HDTenEightyP/NetNews huggingface dataset:
From: cstadbg@csv.warwick.ac.uk (Mr M J Brown)
Newsgroups: sci.electronics
Subject: Re: Vector wire pencils
Date: 31 Dec 1992 12:33:03 -0000
Organization: Computing Services, University of Warwick, UK
NNTP-Posting-Host: lily.csv.warwick.ac.uk

In article <1992Dec21.152708.11873@kong.gsfc.nasa.gov> stephens@kong.gsfc.nasa.gov (mark stephens) writes:
>Are these useful?  They are the "pencils" which wrap a wire around a post
>and you then solder it.  I'm trying to determine what system to use for

I dont like the look of wire wrapping ... it doesnt look to reliable to me
but then again, there are many companies that use it .... I wont though!

>creating circuits for this new (to me)  hobby.  Etching seems to be a tad
>much for (probably) one shot boards and wire wrapping might be overkill. 

Etching is a pain if done with transfers onto copper board etc.... using
the UV senstitve boards is a big improvement, just draw with a nice black
pen on the board and stick it in the sun!

>With the pencil, do you need special posts for inserting into a perf
>board?

My favourite, for one shot stuff is to use Veroboard (Probably a trademark)
which is like perfboard but with copper tracks running down the back. There
are variants on this, such as holes grouped in threes or fives, but I find
it very easy to use, and more reliable than perfboard, where you have to
interwire the components on the back (yuk!)

=============================================================================  
     _/      _/   _/   _/  _/   _/_/_/_/   |
    _/_/  _/_/   _/   _/_/     _/          |         Michael Brown
   _/  _/  _/   _/   _/       _/_/         |
  _/      _/   _/   _/_/     _/            |   cstadbg@csv.warwick.ac.uk
 _/      _/   _/   _/  _/   _/_/_/_/  _/   |     mjb@dcs.warwick.ac.uk
                                           |    csulo@csv.warwick.ac.uk
=============================================================================

Newsgroups: sci.electronics
From: silver@fraser.sfu.ca (Craig Silver)
Subject: Can LED segments be fixed?
Organization: Simon Fraser University, Burnaby, B.C., Canada
Distribution: na
Date: Mon, 4 Jan 1993 02:32:04 GMT

I have an old tv converter.  It's a Jerold, the one with the remote 
that takes a 9 volt.  Some of the red LED segments that make up the 
channel display don't light up anymore.  I know the converter is 
probably not worth fixing, but I'm just curious as to whether or 
not these things can be done at a barable cost.
-- 

----------------------------------------------------------------------
Craig Silver	           Computer Science at Simon Fraser University
silver@sfu.ca (Internet)   Burnaby, B.C., Canada
Newsgroups: sci.electronics
From: uchrgrh@Msu.oscs.montana.edu
Subject: help needed building water level sensor
Reply-To: uchrgrh@Msu.oscs.montana.edu
Organization: Montana State University
Date: Tue, 22 Dec 1992 16:35:16 GMT

I would like to build a solid state device that would turn off a water
pump in my aquarium if the water level drops  below a certain level.
I am willing to look at prefabricated stuff but would prefer to build it
my self.
I would like to put the level sensor on the prefilter which hangs over 
the back of the tank and the rest of circuit in the cabinet below the tank.
The reason for the circuit is mostly to save the pump, which relys on water 
for lubrication, shoud it start to suck air.

Many thanks in advance!!!
Rich
p.s. email or news network....I read them both.
From: glen.mead@canrem.com (glen mead)
Newsgroups: sci.electronics
Subject: printed circuit generatin
Date: 3 Jan 93 18:41:58 GMT
Reply-To: "glen mead" <glen.mead@canrem.com>
Distribution: sci
Organization: Canada Remote Systems

bhertz@terapin.com (Ben Hertz) writes:

BH>what I originally thought it did.  I am hoping for a program which I tel
BH>I need connected to what other things, and it spits out a pattern. Maybe
BH>too much too ask, I don't know.
BH>        Anyway, if someone out there knows of a shareware program that c
BH>Printed Circuit patterns, or where I could get one, I'd like to hear fro

I would also appreciate this information if somebody would be so kind as
to forward any information to me.  I would prefer something that runs on
an XT (8088).

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
Newsgroups: sci.electronics
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Subject: Re: Basic bench equipment query
Organization: Northeastern Ohio Universities College of Medicine
Date: Mon, 21 Dec 1992 14:21:38 GMT

If you are going to do much digital work, you really should try to
get a 100 Mhz - 150 MHz bandwidth scope.  To make reasonably
accurate rise time measurements, you need approximately 10 times
input bandwidth versus the repetition rate of the signal.  Yes, it
is possible to compute rise times from a scope with a more limited
bandwidth, but it is rather inconvenient and best left as an
exercise for an engineering school measurement techniques course.

I've got an old Tektronix 547 at home that has a less than 30 MHz
bandwidth, but that is somewhat mitigated by having a 1S1 sampler
plug-in unit for > 1 GHz sampling, but that is only useful for
repetitive signals.

Having extended bandwidth also assists greatly for spotting
glitches in pulses.  You'll definitely appreciate that if you do
any fiddling around with digital stuff.  I've had a Tek 2445 on my
bench here at work for about 8 years now, and have been quite
pleased with it.  The 2445 doesn't have nearly the bells and
whistles of some of the newer units, but it does have 150 MHz
bandwidth, four inputs, triggered/delayed/intensified sweep and
measurement cursors.  I'd imagine that 2445s are probably starting
to come down in price in the surplus market now.  In the unlikely
event a 2445 shows up at a hamfest, it is usually gone in a few
minutes.

By the way, if anybody has a working 1L5 spectrum analyzer plug-in
to get rid of, I might be interested....


-- 
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
Newsgroups: sci.electronics
From: "glen mead" <glen.mead@canrem.com>
Subject: sony str 790 &^^^ help me
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 29 Dec 92 22:46:55 EST

winchebs@cda.mrs.umn.edu (Benjamin S Winchester 1429580) writes:

BS>I own a Sony STR-790 surround sound and have the following problem.  Wit
BS>Scott speakers up front and two Infinity's in the rear (and a center one
BS>of course) when I turn up the volume a *bit* loud, crackling can be hear
 
This is very interesting.  How old is the unit?  A friend of mine just
purchased a Sony surround sound receiver which I beleive is the same model
and he's currently on his third.  The first one had a defective remote and
some LED on the main unit refused to turn off fully (something else too I
believe).  The second one seemed to be fully functional but it produced a
continuous hum until it warmed up (several minutes later).  He was told
that it was because his satellite speakers where 4 ohms and not 8 but the
owners manual seems to indicate that 4 ohm speakers are fine.  I'm not
sure if he's received the third yet but I'm curious to see if it's DOA as
well.  This sounds very uncharacteristic of Sony.

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
From: RMCCU@CUNYVM.BITNET (Robert Chambers)
Newsgroups: sci.electronics
Subject: Re: Railroad crossing gates -the ups and downs???
Date: 21 Dec 92 18:33:03 GMT
Organization: CUNY/UCC VM Systems

You might post to Rec.Railroad about this, there are some real life
railroaders present in that group that could probably tell you more
about what makes the gates work than you ever wanted to know.

Robert
From: karol+@pitt.edu (Filip M. Gieszczykiewicz (fmgst+@pitt.edu))
Newsgroups: sci.electronics
Subject: Re: Flywheel batteries as EV power source
Summary: simple example
Date: 3 Jan 93 15:39:31 GMT
Followup-To: sci.electronics
Organization: University of Pittsburgh

In article <1hnu1lINNnna@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
>
>Wrong shock wave.  You see, what we've got is a highly stresed flywheel.  If
>some bit of it separates, then the stress on the rest of the flywheel changes. 
>Because of the degree of stress involved.  This change in stress propagates as
>a shock wave THROUGH THE MATERIAL OF THE FLYWHEEL.  Because of the speeds and
>stresses we're talking about here, that shockwave travelling through the
>flywheel is likely to be enough to cause catastrophic failure of the rest of
>the flywheel.

	Greetings. While this may be hard for some folks to visualize,
	I can attest. A friend of mine was flying a twin engine
	plane when one of the propeller blades splintered. He said that
	the whole plane vibrated so badly that he could not see clearly.
	The procedure is to reduce speed to idle and land AS FAST as
	possible. I have seen pictures of what happens when a single
	engine plane breaks a WHOLE propeller blade and it ain't pretty!

	(FYI: read some accident reports that the FAA has about some
	of the prop failures and you'll see that a flywheel with just
	a tiny bit missing is in danger/process of vaporizing... Also,
	in case anyone wants to fool around, the FAA BBS number is 
	1-800-245-3828 but be considerate for the pilots who use it)

	Take care and remember the ultimate rule of every pilot:
	"You're ALWAYS looking for a place to land."
-- 
-------------------------------------------------------------------------------
DO NOT REPLY HERE. REPLY TO "fmgst+@pitt.edu". THANK YOU. If that doesn't work,
send that e-mail to "fmg@alpha.smi.med.pitt.edu". Proud co-owner of a Jeanie's
Teenie serial# 1: all-Al, 285lb, low-wing, 53 hp, 120 knts, experimental plane!!
From: stephens@kong.gsfc.nasa.gov (mark stephens)
Newsgroups: sci.electronics
Subject: Vector wire pencils
Date: 21 Dec 92 15:27:08 GMT
Organization: NASA/GSFC
X-Xxmessage-Id: <A75B4CDF8501EC3D@mstephens.gsfc.nasa.gov>
X-Xxdate: Mon, 21 Dec 92 10:28:47 GMT
X-Useragent: Nuntius v1.1.1d12

Are these useful?  They are the "pencils" which wrap a wire around a post
and you then solder it.  I'm trying to determine what system to use for
creating circuits for this new (to me)  hobby.  Etching seems to be a tad
much for (probably) one shot boards and wire wrapping might be overkill. 
With the pencil, do you need special posts for inserting into a perf
board?

     mark
From: baden@sys6626.bison.mb.ca (baden de bari)
Newsgroups: sci.electronics
Subject: Re: [* NINTENDO PG PINNOUT... *]
Date: Mon, 21 Dec 92 20:02:02 CST
Organization: System 6626 BBS, Winnipeg Manitoba Canada

 
        Re: Nindendo PG
 
                I was also wondering if the PG system can be configured 
to detect head pitch and yaw.
 
                Thanks.
        >>Baden<<

Newsgroups: sci.electronics
From: jon@sparcplug.iupui.edu (Jon Burgoyne)
Subject: Info on ViewSonic 1 or 6
Reply-To: jon@cnc.iupui.edu
Organization: Purdue University - School of Engr. and Tech.
Date: Tue, 29 Dec 92 16:50:56 GMT

Searching the Wisdom of the net,

I wonder if anyone has run across these monitors and/or knows anywhere to get
service info about them, or even schematics?  

Please reply to e-mail, any help appreciated...

Jon Burgoyne
Purdue University - Indianapolis
jon@cnc.iupui.edu
From: jcw@kd4dts.dixie.com (John C. Wren)
Newsgroups: sci.electronics
Subject: Home Automation Newsgroups
Summary: Looking For Home Automation Newsgroups
Keywords: Home Automation Newsgroups
Date: 21 Dec 92 03:57:31 GMT
Organization: kd4dts

Does anyone know of a newsgroup on the net that pretty much stays confined
to the home automation arena?  I'm making plans for building my next house,
which will contain a full home automation system, and am looking for folks
to correspond with.  I am aware of the 2-3 magazines specializing in this
field, but would like a more interactive medium.
-- 
--------------------------------------------------------------------------------
John C. Wren (kd4dts)			|  Word Prefect 5.1:  The choice of
jcw@kd4dts.dixie.com			|    religious scribes everywhere.
..!emory!rsiatl!kd4dts!jcw		|
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: How full is a nicad
Date: Sun, 27 Dec 1992 04:10:31 GMT
Organization: U of Toronto Zoology

In article <1992Dec22.170146.21708@nmsu.edu> kcarver@dante.nmsu.edu (Kenneth Carver) writes:
>>>>I believe you can tell how full a nicad is from it's Voltage...
>>>No, you can't.  This is one of the fun problems of building a NiCd charger.
>>>The output-voltage curve of a NiCd is essentially flat from pretty nearly
>>>full charge to pretty nearly empty.
>
>Ah, but there *is* a way to determine when full charge is reached.

That's why I said "pretty nearly". :-)  Yes, you can detect full charge by
being tricky, but it's nothing so simple as just measuring the voltage,
and it won't help determine the state of a partially-discharged cell.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: More HeNe's for sale !
Date: 31 Dec 92 10:26:23 CST
Organization: University of Kansas Academic Computing Services

I just got another 25 of the HeNe modules in (I asked the guy I get these from
how many he had...would you believe 450 ! ! !). Anyway, these are the same as
before. They are .8mW to 1.2mW red (632.8Nm) HeNe modules with power supply.
They run off of +12VDC at 600mA. They also have the capability of TTL control
(I.E. true when low, +5vdc off). They are new surplus from the bar code
industry. They measure 6.5"L x 2.25"H x 1.25" W. I am selling them for $45
plus $5 shipping (overseas shipping cost more :-( I noticed that the same
module is being sold by dealers like Meredith Instruments for $75 plus $10
shipping. They are rated as a Class II laser device (except for the >1mW which
is Class IIIa). If you ever wanted to play with a laser but the bucks were to
high, this is the way to go.....

-=-= Wes =-=-
Newsgroups: sci.electronics
From: jimh@pacdata.uucp (Jim Harkins)
Subject: Re: Ranking the Electronic magazines.
Organization: Pacific Data Products
Date: Wed, 23 Dec 1992 20:00:59 GMT

In article <1992Dec15.000315.13857@ssc.com> markz@ssc.com (Mark Zenier) writes:
>Trade Press magazines.
>
>Content: What's new and how to use it.
>Disadvantage: Controlled circulation.  Qualify or forget it (or pay a lot
>of money)

I don't know about the rest of you but when I fill out those 'qualifying'
subscriptions I lie through my teeth.  Don't we all by Cray's by the roomfull
on a weekly basis?

A few years ago I was trying to drop a subscription and ignored the re-
subscribe stuff (this for a DEC rag of some sort).  Some sales slime called
me and kept trying to get me to subscribe.  I told him I threw them in the
trash still in their plastic mailing bags and he said that was fine, as long
as I subscribed!  Ya gotta wonder.

jim

-- 
Plumbers Motto:  A flush beats a full house.
--------------------------------------------------------------
Jim Harkins                         [ucsd|uunet]!pacdata!jim
Pacific Data Products               jim@pacdata.com
--------------------------------------------------------------

Newsgroups: sci.electronics
From: strong@tc.fluke.COM (Norm Strong)
Subject: Re: Flywheel batteries as EV power source
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Date: Tue, 22 Dec 1992 19:19:00 GMT

In article <1992Dec16.232521.14672@mtu.edu> cmwolf@mtu.edu (christopher m. wolf) writes:
}andyh@chaos.cs.brandeis.edu (Andrew J. Huang) writes:
}>In article <1992Dec15.194558.2556@adobe.com> pngai@adobe.com (Phil Ngai) 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.
}
}They are supposedly designed within a box held at a vacuum (sp?), with
}the box string enough to contain them, I thought.
}
}>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
}>for elephant.  If it explodes, you measure the explosion.  If not,
}>send it to Ralph Nader for further tests.
}
}There is a different between shooting it and having it break up though.  

Here are the numbers:  A flywheel capable of driving a car as far as 10
gallons of gas in an internal combustion engine, if it ruptures, will
cause the same damage as a bomb containing 200lbs of TNT.  

I'm assuming 28% efficiency for the IC engine and 100% efficiency for
the flywheel engine. 
-- 

Norm Strong  (strong@tc.fluke.com)
2528 31st S.   Seattle WA 98144   USA
Xref: sparky sci.electronics:21713 sci.energy:6496 rec.autos.tech:17240
From: Ted_Eugene_Viens@cup.portal.com
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: Tue, 29 Dec 92 19:25:19 PST
Organization: The Portal System (TM)
  <51713@seismo.CSS.GOV>

>In article <72306@cup.portal.com>, Ted_Eugene_Viens@cup.portal.com writes:
>> Jim many people have brought this up with fantasies of cars failing to bank
>> on corners and rolling wildly on hilly roads.  This rest on the ignored
>> assumption that the housing is rigidly mounted on the car frame.  If the
>> housing is mounted on flexible elastic mounts, the gyroscopic effects on
>> the car could be brought lower than the effects of a heavy set friend
>> bopping to heavy metal in the back seat.
>
>Ok, let's just check that.  Angular momentum (L) of the rotor is the energy
>stored divided by the angular velocity.  The energy stored is about 92000 kCal
.
>The angular velocity is anywhere from 2775 radians/s to 40,000, given the
>various designs posted.  At 2775, this gives about 140,000 J-s.
>Now, let's say you take 5 seconds to make a 90 degree turn.  Torque is
>the change in angular momentum over time.  The vector direction of the
>change in torque is tangential to the curve, and the torque is 1.414*L/5
>or about 40,000 N-m.  How about the bopper?  Let's say he's 200 kg (big),
>and is able to swing his body back and forth (180 degree) once a second
>and is 2 meters tall (we'll assume he's standing, and all his weight is in his
>head).  That's a heck of a bopper.  Ok, L=200*2*2*pi = 2500 J-s, and torque
>would be 5000 N-m, 1/8th of the slow-rotating big flywheel in a turn
>(the flywheel was 100 kg and 1 meter radius).  A smaller flywheel would
>exert less torque due to its higher velocity (this seems counter-intuitive,
>but it is true since energy is constant and energy goes as v^2, while
>momentum goes as v).  Of course, no one can bop like the bopper I proposed,
>and most turns succeed in much less than 5 seconds, so it would be a very
>small flywheel that would actually store the 92000 kCal and still exert
>less torque than your bopping buddy.  However, such flywheels are beyond the
>strength limits of any material, so they are figments of the imagination.
>
>
>--
>Richard Stead
>Center for Seismic Studies
>Arlington, VA
>stead@seismo.css.gov
>
Thanks Richard, for the informative and civil response.  Again, I have been
too lazy this weekend to run down to the library to obtain my own copies of
the physics equations, but my foggy memory of physics seems to follow your
math.  I did not notice in your response any reference to a flexible mount
for the FB.  I have seen 400 pound men oscillating on dance floors at more
than 1 Hz, and if the precessional torgue was reduced by a factor of eight
by a combination of flexible mounting and reduced rotor diameter, your treat-
ment of this issue appears to support my original position.  Thanks for your
support...  Bye...  Ted..
Newsgroups: sci.electronics
From: "glen mead" <glen.mead@canrem.com>
Subject: lasers/collimated light i
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 31 Dec 92 13:51:42 EST

nagle@netcom.com (John Nagle) writes:

JN>      I suspect you are seeing a xenon lamp fronted by a color wheel and
JN>mirror galvonometers, all computer controlled.  These are now a common
JN>disco lighting gadget.  The beam is collimated well enough that it looks
JN>like a laser beam, but it isn't.  Look for leakage of white light from
JN>the unit.

Hmmm, I'd never heard of this before.  I can't get close enough to the
unit to check it out but I haven't seen any hint of white light.  It's
quite an impressive system...they project animations and phrases as well
as all kinds of graphics and lissajous figures with the unit.  Is this all
possible with a Xenon lamp?  Do you have any more info on this subject?

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
Newsgroups: sci.electronics
From: andy@laguna.santafe.edu (Andy Mell)
Subject: Casio Digital Diary SF4300 Serial Comms?
Date: Fri, 25 Dec 92 23:32:04 GMT
Organization: Santa Fe Institute

I just got this fancy SF4300 Casio digital diary for christmas, it has
a stereo 2.5mm jack on one side of it for datacomms. Apparently I need
an FA-100 interface box to be able to connect it to my PC, these seem
to cost a lot of money, more than the diary itself.

Does anyone know what the pinout of the jack is, and whether it is
RS232 compatible? Please email any replies to me (I dont get to read 
this group much these days)

many thanks.

Andy

-- 
-------------------------------------------------------------------------------
Andy Mell, Applied Physics Department,  |   andy@santafe.edu
University of Hull, Hull, HU7 6RX       |   amell@nyx.cs.du.edu
England.                                |   torq@gnu.ai.mit.edu
Newsgroups: sci.electronics
From: alpha@vpnet.chi.il.us (Randy Sales)
Subject: Re: Where to find X10 stuff?
Organization: Vpnet - Free Usenet access
X-Newsreader: TIN [version 1.1 PL8]
Distribution: or
Date: Tue, 22 Dec 1992 04:31:01 GMT

Philip Peake (philip@mentorg.com) wrote:
: In article <1992Dec16.194820.9279@sequent.com>, dog@sequent.com (Paul Parenteau) writes:
: |> I'm looking for a local or fairly local source of X10/Powerhouse modules
: |> and controllers.
: |> 
: |> Sears used to carry the stuff.  Heath/Zenith used to, but they went out of
: |> business.
: |> 
: |> Radio Shack sometimes has their stuff, but I gave up on them years ago.
: |> 
: |> I know I can mail order from X10 directly, but there must be someone in the
: |> greater Portland area who stocks this stuff.  
: |> 
: |> Does anyone know?

: The Incredible Universe has some - unfortunately,
: Incredible Universe = Tandy = Radio Shack, but at least its
: an "up market" Radio Shack ...

: Philip



I could help. I am an X10 dealer. Email me for information and I will send
it via email.  I also carry the Enerlogic programmable controller that works
with the x10 system.

Randy

Xref: sparky sci.electronics:21535 sci.energy:6437 rec.autos:30476