HDTenEightyP/NetNews huggingface dataset:
From: vnelson@ccu.umanitoba.ca (Gerald Vernon Nelson)
Subject: Re: Need advice on PCB packages for PC
Organization: University of Manitoba, Winnipeg, Canada
Date: Wed, 7 Oct 1992 02:48:14 GMT

In <1992Oct5.150357.17668@kakwa.ucs.ualberta.ca> kim@ee.ualberta.ca (Kim Adams) writes:

>Hi!

>We would like to purchase packages for schematic diagrams and PC 
>board layouts.

>We have a 486 with OS/2, $2500 Canadian. Windows is coming soon.

>Autorouting would be nice, but, could do without it.  For now all we
>need is for the two programs to talk to each other and have an easy user
>interface.

>Thanks in advance for your advice on the best bang for the buck.

We use EE designer at our electronics design and manufacturing company
in Winnipeg, Manitoba.

The package comes with a schematic capture section which allows the user
to input the schematic.  Front anotation is performed and the parts 
appear when the layout section is entered.

Back annotation is also posssible.  Parts can be added to the layout,
when you return to the schematic routine, they appear to be placed.
When you click on a pin, it highlights the pins it connects to.
This makes place and routing a fairly straight forward task.

Autoplace and autoroute are available, but generally not recommended.
The autoroute program will split the component side and 
solder side into vertical and horizontal traces.  In order to 
go down an inch, over 1/2 inch and back up, the program will create 2 vias
to go over the 1/2 inch, even if nothing is in the way.  Logic simulation
and thermal analysis are options.

EE designer packages range from $1500 to $6000 depending on options.
I believe the schematic and layout programs are around $1500.

According to our resident expert, EE designer is considerably faster at
redrawing than Autocad.  The most complex board we have
ever built using EE designer is  about 800 parts, through hole and SMT.

The package is fairly easy to use.  BUT, like any PCB design package,
there is lots to learn.  You have to learn to edit devices, symbols etc.
A library of components has to be maintained. This can become a large
task if you have any variety of parts.


Vern Nelson
Newsgroups: sci.electronics
From: JLEHTIMAKI@finabo.abo.fi (Janne Lehtim{ki PAP)
Subject: Re: How to open Interplex electric toothbrush ?
Organization: Abo Akademi University, Finland
Date: Thu, 1 Oct 1992 09:48:04 GMT
X-News-Reader: VMS NEWS 1.23

In <92274.141813ZHAO@auvm.american.edu> ZHAO@auvm.american.edu writes:

> Does anyone know how to open InterPlex electric toothbrush ? The one
> I used for one and half years quit working. There is no screw at all.
>     Thanks in advance.


Interplex is an unknown brand for me, but some brands available here in
europe uses a temperature sensitive glue. Put your toothbrush in
heated water (somewhere around 65 degrees Centigrade) for a while
and try to open it by just pulling the parts apart.


				I hope this helps
                                                 Janne

 Janne S. Lehtimaki
 Abo Akademi University              phone : int. +358 21 65*4311  ext. 4625 
 Department of Paper Chemistry       fax   : int. +358 21 516757             
 Porthaninkatu 3                     telex : 62 301 aabib sf                 
 SF-20500 TURKU - FINLAND            e-mail: jlehtimaki@abo.fi (Internet)    
Newsgroups: sci.electronics
From: james@skatter.usask.ca
Subject: Re: signal generator CD
Organization: University of Saskatchewan
Date: Tue, 6 Oct 1992 16:42:20 GMT

From article <1193@alsys1.aecom.yu.edu>, by reiner@medusa.bioc.aecom.yu.edu (Peter D. Reiner):
> Is there a CD with different-frequency sine waves on the various cuts?
> I'd like a signal generator but don't want to spend the money!
> 
> -Peter Reiner
 
 I have a test disc at home, with some sine waves, pink & white noise, square
waves, and some really strange computer generated music. I think the disc
was made at Stanford University. The disc is called the Digital Domain.
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: ARchive server for Parts
Organization: SSC, Inc.,  Seattle, WA
Date: Sun, 04 Oct 1992 03:31:54 GMT
X-Newsreader: Tin 1.1 PL3

cyberman@toz.buffalo.ny.us (Cyberman) writes:
: You know what would be nice is an ARchive server for parts
: information, 
: ...
:     1:  Does this exist?

At one time, there was a service called VideoLog that was
piggybacked on one of the commercial services. (Compu$erve?).
There are also CD Rom systems if you have a couple of kilobucks.

:     2:  If not WHY doesn't it!
: 
: You would think that chip manuafacturers could increase sales if
: poeple could request information on thier products instantly or
: at least VERY rapidly.

In case you've missed the trend in the past decade or so, towards
"Closer Customer Relationships", "Just in Time", and the rest of that
package,  "They" don't want a lot of little customers, just big
ones.  The money for sales support is going to go to the the things
that make money.  And if this means ignoring a lot of small customers 
in favor of a few big ones, well ...

Maybe they figure that if you don't have a couple of kilobucks to
buy the CD Rom system, you aren't going to spend enough to be worth
their while.

Mark Zenier  markz@ssc.wa.com
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: Multi-flash synchro fire by wire/slaves
Date: 01 Oct 92  16:41:04 CST

 > Subject: Multi-flash synchro fire by wire/slaves
 > Organization: Tampere University of Technology
 > Message-ID: <1992Sep29.154353.26515@funet.fi>
 > Date: 29 Sep 92 15:43:53 GMT


 > Subject: Multi-flash-synchronizing by wire/optical ways

 > Do you know good solution to fire 2-4 flashes (metric Guide Numbers
 > for each about 25-50) by wire or slave sensors:

 > 1.   By wire: Isolation of flash circuits, triggering.
    Which thyristor type to use, what would be good
    triggering circuitry. Pointers to schematics,
    PCB kits etc.
 > 2.   By slave sensors: Pointers to building kits or
    schematics.

Check out E&TT January 1988; Wireless Photoflash Trigger.

-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
Newsgroups: sci.electronics
From: tidedu@mars.lerc.nasa.gov (William T. Dedula)
Subject: Sources for Robotics Systems, Kits, Components, and info.
News-Software: VAX/VMS VNEWS 1.41    
Organization: NASA Lewis Research Center
Distribution: usa
Date: 26 Sep 1992 13:44 EDT  

Hello All;
I am a member of a group who is coordinating a Robotics
Contest for area High School students. Students will build
minerature Robotics Rovers which will run on a section of
terrain (designed by middle school students) which simulates the
surface of Mars. The idea of this project is to design a Mars Rover
which will explore Mars just as NASA is doing. Points will be awarded to
the rovers which make it through the course in the specified time limit 
as well as the rovers which are the lightest weight, and lowest cost.

I am currently seeking as many sources of Robotics Material as I
can to provide these students with as many resources as possible
as they build their Robotics Systems. Primarily, I'm looking for
mail order corporations, institutions, or individuals who can
provide the following ...

1) A source for Minerature TV camera's as well as Minerature
   video transmitters which operate at low power, utilize low
   voltage (So they'll operate on the rover's batteries), and are
   fairly cheap. Also ... they should not require any special
   licence or permission to operate. I have checked into Amateur 
   TV (ATV) systems and though they meet most of our criteria, they
   do require a Amateur Radio Licence to operate. 

2) A good source for Robotics Kits (Particularly Robotics Rovers
   or cars).

3) A good source for Robotics components such as stepper motors,
   switches, sensors, Motor's, and other electronics and/or
   mechanical equipment.

4) A good source for Robotics plans, books, circuits, etc. I've already
   checked Tab Books and they have quite a few interesting ones. 

5) A source for anything else relating to Robotics which you think
   will benefit this project.

The many students who take part in this exciting project as well
as myself and the other robotics contest coordinators at the
Lewis Research Center and Ohio Aerospace Institute will be very,
very appreciative of any assistance you can give us with the above
information.

Tim

P.S. Please provide phone numbers and address of the above sources
if you know them. Thanks again !!!

W. Tim Dedula                        Internet: 
N.A.S.A. Lewis Research Center       tdedula@nasamail.nasa.gov
Mail Stop 77-3                       tidedu@mars.lerc.nasa.gov
21000 BrookPark Road                 aa252@cleveland.freenet.edu
Cleveland, Ohio 44135
Phone (216) 433-3668

The National Aeronautics and Space Administration: Science and
Technology ... for the Benefit of ALL Mankind !!!
From: Edward.D..Gogel@mailbox.bison.mb.ca (Edward D. Gogel)
Newsgroups: sci.electronics
Subject: Super Nintendo Pin-Outs
Date: 24 Sep 92 22:25:15 CST

Organization: Rensselaer Polytechnic Institute, Troy, NY.
Reply-To: gogele@rpi.edu

I was wondering if anyone knew what the pin-out are on the flat edge connector
on the back side of the Super Nintendo... I saw that there was a super-vhs
cable in the store... Does anyone know how this cable is constructed, or
if it is possible to connect the game unit to a NEC Multisync 5FG monitor??

Any information would be appreciated...

Mail gogele@rpi.edu....

Thanks in advance!


Ed Gogel

 * Origin: The Electronic Mailbox (1:348/7.0)
From: pyrdek@edinboro.edu
Newsgroups: sci.electronics
Subject: Re: How does stereo FM radio work?
Date: 29 Sep 92 13:13:34 GMT
Distribution: na
Organization: Edinboro University of Pennsylvania

> 
> 1. To transmit stereo FM signals first they add the left channel (L) to the
> Right channel (R) Then they subtract L-R then they transmit the addition of
> two signal (L+R) after passing through 18KHz low pass filter using regular
> FM transmite. This way every body can receive the "L+R signal", then add
> 18KHz to the L-R signal and send it through the same channel. Now, all the
> receivers that have stereo capability isolate this signal first, subtract
> 18Khz from it then add and subtract it from L+R signal:
> 
> (L+R)+(L-R)=2L
> (L+R)-(L-R)=2R
> 
> 2.  As you can see, sending the signal this way needs large band width and
> AM by FCC regulation only permit less than 10KHz band width.  There is
> not enough space for the signal itself, let alone pigibacking another
> signal to it  Off course, these days using digital technology you might
> compress the signal before sending and do a lot of other things to it.
> Therefore, it might be possible to this today if everybody agree on the
> same procedure.  Today, we have motorola standard, RCA standard  etc...
> 
>                   With highest regards,
>                        Babak   Sehari.

MALE BOVINE ORGANIC BIOLOGICAL ROUGHAGE!!!!!


You seem to ignore the 38Khz double sideband suppresed carrier portion
of the the signal (which actually carries the L-R signal).  You have
a total misunderstanding of the 19.000 KHz stereo pilot signal which
is uused solely to phase lock the oscillator used to demodulate the
38 KHz  DSSC L-R signal and incidentaly to light the little stereo lamp 
and activate auto-mode select in recivers so equipped.

You ignore the fact that the bandwidth usedby the carrier is 
exactly the same for FM mono or stereo (+/- 75 Khz of carrier). 
You ignore that the AM DSSC is used to modulate the
FM carrier in exactly the same way (ignoring pre-emphasis) as the
L+R main channel audio.  Aside from that, you ignore that AM stereo
generally uses variations of phase modulation to transmit the 
required audio difference signal(s), and the political reality
that AM stereo was stiffled tremendously by the FCC unwillingness
to make a decision on ONE standard for AM stereo transmission.

The FCC instead took the cowards way out and decided to "LET THE
MARKET PLACE DECIDE!"  This gave receiver manufacturers no sense
of direction as to where to spend their limited research and
development time and dollars since no one wants to put money into
something that MIGHT only get 1/4 of the market, IF that.

With slow receiver penetration, transmitter conversion/replacement
was also slow for the same reasons.

The slowness of AM stereo to penetrate the market has nothing
nowadays to do with technical standards, only financial and
political realities.

Joe Pyrdek
Edinboro Univ.
Edinboro PA
Newsgroups: sci.electronics
From: gould@waterloo.hp.com (Dan Gould)
Subject: Looking for FM Rebroadcaster
Date: Fri, 2 Oct 1992 16:32:18 GMT
Organization: HP Panacom Div Waterloo ON Canada
X-Newsreader: TIN [version 1.1.4 PL6]


I am looking for an FM rebroadcaster. The idea is that I will connect the
output of my stereo system to the unit, so that the kids can listen to their
CD's and mucic videos on headphones via their portable FM radios.

The transmission range need be only 50 feet or so, but the quality needs
to be compatible with CD quality.

Thanks in advance for any ideas on where I can purchase such a unit.

--
Dan Gould
gould@arris.on.ca
Newsgroups: sci.electronics
From: dbowman@shade (Don A. Bowman)
Subject: Re: Information wanted about Pal/Gal/? PC-type development systems.
Organization: University of Waterloo
X-Newsreader: TIN [version 1.1 PL6]
Date: Tue, 29 Sep 1992 16:18:59 GMT

Wayne Smith (wlsmith@valve.heart.rri.uwo.ca) wrote:
: [Wants info on Gals]
: 

I have used CUPL from logical devices. This costs $100 for what they call a
"starter kit" which is fully useable, but doesn't have many devices. The full
scale model is about $500

I have also used PALASM from AMD. They gave us a version free. Its very good,
and very easy to use, with many parts supported, and a moderately good wave
editor/ simulator. I don't believe this is very expensive ($150 maybe) since
they gave us a copy just for buying some GALS.

We tried SNAP from Signetics. This is next to useless since it only supports
their esoteric devices.

--
Don Bowman                (519) 744-6154     dbowman@zeus.uwaterloo.ca
Newsgroups: sci.electronics
From: johnr@mik.uky.edu (john s roberts)
Subject: Re: Opening other people's Garage doors :)
Organization: University Of Kentucky, Dept. of Math Sciences
Date: Fri, 2 Oct 1992 22:30:36 GMT

In <kennehra.718059469@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:


>Hi.  I was wondering if its possible to construct a garage door
>opener that can broadcast on any frequency you want so that you can
>open other people's garage doors as you drive by :)

>- Rich


I have also wondered about this, however there is more to it than just 
locating the frequency, but also figuring out what type of code is sent.
I have no idea where to start in figuring something like that out
(I am just an EE freshman)  Good Luck

John
--
  --==+  John S. Roberts, Jr.    Internet: johnr@mik.uky.edu (NeXT)  +==-- 
  --==+  Lexington, Kentucky        Other: mtbb136@ms.uky.edu        +==--
  --==+  Home: (606) 272-1417         Ham: pending 146.760-          +==--
  --==+  Work: (606) 257-6100         DoD: trying                    +==--
From: siegel@hprisc-28.cae.wisc.edu (Jeffrey Siegel)
Newsgroups: sci.electronics
Subject: How do fluorescent lights work?
Keywords: flurorescent
Date: 4 Oct 92 21:02:54 GMT
Distribution: usa
Originator: siegel@hprisc-28.cae.wisc.edu


How do fluorescent lights work? I am specifically 
interested in the steps that occur when you turn on
a fluorescent light. I took one apart and found a
two terminal device labeled "starter" along with a
transformer and the tube itself. What is the "starter"

Jeff
Newsgroups: sci.electronics
From: millsm@nextnet.csus.edu (Matthew Mills)
Subject: Looking for AC Analysis programs
Organization: California State University Sacramento
Date: Mon, 28 Sep 1992 22:34:32 GMT

Hello world,
   I am doing some AC timing analysis for digital circuits, mostly by
   hand and a little bit with Excel.  Is there any nifty programs out
   there that could make my life a little easier or faster? 
   Please EMail me any suggestions, if I get a good responce I will
   summarize in another posting.  Thanks!

   Matthew

-- 
| Matthew Mills                       | To do is to be - Socrates 
| Technical Lab Assistant (CSUS)      | To be is to do - Plato
| mail-> millsm@csus.edu              | Do Be Do Be Do - Sinatra
Newsgroups: sci.electronics
From: Scottl@mot.com (Scott Lindsey)
Subject: Re: FM stereo in TIME domain.How does stereo FM radio work?)
Organization: Motorola Land Mobile Products Sector
Distribution: usa
Date: Tue, 6 Oct 1992 19:40:09 GMT

In article <1992Oct05.172142.5600@ssc.com>, markz@ssc.com (Mark Zenier) writes:
> 
> jeh@cmkrnl.com writes:
> : In article <1992Oct03.042813.15261@ssc.com>, markz@ssc.com (Mark Zenier) writes:
> : > In article <1992Oct1.165659.8131@bnr.ca> mwandel@bnr.ca (Markus Wandel) writes:
> : >>Say that everything was based on square waves, and that you started out
> : >>with a 38KHz clock waveform.  Based on this clock, you alternately select
> : >>the left or the right channel for transmission, transmitting a sequence
> : >>of samples L, R, L, R, L, R, etc.  
> : > 
> : > Did any commercial gear work this way?
> : 
> : Someone else mentioned that at least one of Heath's top-of-the-line receivers
> : did.  And many (most?  all?) recent color tvs demodulate the 3.58 MHz chroma
> : subcarrier this way. 
> 
> Sorry, the question should have been: Do commerical FM stereo transmitters
> work this way?  (I've been trying to come up with a cheap stable FM stereo
> exciter for a couple of years.)
> 
> My speculation is that, within the broadcast community, this technique
> is well known.  But outside that, most people are working off the
> description from the FCC regulations, which is the frequency domain
> description.  (Since they are more interested in bandwidth and 
> interference than simple design.)
> 
> So you end up with things like the North Country Radio/Graf and Sheets
> transmitter (Radio-Electronics March and April 1988) which used a
> balanced modulator for the 38 kHz subcarrier and was overly complex.
> And didn't work well, according to a friend who built one.
> (Which makes sense, keeping your phase responses right through all
> that would be hard.)
> 
> Mark Zenier  markz@ssc.wa.com  
> 
Speaking of old tuners, can anyone lend some insight into the historic 
Marantz 7B tuner which came out in about 1966??? It is still
regarded as one of the finest FM tuners made!!! A few years back, I go a bunch
of Marantz equipment from an estate sale. Aside from the fact that it uses
tubes and had a totally cool oscilloscope built into it, what made this tuner 
have such fantastic sensitivity and sound???? Is it possible to obtain a 
schematic and build a tuner with more modern components??

Newsgroups: sci.electronics
From: ray@anaconda.cis.ohio-state.edu (william c ray)
Subject: Re: Triggering multiple flashes to "paint with light"
Organization: The Ohio State University Dept. of Computer and Info. Science
Distribution: usa
Date: Tue, 6 Oct 1992 19:04:25 GMT

In article <1992Oct6.151125.15989@cis.ohio-state.edu> fontana@dogwood.cis.ohio-state.edu (Mark Fontana) writes:
>What I'd like to do is position these tiny flashes all around the room,
>then fire the first flash manually.  The other flash circuits would detect
>this main flash and delay for a preset interval before firing. 

>I'm looking for advice on how to wire these up.  I figure I can
>just use an RC circuit on each one to get the desired delay.  The two
>main problems are:
>
>     2) discharging the flash capacitor (200uF?) without frying
>        components left and right.  Are there SCR's that can handle this
>        directly, or should I plan on using little relays?
>

No real help on the 1st question (triggering mechanisms) but you reallly
don't have a problem w/ the second... You don't need to discharge the
Cap through any components... the Cap discharges through the tube, and
is _always_ connected directly across the tube.  Now it doesn't 
discharge or leak across the tube when it is not firing because the
gas in the tube in a relatively good insulator.  What _does_ allow
it to discharge is ionization of the gas in the flash-tube.  Notice
that there are 3 wires going to the tube?  2 of those should protrude
through the envelope at the ends, and terminate in some short 
(usually dark) pegs.  If you measure the voltage on them when the
flash is fully charged, you'll find that they are direcly connected
to the Cap.  The third wire should be connected to a bit of foil
along the surface of the tube, or perhaps a thin wire wrapped around
the tube.  This will run almost the whole length of the tube, and
is the trigger for the flash.  you'll find it to be isolated when
the flash is charged.  Now to discharge the flash, what needs to
happen is the gas be ionized, which lets current flow, which ionizes
more gas, etc, and POP you get a flash.  That initial ionization
is caused by application of voltage to this third "mystery" wire.
Since the current flow through the trigger wire is low (only
enough to start ionization) you should be able to use just about
any switching mechanism that won't break under the full voltage
of the flash.

Hope that helps

Will Ray
ray@cis.ohio-state.edu
From: Babak.Sehari@mailbox.bison.mb.ca (Babak Sehari)
Newsgroups: sci.electronics
Subject: Re: How does stereo FM radio work?
Date: 25 Sep 92 06:07:08 GMT

Organization: Iowa State University of Science and Technology, Ames, Iowa.

---
Now you got the guy more confused than he was before.  He did not ask for
detail spectrum analysis! He just simply wants to know how it works. Modulation
at 38MHz is for the purpose of shifting the signal 19KHz upward.  Well, I
guess some people have to show off all the time. -:)

                                   With highest regards,
                                        Babak  Sehari.

 * Origin: The Electronic Mailbox (1:348/7.0)