HDTenEightyP/NetNews huggingface dataset:
From: someone@Texaco.com (Larry D. Pyeatt)
Subject: Re: Human Voice Digitising By Using A/D & D/A
Organization: Texaco
Distribution: usa
Date: Mon, 14 Dec 1992 21:55:38 GMT

In article <1gg7rlINNcs1@charnel.ecst.csuchico.edu>, helho@ecst.csuchico.edu (Weird!!) writes:
|> Hi,
|>    I am trying to build a project which is able to digitise human
|>    voice by using a microphone input and a small speaker output.
|>    Since the band width of human voice is no more than 10KHz ( i guess)
|>    ,therefore I need a antialiasing filter to cut off those unused   
|>    frequency ( is that right?) What kind of filter is good enough to
|>    deal with this job? Then the filtered analog voice signal will be 
|>    digitized by a A/D converter with a sample-hold built-in. My choice
|>    is National semiconductor DA8020, is it a good choice? 
|>    Then The 8 bits digital signal will go to a D/A converter( DC8010 )
|>    Is it a good choice? The analog output will connect with a smoothing
|>    filter to "smooth" the signal. Finally the message will be played
|>    back by a 8ohm/4ohm speaker.
|>    Now, my questions are :
|>      (1) Are those A/D & D/A  good enough for voice analysis?
|>      (2) Which antialiasing and smoothing filter is suitable?
|>      (3) How to interface the microphone with the circuit?
|>      (4) How to connect the speaker with D/A converter?
|>      (5) sampling rate = input clock signal ?
|> 	 

Those chips should be adequate for your needs.  You probably only
need a bandwidth of 5KHz or so.  You should build a 5KHz low pass filter
on the input, and then sample at 10KHz.  In fact, you could probably
do a 4KHz low pass filter and sample at 8KHz without losing much
information.  Just remember to filter at 0.5 of your sample rate.

You probably will not neet to smooth the output very much.  The 
coil in the speaker will take care of most of it.  You may want to
add a capacitor across the speaker.

-- 
Larry D. Pyeatt                 The views expressed here are not
Internet : pyeatt@texaco.com    those of my employer or of anyone
Voice    : (713) 975-4056       that I know of with the possible
                                exception of myself.
Xref: sparky sci.electronics:20999 sci.energy:6206 rec.autos.tech:16823
From: pngai@adobe.com (Phil Ngai)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 17:33:22 GMT
Organization: Adobe Systems Incorporated

In article <1992Dec16.192456.6261@news.cs.brandeis.edu> andyh@chaos.cs.brandeis.edu (Andrew J. Huang) writes:
>2. There are several places for the energy to go during an explosion.
>Since the energy is kinetic, a lot of it will end up as particle
>velocity.  Some will dissipate into the air as air friction (some hot
>air as a side effect).  A quantity of energy will go into the
>mechanical breaking of the flywheel disk itself.  Some more will go
>into the penetration of the flywheel housing.  What residual energy
>escapes these will have to be determined by testing.

I could describe the explosion of a few sticks of dynamite
in just about the same way.

Question for the science impaired: how does the energy in a
stick of dynamite compare with a gallon of gasoline?

>3. You don't need to destroy cars to test the safety/danger of
>exploding flywheels.  You just take a flywheel, spin it to 10 times
>its rated capacity, and give it both barrels of a 10ga shotgun loaded

Am I supposed to believe these things will have a 900% safety margin.

>The potential for these IS tremendous.  As I remember, the power
>output of a flywheel is roughly "equivalent to a V8" in a much smaller
>volume and weight.  Couple this with a super efficient small engine
>running full time at maximum efficiency, minimum pollution to keep the
>flywheel "charged" and you can get power, economy, cleanliness and range.

I'm starting to think you are speaking of a system where the flywheel
is just a small battery for a vehicle with an on-board IC engine and a
fuel tank.  Most people who talk about flywheel systems intend for the
flywheel to store ALL the energy. No gasoline, etc.

-- 
My opinions are my own.
From: toddi@mav.com (Todd Inch)
Subject: Re: XMAS Lights Theft Alarm
Organization: Maverick International Inc.
Date: Thu, 17 Dec 92 21:12:26 GMT

In article <1992Dec10.182447.16893@vpnet.chi.il.us> cgordon@vpnet.chi.il.us (gordon hlavenka) writes:
>>>... The device would work by detecting the AC current being
>>>consumed by the lights, then triggering an alarm if it drops below a certain
>>>point.
> toddi@mav.com (Todd Inch) writes:
>>This will be very nearly impossible with parallel-wired (C-7 or C-9) bulbs, and
>>still difficult with series-wired mini lights.  Here's why:
>
>But you don't need to look at a steady-state current, just a sudden
>change.  This should be pretty simple to spot.

Hmm, didn't think of that.  But what if the bulb is disconnected when the
AC is at/near 0 Volts?  I suppose that if the bulb is mechanically disconnected,
the disconnection would generate some noise that might last long enough for
the voltage/current to rise again (e.g. essentially switch bounce)?

And of course, twinkle-lights just wouldn't do :-).
Newsgroups: sci.electronics
Subject: FTP address for mirror of INTEL BBS (was INTEL 8052 w/BASIC ...)
From: news@massey.ac.nz (USENET News System)
Date: Fri, 18 Dec 92 01:41:02 GMT
Organization: School of Maths. and Info. Sci., Massey University, Palmerston North, NZ

In article <1992Dec17.074158.24271@informatik.uni-wuerzburg.de> rzuw039@winx03.informatik.uni-wuerzburg.dbp.de (Juergen Weinelt) writes:
>From article <1992Dec15.175451.19971@hou.amoco.com>, by zklf0b@gs144.hou.amoco.com (Fergason):
>> In article <533@bit.UUCP> thomas@bit.UUCP (Thomas Walter) writes:
>>>
>>>Did INTEL place the BASIC rom code for the 8052 (8031, etc.) in
>>>PUBLIC DOMAIN?
>> 
>> according to the recent Computer Craft, it is, and the src is
>> available on an Intel BBS.
>
>If it's really PD, could somebody please upload the code (source
>and executable, if possible) to some FTP site? Accessing an INTEL
>BBS from outside the US can be quite expensive...
>

The following info, saved a while ago, should help those that want
some FREE 8051 software ...


-- Date: 7 Oct 92 03:46:09 GMT
-- Organization: Manchester Computing Centre
-- Keywords: 8051 software
-- Summary: Is there an FTP mirror of the Signetics '800' number BBS ?
-- Lines: 15
-- 
-- There is a subset of the Signetics BBS available by FTP
-- from lyman.pppl.gov,  as previously mentioned in this group.
-- However it is (and probably will remain) only a part of the
-- software available to owners of Modems in the USA who have
-- access to the Signetics machine.  As a non modem owning
-- European,  I would like to ask if someone would mount a
-- complete mirror of the Signetics 8051 archive.  It would seem
-- to be in the interest of the chip producers and chip programmers
-- (in the educational sector or otherwise) to do so.
-- 
-- Can you hear me,  Signetics/Philips ?.
-- 
--                 Cheers
--                                 Ian H.

There's all sorts of goodies on there, including a version of TINY
BASIC that will run on the barefoot 8051 (with 128 bytes of ram).
As I remember the 8052 BASIC was there also.

Have fun ...

Cheers
Giovanni


-- 
-----------------------------------------------------------------------------
Giovanni Moretti                                                       ZL2BOI
Computer Science Department, Massey University, Palmerston North, New Zealand
G.Moretti@massey.ac.nz      Phone +64-6-356-9099            Fax 64-6-350-5611
From: fzteller@betty.ucdavis.edu
Newsgroups: sci.electronics
Subject: DSP info
Date: 14 Dec 92 05:07:54 GMT
Organization: Computing Services, UC Davis
Originator: fzteller@betty.ucdavis.edu


Does anyone know of a site on the net where I can get info on the following 
fields?
  
  Digital Signal Processing
  The operation of the "Digital Out" jack on some CD players
  Digital Filters
  Basic Digital audio data
Newsgroups: sci.electronics
From: tgzhang@MtHolyoke.edu (Tian Ge Zhang)
Subject: ftp site for Macrocell in Magic
Organization: Mount Holyoke College
X-Newsreader: Tin 1.1 PL5
Date: Mon, 14 Dec 1992 17:17:05 GMT




Hello, I am an undergr. student at Mount Holyoke College. I am working on
the Magic cad tool for my independent project which is to design a digital
circuit for playing Tit tak toe game, the circuit layout I came up with
uses about 72 gates. 

I wonder if anybody knows any ftp sites that provide scmos cells ready to
use, especially the Macrocells functions such as 8-3 line Encoders, 4- 16
line decoders.  My intension is to speed up the design by using the made
cells instead of drawing them myself by connecting basic gates(NAND, NOR),
that way it can save much time. Anyone have a clue about this? Thanks to
aue company which provides basic functions, but I would be happier if
there are well-made macrocells.  Thanks in advance.

--Tian  tgzhang@mhc.bitnet

Newsgroups: sci.electronics,alt.guitar
From: rg@futserv.austin.ibm.com (R.G. Keen)
Subject: Re: Tube amp transformers
Date: Fri, 11 Dec 1992 19:09:14 GMT
Reply-To: ...@cs.utexas.edu:ibmaus!auschs!tmn1.austin.ibm.com!tung
Organization: IBM Coporation - Advanced Workstations Division.

I'll second the "distortion generated before the transformer" 
thought. In my experience, the changes are all made by
overdriving preamp or power output tubes. An amplifier design
that overdrives the output transformer will probably destroy
output tubes after only a few hours of operation due to the 
unlimited current in the tube in the magnetic saturation region
of core operation. The transformer is all that limits the B+
current in the output tubes. or at least the primary limiter.

R.G.
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: 486DX2 Crystals
Date: 14 Dec 92 06:19:47 GMT
X-Maildoor: WaflineMail 1.00r


  Sir Van Der Wal spoke forth saying:
"Re: 486DX2 Crystals" toward
 on 12-11-92  22:35
 KVDW> This makes sense to me. Though I still wonder where my DX2 get's its
 KVDW> 66MHz clock from if the crystal runs at 33MHz only. Does it contain
 KVDW> some internal clock doubler circuitry?


    That's why they call it the Dx2! :)

    Stephen - Cyberman@toz.buffalo.ny.us/Cyberman@exucom.com


... This is a tagline, this is ONLY a tagline.
---
 * Blue Wave/QWK v2.11 *
                                              
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: andyh@chaos.cs.brandeis.edu (Andrew J. Huang)
Subject: Re: Flywheel batteries as EV power source
Organization: Brandeis University
Date: Thu, 17 Dec 1992 19:39:06 GMT

In article <1992Dec17.011649.987@cmkrnl.com> jeh@cmkrnl.com writes:
>In article <1992Dec16.192456.6261@news.cs.brandeis.edu>,
> andyh@chaos.cs.brandeis.edu (Andrew J. Huang) writes:
>> <I have to admit an emotional response to this since I think that
>> flywheels have tremendous potential.>
>
>The flywheel is a great way to store mechanical energy.  However I'm not
>certain about the means for using it.  Somehow the energy must be gotten 
>outside of the container.  Mechanical couplings are probably out -- too much

I would opt for direct utilization of the mechanical energy coming out
of the flywheel.  If you've got a magnetic coupling, consider it a
clutch and run it to your transmission.  Forget the lossy mechanical
to electric, electric to mechanical conversions.

I don't consider flywheels to be batteries for electric cars.  They
are a high output energy reservoir that can be filled from an onboard
low power high efficiency IC engine.  That way we have the best of
both worlds - a fuel tank of explosives and disk of intense kinetic
energy.

-andy

Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: Looking for MC3363
Organization: SSC, Inc.,  Seattle, WA
Distribution: usa
Date: Wed, 16 Dec 1992 05:19:12 GMT
X-Newsreader: TIN [version 1.1 PL6]

jhwhit01@ulkyvx.louisville.edu wrote:
: Try Arrow Electronics (1-800-93-ARROW or 1-800-932-7769).  
:  
: p.s.: In case you missed it, all the chips I listed were being looked for this
: past week by posters to the sci.electronics newsgroup.

What sort of luck have "just normal people" had with distributors
that take credit cards and have semi-reasonable minimums like
Arrow, Allied and Newark?

Mark Zenier  markz@ssc.wa.com  

Newsgroups: sci.electronics,sci.physics
From: btbg1194@uxa.cso.uiuc.edu (Bradley T Banko)
Subject: Failure modes of p-n junction devices running high current?
Organization: University of Illinois at Urbana
Date: Sun, 20 Dec 1992 00:21:29 GMT

I am curious to know how p-n junction devices in high (?, 1 amp) forward
current mode over time.  We have an 11 year old infrared laser diode
which has just melted down.  How do p-n junctions age and fail?

Thanks.  Please respond by email.

Brad Banko
b-banko@uiuc.edu


-- 
Brad Banko;  Dept of Physics;  U of Illinois;  b-banko@uiuc.edu
=========================================================================
Tatiana Gutsu for President!                     73 de kb8cne @ n9lnq.il
Newsgroups: sci.electronics,comp.robotics
From: paul@grafted.UUCP (james caldwell)
Subject: Re: Infrared remote controls
Organization: GRAFTED, Central Indiana's Usenet BBS 317-881-4369
Date: Fri, 11 Dec 92 21:38:56 CST

jmce+@andrew.cmu.edu (James Ryan Miller) writes:

> 
>     I am trying to find information on how infrared tv remote controls
> send signals.  I have one of those infrared receivers from Radio Shack
> hooked up to my 68HC11EVBU board, and have been experimenting with
> trying to program it to read the buttons off a remote control for a Sony
> Trinitron tv.
> 
Call sony they will be more than glad to help. Also their training
manuals have the info in them, some of their service manuals have the
info. Sony has a remote decoder chip which will decode the info for 
interpretation by a microprocessor. Please send me
 1) the model number of the unit (tv or vcr) that the remote goes too.
 2) the number on the remote you are using. 
 I can get look this info up for you. 
Oh the code is a complex signal which has...
1) Device the signal is intended for
2) Key you are pressing
Also the remote just send out a "repeat key" if you hold down the button.
                                Paul
                                
I don't know if email or a reply will work. So you can call me at 
                1- 317-926-5337(work) and ask for Paul caldwell or
                leave a message where I can call.

--
james caldwell
The Grafted Branch BBS
317-881-4369
internet: paul@grafted.UUCP
uucp: ..!uunet!grafted.UUCP!paul
 = = Grafted Branch BBS (317) 889-6997 2 Gig on-line = =
Xref: sparky sci.electronics:21178 sci.energy:6272 rec.autos.tech:16933
From: Ted_Eugene_Viens@cup.portal.com
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: Sat, 19 Dec 92 01:25:33 PST
Organization: The Portal System (TM)
  <1992Dec16.192456.6261@news.cs.brandeis.edu>
  <1992Dec17.011649.987@cmkrnl.com> <1992Dec18.012654.26238@ra.oc.com>
  <77851@ncratl.AtlantaGA.NCR.COM>

>In <1992Dec18.012654.26238@ra.oc.com> rodder@ccwf.cc.utexas.edu (Jon D. Rodder
)
> writes:
>
>|Well, lets see..  the 20hp permanent magnet motor in our solar powered car
>|is about 6 inches in diameter and 6 inches long.  It weighs under 20lbs.
>|See the GM Impact for a production style example of a compact high power
>|motor.
>
>Yes, but what is your 0-50 mph time.
>
>--
>Mob rule doesn't become any prettier, just because the mob start to call itsel
f
>a government.
>It ain't charity if you are using someone else's money.
>Mark.Wilson@AtlantaGA.NCR.com
>
   I knew it would come to this...
Lets see if we can find some perspective to place this in...
   As electric vehicles near production, the effeciency, size, and power-weight
 
ratio will lead to designing vehicles with motors at the wheels.  Either two
motors or four motors on each vehicle.
   Now let us look at a minimal electric vehicle with current technology.  
Probably a sub-compact with a strong light-weight chassis, a lot of light-weigh
t 
materials, batteries, and two electric motors on the rear wheels.  This would 
give it 40 Horsepower.
   How does this compare with current vehicles?  Hmmm..  I have a beat-up 1975
Mercedez 240D.  This is a compact car and fairly heavy.  The diesel engine is
a 2400 cc power monster with a whopping rated 65 horsepower.  Now, I use every
engine elixir I can waste my money on, so I am probably getting most of my
65 horses.  I am seldom left at the light by anyone (more of a tribute to my
wild diesel driving style.)  Most of us have been annoyed by diesels creeping
through the light ahead of us.  But these are often cars over 15 years old that
probably have barely over 40 horses left in their engines.
   Now lets compare this to our minimal EV.  We will have a car with Two thirds
the weight of my car powered by two thirds the horses.  This wouldn't change my
driving style...  I am looking forward to being one of the first people in the
world to get a deal on an early model Flywheel powered Electric Used car (Its
my style.)
   It all seems possible to me...  Ted..
From: limrcd@hpsgm2.sgp.hp.com (Richard LIM)
Newsgroups: sci.electronics
Subject: Ni-Cd storage state question.
Date: 15 Dec 92 10:49:07 GMT
Organization: HP Singapore Notes-Server

I curious to know how should one store used Ni-Cd rechargeable 
batteries. Should they be stored CHARGED or fully DISCHARGED?
And Why?

I use quite a few Ni-Cds but they usually die if I stop using 
them on a regular basis.

Therefore, I seek the wisdom of those who know?

.ps How does that apply to the newer Cam-corder batteries?

Regards
Richard Lim     "A conclusion is where you get tired of thinking"
======================================================================
E-mail:  hpsgm2.SGP.HP.COM!limrcd   Snail-mail: Hewlett-Packard S'pore
Tel:     (065)-279-2525                         (APD-ThinFilm SS/EE)
Telnet:        520-2525                         1150 Depot Road
HPDesk:  Richard Lim/HP3200/30                  Singapore 0410.
Newsgroups: sci.electronics
From: baden@sys6626.bison.mb.ca (baden de bari)
Newsgroups: sci.electronics
Subject: [* NINTENDO PG PINNOUT... *]
Date: Sat, 19 Dec 92 16:07:31 CST
Organization: System 6626 BBS, Winnipeg Manitoba Canada

 
        I was wondering if someone would have any additional information 
about the nintendo power glove pinnouts, etc.
 
                Thanks.
        >>Baden<<

Xref: sparky sci.electronics:20959 sci.energy:6190 rec.autos.tech:16803
From: pierson@ggone.enet.dec.com (Dave Pierson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 16:26:17 GMT
Organization: Digital Equipment Corporation

In article <1992Dec17.011649.987@cmkrnl.com>, jeh@cmkrnl.com writes, in part:

>The flywheel is a great way to store mechanical energy.  However I'm not
>certain about the means for using it.  Somehow the energy must be gotten 
>outside of the container.

	Indeed.  Modern technologies of inverters and induction motors will
	make it a LOT easier.  The RR suppliers (more in Europe than in the US)
	routinely build KW, "four quadrant" (bidirectional) inverters up to
	500 KW or so, with good enough efficiency to replace relays in control
	gear.  The difference is they have a locomotive to move them
	around on.

>Then we come to electric motors to drive the wheels.  Electric motors have
>wonderful torque/speed characteristics for vehicles (they generate maximum
>torque just before stall speed, which may make transmissions and clutches
>unnecessary) but lousy power density -- look at the size of a 1-hp. electric
>motor sometime and tell me how big a motor would have to be to accelerate a
>car fast enough to keep up with gasoline-powered ones.  
	urmmmmm.  Compare, sometime, the size of a 500HP traction motor
	(found in sets of four or six) UNDER a locomotive.  Not that
	dissimilar to a 500 hp gasoline engine.  And Electric motors have
	short term overload characteristics to deliver, briefly, large amounts
	of power above the steady state (Large:  ~10X for minutes, ~double for
	~hour.)  If the batteries are ready, the motors will be.  And modern
	control systems will allow use of the overload capacity without
	impacting the long term reliability of the motor.  "consumer size"
	electric motors (say up to 1 hp) are on a very different part of the
	HP/Volume/Weight space than those for _serious_ power.

I believe the key to (autonomous) electric vehicles is still the storage.  I
have not got numbers here, but best batteries are still (roughly) 10x weight
and/or volume over gasoline in weight/energy.  Flywheels are better, but not,
i think, more than 2x better.

thanks
dave pierson			|the facts, as accurately as i can manage,
Digital Equipment Corporation	|the opinions, my own.
40 Old Bolton Rd		|I am the NRA.
Stow, Mass 01775 USA		pierson@msd26.enet.dec.com
"He has read everything, and, to his credit, written nothing."  A J Raffles
From: d89-ahg@ludd.luth.se (Anders Hedberg)
Newsgroups: sci.electronics
Subject: Microchip EBBS programs ftp: able ???
Summary: Wanna ftp programs from the EBBS.
Date: 14 Dec 92 22:10:22 GMT
Organization: Lule} Tekniska H|gskolas Datorf|rening - Ludd

Is there some ftp:able site that has the programs from Microchips
Electronic Bulletin Board System ?

I'm looking for new versions of the PICSIM simulator and related source
code examples.

If not could someone please send them to me ? ( I could talk to our local
FTP guy for a nice PIC directory if someone is interested... )

/Anders Hedberg
Newsgroups: sci.electronics
From: dcovell@hfglobe.intel.com (David Covell)
Subject: Re: Tube Audio Amp Kits/Info Wanted
Organization: Intel Corporation
Date: Fri, 11 Dec 1992 16:34:09 GMT

denny@hpscit.sc.hp.com (Trueman Denny) writes:

>There is a Publication called "Glass Audio" that has many articles on how to

>build Tube Amps and Preamps.  I dont have the address or phone handy.  Please

>email me to remind me to bring the info to work.  I will email the info to

>you.  Subscriptions are $20.00 for 4 Issues.


Subscription inquiries: (603) 924-9464
Newsgroups: sci.electronics
From: mtarrant@ATK.COM (Mike Tarrant)
Subject: Re: "dumb" pagers
Organization: Alliant TechSystems Inc.
Date: Thu, 17 Dec 1992 18:16:37 GMT

In article <1gnnjfINN3sd@hp-col.col.hp.com> dag@col.hp.com (David Geiser) writes:
>On second thought, a 'library' type security system might be 
>just what you need.
>
>Each box gets its own unique strip -- no active parts, no
>batteries, just a computer to keep track of the box and its strip
>signature.  Ping the whole pallet and listen for the unique
>signature of the wanted box.  Build some df into the listener and
>you could ping a whole quadrant or shelf area of the warehouse.
>So over all you need the strips, a database manager for the
>signatures, and a smart listener that will say yes/no for one
>particular signature.
>
>
>dag

  If you're going to go to all the trouble to check each box
individually, you might as well just use bar codes.  
         - Mike (mtarrant@atk.com)

Newsgroups: sci.electronics
From: lenny@hobbs.hunt.inmet.com (Lenny Goodman)
Subject: Telephone Headsets
Organization: Intermetrics, Inc.
Date: Fri, 18 Dec 1992 23:03:48 GMT

I've been looking into telephone headsets (the things that telephone
operators usually wear) and the prices are much higher than I expected:
$160 - $200 and UP.  Basically, the thing consists of half a headphone,
a microphone, and a small amplifier.  I would have thought that the price
would be $60 to $80.  Does anyone know why they are so expensive; or,
does anyone know a source where the price is more reasonable??  Thanks.

  -- Len
Newsgroups: sci.electronics