HDTenEightyP/NetNews huggingface dataset:
From: jmsulli@eos.ncsu.edu (JASON M SULLIVAN)
Subject: YOU can help with a Senior Project!
Originator: jmsulli@c00803-247dan.eos.ncsu.edu
Keywords: Just a few questions, no givaways needed 
Reply-To: jmsulli@eos.ncsu.edu (JASON M SULLIVAN)
Organization: NCSU Trauma Creation Center
Date: Mon, 14 Sep 1992 16:59:41 GMT



As part of a senior design project we have been assigned to do market research
on a low cost, handheld, digital oscilloscope.  If this research proves
successful, a prototype will be built the following semester.  We would greatly
appreciate your help in defining what features this device should have.
To that end, we would like you to fill out this short form and return it
to us.  Please return answers to jmsulli@eos.ncsu.edu.

Please rank these features in order of importance (1 = most important).
After the rank, pick the option that meets your needs (or include your own).


Rank     Description                 Options
----------------------------------------------------------------------
         Bandwidth                   500kHz, 1MHz, 5MHz 10MHz, 20Mhz

         Channels                    1, 2, 3, 4 

         Input Resolution            50mV, 20mV, 10mV, 1mV

         Number of Samples           100, 500, 1000, 5000

         External Trigger Input            

         Built-In Signal Generator   Programmable, Sine/Square/Triangle

         Size/Weight                 0.5 lb, 1 lb, 2 lb, 3 lb

         Ruggedness                  Office, Lab, Outdoors

         Battery Duration            1hr, 2hrs, 3hrs, 4hrs

         Backlit Display

         PC Interfacing              Data Transfer, Control, Both

         Multimeter                  Volts, Amps, Ohms, Farads, Henrys

         Frequency Analysis          Fundamental Period, Full Spectrum


What other features would you like to see in this product?

What would be the biggest drawback in a product of this type (ie. what
shortcoming would you find most annoying)

What would you use this type of product for?

Any additional comments?


Again Thanks in Advance for your Advice, and send the replies to the address
given below.  

--
Jason M. Sullivan             /=))   +---------------------------------------+
jmsulli@eos.ncsu.edu         |c-oo   | "There's a rainbow inside your mind!" |
                            //\_-  --+---------------------------------------+
Xref: sparky sci.electronics:15485 comp.sys.intel:1681
From: drosera@hal.gnu.ai.mit.edu (Donald Burden)
Newsgroups: sci.electronics,comp.sys.intel
Subject: Re: Info needed on 16MByte SIMMs for PC
Date: 11 Sep 92 02:41:31 GMT
Article-I.D.: mintaka.1992Sep11.024131.5679
Organization: /etc/organization

In article <BuDJsw.8t1@unx.sas.com> sasbge@ant.unx.sas.com writes:
>
>2.  I have turned and read *every* page in this months issue of 
>_Computer Shopper_.  I only saw one advertisement for 16MByte SIMMs.  Is
>this beast so very new to the PC world that they are not yet available?
>I'm trying to determine if it would be possible to purchase the 16MB

From what I've read TI (Texas Instruments) is the only source for 16 megabit
DRAMs.  They are currently only making them for military uses now, with 
commercial production starting this winter.  I wouldn't expect 16 MB SIMMS
to be released, and commercially viable (costing less than four times the
price of 4 MB SIMMS) before next summer at least.  Out now though are 
8 MB SIMMS, but these just contain twice as many chips as 4 MB SIMMS.
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Inquiry: What is the best way to permanently label Panels ?
Summary: Avery transparent laser printer labels
Date: 12 Sep 92 21:51:42 GMT
Distribution: usa
Organization: University of Georgia, Athens

Avery transparent laser printer labels.  You can get these in various
sizes and in uncut 8.5x11-inch sheets.  They are translucent, rather
like Scotch "Magic" tape.  Laser-print on them, and it's remarkably
durable.  I used one of them to put my name and address on the outside
of my laptop computer.  In three years of hard use it doesn't show any
wear at all.

-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
Newsgroups: sci.electronics
From: pandey+@cs.cmu.edu (Manish Pandey)
Subject: Need help to build an Audio Amplifier
Organization: School of Computer Science, Carnegie Mellon
Date: Sat, 12 Sep 1992 02:38:23 GMT


 I am interested in constructing an audio amplifier and I need some
help from fellow-netters who may have some experience building one.

 My specifications include the following:

     1. Output power: Moderate : anywhere from 35W to 100W.
     2. Low distortion:   0.01% (Typical)
     3. Simplicity of construction. 
        I am considering using a separate amplifier for each audio 
        driver. ( So that there are no high level crossover networks)
     
     Also I have power supplies which give me +-27 Volts at 10Amps.

 Among the options I am exploring are the following

     1. Using LM12, the power OP AMP manufactured by National Semiconductor.
        It can deliver upto 150 W of power ( of course limited by pwr supplies)

        Advantage: Excellent performance, extremely simple
        Disadvantages: It seems a little bit pricey at $35 for each 
                       chip and I will probably need 6-8 of these.


     2. Using TDA1514 manufactured by signetics. 
        Powerout Max = 40W into 8ohms.


        Advantage: Excellent performance (low noise, distortion 0.01% typ)
                   Cheap $4.50/chip + a few more support components.

        Disadvantage: The only distributor I know of ( Marshall Industries )
                   sells a minimum of 45. I could stockup to maybe 10-15 
                   of these but 45 seems a lot of waste. 

  So, my questions are the following:

      Q1 Has anyone used LM12 / TDA1514 to build audio amps ?
         what has been their experience ?

      Q2 Do people have any suggestions as to other commercially
         available chips which match the ones mentioned in Q1?

      Q3 Are there any Signetics distributors which sell in small
         quantities?

      Q4 Is anybody interested in group purchase of the TDA 1514 ?

      
Thanks a lot for your help. I will post a summary of the responses
I get.


Manish Pandey

Newsgroups: sci.electronics
From: arm@helix.nih.gov (Andrew Mitz)
Subject: Re: Searching for real-time OS's for 386/486 PC
Followup-To: sci.electronics
Organization: National Institutes of Health, Bethesda
Distribution: sci
Date: Fri, 11 Sep 1992 01:01:55 GMT

In article <MONTY.92Sep10130500@blackhole.lerc.nasa.gov> monty@blackhole.lerc.nasa.gov (Monty Andro) writes:
>
>Hello,
>
>Currently, I'm familiar with VRTX the real time OS from Ready Systems.
>I would like to know about other real-time OS's people are using for
>their embedded applications using a 386/486 PC.  If possible, could
>you include a phone number of the company.  Will post a summary of
>responses if there is sufficient interest.
>
>Thanks,
>Monty

I think there is a real time news group. Check your server list.  If you
can't find it, send me an Email.



-------------------------------------------------
Andrew Mitz          |    NIH Animal Center
Biomedical Engineer  |    Poolesville, MD
-------------------------------------------------

All opinions expressed are my own.
From: prob@btmp24.be (Pascal Roobrouck SH53)
Newsgroups: sci.electronics
Subject: Re : 68HC705KICS Worth of try ?
Date: 8 Sep 92 10:36:21 GMT
Reply-To: prob@btmp24.be (Pascal Roobrouck SH53)
Organization: Alcatel Bell Telephone, Antwerpen, Belgium


In article <HEKE.92Aug25115735@stekt.oulu.fi> heke@stekt.oulu.fi (Heikki
Paananen) writes:
>Now I am just wondering are these K-series MCUs useful. From the ad 
>I got the idea that the K1 MCU holds only 0.5K EPROM and 32b of RAM. 
>In what kind of projects it is applicable for? I would like to hear
>of applications you out there have done with that creature.

I don't use the 68HC05 but I do work with the ST62T15. It has a little
more memory: 1820 bytes EPROM/OTPROM and 64 bytes of RAM. However
because it's so cheap ( 7 $) you can replace lots of 'special functions'
IC's with it. Some of the applications I did :
 * MCU-controlled switch mode power supply. With the internal A/D sample
the voltage & current and through a piece of 'soft' directly control a
power MOS. This supply can charge Lead-Acid batteries, NiCads , displays
V, I, P and can have all sorts of protection ...) I agree the accuracy
is only 8 bit, but for me thats just fine.

 * an ANEMOMETER (WindSpeed) Through the use of four IR-gates the
rotation of a propellor is monitored and speed and wind-direction are
calculated. Results are transmitted serially on the same wire that
powers the 'remote' unit. 

 * A digital motor-speed controller for RC-equipment. Can drive with PWM
two motors directly, mixes the Forward/Reverse & Left/Right signals to
the drive for left and right motor. Low Battery indication, etc.

 * A Alarm system for cars. (I don't tell you the features since I want
to keep my car)

I think that you can conclude that with very small microcontrollers, you
can build very usefull applications. Just don't try to handle large
texts on a display, 64 bit Floating Point,  FFT, etc...

Succes

Pascal 
       
   ~~..~~
     `'
From: neal@cmptrc.lonestar.org (Neal Howard)
Newsgroups: sci.electronics
Subject: Re: Lo-voltage florescent bulbs?
Date: 14 Sep 92 21:30:40 GMT
Organization: CompuTrac Inc., Richardson TX

In article <BuJIMH.8Kn@news.cso.uiuc.edu> pdg@math.uiuc.edu (Paul Grayson) writes:
>
>  I've seen lots of flashlights with what looked like florescent bulbs in them.  The flashlights ran at <10Volts.  Does anyone know where I could get the bulbs??

I've seen small fluorescent bulb replacement units for solar-charged sidewalk
lamps in hardware stores such as True Value and Home Depot stores. Each lamp
housing has a solar cell mounted on top which charges a small ni-cad battery
pack inside. The higher voltage needed to power the tiny fluorescent bulb
is provided by an equally small power inverter module inside the lamp housing.
Replacement bulbs and other parts were on the shelf next to the whole lamps.

=======================================================================
= Neal Howard                         | '91 Harley Sportster XLH-1200 =
= email: neal@cmptrc.lonestar.org     | DoD # 686                     =
= CompuTrac, Inc. (Richardson, TX)    | '69 Cougar XR7-GT390          =
=======================================================================
Newsgroups: sci.electronics
From: djenkins@wang.com (Dave Jenkins)
Subject: Re: Where does snow come from?
Organization: Wang Labs, Lowell MA, USA
Date: Tue, 08 Sep 92 13:54:08 GMT

smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:


>The big radio telescopes operate their circuitry close to 0degrees, because
>they want to see the background noise from the universe.
I thought some small percentage (1%-5% ?) of the snow on your TV was
attributable to the background noise.
From: tidedu@lims01.lerc.nasa.gov (WILLIAM DEDULA)
Newsgroups: sci.electronics
Subject: Inquiry: What is the best way to permanently label Panels ?
Date: 12 Sep 92 19:41:00 GMT
Distribution: usa
Organization: NASA Lewis Research Center
News-Software: VAX/VMS VNEWS 1.41


Hello All;
I am preparing to build a project which I want to turn out really neat. I'd
like to know if anyone has any ideas about what is the BEST and NEATEST way
to permanently label a control panel, or a chassis. I would require 
alphanumeric characters as well as straight lines. Anyone have any system 
which works great for them, or any ideas ??? Thanks !!!

Tim
From: Aki_Mimoto@panam.wimsey.bc.ca (Aki Mimoto)
Newsgroups: sci.electronics
Subject: z80
Date: 12 Sep 92 15:29:39 GMT
Organization: Commodore Computer Club / PaNorAmA

alot of thanks to the people who answered my my question, since I can't
respond personnaly(cheaf fool hasn't paid his dues) some thanks goes out to
(chrono order) Juerg Stettbacher,Tim Coslet (quite alot,yes I
can),Jeff(I'll try to keep in touch),Ralf Bundschuh, Gorden Rogers (I'll
tryto keep in touch)
Andrew Dyer(wombats?)

-- Via DLG Pro v0.992
Newsgroups: sci.electronics,rec.video
From: andy@cmptrc.lonestar.org (Andy Hart)
Subject: Re: Macrovision
Date: Sat, 12 Sep 1992 22:43:58 GMT
Organization: CompuTrac Inc., Richardson TX

In article <1992Sep12.020805.13569@panix.com> schuster@panix.com (Michael Schuster) writes:
>
>I've posted about this before but perhaps this would be a good time to
>bring it up again. The pros on CompuServe's CE Forum said during a
>discussion of Macrovision that with the schematic you can modify any
>VCR to ignore Macrovision. You do this by clipping the capacitor which
>forms the time constant for the AGC circuit, effectively disabling the
>AGC. Yes, you won't get automatic level control, but the video signals
>fed to most comsumer VCR's are so compressed anyway that there wouldn't
>be much danger.
>
>-- 
>_______________________________Mike Schuster________________________________
>NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
>The Portal (R) System: schuster@cup.portal.com   | MCI Mail,GEnie: MSCHUSTER

  That's very interesting.  I wish I knew enough about electronics to feel
  confident of identifying the correct capacitor... if so I would try this
  out on an old deck.

  I've had a couple of these so-called "macrovision buster" devices.  It's
  been my experience that they don't work worth a hoot.  They usually make
  it worse.  Among other things they always seem to cause extreme shearing
  at the top of the picture.

  Does anyone know of a really good macrovision buster, or is such a thing
  possible?



-- 
+--------------------------------------------------------------------+
|   Andrew Hart                   |  CompuTrac, Inc.                 |
|   (214) 235-7161 x 5320         |  222 Municipal Drive             |
|   andy@cmptrc.lonestar.org      |  Richardson, TX  75080           |
+--------------------------------------------------------------------+
From: johna@psdcae1.gvg.tek.com (John Abt)
Newsgroups: sci.electronics
Subject: Re: 3rd Party PADS Manuals?
Keywords: PADS schematics
Date: 7 Sep 92 18:44:07 GMT
Organization: Grass Valley Group, Grass Valley, CA

In article <1992Sep4.120131.5672@pt.com> kng@pt.com (Ken Gravenstede) writes:
>Are there any 3rd party manuals for PADS?  
>The manual that comes with the 
>shareware version is just too little.  I realize that if I buy the full version
>I'll get the full set but what they supply is not really enough to do a small
>board.

Has anyone done a small board?? Is the above true?
I have the shareware but I haven't done anything with it yet.

John Abt
Newsgroups: sci.electronics
From: Brian R. O'Hern (BRO'HERN)
Subject: Impedance match 50 to 75 ohms
Followup-To: same
Reply-To: ohernb@lonexb.rl.af.mil
Organization: USAF Rome Laboratory
Distribution: na
Date: Thu, 10 Sep 92 17:58:50 GMT
Expires: soon

Short of buying a pad, does anyone know a good (cheap) way of matching a
cable tv coax (75ohms) to the input of a HP spectrum analyzer (50 ohms)?
I'm interested in the 500MHz to 1GHz range.


Thanks
BRO'HERN (Electronics Engineer)
____________________________________________________________________________
           STD DISCLAIM APPLIES ('disClaim dat I make is no lie...)
Unless otherwise noted, I say what I say about what I think or thought with
total disregard for what the U. S. Air Force says or thinks and vice versa.

____________________________________________________________________________
From: ron@horizon.com (Ron McDaniels)
Newsgroups: sci.electronics
Subject: ELECTRONIC TECHNICIAN position available in San Diego
Keywords: Job offered, San Diego
Date: 10 Sep 92 21:52:56 GMT
Distribution: ca
Organization: Science Horizons, Inc.


Science Horizons, an innovative company in the data acquisition 
business, is seeking candidates for a job as an ELECTRONIC TECHNICIAN. 

The Hardware engineering department at Science Horizons designs and 
builds microprocessor-based digital system elements.

The ideal candidate will have at least four years experience and the
following qualifications:

	o Experience in building wire-wrap and point-to-point prototype
	  electronic circuits from schematics.

	o Experience in rework of surface mount and through-hole PCBs.

	o Ability to assist with trouble shooting electronic circuits.

	o Intimate familiarity with the tools and test equipment (PCB
	  rework tools, oscilloscopes, signal generators, logic
	  analyzers, protocol analyzers, etc.) necessary to perform the
	  aforementioned tasks in an extremely competent manner.

	o Familiarity with SCSI bus and serial data communications.

	o Some experience with UNIX workstations.

	o Able to start a new job IMMEDIATELY.

It wouldn't hurt if you were to LOVE electronics and computers to the
extent that you would rather build electronic toys than eat, but that
is not absolutely necessary:-)

If you think that you are the BEST qualified person for this job,
please send your resume to:

		Ron McDaniels
		Science Horizons,
		710 Encinitas Blvd.,
		suite 200,
		Encinitas CA 92024

		e-mail: ron@horizon.horizon.com
		FAX (619) 942-1652.

Please DO NOT telephone Science Horizons with respect to this
advertisement. If you provide us with a resume, you will receive
a telephone call.
--

            = Ronald L. McDaniels = Science Horizons, Inc. =
            = 710 Encinitas Blvd. = Encinitas, CA 92024    =
            = +1 619 942-7333     = Fax: +1 619 942 1652   =
From: markey@flash.ATC.Olivetti.Com (Tim Markey)
Newsgroups: sci.electronics
Subject: Tiny LCD
Date: 10 Sep 92 17:16:22 GMT


     I recently tore apart a lcd watch which I would like to modify so
     that I can control the lcd with a microcontroller.  Inside is a very
     small pcb with a central processor, a crystal, a capacitor, etc all
     surface mount.  Is there any way I can use this board to drive the LCD
     but still have control over it.

     Alternatively, does anyone know of a lcd driver which I could use to
     drive this lcd, the voltages seem to be quite small (less than one volt).
     Or maybe there are off the shell combination lcd/drivers which are
     small enough for my use.     

     Any suggestions are appreciated, thanks.

     TJM
From: ps@tangtown.hanse.de (Peter Schwarz)
Newsgroups: sci.electronics
Subject: WANTED: Info about available neuro chips
Distribution: world
Date: Fri, 04 Sep 92 20:09:16 GMT
Organization: CeCa

Hello,
I am looking for all available chips that
are built to simulate neural nets.

I would like to get IC names and manufacturers.

--

+-------------------------------------------------------+
|   Peter Schwarz        | Tel.: 49-4109-6420           |
|   ps@tangtown.hanse.de | Adr.: Claudiusstr. 22        |
|                        |       D-2000 Tangstedt       |
+------------------------+------------------------------+
From: HARVEY@SLACVM.SLAC.STANFORD.EDU
Newsgroups: sci.electronics
Subject: D/A on parallel port
Date: 11 Sep 92 00:12:50 GMT
Organization: Stanford Linear Accelerator Center

I am looking for the circuit to output sounds through the parallel port.
The schematics in the MODPLAY package are difficult to understand. Does
anyone out there have a better schematic for this circuit. Any help
will be gratly appreciated. My computer understands Orcad, Pads , Gifs as
well as Postscript.

Harold
From: st_waldman@zodiac.dsto.oz.au
Newsgroups: sci.electronics
Subject: Frequency-domain curve fitter wanted
Date: 7 Sep 92 21:45:12 GMT
Organization: D.S.T.O. Aeronautical Research Laboratory

Hi,

I am interested in curve-fitting sound pressure and impedance
response functions in the frequency domain using a rational
fraction polynomial formulation. Does anyone have any source
code to such a routine in Fortran, Pascal, or C?.

I have seen a paper titled "A Frequency Domain Curve Fitting
Algorithm With Improved Accuracy", by Jim Adcock (Hewlett-
Packard) and Ron Potter (Consultant) that was presented at a
modal analysis convention a few years ago.

The above algorithm can fit to data that is log-spaced in the
frequency domain, which is the common form for audio/acoustic
measurements as published in loudspeaker manufacturers data
sheets.

My application is related to modelling of loudspeaker systems so
that it will be possible to design crossover networks that take
into account each driver's natural response characteristics.

Any suggestions or pointers where I could obtain program source
code that implements this algorithm will be gratefully received.

Maybe even someone from Hewlett-Packard can help me?

Thank you.

-----------------------------------------------------------------------
 Witold Waldman
 Aeronautical Research Laboratory   Internet: witold@hotblk.dsto.gov.au
 Melbourne                          Fax     : +61 3 646 7771
 Australia                          Tel     : +61 3 647 7488
-----------------------------------------------------------------------
Newsgroups: sci.electronics
From: totty@flute.cs.uiuc.edu (Brian Totty)
Subject: ??? Low Temperature Thermostats For Beer Lagering ???
Organization: Picasso Group, DCS, University of Illinois, Urbana-Champaign
Date: Fri, 11 Sep 1992 19:37:10 GMT

	Does anyone know of a thermostat that can be attached to a power cord
	that allows accurate temperature control down to the freezing point?
	Several of us want one for accurarate refrigeration control at low
	to moderate temperatures (say 32F to 70F), to attach to standard
	refigerator power cords.

	There is a thermostat called an 'Air-Stat' which has an LCD display
	and plugs into power cords that allows accurate temp control down to
	40F.  It was originally intended for window air-conditioners, and
	sells for approximately $25.

	We would like to get one that operates closer to freezing (for
	accurate long-term lagering of beer).  Does anyone know of a
	thermostat in the same ballpark price range that will do this for
	us?

						Thanks For Any Help,


						--- Bri


   /                       Brian Totty             o o
  /__  __  o     Department of Computer Science     o  
 /  / /   /          1304 W. Springfield Ave       \_/  "We have corn in
/__/ /   /               Urbana, IL 61801                Massachusetts too!"
                        totty@cs.uiuc.edu
From: sanders@ll.mit.edu ( Jeff Sanders)
Newsgroups: sci.electronics
Subject: Transformer questions...
Date: 15 Sep 92 16:12:03 GMT
Distribution: sci.electronics
Organization: MIT Lincoln Laboratory
Originator: sanders@ll.mit.edu ( Jeff Sanders)


	I am attempting to build a power inverter from a magazine article and
would like to use one of several transformers from my spare parts collection.

I have the following questions:

	1) How careful must this selection be made, i.e. is it possible to use
most transformers with the proper turns ration as long as the current rating
is within my limits?

	2) Most of my scrap transformers have at least 8 wires coming out
(some have more) - what are they all for?

	3) Are transformers intended to be used one way only (step-up or
step-down) or can I reverse them.  For example, can I use a 120 VAC primary/
12.6 V CT secondary with the power inverter?

	4) What exactly does the VA rating indicate?

	I know these seem like elementary questions, but this is the first
time I'm dabbling with transformers.  Any help will be greatly appreciated.

	Regards,  

		Jeff