HDTenEightyP/NetNews huggingface dataset:
From: rubin@skiing.cis.ohio-state.edu (Daniel Rubin)
Subject: Re: Flywheel batteries as EV power source
Organization: The Ohio State University Dept. of Computer and Info. Science
Date: Mon, 11 Jan 1993 04:10:45 GMT

>I urge you not to try this experiment at home. Blackpowder is a primary
>explosive rather than a flamable solid. It can explode *unconfined*
>when ignited in amounts of 1 pound or more. That explosion will be more
>intense than that of a similar amount of dynamite, which will also 
>explode unconfined. To dispose of blackpowder safely by burning, you
>must spread it thinly along the ground in trains and ignite only one
>end, allowing it to burn *slowly* with the heat rapidly conducted away
>by the large mass of air to which it is exposed.

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.

There is no way you can compare black powder and TNT.  TNT is a primary
explosive, but you still need some sort of a shock wave to initiate it.  
Placing a match to TNT itself will not detontate it, aloughth I would not
do that!

Black powder is not a primary explosive!

-- 

             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!
Xref: sparky sci.electronics:22298 comp.sys.mac.misc:21552 comp.sys.mac.hardware:25584
From: rcamama@ccwf.cc.utexas.edu (Robert Camama)
Newsgroups: sci.electronics,comp.sys.mac.misc,comp.sys.mac.hardware
Subject: Mac+ compatible data acquisition modules--any suggestions?
Date: 9 Jan 93 07:41:46 GMT
Reply-To: rcamama@ccwf.cc.utexas.edu (Robert Camama)
Followup-To: sci.electronics
Organization: The University of Texas at Austin, Austin TX
Originator: rcamama@tramp.cc.utexas.edu

I've been wondering...I have been looking for a Mac+-compatible data 
acquisition module.  The only one I know of is the Common Sense CNX four-input
data acquisition module, running for $349 at Radiant Enterprises of San Fran-
cisco, CA.  Does anyone know 
 
        1)  Of a data acquisition module such as the CNX, but at a lower 
                price?
        2)  Of a data acquisition module with TWO data inputs (I'm on a tight
                budget, and I might go for a two input design if available)?
 
Thanx,
Bob 
 
	BTW:  Thanx to those who have replied to my previous post, asking for 
help on solar cell testing in preparation for UT@Austin's entry into Sunrayce
1993. 
Xref: sparky sci.electronics:22220 sci.energy:6730 rec.autos:31241
From: rubin@skiing.cis.ohio-state.edu (Daniel Rubin)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 8 Jan 93 01:04:01 GMT
Organization: The Ohio State University Dept. of Computer and Info. Science

>    Well, I just can't let this one pass...I have to add my $.02 to this
>*interminable* thread.  Would anyone out there care to be in the same car,
>or for that matter within several hundred yards of a car, where 200 lb of
>water had suddenly and very rapidly been converted to superheated steam? 
>This would convert the whole car and occupents (sp?) to a large
>fragmentation grendade.  Just because something is vaporized does not mean
>it is rendered harmless; hot, expanding gases are what do the damage in all
>explosions.  When water is vaporized, it's volume increases ~1000X, so that
>200lb of water(25 gallons) suddenly wants to take up 25,000 gallons; wants
>to *bad*.  If constrained to remain at its original volume, it will be at
>1000 atmospheres, attained within microseconds.  The pressure vessel
>capable of containing this *will* weigh more than a battery pack, or a car.

Well I didn't want to get involved with this discussion but...

I think comparing expanding gases or fluff or whatever in a flywheel and 
that of gunpowder in a gun barrel is not justified.  The gasses released
from black powder in a gun barrel act to push an object to "mach 1" or
whatever speed was posted earlier in ONE direction.  You cannot compare this
to gas or whatever explaning in 3-D space.  I pile of black powder won't move
an object placed on top of it at all or a very small amount, probably 1/100000
the acceleration of it in a barrel.  That actally turns out to be a great
example. In a previous post it was said that 7 grains of black powder can
push a bullet to mach 1.  That may be true IN A GUN BARREL.  Take 1 pound of
black powder and place it on the ground and put a bullet on top of the pile.
Light the pile and you get a lot of fire and heat and the bullet will most
likely not even budge, just get really hot!  I wish I could include the 
amount of hot gasses released from a pound of black powder as compared to 
7 grains, but I can't and the ratio between 7 grains and 1 pound should
describe the situation well enough...

I am not saying flywheels are safe or they will work, actually I said very
little about flywheels here ;-)

								  - Dan



-- 

             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!
From: shaffer-wendy@MINERVA.CIS.YALE.EDU (Wendy Shaffer)
Newsgroups: sci.electronics
Subject: Re: Telephone "in use" light
Date: 9 Jan 1993 22:01:25 -0500
Organization: Yale University Science & Engineering UNIX(tm), New Haven, CT 06520-2158
NNTP-Posting-Host: minerva.cis.yale.edu

Regarding the telephone in use light, the Feb issue of Popular Electronics has
a schematic.  Unfortunately, I'm completely unfamiliar with how the telephone lines
work.
The schematic shows two wires going to the telephone line.  One of them is marked with the word "Tip" and a + sign.  The other is marked with "Ring" and 
a minus sign.  Could somebody fill me in on what these mean and how to identify
one from the other.  Thanks
---Wendy
shaffer@minerva.cis.yale.edu
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Thermocouple based temperature controller
Date: 12 Jan 93 06:01:47 GMT
Article-I.D.: shelley.1itmsbINN71k
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <C0Int7.4wu@max.physics.sunysb.edu> danube@max.physics.sunysb.edu writes:

>   I need to control the temperature of a small infrared window to 
>0.1 degrees C or better.  The actual value need not be so precise, but
>changes in temperature must be kept to a minumum.  At present, the
>window is heated by a ring of brass wrapped with heater wire. Adjusting
>the current changes the temperature, which is typically 100-200 C.
>The temperature is measured with a thermocouple (5 mil Chromel-Alumel wire,
>"type K").

	Thermocouple amplifiers are usually good instrumentation
amplifiers (uA725 being one inexpensive model), and must be operated
in a temperature-stable environment (read: closed metal box)
with some kind of 'cold junction' compensation.  There are 
dozens of application circuits in the (for instance) National
Semiconductor Linear Applications Handbook for this kind
of gizmo.  Analog Devices' AD509 is a handy cold junction
compensation device, as well, and there's application support
from Analog Devices for it.

>   Finally, though TC's are prefered, I can also use a silicon diode
>to measure temp (though not to 600 C).  

	And, the diode forward voltage (nominally 0.7V) is proportional
to temperature, so the output voltage varies by circa 2 mV/C; the
signal is a lot bigger, and the corresponding precision of the
amplifier is less.  Don't use a simple switching diode, though;
use a transistor B-E junction (collector shorted to base) instead,
because switch diodes are FAR from perfect diodes (due to the tricks
used to gain either higher current capacity or lower forward capacitance).

	A medium power transistor, such as 2N3019 or 2N3053,
is rated for normal operation at 200C; plastic package
transistors, glass or plastic diodes, are not, usually.

	There's really no hard trick in making the circuit up; you
know how to add voltages (summing junction), how to difference
voltages (difference amplifier) and how to amplify by a constant
voltage gain; once you have a constant voltage source and
a source with a known temperature coefficient, the thermocouple
amplifier and cold junction compensator are easy to build.

	John Whitmore
From: mce5921@bcstec.ca.boeing.com (Martin Emde)
Subject: Re: Sort of a Joke - sad though...
Organization: Boeing
Distribution: na
Date: Fri, 8 Jan 1993 00:29:19 GMT

In article <1if757INNjlf@transfer.stratus.com> det@phlan.sw.stratus.com (David Toland) writes:
>In article <1if650INNt9a@hp-col.col.hp.com> cab@col.hp.com (Chris Best) writes:
>[someone else writes, no attribution given]:
>>> If I remember, the Nintendo manual say that you should not connect
>>> the game to projection TVs. Anyone know why? 
>>Just a guess, since I know little of Nintendo (and I like
>>it this way) - if they offer a device that senses screen
>>position when you aim it at the TV (like a pistol, or isn't 
>>there some sort of shoulder-held bazooka now?), it probably
>>won't (or won't) work properly.  
>>
>>To answer what you MIGHT be asking, it won't hurt the TV.
>
>Bzzzt.  Sorry, that is incorrect.  It *will* harm the TV.  Projection TV
>systems are particularly sensitive to CRT "burn", a desensitization of
>the phosphors from prolonged firing.  Video games often have fixed layouts
>in high contrast and strong color, so after a few hours of playing your
>favorite game you may find a ghost of it is permanently a part of
>everything you watch on that TV.
>
>By the way, the gun (which reads the "flying spot" of the video trace
>from the screen), should work adequately with projection TV, so that is
>*not* the problem.
>
Can anyone out there be more specific as to how those games work
that sense screen position?  How does it compensate for different
sized images and varying distances from the TV?

Thanks,

-martin
-- 
Martin C Emde  <mce5921@bcstec.boeing.com>  uunet!bcstec!mce5921 
Boeing Commercial Airplane Group - 777 Electrical Systems
Renton, Washington  USA
Newsgroups: sci.electronics
From: rich@pencil.cs.missouri.edu (Rich Winkel)
Subject: Re: Microwave Oven Plasma Etcher?
Keywords: microwave, Reike and Hartree diagrams, Gerling Labs
Organization: University of Missouri
Date:  6 Jan 93 23:08:38 GMT

In <1993Jan6.160107.19682@kodak.kodak.com> ornitz@kodak.kodak.com (Barry x24904/ER/167B-TED) writes:

>[...] Finding Reike and
>Hartree diagrams for the tubes used in home ovens will be necessary if you
>plan to modify the power supply in your home-style oven.

Can anyone explain what a "Reike and Hartree diagram" is?

Rich
From: ferguson@andy.bgsu.edu (Douglas Ferguson)
Newsgroups: sci.electronics
Subject: Re: Genesis A/V connector pinout wanted.
Date: 5 Jan 93 20:57:17 GMT
Distribution: usa
Organization: Bowling Green State University B.G., Oh.

stlucas@gdwest.gd.com (Joseph St. Lucas) writes:
> I bought the kids a Sega Genesis this Christmas, and  am in dire need of
> finding out the pinout of the 8-pin DIN connector on the console.
> The manual describes it as a Video Jack (RGB output p.11), but on p 10
> says "If your composite TV or monitor has Video and Audio input jacks,...
> you can use the optional Sega A/V cable for inproved (their spelling)
> graphics and sound. No other connectors are necessary."
> CUrrently the set is hooked up to the big TV, and the kids have a
> monitor for their computer just waiting to have this 
> hooked up.
> With the other info that has been put on the list, does anyone have this?
> I suppose I could buy one, get the ohmmeter out, then return it. But I'd
> rather not.  Thanks.

Starting from the 1 o'clock position, looking at the Genesis from the back,
and going clockwise, the pins are:  red, audio, +5 volts, ground, green,
composite video, and negative combined sync, with blue on the center pin.



-- 
Douglas Ferguson, Ph.D.			Phone:    419/372-6007
Bowling Green State University		Internet: ferguson@andy.bgsu.edu
Bowling Green, Ohio  43403		Bitnet:   ferguson@bgsuopie
Newsgroups: sci.electronics
From: etxaper@eos.ericsson.se (Anders Persson)
Subject: rs-232
Reply-To: Anders.Persson@eos.ericsson.se (Anders Persson)
Organization: Ericsson Telecom AB
Date: Mon, 11 Jan 1993 13:27:12 GMT

Hello!
Is there someone, who knows anything about
rs-232 timing specifikation?
From: mpaul@unlinfo.unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: Re: PC BOARD ETCHING QUESTIO
Date: 6 Jan 1993 13:57:25 GMT
Organization: University of Nebraska--Lincoln	
Distribution: world
NNTP-Posting-Host: unlinfo.unl.edu

chris.guli@factory.com (Chris Guli)  writes:

>My main problem with home fabrication is getting the negative - does
>anyone have a fast/cheap way of getting a high quality negative on film
>? (SMT features)

Well, when our university Photo Productions lab makes PC board negatives
for us, I believe they are making contact negatives.  I.E. the paper artwork
is placed directly over the film in the darkroom and exposed.  (I could
be wrong, they may be using their "normal" exposure equipment).  Anyway,
even if that's not how our lab is doing it, it _is_ a way that _you_
can do it.  Exposing the film then requires only a simple light table
of some sort, and of course I assume you can whip up a home darkroom
set up to develop the results.

I haven't done this, but I've been told by someone else that the film
you want for making these negatives is Kodalith.  If would seem to me
that if you have a choice about it, you would want to produce your artwork
on paper that is as translucent as possible, such as vellum or similar.  
(It's what we use when we do our India-ink pen plots from AutoCAD or
Criterion.)

--
paul marxhausen .... ....... ............. ............ ............ .......... 
 .. . .  . . . university of nebraska - lincoln .  . . .. . .  .. . . . . . . .
 .     .    .  .   .     .   .  .    .   .  .   .    .   .  grace .   .    .  . 
   .         .       .      .        .        .      .        .   happens .     
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Detecting Sine Wave freq
Organization: AI Programs, University of Georgia, Athens
Date: Tue, 12 Jan 1993 05:17:56 GMT

How sharp a transition do you want at the ends of the range?
Do you want it to reject 44.999 MHz but accept 45.000?  Or is it
acceptable to have a range of unreliable behavior just outside
the ends?  (I.e., 44.0 definitely rejected, 44.5 may or may not
be accepted, 45.0 definitely accepted?)

-- 
:-  Michael A. Covington     internet mcovingt@uga.cc.uga.edu :    *****
:-  Artificial Intelligence Programs       phone 706 542-0358 :  *********
:-  The University of Georgia                fax 706 542-0349 :   *  *  *
:-  Athens, Georgia 30602-7415 U.S.A.     amateur radio N4TMI :  ** *** **
From: doherty@melpar (Kevin Doherty)
Subject: Re: Clock doubling-HELP REQUIRED
Organization: E-Systems, Melpar Division
Date: Tue, 12 Jan 1993 12:57:02 GMT

  If you're not concerned about duty cycle, I'd recommend an edge detector
instead.  It's an X-OR gate, with the clock fed into one input, and a
delayed version of the clock into the other.  The output is a pulse train,
with a pulse occurring for each clock edge that is as wide as the delay
used on the input.

  Example:

	      +------+      +------+      +-----
IN	------+      +------+      +------+    

	      +-+    +-+    +-+    +-+    +-+
OUT	------+ +----+ +----+ +----+ +----+ +---

  The interval between output pulses is a function of the input duty cycle;
interpulse intervals will be equal only for a 50% DC input.
From: slmdj@cc.usu.edu
Newsgroups: sci.electronics
Subject: Have old tubes, need info...
Date: 11 Jan 93 12:15:27 MDT
Organization: Utah State University

As a member of the local CAP squadron, I happened to come across a *bunch* of
old tubes (some transmitter, some ????)  and am looking for more info on these
guys.  I have looked at both our university library and the local library. 
Alas, none of these have sources for the info I would like.  Anyone out there
got any ideas or helps???

Thanks,
-- 
********************************************************************************
      Paul Cowley      *             "If you tell the truth,
   ==EE Undergrad==    *                  you don't have to remember anything."
 Utah State University *                       --Mark Twain
  C/A1C  CAP Utah Wing *
   slmdj@cc.usu.edu    *
********************************************************************************
Newsgroups: sci.electronics,alt.radio.pirate
From: svaldez@ocf.berkeley.edu (Steve Valdez)
Subject: >= 5W AM-band amp design?
Organization: U.C. Berkeley Open Computing Facility
Date: Sun, 10 Jan 1993 00:58:56 GMT
X-Posted-From: planecrash.berkeley.edu
NNTP-Posting-Host: sol.ctr.columbia.edu

   CVan someone point me to a source for a circuit design which
   can take the 100mw output from my Panaxis AM transmitter (at 1500kHz)
   and amplify it to somewhere between 5W and 20 or 30W?  

   How does one create an amp in parallel to provide greater gain?

   svaldez@sdcc13.ucsd.edu
   svaldez@ocf.berkeley.edu

Xref: sparky sci.electronics:22128 rec.games.programmer:5299
From: cab@col.hp.com (Chris Best)
Newsgroups: sci.electronics,rec.games.programmer
Subject: Re: Sort of a Joke - sad though...
Date: 6 Jan 1993 21:31:46 GMT
Organization: your service
Distribution: na
NNTP-Posting-Host: hpctdke.col.hp.com

Re: Nintendo damage to projection TVs

I stand corrected - I didn't think of burn-in.
Electronically it would work fine.

I still suspect that locating the "flying spot" 
might be a bit difficult though, unless all three
CRTs are perfectly synchronized.  And if they're
not, would one alone be bright enough?  Which one
would it see?  Or are they close enough that it
doesn't matter?

As I said the first time - just my guesses.
Newsgroups: sci.electronics
From: ua123@freenet.victoria.bc.ca (Matthew A. Skala)
Subject: IR remote control summary!
Reply-To: ua123@freenet.victoria.bc.ca (Matthew A. Skala)
Organization: The Victoria Freenet Association (VIFA), Victoria, B.C. Canada
Date: Mon, 4 Jan 1993 19:33:47 GMT



Many thanks to all who sent me info on IR remote controls for VCRs. 
Here's a summary of the information I got:

brianr@tekig1.pen.tek.com (Brian Rhodefer) says that Radio Shack makes an
IR receiver module that could be used - it contains a phototransistor,
tuned amplifier, and demodulator that operates at 40 kHz.

bbs.haymore@tsoft.net (Ed Haymore) says that his friend was experimenting
with this sort of thing and most VCRs used a carrier frequency of about 38
kHz, digital on-off-keying modulation.

jmorriso@ee.ubc.ca (John Paul Morrison) says that most VCRs use digital
pulses of 40 kHz carrier.

So based on this information, it sounds like a frequency of 40 kHz is
pretty standard as a carrier.  So what I plan to do is use a 567 tone
decoder to demodulate the signal, a 555 to modulate, when sampling just
time-stamp the edges of the modulation and play that back into the 555 at
40 kHz.  This is very short-range, so it doesn't matter if the transmit
frequency is a bit off and is just on the edge of the VCR receiver's passband.

Again, many thanks to all who tried to help - I'm new to Usenet and you've
all given me a warm welcome.
-- 
CENSORSHIP SUCKS!  UP WITH THE PEOPLE!

Matthew Skala - VE7MSK - ua123@freenet.victoria.bc.ca
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Why etch? Is copper deposition possible?
Date: 13 Jan 93 04:08:09 GMT
Article-I.D.: shelley.1j04j9INN505
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <C0nqAB.55B@gantz.bowlgreen.oh.us> gantzm@gantz.bowlgreen.oh.us (Michael L. Gantz) writes:
>I have been reading all the articles concerning the etching of circuit
>boards, something I have a great need to do.  And they all assume that
>one would be etching the copper off of the board.  Is it possible for
>the home hobbyist to devise a system to deposit copper onto blank
>boards?

	There are commercial processes that deposit copper (and
some really fancy ones, that use a laser and chemical pyrolysis,  to
literally draw wires with a light pen), but these are generally
unsatisfactory.

	The plated-on copper coating is brittle and subject to
cracking (not desirable features), so glued-on copper sheet and
subtractive processes are preferred.  There ARE some plating
baths that don't have the cracking problem, but these are not
suitable for home use (and aren't easy to use commercially, either).

	Plated-through holes are the only additive copper processing
that most fabricators can reliably employ.

	John Whitmore
Newsgroups: sci.electronics
From: hart@cheshire (James A. Hart)
Subject: Re: Replacement IR Remote Controls
Organization: TRW Inc., Redondo Beach, CA
X-Newsreader: Tin 1.1 PL4
Date: Tue, 12 Jan 93 22:32:25 GMT

root@fangorn.hacktic.nl (Root Account) writes:
: etxansk@garbo writes:
: 
: >  Does anyone know if different Philips IR remote controls from the
: > 80's with "text" functions use similar IR signals and message
: > encoding techniques?
: 
: Yep. All those philips things use the RC5 remote control system, which was 
: developped by philips. have used it for about forever... So philips remotes 
: that are for the same machine (i.e. TV remotes, VCR remotes, CD player 
: remotes) are interchangeble. I tested this myself with a <1980 remote and a 
: 1987 VCR. Works just fine. Also, if there's anything wrong, my local Philips 
: Service Centre just sells some universal remote control... No known problems.
: 
: >  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?
: 
: Yeah, sure. Those things just sample the IR and record it. So if it says 
: that it can record all other remote signals, it most probably will.... And 
: the philips system is a very widely used one, so almost everything 
: "universal" will be compatible.... 
: 
: hope this helps,
: 
: bram smits
: 

--
Also, several of the 'universal' replacements already know the functions of
almost every tv you can name.  No training.  The 'Four for One' Ive got
know Philips, and maps to all of the usual romote keys.

Name:        Jim Hart    N6JSS
InterNet:    hart@donald.etdesg.TRW.COM 
                         I'd rather be LANDSAILING!
Xref: sparky sci.electronics:22212 sci.energy:6724 rec.autos:31224