HDTenEightyP/NetNews huggingface dataset:
From: jbore@pach.shearson.com (Joe Bore)
Subject: Re: Dolby Surround
Organization: Lehman Brothers
	<1992Oct13.071425.9752@megadata.mega.oz.au>
Date: Tue, 13 Oct 1992 21:14:15 GMT

yes, i think this would be of large interest


In article <1992Oct13.071425.9752@megadata.mega.oz.au> swanee@megadata.mega.oz.au (Geoff Swan) writes:

   > 
   > Does anyone have an idea how they encode multiple tracks on two stereo
   > tracks using Dolby Surround Sound encoding (Pro-Logic or otherwise)?
   > 
   > Derby Chang

   Yes, the technical details of Dolby (TM) surround sound are available
   in the Journal of the Audio Engineering Society, I'm not quite sure
   of the issue, but sometime over the last two years. If anyone is interested
   I can look up the issue and maybe even summarise the info on the net.

       Sla/n go fo/ill,
		       Risky B.
   --------------------------------------------------------------------------
   Geoff Swan (research & development)   _--_|\         swanee@megadata.oz.au
   Megadata Pty Ltd                     /      \ 
   2/37 Waterloo Rd, North Ryde,        \_.--._/               +61 2 805 0899
   NSW 2113, Australia.                       v          (Fax) +61 2 887 4847

--
-------------------------------------------------------------------------------
Joe Bore						|	         LEHMAN
jbore@shearson.com | ...!uunet!shearson.com!jbore	|	       BROTHERS
(212)464-3431, Beeper:  (212)396-4248			|	       --------
From: geb1@ra.msstate.edu (Granville Barker)
Newsgroups: sci.electronics
Subject: Max699 ( what is this for? )
Date: 9 Oct 92 17:25:49 GMT
Article-I.D.: Isis.geb1.718651549
Organization: Mississippi State University

I was just wondering what a MAX 699 IC is used for?

Thanks.
geb1@isis.msstate.edu
Newsgroups: sci.electronics
From: steveh@franklin.cc.utas.edu.au (Steve Howell)
Newsgroups: sci.electronics
Subject: Taking NMI,FIRQ and HALT to VCC Direct on 6809?
Date: 15 Oct 92 03:00:12 GMT
Article-I.D.: franklin.steveh.719118012
Organization: University of Tasmania, Australia.




	Can this be done.. can i take these signals directly to VCC with no
pull up resistors if i intend on not ever using them?...

i have the intention of direct linking VCC to HALT,DMA and FIRQ on the
6809..

will this cause any problems?


Thanks

Steve H
Newsgroups: sci.electronics
From: pinto@rbdc.wsnc.org (Mike Pinto)
Subject: credit card reader help needed
Organization: Red Barn Data Center Public Access Unix, Winston-Salem, NC.
Distribution: usa
Date: Tue, 13 Oct 1992 14:34:44 GMT


I recently ordered a credit card reader from an ad I found in Radio/
Electronics magazine. The reader is Model # AYT-MAP100-L01. This reader
came with almost no documentation; what little came with it explained how
to get it to read and display a credit card number. 

The unit has a "network" connector, which is a RS422 port. I'd like to
find a way to interface it to my PC, but I really haven't been able to
get the reader to do very much. I had someone read the EPROM and dump it
to a file, and from the text I can see that this thing has lots of options
and features that I am unable to take advantage of. I thought about trying
to disassemble the EPROM dump, but its written in Z80 assembly language,
and I am not familiar with that, plus, I don't have a disassembler for it.

What I would like to know is: does anyone out there know anything about
this card reader? Like how to access some of the features, who made it (
there's not even a manufacturer's name on it), anything at all that will
help me get started. I would appreciate any information at all on this
thing.

Thanks for any help...


-- 
=============================
Mike Pinto                  
pinto@rbdc.wsnc.org         
=============================
From: marken@aero.org (Richard Marken)
Newsgroups: sci.electronics
Subject: CCD Camera
Date: 16 Oct 1992 17:37:53 GMT
Organization: The Aerospace Corporation, El Segundo, CA
NNTP-Posting-Host: aerospace.aero.org

Does anyone know an inexpensive source for a black-and-white
small CCD camera? Low resolution is OK. Also any info on LCD
display for same would be appreciated.

Please send replies to me via e-mail. I'm posting this for a 
friend. I don't ususally read this newsgroup.

Thanks

Rick


     **************************************************************

Richard S. Marken                   USMail: 10459 Holman Ave
The Aerospace Corporation                   Los Angeles, CA 90024
E-mail: marken@aero.org
(310) 336-6214 (day)
(310) 474-0313 (evening)
From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Re: Help with my scope!
Date: 15 Oct 92 10:29:47 GMT
Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Organization: Dept Electrical and Electronic Eng, Manchester University, UK

In article <1992Oct13.124459.19921@yang.earlham.edu> irac@yang.earlham.edu writes:
>Hello, I need a little help with scope problems.
>I have an older 50mhz Hewlet Packard Scope. It seems to be having some trouble
>with the focus. The only time that this happens is when I have it set on XY and
>watching the two channels of my stero. What seems to happen is when I have the
>Horizontal Scale knob set to greater then .2 mv per cm it is focused fine.

Vertical surely? - Horizontal scale is a time eg 2ms/div.

>However as soon as I click the knob one over to the left to increase the scale,
>the focus goes away and I get a fuzzy double line for everything.

.2mV/div is a pretty sensitive scale, so I assume that the next one
is .1mv/div, and is the most sensitive available (or nearly so).
If all these assumptions are true, then the problem is not with the
focus, but high frequency noise, either being picked up externally or
generated in the Y-amps themselves. Test this by winding your timebase
up to a very fast speed, the fuzz should resolve itself as a waveform.

>anything. I have a temp fix that seems to work by putting a small cap between
>the Horizontal input and the ground.  

This substantiates my theory, since the cap would filter high frequencies
out of the signal. It also lets your scope off the hook, since the noise
must be coming from an external source. Make sure your leads are properly
screened ans grounded, or buy a better stereo.

> Also the focus seems to get worse to the right of the screen. This could
> be my own fault with the astigmatism.

That's life in the big city.

>	The whole deal is not too imporant as I only have the scope hooked up
>so I can watch the songs I play on my stero

what a waste :-)

>is sharp and I sometimes use the scope on people's guitars and my own circuits.

OK let you off.

>Thanks very much for your time.

No problem.

>-ira

>/{E-mail for questions about it all to IRAC@yang.earlham.edu}?
>/{You mail me.. I ask you questions. Eat a lollipop Mary.   }?

Mark
--
_____________________________________________________________________
Multimedia Information Systems Lab | Wanted: witty one line 
Dept. Of Electrical Engineering    | computer jokes to fill this
University of Manchester           | space : mail me - no fortunes
Dover St. Manchester. M13 9PL      | please.
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Voice-operated Universal Remote Control
Date: Tue, 13 Oct 1992 18:39:51 GMT
Organization: U of Toronto Zoology

In article <1992Oct13.152506.3101@venice.sedd.trw.com> gay@venice.sedd.trw.com (Lance Gay) writes:
>I just heard an advertisement on the radio for a voice-operated universal
>remote control.  The sample in the advertisement was to speak the words
>"RECORD CHANNEL 2 SUNDAY 9 P.M. TO 11 P.M.", which would set your VCR
>to record a movie...

Careful... unless somebody's made a breakthrough, such devices typically
have either a high reject rate ("huh? sorry, I didn't catch that") or a
high error rate ("you say you want me to turn the toaster on at 3AM?").
They're toys, not practical appliances.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Need telephone #'s for Phillips and Sanyo
Date: 11 Oct 92 22:10:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 I have a old Phillips receiver and Sanyo tape deck that Im repairing
for a friend. I need the telephone numbers of their customer service
departments. I would appreciate any help

      Neil Gandler
Newsgroups: sci.electronics
From: phaf@giraffe.ru.ac.za (MR A FERREIRA)
Subject: Re: Need help choosing an MCU
Organization: Rhodes University, Grahamstown, South Africa
Date: Tue, 13 Oct 1992 07:28:12 GMT

In article <92281.230831DI3QC@CUNYVM.BITNET> <DI3QC@CUNYVM.BITNET> writes:
>Subject: Need help choosing an MCU
>From: <DI3QC@CUNYVM.BITNET>
>Date: Wednesday, 7 Oct 1992 23:08:31 EDT
>I have just started working with mcu's and I need help searching 
>for one with some of these characteristics. I would like an EEPROM area of 
>8K greater would be good, also 256-512 bytes of ram and about 32 I/O lines 
>and a serial cpnnection to connect to an RS232 port. Any Ideas and help 
>would be welcomed. Thanx
>
>
>                                                  Alex Jeannopoulos
>
I used the Dallas DS5000T a while back. This chip has a 8 or 32k 
EEPROM, 4 x 8 bit ports one of which has as other uses (for 
eg.  programmable serial port.) They run at either 8 or 16 MHz (I think).
The DS5000T has a real time clock, a watchdog timer and all sorts of useful 
goodies built in. The DS5000 series is based on the INTEL MCS51 set of 
micros so there is tons of software and reading matter for them.
The reason i chose the Dallas chip was that it made a very cheap and easy 
development system. All one needes is a serial driver chip, a PC running 
some terminal emulation program and some bits of wire and you have a working 
system (A bit of software for the chip would be useful aswell :-) )
 
There is a lot more to this chip, I just can't remember it all.

Hope that helps
Andre
From: btm@mdavcr.mda.ca (Blair Mackiewich)
Newsgroups: sci.electronics
Subject: Help! How can I talk to my Sharp?
Date: 16 Oct 92 00:32:54 GMT
Organization: MacDonald Dettwiler, 13800 Commerce Parkway, Richmond, BC, Canada  V6V 2J3

I recently received a Sharp ZQ-2200 Electronic Organizer as a gift. It has a
serial interface port for communicating with other Sharp organizers. Sharp does
not support a PC interface for this particular model, so I'd like to build
one.

Apparently the port supports standard asynchronous serial communications -
1200 baud, no parity, 1 stop bit. A simple CMOS to RS-232 level conversion
circuit should provide the hardware interface required for a PC connection.

I cannot, however, find any information regarding the protocol used by Sharp
for communicating between these organizers.  

I would appreciate any info anybody can provide regarding the protocol...
Literature, a contact at Sharp, an ftp site, anything!  So far I have come up
empty handed.

Thanx in advance!!!!!
Blair

-------------------------------------------------------------------------------
Blair Mackiewich					MacDonald Dettwiler
Systems Engineer					13800 Commerce Parkway
Email:	btm@mda.ca					Richmond, B.C., Canada
or	uunet!van-bc!mdavcr!btm				V6V 2J3
-------------------------------------------------------------------------------
* 	Opinions expressed herein are my own and do not necessarily reflect the
	views of MacDonald Dettwiler
-------------------------------------------------------------------------------


Newsgroups: sci.electronics
From: jvp@juliet.ll.mit.edu ( Jim Pieronek )
Subject: Ultrasonic humidifier failure modes?
Organization: M.I.T. Lincoln Lab - Group 43
Distribution: usa
Date: 10 Oct 92 23:56:55

I have several ultrasonic humidifiers that have bit the dust.  They
all ran for quite a while (several months to a year or two) and then
exhibited reduced vapor output.  Taking a peek inside verifies that
the little squirt of water above the transducer is still there, but a
lot smaller than when the unit was new.  The circuitry is usually
quite simple - a power supply and a one transistor oscillator.

I haven't had a chance to put a scope on one of these things yet, so I
thought I might find out if any of you network geniuses have fiddled
with them and can give me a hint for what to look for.  My questions:

1.  Is there a common failure mode that these units experience?

2.  Do the transducers go "bad" after a while?

3.  Are the transducers resonant devices that don't work well if they 
    are driven at a frequency that does not match their natural
    frequency?  Do I need to adjust the oscillator frequency?

4.  Where does one get replacement transducers?  It recall that 
    a surplus outfit called Herbach & Rademan (sp?) used to sell 
    transducers, but they may have been for hydrophones, not
    humidifiers.  Does anyone know of any others?

My wife, who has just had some sinus surgery, is anxiously awaiting
your replies.

- Jim
--
-----------------------------------------------------------------------
J.V. Pieronek                           Internet: jvp@ll.mit.edu
M.I.T. Lincoln Laboratory               (617) 981-3468
Lexington, Massachusetts  USA
Newsgroups: sci.electronics
From: walvdrk_r@research.ptt.nl (Kees van der Wal)
Subject: Re: fluoresent lighting
Organization: PTT Research, The Netherlands
Date: Sun, 11 Oct 1992 14:36:10 GMT

In article <718623068.4@mailbox.bison.mb>, Jason.Goga@mailbox.bison.mb.ca
(Jason Goga) writes: 

> In chemistry class the teacher was illustrating flouresent lighting, and
> explained that the charge caused the electrons to leap into higher energy
> levels, however not being able to sustain them they would fall back down
> realeasing energy as light. Now I ... 

[The original texts has been truncated here by the VMS editor because it sees
the entire paragraph as a single and too long line] 

It's a 3-step process. 

1) The high voltage between the ends of tube cause a stream of electrons 
rushing from one end to the other.

2) The rushing electrons collide with the gas inside (Mercury?). The electrons 
belonging to the gas are excited to higher energy levels. As this is an 
unstable situation the electrons "fall down" to a stable position, emitting a 
foton. This light is not very useful as it is very blue and contains a lot of 
UV radiation.

3) The UV radiation hits the phosphor at the inside of the tube. I don't know
how it is done but a similar process in the phosphor "converts" the mainly 
invisible radiation into visible and useful light. The type of phosphor 
determines the colour of the light emitted by the tube.

Wheter the tube runs from DC or AC doesn't matter; it only has effect on the 
first step. If the voltage is too low to operate a tube, the most common way is 
to convert it to AC and use a transformer. There's no need for a rectifier 
afterwards but I can seen no harm in using one.

Regards, <kees>
From: Robert_La_Ferla@hot.com
Newsgroups: sci.electronics
Subject: HELP: Need List of  LED Manufacturers
Keywords: LED
Date: 13 Oct 92 20:55:33 GMT
Article-I.D.: hot.1992Oct13.205533.4592
Reply-To: Robert_La_Ferla@hot.com
Organization: Hot Software

Hello.

I am looking for a list of manufacturers of LEDs with the following  
characteristics:

*	panel mounted
*	5/32" and 1/4" diameter
*	green
*	black nylon housing
*	wire leads 24/26 awg
*	built-in resistor for 5V (preferable but not necessary)

We have been using Linrose Electronics but have found them to be a  
difficult, unreliable and hostile company to work with.  I strongly  
discourage other readers of sci.electronics not to purchase from them.

Please e-mail.

Thanks in advance,
Robert La Ferla
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: flouresent lighting
Date: 08 Oct 92  15:11:49 CST

YO!

In chemistry class the teacher was illustrating flouresent lighting, and explained that the charge caused the electrons to leap into higher energy levels, however not being able to sustain them they would fall back down realeasing energy as light. Now I was curious, I've never seen a flouresent light run from DC. so is it the constant returning to 0 volts that causes the electrons to fall back down or do they do so on their own accord?

-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
From: an938@cleveland.Freenet.Edu (George II Lenzer)
Newsgroups: sci.electronics
Subject: CD vs. CD-ROM
Date: 9 Oct 1992 03:59:01 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc4.ins.cwru.edu


	What are the differences between a CD player and a CD-ROM
device?  Putting the SCSI interface and controller mechanisms
aside, is the reading done in a similar fashion?
BIG DUMB QUESTION:  How much work would be involved in trying to
"convert" a CD player to a CD-ROM?  Probably very difficult if not
next to impossible.

						George II Lenzer

-- 
"I'll let you in on a little secret.
	The whole universe is totally INSANE!!!!"
						Mr. Natural

Newsgroups: sci.electronics
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Subject: Re: Thunderstorms
News-Software: VAX/VMS VNEWS 1.41    
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
Distribution: na
Date: Wed, 7 Oct 1992 23:52:00 GMT

In article <1992Oct7.190330.13523@cbfsb.cb.att.com>, feg@cbnewsb.cb.att.com (forrest.e.gehrke) writes...
>In article <1992Oct7.152434.11480@col.hp.com> cab@col.hp.com (Chris Best) writes:
>This should be a reminder to people with PC's.  So many have
>surge protectors in their power line to the PC but fail to
>put one on the phone line (if connected to a modem as part
>of the PC installation).  Via the phone line there is a more
>direct path into the expensive innards of the PC, such as
>the motherboard, than there is via the power line.  The latter
>is more likely to destroy something in the switching DC power
>supply--probably less than a $100 cost.

	One other point. A nearby strike will inductively couple the same
	amount of energy into your power and phone lines. However, your
	power line has a lot of things connected to it to absorb the energy.
	Your telephone line doesn't.

	As a kid, I summered in Michigan and knew some friends with a hous
	way out on a point of land, the last ones on the tail end of a LOOOONG
	power line and phone line run.

	They never had anything on the power line burned out by a power surge
	due to lightning, but the phone guys got so tired of running out to
	their house and changing the fuses at the phone junction box that they
	just showed John were the fuses were, gave him a bag full, and said
	"when you run out, just stop by our office and we'll give you more."
	(This was in the days of mechanical phones, so not much on them would
	blow, but I think once or twice his phone did get fried, even despite
	the fuses.)

   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   | |_) _   
                                   | \|_)  Water, taken in moderation, cannot
    "Birthplace of Softball"          |_)  hurt anyone. - Mark Twain
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: electron orbitals
Date: 08 Oct 92  15:16:30 CST

I was in chem class the other day (as usual) and we were discussing the various shapes of orbitals at the various energy levels of electrons. Now we discussed S, P, D, and F. However no 3d picture of an 'F' orbital was given. I was wondering if such a plot exists and if so can I get a copy.

ALSO, the S orbital is symetrical, so is the P. However in 3dx2 there is this 'dougnut' shaped orbital, whereas it's counterparts are ovalish. Why is this?

-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
Newsgroups: sci.electronics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: Sam's Photofacts
Originator: sehari@vincent1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Thu, 8 Oct 1992 18:43:06 GMT

In <BvtAFx.HLo@ais.org> danr@ais.org (Daniel Romanchik) writes:

>Does anyone still publish Sam's Photofacts?

>If so, who?  How can I contact them?

>Thanks, Dan

Sam is a name of publishing company itself.  You probably heard of computer
books that published by Sam.  Now call 1-800-555-1212 and ask for their
800 number.

Better yet, go to your local library they might have it, too. I know, they
have them in Fresno County Library, off course not all of them.

                          With highest regards,
                               Babak   Sehari.
-- 
Newsgroups: sci.electronics
From: danr@ais.org (Daniel Romanchik)
Subject: Sam's Photofacts
Organization: UMCC
Date: Thu, 8 Oct 1992 16:43:07 GMT

Does anyone still publish Sam's Photofacts?

If so, who?  How can I contact them?

Thanks, Dan
From: dplatt@ntg.com (Dave Platt)
Newsgroups: sci.electronics
Subject: Re: new PIC microcontroller
Date: 12 Oct 92 18:56:57 GMT
Organization: New Technologies Group, Inc.  Palo Alto CA

In article <BvvAw9.31@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:

>The real question is:  are the programming specs in the datasheet?
>
>It's really quite irrelevant how many wires are involved if you have
>to buy a commercial programmer anyway.

I spoke with a Microchip representative at the Embedded Systems
Conference a couple of weeks ago, and raised the issue I'd read about on
the Net:  that Microchip seems to keep its programming specs proprietary
rather than publishing them.

His response:  "No, that's not true.  It's true that we don't include
them in the data sheet.  Often, the data sheets are printed up before
the actual production runs of the parts.  Once we're actually in
production, and have had a chance to test the programming algorithms
with the real parts, we're quite willing to provide this information
upon request.  All you need to do is call us.  I wonder if you could
distribute this information for me, the next time the issue comes up."

So... there you have it.

And... yes, the preliminary data sheet for the 16C71 (DS30150B) does
describe the serial programming protocol - it's on pages 54 through 56.
The parallel programming writeup is in a separate document (DS30153).
-- 
Dave Platt                                                VOICE: (415) 813-8917
              Domain: dplatt@ntg.com      UUCP: ...netcomsv!ntg!dplatt
 USNAIL: New Technologies Group Inc. 2468 Embarcardero Way, Palo Alto CA 94303
Newsgroups: sci.electronics
From: fmathews@norfolk.vak12ed.edu (Frank Matthews)
Subject: FM Receiver Project Plans?
Organization: Virginia's Public Education Network (Norfolk)
Date: Sun, 11 Oct 92 01:40:28 GMT

I am an electronics teacher in a high school.  I am always on
the lookout for fresh project ideas for the students to build.
I felt that a simple fm receiver capable of picking up the
local police, fire, or rescue would be fun and interesting to
make.  I thought that it might even generate some interest in
the 2 meter ham band as well.  If anyone has any schematics or
plans for such a project...I would appreciate hearing from
you.  Even if it is not a tunable circuit (such as a crystal
controled frequency) that would be fine. I found a kit through
Ramsey electronics, but as you know....schools are on a tight
budget.  Thanks,
		Frank Matthews
		Indian River High School
		Chesapeake, VA  23325
From: qlg0228@uxa.cso.uiuc.edu (Quing  Lu)
Newsgroups: sci.electronics
Subject: Looking for info.
Date: 13 Oct 92 20:36:57 GMT
Article-I.D.: news.Bw2uLM.81C
Organization: University of Illinois at Urbana

We have two pulse generators from E-H international Inc., Oakland, CA
and we don't have any manuals for them. Has anyone heard of this company
(i.e. are they still in existence?), if so,  do you know how we could
get hold them?

Specifically, we are looking for manuals for model 1560 and model 1564
Programmable Pulse Generators. If there is anyway you can help us, please
send a note to this account. (I don't read this group regularly.)

Thank you for your time and effort.

Jean Lu
Newsgroups: sci.electronics