HDTenEightyP/NetNews huggingface dataset:
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: chaser lights
Organization: Motorola Computer Group, Tempe, Az.
Distribution: usa
Date: Wed, 4 Nov 1992 14:47:52 GMT

In article <lf5mpgINN9s9@appserv.Eng.Sun.COM> bender@oobleck.eng.sun.com writes:
>schuch@phx.mcd.mot.com (John Schuch) writes:
>: In article <1992Oct22.143703.6299@sactoh0.sac.ca.us> jhp@sactoh0.sac.ca.us (Jim H. Puga) writes:
>: >I understand I missed an article about how to build chaser lights.
>: 
>: Build an oscillator with an LM555, connect to output to a 7493
>: TTL binary counter, connect the BCD output to a 74154 TTL BCD to
>: 1 of 16 decoder, connect the outputs of the 74154 to solid state
>: relays starting with output 1, connect the first unused output
>: from the 74154 to the reset input of the 7493.
>
>--> John Schuch at Motorola Computer Group, Tempe, Az.
>		   ^^^^^^^^^^^^^^^^^^^^^^^
>
>John, I'm surprised that you didn't suggest using one of Mot's great
>microcontrollers.  Jim would have had a simpler hardware solution (XTAL,
>uC, SS relays) as well as learned how to program one of your 68XX family.
>mike

Well, meaning no offense to the original poster, I presumed that if one
was asking how to build a chase light system, one probably is not ready
for a dedicated microcontroller hardware/software project which would
require a pretty broad range of disciplines. The TTL based circuit I
mentioned is straight-forward in design, easy to understand, hard to
screw up, and is one of the first things I ever built (many moons ago).

BUT! since you asked....   :-)

Any of the 68705 parts would do a great job. You could use the A/D
inputs to build a color organ / chase light; you could use all of\
the excess I/O to turn it on at dusk, off at dawn, lots of options
here. The serial port would allow remote control from a PC, or report
lamp failure back to the PC ( using the A/D to measure the current
through the light strings ). With all of the excess processing
capacity left over, might as well hang a tone generator off one
of the ports and play Christmas Carols.

Then again, the TTL circuit costs about $5.00, and can be built in
a few hours by a newcommer to the field.

John




Newsgroups: sci.electronics
From: hale@btree.uucp (Bob Hale)
Date: Thu, 5 Nov 92 20:08:25 GMT
Organization: Brooktree Corporation
Subject: Re: Computer monitor resolution question
Summary: 
Followup-To: 
Distribution: na
Organization: Brooktree Corporation, San Diego
Keywords: 

In article <IISAKKIL.92Oct28153408@lk-hp-1.hut.fi> iisakkil@snakemail.hut.fi (Mika Iisakkila) writes:
>No. The raster mask is physically behind the phosphor dots, spaced
>some millimeters(?) away. It is carefully aligned at the factory to
>let the beam from one electron gun to only land on phosphor dots of
>this particular colour.

Actually, the phosphors are aligned to the mask.

>                         There is no way you can get the beam from the
>red gun to land on green phospor (for example) without physically
>damaging the tube so that the mask is displaced. You must have had bad
>luck to only come across colour monitors with no v-size controls.

Have you heard of the purity adjustment?  That's the one that assures
that the red beam only illuminates the red phosphors, the green beam
only illuminates the green phosphors, and the blue beam only illuminates
the blue phosphors.

Bob Hale                                      ...!ucsd!btree!hale
...!btree!hale@ucsd.edu                       ...!ucsd!btree!hale@uunet.uu.net
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: 12 v -> 3v, 0.6 a
Date: 13 Nov 92 00:54:42 GMT
Article-I.D.: u.1992Nov13.005442.11157
Organization: University of Washington, Seattle

In article <1992Nov12.083015.16121@bernina.ethz.ch> schaerer@isi.ethz.ch (Thomas Schaerer) writes:

>If you generate a stabilized voltage with a linear-mode- or switched-
>mode-power-supply you are never shure if the circuit goes damaged in
>worst case. About this you must think, because a CD-Player is an
>expensive device. You shold save your CD-Player with an additional
>power-zener of about 3.6V and a fast-fuse in serie of it.

	The zener might be a good idea, but the fuse isn't.  The
LM317 is internally limited, it NEVER will blow that fuse.
The LM317M would be internally limited at circa 750 mA, and
would be more dependable than most fuses (as well as faster
acting).  

	If the application needs more than 500 mA (measured),
use an LM317; if it needs less, the LM317M or LM317H will do.
The original post mentioned 600 mA, but that could have been a 
maximum, not an average current draw.

	John Whitmore
From: johne@PROBLEM_WITH_INEWS_GATEWAY_FILE (John Eaton)
Newsgroups: sci.electronics
Subject: Re: Disk drive fails when pc card plugged, why?
Date: 12 Nov 92 18:13:54 GMT
Article-I.D.: vcd.BxM7z6.1LD
Distribution: usa
Organization: Hewlett-Packard VCD
X-Newsreader: Tin 1.1 PL5

Vincent Wass (vwass@sdcc13.ucsd.edu) wrote:
: I am having trouble with a computer interface project.  I'm trying
: to decode addresses on the bus for my own plug-in wire-wrap card.
: 
: My only problem seems to be that while the card is plugged
: in, both of my disk drives (5 1/4, and 3 1/2) have some sort of
: problem copying files to my hard drive.  When I type chkdsk at the
: 
: 
--------------------------
The Pc Bus has a signal called <something like> CPUAEN that tells you if
it is a CPU cycle or a DMA cycle. All IO devices must include this signal 
in their decoding and not respond unless it is a CPU cycle.

Whats happening is that the system is doing a disk read into memory that
has the same address as your IO card. Your card sees the proper address 
and the IORead strobe intended for the disk controller and promptly
blows away the data on the data buss.

John Eaton
!hp-vcd!johne
Newsgroups: sci.electronics
From: peny@ppc.lpc.ethz.ch (Peter Nyffeler ,x4399)
Subject: Re: P.S. to Creating sci.semiconductors
Reply-To: peny@ppc.lpc.ethz.ch
Organization: ETH-Zuerich, Physical-Chemistry-Lab. - Switzerland
Date: Tue, 10 Nov 1992 08:47:33 GMT

In article 721328279@class1.iastate.edu, sehari@iastate.edu (Babak Sehari) writes:
>----
>Due to the fact that articles about the world of solid state and 
>semiconductors gets lost in between the other physics and electronics
>news, I suggest a new network wild newsgroup to be created as
>sci.semiconductors&quantum_electronics.
>
>Anybody has any comments or knows how to go about creating this news group?
>
>                       With highest regards,
>                            Babak   Sehari.
>-- 

Sorry for my sugestion.
I think what you would like, is a newsgroup about semiconductor theory or production?

If you want this, the newsgroup should be called sci.quatum_electronics. 
Otherwise there will be questions like, where to get a spezial IC, its fuction or 
pin asignment.

Peter Nyffeler

Newsgroups: sci.electronics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: Connecting TV screen to computer
Originator: sehari@class1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Mon, 9 Nov 1992 04:02:15 GMT

In <1992Nov8.122328.44521@kuhub.cc.ukans.edu> christos@kuhub.cc.ukans.edu writes:

>HEllo there,

>	I am interested in connecting my TV screen to the computer and replace
>it with my monitor. Is that possible? I have seen people doing it but what are
>the precautions that need to be taken into account so that I won't blow up
>anything and how can I really do this? Where can I get inforamtion about it?

>	I would apprecoiate any relevant response.

>Thanks,
>Chris.
>Internet Address: christos@kuhub.cc.ukans.edu


TENEX has a card that does that and much more, you could even edit
the TV Program, capture frames into disk, or make it come out of a windows
window in the corner of your monitor. This allows you to work at something
else and watch TV at the same time.  Their Phone # 1-800-776-6781.

                         With highest regards,
                              Babak   Sehari.
-- 
Newsgroups: sci.electronics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: 12 V -> 3V, 0.6 A
Originator: sehari@class1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Mon, 9 Nov 1992 16:19:34 GMT

In <1992Nov9.114833.26094@bernina.ethz.ch> schaerer@isi.ethz.ch (Thomas Schaerer) writes:

>Babak Sehari (sehari@iastate.edu) wrote:
>: 
>: There are many ways to do this the cheapest way is to put:
                                      ^^^^^^^^^

>Sorry but all this is nonsense bcause of the high current. If you realise
>a linear regulator you will generate very high lostpower. In this example
>will be 0.6A * 9V = 5.4W. The better way is to build a switched regulator.
>The advandage is the high efficiency ang therefore less powerdissipation.
>There are many ic which can do this with a few additional components. 
>Take the Switching-Regulator L296 from SGS-THOMSON. There is a kit with
>pcb-board and the needed components. Ask a SGS-THOMSON-Distributor.

>So I hope I can help you.	Greeting from Thomas

You can spend 1000s of $s on a voltage transformer to make it as efficient as
possible.  However, 5.4W in a car is not really that important.  You
lose much more, just by not having a new battery in your car, or just
by turning on your lights.  Here, the question is Engineering compromise.

I guess you could use gold wire to wire up your car, too! -:) Even though,
it has less resistance than regular wire;  the costs does not justify the
savings in this case.

However, If you want to do this most efficient way, you should change it
to AC, using a Class B Amp, then send it through step down transformer
, with super conducting wires a ferrite core -:), than convert it back
to DC.  The efficiency would be %85*%98*%85=%70.  That is 0.7W Vs. 5.4W
loss.  However, it costs more than $500 Vs. $5 of my design.  This does not 
justify 4.7W power saving in a car, which more power is consumed for 
ornamental reasons.  For example an extra stop light consumes 30W alone. -:)

                             With highest regards,
                                  Babak   Sehari.
--
From: mh001b@uhura.cc.rochester.edu (Matthew W. Hacker)
Newsgroups: sci.electronics
Subject: Heat conduction vs. electron conduction?
Date: 10 Nov 92 18:02:23 GMT
Article-I.D.: galileo.1992Nov10.180223.25291
Organization: University of Rochester - Rochester, New York


Are there any substances that conduct electricity well, but
conduct heat poorly?  This sort of material would be pretty
well suited to thermacouple (Sp?) design...

 

-- 
Matthew W. Hacker                           mh001b@uhura.cc.rochester.edu
                                            AppleII forever!
Newsgroups: sci.electronics
From: barriga@bvd.jpl.nasa.gov (Pablo Picasso)
Subject: Echo cancellation
Organization: Jet Propulsion Laboratory
Date: Thu, 5 Nov 1992 21:29:51 GMT

Ok, here's the situation.  I have a telephone interface circuit that does
dialing, ring detect, on hook/off hook and a few other things.  This circuit
has a 2 to 4 wire hybrid for the direct interface to the PSTN (or PBX), and
it is this hybrid that is the source of my problem.  Seperate transmit and
receive lines serve as input and output respectively on one side of the 
hybrid circuit, and the other side (PSTN side) is a single line carrying 
both transmit and receive signals.  The hybrid has a natural property that 
returns the single transmit line signal with a slightly lower amplitude and 
a small phase shift on the receive line.  I think it does this to provide
sidetone on a telephone handset.  Does anyone know of a way to suppress or
better yet, completely cancel this receive signal without affecting the 
receive signal from the PSTN line?  Please tell me if my question needs
clarification.  Thanks.

barriga@bvd.jpl.nasa.gov
Newsgroups: sci.electronics
From: srfergu@rufus.erenj.com (Scott Ferguson)
Subject: Cable TV Channel Frequencies
Organization: Exxon Research & Engineering Co.
Distribution: usa
Date: Mon, 9 Nov 1992 14:35:48 GMT

Where's a good publication to find the center frequencies of Cable
TV Channels?

Thanks.

-- 
----------------------------------------------------------------------
Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      New Jersey
----------------------------------------------------------------------
"Always bark at a dog."
From: langston@memstvx1.memst.edu (Mark C. Langston)
Newsgroups: sci.electronics
Subject: Pinouts for Princeton Ultrasync monitor?
Date: 9 Nov 92 17:36:21 GMT
Article-I.D.: memstvx1.1992Nov9.233621.4021
Distribution: world
Organization: Memphis State University


  Does anyone out there have the pinouts for a Princeton Graphics Systems
Ultrasync multisync monitor,,
fcc id ehj4repsc28a?  From what I hear, they've gone under, and I think I need
to reconfigure the monitor cable I use (I bought it used and got no manual...)

thanks,



-- 
+--------8<------Cut Here------8<------Cut Here------8<------Cut Here---------+
  Mark C. Langston   |  "Secrecy is the beginning of tyranny."                 
  Psychology Dept.   |  "Always listen to experts.  They'll tell you what can't
  Memphis State U.   |     be done, and why.  Then do it."                      
      "Pftph!"       |           -From the notebooks of Lazarus Long
From: bomr@erich.triumf.ca (Rod Nussbaumer)
Newsgroups: sci.electronics
Subject: Re: Filtor Design Software
Date: 6 Nov 1992 07:25 PST
Organization: TRIUMF: Tri-University Meson Facility
Distribution: world
NNTP-Posting-Host: erich.triumf.ca
News-Software: VAX/VMS VNEWS 1.41    

In article <Bx94or.GH2@ecf.toronto.edu>, cces@ecf.toronto.edu (Congress of Can Eng Students) writes...
>Does anyone know if there is a public domain (or relatively cheap) software
>package (for a PC) that aids in the design of filters?
> 
>Something that allows the plotting of characteristic functions and attenuation
>plots, as well as filter optimization and the such.  Also, being able to 
>specify the passbands/stopbands, and the filter order and having the program
>find a best approximation of the system would be a great asset.
> 
>Thanks for your time...
>/ Brian Campanotti       |                          |"Got a mortgage on my    \ 

	You didn't specify whether you wanted to design digital (software)
	or analog (hardware) filters, but if you meant digital...

	I have used the book "C Language Algorithms for Digital Signal
	Processing"; Embree et al, Prentice Hall.  There is a disk with
	all the source included right in the book.  It worked well for me.
	Not exactly public domain, but reasonably priced, all things 
	considered.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Rod Nussbaumer, Programmer/Technologist       Bitnet: BOMR@TRIUMFER
  TRIUMF --- University of British Columbia,  Internet: bomr@erich.triumf.ca
  Vancouver, BC, Canada.                         Phone: (604)222-1047 ext 510
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Newsgroups: sci.electronics
From: markl@research.nj.nec.com (Mark Lee)
Subject: Anyone know a good PLL?
Originator: markl@research.nj.nec.com
Organization: NEC Research Institute
Distribution: usa
Date: Mon, 9 Nov 92 20:18:21 GMT

I am looking for a Phase-Locked Loop, either a bench instrument or an
integrated circuit.  I need to detect an FM signal with center frequency
of roughly 10 kHz and bandwidth of 1 kHz maximum.  It would be nice if
the voltage-controlled oscillator could be externally controlled too.

I'd appreciate email about vendors/product numbers you might know.

Thanks,
Mark
markl@research.nec.com

Newsgroups: sci.electronics,rec.video
From: collins_w@cubldr.colorado.edu
Subject: GARY COFFMAN
Organization: University of Colorado, Boulder
Distribution: usa
Date: Fri, 6 Nov 1992 15:12:29 GMT

Gary Coffman,
   I tried to reply to one of your posts, but the email kept bouncing.
I also tried it from VMS Mail with no luck. Please send me a better
path. Thanks.


-------------------------------------------------------------------------------
|				  Neil Collins				      |
| For email responses, please say the mail is "For Neil" on the subject line. |
-------------------------------------------------------------------------------
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Crystal-controlled FM XMTR?
Organization: AI Programs, University of Georgia, Athens
Date: Mon, 9 Nov 1992 03:31:36 GMT

In article <1992Nov6.204019.6938@news.nd.edu> fdeck@dumpster.helios.nd.edu (francis deck) writes:
>I've seen talk about one-chip FM transmitter circuits, but it
>appears they are all slug-tuned and experience frequency drift.
>Is there a simple circuit out there which is a monaural or
>stereo (doesn't matter for my application) FM transmitter,
>but which has a crystal timebase?  I'd imagine it'd use some
>sort of PLL, but at 89 to 108 MHz, I'm lost.  Any help?

Hmmm, there isn't, but there should be.  It's easy to "pull" a crystal
by using a (modulated) variable capacitance across it.  To get enough
deviation to be audible on an ordinary FM radio, you'd probably want to
use a crystal at perhaps 1/27 the eventual frequency, and then triple
it several times (thereby also tripling the deviation).

See the Radio Socy. of Great Britain VHF/UHF HANDBOOK.

-- 
:-  Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:-  Artificial Intelligence Programs       phone 706 542-0358
:-  The University of Georgia                fax 706 542-0349
:-  Athens, Georgia 30602-7415 U.S.A.     amateur radio N4TMI
Organization: The American University - University Computing Center
Date: Thu, 5 Nov 1992 23:27:39 EST
From: <ZHAO@auvm.american.edu>
Newsgroups: sci.electronics
Subject: Need:FTP site for cross-reference ?


It would be great if anyone there can share the information about
where we can download the cross-reference database for IC and
semiconductors.  I guess those giant electronics companies may
have this kind of information. But where are them ?

Please post to this group. It will be everyone's treasure.

Thanks.
Newsgroups: sci.electronics
From: johnh@macadam.mpce.mq.edu.au (John Haddy)
Subject: Re: Motorola S19 ==> S2 record. How?
Organization: Macquarie University, Sydney
Date: Fri, 13 Nov 1992 03:38:01 GMT

As far as I can determine, your programmer will probably work.

S19 file describes a file which may contain S0,S1 and S9 records. An S0 record is
an optional header record which may contain the file name, etc (i.e. used only to
aid humans in identifying the file. Data is contained in S1 records, whereas an
S9 record denotes the end of file.

The syntax of an S record is:

	`S' T LL AA ... AA DD ... DD CC


where:	S	indicates start of record
	T	record type identifier
		0 = header
		1 = 16 bit address data record
		2 = 24 bit address data record
		3 = 32 bit address data record
		7 = (possibly) 32 bit address end of file record
		8 = (possibly) 24 bit address end of file record
		9 = end of file record (maybe only for 16 bit address)
	LL	number of bytes in record
	AA	contains 4, 6 or 8 hex digits (depending on record type)
		representing the memory address where the first byte of
		data in this record is located.
	DD	data field hex digits, two per byte, consistent with the LL
		length parameter.
	CC	a two digit checksum field, calculated by one's complementing
		the sum (modulo 256) of the byte count, the address field and
		the data field.

Although this is supposition (my sources don't make this extremely clear), I
believe that S19 is a shorthand description of a file containing S1 and S9
records, similarly for S28 (S2, S8) and S37 (S3,S7) files.


Hope this helps

	JohnH

references:

James M. Sibigtroth	"Understanding Small Microcontrollers"
		Motorola CSIC Microcontroller Division
	(a text book supplied with the M68HC05KICS evaluation kit)

Logical Devices, Inc	Allpro-88 User's Guide
	(user's manual for our universal device programmer)

----------------------------------------------------------------------------

      |  _  |_   _   |_|  _   _|  _|              Electronics Department
    |_| (_) | | | |  | | (_| (_| (_| \/           School of MPCE
    ---------------------------------/-           Macquarie University
                                                  Sydney, AUSTRALIA 2109

    Email: johnh@mpce.mq.edu.au, Ph: +61 2 805 8959, Fax: +61 2 805 8983

----------------------------------------------------------------------------
From: cam@castle.ed.ac.uk (Chris Malcolm)
Newsgroups: sci.electronics
Subject: UNDERPOWERED HALOGEN LAMPS
Date: 6 Nov 92 12:22:33 GMT
Organization: Edinburgh University

I have read that running halogen lamps on reduced voltage will shorten
their life, the argument being that their life depends on a cycle of
tungsten sublimation and redeposition which requires a certain
temperature to work. However, it seems to me that at lower
temperatures where it doesn't work (so well) it is not needed, i.e.,
tungsten/halogens should have the same kind of life/voltage graph as
ordinary vacuum tungstens.

Can someone who knows confirm or deny this?
-- 
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: msunde01@mik.uky.edu (Mark  Underwood)
Newsgroups: sci.electronics
Subject: Re: Communication on power line
Date: 5 Nov 92 05:37:13 GMT
Reply-To: msunde01@mik.uky.edu
Distribution: usa
Organization: University Of Kentucky, Dept. of Math Sciences

In article <1992Nov3.224824.16433@newsgate.sps.mot.com>  
markm@bigfoot.sps.mot.com (Mark Monninger) writes:
> In article <1992Nov3.172545.1@npe.isnet.inmos.co.uk>  writes:
> > ... 
> > A few years ago a UK electronics hobby magazine (Practical  
Electronics)
> > published details of an intercom that used the (240V UK) mains as the
> > communication medium. I think it was published around about 1982 or  
> 1983.
> >  ...
> You can (or at least could at one time) buy an intercom system like this  
> at Radio Shack (Tandy in the U.K.). I have one that I bought in Scotland  
> but the same model was available in the U.S.
> 
> Mark


    As a matter of fact you CAN still buy this sort of intercom system  
from R-S dirt cheap.  We bought one a few years ago for my ailing  
grandmother who lives with us (other end of house) and I am certain I saw  
the same model in their '92 catalog. . ..


--
			By your leave,
			
				Mark S. Underwood
				EE Stduent, Univ. of Kentucky
				msunde01@mik.uky.edu
				
Newsgroups: sci.electronics
From: ch@eiaut2.tuwien.ac.at (Christian Kral)
Subject: Re: Phone line monitor
Organization: Technical University Vienna, AUSTRIA
Date: Wed, 11 Nov 1992 13:01:57 GMT

In article <27344@oasys.dt.navy.mil>, curt@oasys.dt.navy.mil (Curt
Welch) writes:
|> In sci.electronics, kharstin@MtHolyoke.edu (Ken Harstine) writes:
|> >I would not recommend that you tie any portion of
|> >this circuit to ground, as this would unbalance the phone line, and
|> might
|> >cause distortion of the sound.
|> 
|> This reminds me of a problem I had.  I tried to use an oscilloscope
|> once
|> to look at a phone line and some phone interface circuits I was
|> playing
|> with.  Hooking up the scope caused a large hum to be introduced in
|> the
|> circuit, which prevented me from making any useful measurements.
|> 
|> So, my question.  How do I use a scope to look at a phone line?  Do I
|> need
|> an isolation transformer between the power and wall outlet?  Or is
|> there
|> some type of probe I could buy that would provide the needed
|> isolation?
|> 
|> Curt Welch

Hi Curt,

There is a simple possibillity of getting rid of this kind of problems,
using a two channel scope which can add both inputs and invert one. 
If you hook up both probes to the two telefone lines, leaving the
GND-connectors of the probes away, you can measure simply the
differencial signal which is just what you want, regardless of the
common voltage.

Try it,

Christian.