HDTenEightyP/NetNews huggingface dataset:
From: gary@ke4zv.uucp (Gary Coffman)
Subject: Re: Flywheel batteries as EV power source
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Destructive Testing Systems
Date: Mon, 11 Jan 1993 16:31:52 GMT

In article <1993Jan11.041045.13640@cis.ohio-state.edu> rubin@skiing.cis.ohio-state.edu (Daniel Rubin) writes:
>
>You are totally wrong!  Black powder is NOT a primary explosive.  It will
>NOT "detonate" if burned in the open.  It will not "detonate" if it is placed
>in a conceal container such as a bullet casing and ignited.  All BP does is
>deflagrate and produce a large quantity of gasses.  Do you understand the
>difference between detonation and deflagration?  The only way to possiblly
>get black powder to detonate is with a very powderfull detonation to start
>the process.  It is extremly difficult and blasting caps will not do it.  You
>may be thinking of nitrocellulose or "gun powder" it can be made to detonate,
>but again that is extremely difficult.  A substance is said to detonate if
>the rate of probagation of the burning front through the substance is faster
>the the speed of sound.  A substance is said to deflagrate when it burn
>slower than the speed of sound and does not produce a large shock wave which
>is the result of detonation.

Consult the Hazmat database, or the DOT classification schedule. Black
powder is most definitely classed as an explosive while nitrocellulose
propellant powder is classed as a flamable solid. You can ship smokeless
gunpowder UPS, but black powder must be transported by special hazardous
materials carriers licensed to transport explosives. There is only one
black powder plant in the US. It is completely remotely operated because
of the extreme explosion hazard offered by black powder. That's the Hogdon
Powder Works. In the 19th century, black powder mills were notorious for
exploding from static electricity or other trivial ignition sources. There 
were only two mining explosives, blasting powder (aka black powder) and
nitroglycerin in the 19th century. Both were considered extremely dangerous
to handle. Nobel made his fortune by inventing a safer explosive, dynamite.

Just why do you think the barrels of modern black powder rifles are two to 
three times as thick walled as those of modern high power smokeless propellant 
rifles? It isn't because of a difference in metallurgy.

Gary
-- 
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | uunet!rsiatl!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | emory!kd4nc!ke4zv!gary      
Lawrenceville, GA 30244     |                     | emory!ke4zv!gary@gatech.edu
From: sajja@gradient.cis.upenn.edu (Rajeev  Sajja)
Newsgroups: sci.electronics
Subject: Digital --> NTSC commercial Boards: Info needed
Date: 7 Jan 93 15:01:27 GMT
Distribution: usa
Organization: University of Pennsylvania

hi. 
I would like to know if there are commercial boards that convert
digital (binary form) data to NTSC compatible signals for any
of the workstation platoforms (IBM RS/6000, SUN, DEC etc..) out there

IF you know of any please emamil me.

thanks

-Rajeev
From: scottcr@wkuvx1.bitnet
Newsgroups: sci.electronics
Subject: 9600 baud Modem design?
Date: 10 Jan 93 18:34:08 GMT
Organization: Western Kentucky University, Bowling Green, KY

I am designing a custom 9600 baud link using a voice channel
with the following specs: BW: 100-5Khz  S/N = 35+ dB.

Are there any "rules of thumb" about choice of carrier
freq 2K ?  3k ?  What about FSK deviation?  With this
type of system how does modulation index affect performance?

High speed data communications is new to me; audio & RF is my
thing.  This link would not have any error correction other than
"parity".  "Shannon's law" shows this to be practical; but I am
at a loss for what would be optimum.

? 
-- 
Chris Scott,  C/E Public Radio,  Western KY Univ,  (502) 745-3834
SCOTTCR@WKUVX1.BITNET      fx off: 745-2084     fx hm: 781-1232  
Newsgroups: sci.electronics
From: tbc@cbnewsk.cb.att.com (thomas.b.cook)
Subject: nicads for Gameboy?
Organization: AT&T Bell Labs, Princeton, NJ
Distribution: usa
Date: Tue, 5 Jan 1993 04:25:34 GMT


The manual for Gameboy says not to use nicad batteries. I 
called their hot line where I was told that this is because
the nicads can explode and damage the game. What are the
conditions where this is a concern? I have some ideas but
I'd appreciate the net.wisdom interpretation of this warning.

TIA,
Tom
Newsgroups: sci.electronics
From: ulan@ee.ualberta.ca (Dale Ulan)
Subject: Re: 9600 baud Modem design?
Organization: University Of Alberta, Edmonton Canada
Date: Wed, 13 Jan 1993 03:06:59 GMT


You may want to check out Yamaha... they make some 9600 baud modem chips.
They may have better (or worse) pricing.... but they do have them. 
I don't remember part numbers.... nor distributors....

---
Dale Ulan   VE6DAU     ulan@ee.ualberta.ca   Comp Eng Undergrad

Newsgroups: sci.electronics
From: kevin@clsi.COM (Kevin Cameron)
Subject: Re: "1-bit DAC"
Originator: kevin@dubhe
Reply-To: kevin@clsi.com
Organization: CAD Language Systems Inc.
Date: Fri, 8 Jan 93 02:17:50 GMT


In article <1ii574INNdgp@shelley.u.washington.edu>, whit@carson.u.washington.edu (John Whitmore) writes:
> In article <C0F8Hp.84n@ve7frg.ampr.org> doug@ve7frg.ampr.org (Doug Collinge - VE7GNU) writes:
> >If my CD with a "1 bit DAC" and the aid of "8 times oversampling"
> >can produce audio as good as an older CD with no "oversampling" and
> >a 16-bit DAC then can my circuit with an 8-bit DAC be replaced
> >with a 1-bit DAC and 4-times oversampling?
> 
> 	Welcome to marketing buzzword confusion hour.
> 
> 	A "1-bit DAC" is a sigma-delta D/A converter, and if
> you want to use it for CD output, it has to be 16-bit capable.
> Because, the input to it will be a 16-bit number, more than likely.
> 
> 	There are no CD players that have 'no oversampling';
> perhaps an early multi-kilobuck unit or two with no oversampling
> were produced, but I've never seen one.

Sony did dual 16bit DAC units a few years ago.

> 	An eight-bit DAC is rarely linear to 16-bit precision,
> and will not successfully reproduce CD sound.

But a 8bit DAC linear to 16bits is cheaper to produce than a 16bit DAC (linear
to 16bits) - less silicon.

Kev.
-- 
Kevin Cameron         CLSI,Suite 100,5457 Twin Knolls Rd.,Columbia MD 21045,USA
kevin@clsi.com        Tel: (USA) (410) 992 5700 (- 5709) X224
uunet!clsi.com!kevin  Fax:       (410) 992 3536
------------------------------------------------------------ Reality Is virtual
Newsgroups: sci.electronics
From: cmwolf@mtu.edu (christopher m. wolf)
Subject: Instant Replay Machines
Organization: Michigan Technological University
Date: Wed, 6 Jan 1993 19:06:00 GMT

Could someone explain instant replay machines.  Do they keep
recording while playing back?
Newsgroups: sci.electronics
Newsgroups: sci.electronics

For RF:
	- stick the chips upside down on a ground plane and solder
	 components directly to the leads
	- for controlled impedance lines you can purchase long narrow 
	  bits of pcb with a thin track (whose width defines the impedance)
	  on one side and self adhesive backing on the other. Simply stick this
	  to the ground plane

Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Inquiry: Need info on Integrated Circuit database software
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Tue, 5 Jan 93 08:40:52 GMT

William T. Dedula (tidedu@ariel.lerc.nasa.gov) wrote:
: Hello;
: I would like to know where I can locate a software package that
: will provide IC chip pinouts and basic chip information on a 
: given package. I know its out there ... I just need to know where
: to locate it. 
: 
: Tim
: 
: 
: W. Tim Dedula                        Internet: 
: N.A.S.A. Lewis Research Center       tdedula@nasamail.nasa.gov
: Mail Stop 77-3                       tidedu@mars.lerc.nasa.gov
: 21000 BrookPark Road                 aa252@cleveland.freenet.edu
: Cleveland, Ohio 44135
: Phone (216) 433-3668
: 
: The National Aeronautics and Space Administration: Science and
: Technology ... for the Benefit of ALL Mankind !!!
 


Tim,
   
     Most major semiconductor manufacturers are now offering their catalogs
on computer disks(most of the ones I've seen have been on 5.25" floppies).
If you write to them I'm sure that they would gladly send you a set of disks
free of charge.  Also, you might find some reader response cards in your majorelectronic trade magazines(EDN is one that comes to my mind) where all you    have to do is circle the number of an article or ad featuring this kind of
product.  Send in the card and, through the magazine, the manufacturer will
send you either information on the product or a sample of the product, or
both.  Ibuilt a complete catalog library and started a computer based library
for semiconductors for my former employer using this method.

     I hope this helps you, Tim.  If you have any questions just leave a
message for me here and I'll see what I can do to help.


Jerry

"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues
: 
Newsgroups: sci.electronics
From: doherty@melpar (Kevin Doherty)
Subject: Re: NEED SOLENOID ACTUATED WATER VALVE.....
Organization: E-Systems, Melpar Division
Date: Wed, 6 Jan 1993 13:10:13 GMT

  I've used the solenoid valves out of a washer under computer control.
They run off 110 volts AC, but a bridge rectifier and emitter follower
let me control 'em with a 68HC11 parallel port.

  You'd need to kludge up an adapter to your copper pipe; sounds like a
trip to the hardware store would do it.

  These valves are quite inexpensive; the duplex unit I used was $15.00
new from an appliance repair outlet.
From: etxansk@garbo
Newsgroups: sci.electronics
Subject: Replacement IR Remote Controls
Date: 4 Jan 93 15:38:40 GMT
Organization: Ericsson
Originator: etxansk@garbod26


 My dad owns a TV set with a faulty remote control. Certain keys started
falling off after years of heavy use, so recently I took out the
circuit board and put it inside a home-brewn (and rather clumsy) keyboard.

 It works, but it's not as convenient as the original thing, and I  
doubt this Philips device of 1984 is still available through retailers.

 Now I've got two questions:

 Does anyone know if different Philips IR remote controls from the
80's with "text" functions use similar IR signals and message
encoding techniques?

 Also, I've seen that there are IR controls available that can record
other IR controls' signals and keep the function set of many different
controls in them. Is it likely that such an all-round control with the
ability to "learn" new signals will be able to record our old device's
signal?

 Thanks in advance,
 Anders Skelander
Newsgroups: sci.electronics
From: csw3503@u.cc.utah.edu (Charles Wen)
Subject: Re: HELP WANTED: How to add a video output socket to a TV?
Organization: University of Utah Computer Center Student Mail Machine
Date: Tue, 12 Jan 93 02:20:19 GMT

In article <C0prIr.LzL@mentor.cc.purdue.edu> cogsdell@mentor.cc.purdue.edu (tony c) writes:
>In article <1993Jan11.231600.3578@fcom.cc.utah.edu> csw3503@u.cc.utah.edu (Charles Wen) writes:
>>
>
>
>Why don't you just use the VCR's tuner??????????

Argh, it can't receive channels over 99, and other connection reasons.

>Take the video feed off TP 12 through a ~47uf cap.

What's TP 12 and how to find it?

Lots of thanks, and e-mail replies if possible. -- Charles

--
(Below you see the Emperor's new signature. :)
Newsgroups: sci.electronics
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Subject: Re: Tube Amplifier Design Questions
Organization: Northeastern Ohio Universities College of Medicine
Date: Fri, 08 Jan 1993 13:15:09 GMT

Sorry about the vacuum tube dyslexia.  Of course, for, "4CX150," I
did mean to write, "4X150A."  Don't know what got into me.  The
rest of what I said stands (at least for now!)


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
From: dag@col.hp.com (David Geiser)
Newsgroups: sci.electronics
Subject: Re: Caller ID "thoughts"
Date: 4 Jan 1993 23:06:40 GMT
Organization: HP Colorado Springs Division
NNTP-Posting-Host: hplsdor.col.hp.com

Why can't you use duotone?
-- 
To know recursion, you must first know recursion.
--

Newsgroups: sci.electronics
From: gary@aragorn.inmos.co.uk (Gary Morton)
Subject: Re: VIDEOCRYPT encryption system by Fergusson
Reply-To: gary@inmos.co.uk (Gary Morton)
Organization: INMOS Limited, Bristol, UK.
Date: Tue, 5 Jan 1993 09:51:34 GMT

In article <76093@apple.apple.COM> apn@Apple.COM (Alex Novickis) writes:
>
>There are usually some patent #'s written on the bottom of the box.
>These and a few hours at the patent office produced several hundreds
>of pages of pretty much the exact "secrets" I was looking for.
>
>
Do you have a list of these patent numbers ? Would you care to
share any of the "secrets" with us ?

--Gary
+---------------------------( Gary Morton )-----------------------------+
|Disclaimer: The opinions above are my own personal views etc.          |
|Inmos Ltd, 1000 Aztec West, Bristol, UK         Email : gary@inmos.com |
+-----------------------( +44 454 616616 X526 )-------------------------+
Newsgroups: sci.electronics
From: ketil@edb.tih.no (Ketil Albertsen,TIH)
Subject: Re: HDTV Question
Organization: T I H / T I S I P 
Posting-Front-End: Winix Conference v 92.05.15  1.20 (running under MS-Windows)
Date: Tue, 12 Jan 1993 11:05:51 GMT

In article <1is3e2INNrvq@rave.larc.nasa.gov>, kludge@grissom.larc.nasa.gov 
(Scott Dorsey) writes:

>>Of course, being digital in no way limits the number of available pitches.
>
>Bzzt, try again.  Being digital does indeed limit the number of available
>pitches.  There is quite a variety of them, and certainly more than the ear
>can pick out, but it's not continuous, since time is being quantized when
>the sampling is taking place.

Could you explain that so that a layman can understand it? 
I am willing to accept it, but incapable of arguing in favor of it. Now,
this is how I am thinking:

Imagine, say, a sine wave of 100 Hz exact as the only sound. That gives 441
samples per full wave - the next maximum value comes 441 samples later than
the previous one. Nyquist claims that (in theory) I can have a perfect 
reproduction of it.

Now a 101 Hz sine wave: The next max value comes 445.41 samples later than
the previous one. This sample does not exist, so the 445 one is "almost max",
the 446 one is "almost max", but the 44,541 one *is* max, exactly at the
right time. Nyquist claims that in theory, this is perfect reproducible.

Now for a 100.01 Hz sine wave --- and the same thing again, leading to the
sample 4,410,441 being exactly perfect, max value.

And so on, down to any frequency precision that you want. And since an
arbitrary complex sound pattern can be represented as a sum of sine waves,
this logic holds for any sound, not only 100.0000??? Hz sine waves.

For any given frequency, there will be a lot of samples that are displaced 
from the signal maximum along the time axis. But the sample value will be
correspondingly off the maximum signal value, too. Whenever n*441/f is an
integer value, the sample will be exactly max at exactly the right time,
no matter the frequency. So the information *is* there, isn't it?

I may be missing out something, but I don't know what!


Newsgroups: sci.electronics
From: xhan@uceng.uc.edu (Xiaoping Han)
Subject: white noise generator using pseudo-random series
Organization: University of Cincinnati
Distribution: usa
Date: Fri, 8 Jan 1993 16:19:43 GMT

Hi netter,
  I am thinking about building a white-noise generator (audio band)
with a pseudo-random series generator, followed by a LP filter
(sort of 1-bit D/A). Any comment, suggestion, etc?
  Does anyone has any information on one-chip solution to pseudo-random
generation (>16 bit)?  Basically there is nothing in it but a
clock, a shift registor and several XOR gates. 

Thanks in advance. email or post are both fine.

Han.                            xhan@uceng.uc.edu
Newsgroups: sci.electronics
From: hcb@netcom.com (H. C. Bowman)
Subject: Re: Do I need FCC approval for small devices?
Summary: It depends...
Organization: Box of Rain Productions
Date: Fri, 8 Jan 1993 21:30:12 GMT

Hullo--

Having taken my first product through the rigors of FCC testing recently,
I am delighted to inform you that the answer is an unqualified "maybe."

The clock-speed exception is probably safely ignored since the FCC
defines a "digital device" as something that uses _digital techniques_
and employs timing signals or pulses whose frequency exceeds 9 KHz.  In
other words, any useful embedded-controller device will interest the FCC.

The useful exceptions center upon where and how the circuit is going
to be used.  Anything designed to be used _exclusively_ on a car,
train, or other moving vehicle is exempt from the emissions testing
requirements.  Anything used _exclusively_ in an appliance (smart
toasters, programmable blenders...) is also exempt.  Industrial
controls, low-low-low power gismos ( < 6 nW), and non-commercial
medical equipment are exempt.  Finally, if your product is meant to be
battery-powered and has no sources higher than 1.705 MHz, then you're
free and clear.  

If you want to consult the applicable canon, call the G.P.O. and order
47CFR parts 0-19.  You'll be interested in section 15 in this case.

If you aren't lucky enough to qualify for the above exemptions, then
I can refer you to a good testing lab.  One thing I strongly suggest,
however, is to avoid designing your own switching power supply: the
"conducted emissions" standards of the FCC (how much switching noise
can appear on the AC mains) aren't kind to the uninitiated.

Good luck!
--Cliff

-- 
| Cliff Bowman     |(501) 968-2232 Voice | As of 1 December, 1992, I was |
| Electronics Wonk |(501) 964-6118 Pager | approximately $1,017,077 shy  |
| Innovation Ind.  |(501) 968-7986 Fax   | of being a millionare.        |
From: gerald.belton@ozonehole.com (Gerald Belton) 
Newsgroups: sci.electronics
Subject: Re: Flywheel batteries as
Date: 12 Jan 93 14:33:00 GMT
Distribution: world
Organization: The Ozone Hole - SKYDIVE New Orleans! - (504)891-3142 16,800 bps
Reply-To: gerald.belton@ozonehole.com (Gerald Belton) 

>>You are totally wrong!  Black powder is NOT a primary explosive.  It will
>>NOT "detonate" if burned in the open.  It will not "detonate" if it is plac
>>in a conceal container such as a bullet casing and ignited.  All BP does is
>>deflagrate and produce a large quantity of gasses.  Do you understand the
>>difference between detonation and deflagration?  The only way to possiblly
>>get black powder to detonate is with a very powderfull detonation to start
>>the process.  It is extremly difficult and blasting caps will not do it.  Y
>>may be thinking of nitrocellulose or "gun powder" it can be made to detonat
>>but again that is extremely difficult.  A substance is said to detonate if
>>the rate of probagation of the burning front through the substance is faste
>>the the speed of sound.  A substance is said to deflagrate when it burn
>>slower than the speed of sound and does not produce a large shock wave whic
>>is the result of detonation.

>Consult the Hazmat database, or the DOT classification schedule. Black
>powder is most definitely classed as an explosive while nitrocellulose
>propellant powder is classed as a flamable solid. You can ship smokeless
>gunpowder UPS, but black powder must be transported by special hazardous
>materials carriers licensed to transport explosives. There is only one
>black powder plant in the US. It is completely remotely operated because
>of the extreme explosion hazard offered by black powder. That's the Hogdon
>Powder Works. In the 19th century, black powder mills were notorious for
>exploding from static electricity or other trivial ignition sources. There
>were only two mining explosives, blasting powder (aka black powder) and
>nitroglycerin in the 19th century. Both were considered extremely dangerous
>to handle. Nobel made his fortune by inventing a safer explosive, dynamite.

I was awakened one night by an blast that shook the windows of my house.
A short time later I saw a number of emergency vehicles and walked down
the road to see what had happened.  It turned out that someone had
dropped a 1 lb. can of black powder on a concrete garage floor, and it
exploded.  All the windows were blown out of the garage, and the guy
that dropped the can was seriously injured.

---
 . SLMR 2.1 . Practice safe eating!  Use Condiments.
 
----
+======================================================================+
| The Ozone Hole - SKYDIVE New Orleans! - (504) 891-3142 HST/DS 16,800 |
| 3 Nodes <> USA Today <> Boardwatch Online <> 5.2 Gigs <> 73900 Files |
+======================================================================+
From: PVossler@cen.ex.ac.uk (P.J.Vossler)
Newsgroups: sci.electronics
Subject: Re: DATA Sheet Needed for LM1881 (sync separator)
Date: 12 Jan 93 14:03:13 GMT
Organization: Computer Unit. - University of Exeter. UK

In article <gregg.8@bss1.umd.edu> gregg@bss1.umd.edu (Gregg Piermarini) writes:

>   Help!
>
>   Does anybody have any info/data sheets etc on a LM1881 chip.  It is a video 
>   sync separator...also, although this may be a really general question..what 
>
>   Gregg
>
Page 3-54 Linear Databook #3 by National Semiconductors

Try contacting them at -
National Semiconductor Corporation
2000 Semiconductor Drive
P.O.Box 58090
Santa Clara 
CA 95052-8090

Tel (408) 721 5000
--
	

===============================================================================
P.J.Vossler, Dept of Physics,	|	Email:p.j.vossler@ex.ac.uk 
University of Exeter		|	Tel  : +44-392-264100
Exeter, Devon, England EX4 4QL  | 	Fax  : +44-392-264111
===============================================================================
-- 
	

===============================================================================
P.J.Vossler, Dept of Physics,	|	Email:p.j.vossler@ex.ac.uk 
University of Exeter		|	Tel  : +44-392-264100
Exeter, Devon, England EX4 4QL  | 	Fax  : +44-392-264111
===============================================================================
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: microphone circuit
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 4 Jan 1993 12:19:59 GMT

Adam Trent Phillips (bb099@cleveland.Freenet.Edu) wrote:

: In a previous article, scottb@sail.LABS.TEK.COM (Scott Baker) says:

: >I'm want to use a frequency counter as a guitar tuner.

Another way to realyse this, is to build a unit which compares the guitar-
frequency with a divided Xtal-frequency. The difference-frequency shows
you the deviation of the guitarfrequency. As a display you can realyse a led-
bar. If the light of example 4 led moves left, the guitar-frequency is 
too low, if the the light moves right, the guitar-frequency is too high.

Greetings from thomas
From: garyg@warren.mentorg.com (Gary Gendel)
Newsgroups: sci.electronics
Subject: Re: MouseSystems Mice
Date: 6 Jan 1993 14:43:48 GMT
Organization: Mentor Graphics Corp. -- IC Group
Distribution: world
Reply-To: garyg@warren.mentorg.com
NNTP-Posting-Host: garyg.warren.mentorg.com

Not exactly the same.  The PC mouse has two buttons and the SUN has three.
In addition, the SUN's LED generates a red glow, and the PC's are not
visible.  I own both and find that the PC mouse seems to have more friction
and sometimes the pad moves instead of the mouse.  However, it is a far cry
better that the mechanical mice I've tried (and last < 6 months of usage).

Gary



Newsgroups: sci.electronics