HDTenEightyP/NetNews huggingface dataset:
From: bwrossma@cantor.math.uwaterloo.ca (Brian Rossmajer)
Subject: Re: Phone line monitor
Organization: University of Waterloo
Date: Wed, 11 Nov 1992 00:53:36 GMT

In article <1992Nov10.135145.6174@bnr.ca> mwandel@bnr.ca (Markus Wandel) 
asks for a phone line monitor.  I`ve been comtemplating this myself
for a while now.  Couldn`t you just hook up an op-amp with the - input
to the phone ground and battery ground and the tip to the + input of 
the op-amp.   Then power an LED off the output of the amp.  With a pot,
If you want to minimize loading, put some precision resistors (say 1 Mohm)
in a voltage divider across the phone line, and your op-amp goes between
ground and tip div 2.

This should be safe and easy, but I haven`t built it and I haven`t done
the calculations.  Has anyone tried it or know immediately why it wouldn`t
work?
--
        bwrossmajer@descartes.uwaterloo.ca          (Brian W. Rossmajer)
 BrI    University of Waterloo; Computer Science, Electrical Engineering
        Disclaimer:  What is truth?  Is mine the same as yours?
Newsgroups: sci.electronics
From: hattori@convex.com (Mato Hattori)
Subject: Re: WANTED: Results of 486DX50 vs 486DX2-66 thread
Date: Fri, 6 Nov 1992 02:25:08 GMT
Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
X-Disclaimer: This message was written by a user at CONVEX Computer
              Corp. The opinions expressed are those of the user and
              not necessarily those of CONVEX.

I agree with you.  DX-50MHz is much faster than DX2-66MHz.
Statistically, my PC with DX-50MHz could finish the Dhrystone
benchmark test in 11.0 seconds.  The documents included with
the program has told me that usually it will take 15 seconds 
with DX2-66MHz.  If someone out there own a PC with DX2-66MHz,
I will send you the program.  Please try it.
--
Mato Hattori                  email: hattori@convex.com
Convex Computer, U.S.A.              (or hattori@csrd.nkk.co.jp)
3000 Waterview Parkway        office: 1+214-497-4304
Richardson, Texas 75083       home:   1+214-424-4655
From: steuer@clam.rutgers.edu (robert Steuer)
Newsgroups: sci.electronics
Subject: Help: What is an Independent Current Source!?
Date: 9 Nov 92 05:11:39 GMT
Organization: Rutgers Univ., New Brunswick, N.J.

I understand an Independent Voltage source is like a battery and I
understand that an Independent Current source can supply a current,
but what is a REAL-LIFE example of an Independent Current Source?
I have asked fellow students, my teachers, even a teacher with a
Doctorate Degree and still I get hmmm, thats a good question!

-------------------------------------------------------------------------------
| Robert Steuer               Internet: steuer@clam.rutgers.edu               |
| Rutgers University          Amateur Radio: KF2EK@N3FOA.#EPA.PA.USA.NA       |
-------------------------------------------------------------------------------
From: cathy@uxa.cso.uiuc.edu (Catherine T Vojtas)
Newsgroups: sci.electronics
Subject: Adding a Second Phone Line
Date: 5 Nov 92 06:16:39 GMT
Article-I.D.: news.Bx8C3s.C70
Organization: University of Illinois at Urbana

I need to install a second line so I can have one for voice, one for data
(can you guess why?)  The installation charge for the labor of putting in
a second phone line is a bit pricey, but the woman at Illinois Bell told 
me that I could do it myself if I knew how...
Anyone know how this is done?  I have some background in basic 
electronics(simple stuff like building a rectifier, etc...) but I think
I could handle it.
Any help would be greatly appreciated..
Thanks.

-- 
----------------------------------------------------------------------------
Catherine Vojtas                        mail to: cathy@uxa.cso.uiuc.edu
University of Illinois at U-C
----------------------------------------------------------------------------
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: need a pulse stretcher
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 11 Nov 1992 10:03:03 GMT

X1FT@VM1.CC.UAKRON.EDU wrote:
: Greetings,
:  
: vibration detector.  I would like the circuit to run on 12v, which precludes
: (without adding a 5 v regulator) the use of a 74123 retriggerable monostable
: multivibrator.  Is there another device, relatively commonly available, that
: that runs on 12v that acts like a 74123 (CMOS maybe?).  Thanks!
:                                                            - Frank

Not is easier than this. Thake a dual-monoflopp from the cmos-family
MC14xxx (MOTOROLA) or CD4xxx (NATIONAL SEMIC. or Second Source).
There are two types of monoflopps, MC14528B or MC14538B. The first
device is for smaller min. pulse. The second device is more stable and
the pulse-width is exactly r*c.

For more information: Have a look in the databook CMOS LOGIC DATA (MOTOROLA)

I hope I can help you.  Greetimg from Thomas
From: psyxsgp@otago.ac.nz
Newsgroups: sci.electronics
Subject: pal video to rgb 
Date: 13 Nov 92 22:43:08 +1300
Organization: University of Otago, Dunedin, New Zealand


	We are looking for a PAL video to rgb converter, preferably one that you can 
buy (cheaply) though a circuit would be better than nothing.

	They must exist since just about every PAL TV must have something like it ..
problem is they do not seem to be about!

	We have an rgb frame grabber ... and want to grab some 
images from a video recorder.

Thanks

-- 
Stephen Pearce, University of Otago, Dunedin, New Zealand.
ph 064-3-4740999 ext 8166 home 064-3-4763778
From: d89-ahg@ludd.luth.se (Anders Hedberg)
Newsgroups: sci.electronics
Subject: PIC programmer.
Summary: Need a PIC 16c5x programmer cheap.
Date: 7 Nov 92 14:07:56 GMT
Organization: Lule} Tekniska H|gskolas Datorf|rening - Ludd

Since I've tried to program a faulty PIC 16C54 in my 'PIC 16C5x SERIES
PROGRAMMER MODEL 8806' it won't read my others 16c5x chips correctly.

I've changed some buffer chips inside the programmer and also the 4053
chip inside the programmer, but when reading the 16C5x chips the
result has changed but it's still wrong...

So, is there some cheap programmer for the PIC 16C5x available???

Microchip lists a company called PARALLAX INC. selling such a thing for
$199, how do I contact them ???

I'm, also interested in other tools for the PIC16C5x series, please mail me!

/Anders Hedberg
Newsgroups: sci.electronics
From: abond@rvgs.vak12ed.edu (Andrew H. Bond)
Subject: Re: Spice ftp sites
Organization: Virginia's Public Education Network (Roanoke)
Distribution: usa
Date: Sun, 08 Nov 92 06:49:24 GMT

wuarchive.wustl.edu has extensive archives on everything under
the sun, including spice and pspice. The version that they have
in a commercial demo program. I have downloaded it and it seems
to be fairly functional, limited only in the number of elements
that can be modeled(20). Offhand I cannot recall the exact
location, try archie to locate the exact path. Hope this helps.
-- 
andrew h bond, 	rvgs	
Xref: sparky sci.electronics:18410 sci.math:14471 sci.logic:1943
From: vgtarcea@vela.acs.oakland.edu (Glenn Tarcea)
Newsgroups: sci.electronics,sci.math,sci.logic
Subject: Minimization of boolean function code needed
Date: 5 Nov 92 22:05:54 GMT
Organization: Oakland University, Rochester MI.


  Hi I'm posting this for a friend of mine. If you could respond
by e-mail I would appreciate it as I don't usually read this
newsgroup (Although I do browse it occassionally. Thanks.
  
  From Friend =>

Needed :   Public Domain Code for Minimizing Boolean Functions

	   I don't care what method (Quine-McCluskey Tabular Method,
	   Scheinman Method, etc.) the code uses for the minimization.
	   Code written in Borland Turbo C would be preferred, but 
	   any language is fine.  Please let me know ASAP - deadlines
           must be met :-)


vgtarcea@vela.acs.oakland.edu
From: rraf@dciem.dciem.dnd.ca (Rob Feltham)
Newsgroups: sci.electronics
Subject: Re: 68HC11 Floating Point Routines
Date: 9 Nov 92 12:49:26 GMT
Organization: Defence and Civil Institute of Environmental Medicine

In article <BxDpBv.JyH@news.cso.uiuc.edu> rg9538@ehsn2.cen.uiuc.edu (Ronald E Garnett) writes:
>
>
>Help!  I'm looking for a library of assembly routines for floating point.
>
>Regards,
>
>Ron Garnett
>
>University of Illinois at Urbana-Champaign
>(Every time i write that, I get thirsty for some reason)

Motorola has an application note "AN974" which is devoted to the MC68HC11
Floating-Point Package. Contact your local Motorola Representative and
they'll get you one. You could also ask for the local Motorola Bulletin
board and download the aprropriate software (if they have it). I would still
recommend gettting the app note.

		Rob Feltham.


-- 
rraf@dretor.dciem.dnd.ca	Rob -aka- rraf
A little competiton never hurt anyone. Quick call an ambulance.
"This will have to serve as a tail until I think/find something wittier."
Standard disclaimer. My opinions do not reflect my employers opinions....
From: n3022@cray.com (Jim Knoll)
Newsgroups: sci.electronics
Subject: Schematics  - VGA Monitor
Keywords: VGA
Date: 11 Nov 92 15:20:29 GMT
Reply-To: n3022@cray.com
Organization: Cray Research, Inc.

I'm looking for a Gateway 2000 VGA monitor schematic.
Does Sams Photofact carry these?
Does anyone have the 1-800 number for Howard Sams?

Jim Knoll
n3022@cray.com
From: ornitz@kodak.kodak.com (Barry Ornitz)
Newsgroups: sci.electronics
Subject: Re: Restrictions on 46/49MHz band?
Summary: FCC Rules Part 15
Keywords: Part 15, Title 47 CFR, unlicensed transmitters, cordless telephones
Date: 7 Nov 92 01:16:52 GMT
Article-I.D.: kodak.1992Nov7.011652.6443
Followup-To: sci.electronics
Distribution: usa
Organization: Eastman Chemical Company

In article <1992Nov5.123811.11033@doug.cae.wisc.edu> kolstad@cae.wisc.edu 
(Joel Kolstad) writes:
>I'm just curious... does anyone out there know the bandwidth limitations
>on the baby monitor/cordless phone/RC car/etc. non-lincensed 46 and 49MHz
>radio bands?

To start with baby monitors must operate between 49.82 and 49.90 MHz. Cordless
telephones operate in the 46.60 to 46.98 and 49.66 to 50.0 MHz bands on 10
assigned channels (actually 10 base transmitter channels at 46 MHz and 10
handset channels at 49 MHz).

>I believe I've heard that the power output is limited to producing an
>E-field of 10000uV/m at a distance of one meter from the transmitting
>antennta (correct me if I'm wrong).  But what is the frequency range
>of the "49MHz band?"  I would assume that I can't start modulating my
>49MHz carrier at 1Mhz, for instance... :-)

Actually the limits are 10,000 uV/m measured at 3 meters.  The detailed rules
are somewhat complicated as to emission bandwidths but basically all of the
energy in the carrier and modulation products must fall within 49.82 to 49.90
MHz band with emissions outside this band being severely limited.  This 
effectively limits your modulation frequencies to 4 kHz or less if you stay
in the center of the band.

The full set of rules can be found in Part 15 of the FCC Rules and Regulations.
Check your local library for the Code of Federal Regulations, Title 47, for
a copy.  There are special provisions for home-built (but not marketed)
devices for this band that are outlined in Part 15.

					Barry
 -----------------
|  ___  ________  |       Dr. Barry L. Ornitz          WA4VZQ
| |  / /        | |       Eastman Kodak Company
| | / /         | |       Eastman Chemical Company Research Laboratories
| |< < K O D A K| |       Process Instrumentation Research Laboratory
| | \ \         | |       P. O. Box 1972, Building 167B
| |__\ \________| |       Kingsport, TN  37662       615/229-4904
|                 |       INTERNET:   ornitz@kodak.com
 -----------------
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: Anyone know a good PLL?
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL6]
Distribution: usa
Date: Tue, 10 Nov 1992 08:22:14 GMT

For pll-circuits have a look in the data-book CMOS/NMOS SPECIAL FUNCTIONS
DATA from MOTORLA. You will seeemany pll-frequency-synthesizer. The compo-
nentserie is MC145xxx. I worked with MC145145 and MC145151. I had no prob-
lems. These ic's have all a feedbackcounter, a reference-forwardcounter and
a phasediscriminator with two kind of outputsignals and a lockedsignal-
output. These ic's have no internal vco. You can take as example the
MC4046 (I dit it so) or others.

So, I hope I can help you. Please tell about your solution on my
E-Mailbox.

Greeting from Thomas
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: Creating sci.semicond
Date: 12 Nov 92 07:33:36 GMT
X-Maildoor: WaflineMail 1.00r


    Babak Sehari entitled a message as 'Creating sci.semiconducto',
   on the 11-09-92  16:57 to All.
 BS> Due to the fact that articles about the world of solid state and 
 BS> semiconductors gets lost in between the other physics and electronics
 BS> news, I suggest a new network wild newsgroup to be created as
                                   ^^^^
            Dure you mean WIDE :) --||  but it may be wild also.

 BS> sci.semiconductors&quantum_electronics.

    how about sci.micro_electronics that would cover both as well
    as include a lot of other "Stuff".

                Stephen Cyberman@Toz.Buffalo.NY.US
             Mangled on Wed  11-11-1992  at 15:49:19

... Then the cat made a sound like someone was fieldcleaning a badger...
--- Blue Wave/QWK v2.10
                                                                                                                         
Xref: sparky sci.electronics:18350 misc.forsale.computers.pc-clone:599 misc.forsale.computers.d:273
From: kolstad@cae.wisc.edu (Joel Kolstad)
Subject: Re: Keypad interface to HC11
Organization: U of Wisconsin-Madison College of Engineering
Date: 10 Nov 92 19:46:10 CST

In article <92315.190637DI3QC@CUNYVM.BITNET> <DI3QC@CUNYVM.BITNET> writes:
>     I am planning to interface a keypad to the io lines of an hc11. Does anyon
>e have any suggestions on connecting a keypad. I was planning to scan the keypa
>d by driving one of the rows hi and testing the columns. I was planning on test
>ing this every 20ms. How would I take care of debouncing etc. Any suggestions.

You're on the right track...

Various places sell row/column encoded keypads.  Even Newark has some new
4x4 keypads that I like a lot (nice feel, you can get different colored
keys, etc.) for a very reasonable $10-$15.  Surplus places often have 
keypads for $1 or less, if you don't care what you're getting. :-)

If you scan every 20ms, you simply don't need to take care of debouncing --
switches don't bounce for anywhere _near_ that long!  (Consider that most
humans can hit a switch twice in somewhat <20ms -- go play with a stop
watch...).

If you're lucky, someone will have already done the code for this, since
it's a pretty common application (although it doesn't take very long to
do it yourself, either).  You might want to check the Motorola BBS for
this stuff.

						---Joel Kolstad
Newsgroups: sci.electronics
From: randy@megatek.com (Randy Davis)
Subject: Re: Big Brother Radio Shack
Reply-To: randy@megatek.com
Organization: Megatek Corporation, San Diego, California
Date: Sat, 7 Nov 1992 00:28:53 GMT

In article <VBREAULT.92Nov6093440@rinhp750.gmr.com> vbreault@rinhp750.gmr.com (Val Breault) writes:
|I don't know about you, but I've always had a great deal of respect 
|for people that can look you in the eye and tell you the plain truth.

  AMEN to that...  Its amazing how much trouble can be caused by some gutless
fool that lies because it supposedly isn't your business, or even to "protect"
you, to not hurt you, etc...  But that's another subject. :-)

  However, I was in Radio Shack two days ago buying a mosfet and some other
assorted small, cheap parts.  When I was walking up to the counter, I
couldn't help but think about this subject thread and wonder whether the
sales-droid was going to ask me my address, etc., especially since I was
paying cash, and what I was going to tell him.  (Its not like its that big
of a deal, they already have it from a while back when I charged something).

  I was all ready for the question, and he hands me my change, the sack, and
a receipt *WITHOUT* asking for ANY info.

  What a letdown... :-)


Randy Davis                            Email: randy@megatek.com
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: beryllium copper
Date: 11 Nov 92 02:15:15 GMT
Article-I.D.: toz.gate.5Ry2TB1w165w
X-Maildoor: WaflineMail 1.00r


    Stan Bischof entitled a message as 'Re: beryllium copper',
   on the 11-05-92  19:46 to All.
 >The real nasty problem is with beryllium oxide heat sinks!
 >The white ceramic looking heaksinks on TO-3 transistors is really nasty.
 >I have heard it said that if anyone takes a file and grinds away at one of
 >these BeO heatsinks, it might kill that indivdual!
 >--

 SB> Yeah, And I've heard that Clinton won't raise our taxes. rumor !=
 SB> truth.
 SB> In the first place, BeO is NOT white (it's black).

    Though your first statement is correct the second is not.
    BeO is generally WHITE in appearance.  Now they made either
    add impurities or use a different process to get black BUT
    reading the Handbook of Chemistry and Physics states it
    WHITE as mr Wallace stated.

    Cyberman
... Missing tagline.  User deleted.
--- Blue Wave/QWK v2.10
                                
Newsgroups: sci.electronics
From: bew@brahms.udel.edu (Ben Williams)
Subject: Re: Big Brother Radio Shack
Summary: Why no competition for Radio Shack?
Keywords: competition, free market, monopoly
Organization: University of Delaware
Date: Sat, 7 Nov 1992 05:35:44 GMT


I've just read this thread containing 50+ complaints about Radio Shack.
What I would like to know is:  Why do we have to shop at RS to get
electronic supplies?  Why aren't there other electronic stores in
competition with RS?  Well, maybe there are in your area (let me know)
but where I live they are the only thing going.  And boy is that ever
frustrating!  Aren't there laws about monopolies?  Aren't we living under
a competitive free-market economy where stores that customers do not like
to go to will be competed with by other stores?  Isn't that the way it's
supposed to work?  I mean, RS does seem to usually have what I am looking
for, but I still would like the option at least to do business elsewhere.
You know, like maybe an electronics store where the salesmen know what
they are talking about...

Ben.

-- 
Ben Williams
bew@brahms.udel.edu

               What we got here is a failure to communicate...
From: Keith.Gallie@FtCollins.NCR.COM (Keith Gallie)
Newsgroups: sci.electronics
Subject: Re: Question on BeO , Be Cu
Date: 11 Nov 92 14:27:47 GMT
	<40689@sdcc12.ucsd.edu> <40690@sdcc12.ucsd.edu>
	<1992Nov8.181413.6384@news2.cis.umn.edu>
Reply-To: Keith.Gallie@FtCollinsCO.NCR.COM
Organization: NCR Microelectronics, Ft. Collins, CO
In-reply-to: aaron@barracuda.micro.umn.edu's message of 8 Nov 92 18:14:13 GMT



I find it difficult to believe that BeCu 'dust' is toxic.

In the micoelectronics biz probe card probes are made of BeCu.
	
The probes a routinely lightly sanded with very fine sandpaper to
remove oxidation. 

Are all the probe card techs in the biz going to die???

I may be wrong about the probe being made out of BeCu, but I don't think so.
--
Keith A. Gallie
Keith.Gallie@FtCollins.NCR.COM - uunet!ncrlnk!ncr-mpd!bach!keithg 
NCR MPD Fort Collins  2001 Danfield Court  Fort Collins, CO 80525 
----------------------------------------------------------------------------
  All thoughts, opinions, etc., are my own. Not that anyone listens to me. 
----------------------------------------------------------------------------
From: lsg001@cck.coventry.ac.uk (Graham Wilson)
Subject: transformer question
Organization: Legal Department - Coventry University
Date: Tue, 10 Nov 1992 20:30:11 GMT



** My parents have a narrow boat which has both 12 volt and 240 volt
   supplies. When the marine engine is running it drives 2 x 75 amp alternators. 
   The two alternators have been adapted and the charging circuitry 
   has been removed. The 150 amp hour power output from the two alternators
   passes into an electronic charging controller called a TWC unit. It is
   the TWC unit which controls the charge rate. The TWC unit supplies
   3 batteries (total capacity) 500 amp hour through a 3 way blocking
   diode. A heat sensor attached to the batteries is connected to the TWC
   unit to detect temperature rises within the cells. I gather that this
   system charges the batteries using something called intelligent 
   charging.

   Initially, when the boat engine is started the two alternators run
   quite hot for the first 15 minutes. After this point, they start to 
   cool down ( I assume as a result of the TWC unit decresing the charging
   rate).

   My father has a portable generator on the boat as well which provides
   240 volts at 50 or 60 Hz. In case the main engine fails he would like
   to use the mains generator to power a 240 volt to 12 volt transformer
   which he could connect into the TWC unit which would provide upto
   150 amp hour in effect taking over the role of the two alternators.

   I was wondering whether it is possible to obtain a 240 to 12 volt
   transformer capable of achieving this and whether it would be 
   possible to conect one side of the transformer to the 240 supply 
   and the other to the TWC unit without needing any other additional
   electronics ? Incidentally, in order to use this transformer would
   the two alternators need to be isolated from the circuit ?

   Thanks for your help in advance.

-- 
         *********************************************************
         *      Graham Wilson      *  lsg001@cck.coventry.ac.uk  *
         *     LL.B.  Law  III     *     Coventry  University    *
         *********************************************************
From: vbreault@rinhp750.gmr.com (Val Breault)
Newsgroups: sci.electronics
Subject: Re: telephone humm any solution...
Date: 12 Nov 92 18:56:31 GMT
Distribution: sci.electronics
Organization: General Motors Research Labs
In-reply-to: heyes@dadev.cebaf.gov's message of 12 Nov 92 14:34:13 GMT

In article <HEYES.92Nov12093414@dadev.cebaf.gov> heyes@dadev.cebaf.gov (Graham Heyes) writes:

              I installed two telephones myself, one in the kitchen
   and one in the bedroom. The one in the kitchen full of electrical
   appliances is fine. The one in the bedroom has a terrible humm.
   I tried swapping the handsets and the humm stays with the 
   bedroom not with the handset. The only electrical equipment in
   there is two table lamps. 

I wonder what's on the other side of the bedroom wall.  Could there
be a television there?  Try extending the wires and moving the 
phone to another part of the bedroom.

-val-
--

Val Breault - GM Research - vbreault@gmr.com - N8OEF
Instrumentation dept., 30500 Mound Rd., Warren, MI 48090-9055
The opinions expressed by the author do not necessarily reflect 
those of GMR or those of the General Motors Corporation.
From: jronnau@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Re: 68HC11E9
Date: 9 Nov 92 07:59:46 CST
Organization: University of Kansas Academic Computing Services

In article <jmarin.721312910@messi.uku.fi>, jmarin@messi.uku.fi (Jukka Marin) writes:
> hampster@phys.ksu.edu  
> I use the 68HC11A1 chip to do this (and much more).  I program the
> EEPROM with the code to do what I want, so I can use single chip
> mode.  I wrote a small utility for my Amigas which programs the HC11
> RAM or EEPROM with one command..  Very fast to update the program
> code within the HC11.
> 
> You'll also need a simple logic circuit to get the HC11 going after
> power-up (it needs a BREAK character from the RS232 to start up). 
> 
 
I thought all you have to do is connect TxD to RxD with a pullup resistor
?
Then it would send itself the break character and go to the EEPROM.  
I guess I'll find out tommorrow when I hook it up!

Jim Ronnau
University of Kansas 
Center for Research inc.
JRONNAU@KUHUB.CC.UKANS.EDU

>   Jukka Marin


>