HDTenEightyP/NetNews huggingface dataset:
From: msunde01@mik.uky.edu (Mark  Underwood)
Subject: Re: PC on a chip
Reply-To: msunde01@mik.uky.edu
Organization: University Of Kentucky, Dept. of Math Sciences
Date: Tue, 26 Jan 1993 23:02:16 GMT

In article <C1FpoK.MnI@lysator.liu.se> pell@lysator.liu.se (P{r  
Emanuelsson) writes:
> I've heard of a "PC on a chip" - could anyone tell me who makes these?
> 
> --
> Lysator Computer Society			      pell@lysator.liu.se
> University of Linkoping, Sweden	                  
..!uunet!lysator.liu.se!pell


Cyrix

	They just recently (last year?) came out with a complete (?) 8086  
computer on a chip at about the same time they announced their 386sx and  
386dx clone chips.  I don't know any details, really.  Just remember  
seeing a sideline in a Computer Shooper article re: the chip wars between  
Intel, Cyrix, and AMD.  You may want to contact Cyrix (address???) for  
more info . . ..

 
--
Mark Underwood
EE Student, University of Kentucky
Lab Assistant, Boyd Hall Microlab 
	(a tiny little division of UK Library Microlabs)
E-Mail:  msunde01@mik.uky.edu
Newsgroups: sci.electronics
Subject: Looking MS-Windows Based Design Software
From: matt@eagle.wesleyan.edu (Matt Tidgewell)
Date: Mon, 25 Jan 1993 20:04:26 GMT
Organization: Wesleyan University, Middletown, CT USA

I'm using DesignWorks software for the Mac.  It seems OK to me, but I hate 
macs.  Does any one know of a good schematic drawing program,  it would also 
be nice if it did digital simulation.  I've heard of SPICE, but that seems 
to be an Analog simulation program.  Please post replies.

Matt Tidgewell
MTIDGEWELL@EAGLE.WESLEYAN.EDU
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: hard disk orientation
Date: 26 Jan 93 20:02:15 PST
Organization: Kernel Mode Systems, San Diego, CA

In article <1k3u2qINNp5@coral.bucknell.edu>, jraup@coral.bucknell.edu (Raup II James R) writes:
> In article <C1GHnF.DGL@dcs.ed.ac.uk> gst@dcs.ed.ac.uk (George Taylor) writes:
>>Could anyone tell me if running a hard disk vertically instead of horizontally
>>(e.g.using a desktop machine on it's side like a 'tower' system)
>>is likely to decrease it's lifetime?
> 
>  I'd check the manufacturer's specs. The manual I got with my Seagate(tm)
> (157n SCSI) states that any orientation is acceptable EXCEPT Circuit
> board up (Daughterboard up). I'm not sure if this is applicable to other
> manufacturers, though. This is an older drive (3 1/2 yrs), but new
> enough to have auto-park (heads) on power-down..

The manuals I've gotten with several Wren drives (formerly CDC, now Seagate)
gives a couple of recommended orientations.  Nothing that precludes "using a
desktop machine on its side like a 'tower'".  (Either side.)

However, they also state that the drive should be used in the same orientation
in which it was formatted.  This appeals to my common sense.  

otoh a friend of mine who does system integration (and probably deals with more
drives in a week than most of us do in a year) says that he's never found that
this matters. 

Nevertheless, it can't hurt to follow this rule, especially with an older drive
whose positioner tolerances may not be as tight as they used to be. 

	--- Jamie Hanrahan, Kernel Mode Systems, San Diego CA
Internet:  jeh@cmkrnl.com, or hanrahan@eisner.decus.org  Uucp: uunet!cmkrnl!jeh
Newsgroups: sci.electronics
From: Clive.Nicolson@bbs.actrix.gen.nz
Subject: Infrared Laser Diodes for data links
Organization: Actrix Information Exchange
Date: Fri, 29 Jan 1993 01:37:48 GMT

I am looking for specs. on infrared laser diodes, about 820nm with
approx. 20mw output, which are capable of being modulated at
10 to 20 megabits/sec.

I believe a US firm called III-V (roman numerals 3-5) [formerly (a
division of) Fairchild semiconductor???] has a range of these devices.

I need details to enable me to contact manufacturers of such devices, ie
mail address, phone or fax numbers.
From: baden@bbs.draco.bison.mb.ca (Baden de Bari)
Newsgroups: sci.electronics
Subject: *] DEVRY INST. INFO WANTED [*
Date: Tue, 26 Jan 1993 05:20:41 GMT
Organization: The Draco Unix System [BBS]

 
                I'd like to get in contact with anyone who has or is 
attending any DeVry Institute facility.  I'd also like to know if it is a 
nationally recognized facility.
 
                Thanks.
 

-----------------------------------------------------------------------
"For God's sake Jim, I'm a musician, not a physician" /\/\/\/\/\/\/\/\/
baden@bbs.draco.bison.mb.ca ]\
baden@sys6626.bison.mb.ca   ] |> ] Baden de Bari [    ................
baden@inqmind.bison.mb.ca   ]/                        \/\/\/\/\/\/\/\/\
-----------------------------------------------------------------------
 


---
baden@bbs.draco.bison.mb.ca (Baden de Bari)
The Draco Unix System [BBS]

Newsgroups: sci.electronics,sci.eng
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Car alarms
Organization: Motorola Computer Group, Tempe, Az.
Date: Fri, 22 Jan 1993 12:32:02 GMT

In article <C15q3p.Bo4@fs7.ece.cmu.edu> jts@ginny.ece.cmu.edu (John T. Stonick) writes:
>Hello
>
>I recently had the wheels stolen off of my truck and I am thinking of
>getting an alarm system.  I would like to know what types of features
>are useful, and which are wasteful.  I already have an engine disabler
>in my truck so I am looking for something to use in conjunction with a
>disabler. I am also interested in any brand reccomendations or warnings.
>

Sure I can suggest a brand, Chevy. As in a 1972 Chevy Luv pickup with dirty and
slightly rusted white spoke wheels. It'll never be touched. :-)

What is a "disabler?" I presume it's an ignition cut-off device. (I've
got one in every car)

The punks in my neighborhood are pretty easy to scare off. I installed
small transmitters in my cars connected to those motion sensing things
sold for car alarms. A receiver in the house turns on three quartz flood
lights providing instant day-time for anybody screwing with the cars.
I also put a sonalert in the engine compartment of each car also connected
to the motion switch both as a deterent and so I can tell which car is
turning on the lights in the event of a problem.

This system also provides the 'turn on the lights when you drive up'
function. 

Good luck,
John



-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
From: gale@cps.msu.edu (Kristopher W Gale)
Newsgroups: sci.electronics
Subject: HELP PLEASE!!!
Date: 23 Jan 93 04:04:29 GMT
Reply-To: gale@cps.msu.edu (Kristopher W Gale)
Organization: Dept. of Computer Science, Michigan State University
NNTP-Posting-Host: atlantic.cps.msu.edu
Originator: gale@atlantic.cps.msu.edu


Does anyone know why a VCR would lock up its drive mech. for loading tapes.
It acts like it is stuck and will continue to try to return to normal 
upright position, stops and then goes into a reverse cycle. I tried to look
around to see if something was blocking it but couldn't find anything.
If anyone can help me please send me email.

Thanks in advance,

   Kris

-- 
Kris Gale				
(gale@cps.msu.edu)			"It's only a flesh wound."
126 E Wilson					-- Black Knight
E.Lansing, Mi. 48825				   Search for the Holy Grail
From: etobka@roland.etn.ericsson.se (Bjorn Karlstad)
Newsgroups: sci.electronics
Subject: EasyPC Print Circuit Layout Program for PC
Date: 26 Jan 93 16:07:37 GMT
Distribution: sci
Organization: Ericsson Telecom AS

Hi.

  Does anybody know where to find EasyPC or another good
PCB program for PC??????

Any help is welcome

Regards Bjorn Karlstad
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: CMOS PAL
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Wed, 27 Jan 1993 13:17:29 GMT

Claude Frantz (claude@bauv.unibw-muenchen.de) wrote:
: Hello !

: Does anybody known about PALs in CMOS technoloy, compatible with the 
: 4000 CMOS family, i.e. for supply voltage up to 15 V. ? I'm looking for 
: a part like the PAL24L10.


A dream (?):
------------

 ?????????????????????????????????????????????????????????????????????????
 ? More interessting is such as a GAL-device, a device you can clear and ?
 ? programm. A gal with a power-range of 3 volt until 15 volt, and a	 ?
 ? standby power current of max. any microamps. That's music!		 ?
 ?????????????????????????????????????????????????????????????????????????

Bye Thomas
Newsgroups: sci.electronics
From: doherty@coolpro.melpar.esys.com (Kevin Doherty)
Subject: Re: CMOS PAL
Organization: E-Systems, Melpar Division
Date: Thu, 28 Jan 1993 12:31:36 GMT

  I've used Cypress 22V10's up to 10 volts without toasting 'em, but I'm
not sure I'd recommend it if anything important depends on the part continuing
to work.....they're designed for 5 volt operation, and they have both flash
and UV erasable versions.
-- 
======================================================================
Kevin Doherty                                E-Systems/Melpar Division
doherty@coolpro.melpar.esys.com              Falls Church, VA 22046
Newsgroups: sci.electronics
From: michaet@hubcap.clemson.edu (michael dale townsend)
Subject: Re: Car Phones?
Organization: Clemson University
Date: Tue, 26 Jan 1993 14:21:23 GMT


All right, it finally made it to the news last night:	
"Portable cell phones (not car phones with external antennas) can give
you brain tumors."  I personally wouldn't hold a 3 watt transmitter next
to my head all day, but I think that the article tried to play on scare
tactics.  It was kind of like David Brodeaur's (sp?) _Currents of
Death._  Now everyone with bagphones and hand-held models are going to
try to sue motorola, right?  Even if they only have a .6 watt model?  I
realize that some of the higher powered radios, such as the military
motorolas, have warning stickers on them; however, I thought that they
were much more powerful than the highest legal powered cell-phone.
Anyway, what does net.wisdom say about this?
Michael Townsend
michaet@hubcap.clemson
(maybe someone should crosspost this to misc.consumers to *really* start
the flame wars!   Nahhhhh I want educated opinions first. . :-)      )

Xref: sparky sci.electronics:23531 rec.audio:19608 rec.audio.car:5897 rec.audio.pro:2880
From: csmith@plains.NoDak.edu (Carl Smith)
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
Subject: Re: 12V Power Amplifier Design
Date: 27 Jan 93 19:02:13 GMT
Article-I.D.: ns1.C1J0vp.BC0
Organization: North Dakota Higher Education Computing Network

In article <C1It67.5E5@world.std.com> DPierce@world.std.com (Richard D Pierce) writes:
>
>It's now a trivial excercise to design and mass produce car audio
>electronics that have output amplifiers that run of supply rails that are
>much in excess of 12 volts. Try, for example, supply rails of +- 50 volts.
>Before we see how, let's see what this gets us. Assuming a couple of volts
>drop across the output fevices when they're fully conducting (a generous
>assumption but what the hey), that gives you a peak-to-peak output
>capability of +- 48volts, which translates, by your math (which I will
>accept as essentially correct) to an output power 143.9 watts into 8 ohms.
>I would hope that you agree that this is a bit more than the couple of
>what figures you came up with.

And it will deliver 288W into 4 ohm speakers, assuming it can handle
them.

>Poof! like magic, you have a perfectly realizable 150 watt amplifier
>running off a 12 volt car battery. (The downside, of course, is that when
>you realize the the switching converter runs probably 80% efficiency, and
>the am, if biased class AB runs at best about 43%, then we have to have
>about 420 watts running into the beast, which implies an input current at
>13.8 volts of about 30 amps. And there are people who drive vehicles with
>systems having capabilities in the multi-killowatt range, implying many
>hundreds of amps of current draw. Gulp!)

This is where I have trouble accepting the amps that deliver many hundreds
of watts of power.  I have no trouble accepting that it is possible to
pump hundreds of watts into normal 4 and 8 ohm speakers by stepping the
voltage up, I don't see how the car's electrical system can supply the
necessary current for any length of time more than a couple minutes.
I have plans for a stereo 300W/channel amp, and it gets that rating by
stepping up the supply to about 50 volts, and by using 4 ohm speakers.
When tested, it actually clips at about 290 WPC.  Now, assuming that
the amp and supply are 100% efficient, that would take over 48 amps
at 12 volts.  If you consider the 80% and 43% given above, that comes
to 140 amps at 12 volts.  Now you understand why people with these
kinds of amps run power cables directly to the battery, and the cables
are the same size as the battery cables.  Well, batteries can deliver
many hundreds of amps for short periods, but they must be recharged
by the alternator.  And the alternator in my car can put out only 60
amps, and a major portion of that goes to running the cars electrical
system, especialy when the lights are on.   What I am wondering is if
people with these amps have dead batteries all the time...

-- 
------------------------------------------------------------------------
Carl D. Smith                                       Inhale to the chief!
csmith@plains.nodak.edu
From: sl@nessie.mcc.ac.uk (Stuart Lea)
Newsgroups: sci.electronics
Subject: Re: Recording sound on chip
Date: 27 Jan 93 12:05:11 GMT
Organization: Manchester Computing Centre

In article <1993Jan25.214046.9622@hplabsz.hpl.hp.com> sivaram@hplabsz.hpl.hp.com (S. Sivaramakrishnan) writes:
>I am looking for a cheap method to record and playback about 15 seconds of
>sound on a chip.
>
>The whole setup, I GUESS, will comprise:
>1) A microphone
>2) An A/D converter that digitizes the sound
>3) A unit that accepts the commands "record" and "playback"
>4) Some memory that holds the sound image
>5) A D/A converter to generate an analog signal
>6) A speaker for playback
>7) Power supply
>
>Does a chip that has most/all the features except the power supply exist?
>
>If there is an alternative/better method I would be extremely interested to
>know.


The device you are looking for is an ISD1016

This only needs a mic, speaker and a switch to change between rec/play.

It'll record 16 seconds of sound.

Costs about 15 pounds sterling/one off.

It really is a cute chip !!

-- 
+Stuart Lea---Tel:061 200 4809--Fax:061 200 4019---UMIST University-----------+
| JANET   :   sl@uk.ac.mcc.nessie                  B22, Main Bldg., PO Box 88 |
| INTERNET:   sl@nessie.mcc.ac.uk                  Manchester, UK M60 1QD     |
|                 "Weather is here, wish you were beautiful"                  |
From: pbouwe@elaine.ee.und.ac.za (PAUL BOUWER : STAFF)
Newsgroups: sci.electronics
Subject: Spares - General Electric appliance - washing machine
Summary: Help!
Keywords: appliance spares
Date: 28 Jan 93 08:16:48 GMT
Organization: Electronic Eng., Univ. Natal, Durban, South Africa
NNTP-Posting-Host: pc45.ee.und.ac.za

Can anyone help - I am looking for a source of new spares for a General 
Electric top loader washing machine (laundrette type).  Please supply me 
with the email address or fax number of a supplier who would be prepared to 
export a part on payment via Visa Card?  We have no GE agents locally.

Waiting hopefully!

Paul Bouwer

My email address:  pbouwe@elaine.ee.und.ac.za

Thanks
From: atc@waikato.ac.nz
Newsgroups: sci.electronics
Subject: Books on fixing LaserVision disc players
Date: 22 Jan 93 09:22:18 +1300
Organization: University of Waikato, Hamilton, New Zealand

My question is simple:

Are there any good books on fixing Video Laser disc players available?

Thanks in advance.

-- 
Andrew Chambers
Computer Services
University of Waikato
New Zealand

ATC@WAIKATO.AC.NZ
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
From: tapscott@parc.xerox.com (Peter Tapscott)
Subject: Re: 12V Power Amplifier Design
Reply-To: tapscott@parc.xerox.com (Peter Tapscott)
Organization: Xerox PARC
Date: Wed, 27 Jan 1993 00:05:15 GMT


ljkong@napier.uwaterloo.ca (Lennard J. Kong) writes:

>From my experience I think the highest power you can get 
>from 12V without raising the
>voltage is about 33Wrms, which was a Clarion Eq/Amp.

You have to be cautious about accepting wattage ratings
from car amps. The manufacturers frequently exceed the laws of physics
with their ratings.

Using the equation P = V^2/R to estimate power is OK if
the correct V is used. 

I assume that the actual DC voltage is higher than 12, say 14.5
volts, but that the 2.5 volts is needed to boas the output transistors
of the amp, so I will use 12V to be consistant with Lennard.

A sine wave must be produced to measure RMS, so its max peak-to-peak
voltage is 12 volts. Its peak voltage is half that, 6V. The RMS voltage
is (SQRT 2)/2 times that, or about 4.2 VRMS. I will use 4VRMS for
simplicity. Then,

P = 16/R for a 12 volt DC supply. For an 8 ohm speaker, the max
output is only about 2 watts. Figure 4 watts for a 4 ohm speaker.

For Lennard's figure,
33 = 16/R means that the speaker resistance is about 0.5 ohms.
This would be sixteen 8-ohm speakers in parallel - not a likely
installation.

Perhaps the amp is a pair of amps bridged? Then the power quadruples
because the voltage is doubled. A bridged amp can put about 8 watts
into a 8 ohm speaker and 16 watts into a 4 ohm speaker. I would be
suspicious of claims of driving loads much below 4 ohms, except for
very expensive audiophile car amps, like Orion.
-- 
** Peter Tapscott, Xerox - Palo Alto Research Center
** Internet: tapscott.adoc@xerox.com    XNS Net: Tapscott:PARC:Xerox
** 415 813-6885
From: jason@ab20.larc.nasa.gov (Jason Austin)
Newsgroups: sci.electronics
Subject: Re: Car Phones?
Date: 25 Jan 93 14:03:46
Organization: NASA Langley Research Center, Hampton, VA
Reply-To: Jason C. Austin <j.c.austin@larc.nasa.gov>
NNTP-Posting-Host: ab20.larc.nasa.gov
In-reply-to: pjh@mccc.edu's message of Sun, 24 Jan 1993 16:19:26 GMT

In article <C1D9CH.EKJ@mccc.edu> pjh@mccc.edu (P. J. Holsberg) writes:
-> 
-> My, wife, who is a real estate agent, has decided that she needs a
-> telephone that she can use on the road.
-> 
-> How does one go about deciding what type and what brand to buy?
-> 
-> Thanks.

	My dad got himself a Motorola phone and has been very pleased
with it; I couldn't even tell he was on a mobile.  The audio quality
between phones varies quite a bit, so I'd try to get an on the road
demo before buying.
--
Jason C. Austin
j.c.austin@larc.nasa.gov

Newsgroups: sci.electronics
From: austin@eecom.gatech.edu (Mark D. Austin)
Subject: cheap reliable oscillator
Organization: Computer Engineering Group, Georgia Tech, Atlanta, GA 30332-0250
Date: Sat, 23 Jan 1993 01:33:41 GMT


I'm not sure exactly what your looking for, but you might 
try NE566 ~ $1 , which will do triangle and square waves up to 
2Mhz. Another one is 

Intersil 8038 - in 14 pin dip package, sin square, triangle
up to 100Khz. ~$3.00
 
 For a good damped oscillation, try a pendulum! ha ha.

 Good Luck,
 Tim and Mark 
-- 
-----------------------------------------------------------------
		   Georgia Institute of Technology
      School of Electrical Engineering, Atlanta, GA  30332-0250
		    E-MAIL: austin@eecom.gatech.edu
			PHONE: (404) 853-9370
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
From: mxl@cbnewsg.cb.att.com (marc.a.levy)
Subject: Re: 12V Power Amplifier Design
Organization: AT&T
Date: Tue, 26 Jan 1993 12:24:52 GMT

In article <thomasd.33.727991442@tps.COM> thomasd@tps.COM (Thomas W. Day) writes:
>Can anyone give me some advise on power amplifier design for 12VDC power 
>supplies (automotive applications)?  Specifically, what kinds of power 
>supplies are typically used in high power (50W+) designs?  I am hoping to 
>find a practical way to get a high voltage (>+/-25VDC) supply for a bipolar 
>amp.
>

The powersupply is the most complicated, and most expensive
part of the amplifier..  It is no trivial task to design and
build.  I would reccomend you find a DC to DC converter in a
catalog for your applications, and current requirements..
Theese items get verry expencive in higher current models.
For a 100 watt mono amplifier, your would probably need like a
split 24 supply, at 4 amps..  That could run you over $100.

If you are still interested, there was a article in a back
issue of Radio Electronics, on "How to build your own car
stereo amplifier", but if I remember correctly, the
transformer in the powersupply was over $30 (Just for the 1
component), and the total cost of the amp was not much less
that going to the store and buying a similar one.  After you
buy all the parts, and the HUGE chunk of heatsink you will
need for a large power amplifier, it will not be worth it.

Marc.
From: josephc@cco.caltech.edu (Joseph Chiu)
Newsgroups: sci.electronics
Subject: Re: Recording sound on chip
Date: 26 Jan 1993 20:52:36 GMT
Organization: California Institute of Technology, Pasadena
NNTP-Posting-Host: sandman.caltech.edu

sivaram@hplabsz.hpl.hp.com (S. Sivaramakrishnan) writes:

>I am looking for a cheap method to record and playback about 15 seconds of
>sound on a chip.

>The whole setup, I GUESS, will comprise:
>1) A microphone
>2) An A/D converter that digitizes the sound
>3) A unit that accepts the commands "record" and "playback"
>4) Some memory that holds the sound image
>5) A D/A converter to generate an analog signal
>6) A speaker for playback
>7) Power supply

>Does a chip that has most/all the features except the power supply exist?

If this is not a one-time-only project, contact OKI Semiconductors.  They
have "one-chip-solutions" to stored speech.


-- 
Joseph Chiu, Dept. of Computer Science, Caltech.    josephc@coil.caltech.edu
1-57 California Institute of Technology, Pasadena, CA 91126. +1 818 449 5457 
*    Now running OS/2, Windows, DOS, and UNIX (okay, well, maybe not...)   *
Newsgroups: sci.electronics
From: gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan)
Subject: Re: Microwawe detector (microwave oven safety) ?
Summary: Use a Schottky diode and dipole to detect power
Organization: Arizona State University
Date: Fri, 22 Jan 1993 06:30:14 GMT

In article <1993Jan19.095610.5677@cli.di.unipi.it>, luigi@iet.unipi.it writes:
> 
> Is there any device to check whether a microwave oven is safe, i.e. it has
> no microwave spills, the safety switches on the door work, etc. ?
> 

Make thee a dipole antenna, resonating at 2500MHz (??), and instead of
connecting the two wavelength/4 parts of the antenna to coax or to a balun,
install a Schottky diode (Hewlett-Packard HP5082-2835). Measure the
voltage across the diode.

Allen Sullivan



Newsgroups: sci.electronics