HDTenEightyP/NetNews huggingface dataset:
Organization: Queen's University at Kingston
Date: Monday, 27 Jul 1992 11:06:11 EDT
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: Any LOW power PAL/GALs?

In article <1992Jul27.025931.6415@ee.ubc.ca>, jmorriso@ee.ubc.ca (John Paul
Morrison) says:
>
>I want to use a PAL or equivalent in a low power application.
>So far, the best I've done is a NS GAL20V8, quarter power.
>
>Allegedly this part is CMOS (EEPROM), but I measured about 30 mA
>sucked in, when nothing was clocking it. Doesn't sound like
>CMOS to me (ie  uA standby current).

There are alternatives if you can program other PLD's.  Some of the
supersets of GAL's have a turbo bit.  When this bit is disabled, the
PLD powers up only when the inputs changes states.  At low clock
speeds, this approach save power at the expense of a slower speed.

One of such chips is Intel's 85C224.  (7.5ns doesn't have a turbo bit for
some obvious reasons... ;)   By using crossing programming or conversion
utilities, you can create the JEDEC file for it.

>jpm

K. C. Lee
Elec. Eng. Grad. Student

P.S. I have no connection with Intel except for being a happy user of
     their most excellent PLD Shell+ software and hated 80x86 in general.
From: gkwan@balboa.eng.uci.edu (Greg Kwan)
Subject: HC16 Toolkit Rebate
Newsgroups: sci.electronics
Organization: University of California, Irvine
Date: 27 Jul 92 06:48:40 GMT

Does anyone know the expiration date for applying for the rebate?
Originally it was 16.MAY.92, but since they had supply problems,
Motorola extended it. (I didn't receive my kit until last month.)

Also, does anyone know how picky Motorola is on the correct an-
swers? I'm pretty sure my program is working, but just as I was
checking the actual dB levels, my signal generator took a dump.
(ok, I might have inadvertently shorted it out--cheap home brew
stuff :-(


greg

gkwan@balboa.eng.uci.edu
From: jimc@tau-ceti.isc-br.com (Jim Cathey)
Newsgroups: sci.electronics
Subject: Re: Life after CDs
Date: 29 Jul 92 01:07:12 GMT
Organization: ISC - Bunker Ramo, Spokane, WA

In article <ultima.712363459@mcl> ultima@mcl.ucsb.edu (David Rosen) writes:
>I used to think the max was 76 minutes, until I got one that had 79
>minutes!  I was thinking it might be just those blank spaces that they
>put in--you know, the countdown in between songs, about 3 seconds
>usually.  Maybe if those were removed, it might be less...

I thought intertrack delays were tripped by a delay code in one of the
subcode fields, and that there isn't actually a huge run of zeros in the
data fields. 

-- 
+----------------+
! II      CCCCCC !  Jim Cathey
! II  SSSSCC     !  ISC-Bunker Ramo
! II      CC     !  TAF-C8;  Spokane, WA  99220
! IISSSS  CC     !  UUCP: uunet!isc-br!jimc (jimc@isc-br.isc-br.com)
! II      CCCCCC !  (509) 927-5757
+----------------+
			"PC's --- the junk bonds of the computer industry"
Newsgroups: sci.electronics
From: ssave@ole.cdac.com (Shailendra Save)
Subject: Re: Life after CDs
Organization: CDAC , WA
Date: Mon, 27 Jul 1992 21:24:55 GMT

In article <3664@wzv.win.tue.nl> rob@wzv.win.tue.nl (Rob J. Nauta) writes:
>jsimon@rchland.vnet.ibm.com (Gerald Simon) writes:
Jerry>>This may sound stupid but, when I look at the back side of a CD (the side
Jerry>>the music is on), the light reflected back in the first part of the CD 
Jerry>>(usually less than 1/4 inch from the outside) differs from the light reflected
Jerry>>back from the rest of the CD.  I've always assumed that's the portion of the CD 
Jerry>>where the music is recorded.  If that assumption is correct, than there is 
Jerry>>a LOT of space left over for additional music over the rest of the CD....How 
Jerry>>wrong am I?
Jerry>>Jerry
>
Rob>A CD stores music from the inside to the outside ! Thus you are wrong.
Rob>This is why 3" CD's work - the player doesn't care that an unused piece
Rob>of plastic is missing, the music is on the inner circle.
Rob>Rob


   The dots are spaced out more as you go to the outer edge of the disc, since
the radial speed increases as you go from inside to the outside. I wish they could
decrease the speed of the disc as the laser pickup reaches the outside of the disc, 
and store more stuff on it.  What do you think?

-S
ssave@ole.cdac.com
Newsgroups: sci.electronics
From: sepa@enel.ucalgary.ca (Michael Sepa)
Subject: RS-422A and RS-423.  Whats the diff?
Date: Tue, 21 Jul 92 17:47:20 GMT
Organization: ECE Department, U. of Calgary, Calgary, Alberta, Canada

Hi!

I have a really silly question to ask, but I don't know where to 
look for it.

What exactly is the difference between an RS-422A and an RS-423
standard?  Are they as close as their numbers seem to indicate?

The reason I'm asking is that I read that the NeXT machine uses
the RS-423 standard for its serial communications.  The HP
deskwriter I own uses the RS-422A standard so it can talk to
Macintoshes.  I want these two items to talk.

I've been told that the new operating system for the NeXT will support
AppleTalk without massive hardware changes, so I think (I hope) that
a NeXT machine will be able to talk to the HP deskwriter over the
serial connection.

Any leads to the definition of the two standards is greatly
appreciated.  If anyone else is curious about the outcome, I will
mail (or post) any replies.


Thanx in advance! 

Michael

e-mail:  sepa@enel.ucalgary.ca

Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
From: pjh@mccc.edu (Pete Holsberg)
Subject: Re: Airport X-Rays
Organization: The College On The Other Side Of Route One
Date: Sun, 26 Jul 1992 11:52:28 GMT

In article <14pecvINNn1a@darkstar.UCSC.EDU> ted@helios.ucsc.edu (Ted Cantrall) writes:
=Someone who travels often should do us all a favor and experiment. Pack
=360K, 1.2M and 1.4M disks with data (one big ZIP file, perhaps) and put
=them in the luggage that will be X-rayed. Trying to unZIP the file will
=reveal if any of the data has been corrupted. If several people do this
=in several airports (a variety of X-Ray equipment) and post the results,
=we'll all know for sure.

I, for one, can report that a 1.44MB 3.5-inch MS-DOS diskette made it
unscathed through two X-ray machines -- Philadelphia and Birmingham, AL.
The diskette was in a pocket of my Lands End attache case that rode down
the belt.

Pete
From: dbushong@wang.com (Dave Bushong)
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Date: 21 Jul 92 19:35:00 GMT
Organization: Wang Labs, Lowell MA, USA

I got shocked turning on the water faucet in the front yard a couple
of weeks ago.  I went inside to switch the circuit breaker and when
I opened the breaker-box door, THAT gave me a shock.
-- 
==========================================================================
Dave Bushong, KZ1O@K1UGM.MA         +    No .sig, no tattoo, 
Wang Laboratories, Inc.             +        no bald spot, no nothin!!
Internet: dbushong@wang.com         +-------------------------------------
Project leader, OCR Products        + (reserved for future expansion)
Newsgroups: sci.electronics
From: amconn01@ulkyvx.louisville.edu
Subject: Re: Airport X-Rays
Organization: University of Louisville
Date: Tue, 28 Jul 1992 10:59:27 GMT

In article <1992Jul28.020140.24081@usenet.ins.cwru.edu>, wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)> 
> So how sensitive IS film to X-rays, anyhow?
> 
Photographic film is generally very insensitive to direct x-ray exposure. Even
film designed for x-ray exposure, such as that used in medical diagnostic
radiology, has an x-ray sensitivity of less than 1%. For this reason, x rays
are converted to visible (or near visible) light energy by the use of
intensifying screens (similar to the principle you were using). Direct film
exposure is used in certain situations where high resolution is needed, but at
the cost of increased patient exposure.

Michael Connor/Castigat ridendo mores!
 
Newsgroups: sci.electronics
From: johnh@macadammq.edu.au (John Haddy)
Subject: Re: PC masks from a laser printer??
Organization: Macquarie University, School of Mathematics, Physics, Computing and Electronics
Date: Tue, 28 Jul 1992 22:32:02 GMT

In article <1992Jul27.225040.606@cmkrnl.com>, jeh@cmkrnl.com writes:
|> 
|> 	YOU SHOULD NOT ASSUME THAT A LASER PRINTER IS A PRECISION DEVICE!
|> 
|> Specifically, you should not assume that your laser printer will lay down toner
|> in the same place every time, not until you test it.  
|> 
|> Here's one test.  Coax your printer to printing a 6" square grid of 0.1-inch
|> squares.  Print two such grids onto separate sheets of white paper.  Find a
|> light table or something similar, lay the two grids on top of one another, and
|> see if you can make them match up *everywhere at once*.  Never mind getting
|> them to match up with the edges of the pages aligned -- that's not an issue,
|> that's what the crop marks on your PCB pattern are for.  No, I'm talking about
|> getting them to match up *at all*. 

Before lining them up, let them settle for a while. The thermal setting process
which bonds the toner to the paper also has the effect of making the paper/mylar
warp. I've found that letting the mylar settle for a couple of hours in a stable
temperature environment helps immensely.

In fact, every laser printer around here that I've tried (HP's and Apple's) can
produce good artwork - at least for boards up to about 8"x6". Good artwork in
this case means that 0.1" hole spacings for DIPs are still close enough to 0.1"
that a 48pin DIP will fit easily. We don't usually go beyond one trace between
DIP pads.

For information, I prefer min. 0.012" track widths. We make our own boards (double
sided, non plated thru holes) and the etch bath varies in its characteristics, so
we like tracks to be wide enough to cope with a little corner undercutting if it
happens.

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

      |  _  |_   _   |_|  _   _|  _|              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

----------------------------------------------------------------------------
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: k080093@hobbes.kzoo.edu (Josh N. Vander Berg)
Subject: Re: Life after CDs
Organization: Kalamazoo College
Date: Thu, 30 Jul 1992 15:08:11 GMT

In article <1344@eouk23.eoe.co.uk> ahaley@eoe.co.uk (Andrew Haley) writes:
> 
>76.5 minutes!  Ow!  That must be played at a funereal pace!  The
>version I've got, which is (allegedly) played at the speed given by
>Beethoven's metronome markings, is 62:23.  I think it's probably the
>fastest version ever recorded, but that's how I like it... :-)
>

Say, how about putting a little compression on CDs?  Last I had heard there
was some device made by Sony that used smaller discs that held the same amount
of music as a normal 5 inch disc.  Does anyone know of plans to add
compression to the standard 5 inch format, and how much might such a disc be
able to hold? 

--
From: tcmay@netcom.com (Timothy C. May)
Newsgroups: sci.electronics
Subject: Re: Spark generator
Date: 24 Jul 92 18:49:27 GMT
Distribution: usa
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

tcora@pica.army.mil (Tom Coradeschi <tcora>) writes:
: ben@datacomm.ucc.okstate.edu (Ben James) writes:
: >In article <1992Jul12.040830.17021@norfolk.vak12ed.edu>
: >fculpepp@norfolk.vak12ed.edu (Fred W. Culpepper) writes:
: >>Tony,
: >>
: >>	Be careful, these damn things can kill!!!!!  The
: >>voltages are frequently in excess of 10,000 volts.  I used one
: >>in my classes made from an old neon transformer rated at 30,000
: >>volts @ 30 ma.  I only operated it when it was completely
: >>encased in a plastic cover so there was no chance of anyone 
: >>comming in contact with the high voltage leads.  
: >>
: >>	In the days of neon signs, many workers were injured,
: >>some killed because of careless contact with the high voltage
: >>terminals.

I feel lucky I never seriously zapped myself or anyone else at some
science fairs in the late '60s. I rigged up a Jacob's Ladder from
a neon sign transformer ($10, used, in 1968, probably more now) and
then studied the rf emissions when the arc was in a 2000 gauss 
magnetic field (from a giant magnet bought for $20 in 1967 from 
Edmund Scientific...ahh, the good old days).

I had no special shielding around the setup, even at the public
science fairs. In those days we considered electrocutions of 
bystanders to be "evolution in action."

Seriously, I wonder just how OSHA and liability suits have affected
things like science fairs? Are the kids discouraged from building
the high-voltage gadgets that used to be so common at science fairs
in the past? I remember cyclotrons, plasma torches, and scads of 
spark generators.

I will say I got a few serious scares whe experimenting, and
knowing what I know now, I'd be much more careful.
-- 
..........................................................................
Timothy C. May         | Crypto Anarchy: encryption, digital money,  
tcmay@netcom.com       | anonymous networks, digital pseudonyms, zero
408-688-5409           | knowledge, reputations, information markets, 
W.A.S.T.E.: Aptos, CA  | black markets, collapse of governments.
Higher Power: 2^756839 | RSA MailSafe Public Key: by arrangement
From: mcmahan@netcom.com (Dave Mc Mahan)
Newsgroups: sci.electronics
Subject: Re: TOUCHtone "emulator"
Keywords: touchtone
Date: 28 Jul 92 21:15:02 GMT
Organization: Dave McMahan @ NetCom Services


 In a previous article, admerlev@cipy.e-technik.uni-erlangen.de writes:
>Hi, do you know if there is/was in one of the
>apppropriate magazines a circuit to build a thing that creates
>telephone touchtone dual-frequency tunes ?
>(In order to control a answering machine in still mostly pulse-controlled
>germany .)

Once upon a time, Radio Shack sold a small box that made such tones.
(Radio Shack is known as Tandy Corporation in Europe).  I'm not sure if you
can get the U.S. product line in Europe, but they are cheap and asking is
easy.  The other thing to check is if the TouchTone box you buy makes the
same set of tones in Europe as the United States.  I think the DTMF tone
standard is the same around the world, but it would be a good thing to
check.  About the only other option is to purchase a DTMF chip from
somebody like Siemens or Motorola and build your own.

>Arnd

   -dave

-- 
Dave McMahan                            mcmahan@netcom.com
					{apple,amdahl,claris}!netcom!mcmahan
Newsgroups: sci.electronics
From: dchouina@sobeco.com (Daniel Chouinard)
Subject: Re: SHOCKING STORIES
Organization: Sobeco Ernst & Young
Date: Wed, 22 Jul 92 18:00:00 GMT

In <1992Jul22.055148.8779@mailhost.ocs.mq.edu.au> johnh@macadammq.edu.au (John Haddy) writes:

>In article <1992Jul18.175339.10396@newstand.syr.edu>, feliccia@rodan.acs.syr.edu (Nicholas J Feliccia) writes:
>|> ..
>|> 
>|> Ok. I want to know from the net people. What is the largest voltage shock
>|> you have ever received (and survived.) I am not talking about rewiring
>|> a light switch. I am talking about kissing the flyback transformer.
>|> 
>|> Nick.
>|> -------------------------------------------------------------------
>|> feliccia@rodan.acs.syr.edu
>|> N3FKS
>|> 

>Perhaps one shouldn't be bragging - it might prompt some bozo out there to try
>and better the "record". Surely the largest shock _anyone_ has ever received
>is already documented in the Guiness book of records: those few (extremely lucky)
>people who have been hit by lightning and survived.
>[:.,$d]

  My ex-girlfriend is one of those.  Sitting in her appartment, watching TV,
she saw a thin "blueness" cross the room to her tv and BOOM!  She woke up
2 or 3 hours later, throwing up.  Her left hand was burnt 2nd degree and
all electronic equipment blown.  She was in bed for 2 weeks after that.

  Personnaly, it almost happened to me too.  I clearly rememeber the after-
image of the bolt, approx. 5 meters/yards in front of me, the odor of ozone
and the tingling sensation that all my legs and arms hair stood up, the
temporary deafness and blindness.

  We get magnificient July lightning storms up here in Montreal.

						dchouina@sobeco.com
From: jlegg@neptune.phys.ufl.edu (Jeff Legg)
Newsgroups: sci.electronics
Subject: PAL/Universal programmer
Date: 21 Jul 92 19:40:03 GMT
Organization: University of Florida Physics Department - CMT Group

Greetings,
We are getting ready to purchase a low end universal programmer.  We
are seriously looking at Tribal Microsystems Inc.'s unit and would like
to know if anyone has any comments on their TUP-400 system?
Regards,
Jeff Legg
From: gt8021a@prism.gatech.EDU (EASON)
Newsgroups: sci.electronics
Subject: Re: 20W Audio amplifier chip TDA1520
Summary: It works!!!  Thanks!
Date: 30 Jul 92 15:05:10 GMT
Distribution: usa
Organization: Georgia Institute of Technology

Thanks to all who responded to my questions about the Philips/Signetics
TDA1520 audio amplifier chip: Matthew Kleinmann, Dave Medin, Arun Rao, Chris
Richmond, K. C. Lee, and Dzung T. Hoang.  I got one channel working last
night (about 12am!).

For those who are interested, the TDA1520 is a mono "20W Hi-Fi Audio Amplifier"
chip that Radio Shack used to sell.  I bought two on closeout there at least
two years ago.  Dave Medin reports that Signetics still makes the chip, and
it's available from Digi-Key (price?).  It's about 1"x1/2", 9-pin SIP.

Most people reported that it has great audio quality.  I have to agree.  It
takes a 15-50VDC power supply, which presented me with a new design problem.
I ended up using an unregulated 25-30V supply made from a Radio Shack $9.50
18V, 2A transformer, a full-wave bridge rectifier, and four 1000uF capacitors.
The specs report 58dB power supply ripple rejection at 100Hz, so I figured
this would be safe.  If I heard hum, I'd add more capacitors first, then 
consider a regulator.  R/S also has a 25.2VAC(?) transformer, but the 
capacitors I had picked up at 4/$1 were only rated at 35V, so I went with 
a little lower power.  (Thanks for suggesting unregulated supplies, Dzung!)

The chip has internal thermal protection circuitry, but it needs a heat sink 
for normal operation.  I bought a big one with two sets of fins and sawed it
in half.  Again, Dzung Hoang's voice of experience came in handy in telling
me not to mount both chips (two for stereo) on the same heatsink.  Doing
this lets the smoke out, and they won't work any more.

As for my results, I wired the power supply tuesday pm and started on the
amplifier section.  Last night I finished one channel of the amplifier,
checked my wiring against the "test & application" circuit on the specs,
and went to the living room stereo.  I decided to use an old speaker from
a walkie-talkie first, then an old TV speaker before going to the good ones.
I had wired an RCA jack on the input, so I took one channel from the CD
player, plugged in my new amp, and looked for smoke.  No smoke, but sound
from the speaker.  I couldn't play it too loud for the roommates' sake, but
it seemed to work on both the little speakers and the big stereo speaker.

This morning, I decided to do a comparison test between my amp and the
stereo amp.  First, I checked the volume that the TDA1520 would deliver.
It was more than enough for casual (even loud) listening.  I could really
tell no difference between it driving one channel and the stereo driving
the other channel.  I was impressed, and can't wait to built the other
amplifier channel of my new toy.

Thanks again for your help.  Questions, comments are welcome.
-wte



-- 
Bill Eason         w-404/894-2381        h-404/352-6914
BE-EE/CS May 1987    MS-EE June 1992    PhD-CS ???? 19??
wte@cdrom.gtri.gatech.edu (pref.)  -or-  gt8021a@prism.gatech.edu
Newsgroups: sci.electronics
From: dbushong@wang.com (Dave Bushong)
Subject: Re: Shocking stories
Organization: Wang Labs, Lowell MA, USA
Date: Tue, 21 Jul 92 23:37:57 GMT

deaven@physics.Berkeley.EDU (David Deaven) writes:

>> -=> Nicholas J Feliccia spoke of "Shocking stories" <=-
>> Ok. I want to know from the net people. What is the largest voltage
>> shock you have ever received (and survived.) I am not talking about

>One summer I was just finishing mowing our (slightly wet) lawn, with a
>lawn mower that had lost the spark plug boot. I wondered just how hot

When I was in 7th grade or so, I used to (illegally) ride my
minibike on the street, on my way down to the canyon, where
it *was* legal to ride it.  Whenever I saw a cop, I'd flip the
kill-lever over to the spark plug, which killed the engine.  I
figured it was OK to "coast" on an unpowered minibike.  Well, one
time, I saw a cop and when I reached down, I grabbed the top of the
spark plug, not the grounded thing. BAM BAM BAM BAM BAM BAM right
into my fingers and right up past my elbow.  I didn't wreck, but
watching the cop laughing at me (he must have figured out
what happened) added insult to injury.

He didn't stop me.

I didn't do it again.

-- 
==========================================================================
Dave Bushong, KZ1O@K1UGM.MA         +    No .sig, no tattoo, 
Wang Laboratories, Inc.             +        no bald spot, no nothin!!
Internet: dbushong@wang.com         +-------------------------------------
Project leader, OCR Products        + (reserved for future expansion)
Newsgroups: sci.electronics
From: hansie@ph.tn.tudelft.nl (Hans Remmerswaal)
Subject: KP100A (PHILIPS)
Summary: I'm looking for 25 KP100A sensors
Keywords: KP100A
Organization: Delft University of Technology
Date: Tue, 28 Jul 1992 13:12:36 GMT

I'm looking for 25 pieces of KP100A pressure sensors (Philips).
I can't buy then anayware so if you can deliver then, contact me:

Segboer Metaal b.v.
De Hondert Margen 16
2678 AC  De Lier
the Netherlands

Tel. 01745-14872
Fax  01745-17395

I can't read my Email often, so please use your fax or telephone.


                                Thanks, J.N.M. Remmerswaal
-- 
* Hans Remmerswaal               * Email: hansie@ph.tn.tudelft.nl * 
* Delft University of Technology * Phone: (0)15-785880            *
* Lorentzweg 1                   * Fax  : (0)15-783251            *
* 2628 CJ  Delft                 * Room : F282                    *
Newsgroups: sci.electronics
From: warren@julian.uwo.ca (A Warren Pratten)
Subject: Re: Life after CDs
Organization: University of Western Ontario, London
Date: Wed, 29 Jul 1992 16:36:52 GMT

In article <ultima.712363459@mcl>, ultima@mcl.ucsb.edu (David Rosen) writes:
|> In <1992Jul24.195249.4172@coli.uni-sb.de> chbl@sbustd.rz.uni-sb.de (Christian Blum) writes:
|> >smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
|> >> In article <1992Jul23.041115.20377@bilver.uucp>, bill@bilver.uucp (Bill Vermillion) writes:
|> >> There is a story (probably apocryphal, anyone know?) that the 74 minutes
|> >> time was chosen because it was just long enough to hold the Sony MD's wife's favourite piece of classical music...
|> >Sorry that I don't know about your story, but I do know that I've got a CD
|> >with 76 minutes of music on it... and I've seen one with 77 minutes!
|> 
|> I used to think the max was 76 minutes, until I got one that had 79
|> minutes!  I was thinking it might be just those blank spaces that they
|> put in--you know, the countdown in between songs, about 3 seconds
|> usually.  Maybe if those were removed, it might be less...
|> 
|> --Dave
|> ultima@mcl.mcl.ucsb.edu

I have a couple of disks that are 79 minutes and one I believe that is 81
minutes.  I believe the limit is 84 minutes.

-- 
A Warren Pratten
Email: Pratten@uwo.ca
From: dmackie@netlink.cts.com (Dave Mackie)
Newsgroups: sci.electronics
Subject: sources for Japanese type semiconductors?
Date: 20 Jul 92 14:24:31 GMT
Article-I.D.: netlink.kJs8NB1w164w
Organization: NetLink Online Communications, San Diego CA

Does anyone have suggestions for, or pointers to, sources for
Japanese type (2SA, 2SB, 2SK, etc) semiconductors?

Thanks in advance.

-dave

--                    
INTERNET:  dmackie@netlink.cts.com (Dave Mackie)
UUCP:   ...!ryptyde!netlink!dmackie
NetLink Online Communications * Public Access in San Diego, CA (619) 453-1115