HDTenEightyP/NetNews huggingface dataset:
From: more_da@pts4.pts.mot.com (DAN MORERA)
Subject: Re: Handling CMOS
Reply-To: more_da@pts4.pts.mot.com
Organization: Paging and Wireless Data Group
Date: Fri, 11 Dec 1992 21:10:03 GMT

In article 30773@yuma.ACNS.ColoState.EDU, gw214790@LANCE.ColoState.Edu (Galen Watts) writes:
>If you use sockets, don't take the chips out of the package until you install
>them.
>The way I install CMOS chips is in the bathroom.  Take the circuit board, all
>the tools you might need and the chips into the b-room and close the door.
>Run the shower on HOT for a few minutes, until the mirror fogs over.  Leave the
>water running (maybe turn it down a little), touch the board and the package the
>IC's are in together, open the package and insert the IC as quickly as possible.
>The idea is to use the high humidity to dissipate any static charges.  
>Frequently touch the board and chip packages together before removing the chips
>just in case.  If you need to remove an IC, do the bathroom stuff, and put the
>chip into a sheet of aluminum foil so the foil touches all the pins.
>
>I've done this for a few years and have NEVER blown a CMOS IC inserting it.
>Blowing it in the circuit is another matter I won't go into.
>
>Good Luck,
>Galen Watts, KF0YJ
>
>
This isn't a flame or anything, but are you serious?  Boy, am I glad I live in
sunny and humid South Florida, because I would hate to take a shower everytime
I play around with CMOS parts.  :-)

I guess a simple ground strap doesn't suffice up there, huh?


---
*********************************************************************
* "Could be worse -- could be raining."  * Daniel Morera            *
*********************************************************************
* "No walruses, please"                  * more_da@pts4.pts.mot.com *
*********************************************************************

Newsgroups: sci.electronics
From: dog@sequent.com (Paul Parenteau)
Subject: Where to find X10 stuff?
Organization: Sequent Computer Systems Inc.
Distribution: or
Date: Wed, 16 Dec 92 19:48:20 GMT

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?

			thanks.... :-)

+-----------------------------------------------------------------------+
 Paul Parenteau				Sequent Computer Systems, Inc.
 OS Software Engineering 

 Phone: (503) 578-4119
 Internet: dog@sequent.COM
 UUCP: { uunet ogicse tektronix } !sequent!dog   
 USmail: 15450 SW Koll Parkway/MS DES2-745/Beaverton, OR 97006

       "Et pour quelque chose de completement differend maintenant.."

+-----------------------------------------------------------------------+
Newsgroups: sci.electronics
From: cs348c00@ibmb8.cs.uiuc.edu (Frank D.)
Subject: Simple question about line-in voltages, please help
Organization: University of Illinois at Urbana-Champaign
Date: Tue, 15 Dec 1992 03:35:58 GMT

Hi,	I have a simple (probably dumb) question regarding the line-in/
line-out voltages of my stereo.  I'd like to digitize it, but don't
know what voltage range it is in.  Since the stereo is at home, I
don't have any scopes handy or any other fancy equiptment.  My volt
meter won't work (i.e. won't tell me any voltages, maybe it's changing
too fast/too small?).   Anyway, if anyone can help me out by telling
my the voltage range, I'd greatly appreciate it!  Also, since this is
my first time playing around w/ the line-in/-out any hints/advice is also
greatly welcomed!

		T H A N K S !!!

Newsgroups: sci.electronics
From: acampane@magnus.acs.ohio-state.edu (Angelo Campanella)
Subject: Re: Halogen Lights
Keywords:   halogen lamp life
Organization: The Ohio State University
Date: Sun, 13 Dec 1992 07:56:29 GMT



to run a halogen lamg:

1/ Use rated voltage or less

2/ Ac and Dc work equally well.

3/ Main difference between these and 115v bulbs is that Halogems have
   been optimized for low voltage (fat filament) and high current.

4/ "Halogen: is usually iodine or the like which has heavy molecules that will
   discourage the sputtering of the filament material away (sputtering
   depletes the filament and otherwise shortens its life).  Deterioration due
   to sputtering is evident by darkening of bulb interior.

5/ Quartz is usually used for the envelope because it expands very little when
   hot.  However, quartz is also very brittle hot or cold, so be careful.

6/ Spots (grease from your fingers) will etch onto the envelope when hot.
   This inceases the amount of heat absorbed by the envelope, leading to
   more deterioration.  So keep your sticky fingers off the envelope:

7/ Any transformer will work as long as it gives 12 volts (or whatever votage
   you need.  The transformer must be rated for the maximum current that
   you expect the lamp to draw.  The controls often supply 6vac ("low" ) and
   12vac ("high").   Thus, an ancient center-tapped filament transformer should
   be perfect for the job.  Precise voltage is not important (i.e. 11v vs 16v).
   Generally, the higher the voltage, the brighter the glow, but the shorter
   the life.

Ang.
Newsgroups: sci.electronics
From: parsytec@ux2.cso.uiuc.edu (Brian Upper - Invoice)
Subject: wanted: old chips
Organization: University of Illinois at Urbana
Distribution: na
Date: Mon, 14 Dec 1992 16:43:07 GMT



HELP!

I'm looking for any source where I can buy the following Signetics chips:
	SCB 68154 C2N40
	N74F764N
	N74F764N-1
	N74F765N
	N74F765N-1

Signetics claims that these chips have been discontinued, even though they
are still in the current catalog.  NO QUANTITY TOO SMALL!!
If you know of any good supplier of old chips in general, please let me
know.  Thank you in advance for your assistance.

Brian Upper
parsytec.ux2.cso.uiuc

P.S.  If this is the wrong news-group, please accept my apologies and
kindly direct me to a more appropriate one.
From: grego@bit.UUCP (Greg Sanguinetti)
Newsgroups: sci.electronics
Subject: Re: Various national colour code of wires (e.g. earth) for elec. plug
Date: 16 Dec 92 21:13:28 GMT
Article-I.D.: bit.538
Reply-To: grego@bit.UUCP (Grego Sanguinetti)
Organization: BIT  Portland, OR

In article <1992Dec15.191356.22205@allegra.att.com> rfc@allegra.att.com (Robert F. Casey) writes:
>Someone mentioned, in this thread, that, in USA, white is only used for the
>neutral power return.  But there is one exception that I've seen:  Imagine
>...
> <gives example of circuit that is hard to wire with correct colors due
>  availability of cables with different colored wires>

In the US, the inspectors don't always care which colors you use between the
junction boxes but they STRONGLY request that you either paint the wires
inside the boxes or wrap them with the appropriately colored plastic tape
so that nobody gets confused in the future. This is true for all places where
the wires can be exposed by removing a plate or opening a door, etc...

It's a good idea to think about the poor schmuck that has to work on your
wiring after you have left!

-grego
-- 
---------------------------------------------------------------------------
Grego Sanguinetti, Bipolar Integrated Technology | Water, water everywhere,
grego@bit.uucp or grego%bit%ogi.cse.edu          | but I'd rather drink
or bit!grego@ogi.cse.edu or ...!ogicse!bit!grego | beer.
Newsgroups: sci.electronics
Subject: Nuclear Magnetic Resonance (NMR/MRI)
From: geoffrey@cosc.canterbury.ac.nz (Geoff Thomas)
Date: Wed, 16 Dec 1992 22:23:57 GMT
Organization: Computer Science,University of Canterbury,New Zealand


I am wondering whether an NMR machine could be run 'inside-out'. As
far as I understand them, NMR imagers consist of a toroidal magnet
system, through which the subject is placed. Would it be possible to
use a bar magnet type of configuration so that the subject didn't
need to be placed within the physical magnet structure?

i.e.
this:				instead of this:
...........			    MMMMMMM
...........			  MMMMMMMMMMM
...........			MMMMMMMMMMMMMMM
MMMMMM.....			MMMM...SS..MMMM
MMMMMM.....			MMMM.SSSS..MMMM
...........			MMMM..SS...MMMM
.SS....S...			MMMM....S..MMMM
SSSS...SS..			MMMMMMMMMMMMMMM
..SSSSSS...			  MMMMMMMMMMM
...........			    MMMMMMM

where:
M = magnet structure
. = magnetic field
S = subject


Can it be done? What range would the system typically be capable
of measuring? How big would it be? How much power would be required?

Any help much appreciated. Thanks in advance,
Geoff Thomas
Xref: sparky sci.electronics:20944 sci.energy:6182 rec.autos.tech:16796
From: jeh@cmkrnl.com
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 01:16:49 PST
Organization: Kernel Mode Consulting, San Diego, CA

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
friction.  I suspect that there could be magnets on the flywheel shaft which
would energize a stator coil placed around the outside of the flywheel container
(tolerances would have to be really tight here).  Or perhaps the entire 
alternator could be put inside the container.  

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.  

Maybe hydraulics?  Hydraulic "motors" have the same great torque as electrics
and can be incredibly small for a given power level.  The hydraulic pump
could be inside the flywheel housing; there could be a bypass valve which would
be cut in for "idling".  You'd lose something to the friction of the fluid in
the piping but not much.  

Maybe the greatest thing about the flywheel is that, if you design the system
right, you brake by turning the system back on itself and pumping energy back
into the flywheel.  (This can be made to work for battery-powered electric cars
too, but it works best with the flywheel, since the flywheel can absorb energy
at just about any rate you can throw at it, while there are strict limits on
how fast you can pump watt-seconds into a battery.)  This gets rid of the
second biggest waster of energy in a car (after the thermal losses in the
engine) -- the brakes! 

(I can't help thinking that if we were more creative about ways to use "waste
heat" we would all be a lot richer (and the Arabs would be poorer). )

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
Newsgroups: sci.electronics
From: whit@carson.u.washington.edu (John Whitmore)
Subject: Re: Transmission line question
Organization: University of Washington, Seattle
Date: Wed, 16 Dec 1992 23:36:39 GMT

In article <sehari.724504235@class1.iastate.edu> sehari@iastate.edu (Babak Sehari) writes:
>In <1992Dec15.202004.15878@ucsu.Colorado.EDU> barr@tramp.Colorado.EDU (BARR DOUG) writes:
>
>>Some specs I have call for ethernet coax to be grounded in one location
>>and one location only!

>If he distance is large enough, and the two end points are at two different
>potentials, you might blow up the whole computer. 

	Not possible.  Ethernet is electrically isolated from your
computer (because the computer is generally grounded, and because
ethernet must, by specification, NOT be grounded, this is obvious).
I think it takes 800V or so of insulation to make a compliant
ethernet port (which is a problem for some printed circuit
wiring practices).

	As previous posters have noted, two problems arise.  Electrical
fault currents can flow in ground wires, and having two connections
to ground makes the ethernet a current-carrying conductor.  
Possible results include melting the ethernet wiring.

	Second, the small stray currents that can be coupled into
the ethernet shield from multiple 'antenna' connections can be
a troublesome noise source, causing many retransmissions.

	The first problem is the more serious: rewiring a half building
of ethernet wiring (etherhose) can make one WISH it had just
fried a PC somewhere.

	John Whitmore
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics
Subject: Re: Flywheel Failure
Date: 20 Dec 1992 23:44:05 GMT
Organization: HST Wide Field/Planetary Camera
Distribution: world
Reply-To: carl@SOL1.GPS.CALTECH.EDU
NNTP-Posting-Host: sol1.gps.caltech.edu

In article <57411@olivea.atc.olivetti.com>, fredl@strobe.ATC.Olivetti.Com (Fred Leffingwell) writes:
>	So Is the real reason for not storing energy in a flywheel
>	the danger?  If so why the comments that the things simply
>	fail in a cotton candy like fluff?

Because the people promoting this technology want you to ignore the law of
conservation of energy, and believe "If it's fluffy, it cant POSSIBLY be
dangerous."   You've fallen for their bullshit hook, line, and sinker.
--------------------------------------------------------------------------------
Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL

Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.  My
understanding of astronomy is purely at the amateur level (or below).  So
unless what I'm saying is directly related to VAX/VMS, don't hold me or my
organization responsible for it.  If it IS related to VAX/VMS, you can try to
hold me responsible for it, but my organization had nothing to do with it.
Newsgroups: sci.electronics
From: akrajn@epas.utoronto.ca (Anita Krajnc)
Subject: Re: Rechargeable lithium batteries?
Organization: University of Toronto - EPAS
Date: Fri, 11 Dec 1992 19:58:11 GMT

The following is a post I found a few months ago about a rechargeable
Lithium batteries for notebook computers.  I've tried to e-mail and
regular-mail the sender of this post for addition infomation about
these batteries.  I am interested in knowing what sizes these
batteries are, what computers do there fit in, how much do they cost,
where can I find/order them, and after 200 charging cycles to what
degree does their performance degrade?

Thanks in advance, Anita Krajnc (Internet: akrajn@epas.utoronto.ca).

>Article: 3433 of comp.sys.laptops
>Newsgroups: comp.sys.laptops
>From: dima@redox.quorus.e-burg.su (Dmitry Kargapolov)
>Subject: New chargeable litium battery ...
>Reply-To: dima@redox.quorus.e-burg.su
>Organization: JSC
>Date: Tue, 23 Jun 92 12:09:35 +0600
>
>		   INFORMATIVE COMMUNICATION
>
>	Trying to increase the in-service time of Notebooks
> OPLUS Company has developed a new rechargeable litium battery with
> high specific properties, permitting to approach the computer's
> off-line mode in-service time, meeting the consumers' requirements.
>
>	The rechargeable litium battery capacity is higher than
> that of the best rechargeable nickel-cadmium batteries by 900%.
> The table provides the data on the in-service time of the Notebook
> on the basis of the CPU 80286 with the employment of
> nickel-cadmium and lithium batteries.
>
>    --------------------------------------------------------
>   :  Rechargeable  : Nominal : Nominal : Average : Battery :
>   :  battery pack  : Voltage : Capacity: Weight  :  Life   :
>   :                :   (V)   :   (Ah)  :   (g)   : (Hours) :
>    --------------------------------------------------------
>   :                :         :         :         :         :
>   :     Ni-Cd      :   9.6   :   2.25  :   500   :   2.3   :
>   :                :         :         :         :         :
>   :    RPS1004     :   9.6   :   20.4  :   500   :  20.4   :
>   :                :         :         :         :         :
>    --------------------------------------------------------
>
>      RPS1004 rechargeable battery service life consists of
> 200 cycles without changing the residual capacitance. The new
> rechargeable battery is redischarge and recharge resistant and
> has an outstanding operate reliability.
>
>	New rechargeable batteries are also to be used
> as power sources in other types of portable strong current
> radio-electronic apparatus: video camcorders, portable
> stereo-complexes etc..
>
>	Aiming at the reduction of industrial enterprises'
> expenditures on new process's introduction at their manufactures
> and shortening of periods of its bringing to a commercial level,
> while developing RPS1004 OPLUS Company has been guided by the
> existing technological basis of litium batteries production with
> the standard lines employment and without those productions'
> maintenance schedule changement.
>
> OPLUS Company Russian Representatives.
> 620042, box 25, Ekaterinburg
> Telephone: (3432) 445-005.
From: kthompso@donald.WichitaKS.NCR.COM (Ken Thompson)
Newsgroups: sci.electronics
Subject: Re: PLD program simulator?
Date: 14 Dec 92 14:53:01 GMT
Organization: NCR Corporation Wichita, KS

batzel@work.seas.upenn.edu (John B. Batzel) writes:

)There are 33 lab groups in a class at my University.  We are currently

)is, we have to use the CUPL language to program the chip.  There are
)about 8 PC's that have CUPL on them, and only one chip programmer.  I
)think you begin to see the problem.

Welcome to the real world.  Better learn to share resources!

-- 
Ken Thompson    N0ITL  
NCR Corp.  Peripheral Products Division   Disk Array Development
3718 N. Rock Road  Wichita KS 67226   (316)636-8783
Ken.Thompson@wichitaks.ncr.com 
Newsgroups: sci.electronics
From: mmpjh@angelo.amd.com (Javed Hussain)
Subject: Source of a chip -----  HELP
Organization: Advanced Micro Devices, Inc.
Distribution: usa
Date: Mon, 14 Dec 1992 23:18:26 GMT


I need help to fine out from where I can get the following chip:
	   
	       CD22402E

Please email me the name, address and phone number of the shop or 
mail order company from where I can get one chip at reasonable 
cost.

Thanks,

Javed   mmpjh@amd.com

From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 11 Dec 1992 23:42:51 GMT
Subject: Re: Signal Integrity?
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> Is anyone on this net interested in the topic of signal integrity?
> This includes crosstalk & refections of signals in high speed digital
> computers.
> 

Sure!  What about it?

Bob (I for one vote in favor of signal integrity, generally) M.
Newsgroups: sci.electronics,rec.audio,alt.guitar,rec.music.makers.guitar
From: george@delta.ee.ufl.edu (George L)
Subject: Re: Tube amp transformers
Date: Sun, 13 Dec 92 05:20:30 GMT

In article <1gagtfINNqru@rave.larc.nasa.gov> kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
>
>True enough.  If you want to build your own, however, you can easily use
>undersized output transformers which will saturate more easily.  I have,
>in fact, seen guitar amps that use old filament transformers for the output
>device; they tend to ring quite a bit because of the uneven phase response
>and have a quality that some folks like a lot.
>--scott
>
While we are on this subject:
I have an old Heathkit W4-B tube amplifier with a blown output transformer.
Anybody got a spare in their junk-box (or know what its specifications 
should be)?

Thanks,
george@alpha.ee.ufl.edu
Newsgroups: sci.electronics
From: boortz@sics.se (Kent Boortz)
Subject: Digitally controlled audio mixer?
Organization: Swedish Institute of Computer Science, Kista
Distribution: sci
Date: Wed, 16 Dec 1992 01:02:18 GMT



I want to build a digitally controlled audio mixer. It should have
for each channel 3 tone controls, sound level, balance, monitor level
so the digitally variable resistor chip has to be cheap.

I have been looking at X9MME and X9CMME. It is a 8 pin DIL with 99
resistors and is controlled by three pins, step, up/down and chip select.
The main advantage is that it is small in size. The disadvantage is 
that it can't be set to a absolute value or be read. It costs $10 each
in sweden so the cost is a bit to high.

Another solution would be to use a DA converter together with a voltage 
controlled level control chip.

Any suggestions of other parts?

/kgb
--
Kent Boortz
boortz@sics.se
Newsgroups: sci.electronics
From: cgordon@vpnet.chi.il.us (gordon hlavenka)
Subject: Re: Making decals on plastic
Organization: Vpnet Public Access
Date: Sat, 12 Dec 1992 04:12:53 GMT

 v064mb9k@ubvmsd.cc.buffalo.edu (NEIL GANDLER) writes:
>  I am developing a small device to sell next year and going to be in a
>simple plastic casing. I want to put a compan decal or just letterin.
>Does anyone know a cheap way of doing this.

A relatively simple and inexpensive way is to use a laser printer.
Print a _mirror image_ of your desired decal onto an overhead
transparency sheet.  Then spray-paint the _toner_ side with a nice
color.  Now, when you look through the sheet, you have a beautiful
label.  True, it's not a decal per se, but it's very nice.  Works best
if you make it to cover the entire front panel.  If you want colored
printing, you'll have to use colored toner.

I saw a variation on this in Midnight Engineering magazine a while
back.

If you don't mind having the toner exposed (where it might get
scratched off) there are several companies which sell clear
adhesive-backed sheets for laser printers.  These make passable
decals, and you can even use those "colorization" kits to snazz things
up.

-- 
----------------------------------------------------
Gordon S. Hlavenka           cgordon@vpnet.chi.il.us
Vote straight ticket Procrastination party Dec. 3rd!
Xref: sparky sci.electronics:21094 sci.energy:6243 rec.autos.tech:16872
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 18 Dec 92 14:19:54 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <BzEsw7.57B@cs.uiuc.edu> morrison@cs.uiuc.edu (Vance Morrison) writes:

>I believe a road worthy flywheel can be made.  The only question is 
>is it worth it.  It might be too heavy or too expensive, or there simply
>might be better ways of storing energy for vehicular applications.

I agree with you that a road worthy flywheel could be made.  I also feel
that all of the methods you mentioned would work.  I just feel that by the
time you add enough fail safe's to the flywheel, it would either be way
to heavy to be practicle, or would be made of so many exotic materials
that it would cost more than most cars do today.
-- 
Mob rule doesn't become any prettier, just because the mob start to call itself
a government.
It ain't charity if you are using someone else's money.
Mark.Wilson@AtlantaGA.NCR.com
Newsgroups: sci.electronics