HDTenEightyP/NetNews huggingface dataset:
From: mpaul@unlinfo.unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: Re: A construction question about front panels for home-brew projects...
Date: 21 Aug 92 15:47:35 GMT
Article-I.D.: unlinfo.1992Aug21.154735.5488
Distribution: na
Organization: University of Nebraska - Lincoln

bonobo@Ingres.COM (David Victor) writes:

>I'm trying to make a nice-looking aluminum front panel for a project,
>and I'd like to be able to use rectangular switches, possibly other
>squared-off displays, etc.  How do you cut a perfectly-squared-off hole
>in an aluminum panel?  Is there some home-brew method I'm not aware of?

>Also, what's a good way to do the lettering?  I've got a LaserJet, but
>how do you transfer what's on paper to what's on the panel?  

One way that I like a lot uses a laser printer and clear overhead projector
film transparencies.  As always, MAKE SURE YOU'VE GOT THE KIND OF TRANSPARENCY
DESIGNED FOR PHOTOCOPIERS/LASER PRINTERS, not the thermal stuff that will
turn black and gum up your LaserJet.

Anyway...what we've done is draw up the whole front panel, with all labels
and markings for where holes will go, etc., using a graphics program, in
our case AutoCAD.  Then we use the software to mirror the drawing so all the
text is backwards.  Then we print it out on a LaserJet using the transparency
film.

Now...take your transparency and spray paint the side that has the toner
on it.  (Let it cool off first or it may smear.)  After the paint dries,
you'll have a piece of plastic where you can read your letters from the
back side, only they read OK because you reversed them to start with.
Obviously, you want to choose a paint color that the black toner will be
visible against - we use gray.

After the paint is dried, you can use trim adhesive or other glue to stick
your front panel on.  The way I prefer to do this is put on the label
before I drill and machine the holes - that way my drawing can also show
me the exact place to cut and drill.  The downside is that the plastic
layer can kind of gum up your drill and you sometimes have some ragged
plastic edges to trim afterwards.  Still - you end up with extremely
durable, good looking labels, because the print is on the other side of
the plastic and can't wear or wash off.


--
===============================================================================
paul marxhausen                              \/               grace 
university of nebraska - lincoln             /\              happens           
===============================================================================
Newsgroups: sci.electronics
From: sakaria@vipunen.hut.fi (Sakari Aaltonen)
Subject: Re: Beginners Question: RAS, CAS, and Refresh?
Reply-To: sakaria@vipunen.hut.fi (Sakari Aaltonen)
Organization: Helsinki University of Technology
Date: Tue, 18 Aug 1992 12:59:13 GMT

In article <etxansk.714131335@garbod20> etxansk@garbo.ericsson.se writes:
> ...........
> The RAS and CAS signals are probably input signals to the
>chip used during addressing. I've assumed that they're used
>to tell the chip whether it's the most or least significant
>part of the address vector that's currently on the address
>bus. If I'm right about this, how come there are _two_
>addressing control signals?
>
The two signals come about - I think; I don't design these
chips - because some sort of clock or AC signal is needed
in any case for refresh. Then, the multiplex signal is needed.  
RAS and CAS do these. They - or rather, their relationship -
is used to tell the chip other things, too; see below.

> For the Refresh signal: I can't recall if this one really
>is a pin on the chip or if it's some event that's done with
>other signals. I've heard that certain types of chips need
>this signal in order to work properly. What is the CPU (or
>the main clock, or the addressing logic) supposed to do to
>give the memory chips the refresh?
> 
> Anders Skelander
> 
Most, if not all, current dynamic RAMs have internal refresh counters.
An input called REFRESH would be used to tell the chip it's OK
to refresh the memory cells with the address given by the counter.
However, there are other ways of doing this, CAS-before-RAS for
example. Then, the input is not needed, which frees one pin.
Pins are dear, which is why the REFRESH pin has fallen out of use.
-- 
-----------------------------------------------------------------------------
Sakari Aaltonen                             Helsinki University of Technology
Email: sakaria@vipunen.hut.fi
---  You can't keep a Finn down without him getting all red in the face  ----
From: brianv@amiserv.chi.il.us (Brian Vargyas)
Newsgroups: sci.electronics
Subject: Black Burst NTSC Generator IC
Date: 16 Aug 92 01:51:52 GMT
Organization: Amiga Network Information Systems

Hello!  I'm looking for a source for black burst NTSC generator IC's.

Anyone have a good source for them?   Also, anything else out there as
far as a 8 x 8 crosspoint audio switching IC?  I already am looking at
the Dallas Semiconductor one, but wondered if anything else exists out
there..

--
brianv@amiserv.chi.il.us

-- 
brianv@amiserv.chi.il.us    Amiga Network Information Systems
708-983-6678                AT&T SVr4 UseNet News/Mail Server
From: Randy.Baer@f310.n3603.z1.FIDONET.ORG (Randy Baer)
Newsgroups: sci.electronics
Subject: new here
Date: Wed, 12 Aug 92 18:11:22 EDT
Organization: FidoNet node 1:3603/310 - Tetragrammatton, St Petersburg FL

  Just want to say HI..take up a little bandwith for a HOWDY DOODY.
Hope to be reading and posting here.  Just start my senior yr at the
local uni  (USF).
Tetragrammatton Enterprises
  Just a poor student
v of tee is equal to L time dee I dee T
  lost somewhere in the Integral. 

--  
Internet: Randy.Baer@f310.n3603.z1.FIDONET.ORG
UUCP: ...!myrddin!tct!psycho!310!Randy.Baer
Note:psycho is a free gateway between Usenet & Fidonet. For info write to
     root@psycho.fidonet.org.
Newsgroups: sci.electronics
From: aroest@fwi.uva.nl (Axello de Roestello)
Subject: Re: Phone in use light - help!?
Organization: FWI, University of Amsterdam
Date: Mon, 17 Aug 1992 12:58:29 GMT

feiges@jomby.cs.wisc.edu (Howard Feiges) writes:

>Hello there feiges here

>Ive moved into my new apartment and I now have 5 phones throughout
>My roomates pick up on my conversations and modem.  I need a simple little 'in
>use' light or LED device. help?!

What you really need (IMHO) is a device which lets only one phone use the
phone line, yet rings all telephones when someone is calling you. If someone
picks up another phone when you are calling, he (she)'ll hear nothing.
This is also useful when you use your modem and someone picks up the phone, 
resulting in hundredths of strange characters zapping over your screen.

The little device I'm talking about exists to handle two phones on one line, 
but I also have seen extensions for multiple phones. It only contains some 
R's, C's a fet and 2 relays. However I don't have a schematic (I can draw one
if you want) since you can buy them of the shelf for about $7 (here in Amsterdam)


Axel
P.S. Why don't you get a personal PBX :-)
-- 
axel@phys.uva.nl     | In the beginning the Universe was created.
aroest@fwi.uva.nl    | This has made a lot of people very angry
                     | and been widely regarded as a bad move.
                     | (Douglas Adams)
Newsgroups: sci.electronics
From: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Subject: Re: Guided Vehicles
Reply-To: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Organization: Columbia University
Date: Fri, 14 Aug 1992 15:50:48 GMT

In article <josef.713714826@uranium> Josef Moellers <mollers.pad@sni.de> writes
>In <kwilli.2@elaine.ee.und.ac.za> kwilli@elaine.ee.und.ac.za (KEVIN WILLIAMS : THIRD) writes:
>>I am currently investigating circuitry to provide automated guidance to a 
>>model car by means of a wire taped to the floor carrying some high frequency 
>>signal which is detected by sensors on the car. This is used to provide 
>>steering information etc.
>
>I can think of two other ways:


Several years ago I was up in some law firm and I saw a motorized mail-cart
making the rounds, turning at corners, etc.  I looked at the floor and didn't
see any track, so I asked.  Turned out that they had this aerosol spray on
the carpet that left a trail (magnetic, I suspect) that the cart followed.
Had to be resprayed every so often.

Apparently when they first got the system installed, some prankster got hold
of the spray can and had the cart go crashing into the ladies' room.


--
Gabe Wiener - Columbia Univ.     "This 'telephone' has too many shortcomings 
gmw1@cunixa.cc.columbia.edu       to be seriously considered as a means of 
N2GPZ in ham radio circles        communication. The device is inherently of
72355,1226 on CI$                 no value to us." -Western Union memo, 1877
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Re: LCD Displays
Date: 23 Aug 92 01:39:30 GMT
Distribution: usa
Organization: U of Wisconsin-Madison College of Engineering

In article <21AUG199222053658@lims01.lerc.nasa.gov> tidedu@lims01.lerc.nasa.gov (WILLIAM DEDULA) writes:
>Hello;
>I am having a hard time finding the type of Liquid Crystal Display which I 
>need. A am building a circuit which must begin at 10 and count down to 0 
>using a LCD display. So far, the only LCD displays I can find (And I've 
>looked a lot) either require an analog signal, or they are controlled via. 
>a computer. I require a display where the individual segments of each 
>digit can be controlled so I can use a LCD driver chip (If one exists) 
>to convert a BCD input (From a Binary Counter Chip) to a digital display. 
>Is this capabibility available with a LCD display ? If so, could you 
>recommend manufacturers of the LCD display's themselves, as well as the 
>Driver Chips. 

Check out a DigiKey catalog (if you don't have one, you can request one by
calling 1-800-DIGI-KEY).  Their selection could stand to be bigger, but they
do carry what you seem to want (2 digit displays).  The listing of the displays
contains a column that suggests driver chips.
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Newsgroups: sci.electronics
Subject: Re: "Chip chat" AY-3-1015
Date: 19 Aug 92 15:46:00 GMT
Article-I.D.: rover.19AUG199209464059
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
News-Software: VAX/VMS VNEWS 1.41

In article <10666281.14.714208429@eng2.eng.monash.edu.au>, 10666281@eng2.eng.monash.edu.au (KEVIN PRATER) writes...
>I ve just dug out an old project for an xy plotter
>from electronics and wireless world dec 1984.
>It had a chip marked AY-3-1015 which they said was a uart chip.
>can I substitute a NS16450 at uart for this?

	The AY-3-1015 was one of the earliest UARTs. (Came out circa 1073.)

	Just about any of the common 40-pin uarts will match.

   Frank R. Borger - Physicist    __       Internet:  Frank@rover.uchicago.edu
Michael Reese - Univ. of Chicago |___      Phone : 312-791-8075 fax : 567-7455
  Center for Radiation Therapy   | |_) _   
    2929 South Ellis Avenue        | \|_)  Too many pieces of music finish too
    Chicago, Illinois 60616           |_)  long after the end. - Igor Stravinsky
From: nagle@netcom.com (John Nagle)
Newsgroups: sci.electronics
Subject: Re: Guided Vehicles
Date: 14 Aug 92 18:26:28 GMT
Article-I.D.: netcom.9z6m-5m.nagle
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

In <kwilli.2@elaine.ee.und.ac.za> kwilli@elaine.ee.und.ac.za (KEVIN WILLIAMS : THIRD) writes:
>I am currently investigating circuitry to provide automated guidance to a 
>model car by means of a wire taped to the floor carrying some high frequency 
>signal which is detected by sensors on the car. This is used to provide 
>steering information etc.

      This is a common way of guiding factory robot vehicles.  The wire
usually carries a current modulated with some audio frequency, and the
vehicle has a pair of tuned amplifiers connected to sensing coils.
The difference from the amplifer outputs is used to generate steering
corrections, and the sum of the amplifier outputs must be above some
threshold to indicate that the wire is actually being sensed.

      You can also transmit other control info over the wire, using a
carrier-current radio system.  This is all standard technology in 
factory automation today.

      The latest generation of AGVs have enough navigational capability
to leave the guide wire for short distances.  So typically the wire
can run straight down an aisle, and the AGV can turn off the wire to make
a stop at some machine it feeds.  Caterpillar makes a lift truck like
AGV that uses this approach.

					John Nagle
Organization: Junior, Electrical and Computer Engineering, Carnegie Mellon, Pittsburgh, PA
Newsgroups: sci.electronics
Date: Mon, 17 Aug 1992 12:15:55 -0400 
From: Wayne Alan Martin <wm1h+@andrew.cmu.edu>
Subject: WaveTek 155

I just bought a WaveTek 155 Programmable VCG from a factory closing sale.
I would like to have a manual for it, I was wondering if anyone out
there could help me with places to look, address for WaveTek, or even
sell me a copy.  Thanks for any help you can give me.

Wayne Martin
From: misra@scout.ksu.ksu.edu (Boo!)
Newsgroups: sci.electronics
Subject: Variable Speed Drives
Keywords: motors and drives.
Date: 20 Aug 92 11:58:39 GMT
Article-I.D.: scout.1714ifINN3o2
Distribution: world
Organization: Kansas State University
NNTP-Posting-Host: scout.ksu.ksu.edu


	can anyone suggest some good books which discuss variable speed
drives in depth. I have found a few but they havent been of much help.
Thanks for any help you can give. take care..

						misra@matt.ksu.ksu.edu
From: mmaster@parnasus.dell.com (Michael Masterson)
Newsgroups: sci.electronics
Subject: Re: Are Seagate Hard Drives any Good ?
Date: 18 Aug 92 19:39:50 GMT
Distribution: usa
Organization: Dell Computer Co

wrb@cbnews.cb.att.com (wallace.r.blackburn) writes:

>Seagate got a bad rap some time ago for some seemingly bad drives (the
>ST-251 comes to mind).  There is an argument though that the drives were
>really not the problem as much as how people were using them.  They were
>popular in DOS PCs where people knew very little about how such things
>should be treated.

>They shut them down without parking the heads, turn the computer off in the
>middle of a disk access, etc.  Now you could say "If people are going to
>use them like that, they should make them to withstand it."  I think that
>what they started doing - but they learned on the ST-251 types.

Seagate ST251 drives self park, you can unplug them and they'll park,
they use the back-emf from the spindle motor to power the stepper
motor into a parked position.  

The problem (speaking as someone who replaced HUNDREDS of ST251s in
his past days in tech support) was that Seagate put too much lubricant
on the platters, and after a while, it'd ball up on the leading edge
of the heads, then when they touched down, (and the drive was hot) the
ball of lubricant would get pulled under the head, and flow around it
making a good secure seal, as long as the lubricant was new, it was
ok, but after it'd been heated and cooked some, (and the 251's
typically ran pretty hot), it'd turn to sludge, sticking the heads to
the platters so the drive wouldn't spin up.

that was the cause of about 95% of the field failures we experienced,
and why we'd end up shipping out CDC 40 mb drives to replace the
Seagates.  They cost us more up front, but it was cheaper than continuing
on sending out drives that we knew would fail.
-- 
Simulated by professionals, do not try at home, see your dealer for details.
Your mileage may vary. Call before digging. Best if eaten by date on package.
Apply only to affected area. Batteries not included. Member FDIC. 
Michael Masterson                                   mmaster@parnasus.dell.com
Newsgroups: sci.electronics
From: cwagner@ee.ualberta.ca (Chad Wagner)
Subject: LOAD DUMP? automobiles
Summary: What are they and how can they be stopped?
Organization: University Of Alberta, Edmonton Canada
Date: Sat, 22 Aug 1992 02:48:55 GMT

I am building a 12 volt circuit for an automotive application and would like
to understand how a Load Dump could harm my circuit.
Can any one help me?

Chad G. Wagner
cwagner@bode.ee.ualberta.ca

Newsgroups: sci.electronics
From: jeremym@fraser.sfu.ca (Jeremy Thomas McDonald)
Subject: Needed: Serial->Parallel FIFO
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Tue, 18 Aug 1992 23:36:45 GMT

Looking for a Serial->Parallel FIFO like the IDT 72132L series, or
maybe not :)  Just need a cheap one.  I have been unable to find a
source on inexpensive FIFO chips.  I am looking for one around the
20-30 dollar range (CAN).  Speed is not a major concern, as long
as it is sub-100ns.  The width must be at least 256 bytes and depth
must be at least 8 bits.  If there is a 256x8 one available, that 
would be ideal.  It also needs a half-full flag as output (no other
flags are required).
Any help would be much appreciated.
e-mail to: jeremym@fraser.sfu.ca
--------------------------------
yes, a lowly university student.

Newsgroups: sci.electronics
From: gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan)
Subject: Re: GPS questions
Summary: What is the necessary length of GPS correlator
Keywords: GPS
Organization: Arizona State University
Distribution: usa
Date: Fri, 21 Aug 1992 03:53:54 GMT


>arkusins@esseye.si.com (Andy Arkusinski) writes:
.......
> Each GPS satellite transmits a course acquisition (C/A) code that is unique
> to the satellite. This code is a pseudorandom noise (PN) code that repeats
> every millisecond.  PN codes have the attribute that the mathematical
> cross-correlation function between two PN codes is a large positive number
> when the two codes are identical, and close to zero otherwise.

I would expect there to be problems in discriminating among codes if very
short sublengths were tested for. For example, 1100111000 probably occurs
in all the codes. So once "trial correlation" happens, longer/entire pattern
matches must be done. What is a useful sublength to use, to adequately avoid
false trial correlations?
Allen Sullivan      gsulliva@enuxha.eas.asu.edu
From: lauren@vortex.COM (Lauren Weinstein)
Newsgroups: sci.electronics
Subject: PADS -> "wirewrap" ?
Date: 20 Aug 92 05:02:09 GMT
Organization: Vortex Technology

Greetings.  Has anyone written a script to convert any of the
PADS-LOGIC network output formats to a format suitable as input to
geowhiz!karsh (Bruce Karsh's) "wirewrap" listing program?

Thanks.

--Lauren--
From: cam@castle.ed.ac.uk (Chris Malcolm)
Newsgroups: sci.electronics
Subject: Re: Electric Blankets and Sterility
Keywords: Electric Blankets Sterility
Date: 19 Aug 92 23:56:46 GMT
Organization: Edinburgh University

In article <1992Aug19.123408.11089@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
>In article <1992Aug19.170303.15912@uniwa.uwa.edu.au> gude@uniwa.uwa.edu.au (David J W Emrich) writes:

>>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.

It's very easy to measure the field left when the blanket is switched
off. The still-connected earth or neutral line acts as a large aerial
lying alonside the mains, and picks up a great deal of main hum and
other interference. If the switch isolates all lines there is still
capacitive coupling. And if the plug is pulled out the wall the
blanket still acts as an aerial. 

All of this is easily measured. It's another question whether it hurts
people.
-- 
Chris Malcolm    cam@uk.ac.ed.aifh          +44 (0)31 650 3085
Department of Artificial Intelligence,    Edinburgh University
5 Forrest Hill, Edinburgh, EH1 2QL, UK                DoD #205
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: Re: Motorola 800 number wanted
Date: 13 Aug 92 14:14:18 GMT
Reply-To: michael@vk2bea.UUCP (Michael G. Katzmann)
Organization: Broadcast Sports Technology, Crofton. Maryland.


Its: 1-800-521-6274  (The "we're on your design team" number)
-- 
Michael Katzmann	  >	Broadcast Sports Technology Inc.
~~~~~~~~~~~~~~~~	 <	Crofton, Maryland. U.S.A
Amateur Radio Stations:   >
NV3Z / VK2BEA / G4NYV	 <	opel!vk2bea!michael@uunet.uu.net
From: jpt@uh.msc.edu (Joseph Thomas)
Newsgroups: sci.electronics
Subject: Databooks for Intel 80960CA
Date: 19 Aug 92 23:37:50 GMT
Distribution: usa
Organization: Minnesota Supercomputer Center, Minneapolis, MN


	I'm looking for databooks, both hardware and software, for
the Intel 80960CA. I've talked to the Intel lit. people who claim
to have nothing on the CA - but I think this chip has been out since
'89 or '90. Anyways, I've got their glossy's on the 960 family. What
I need are pointers to sources for the CA family. As an aside, except
for the KB which has a FPU, is the instruction set the same for the
S?/K?/C? family ?? Thanks for any pointers.

Joseph Thomas                           E/Mail:  jpt@msc.edu
Minnesota Supercomputer Center          AT&T:    +1 612 626 0286
Minneapolis, MN                         FAX:     +1 612 624 6550
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Thu, 13 Aug 1992 20:17:08 GMT
Subject: Re: Are there 50Mhz RF Amplifiers available?
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> Uhhhhhhhhhhhhhhh............
> 
> Would you like to tell me where you found that 2000 watts is LEGAL on 6
> Meters?????????????????  I mean, I Know 6 Meter Propagation Sucks right
> now, but we hafta stay LEGAL, Right?????????????
> 
>         .....Phantom (KB5OWZ Tech+)

So who said anything about 2 kW?


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.
From: jorgense@plains.NoDak.edu (Lee A. Jorgensen)
Newsgroups: sci.electronics
Subject: EGA Monitor to use a VGA Card --- HELP.
Date: 18 Aug 92 04:26:13 GMT
Article-I.D.: plains.19767
Organization: North Dakota Higher Education Computing Network

I purchased a nice Trident Impact 3 SVGA card with 1MB of ram, but don't
currently have the funds to purchase a nice monitor.  I would like to use the
card though.  How can I interface my monitor with my card?

My monitor is a Packard Bell EGA - 9pin
Trident SVGA card - 15pin

Thank you.

-Lee.

-- 
Lee Jorgensen             Internet: jorgense@plains.NoDak.edu
-------------------------------------------------------------
   Sorry, but the rest of this .signature is out of order.
               Sorry for the inconvenience.
Newsgroups: sci.electronics
From: barkman@gamma.is.tcu.edu (MYLES BARKMAN - KG5AI TX A&M U)
Subject: Green screen - sometimes: addendum
News-Software: VAX/VMS VNEWS 1.41    
Organization: Texas Christian University
Date: Thu, 13 Aug 1992 20:35:00 GMT

The problem to the point.  I have a 19" Quasar made in May '83.  Due to a
very strong electrical shock, the screen flickers to a green color which
lasts usually less than a second but sometimes lasts several seconds.  This
happens maybe 5 times/day.  Been serviced once and supposedly fixed, only
to find the problem creep back after while.  When the screen goes green, there
are some diagonal lines on the screen as well (not a pure green display).
There is, in fact, a service/normal adjustment accessible from the back.
I've had a reply stating that it is possibly kicking in momentarily at random.
Anyone else with some ideas/advice?
-----------------------------------------------------------------------------
Myles Barkman                                                Fort Worth TX
KG5AI
BARKMAN@TCUCVMS                If an upside-down 'e' is a schwa,
BARKMAN@GAMMA.IS.TCU.EDU       what is an upside-down 'o' called?
CCVAX3::BARKMAN
-----------------------------------------------------------------------------
Newsgroups: sci.electronics