HDTenEightyP/NetNews huggingface dataset:
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Is lead solder bad for me?
Organization: Motorola Computer Group, Tempe, Az.
Date: Thu, 19 Nov 1992 13:54:38 GMT

In article <1992Nov17.175550.14583@netcom.com> kehoe@netcom.com (Thomas David Kehoe) writes:
>Will I get lead poisoning from breathing the smoke
>from solder?  I work next to an open window, and leave
>the soldering iron on the window sill, but when I'm
>doing close soldering work, I can't avoid breathing
>the smoke form the solder.
>

You can, but you probably will not. Lead poisoning pretty much depends
on the quantity of exposure vs. the length of time. Burning the paint
off of a house implies large exposure in a short time. Hobbiest soldering
on the otherhand is usually infrequent. 

Now, if you are the type of person who worries about such things, here
are the "proper" precautions for soldering.

-Work only in a well ventilated area.
-The work surface should have forced ventilation drawing or blowing
    fumes away from the person soldering and delivering the fumes
    outside or to a proper filter (sub-micron + charcoal).
-The work surface should be of a non-flamable, non-meltable material.
-Do not eat, drink or smoke while soldering.
-Wear safety glasses whenever the iron is hot.
-Keep solder away from eyes and mouth at all times.
-Wash hands thouroughly after holding any solder product.

Do I do this? Well, I have a little muffin fan to clear the smoke and
I do wash my hands after soldering. I'm not real concerned, but then
my employer draws blood (literally) for a lead test every 3 months.

>I've switched to lead-free solder, which is 97% tin and
>3% silver (available at Radio Shack).  The label still
>says to avoid breathing the smoke.  Why doesn't everyone
>use th

The smoke from soldering comes from burning the flux inside the solder,
not from the molten metal. The lead hazard is from particulates, or dust
which can be made if the solder boils, or steam is released. The other
hazard is from the oxides which form on the surface of the solder and
can transfer from the solder to your hands and skin and then be moved
to your mouth.

Industrial users of solder need to consider a wide range of things
while selecting solder formulations, such as, melt point, wettability
to various other metals, flux interaction, joint strength, etc, etc.
A hobbiest on the other hand probably does not care. I would, however,
think that 97%tin solder would be fairly brittle at low temperatures,
but that's a guess.

John

-- 
| ONE LINE NOVEL: She backed away from the corpse slowly, not so much out  |
| of fear, but simply unsure of what the crowd expected her to do with it. |
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
From: 2hujpapaw@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Help! Converting 2400 to 9600 baud.
Date: 17 Nov 92 17:44:05 CST
Organization: University of Kansas Academic Computing Services


Has anyone ever had any luck (or ever tried for that matter) converting
a 2400 baud modem to 9600 baud?  I have heard that it can be done fairly
easily by replacing a few key IC's.  I will try to get the text file to
do it if anyone is interested.

                                     ---Thanks

                                      Brett Nenninger

Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Big NASTY Brother Radio Shack
Organization: AI Programs, University of Georgia, Athens
Date: Tue, 17 Nov 1992 21:46:58 GMT

In article <1ebbu9INN349@grapevine.EBay.Sun.COM> smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
>In article <1992Nov17.071923.7429@njitgw.njit.edu>, dcg5662@hertz.njit.edu (Dave Grabowski (KxiK)) writes:

>> car radio. Grabbed a pack off the shelf, and noticed the price: a
>> whopping 79 cents. A small price to pay for good tunes in the ol' Honda.
>> The salesman scans it, and asks for $1.05 (99 cents plus 6 cents NJ
>> sales tax). Being the consciencious (sp) consumer, I mentioned the
>> twenty cent discrepancy. He refused to do ANYTHING about it -- said that
>
>Interesting. In the UK you could have reported them to the trading
>standards people. 

Or in the US, the local law enforcement people (police or sheriff).
It's equally illegal here.


-- 
:-  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
Newsgroups: sci.electronics
From: mts@wam.umd.edu ()
Subject: Re: 'DreamLight' wanted!
Organization: University of Maryland, College Park
Date: Tue, 17 Nov 1992 04:33:11 GMT

In article <1992Nov16.111944.4390@kth.se> e92_anh@vaxkab.lne.kth.se () writes:
>On Sunday 15 November 1992, I was watching 'Beyond 2000' on Discovery
>channel. One of the wonders they were showing this time was an apparatus
>to -while you're sleeping- detect your REM's and then tell you that you
>are dreaming (by flashing lights in front of your eyes for a while).
>'DreamLight' I think it was called.
>
>Now, the reporter said that this device is something that anyone can buy
>and use. The problem is that 'Beyond 2000' is an American program (I
>think) and I live in Sweden. And as this 'DreamLight' has not yet found
>its way to Sweden, I'd be very happy if someone could tell me WHERE I
>CAN ORDER such a thing...
>
>(Secondly, does it work??)
>
       Well, even if Beyond 2000 is an Australian show, the DreamLight is
avaliable in the US, and I suppose you could get one sent to you.  I think that it is manufactured by the Lucidity Institute here in the US.  This is not the
right place to ask about it, however.  Check alt.dreams there are several ownersand users of the Dreamlight there so you can get the address of where to order one from.  They claim that the light does work after a while of getting used to it.  If you don't get alt.dreams there, let me know and I will ask for you.


      Oh, by the way, although, anyone can buy these things, the sad part is
they sell for around $1000 US dollars each.  Guess you'd have to be really
interested in lucid dreaming to buy one of these.


Dave.
.


Newsgroups: sci.electronics
From: rich@pencil.cs.missouri.edu (Rich Winkel)
Subject: How does this AC test probe work?
Organization: University of Missouri
Date: 21 Nov 92 06:54:39 GMT

I just bought this a few weeks ago.  The outside is all plastic.  It's
the size and shape of a large ballpoint pen, except the tip is closed
and flattened.  It's powered by 2 AAA cells.  When it gets within
about 1/8" of a hot house-current wire (not the neutral), an led lights
in the tip.  It doesn't matter if current is actually flowing in the
wire, and it doesn't matter if I'm near enough to capacitatively
interact with the probe.  

How does it work??

Rich
Newsgroups: sci.electronics
From: u009@csx.cciw.ca (G. Stewart Beal)
Subject: Re: police laser radar
Organization: Canada Centre for Inland Waters
Date: Mon, 23 Nov 1992 16:20:05 GMT

In article <17619@mindlink.bc.ca> Ed_Meyer@mindlink.bc.ca (Ed Meyer) writes:
>>
>> If they find the system on your car, say it is your garage door opener.
>>
>> Better yet, if you're a ham, it's an experimental radio device, since hams
>> can
>> use any freq above 300 GHz.
>>
>
>Just a quick question: is the >300 GHz area open to Hams in Canada?
>
>     Ed Meyer
>
I think >300GHz is a free for all- not controlled by DOC. There is no
enabling regs in Canada for anything above 24GHz. The ITU allocation is
there but the DOC haven't done anything about 47GHz etc.
 
Regards, Stu Beal, VE3MWM, U009@CS.CCIW.CA,
National Water Research Institute, Burlington, Ontario, Canada.
 
"A breathless story that zips along at warp speed... because the characters
are undeveloped and the author has not the least sense of narrative pace."
Newsgroups: sci.electronics
Subject: Open-Collector, Totem-Pole, Tri-State
From: cvafyaga@vmsa.is.csupomona.edu (Srikanth Viswanathan)
Date: 23 Nov 1992 21:53 -0800
Distribution: world
Organization: California Polytechnic University, Pomona
News-Software: VAX/VMS VNEWS 1.41    

Hi!  Could someone please explain the difference (and/or advantages
and disadvantages) of open-collector, totem-pole and tristate?  Thanks!
From: jhwhit01@ulkyvx.louisville.edu
Newsgroups: sci.electronics
Subject: Re: Want to convert RGB to NTSC signals
Date: 20 Nov 92 18:55:41 GMT
Organization: University of Louisville

In article <1992Nov19.232950.24188@serval.net.wsu.edu>, Leonard Hermens <lhermens@eecs.wsu.edu> writes:
> I need to convert RGB (red-green-blue) video signals to NTSC TV
> standard video. I have RGB signals, black and white NTSC, and composite
> sync signals available, but I don't know what device/circuit/wiring
> is required to convert the RGB signals to NTSC.  
> 
> Could someone send me information about exisiting products that do this
> or a
> reference on how to build such a device? I know quite a bit of 
> electronics, but don't know the relationships between RGB and NTSC
> signals.
  
Check out the Motorola MC1377P RGB-to-PAL/NTSC encoder chip.  It costs $2.95
from Jameco, and they will send data sheets for 50 cents.  There is a $30
minimum order, so you might try a local electronics store.  The 1377P will do
what you want with little additional parts (resistors, caps, colorburst crystal
or TTL clock signal).
 
Jeff White         jhwhit01@ulkyvx.louisville.edu
Newsgroups: sci.electronics
From: sja@world.std.com (Stuart J Adams)
Subject: Looking for Wireless modem for Handheld PC
Organization: The World Public Access UNIX, Brookline, MA
Date: Wed, 18 Nov 1992 04:45:23 GMT

I am looking for a wireless modem/network interface for a handheld
type PC.  (ideally in the form of a PCMCIA card).

Thanks,
Stuart Adams
sja@world.std.com
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: How does a clamp-on ammeter work?
Date: Thu, 19 Nov 92 02:34:13 CST
Organization: The Inquiring Mind BBS  1 204 488-1607

ballen@convex.csd.uwm.edu (Bruce Allen) writes:

> The title says it all:
> "How does a clamp-on ammeter work?"
> I'm thinking about one of the gadgets used to measure the 
> current in an automobile charging circuit, for instance.
> It has a pair of thick "jaws" that encircle the lead in 
> question, and a meter that reads out the current passing 
> through the encircled region, without intrusively breaking
> or touching the wire.  Does it sense the B field?  If so, how?
> 	Thanks,
> 		B. Allen
> 
> Please reply to ballen@dirac.phys.uwm.edu
> 

HALL EFFECT DEVICES do the job nicely.

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: keating@rtsg.mot.com (Edward Keating)
Subject: Re: police laser radar
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: usa
Date: Tue, 17 Nov 1992 20:07:28 GMT

dag@col.hp.com (David Geiser) writes:

>> sees at least ond diode.  Modulate the power supply with a little noise (like
>> ignition noise) and the officer won't be able to get a reading that makes any 
>> sense to his machine.

>On second thought, it's fairly easy to descriminate the
>reflections.  In fact, it's probably really necessary given all
>the regular IR stuff out there like your fan blade chopping the
>engine heat, vibrations of the car body due to resonance or 500W
>woofers, etc.

Perhaps it may be easier than you think. All we'll need is the expected 
modulating frequency of the laser and then send back a much more intense
bandswept signal to drown out the reflection. Sorta like trying to 
stargaze during the noonday sun. Does anyone really have the hard spec's on
the wavelength involved and what IR leds would come close to that spec?

-- 
#undef .sig
From: thoad@nb.rockwell.com (Thomas DiGiacomo)
Newsgroups: sci.electronics
Subject: Re: How to build a noise reducer?
Date: 18 Nov 92 17:07:17 GMT
Article-I.D.: nb.1992Nov18.170717.6575
Organization: Rockwell International


In article <zhenya.722059559@ultima>, zhenya@socs.uts.edu.au ( The Firefox.) writes:
> Does anyone have any ideas about the best way to build a device that takes
> an input from an external microphone, shifts the signal 180 degrees out
> of phase, and then re-emits it with little loss of resolution of the
> waveform in the process?
> 
> It would be great if it could also work from frequencies of about 20Hz up...
> 
> Maybe there is a mail-order kit for something similar that someone know...


I assume what you want to do (from your Subject: line) is sound cancellation.
If that is the case, consider that any processing you do on the signal will 
delay its output, so you cannot cancel the sound.  But, the Bose company 
(speakers, etc.) has come up with headphones that cancel much noise, for
helicopter pilots, for example, because the cancellation only has to be done
in the cup of the headphone, and not over a whole room.  (Not only would process-
ing delay the signal, but you'd have to compensate for where the noise was 
coming from -- i.e. worry about room echoes, etc.).

I don't remember where I saw the info about the Bose headphones (Popular Science?)
but do remember that it took much doing to achieve sound cancellation even in
the small, mostly-controllable environment inside the headphone ear cups.



Tom DiGiacomo

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Rockwell International				thoad@nb.rockwell.com
Digital Communications Division			wk: (714) 833-4507
Newport Beach, CA              			hm: (714) 722-5796      
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Newsgroups: sci.electronics
From: nasiom@vccnw10.its.rpi.edu (Milton Peter Nasiopoulos)
Subject: BROKEN TUBE AMP
Reply-To: nasiom@rpi.edu
Organization: Rensselaer Polytechnic Institute, Troy, NY.
Date: Mon, 16 Nov 1992 03:06:52 GMT

Keywords: 
I have a really old tube amp that doesn't work anymore.  I originally got it out of my neighbors trash.  I was in a big wooden box with speakers and a turntable.  I brought it home and salvaged the amp.  It worked GREAT!  After using it for about a week I decided I would have to buy new speakers to get the most out of it.  This is where my trouble starts.  After hooking up the new speakers the amp blew a fuse...and keeps blowing them even if I put the old speakers back.  I suspect that the impedence of the

 new speakers was different and may have shorted out one of the parts in the amp.  
Does anyone know of a way to find the shorted part or a way to find out if that's the problem?  Also, is there a way to find out what impedence speakers I should use?  The old ones don't say but the new ones were 8 ohms.
This amp can handle 150 watts x 3 channels!  I don't have money for a new one and since I have a lot of test equipment at my disposal I would rather fix it myself.  Please Please help me, this amp sounded absolutely awesome.  Oh, I forgot to mention that I had all the tubes tested and they check out O.K.

If you can help please E-Mail me so you don't clutter up the net.  
Thank you so much for any help!!!

Milton Nasiopoulos      nasiom@rpi.edu
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: Need help with xtals and an xtal scanner
Date: Wed, 18 Nov 92 12:43:53 GMT
Reply-To: paula@nlbbs.UUCP
Distribution: world
Organization: The Electronics Workbench


In article <1992Nov17.175341.20447@CERIS.Purdue.EDU> dheisler@CERIS.Purdue.EDU writes:

 > 
 > Actual frequency : just the straight 14x.xxx right?

        No, the actual frequency is the actual minus the i-f (10.8 for
        Bearcat, 10.7 for all other scanners.


 > holder: what's this? Did i misunderstand?

        How is the crystal mounted - solder-in, socket? Which size? I
        don't know the specific type names.


 > tolerance : is that ppm? what's normal for this sort of thing?

        Primarily for transmit crystals. How much can the crystal
        frequency vary over a given range of temperature.


 > load capacity: is that like power capacity? what's normal?

        A crystal operates in parallel or series with a small capacitor
        (load capacitance).


        Now, after all that; get in touch with a company that deals with
        scanners or scanner crystals. They will have all the above info
        on file for the various models.  Look for names in a Scanner
        Guide or communications magazine.

        * * * * * * * * * * * * * *  * * * * * * * * * * * * * * *
	*   Paula Stockholm              paula@nlbbs.UUCP        *
	*  Cumberland, Maine          !nlbbs!paula@uunet.uu.net  *
	* * *  * * * * * * * * * * * * * * * * * * * * * * * * * * 

Newsgroups: sci.electronics
From: berger@atropa (Mike Berger)
Subject: Re: Possible to upgrade PC from FCC Class B to A?
Organization: University of Illinois at Urbana
Date: Mon, 16 Nov 1992 22:50:48 GMT

wlsmith@valve.heart.rri.uwo.ca (Wayne Smith) writes:
>In article <1992Nov16.192730.23028@cbfsb.cb.att.com> vinlai@cbnewsb.cb.att.com (vincent.lai) writes:
>>I posted an article on EMI/RFI a while back and got really good
>>feedback, especially from someone who gave me info from ARRL (Thanks,
>>btw).  After doing a little research, I found out that my PC was FCC
>>Class B, meaning it's supposed to be used in the office.  Guess where
>>it is at this moment?  
>>
>>With this new information, I'm wondering if the methods used to filter
>>out EMI/RFI will still work.  That brings up the idea of digging into
>>the PC hardware to upgrade its FCC Class from B to A.  First, is it
>>possible?  Second, and if so, how to go about it?  Or am I SOL (S--t
>>Out of Luck)?  Thank ya ...

>Why bother?  I mean, does the FCC actually police that kind of thing?
>How many PC's are sold in warehouse and deptartment stores now?  Are
>they class A?  Just how does the FCC get involved with the sale of
>electronic equipment?  Like, is it illegal to sell something that
*----
Actually Class A is worse, not better.  You want class C for home use.
And the reason to maintain the radiation standard isn't to protect yourself
against the radiation police.  It's to ensure that you don't ruin your
neighbors' stereo and TV reception.  If you are running approved Class C
equipment, then the fault is probably in their consumer equipment, and
not your problem.  If they have interference and you are running
unapproved equipment, then you may be liable for damages.  So if you're
in a house of your own, unlikely to spoil somebody elses's stereo receiver
or TV reception, then go ahead and set things up.  But be prepared for
interference problems inside your own home, and to handle neighbors'
problems as they arise, especially if you live in an apartment.
--
	Mike Berger
	Internet    berger@atropa.stat.uiuc.edu
Newsgroups: sci.electronics
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: Software Toolworks C for Z80?
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Tue, 17 Nov 1992 13:01:39 GMT
X-Newsreader: TIN [version 1.1 PL6]

Yes you are right. I still have it on my S-100 system in the basement.
The also distributed CNIX which was a UNIX like shell for CPM that tied
easily to Toolworks C. I am not sure if they are still around. There is
a similar named company that sells software I think.

Newsgroups: sci.electronics
From: S_FAEHNLE@rzmain.rz.uni-ulm.de (Faehnle Thomas)
Subject: HELP!!! Need 80386dx/80486dx pinout!
Organization: University of Ulm, Germany
Date: Fri, 20 Nov 1992 09:50:38 GMT
X-News-Reader: VMS NEWS 1.24

Has anyone got the pinout of the 80386dx and/or the 80486dx uP ??

I need it URGENTLY !!


With best regards, Bye.
Lines: 6
Date: Tue, 17 Nov 92 19:41:41 MST
From: haymoree@bones (Edward Haymore)
Subject: TI video DAC sources?
Newsgroups: sci.electronics
Organization: Brigham Young University, Provo UT USA
Distribution: usa
Keywords: DAC
X-Newsreader: Tin 1.1 PL4

Any suggestions on where I can find a TI TLC5602 video DAC?


--
Ed Haymore
ed_haymore@byu.edu
From: elston@acavax.lynchburg.edu
Newsgroups: sci.electronics
Subject: HELP.   VCR trouble
Date: 22 Nov 92 17:29:41 -0500
Organization: Lynchburg College


got an old RCA VCR that puts out (from a tape) audio but no video.
looked at the heads and they are clean and there is continuity, just no video
output.  do heads go bad?  
I havent traced the board because its one of those hi-fi versions that has 20
pounds of crap stuffed inside a 5 pound bag.
any clues?


help me please. this is (was) a christmas present for someone.

Zac Elston
elston@acavax.lynchburg.edu

Newsgroups: sci.electronics
From: abond@rvgs.vak12ed.edu (Andrew H. Bond)
Subject: Re: Compiler for 68HC11
Organization: Virginia's Public Education Network (Roanoke)
Date: Tue, 17 Nov 92 07:54:42 GMT

furman@leland.Stanford.EDU  writes:
> 
> Does anyone out there have a decent compiler (preferably
> C but assembly is OK) for the Motorola MC68HC11?
> 
> It doesn't make a difference if it runs under DOS or Windows. 
> 
> If you do, please send e-mail to me at
> (and/or send the zipped files to me)
>  
> furman@leland.stanford.edu
> 
> Thanks in advance,
> 
> Elliot
> 

I know of some archive sites for 68hc11 software:compilers,
utilities, monitors, etc...

ftp to:

hpcsos.col.hp.com	/misc/motorola/68hc11
			/misc/ns32k/beowolf/a-68hc11
bode.ee.ualberta.ca	/pub/dos/motorola/68hc11
calvin.stanford.edu	/motorola/68hc11
ee.utah.edu		/admin		(assem68hc11.c)

I hope this helps. If you have any questions, I'm at:

	abond@rvgs.vak12ed.edu
--AHB
-- 
Andrew H. Bond, Roanoke Valley Graduate Center
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Possible to upgrade PC from FCC Class B to A?
Organization: AI Programs, University of Georgia, Athens
Date: Tue, 17 Nov 1992 04:45:04 GMT

I think B is actually the better of the two classes (i.e., class B is
suitable for residential use, Class A isn't).  So don't downgrade it
from class B to class A!

You can do lots of things to reduce emissions; visit any Radio Shack for
ideas.  But if you mean you want the FCC to certify the computer as 
another class, that would be very expensive.

As I understand it, it's not illegal to _use_ an office-grade computer
in a residential setting, it's just illegal to _sell_ it as suitable for
such use.

-- 
:-  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
Xref: sparky sci.electronics:19119 sci.engr.mech:542
From: hshine@bcm.tmc.edu (Harold David Shine)
Newsgroups: sci.electronics,sci.engr.mech
Subject: High-temp. elect. motors
Followup-To: sci.electronics
Date: 18 Nov 1992 14:53:57 GMT
Organization: Baylor College of Medicine, Houston, Tx
NNTP-Posting-Host: bcm.tmc.edu
Keywords: motors; high-temperature

Do small electric (AC) motors exist that can function in high
temperature (500 F / 270 C) environments?
If so, where should I look for more information?

Thanks, H. David Shine, Neurosurgery, Baylor College of Medicine, Houston
        hshine@bcm.tmc.edu


Newsgroups: sci.electronics
From: zhenya@socs.uts.edu.au ( The Firefox.)
Subject: How to build a noise reducer?
Organization: Computing Sciences, Uni of Technology, Sydney.
Date: 18 Nov 92 04:05:59 GMT

Does anyone have any ideas about the best way to build a device that takes
an input from an external microphone, shifts the signal 180 degrees out
of phase, and then re-emits it with little loss of resolution of the
waveform in the process?

It would be great if it could also work from frequencies of about 20Hz up...

Maybe there is a mail-order kit for something similar that someone know of?

Thanks in advance....
Zhenya.
--
Ring Bad News BBS - +61 2 587-8441
-------------------------------------------------------------------------------
| _    /| |`I am not	  |(Enter your next mistake?)% ar m God   |	  /// |
| \'o.0'  |  the Messiah!'| ar: God does not exist		  |	 ///  |
| =(___)= |		  |---------------------------------------| \\\ ///   |
|    U    |	   Brian. |-zhenya@socs.uts.edu.au---The Firefox.-|  \\X//    |
-------------------------------------------------------------------------------
Newsgroups: sci.electronics