HDTenEightyP/NetNews huggingface dataset:
Organization: Queen's University at Kingston
Date: Saturday, 15 Aug 1992 16:41:55 EDT
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: GAL Programmer using 68HC705K1 - UPDATE
 <1992Aug15.043342.15538@ssc.wa.com> <1992Aug15.154708.3143@cc.gatech.edu>

In article <1992Aug15.154708.3143@cc.gatech.edu>, byron@cc.gatech.edu (Byron A
Jeff) says:
>
  [stuff about A types of chips deleted ]
>I'm sure that's just software that reads signature info from the part.
>For my purposes I'm perfectly happy to be able to program only one class
>of parts.

BTW the labels on the chips aren't always to be trusted.  I have 4 NS
GAL16V8-20LNC chips (date codes:9148 and 9224), they have to be
programmed as 16V8A.  My programmer recognizes them just fine.

>Byron A. Jeff - PhD student operating in parallel!

K. C. Lee
Elec. Eng. Grad. Student
Newsgroups: sci.electronics
From: fridberg@alcvax.pfc.mit.edu
Subject: info on caller ID request
Organization: MIT PLASMA FUSION CENTER
Date: Sat, 15 Aug 1992 17:59:19 GMT

I'm thinking about building caller ID system that i could interface with
computer, but i have no idea about how caller id works. Does anybody have info
like friquensies, timing, protocols, voltages, ets. or know were i can find it?
Any help would be greatly appreciated.
Mike.
Xref: sparky sci.electronics:14634 sci.materials:646 sci.research:884 comp.lsi:553
From: hoff@fasic5.fnal.gov (Jim Hoff)
Newsgroups: sci.electronics,sci.materials,sci.research,comp.lsi
Subject: Re: Current research in chip fabrication technology
Date: 20 Aug 92 14:39:48 GMT
Followup-To: sci.electronics
Organization: Fermi National Accelerator Lab

In article <1992Aug20.004110.3357@unixg.ubc.ca>, sankey@unixg.ubc.ca (Todd Sankey) writes:
|> 
|>   I am trying to prepare a presentation on the current state of research
|> in chip fabrication. I am requesting any sort of information from
|> researchers/students/engineers/anyone in the know.
|> 
|>   Full credit will be given to all contributors. I am asking for
|> any information available: a title, a short/long summary or even
|> a ful paper if one is handy. I can handle most any kind of
|> document from plain text to postscript or TeX.
|> 
|>   Please respond by E-mail to sankey@unixg.ubc.ca and thanks.
|> 
|> 		Todd Sankey
|> 		sankey@unixg.ubc.ca

I'm not really sure how to approach this.  I guess, in short, I'll just ask 
what exactly is it you want to know?  No offense, but this is like saying
I'm presenting a paper on trees, send me everything you know about trees.
It's just a little broad.  If you ask specific question, or even post a 
questionaire, I'll be happy to respond, if it is in my area, but, heck, I
could talk your ear off probably for several days running on 
"chip fabrication", and most of it would be of no interest to you whatsoever.

If you wish, please repost with a much more specific series of questions.

					Jim Hoff
From: thomasn@tekig5.pen.tek.com (Thomas M Nathe)
Newsgroups: sci.electronics
Subject: Re: Wanted: CRT Tube for TEK 2215 Scope
Date: 19 Aug 92 04:33:40 GMT
Organization: Tektronix, Inc., Beaverton,  OR.

In article <Bt768A.Ms4@world.std.com> sja@world.std.com (Stuart J Adams) writes:
>I am looking for a replacement CRT Tube for a TEK 2215 Scope. 
>Can anyone help me ????
>
>Thanks,
>Stuart Adams
>sja@world.std.com


Try 1(800)835-9433 x170 for starters.  I help out some on the 2200 line, doing
board test. Parts numbers for CRT's are bit out of my realm though. Hope the
phone number helps. :)
Newsgroups: sci.electronics,rec.audio,misc.wanted
From: wlee@csd4.csd.uwm.edu (Wan Ngai Wayne Lee)
Subject: Info for wrist radio wanted
Originator: wlee@csd4.csd.uwm.edu
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Distribution: usa
Date: Mon, 17 Aug 1992 02:13:26 GMT

I am posting the following for a friend.  Replies will be forwarded.
================================================================================
      name: Lee, Wan Ngai
      mail: 2121 E. Newport Ave., Milwaukee, WI, 53211
     phone: (414) 963-4157
  internet: wlee@csd4.csd.uwm.edu
compuserve: >internet:wlee@csd4.csd.uwm.edu


================================================================================
I would like to purchase an AM/FM wrist radio that has a variable
(not a two-position Hi-Lo) volume control.  Anyone know of
a manufacturer/mail order outlet?  I've love to fine a wrist unit
with digital tuning.
Newsgroups: sci.electronics
From: mortenpp@darwin.uio.no (Morten Paul Pedersen)
Subject: Re: TTL <-> 232 ICs pin compatible ?
Organization: University of Oslo, Norway
Date: Wed, 19 Aug 1992 08:20:18 GMT

I have used the MAX232, made by Maxim. It is pin compatible with
DS1228 ( actually, I think the Maxim part came first ). There is also
one pin compatible chip from Linear Technology called LT1081.

Morten Pedersen,  Univ. of Oslo, E-mail : mortenpp@bio.uio.no
Newsgroups: sci.electronics
From: knop@dutecag.et.tudelft.nl (Peter Knoppers)
Subject: Re: Simple transistor project (Q)
Summary: Use a 555 timer.
Organization: Delft University of Technology, Dept. of Electrical Engineering
Date: Fri, 14 Aug 1992 11:42:02 GMT

Andrew Reynhout was looking for a circuit that activates a relay for
one second on a rising edge on a logic input.

In a followup I suggested using a 555 timer as a one-shot driving the
relay. Besides the fact that the 555 is started by making the trigger
input low (this is solved by adding an invertor) there is a slight
(nonobvious) problem when the trigger signal stays active longer than
the output pulse of the timer. The application notes almost forget
to mention that this situation should be avoided. You will have to
ensure that the logic input signal will never stay on longer than the
output pulse.

If it is not possible to ensure that the input signal is low at the
end of the 1 second period, you'll have to add some logic that switches
off the trigger signal of the 555 after it has been started until the
logic input signal has gone low again.

The following circuit should perform that function:
                                        ___
Input >---+-----------+----------------|   |
          |           |                | & |o---> Timer trigger input
          |           |             ---|___|          (active low)
          |           |    ___     |
          |            ---|   |    |
          |               | & |o---+
          |        -------|___|    |
          |       |                |
          |       |    ------------
          |       |   |
          |        ----------------
          |           |    ___     |
          |      ___   ---|   |    |
           -----|   |     | & |o---
                | & |o----|___|
Timer output >--|___|

The 555 timer must be wired as follows:
Pin 1: GND
Pin 2: Trigger, active low, connect to output of circuit above, or to
       inverted logic input signal
Pin 3: Output (also drives the relay; don't forget the diode across the
       coil of the relay)
Pin 4: Reset active low, connect to VCC (max current is 200 mA)
Pin 5: 10 nF to GND
Pin 6: Threshold, connect to RC network
Pin 7: Discharge, connect to Pin 6 (and thereby to the RC network)
Pin 8: VCC

The RC network consists of a 1MOhm resistor to VCC and a capacitor of
1 uF to GND. (The one-shot time of this circuit is 1.1 * R * C so this
yields 1.1 second.)

Disclaimer: I have not tested this.

Success!,

Peter Knoppers - knop@duteca.et.tudelft.nl
Newsgroups: sci.electronics
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Subject: Re: Solder melting point (was Re: How hot can the 486-50 cpu run ?)
News-Software: VAX/VMS VNEWS 1.41    
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
Date: Wed, 19 Aug 1992 21:51:00 GMT

In article <THEN.92Aug19211705@vipunen.hut.fi>, then@vipunen.hut.fi (Tomi  H Engdahl) writes...
>In article <1992Aug18.151205.2809787@locus.com> dana@locus.com (Dana H. Myers) writes:

>>I can imagine the 486-50 running at 100-120 C, but not 400 C, even briefly.
> 
>I think that over 200C is too high for silicon chips.
> 
	Remember that because of thermodynamics, the junction temperature, (where
	the heat is generated,) must be hotter than the pins or the heat sink,
	(where the heat is dissapated.) Typically you want the junction to be
	at 100deg or less for reliable operation.

	
   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
Newsgroups: sci.electronics
Subject: Re: Building the Perfect Notebook
From: Mike_Diack@kcbbs.gen.nz (Mike Diack)
Date: 16 Aug 92 21:14:43 GMT
Organization: Kappa Crucis Unix BBS, Auckland, New Zealand

Bob M >There's no such thing as nicad memory.....
         (repeated lots)

RATS - i forget where i left my nicads :-)

Newsgroups: sci.electronics
From: markz@ssc.wa.com (Mark Zenier)
Subject: Re: GAL Programming revisited
Organization: SSC, Inc., Seattle, WA
Date: Wed, 12 Aug 1992 06:41:25 GMT

In article <1992Aug10.210350.8051@mnemosyne.cs.du.edu> aduell@nyx.cs.du.edu (Tony Duell) writes:
>I built the Elektor GAL rpogrammer. Worked first time on my IBM XT,
>absolutely no problems. 

I didn't build it yet, but I spent a bit of time with Codeview taking
the driver software apart.  Since I already have a 75 percent finished
PAL programmer project that can do the test vectors, all I wanted was the
programming algorithms.

I did find out a few cute things.

1.  It checksums the character strings for program version and author
and copyright and will exit if they are changed.

2.  There is a undocumented command '(' which prints the version and author.

3.  The 'P' program command has an added option that if you type it
in in the form "p p c number" it programs the part from the buffer
(as usual) and resets the "number of times programmed" information built 
into the part to whatever number you input.  

This applies to the version 6.51, file creation date of Feb 25, 1992.

Mark Zenier  markz@ssc.wa.com
From: Rick.Ellis@ofa123.fidonet.org
Newsgroups: sci.electronics
Subject: How hot can the 486-50 cpu run ?
X-Sender: newtout 0.01 Jul 13 1992
Date: 17 Aug 92  17:37:09

On <Aug 12 17:37> EE) writes:

 E> Can someone tell me just how hot the 486-50 is supposed to run. 
 E> I just got a 486-50 with 8 mb and a 256k cache and I am a little 
 E> concerned about the heat it generates. It gets too hot to keep a 
 E> finger pressed against the 486 chip for more than 5 seconds. Is this 
 E> normal ????

It is noraml.  A 486-33 will burn your finger!
Newsgroups: sci.electronics
From: markh@csd4.csd.uwm.edu (Hunk)
Subject: Re: Why are 8 bit TTL binary counters so hard to find???
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Distribution: na
Date: Sat, 15 Aug 1992 17:39:57 GMT

In article <1992Aug13.212738.26715@julian.uwo.ca> wlsmith@valve.heart.rri.uwo.ca (Wayne Smith) writes:
>I found a 74XX867 in an old TI data book, but no one has this chip.
>So like how come there are so few 8 bit anything in high-speed
>TTL?  I'd even pay $5 for a 16 bit TTL binary counter (32 MHz min.),
>But I doubt they exist...

What about the '590, '591, '592, and '593?
Newsgroups: sci.electronics
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: Re: Phone in use light - help!?
Organization: The World
Date: Tue, 18 Aug 1992 13:55:12 GMT

In article <1992Aug17.125829.12521@fwi.uva.nl> aroest@fwi.uva.nl (Axello de Roestello) writes:


   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)


A similar exclusion device is widely available here : it should be in 
most phone stores or department stores. It's the same shape as a 2 line
y-shaped RJ11 splitter, and goes for under $10 ( I think ). It's usually
sold as a device to stop the answering machine when a phone is picked up.

Inside it consists of just 2 zener diodes back-to-back. The model I opened
up also had a couple of LED's, but that's optional. The idea is, home
telephone wiring puts all phones in parallel. When the line is in use,
DC voltage drops from 48V to about 10V or so. The "answering machine"
outlet of the Y splitter connects to the wall through zeners, 
the "phone" outlet connects directly to the wall. 

To give the modem precedence over all phones, you'll need one of these 
for every outlet in the house. All phones plug into the "answering machine"
outlet, and the modem plugs into the "phone" outlet. The modem will
always over-ride voice calls then. 

/ Jon Sreekanth

Assabet Valley Microsystems, Inc.           |  Fax and PC products
5 Walden St #3, Cambridge, MA 02140         |  (617) 876-8019
jon_sree@world.std.com                      |
From: technews@iitmax.iit.edu (Kevin Kadow)
Newsgroups: sci.electronics
Subject: Knock Sensor (as in "on a door")
Date: 22 Aug 92 22:06:23 GMT
Organization: Technology News, IIT, Chicago, IL

I tried this experiment when I first read (in Popular electronics) about
using capacitors in place of piezo disks for electronic drums. 

	Basically, what I wanted to do was rig a device that could be
mounted to the INSIDE of a 1.5" wooden door, and when somebody knocks on the
OUTSIDE, it produces a sound...

e.g.:

Knock. TICK
Knock. TICK     (they knock, it makes a much louder TICK! or whatever.

	I managed to get it to work, but only if the sensor was on the outside
and one knocked directly on it- not much better than a doorbell. what could I
use as a sensor that will work on the inside to detect a "normal" knock?
--
From: u9dmlb@ohm.york.ac.uk (Duncan McL Barclay)
Newsgroups: sci.electronics
Subject: Re: Craftsmanship is dying
Date: 13 Aug 92 22:16:33 GMT
Organization: Electronics Department, University of York, UK

In general commercial stuff crafstmans ship is dead, but you can say that
about any commercial industry,

When I worked at a defence contractor's our technicians and CRAFTSmen were
brilliant. Wiring looms as thick as two fingers where every wire stayed
in place as it meandered about the box. The componemst themselves were 
boring but they were put together well.

My favorative method of prototying/on off designs is 'DEAD BUGGING' where
ics are turned upside down and everything occurs above a ground plane.
Its very rare that you need wire coz the leads of your capacitors and
resisitors (what you dont use those? must be a digital guy) are usually
long enough. Before anyone flames me for using this method it does work
and is a recommended method for mixing high speed ananlog and digits.

Oh yeah, I can loom up with the right knots and i am 22!!!!

Raggy

-- 
Raggy                 | God smiles upon the little children, the alcoholics, and
u9dmlb@ohm.york.ac.uk | the permanantly stoned. S.King.
Newsgroups: sci.electronics
From: jgd@dixie.com (John De Armond)
Subject: Re: Mirror Galvonometer HELP !!!!!
Date: Sat, 15 Aug 92 05:06:44 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

nagle@netcom.com (John Nagle) writes:

>        10KHz is faster than ordinary mirror galvanometers will go, even
>for small deflection angles.  There are resonant scanners available in
>that range from General Scanning Corporation, but they're expensive.

Honeywell has been making mirror galvos with a bandwidth better than
1 mhz for better than 20 years.  The light beam oscillograph I worked
on when I began my career in the early 70s was old hat.

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine (TM) |
Marietta, Ga                         |Interested in high tech and computers? 
jgd@dixie.com                        |Write me about PE Magazine
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
Newsgroups: sci.electronics
From: eric@zen.maths.uts.edu.au (Eric Lindsay)
Subject: Re: PCB-through hole plating...
Organization: University of Technology, Sydney, Australia
Date: Mon, 17 Aug 1992 22:58:51 GMT
Keywords: PCB

jon@cis.ksu.edu (Jon E Freise) writes:
>	I am looking for a method of plating the holes of Printed
>Circuit Boards by hand.  The University here has the ability to

I quote "Copperset is a simple manual systems that allows plain holes in 
PCBs to be through-plated instantly".  Kit  requires the PCB be standard 
1.6 mm (0.062 inch) thick.  You also need a soldering iron and pump or 
vacuum desoldering tool (looks like a hand one might work).  It is basically 
a set of hollow, solder filled tubes, such that you can break off PCB thick 
sections after placing them in the hole.  Use a punch (comes with the kit) 
to secure the ends, solder the board top and bottem, then desolder the core 
(don't bother desoldering if you are using it as a via, rather than for 
component placing.)

They quoted three hole sizes (0.8mm, 1.0mm and 1.2mm) in the advert I have.
Multicore Solders make it.  They are based in the UK, but quote a USA 
address 1751 Jay Ell Drive, Richardson, Tx 75081 214 238 1224 or 
fax 214 437 0288.  I haven't tried it - they wanted $250 (A$) for the 
kit here, and I figured I could get along without it for a while longer.
--
eric@zen.maths.uts.edu.au  Eric Lindsay, Sch of Maths, Uni of Tech
Don't take life too seriously.
It is only temporary.
From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Photo method of making pc boards
Date: 14 Aug 92 04:24:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 I just boughtmaterials to make circuit boards using the positive method.
I bought pc resist sensitizer $11 a can!. developer and a plant light and
a contact frame. I decided to use the sensitizer instead of presensitized
boards because I recently got a bargain on capper clad pc board cut to
my stange size of 9 and 3/8 by 10inches for a stereo im designing. Does
anyone have any hints on making this stuff work perfectly. My results
are fair to poor. 
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: Thu, 20 Aug 1992 00:24:15 GMT

Looking for a 256x8 serial to parallel FIFO.  Speed doesn't matter.
(256 is the minimum width)
It must be inexpensive (no more than 40 dollars) in quantities of one.
Please help.
.

Newsgroups: sci.electronics
From: rcdsdgx@dutrun2.tudelft.nl (Dik Groot)
Subject: Re: Source of 68HC705K1
Summary: none in europe
Keywords: none
Organization: Delft University of Technology
Date: Thu, 20 Aug 1992 19:01:52 GMT

In article <18AUG199215052853@rose.uib.no> fafaf@rose.uib.no (FRIHAGEN, ANDERS) writes:
>
>Do anyone have a source of reasonably priced 68HC705K1 OTP's?
>The Norwegian distributor has none in stock and will not get any from 
>Motorola for more than a month... 
>
The (A) Dutch distributor told me that the European side of Motorola 
is concentrating their sales on the 68*11 line of products, and so they
will not sell any *705's.

Try to buy them directly in the USA!

Dik Groot, State Academy of Fine Arts, Amsterdam.
using the facilities of Delft University of Technology, Netherlands.
d.groot@rc.tudelft.nl
From: acm@Sun.COM (Andrew MacRae)
Newsgroups: sci.electronics
Subject: Sony Control Specs?
Date: 18 Aug 92 16:33:40 GMT
Reply-To: acm@Sun.COM (Andrew MacRae)
Organization: Sun Microsystems, Mountain View CA
NNTP-Posting-Host: grendal.corp.sun.com

Some time ago I remember reading about a common device interface that
Sony had devised for their audio/video products.  I believe it was
called Control S or some such name.  At the time quite a few people
were asking for the specs.

Did this interface ever make it into general use?  If so, can someone
point me towards the specs?

						Thanks,
						Andrew MacRae
						
Newsgroups: sci.electronics,comp.sys.mac.hardware
From: stu5s11@bnr.ca (David Simmons 1342678)
Subject: Re: PowerBook 100 LCD screen replacement?
Reply-To: stu5s11@bnr.ca 
Organization: Bell-Northern Research, Ottawa, Canada
Date: Wed, 12 Aug 1992 15:04:38 GMT

(Sorry for not e-mailing this directly, but my company has cripplenet,
and I haven't figured out how to email this direct from xrn.)

>Well I dropped my PowerBook 100 and the screen cracked, pretty badly
>too.  A call to Apple Tech Service yielded the repair cost: $790.
>Yie, for that much I could buy a brand new PB 100!  Or rather, for
>that much, I can't.
>
>Does anyone have any clues as to the manufacture of the PowerBook LCD
>screen?  It's a 640x480 pixel device, so I'm kind of holding on to the
>hope that's it's not too obscure, and that I might be able find a
>replacement through retail electronic supply channels.

 First, the screen is unlikely to be a common type. There's a 50% chance
it a custom design for Sony. Second, $790 isn't that bad a price. LCD screens
are expensive.  The only reason Apple can afford to sell them for $900
is because they probably get a deep volume discount. As an individual you're
unlikely to get a better price.

EDN (Electronic Design for engineers) recently published an article 
on LCD screens. The prices listed were very high, usually over the $1000
price level.

Which brings a question to mind. I can't think of any ads in Byte that are
offering PC notebooks for less than $1000. Are there any? Or is Apple
dumping the PB 100s to get market share?

--------------------------------------------------------------------
John Andrusiak
From: merritt@macro.bu.edu (Sean Merritt)
Newsgroups: sci.electronics
Subject: HV meters, small current
Date: 19 Aug 92 15:06:54 GMT
Organization: Boston University Physics Department




Who makes a good HV meter?  (1kV to ~3kV)

I would prefer digital bench top type.

I also need to buy a small current meter (must go down to 10^ -6 amp range)
again digital bench top type.

manufactures and distributors, please respond via e-mail.


-- 
Sean J. Merritt		         |      Nietzsche che dice?
Dept of Physics Boston University| 	       Boh!	
merritt@budoe.bu.edu		 |