HDTenEightyP/NetNews huggingface dataset:
From: chbl@sbustd.rz.uni-sb.de (Christian Blum)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 30 Jul 92 11:20:24 GMT
Organization: Studenten-Mail, Rechenzentrum Universitaet des Saarlandes

shoppa@erin.caltech.edu (TIM SHOPPA) writes:
> 	I am far from an expert on CD formats and technology, but it seems to
> me that the CD manufacturer could lengthen the format the same way that an
> LP manufacturer did - by allowing less space between the spirals (a.k.a.
> "grooves").  CD's are not recorded in tracks and sectors as are floppies, but
> in a spiral.  This allows the head-positioning algorithm to smoothly track
> along as music plays, instead of having to jump from track to track and
> simultaneously trying to ensure that enough music was stored in the buffer to
> continuously play as the head settles on the new track.  There is probably a

Have you ever put your ear on your player while it was playing a CD?
It definetely steps!

> 	Also, I believe the same article pointed out that music *could* be
> recorded on both sides!  Has anyone actually seen this done?  It would mean
> that program information (and the trendy art designs) we are used to would
> be non-existent or in the very center circle of the CD.

Course. You simply have to put two CDs together. Try it in your player, it
works.

Chris.
From: nall@sun8.scri.fsu.edu (John Nall)
Newsgroups: sci.electronics
Subject: Amplifier for 25K Hertz...
Date: 24 Jul 92 18:41:08 GMT
Followup-To: sci.electronics
Organization: SCRI, Florida State University

Hi:
     I wonder if someone could share a bit of knowledge with me?
I haven't really fooled around with hands-on-electronics since
my Heathkit and ham-radio days (about 25 years ago), so am not
at all sure what sort of chips are available these days.

     What I have is a small box with a built-in speaker which
emits a ~25K Hz (above the range us humans can hear) when I
press a button.  The strength of the signal is very small.

     What I want to do is to amplify this signal and drive a
larger speaker.  The way that I'd like to do it is to pull the
signal which is now going to the built-in speaker off and direct
it to an audio amplifier.  The output of the audio amplifier would
then go to the larger speaker, with a variable control.  The
maximum desired signal would be 10 watts.

     Back in the "good ole days" I'd have gone to my trusty ARRL
manual, or something like that, and found a circuit for an audio
board, and built it up with a transistor and variable resistor.
I feel sure that there is probably a chip available to do the same
thing, but don't know what it might be.  (I've asked in my local
Radio Shack store, but the clerk there is not too bright.  She tried
to instead sell me a hi-fi amplifer :-)

     Thanks for any help.  BTW, I'm guessing on the exact frequency
of around 25K Hz, but it is around there somewhere (this device is a
dog training device, and the sound emitted is at a doggy frequency.
I need to extend the range).

John

--
John W. Nall              | Supercomputer Computations Research Institute
nall@mailer.scri.fsu.edu  | Florida State University, Tallahassee, FL 32306
    "You cannot be a beacon, if yo' light don't shine!"  
                                            - heard on the car radio...
Newsgroups: sci.electronics
From: robcruic@intacc.uucp (Robert Cruickshank)
Subject: Re: Spark generator
Date: Wed, 22 Jul 1992 01:30:39 GMT
Distribution: usa
Organization: Inter/Access' Matrix BBS
Keywords: Jacob's Ladder

In article <BrAsE6.8I2@world.std.com> jonas@world.std.com (Jonas R Klein) writes:
>I've seen a Jacob's Ladder made from two coat hangers and a transformer
>from a neon sign.  If you can get one of these, then building
>then you don't have to wind your own transformer.  
>
>Most surplus places have high voltage transformers from xerox machines
>and the like.  These don't have the current regulation of neon sign
>xformers, but still might work.  Anyone here that knows more
>about high voltage care to comment?  I have no experience; this is
>only from what I've read, so I don't know about safety.
>
>-Jonas Klein
>
>
>


Most of the Xerox high voltage supplies will only put out less than 10
milliamps. I`ve found them useless for jacobs ladders, but they can be used
for operating short lengths of neon tubing. They really only work well with
green tubing of small diameters, like the kind used in beer signs. For a
Jacob`s ladder, try using an ignition transformer from an oil furnace.

----rob
From: bill@hacktic.nl (Bill Squire)
Newsgroups: sci.electronics
Subject: Re: Life after CDs
Date: 25 Jul 92 19:57:33 GMT
Organization: Hack-Tic Magazine

curt@oasys.dt.navy.mil (Curt Welch) writes:

> In rec.audio, jsimon@rchland.vnet.ibm.com (Gerald Simon) writes:
> >This may sound stupid but, when I look at the back side of a CD (the side
> >the music is on), the light reflected back in the first part of the CD
> >(usually less than 1/4 inch from the outside) differs from the light reflect
> >back from the rest of the CD.  I've always assumed that's the portion of the
> >where the music is recorded.  If that assumption is correct, than there is
> >a LOT of space left over for additional music over the rest of the CD....How
> >wrong am I?
> 
> Only a little.  CDs are backwards from LPs.  They start in the center and wor
> outwards.  The small outer section is the blank part, the large inner section
> is the music.

 An additional question.  Do CD's ever contain tracks that are not in the
 directory?  There are allways copyright disputes when it comes to music
 and it sounds convienent if one should come up at the last minute to
 delete it at the directory level, but leave it on the disc, since all
 consumer machines would not know of it.  I also see the possibility of
 special "bonus cuts" just for hackers.  Does anybody know of any tracks on
 any CD's that are there but not playable on a consumer player?

                                                        Bill
Newsgroups: sci.electronics
From: srgxnbs@grv (Bruce Spedding)
Subject: Re: 8051 help needed urgently!
Reply-To: srgxnbs@grv
Organization: DSIR, Lower Hutt, New Zealand.
Date: Thu, 30 Jul 92 21:05:31 GMT

In article <1992Jul30.070338.6778@uwm.edu>, pegasus@csd4.csd.uwm.edu (David R Hucke) writes:
>
>Hi everybody!
>
>Well I finally got my 8051 compatible micro-controller in the mail
>and got it all wired with a crystal and MAX232 chip and reset hardware.
>
>I was able to invoke the onboard serial program load mode and load a
>program on the chip...
>
>The program simply set a bit on a port...
>
>I had an LED hooked up to port 1 pin 1 with a resistor and connected to
>ground like this:
>
>               |
>	       |  Port 1 Pin 1
>	       |
>	       LED
>	       |
>	       ^v^v^v  150 ohm resistor
>		    |
>	            |
>		    GND
>
>So my first program was this:
>
>setb P1.1  ;; Set Port 1 Pin 1 to 1  
>
>This turned on the LED as expected...
>
>Now my second program was this:
>
>clr P1.1  ;; Set Port 1 Pin 1 to 0
>
>This should have turned off the LED.. It did not turn off the LED... In fact
>nothing I do turns the LED off...
>
>Anybody have any idea what is going wrong?
>
>When I go into Serial Load mode (RST goes low) the LED still on also.
>
>Any help would be appreciated...
>
>
>-- 
>pegasus@csd4.csd.uwm.edu                David R. Hucke
>                                        UW-Milwaukee Film Major
>--

look at the 8051 spec sheet:
1. the outout is an active low not high
2. even if you wire it up with a resistor to +5V you'll probably still
be exceeding the pin rating.

- buffer your output with some 4049/4050 devices, you can wire LEDs from
+5V to the o/p of these w/o resistors as they self limit.

Bruce Spedding
Materials Science and Performance
Industrial Research Ltd,     Fax: +64-4-569-0132
P.O.Box 31310,              Work: +64-4-569-0485
Lower Hutt,  ( NZST : +12 ) Home: +64-4-562-8522
New Zealand.  Internet: srgxnbs@grv.grace.cri.nz  
Newsgroups: sci.electronics
From: howardr@col.hp.com (Howard Rebel)
Subject: Re: PC masks from a laser printer??
Date: Tue, 28 Jul 1992 14:46:18 GMT
Organization: HP Colorado Springs Division

In article <12977@chalmers.se> dana@me.chalmers.se (Dan Andersson) writes:
>MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham) writes:
>: Dear Knowledgeable ones,
>: Up until now I have made my PCB's using donut and tape transfers on
>: overhead proj film, exposing Electrolube +ve resist on the copper.
>:.....

Everything I have see so far is either expensive or hit and miss.

Mussings follow.

When used with a laser printer paper will pick up more tonner then plastic
and makes for a denser mask.  I used a very light cardboard stock.
To remove the paper I soaked it in water for a few hours and then
rubbed the stock with my fingers to remove the fibers not attached
to the mask.  When I finished the mask still had paper fibers stuck
to it but it etched ok.  I rubbed a bit to hard and pulled of some of
the mask.  Still a bit on the iffy side but I think it shows prommise.

If anyone knows of a better way to get rid of the paper we might have a
process that is not hit and miss.  One thing I did not try was burning
the paper.  Perhaps if the paper and board were baked in an oven the
paper would turn to carbon and could be washed away.  I am not sure if
it would ruin the mask.




-- 
Howard Rebel hpcsos.col.hp.com 

Newsgroups: sci.electronics
From: iisakkil@lesti.hut.fi (Mika Iisakkila)
Subject: Re: Life after CDs
Organization: Helsinki University of Technology
	<3664@wzv.win.tue.nl> <1992Jul27.212455.18334@ole.cdac.com>
Date: 29 Jul 92 13:48:44

ssave@ole.cdac.com (Shailendra Save) writes:

>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?

A good idea, but it is already implemented in the CD system...

--
Segmented Memory Helps Structure Software
Newsgroups: sci.electronics
From: pegasus@csd4.csd.uwm.edu (David R Hucke)
Subject: 20 Bit Counter?
Originator: pegasus@csd4.csd.uwm.edu
Organization: Computing Services Division, University of Wisconsin - Milwaukee
Date: Tue, 21 Jul 1992 23:32:28 GMT

Hi everybody!

I am working on a project where a 20 Bit counter would be a great thing
to have.

Does such a beast exist?

What I would like to be able to do is increment/decrement the counter
by putting a pulse on a pin and sending the resulting 20 bit number to
20 pins.

What I am trying to do is access 1 MByte of memory with a micro-controller.
Since the controller only can access 64K I figured I could use a 20 bit
counter.  I will only be accessing the memory sequentially anyway, so the
counter bit would work perfectly..

BTW:  If a 20 Bit counter does not exist, how would one go about building one?

THank you.

===
pegasus@csd4.csd.uwm.edu

-- 
pegasus@csd4.csd.uwm.edu                David R. Hucke
                                        UW-Milwaukee Film Major
--
Newsgroups: sci.electronics
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: Re: Fry the Monkey
Organization: The World
Date: Wed, 29 Jul 1992 06:57:53 GMT


In article <1992Jul28.154422.41939@kuhub.cc.ukans.edu> wellison@kuhub.cc.ukans.edu writes:
   monkey's brain. Now I can see a monkey bouncing off the side of the cage
   because a diagnostic cranked the voltage up ! ! Like I said, I don't know if I
   believe this story, but knowing some of the FE's, I wouldn't put it past them
   either ;-) Any old time DEC FE's out there that have heard this story ?


When I was at DEC, I heard a continuation to this urban legend. Apparently
this accounts for the admonition "Always mount a scratch monkey" 
(as in "scratch disk"). 

/ 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: gibbon@odie.ee.wits.ac.za (George Gibbon)
Newsgroups: sci.electronics
Subject: Re: Problems with 8031 Serial Port
Date: 31 Jul 92 14:09:50 GMT
Organization: Wits Electrical Engineering (Novell Users).

In article <1992Jul29.224236.26128@dcc.uchile.cl> pchris@dcc.uchile.cl (Chris Perleberg) writes:


>We're having problems with the serial port on a 8031.  We're programming the
>serial port in mode 1, frame of 8 bits, taking the baud rate from the chip
>clock (3.6864 MHz) and dividing it by Timer1.  Unfortunately, the baud rate
>of the transmitted characters never changes no matter what value we put in
>the hi byte of Timer1, TH1.  The baud rate that we receive is about 14,700
>baud.  Anyone have any ideas as to what may be going on?

>Thanks,
>        Chris Perleberg
>        pchris@dcc.uchile.cl

TL1 SHOULD BE SET TO THE SAME VALUE AS TH1 FOR THE AUTO-RELOAD
 
GOOD LUCK
  George Gibbon
  gibbon@odie.ee.wits.ac.za
Newsgroups: sci.electronics
From: medin@catbyte.b30.ingr.com (Dave Medin)
Subject: Re: sources for Japanese type semiconductors?
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Date: Wed, 22 Jul 1992 22:35:12 GMT

In article <kJs8NB1w164w@netlink.cts.com>, dmackie@netlink.cts.com (Dave Mackie) writes:
|> Does anyone have suggestions for, or pointers to, sources for
|> Japanese type (2SA, 2SB, 2SK, etc) semiconductors?

Generally, MCM (1-800-543-4330), Fox, and Consolidated Electronics
(I don't have their 800 numbers here) are good first-string sources.

-- 
 --------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    Intergraph Corp.				(205) 837-1174 (h)
       M/S GD3004
  Huntsville, AL 35894 		Internet: medin@catbyte.b30.ingr.com
				UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
Xref: sparky sci.electronics:13442 sci.materials:560 sci.physics:11814 sci.engr.chem:387
From: snyder@henry.ece.cmu.edu (John Snyder)
Newsgroups: sci.electronics,sci.materials,sci.physics,sci.engr.chem
Subject: Re: PZT Excitation
Date: 28 Jul 92 07:59:37 GMT
Organization: Physics Department, Carnegie Mellon University

In article <1992Jul27.204614.5646@fs7.ece.cmu.edu> snyder@henry.ece.cmu.edu (John Snyder) writes:
>In article <1992Jul27.185909.19949@pbhyg.PacBell.COM> rhsomer@PacBell.COM (Bob Somers) writes:
>> Is there any material that acts as an insulator
>>from magnetic forces?  I was told some time ago
>>that there is none, but perhaps some new material
>>will do this.
>>	Bob Somers, Pacific Bell, 510-823-9010
>>
>
>
>It depends on what you mean by "insulator from magnetic forces".  Do you mean
>a material that itself is unaffected by magnetic fields?  In this case, use
>a material that is a diamagnet.  Find a table of magnetic moments at some 
>temperature as near as possible to the temperature at which you will be 
>operating.  Fused silica is a material that has quite a low moment.  If you
>can tolerate a very small force, you can also use materials that are 
>paramagnets (in general, any metal or alloy that does not contain Co, Ni, or
>Fe, although there are surely plenty of exceptions to this).
>
>If instead, you are trying to find a material that will shield neighboring
>material from magnetic material, then you want a soft magnetic material with
                        ^^^^^^^^
Sorry, this word should be fields.

>very high permeability.  Permalloy is a common one.  Getting the coercivity 
                          ^^^^^^^^^
Actually, I meant mu-metal here, but permalloy might also work.  If you are
building a structure, mu-metal would probably be the material to try.  If
you are depositing a thin-film structure, Permalloy would be the material
of choice.

>low enough and the permeability high enough is difficult.  Bending or denting
>the material seriously degrades the performance.  If you are making a 
>shielding structure, you will want to construct it into final form *FIRST*,
>then give it its final heat/annealing treatment. And treat it carefully
>after the final annealing treatment.
>
>Another possibility, if you can operate at cryogenic temperatures,
>is to use the Meisner effect of superconductors to shield you.  Or
>another possibility is to use a superconductor at cryogenic temperatures
>to shield neighboring material which is at a different temperature.
>
>Hope this helps
>
>John
>snyder@henry.ece.cmu.edu

Hope I haven't caused too much confusion here.

John
snyder@henry.ece.cmu.edu
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: aldavi01@draconis.spd.louisville.edu (Arlie Davis)
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
Organization: University of Louisville
Date: Mon, 27 Jul 1992 20:05:02 GMT

In <1992Jul27.182147.1332@portal.vpharm.com> dap@portal.vpharm.com (David A. Pearlman) writes:

> This isn't the first time Polygram has taken an offbeat road to promote
> their artists. Around 1980, they issued a couple of promo-only samplers
> (vinyl LP's) that played from the inside-out (more recently, Capitol took
> the same route and issued a 12" EP by the group School of Fish that played
> from the inside out). 

One of Monty Python's albums (Matching Tie and Handkerchief, I think it
is called) has *three* sides.  One side is normal, and one side has two
grooves.  Depending on where you start the needle, you get one of the
two tracks.


-- 
lrwx------   1 aldavi01 emacsstu       9 Jun  6 12:43 .signature -> /dev/null
Newsgroups: sci.electronics,rec.audio
From: dave@imax.imax.com (Dave Martindale)
Subject: Re: Life after CDs
Organization: Imax Corporation, Mississauga Canada
Date: Sat, 25 Jul 1992 19:33:59 GMT

bill@bilver.uucp (Bill Vermillion) writes:
>
>then Sony and Philips got together and standardized on the
>current 12cm disk that sped'ed out at 74 minutes.

ptt00@DUTS.ccc.amdahl.com writes:
>Does anyone know for sure the absolute maximum playing time of CDformat ?
>
>I had always heard this 74 minute nonsense, then "Electric Ladyland" came
>out on one disc at 75:25. A couple years ago I got one by the Mexican
>band "Iconoclasta" that clocked in at 80:20.  What Gives ?

The CD standard specifies a nominal value for various parameters of
disk mastering, plus maximum and minimum values.  The linear velocity
is supposed to be some value, plus or minus a tolerance.  The track
spacing is also supposed to be something plus or minus a tolerance.
That's probably true for the width of the area containing music as
well.

If you set up your mastering lathe to exactly meet all the nominal
tolerances, you get 74 minutes of recording time.  But if you fudge
them towards on end of the limits, you can get more.  Dropping
the linear velocity gets more playing time, as does reducing the
track spacing.  The result is a disc that is still "legal", but
more difficult to play.  A CD player with marginal data separator
or servo system (either due to design or age) may not play this
CD reliably, while it will still play "normal" ones.
Newsgroups: sci.electronics
From: eric@telebit.com (Eric Smith)
Subject: Re: SHOCKING STORIES
Organization: Telebit Corporation
	<JNA.92Jul21031708@geech.gnu.ai.mit.edu>
	<1992Jul21.123111.12460@cunews.carleton.ca>
Date: 22 Jul 92 19:46:44

>>On Tue, 21 Jul 1992 12:31:11 GMT, dp@hydra.carleton.ca (Dave Perry VE3IFB) said:
> For those that don't know, a picture tube is a big capacitor, capable of
> storing charge for days. Watch it.

In fact, it'll store charge pretty much indefinitely, since after you
discharge it, it will start picking up a charge by itself.

____ALWAYS____ discharge CRTs before you do _anything_ with them.

Eric

From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 24 Jul 1992 19:02:47 GMT
Subject: Re: color LCDs
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics


> 
> Do any of you know about color LCD displays that are of VGA quality?
> I need as big of one as I can get my hands on.

Sure - there's a number of different suppliers making these.  As far
as "big", the upper limit on size right now is about a 11-12" diagonal.
They're also VERY expensive.  Contact the local rep or distributor for
Sharp Electronics, NEC, Epson, or Matsushita (Panasonic), for starters.

One additional note - in general, these do NOT accept video signals; you
will need to obtain a special interface card.

Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
From: re_sims@vax.muskingum.edu
Newsgroups: sci.electronics
Subject: Re: Amplifier for 25K Hertz...SKIP
Date: 25 Jul 92 00:22:16 GMT
Followup-To: sci.electronics
Organization: Muskingum College

In article <9952@sun13.scri.fsu.edu>, nall@sun8.scri.fsu.edu (John Nall) writes:
> Hi:
>      I wonder if someone could share a bit of knowledge with me?
> I haven't really fooled around with hands-on-electronics since
> my Heathkit and ham-radio days (about 25 years ago), so am not
> at all sure what sort of chips are available these days.
> 
>      What I have is a small box with a built-in speaker which
> emits a ~25K Hz (above the range us humans can hear) when I
> press a button.  The strength of the signal is very small.
> 
>      What I want to do is to amplify this signal and drive a
> larger speaker.  The way that I'd like to do it is to pull the
> signal which is now going to the built-in speaker off and direct
> it to an audio amplifier.  The output of the audio amplifier would
> then go to the larger speaker, with a variable control.  The
> maximum desired signal would be 10 watts.
> 
>      Back in the "good ole days" I'd have gone to my trusty ARRL
> manual, or something like that, and found a circuit for an audio
> board, and built it up with a transistor and variable resistor.
> I feel sure that there is probably a chip available to do the same
> thing, but don't know what it might be.  (I've asked in my local
> Radio Shack store, but the clerk there is not too bright.  She tried
> to instead sell me a hi-fi amplifer :-)
> 
>      Thanks for any help.  BTW, I'm guessing on the exact frequency
> of around 25K Hz, but it is around there somewhere (this device is a
> dog training device, and the sound emitted is at a doggy frequency.
> I need to extend the range).
> 
> John
> 
> --
> John W. Nall              | Supercomputer Computations Research Institute
> nall@mailer.scri.fsu.edu  | Florida State University, Tallahassee, FL 32306
>     "You cannot be a beacon, if yo' light don't shine!"  
>                                             - heard on the car radio...

Hmmmm John,

    10 WATTS, hope you don't have any neighbor kids with
Gerbels or hamsters within a couple of miles,
they may take a sudden interest in leaving home!!!!!!


    Might even drive a few wives to run off.


Jim N4JDP
Newsgroups: sci.electronics