand legislation
and use incandescent lights themselves.  So much fun...

Fiat Lux!

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: nagle@netcom.com (John Nagle)
Subject: Re: Why etch? Is copper deposition possible?
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Mon, 11 Jan 1993 04:27:13 GMT

gantzm@gantz.bowlgreen.oh.us (Michael L. Gantz) writes:
>I have been reading all the articles concerning the etching of circuit
>boards, something I have a great need to do.  And they all assume that
>one would be etching the copper off of the board.  Is it possible for
>the home hobbyist to devise a system to deposit copper onto blank
>boards?

>After the circuit images have been developed the board would then be
>treated either chemically or electrically to bond copper to the traces
>developed on the board.  The might solve the problem of plated through
>holes as they might get coated also.

       The process by which boards get "plated through" holes could
in theory do something like this, but that process is substantially
more complex than regular board etching.  Home board etching is
common; I've never heard of someone doing plated through holes at
home.  

       There are pens for "writing" conductive ink onto blank boards,
but this is more of a tool for making minor changes, not a way of doing
whole boards.  

       Right now, board houses are so hungry for work that discounts
can be negotiated and delivery is really good.  And the quality is far
better than you can do at home.  If you're doing anything fancier than
single-sided boards, go with a commercial PC board fab house.  Single-sided
boards you can do yourself, if you're so inclined.  If you have to do it
on the cheap, design a single-sided board, using wire jumpers when you
have to cross traces, don't try to put more than one trace between
IC pins, and try making your own board.  Worth doing once in your life.

					John Nagle
Newsgroups: sci.electronics,alt.cd-rom
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: chip vendor databooks/sheets/applic notes
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 6 Jan 93 08:57:29 GMT

Ken Dykes (kgdykes@thinkage.on.ca) wrote:
: do any semiconductor makers have available on CD-ROM their databooks and
: application notes?
: 
: seems to be an ideal way to avoid killing a few tonnes of trees per engineer.
: 
: people like me who cant really justify or squeeze out of sales people
: sets of databooks wouldnt mind paying a 20-50$ for a CD-ROM.
: 
: my particular fascination this week is with MAXIM, EXAR and Motorola chips.
: 
: but i would be interested in hearing of any vendor/brand making CD-ROMs
: available.
: 
: on a tangent to this: any of them using network/dialup/BBS accessability to
:    their semiconductor data ?
: 
:     -ken, whose set of dead trees is from 1984ish for TI/Motorola/Intel/Signetics
 



Ken,

I do know that MAXIM and Motorola have their semiconductor catalogs on 5.25"
floppy disks and they are usually free for the asking.  Think that's cheap
enough?


Jerry


"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues

: 
Newsgroups: sci.electronics
From: cmwolf@mtu.edu (christopher m. wolf)
Subject: Re: MUSCLE WIRE
Organization: Michigan Technological University
Date: Mon, 4 Jan 1993 21:04:47 GMT

tjgerman@53iss6.Waterloo.NCR.COM (Trevor German) writes:
>
>	Someone posted here the address where one can buy some of
>	this stuff. I lost the post. Can someone please mail me
>	the address.  Thanks
>
>

Try Mondo*Tronics
524 San Anselmo Ave, #107
San Anselmo, CA 94960

Phone: 415-455-9330
Order: 800-374-5764
Fax:   415-455-9333

email: mondo@holonet.net


Nice people.  I must have gotten on their mailing list, since every other
month, they send me the same flyer again.  I'm still waiting for them to
get my name right.
Xref: sparky sci.electronics:22044 rec.video:15454 rec.audio:17890 comp.dcom.lans.ethernet:2910
From: brennan@hal.com (Dave Brennan)
Newsgroups: sci.electronics,rec.video,rec.audio,comp.dcom.lans.ethernet
Subject: Help wiring new home for audio/video/phones/computer
Date: 6 Jan 93 00:38:16 GMT
Organization: HaL Computer Systems, Austin, TX
NNTP-Posting-Host: hysteria.hal.com

I'm having a house built and will be doing the wiring for cable, phones,
audio, twisted-pair, and ISDN (?).  Can anyone suggest or recommend a source
for the wiring (coax, audio wire (what kind??), and type 3 or type 5
multi-pair), outlets (coax and configurable phone, serial, thin ethernet),
push-down blocks, patch panels, and anything else that would be useful?
Since I'll have phone, serial, and twisted-pair, I was wondering if there's
anyway to get away with using a single patch panel instead of three.

Overall I'm interested in minimizing my costs without sacrificing too much
in the short term and not locking myself out in the long term.  I've never
done anything to this scale before (just wired phones and audio) so
suggestions in general to the task at hand would be greatly appreciated.

Thanks in advance!

--
Dave Brennan                                      HaL Computer Systems
brennan@hal.com                                         (512) 794-2855
--
Dave Brennan                                      HaL Computer Systems
brennan@hal.com                                         (512) 794-2855
Newsgroups: sci.electronics
From: tadams@sbctri.sbc.com (Tom. Adams 529-7860)
Subject: EPROM programming info.
Organization: Southwestern Bell Technology Resources, St.Louis, MO
Date: Fri, 8 Jan 93 14:45:44 GMT

A while back I bought a very old EPROM programmer, which requires 
jumper changes for various types of EPROMS, and using a resistor as
a jumper to change programming voltages.  It also is extremely dumb
wrt programming and reading.  You send it a character and it writes
it and increments the address.

I'm looking for pointers to programming information for various EPROMS,
and the file formats used by common programmers.

Are all, say, 2764's programmed the same or do different manufacturers
use different times and voltages?  Where can I find out more about this?
-- 
Tom Adams	tadams@sbctri.sbc.com 	Voice 314-529-7860, FAX 314-529-7573
If we bounce your mail, and you can fax me the errors, it would be greatly
appreciated.  I need it to get someone to address the email problems here.
Newsgroups: sci.electronics
From: cab@col.hp.com (Chris Best)
Newsgroups: sci.electronics,rec.games.programmer
Subject: Re: Sort of a Joke - sad though...
Date: 6 Jan 1993 17:50:24 GMT
Organization: your service
Distribution: na
NNTP-Posting-Host: hpctdke.col.hp.com

> If I remember, the Nintendo manual say that you should not connect
> the game to projection TVs. Anyone know why? 

----------

Just a guess, since I know little of Nintendo (and I like
it this way) - if they offer a device that senses screen
position when you aim it at the TV (like a pistol, or isn't 
there some sort of shoulder-held bazooka now?), it probably
won't (or won't) work properly.  

To answer what you MIGHT be asking, it won't hurt the TV.
Newsgroups: sci.electronics
From: rick@imp.phys.ethz.ch (Riccardo Sibilia)
Subject: Tektronix 4125 (or 15) monitor
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
Date: Tue, 12 Jan 1993 08:35:39 GMT

Hi!

I can have an old Tek 4125 or 15 terminal for free,
and I intend to use the 19" monitor with another
computer. Does anybody know which signals I need,
and what the pinout of the connector is. There are
4 connectors. For 3 is is quite easy since they are
BNC, so I assume these are the RGB, but there is still
another one with the syncs which is not so easy to 
guess. Thank you for any help!

Regards,

Riccardo Sibilia

rick@imp.phys.ethz.ch

Newsgroups: sci.electronics
From: ericc@Arco.COM (Chang Eric(214)754-3562)
Subject: some answers to flywheel questions
Organization: ARCO Oil and Gas Company
Distribution: usa
Date: Wed, 6 Jan 1993 21:35:00 GMT

I have followed the flywheel thread with interest.  I have noticed, however,
that there has been a notable lack of citation of experimental results.  While
on vacation in Stanford, I checked out the Socrates catalog for entries on
flywheels.  There was one reference authored by G. Genta.  It has a lot of
interesting stuff in it.

There is a whole section on burst testing and containment.  It turns out that
most of the posts have made some sensible points, but there is no substitute
for actual testing.  There is a setup for destructively testing these things,
and that is extremely interesting in its own right (high power, repairs to the
facility, turnaround, etc).  There is also a reference for Composites (a
journal) for an article on the results of 50 successful burst tests and the
nature of composite wheel failure.  As I thought, the energy is not the main
problem.  The wheel does degenerate into "fluff" which is very easy to contain.
(See the section on containment of much more nasty objects, w/photos.)  The big
problem is that even though the fluff is fairly easy to contain (and 
presumably much of it stays with the wheel), the big problem is how to avoid
problems with torque (not all of the energy is in the fragments).  There are 
sophisticated ways to deal with this which are extremely interesting.  They
cover arragements on how to dump megajoules of energy to the air in times on
the order of 30 seconds.  There are prototypes in use, but supposedly there is
not a flywheel only car.  There is a hybrid system which gives a 10% increase
in economy where the flywheel is simply used to restart the engine after 
braking.

Before Carl Lydick gets too riled up, there is an opposing viewpoint in a 
neighboring book.  Basically, some engineers study different alternatives for
flywheels to recover braking energy in an electric train.  Composite flywheels
are rejected because of cost and quality problems.  Supposedly, they are almost
impossible to balance.  Thus, the issues of safety are moot.  These guys went
with a heavy slow steel disc.  It turned out to be too costly for retrofit.
They have pictures.

From the standpoint of engineering, there are many ways to look at things.  A
theoretical viewpoint is fine, but relying solely on theory can cause one to
get blindsided with reality.  For example, the engineering column in the latest
issue of American Scientist has some excellent and entertaining stories.  Of
course, this could be all a hoax, but the books do have pictures and figures.
Also, there are many details about testing which, even if faked, are quite
plausible and interesting.  If someone is interested, perhaps they could
convince another, who has easy access to the Terman Library, to obtain more
details.  My opinion is that they will not work, but are plenty interesting.
    Eric

Newsgroups: sci.electronics
From: mrapple@quack.sac.ca.us (Nick Sayer)
Subject: NTSC sync rate questions
Organization: The Duck Pond public unix: +1 408 249 9630, log in as 'guest'.
Date: 11 Jan 1993 20:46:24 UTC

I have an NEC 5FG. It is a multisync RGB monitor. I also have the CPU
boards for an arcade video game. It has NTSC timed analog RGB output.
I want to know if the two will be compatable. I suspect they will, but
I am confused:

It's my understanding that the vertical retrace rate of NTSC is 60 Hz,
and that it is interlaced, yielding 30 pictures per second. But the
monitor says 55-90 Hz vertical sync rate. That sounds compatable
to me.

It's my understanding that the horizontal retrace rate of NTSC is
14 kHz. The monitor says that its acceptable range is 27-79 kHz.
Now 14 x 2 is 28, but am I reading too much into that coincidence?
Am I wrong about the NTSC horizontal rate? Or is NTSC too low-res
for such a fine monitor to deign to display? :-)

-- 
Nick Sayer <mrapple@quack.sac.ca.us> | "Turn around. Stick it out.
N6QQQ @ N0ARY.#NOCAL.CA.USA.NOAM     | Even white boys got ta shout:
+1 408 249 9630, log in as 'guest'   | Baby got back!"
PGP 2.1 public key on request        |   -- Sir Mixalot
Newsgroups: sci.electronics,rec.gambling
From: psfales@cbnewsc.cb.att.com (Peter Fales)
Subject: Re: Consumer Electronics Show (CES) Ticket?
Organization: AT&T
Distribution: usa
Date: Wed, 13 Jan 1993 03:10:31 GMT
Keywords: CES

In article <1993Jan5.230055.1741@cbnewsk.cb.att.com> garyk@cbnewsk.cb.att.com (gerhard.karnik) writes:
>I just found out I will be in Las Vegas this Saturday. This is the same time
>that the Comsumer Electronics Show and I would like to attend. I know 
>this is just for industry folks, but I do work for AT&T. If I just walk 
>up to the registration area, will I be able to get a ticket? Does anyone 
>have a phone number for CES registration so that I can ask myself?

If you are willing to pay the fee (around $30, I think), you can walk in
off the street.  You need to prove you are part of the "industry."  This
normally means a business card and another form of ID.  I had no 
problem with my AT&T business card at CES last summer in Chicago. 

-- 
Peter Fales			 AT&T, Room 9C-242
N9IYJ            		 2000 N. Naperville Rd.
UUCP:	...att!ihlpb!psfales	 Naperville, IL 60566
Domain: psfales@ihlpb.ih.att.com work:	(708) 979-8031
Newsgroups: sci.electronics