HDTenEightyP/NetNews huggingface dataset:
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: No Clean Solder Flux
Date: Mon, 05 Oct 92 08:23:13 CDT
Organization: The Inquiring Mind BBS  1 204 488-1607

Bob.Clarke%bbs@actcnews.res.utc.com (Bob Clarke) writes:

> Anyone using NO CLEAN SOLDER FLUX in a wave solder process in the
> Aerospace industry?
> If you tried it and now don't use it, why?
> If you are or are about to try it, would you like to open a dialog?
> I realize there isn't many manufacturing type questions on
> sci.electronics, anyone know of a more appropriate forum?
> --
> Bob Clarke, user of the UnixBBS System @ actcnews.res.utc.com
> E-Mail: Bob.Clarke%bbs@actcnews.res.utc.com
> ========================================================================
>    United Technologies Corporation
>    Opinions expressed do not necessarily represent UTC.

This is one areospace doesn't need to stay behind industry.
There are several no clean fluxes around or WATER soluable flux, so
you don't need FREON solvents or other non friendly chems.

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: dcm2@kepler.unh.edu (Tommy the Cat)
Subject: Re: HELP! NEED A TRACKING DEVICE.
Organization: University of Never Went
Date: Sun, 4 Oct 1992 22:26:07 GMT

In article <1992Oct1.214039.8530@edinboro.edu> w644171c@edinboro.edu writes:
>I'm looking for a electronic tracking device, kit or assembled form.
>A few ex-military friends and I were approached by the college R.O.T.C.'s
>to have a friendly war game.  We intend to win ! ! !  
>We hope to place tracking devices on them and take them prisoners without
>
>firing a shot.

I am also interested in tracking devices....preferable of the maximum
range I can get my hands on... (well, nothing over 10 mile radius :-)  )

please post or email me too...
thanks,
-chris
-- 
"Tommy the Cat" David (Chris) Mackensen 
dcm2@kepler.unh.edu, dcm2@bifur.unh.edu		I am the Time Daemon
Newsgroups: sci.electronics
From: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
Subject: Re: Help! My CD player sk-sk-sk-sk-skips
Reply-To: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
Organization: University of Trondheim, NORWAY
Date: Mon, 28 Sep 92 10:18:26 EDT

Thus spoke the keyboard of kevinlu@yoyo.cc.monash.edu.au (Kevin Lu):
>Speaking of CDs, just HOW durable are they?
>
>I've develop a scratch on one of my CDs and now the CD player doesn't play
>one track correctly (i.e it skips, but only on that track on that cd). I
>though these things were supposed to be durable!. SO whats the story?

I also got a CD with a scratch that make my CD sk-sk....ski...skip.
Someone have told me that there might be some cure for the CD, but I
have never find any cure for the CD. Does anyone know if there is any
cure? What about heating the CD up a bit for a long time hoping that the
scratch edges get rounder and perhaps make the scratch smoother so that
more information become readable again?

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+
* I went back to my mother,           * Joern Yngve Dahl-Stamnes           *
* I said, "I'm crazy ma, help me!"    * University of Trondheim            *
* She said, "I know how it feels son, * The Norwegian Institute of Tech.   *
* 'cause it runs in the family."      * Division of Physical Electronics   *
*       - The Who, Quadrophenia       * e-mail: dahls@fhydra.dnet.unit.no  *
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+-+-+-+-+-+-+
From: bh725@cleveland.Freenet.Edu (Werner J. Karl)
Newsgroups: sci.electronics
Subject: PSPICE Part ".MODEL" FTP SITES? Where?
Date: 26 Sep 1992 07:43:43 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: hela.ins.cwru.edu


Are there any FTP Servers out on the Net that have such kind
of things for PSPICE ??
Thanx previously,Werner
Newsgroups: sci.electronics
From: topgun@chaos.cs.brandeis.edu (Chandra Bajpai)
Subject: Re: Help! My CD player skips (Another CD Suggestion Needed)
Organization: Brandeis University
Date: Mon, 28 Sep 1992 01:37:31 GMT



I too have a old (1988) Sony Portable Discman.  My player are a stranger
problem - It loses tracking.  But, only after it has been used for a while
(30 minutes, or less on a hot day).  It will then not seek to a specified
track, or if it does if a track it will play with a weird sandpaper like
rythmic sound in the background.

I brought it down to a CD repair place thinking all it needed was
an alignment.  The guys gave it back to me, saying the laser in the
unit was "weak".  He claimed the new laser mechanism would be over $150, so
it would be better to get a new player.  I really don't have alot of confidence
in this diagnosis.

I have never heard of a weak laser. I am capable of fixing (or at least trying)
the mechanism if I had some pointers.  Are any of the adjustments in the 
PCB for the laser signal strength?  Did this guy make a correct diagnosis?

Thanksfor all your help,

Chandra Bajpai
topgun@brandeis.cs.edu
From: exumfox@exu.ericsson.se (Mike Fox)
Newsgroups: sci.electronics
Subject: Re: Telephone interface
Date: 6 Oct 92 23:24:22 GMT
Reply-To: exumfox@exu.ericsson.se
Organization: Ericsson Network Systems
X-Disclaimer: This article was posted by a user at Ericsson in North America.
              The opinions expressed are strictly those of the user and
              not necessarily those of Ericsson.

In article 1agi51INNc58@usenet.INS.CWRU.Edu, at847@cleveland.Freenet.Edu (Jeff Hunsinger) writes:
> 
> This has got to be an FAQ, but I just read about 100 subject lines
> and didn't find it. I am trying to hook up a DTMF decoder (SSI202)
> and a voice synthesizer (amplified with an LM386) to a telephone line.
> The DTMF decoder works fine so long as I don't hook up the amp.
> I tried putting an amp before the decoder, but that doesn't seem
> to work either.
> Here's my current set-up:
> 
> ----Cap--- 600:600 ohm matching transformer-> amp -> ssi-202
>                                            <- Amp -< voice synth.
> 
> Any help?
> Jeff



You need to use an op-amp as a duplexor so the speech
does not interfere with the DTMF signalling. Something
similar to:
               
                speech >--|\
         ---              | -----to DTMF recognizer
Tip-----|   |-------------|/
        |   |
Ring----|   |-Ground
         ---
        600ohm 1:1 IsoXformer

/Mike
Newsgroups: sci.electronics
From: gene@aee.aee.com (Gene Kochanowsky)
Subject: Where can I get public domain SPICE for Sun?
Summary: If anyone knows where to get a public domain SPICE for Sun, Please tell.
Keywords: SPICE, Sun
Organization: Associated Electronic Engineers
Distribution: sci
Date: Mon, 5 Oct 1992 14:02:39 GMT

	I am looking for a public domain copyof SPICE for the Sun. It would be
great if it had a GUI, but that is not required.

Thanks

Gene Kochanowsky
gene@aee.com

-- 
Gene Kochanowsky                           | "And remember ....
Associated Electronic Engineers, Inc.      |       The better you look ... 
(904)893-6741 Voice, (904)893-2758 Fax     |       the more you will see."
gene@aee.com                               |               Miss Lidia
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Newsgroups: sci.electronics
Subject: Re: Multimeters
Date: 29 Sep 92 15:14:00 GMT
Article-I.D.: rover.29SEP199209141356
Reply-To: frank@rover.uchicago.edu
Distribution: na
Organization: Joint Center for Radiation Therapy
News-Software: VAX/VMS VNEWS 1.41

In article <29SEP199208160627@rover.uchicago.edu>, frank@rover.uchicago.edu writes...
>	That same fluke is subject to LDC screen failure after moderate drops,
>	(waist high to floor.) Twice already in about 6 years.

	Let me make a correction to my last posting, (the order just went
	across my desk.)

	Fluke now wants $100 to replace a bad LDC display.

   Frank R. Borger - Physicist    __       Internet:  Frank@rover.uchicago.edu
Michael Reese - Univ. of Chicago |___      Phone : 312-791-8075 fax : 567-7455
  Center for Radiation Therapy   | |_) _   No man is good enough to govern 
                                   | \|_)  another man without that other's
    "Birthplace of Softball"          |_)  consent. - Abraham Lincoln
Newsgroups: sci.electronics,rec.photo
From: fontana@dogwood.cis.ohio-state.edu (Mark Fontana)
Subject: Triggering multiple flashes to "paint with light"
Followup-To: sci.electronics
Organization: The Ohio State University Dept. of Computer and Info. Science
Distribution: usa
Date: Tue, 6 Oct 1992 15:11:25 GMT



A friend and I have some ideas for photographs using the "painting with
light" technique.  In short, this involves taking a completely dark
room full of interesting objects, opening the shutter, and popping a
flash multiple times from various angles.  The hard part here is not to
catch your own image or shadow in the picture.

Well, I have an idea.  A friend of mine works in a photo lab and grabbed
the guts of a dozen of those throwaway cameras with built-in flash.
So I now have 12 identical little flash circuits, each running on its
own AA battery.

What I'd like to do is position these tiny flashes all around the room,
then fire the first flash manually.  The other flash circuits would detect
this main flash and delay for a preset interval before firing.  That is,
the first flash would fire 1 sec after the main flash, the second would
fire 2 seconds after the main flash, etc.

I'm looking for advice on how to wire these up.  I figure I can
just use an RC circuit on each one to get the desired delay.  The two
main problems are:

     1) detecting the main flash, which may be very faint, depending
        on the placement of each auxilliary unit.  If anyone can think
        of an easier way using sound, say from a cap gun or something,
        I'm open to suggestions.

     2) discharging the flash capacitor (200uF?) without frying
        components left and right.  Are there SCR's that can handle this
        directly, or should I plan on using little relays?


Any help would be appreciated.  Schematics or references to related articles
would be terrific.


Thanks,

Mark Fontana

From: carmijo@hpnmdla.sr.hp.com (Chris Armijo)
Date: Mon, 5 Oct 1992 19:54:20 GMT
Subject: Re: 25 ohm coax cable
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics

In sci.electronics, dhina@dxcern.cern.ch (Mourad Dhina) writes:

    Hello,
    i am trying to realize a circuit i found in an electronics magazine.
    one of the components it uses is a semi-rigid coax cable of
    25 ohms impedance. this is the first time i hear of this (i only
    knew 50, 75 and 93 ohms cables, which are standard). anybody
    knows where to find this?
    Mourad

This is probably a misprint -- I suspect the "2" should have been
a "7". 

Chris
Newsgroups: sci.electronics
From: medin@catbyte.NoSubdomain.NoDomain (Dave Medin)
Subject: Re: Television Antennas and Grounding
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Date: Wed, 30 Sep 1992 19:20:19 GMT

In article <1992Sep30.140917.25806@col.hp.com>, cab@col.hp.com (Chris Best) writes:
|> rubin@skiing.cis.ohio-state.edu (Daniel Rubin) writes:
|> > I recently installed a rooftop television antenna.  I grounded the mask as
|> > was recommended in the instruction and I got to thinking.  Why is it a good
|> > idea to ground the antenna?  I would think that this would invite lighting
|> > to stike the mask!  I mean the mask is definitely the tallest point with the
|> > lowest resistance.  Wouldn't this be inviting trouble.  I would think a
|> > lightining strike would fry the grounding wire which is next to the house.
|> > This seems like a fire hazard not to mention the jolt to the TV tuner etc...
|> > Wouldn't you want to deter lighting instead of providing a ideal path for it?
|> 
|> ----------
|> 
|> Lightning rods are grounded, too, but it isn't to attract lightning.  It's
|> to dissipate any localized charge thay may build up, forcing it back to
|> the same potential as the whole area.  This deters lightning, or at least
|> lowers the chances of a hit to the same as any other point nearby.

This disagrees with several articles I've read on the subject (most recently
IEEE Spectrum and a ways back, National Geographic). The purpose of
grounding is mainly to SHUNT energy in event of a hit, and in the case
of a lightning rod, to present a more attactive TARGET due to its higher
tip charge potential than the surrounding low-conductivity area if
a hit is inevitable.

Keep in mind for the several microamperes of current before the strike,
the rod would not need to be well-grounded (the leakage current through
the structure, TV, etc., would suffice) at all if its main purpose was to
disspell the area charge. The structure is usually just as attractive,
especially if it has sharp protrusions.

The lightning rod WILL dissipate some surface charge through corona,
but single rod systems are not considered good at this. The buildup
is dependant on cloud charge (net and density), velocity of the
cloud, etc. Single and average multi-rod systems do not show the ability
to dissipate mounting charge fast enough to prevent most strikes
(the NASA research in this area provides some interesting reading). Some
microneedle fabrics do, though, and are used in cases like oil
refineries where actual bolts present great safety risks.

One point to ponder that takes no further research. What does lightning
usually strike? High, pointed objects. What is a lightning rod? A high,
pointed object...

-- 
 --------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    Intergraph Corp.				(205) 837-1174 (h)
       M/S GD3004
  Huntsville, AL 35894 		Internet: medin@catbyte.b30.ingr.com
				UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
Newsgroups: sci.electronics
From: jak9213@tamsun.tamu.edu (John Arthur Kane)
Subject: Help with wireless mic project
Organization: Texas A&M University, College Station
Date: Tue, 29 Sep 1992 14:20:52 GMT

I am posting the following for a friend.

Please email directly to him xfmon@ttacs1.ttu.edu
===========================================================

In an attempt to learn about electroncis in my spare time, I have
begun construction of a wireless FM microphone to be used as a 
baby monitor.  I am using plans from a book titled "Build Your Own
Laser, Phaser, Ion Ray Gun And Other Working Space-Age Projects" by
Robert E. Lannini.  The list of parts necessary to complete my 
project includes:  1) a 6/35 pfd trimmer cap; 2) a 5-6 pfd 0Temp Mica
cap; and 3) an FET microphone (described as an RF supersensitive mike).
I know little or nothing about electronics, hence my begginer's project.
I can't find these part at any electronic warehouse.  I've tried
Mouser Electronics, MCM Electronics, and ALL Electronics.  Neither
has any of the specific parts called for in the recipe.  I have found
the parts at a company called "Information Unlimited," which is 
"plugged" quite often in the book I'm using.  Unfortunately, they
want $9.50 for the trimmer cap, $3.50 for the Mica cap, and $9.50 for
the mike.  These prices seem a little steep.  I would like to know:
1)  Is there any other warehouse that might carry these parts?
2)  Can I substitute these parts with something else and 
still get a decent finished product?
3)  Do I just have to bite the bullet and buy from Info. Unlimited?
 
 On a side note, can anyone recommend any other books that might have
 some cool beginner-type projects?  Thanks in advance for your help.
  
  Mark

===========================================================

-- 
 John Arthur Kane, N5SLH, Systems Analyst, Microcomputer Support and Training
 Texas A&M University, College Station, TX 77843  (409) 845-9999

 email: j-kane@tamu.edu
From: root@torinet.com (Superuser)
Newsgroups: sci.electronics
Subject: Re: wanted, PROM PRO 8 adapter
Date: 26 Sep 92 22:25:03 GMT
Organization: Torinet Systems, Inc.

Please ignore. Another Test.
From: Andrew.Mitz@mailbox.bison.mb.ca (Andrew Mitz)
Newsgroups: sci.electronics
Subject: Re: Personal recording device
Date: 25 Sep 92 07:43:38 GMT

Organization: National Institutes of Health, Bethesda

In article <Bv3swn.8rp@watserv1.uwaterloo.ca> dbowman@rainbow (Don A. Bowman) writes:
>Rod Beckwith (rodb@slugo.corp.sgi.com) wrote:
>: Hello Anybody,
>: 
>: I was down at the  Sharper Image store yesterday & saw a device that I
>: would like to know more about. I hope someone can help me.
>: 
>: The device was a personal recording device. It is the size of a large pen
>: or penlight flashlight. You can record your voice onto a chip on one of two
>: 20 second channels for playback later. I guess it is the same technology
>: used on newer answering machines. The company that manufactures these
>: things is Machina Inc. out of San Francisco.
>: 
>
>I while back (couple of years?) I say some indications in the "What's
>New" type columns of Radio-Electronics or Modern Electrons about this.
>Dallas Semiconductor had a hybrid module (like an IC, but more than one
>on a mini circuit board) which did this. They were selling for 
>about $20 if memory serves. Maybe check their product lines.
>
>--
>Don Bowman                (519) 744-6154     dbowman@zeus.uwaterloo.ca


Not exactly right.  Dallas Semiconductor sells the "Stik".  It is a surface-
mount PC board and costs over $100.  Ming electronics also sells PC boards
that do sound recording and playback, as does Eletec (sp?). Eletec also
will sell single chips.  OKI sells several sound record/playback chips
and offer a few "evaluation kits".  Toshiba has some high-end chips.
For the most part OKI and Toshiba chips are available only in surface mount
packages.  The easiest and cheapest part for playing around is the ISD1016
by Information Storage Devices (1-800-825-4473).  ISD no longer sells
in single lots, but will sell 2 parts for $28 each.  The chip has everything
from a microphone amplifier to a speaker driver.  I holds 16 seconds of
speech and has quite qood audio quality.  Call ISD for data sheets and
app notes.  Some of the ham radio journals have had project articles.
Ask around in rec.ham.radio for references or search the last year or
two of QST magazine.



-------------------------------------------------
Andrew Mitz          |    NIH Animal Center
Biomedical Engineer  |    Poolesville, MD
-------------------------------------------------

All opinions expressed are my own.

 * Origin: The Electronic Mailbox (1:348/7.0)
Newsgroups: sci.electronics
From: medin@catbyte.NoSubdomain.NoDomain (Dave Medin)
Subject: Re: 25 ohm coax cable
Keywords: coax cable
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Date: Mon, 5 Oct 1992 21:38:57 GMT

In article <1992Oct5.151512.29320@athena.cs.uga.edu>, mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
|> In article <1992Oct5.142505.23001@dxcern.cern.ch> dhina@dxcern.cern.ch (Mourad Dhina) writes:
|> >Hello,
|> >i am trying to realize a circuit i found in an electronics magazine.
|> >one of the components it uses is a semi-rigid coax cable of
|> >25 ohms impedance. this is the first time i hear of this (i only
|> >knew 50, 75 and 93 ohms cables, which are standard). anybody
|> >knows where to find this?
|> >Mourad
|> 
|> Two 50-ohm cables in parallel?
|

Or, a 50 ohm cable, terminated at each end where the signal is
being injected (as in an ethernet-type tap).

-- 
 --------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    Intergraph Corp.				(205) 837-1174 (h)
       M/S GD3004
  Huntsville, AL 35894 		Internet: medin@catbyte.b30.ingr.com
				UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
From: rwc@ius4.ius.cs.cmu.edu (Randy Casciola)
Newsgroups: sci.electronics
Subject: Re: Opening other people's Garage doors :)
Date: 5 Oct 92 11:22:53 GMT
Article-I.D.: cs.BvnBM6.G4v.2
Organization: CMU Vision and Autonomous Systems

>>A simpler way (and probably much more effective) is to try to get info from,
>>say, SEARS and have the 'opener' try out all the codes they have and then
>>start over - I don't think they have too many different codes.
>
>	My opener has a 10 dip switches for the code... 2^10 = 1024, not too
>bad. I suppose it just depends on how long it takes to transmit each combination.
>
>>Ulrich Gall, Seebrooksberg 2, W-2300 Klausdorf, Germany
>>Tel.: +49-431-790292, EMail: ulrich@galki.toppoint.de
>
>-Will

My Sears opener also has 10 switches, each having THREE positions (trinary code?).
That is,3^10 = 59049, a bit more difficult.

-Randy
Newsgroups: sci.electronics
From: david@cs.uow.edu.au (David E A Wilson)
Subject: Re: VCR rewind and tape head question
Organization: Dept of Computer Science, Wollongong University, Australia
Date: Sat, 3 Oct 1992 07:14:32 GMT

lihan@ccwf.cc.utexas.edu (Bruce G. Bostwick) writes:
>VCR's ALWAYS rewind and fast-forward with the tape retracted into the
>cassette -- the guideposts and head surfaces are highly polished and
>would be damaged very quickly if this were not done.  (Also, the
>loaded tape path is rather convoluted and friction would be
>excessive.)  Even if they did not, the tape would be rendered
>unplayable long before the heads were damaged.

I think this should be qualified. Any VCR with a real time counter rather
than a non-linear spool rev counter must pass the tape by at least one
head at all times - otherwise it would loose track of time when rw/ff
(unless it records absolute time stamps rather than counting frames).
-- 
David Wilson				(042) 21 3802 voice, (042) 21 3262 fax
Dept Comp Sci, Uni of Wollongong	david@cs.uow.edu.au
From: gallant@oasys.dt.navy.mil (Robert Gallant)
Newsgroups: sci.electronics
Subject: Which Diode?
Date: 28 Sep 92 12:12:04 GMT
Reply-To: gallant@oasys.dt.navy.mil (Robert Gallant)
Organization: David Taylor Research Center, Bethesda, MD

Hi, I am trying to find the proper diode to combine the trigger signals
from two ignition coils on my car.

This combined signal is used to trigger a new fuel injection computer
(so there will be little to no current through the diodes).

Here is a diagram:
				D1
			  ------>|----------------------------|
			  |                              D2   |---OUT
	 (+)       (-)    |       (+)       (-)       --->|---|
	 ==        ==-----|       ==        ==--------|
       ----------------   |     ----------------      |
       -              -   |     -              -      |
       -  Coil 1      -   |     -   Coil 2     -      |
       -              -   |     -              -      |
       ----------------   |     ----------------      |
			  |                           |
			 ---                         ---
			 --- Condensor 1             --- Condensor 2
			  |                           |
			  |                           |
			 GND                         GND

This is the stock setup except for the two diodes.

The voltage present at the (-) terminals should be alternating between
0 and +14.1 volts at 300 Hz maximum.

I have tried 1N4148 diodes with a 100K ohm resistor from OUT to GND.
The diodes went bad immediately.

Any help would be appreciated.

Rob
gallant@oasys.dt.navy.mil