HDTenEightyP/NetNews huggingface dataset:
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: Parallel and Serial P
Date: 11 Apr 92 20:08:05 GMT
X-Maildoor: WaflineMail 1.00r

MS>I've noticed on the specs of the Trantor parallel port-to-SCSI adaptor that
MS>writes (i.e. output from the parallel port) are twice as fast as reads
MS>("input" via the parallel port). Does this mean the "input" is kludged?

It means they use 8bits for the output and 4bits for input the PC
parallel port has a LIMITED number of inputs but considerably
more outputs.  Here is what I'm talking about:
--------------------------------------------------------------------------------
Programing the IBM PC Parallel Port
Ports for LPT1
~ indicates active low output
0x378 DATA          0x37A Input         0x37A Output
BIT                 BIT                 BIT
[7] D7              [7] Busy            [7] unused
[6] D6              [6] ~Acknowledge    [6] unused
[5] D5              [5] Paper Out       [5] unused
[4] D4              [4] Select          [4] IRQ 7 En
[3] D3              [3] ~Error          [3] select
[2] D2              [2] unused          [2] ~PRIME
[1] D1              [1] unused          [1] ~AutoFeed
[0] D0              [0] unused          [0] ~Strobe
pinouts for DB25 parallel Port
[O](01) ~Strobe                        [O](14) Auto Feed
[O](02) D0                             [I](15) ~Error
[O](03) D1                             [O](16) ~Prime
[O](04) D2                             [O](17) Select to printer
[O](05) D3                             [G](18) Ground
[O](06) D4                             [G](19) Ground
[O](07) D5                             [G](20) Ground
[O](08) D6                             [G](21) Ground
[O](09) D7                             [G](22) Ground
[I](10) ~acknowledge                   [G](23) Ground
[I](11) Busy                           [G](24) Ground
[I](12) Paper out                      [G](25) Ground
[I](13) Select from printer
--------------------------------------------------------------------------------
notice their are 13 ouput bits and only 5 input
1 input bit is used for IRQ7 the other 4 remaining bits are for
data input.
8 bits are available for output and another bit [other than
strobe] is used to flag a transfer.

        STEPHEN CYBERMAN@TOZ.BUFFALO.NY.US
        commiserated at Sat  04-11-1992  11:47:24
---
 * SLMR 2.1a * When you spit in the wind it comes right back at you.
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: low-cost SPEECH RECOGNITION : Does U know where to look?
Date: 13 Apr 92 22:02:31 GMT
Organization: The Inquiring Mind  1 204 488-1607

I'm looking for a a low-cost recognition S/W & H/W (or PC)
I want to be able to use it for MENU SELECTION for HANDICAP , therefore
the recognition only needs to be limited to the items on the menu, so
it doesn't need to be overly sophisticated.
pls EMAIL response.

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Xref: sparky sci.electronics:8502 rec.music.cd:4005 rec.audio:7410
From: rbp@investor.pgh.pa.us (Bob Peirce #305)
Newsgroups: sci.electronics,rec.music.cd,rec.audio
Subject: Re: requesting CD player advice
Date: 14 Apr 92 15:41:23 GMT
Reply-To: rbp@investor.pgh.pa.us (Bob Peirce #305)
Organization: Cookson, Peirce & Co., Pittsburgh, PA

In article <1992Apr11.171059.4664@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>In article <ku9ldkINNh0l@exodus.Eng.Sun.COM> nemeth@helix.Eng.Sun.COM (Les Nemeth) writes:

>>A CD player can have .0001% distortion, but if it has a tinny sound who the
>>heck is gonna buy it. Probably the guy that doesn't take the time out to 
>>compare one player to the other...  Conversely, if another player has .001%
>>distortion but has a muddy sound, who the hecks gonna want it either. What
>>we are looking for is the one that sounds the most natural, regardless of
>>the distortion level, provided it's not around 10%.
>
>My dictionary defines distortion as a deviation from the orginal signal
>waveform. It doesn't define "muddy" in any useful way. When you get the
>same signal out of a recording that was put into it originally, that's
>no distortion. A machine with .03% total distortion is over 200 times
>more faithful to the orginal recording than a system with 7% distortion.
>Whatever "muddy" means, it has to show up in the total distortion figure,
>or you are describing the orginal signal, and there's no helping that.

You are both right.  Does anybody see why?  Distortion measurements are
specific tests that objectively measure specific forms of distortion. 
They don't measure all possible types of distortion, defined as
deviations from the original sound.  The ear can hear deviatoins from
the original sound.  If somebody could identify what those deviations
look like in the waveform of the sound THEN you could measure them and
identify them objectively.  Until then, there is no solution except a
combination of specifications for a gross evaluation and listening for
final selection. 
-- 
Bob Peirce, Pittsburgh, PA         rbp@investor.pgh.pa.us         412-471-5320
venetia@investor.pgh.pa.us [NeXT Mail]  !uunet.uu.net!pitt!investor!rbp [UUCP]
From: achen@uhuru.uchicago.edu (Andrew Chen)
Newsgroups: sci.electronics
Subject: IC info?
Date: 5 Apr 92 19:02:46 GMT
Distribution: usa
Organization: University of Chicago

Recently there were a few posts on Comp.sys.intel discussing specs
of Intel's 486 chips (line width, transistor count, die size).  
Just from curiousity, does anyone have these numbers for other
kinds of chips, such as 7400/LS/HC, 4000-type CMOS, etc.?

 

-- 

Andrew Chen -- achen@uhuru.uchicago.edu
Newsgroups: sci.electronics
Subject: Re: TTL level control of 120VAC power
From: hbg6@phx.mcd.mot.com (John Schuch)
Date: 14 Apr 92 13:37:26 GMT
Organization: Motorola Computer Group, Tempe, Az.

In article <1992Apr13.015117.6037@uhura.neoucom.edu> wtm@uhura.neoucom.edu (Bill Mayhew) writes:
>The way to go is to use an optically isolated solid state relay.
>New, these things go for about $15-$20.  Ratings vary, but are
>.......

The May issue of Radio Electronics has an article on how solid state
relays work, how to build them, and how to select the proper parts.

John

------------------------------------------------------------------------
John Schuch           hbg6@citek.mcdphx.mot.com            (602)438-3008
------------------------------------------------------------------------
      One wonders if there would be such a pursuit of artificial
      intelligence if there were more of the natural kind around.
------------------------------------------------------------------------
From: bc338569@longs.LANCE.ColoState.Edu (Brian J. Catlin)
Newsgroups: sci.electronics
Subject: How much protection do I need?
Date: 13 Apr 92 03:11:25 GMT
Organization: Colorado State University  -  College of Electrical Engineering

I am planning on building a digital tachometer for my truck.  For the input,
I would like to count the number of times that the ignition coil is pulsed.  
Since there are likely to be some rather large power spikes, I would like to 
know what kind of circuitry I would need to protect my TTL-level circuitry.

Any suggestions would be greatly appreciated.

B. J. Catlin
------------------------------------------------------------------------------
-----  Brian J. Catlin                     *  Colorado State University  -----
-----  bc338569@longs.LANCE.ColoState.Edu  *  Electrical Engineering     -----
-----  (303) 491-2841                      *  Fort Collins, Colorado     -----
------------------------------------------------------------------------------
From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Re: Help needed: Resistor S.O.T.
Date: 9 Apr 92 08:55:37 GMT
Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson)
Organization: Dept Electrical and Electronic Eng, Manchester University, UK

In article <1992Apr7.144316.4559@cfmu.eurocontrol.be> christophe@cfmu.eurocontrol.be (Christophe Paquay) writes:
[ascii deleted (nice though it was)]

>    The above described scheme is extracted from a TV PAL encoder which
>  I try to realize. Unfortunately, I'm facing a problem with the resistor,
>  because I don't hnow its value. The only reference I have is "S.O.T.".
>  If somebody is able to help me by giving any information about this
>  resistor, please send me a message.
>                    I'm awaiting anxiously your information.
>                        
>                               Many thanks in advance, C. PAQUAY



SOT stands for Select On Test. Not very helpful I know, but the idea is
to start from some reasonable first approximation and jiggle the value until
the circuit works as desired. Its cheaper than a pot!

Without more detail I can't really suggest a good starting value, but
I assume its a burst gate generator so the idea is to set the RC time 
constant to something like the duration of the colour burst pulse and
then adjust it to cope with differencs in gate thresholds etc.

Mark
mark-r@snow_white.ee.man.ac.uk
From: jeff@sparc38.cs.tamu.edu (Jeff Goldberg)
Newsgroups: sci.electronics
Subject: changing 220 line to 110
Date: 8 Apr 92 02:48:58 GMT
Reply-To: Jeff@cs.tamu.edu
Organization: Department of Computer Science, Texas A&M University

I need to change a 220v line to 110v line in my house.  Do I just need
to switch the line from a 220 source at the breaker box to a 110 source
and then change the wall socket/face plate to allow a normal grounded
plug to be used?  It seems that this is all that would be necessary,
however I guess the wires would be a bit heavy for 110, but would that
make too much difference?  The line is used to power a 10k btu window
a.c.

The old a.c. was 220V, 60Hz, 13.2/14.4 amps, and 17Kbtus.  The new one
is rated at 115V, 60Hz, 10.3/12.6 amps, and 10Kbtus.

Thanks lots for any help... (from a Computer Scientist not a DoubleE),
--

         Jeff Goldberg                         	       	      
         College Station, Texas                              
From: smay@hpdmd48.boi.hp.com (Scott Smay)
Date: Wed, 8 Apr 1992 00:20:44 GMT
Subject: Loudspeaker equivalent circuit?
Organization: Hewlett Packard - Boise, ID
Newsgroups: sci.electronics

Can any of you audio folks provide an equivalent circuit for a "typical"
stereo speaker, or failing that, describe a speaker's impedance over the
20-20KHz band?

Thanks in advance, (email or post at your convenience)
scott smay
From: gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan)
Newsgroups: sci.electronics
Subject: Re: Slew Rate & distortion was (Re: requesting CD player advice)
Summary: Slewrate limiting IGNORES fine detals of input
Date: 17 Apr 92 07:06:11 GMT
Organization: Arizona State University

In  <43720@as0c.sei.cmu.edu>, rsd@sei.cmu.edu (Richard D'Ippolito) writes:
> In article <se0biINNaaa@network.ucsd.edu> Matt Kennel writes:
.....LOTS DELETED...... 
> acceleration error, meaning that the output will follow the input with a constant position error (lag). 

In slew rate limited behavior, there is some point in the circuit that is
MOVING AS FAST AS IT CAN. Often that point is a capacitor being charged
up or down by a current source.

When a circuit is moving as fast as it can, asking for more is fruitless.
And if you are already overdriving it, to cause the slewing, then the
fine details of your input (including error signals in a feedback loop)
will be ignored. 

Allen Sullivan			Go-Video    Scottsdale AZ
Newsgroups: sci.electronics
From: sherwood@cbnewse.cb.att.com (charles.a.sherwood)
Subject: Schematic Editors
Organization: AT&T
Distribution: usa
Date: Tue, 7 Apr 1992 17:09:46 GMT
Keywords: supersketch and supercad


Hi Net:

I am looking for a good schematic editor and pcb layout package.

So far, I have demos disks for Supercad by Mental Automation and
Supersketch by Labcenter/R4 systems.

I think supersketch is the better of the two, does anyone
have any others I should consider or any comments on these
two?

I found these by looking in the latest issue of Radio Electronics.

If you want demo packages you can call:

Superschetch	416-439-9302	
or download it from their BBS 416-289-4554

Supercad	206-641-2141
Newsgroups: sci.electronics
From: pschauer@den.mmc.com (Paul Schauer 1-1090)
Subject: Signetic's SLICE PAL software
Originator: pschauer@evans
Organization: Martin Marietta Astronautics, Denver
Distribution: na
Date: Wed, 8 Apr 1992 20:02:32 GMT
From: dac@dacami.UUCP (David Culberson)
Newsgroups: sci.electronics
Subject: Color monitor problems; got a magnet near it by accident.
Distribution: world
Date: 10 Apr 92 16:54:07 EST
Organization: My home system.

  I accidently got a large magnet near the front of my monitor, a
Mitsubishi Diamondscan.  I didn't think the magnet in my smallish speakers
were very large, but they are.  Now bottom right corner of my monitor has
a little blurring and some discoloration.  Nothing SERIOUS, but I am
pissed as hell at myself, and I'd like to know how to get it fixed.  Can I
do it myself?  If not, what is a good price to get it done by someone
else, and what should I ask for?  Thanks alot!

  Reply via E-mail, and I will summarize, if you wish.

		-David

--
( dac@dacami.UUCP - cis.ohio-state.edu!n8emr!bluemoon!dacami!dac ) Amiga//
( - David Culberson v1.0; 1.2 due out any time now. - )               \X/
From: apollo@buengc.bu.edu (Doug A. Chan)
Newsgroups: sci.electronics
Subject: Making a phone line busy / off-hook ?
Date: 10 Apr 92 16:30:06 GMT
Distribution: usa
Organization: College of Engineering, Boston University, Boston, MA, USA
Originator: apollo@buengc.bu.edu

What value resistor & wattage should I use to cause a phone line to
go into the off-hook condition?

I remember someone asking this many weeks ago but I neglected to jot
down the info...

E-mail the info and I'll post a quick summary if there are many requests...

apollo@buengc.bu.edu
Xref: sparky sci.electronics:8257 comp.dsp:1093 sci.engr.biomed:206 sci.math:5831
From: berrier@sweetpea.jsc.nasa.gov (K. Berrier 283-4125)
Newsgroups: sci.electronics,comp.dsp,sci.engr.biomed,sci.math
Subject: Re: quaternians, tracking, 3 dimensions
Date: 9 Apr 1992 17:40:48 GMT
Organization: nasa-jsc

A quaternion is a transformation matrix consisting of a scalar 
and a vector.  The scalar is the angle of rotation about the 
axis represented by the vector.

They are often used to represent the relationship between two 
coordinate systems since there are only four elements instead 
of the usual nine. (Decreasing the number of calculations 
required and increasing speed of computation.)

I cannot direct you to a particular source but it would probably 
be worth your while to learn about them.

			...keith
-- 

=======================================================================
Keith Berrier                             berrier@sweetpea.jsc.nasa.gov
McDonnell Douglas Space Systems Co.

              " these opinions are my own, not my employer's "
Newsgroups: sci.electronics
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Subject: Re: Mercury Memory
Organization: Northeastern Ohio Universities College of Medicine
Distribution: usa
Date: Thu, 16 Apr 1992 12:00:06 GMT

I've also seen some old time books that described memory elements
that stored 1/0 on electrodes by forming nonconductive gas bubbles,
then breaking the bubbles with an applied pulse.  I beleive the
idea of operation is similar to a so-called coherer dectector that
was used in the early days of wireless.  In the latter, a direct
current forms the bubble and the impinging radio signal breaks the
bubble.  When the bubble breaks, a click is heard in headphones
attached across the device.

Re: delay lines.  I worked taking care of the DP equpment in a bank
proof and transit department in the late 1970s.  They were still
using CA 1962 IBM 1260 check inscribing mahcines.  The machines
were all solid state, using IBM familar square silver "SLT"
integrated circuit modules.  ...that is, save the memory.  The
memory was a big clock spring (looks essentially the same as the
sping in my wall clock) sealed in an aluminum box.   There were
transducers at each end of the spring and amplifiers and squarers
to reshape and time the pulses.  Occasionally one of the workers
would trip and bump into a machine and dump the totals, very much
annoying the worker running the mahcine.  The spring memory would
hold about 4K of data.  The system to format the memory on power-up
was pretty interesting.

Before that I bought an early 1960s Olivetti Programma 101 desk
calculator.  It was about the first all electronic solid state
programmable calculators around.  It had about 400 discrete
transistors.  The memory was a few K (forget exactly how much now)
glass rod acoustic delay line.  There was off line memory that used
tabulator cards that had a magnetic strip.  I couldn't find the tab
cards, so I made my own out of mylar with 1/2 inch mag tape glued
on for the stripe; it more or less worked.

-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu   (140.220.1.1)
Newsgroups: sci.electronics
From: tjk5@po.CWRU.Edu (Timothy J. Kordas)
Subject: Re: Intel i860's, 33 Mhz, $200 obro
Organization: Case Western Reserve University, Cleveland, OH (USA)
Date: Tue, 14 Apr 1992 17:24:00 GMT

In article <1992Apr13.145116.1750@nic.csu.net> cornhead@sutro.SFSU.EDU (Jeffrey C. Miller) writes:

>I have some 33 Mhz i860's for sale. Asking $200, will probably take 
>the best offers over $100. 

>E-mail me as cornhead@sutro.sfsu.edu if you're interested.

>-cornhead

These are just the chips right?

Newsgroups: sci.electronics
From: whit@milton.u.washington.edu (John Whitmore)
Subject: Re: The thickness of a human hair ...
Organization: University of Washington, Seattle
Distribution: usa
Date: Mon, 6 Apr 1992 21:01:35 GMT

In article <6177@public.BTR.COM> thad@public.BTR.COM (Thaddeus P. Floryan) writ\
es:

>Back to the serious topic of measurements used in semiconductor manufacture:
>is it not true that dimensions (or positioning accuracy) are often (always?)
>expressed in terms of microns and/or Angstroms?

        Actually, the depths of diffusions are measured in microns
or Angstroms (or nanometers), while the lateral dimensions are commonly
in mils (thousandths of an inch).  This is for historical reasons;
the literature that covered diffusion was scientific and used SI
units, while the literature that covered lithography was from
the printing industry, which measured in mils and inches.

        Those lateral dimensions of interest only to the chip
designer (via widths, spacing rules) are small enough to
be inconvenient in mils, and are given (usually) in microns
where the numbers are of order unity.  The die size and pad
dimensions (which would be of interest to a customer building
hybrids from the chips) are still specified in mils, however,
in the data sheets I've seen.

        John Whitmore

                                                                           


Xref: sparky sci.electronics:8291 comp.dsp:1099 sci.engr.biomed:215 sci.math:5882
From: olli@tk18.oulu.fi (Olli Silven)
Newsgroups: sci.electronics,comp.dsp,sci.engr.biomed,sci.math
Subject: Re: quaternians, tracking, 3 dimensions
Date: 10 Apr 92 10:25:46 GMT
	<1992Apr9.174048.11924@aio.jsc.nasa.gov>
Reply-To: olli@ee.oulu.fi
Organization: University of Oulu, Dept. of EE, Finland
In-reply-to: berrier@sweetpea.jsc.nasa.gov's message of 9 Apr 92 17:40:48 GMT

K. Berrier 283-4125 writes:

   A quaternion is a transformation matrix consisting of a scalar 
   and a vector.  The scalar is the angle of rotation about the 
   axis represented by the vector.
   .
   .
   I cannot direct you to a particular source but it would probably 
   be worth your while to learn about them.

A good source: Roberson, R., Schwertassek, Dynamics of Multibody
               systems, Springer-Verlag, Berlin, 1988.
--
     Olli Silven
     olli@ee.oulu.fi
From: pgf@cayman.COM (Paul Fox)
Newsgroups: sci.electronics
Subject: Re: Pinewood derby finish (was help. . .)
Date: 9 Apr 92 18:36:29 GMT
Organization: Cayman Systems Inc., Cambridge Ma

Gee -- I hope the Brownies get this much high-tech attention too!  (I'll bet
	they don't, but this isn't the right newsgroup...)
paul fox, pgf@cayman.com

	...
: >>For 2 lanes photo diodes and a dual trace scope would be a quick and
: >>dirty solution.  I just switched lanes and ran the heat over which
	...
: >>
: >>One pack near us used a camcorder that does slow motion and freeze
: >>frames.
	...
: >The pack that I'm cubmaster of, has built our own track from scratch.  Its
: >an eight lane marvel.  It has an electronic finish line, that works on the
	...
: I programmed my commodore 64 to time up to 7 lanes down to 1/1000th of a
: second and enter the times into a spread sheet looking thing.  I run the
	...

-- 
		paul fox, pgf@cayman.com, (617)494-1999
		Cayman Systems, 26 Landsdowne St., Cambridge, MA 02139
Newsgroups: sci.electronics
From: larrie@beaufort.sfu.ca (Larrie Simon Carr)
Subject: Re: Electrostatic Field Promotes Hair Growth ???
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Fri, 10 Apr 1992 06:56:26 GMT

In article <1992Apr8.161344.1284@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>In article <1992Apr8.070856.10703@ux1.cso.uiuc.edu> stever@mrcnext.cso.uiuc.edu (Steve E. Robinette) writes:
>>Has anyone heard of this??? It seems a company in Canada has designed a device that looks like a beauty salon hair dryer. The hood has four pairs of
>>positively and negatively charged electrodes, which are powered by a 12-volt
>>battery. While the patient sits under the hood for twelve minutes, his/her
>>head is surrounded by an electrostatic field of positive and negative charges
>>which stimulate hair growth. No one knows eactly why the treatment works, but when a patient takes the treatment once a week for a period of one to two years, hair comes back. This is a treatment not a cure. It must be continued for life
>>
>>Can anyone "shed" any light on how this might work. Seems as though you
>>could build you own quite easily instead of the $4500 a month they'll be 
>>charging to use it. Be interested to hear some ideas...
>>
>
>I very very much doubt that it works.  At $4500 a month, it sounds like a
>scheme for separating fools from their money.
>
>Ever heard of SCIENTIFIC MEDICINE, folks?
>

There is currently research being done at the University of British
Columbia about the ability of ELECTRIC CURRENT in stimulating hair
growth.

They say it works.  Mind you, I wonder the long term effects.

-- 
Larrie Carr                 
Engineering Science               (604) 291-4451  
Simon Fraser University           (604) 298-1050
British Columbia, Canada          larrie@sfu.ca
From: harkcom@spinach.pa.yokogawa.co.jp (Alton Harkcom)
Newsgroups: sci.electronics
Subject: rs232 breakout box
Date: 17 Apr 92 03:46:51 GMT
Organization: Yokogawa Electric Corporation, Tokyo, Japan


  I want to make a 'box' with LEDs monitoring the 1-8 and 20 pins
and breakers/jumpers/switches to be able to adjust the layout of
the connections between two devices connected to the 'box'.  The
breakers/jumpers/switches part doesn't seem so hard to do, but I want
the LED's to operate off the connected devices power...  However, I
don't want the LED's to distort the signals.  One idea was to have 
all of the LED's accross FG and RTS with PNP transitors to control
the LED's by using the desired signal at the base.

ex. TD
	      RTS
	       |
	    resistor
	       |
	     diode
	       |
	       |
	     |--
	TD --|
	     |<-
	       |
	      FG

   Will this be fairly reliable?  Am I confused on the PNP transistor?
Is the idea a flop due to some aspect of electronics or rs232 that I
don't know/understand?

   Also, would someone point me towards some designs for rs232 breakout
boxes?   Any other related comments that you might think I would find
helpful or just interesting?

Al
From: maj@hpfcso.FC.HP.COM (Mike Jassowski)
Date: Wed, 8 Apr 1992 14:37:08 GMT
Subject: Re: Jacob's Ladder
Organization: Hewlett-Packard, Fort Collins, CO, USA