HDTenEightyP/NetNews huggingface dataset:
From: lester@naomi.NoSubdomain.NoDomain (Les Bartel)
Subject: Microwave oven blowing fuses
Reply-To: lester@naomi.b23b.ingr.com
Organization: Dazix, An Intergraph Company
Date: Tue, 21 Jul 1992 18:56:05 GMT


I have a GE microwave oven that is blowing fuses when the high voltage
transformer is switched on by the triac when using the 'low' or 'medium'
settings.  The triac is turned on by an opto-isolator driven by the
timer board.  When the triac turns on, my ammeter shows about a 40 amp
surge (the needle moves to about half scale, I don't know how much is
needle inertia, because the triac shuts off immediatly [and it should
with that kind of load!]).  Another indication of the surge is a slight
dimming of the lights on that circuit at the same time.  When operated
on high, the oven works fine.  My question is: Is it likely to be a bad
triac, or timer board?  The oven was manufactured in 1983 and has given
me no problems at all with daily use (except for a few burned out bulbs).

 - Les

-- 
Les Bartel			lester@naomi.b23b.ingr.com
Dazix, An Intergraph Company	uunet!ingr!b23b!naomi!lester
From: JDurand@cup.portal.com (Gerald Joseph Durand)
Newsgroups: sci.electronics
Subject: Re: Help me identify this!
Date: Fri, 24 Jul 92 18:45:34 PDT
Organization: The Portal System (TM)
Distribution: world

I need some help finding a supplier and data sheets on a couple of chips
made in Taiwan.  They are:

	PT-2262		Remote Control Transmitter
	PT-2272-M4	Remote Control Receiver

These are RF remote control chips, I've seen them used in a couple of
places, but can't find the manufacturer.  I have a customer that needs
several thousand of these, so if you sell them or know who does, please
contact me.

Thanks.

Jerry Durand
Durand Interstellar, Inc.
219 Oak Wood Way
Los Gatos, CA  95032-2523
tel:  +1 408 356-3886 (day only, California time)
fax:  +1 408 356-4659
net:  jdurand@cup.portal.com

[I posted something like this a few days ago, but never saw it on the net.]
Newsgroups: sci.electronics
From: "commodore chairman" <commodore.chairman@canrem.com>
Newsgroups: sci.electronics
Subject: mazda light dimmer
Date: 27 Jul 92 03:12:54 EST
Reply-To: "commodore chairman" <commodore.chairman@canrem.com>
Distribution: sci
Organization: Canada Remote Systems


I'm fixing a light dimmer for the dashboard of a Mazda B2200 pick-up
truck, but I can't figure out what one of the parts is.

The compenent is a 10 pin package which is about 1" wide, and 1/2" tall
and has the following written on it:

YH-OSC-03
   7G3D

I asked at the local electronic store, but the person didn't know what
it was.  Could it be a customized package made for this particular
dimmer?

Alex Burger - Commodore Chairman of CRS (416-798-4713)
--
Canada Remote Systems  - Toronto, Ontario/Detroit, MI
World's Largest PCBOARD System - 416-629-7000/629-7044
From: marcusj@apricot.co.uk (Marcus Jenkins)
Newsgroups: sci.electronics
Subject: Re: Radar Detectors, and Radar Detector Detectors and TVs
Date: 27 Jul 92 08:11:28 GMT
Organization: Apricot Computers Limited

gmw1@cunixa.cc.columbia.edu (Gabe M Wiener) writes:

Apparently, if you buy *any* sort of DTI 'radio' license, this
gives them carte blanche to stroll into your house and 'inspect
your equipment'.  If you don't have a license at all, then they need
a court order.  Before they get a court order, they are most likely to
come around and ask questions, send written warnings etc. 

A court order, if 'The Bill' is to be believed, is terribly
easy to get;)
 
>You *can* detect the difference between b&w and color, but I don't know
>if they'd invest in the hardware necessary to do that.

>What are the penalties for operating a TV without a license?

400 pounds ($700 US ish), and, I believe, a criminal record.
Xref: sparky sci.electronics:13651 comp.sys.ibm.pc.hardware:20696
From: simon@ewd.dsto.gov.au (Simon Rockliff)
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
Subject: Re: Airport X-Rays
Date: 30 Jul 92 17:51:23 GMT
 <1992Jul23.115038.5296@werple.pub.uu.oz.au> <BrwMMA.6rG@news.cso.uiuc.edu>
Organization: Defence Science and Technology Organisation, Salisbury, South Australia

In article <BrwMMA.6rG@news.cso.uiuc.edu>, dvsg0223@uxa.cso.uiuc.edu (David Salamon) writes:
|> smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
|> 
|> >The X-rays themselves won't do any damage, unless you're carrying something
|> >like 1000ASA photographic film, but they use pretty hefty electromagnets
|> >to focus the beam, so I never trust floppies or tapes in them, just in case.
|> 
|> Just a physics point here, but electromagnets will not focus ANY
|> electromagnetic wave, including X-rays.  Remember superposition of fields?
|> People have been trying to focus X-rays for many years without much success.
|> Virtually all X-ray machines just use incoherent, unfocussed X-rays.
|> 
|> If there are magnets in those X-ray machines, they are most likely in the 
|> motors running the conveyer belt.
|> 
|> David
|> 
|> --------------------------------------------------------------
|> David Salamon                Physics Graduate Student (Slave

Perhaps what Steve McKinty meant by beam was a high energy electron beam which is 
used to bombard a target to produce the X-rays. Searching in the depths of my
memory I recall that my 1978 vintage Physics textbook had a picture of an
electron beam, accelerated by a high electric potential, and focussed by an array
of electromagnets onto a tungsten target, producing X-rays. However, I have no
idea if the modern X-ray machines use different methods to produce the X-rays.
						
Simon Rockliff
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: dap@portal.vpharm.com (David A. Pearlman)
Subject: Re: Two-sided CD's *DO* exist! (was Re: Life after CDs)
Organization: Vertex Pharmaceuticals, Inc.
Date: Tue, 28 Jul 1992 03:14:14 GMT

In article <27JUL199215011713@rover.uchicago.edu> frank@rover.uchicago.edu writes:
>In article <1992Jul27.182147.1332@portal.vpharm.com>, dap@portal.vpharm.com (David A. Pearlman) writes...
>>This isn't the first time Polygram has taken an offbeat road to promote
>>their artists. Around 1980, they issued a couple of promo-only samplers
>>(vinyl LP's) that played from the inside-out (more recently, Capitol took
>>the same route and issued a 12" EP by the group School of Fish that played
>>from the inside out). 
>
>	Anybody remember who the group was that came out with a 3-sided LP?
>	I remember the technology, but can't remember who did it.
>
>	Side one was normal, other side contained 2 parallel spiral tracks.
>	Depending on just where you sat the needle, you got two different
>	tunes.

As someone else already noted, that album was by Monty Python: "Matching
Tie and Handkerchief." Note that this only applied to original pressings
of the album. When Arista reissued the album in the '80's, the mysterious
"3rd side" disappeared. 

More intersting than the Monty Python album may have been a promo only
12" single issue by Polygram Records (again!) in the early '80's. Titled
"Russian Roulette," it contained several tracks from the then-current
album by the group Rush, each on a separate parallel spiral track. Depending
on where you dropped the needle, you'd hear a different song...

dap
-- 
=============================================================================
    David A. Pearlman

Vertex Pharmaceuticals Inc.                     email: dap@vpharm.com
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 24 Jul 1992 18:52:52 GMT
Subject: Re: Wave-like scan line prob on TV
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> |          |
> |          |
>  \          \
>  /          /
> |__________|
> 
> 
> (Hmmm... that's my best ASCII art in ages).
> 
> This usually means the big capacitor in the powersupply is broken.


Maybe.  My first question would be: Is the display operating near any 
other electrical device running at or near the line frequency?  (Such as
an electric motor, a disc drive, or - most commonly! - another CRT?)



Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Newsgroups: sci.electronics
From: iisakkil@vipunen.hut.fi (Mika R Iisakkila)
Subject: Re: Gerber previewers / converters (summary)
Organization: Helsinki University of Technology
	<1992Jul20.164626.8948@leela.cs.orst.edu> <7484@public.BTR.COM>
Distribution: sci
Date: 23 Jul 92 20:15:47

thad@btr.BTR.COM (Thaddeus P. Floryan) writes:

>Is that "GC-PREVUE" an executable?  For {DOS, MacOS, UNIX, ???} ?

It's an executable for DOS, and shareware.

I got a copy of it, and it's just about exactly what I was looking
for. Highly recommended. I haven't got any information about other
software, so non-DOS -users may be in trouble. The GC-PREVUE package
contains a description of the Gerber format, so it may be informative
to PC-less people too.

Thanks to all who responded!

--
Segmented Memory Helps Structure Software
From: Chris_F_Chiesa@cup.portal.com
Newsgroups: sci.electronics
Subject: Re: Caller ID]
Date: Sat, 25 Jul 92 06:59:33 PDT
Organization: The Portal System (TM)
Distribution: na
  <1992Jul20.170049.3206@krfiny.uucp>

Here in Rochester, NY (disregard the CA posting address), the closest thing 
we have to the CALL TRACE and send-the-offending-#-to-the-police feature,
is something that you PAY EXTRA for, which allows you to "tag" the "last 
phone call received," but you then have to CALL THE PHONE COMPANY at a later
time, during business hours, and tell them the date and time of the call so
they can go back and LOOK UP the "tagged" call and THEN, MAYBE do "whatever"
with it.  Sounds like we're behind the times, eh?

Chris Chiesa
  Chris_F_Chiesa@cup.portal.com
Newsgroups: sci.electronics
From: johnh@macadam.mq.edu.au (John Haddy)
Subject: Re: Coax Question
Organization: Macquarie University, School of Mathematics, Physics, Computing and Electronics
Date: Mon, 27 Jul 1992 22:12:57 GMT

In article <1992Jul27.125000.9458@cs.hw.ac.uk>, adrian@cs.hw.ac.uk (Adrian Hurt) writes:
|> In article <1992Jul22.052519.901@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
|> >In article <1992Jul20.140143.19341@yang.earlham.edu> jeremiah@yang.earlham.edu (Jeremiah Wilton) writes:
|> >>I am wondering what kind of coax is used in Ethernet thin and thick wire 
|> >>connections.  I am unconvinced that some really expensive special stuff 
|> >>is necessary.  Might not RG-58 or 59 work for thinwire?  How about 
|> >>composite video cable (the thin cheap stuff)?
|> >
|> >Thinwire Ethernet is RG-58 (52-ohm).
|> 
|> According to my catalogues, there are:
|> Uniradio M43: 50 ohms, one solid 0.9mm central conductor, braid screen.
|> RG-58C/U: 50 ohms, 19x0.18mm stranded central conductor, braid screen;
|> RG-58B/U: 50 ohms, one solid 0.8mm central conductor, braid screen;
|> Thin Ethernet: 50 ohms, 19x0.2mm stranded central conductor, braid and
|> foil screen (foil round the insulator, braid round the foil);
|> 

Although its not the recommended coax, I can vouch for RG58C/U - our network here
has over a kilometre of it installed for our Ether network. It's also a damn
sight cheaper than fully spec.'d Ethernet thinwire coax.

RG59 is no good - its characteristic impedance of 75ohms doesn't fit the
requirement for a nominal 50ohm coax.

Thick Ether coax could probably be replaced with other cable of similar
characteristic impedance and _attenuation_ (this is what's important here). The
last time I looked, however, thick Ether was cheaper than other comparable
coaxes. This is probably due to quantity in use - miles of RG58 is used for
purposes other than networks, while the use of low-loss coax of the calibre of
thick Ether is much smaller.

----------------------------------------------------------------------------

      |  _  |_   _   |_|  _   _|  _|              Electronics Department
    |_| (_) | | | |  | | (_| (_| (_| \/           School of MPCE
    ---------------------------------/-           Macquarie University
                                                  Sydney, AUSTRALIA 2109

    Email: johnh@mpce.mq.edu.au, Ph: +61 2 805 8959, Fax: +61 2 805 8983

----------------------------------------------------------------------------
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Mail dbase access? parts
Date: 25 Jul 92 00:21:26 GMT
X-Maildoor: WaflineMail 1.00r

I'm curious wouldn't it be real nice to perform part searches via
the net?

For example you could send mail to "archie" [only this wouldn't
BE archie but like archie] for a request for part types etc.  [or
help! hehehehe] and then you could get a listing of CO's that fit
your list then you could FTP/Mail these sites and request spec
info.  This would be REAL nice.

... Table scraps make Fido fat & cause bad digestion!
--- Blue Wave/QWK v2.10
                                                                  
Xref: sparky sci.electronics:13282 rec.audio:10818 alt.folklore.computers:11101
From: csmith@plains.NoDak.edu (Carl Smith)
Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
Subject: Re: Life after CDs
Date: 24 Jul 92 23:40:51 GMT
Organization: North Dakota State University, Fargo, ND

In article <1992Jul24.203724.22543@rchland.ibm.com> jsimon@rchland.vnet.ibm.com (Gerald Simon) writes:
>This may sound stupid but, when I look at the back side of a CD (the side
>the music is on), the light reflected back in the first part of the CD 
>(usually less than 1/4 inch from the outside) differs from the light reflected
>back from the rest of the CD.  I've always assumed that's the portion of the 
>CD where the music is recorded.  If that assumption is correct, than there is 
>a LOT of space left over for additional music over the rest of the CD....How 
>wrong am I?


I don't know which part you think is the recorded part and the unused part, 
but CD's are played from the center out, the opposite of records.  So the 
band around the outside edge is the unrecorded part.

I have noticed the difference in appearance, and I have also noticed that
the shorter the playing time of the CD, the bigger the band around the edge 
is.

Also, believe it or not, the recorded part has a smoother appearance than
the unrecorded part.  On most of my CD's the recorded part has a very smooth
looking surface, with a little speckly apparance, and the unused part has 
what looks like rings, or very small, close "record" grooves.  These grooves
are probabably caused by the finishing process used on the metal disk.
Maybe it is machined in a rotational fashon, making the circular lines, 
which are later removed in the recorded part by the pressing...

Anyway, my Wierd Al CD, which is about 50 minutes long, has a half inch band
of unused space around the outside, but my Guns 'n' Roses  Use Your Illusion II CD is 76 minutes long, and has an unused band less than 1/16th of an inch
around the outside edge.  So 76 seems to be near the limit, and the band
around the outside edge is the unused part...
From: thad@btr.BTR.COM (Thaddeus P. Floryan)
Newsgroups: sci.electronics
Subject: Re: SHOCKING STORIES
Date: 21 Jul 92 12:15:27 GMT
Organization: BTR Public Access UNIX, Mountain View CA

In article <7480@public.BTR.COM> grady@public.BTR.COM ( ) writes:
>Just to take this thread on a morbid twist,
>does anyone know what voltage and amperage
>is used in state executions?

Dunno, but I've "heard" that a person can be killed using a common 1-1/2V
"D" cell battery, some wire, and two needles.

No, you DON'T strangle the person with the wire, shove the battery down
his throat, and bury him under a cross made from the needles!  :-)

As it was related to me years ago, the point (no pun :-) of the needles
was to penetrate the epidermis and present the battery's voltage to the
highly-conductive "inner" layers of the person's body; if, say, one
needle pierced each arm, the current would pass through the heart causing
fibrillation leading to death.

Probably a 12V car battery and jumper cables (with one clamped to, say, the
big toe and the other to one's opposing arm) would effect the same result;
'twould probably hurt, too!  :-)

Which reminds me: I remember some 40 years ago the Rye Beach Amusement Park
in New York had a "ride" in the fun house which was a 30' or so diameter
cone whose apex was about 3' higher than the circumference: the trick was not
to be "spun off" as the wheel/cone was spun faster.  No sweat ... 'til the
ride operator starting turning on the sparks.  ZZZZ-Z-A-P, *P*O*W*.  The
shock would cause one to release one's hands and, of course, be spun off.

My recollection was the shock was imparted through bolts whose heads were
flush with the wooden surface of the "wheel/cone."  Wonder what voltage
was used?   Wonder if such "rides" still exist in amusement parks?

Hmmm, what with all the concern about falsely-triggered car alarms awakening
neighborhoods, what about having one's car charged up to some potential?

Thief attempts to break in, ZZZ-Z-A-P *P*O*W*.  Only a millisecond disturbance
to the neighbors, followed by the thief's quiet wimperings!   :-)

Hmmm, would probably need a remote-control device to disable such a system
for legitimate entry.

Thad Floryan [ thad@btr.com (OR) {decwrl, mips, fernwood}!btr!thad ]
From: davei@comp.lancs.ac.uk (Mr D Ingles)
Newsgroups: sci.electronics
Subject: Video Signal Conversion
Date: 22 Jul 92 15:15:08 GMT
Organization: Department of Computing at Lancaster University, UK.

Has anybody got circuits for converting video signals (including sync)
between different formats ? ie composite to RGB etc ? I used to have 
a collection of diagrams but have lost them since moving house.

What would be ideal would be a general purpose circuit that could handle
conversion between most signals all in one box. 

Davei (davei@lancaster.ac.uk)
From: saouter@irisa.fr (Saouter Yannick)
Newsgroups: sci.electronics
Subject: Re: 25KV (was: SHOCKING STORIES)
Date: 28 Jul 92 22:29:44 GMT
Organization: Irisa, Rennes(FR)

In article <1992Jul23.192145.1@research.ptt.nl>, walvdrk@research.ptt.nl (KEES VAN DER WAL) writes:
|> In article <1992Jul22.145523.261@bony1.bony.com>, billg@bony1.bony.com (Bill
|> Gripp) writes: 
|> 
|> > natural reaction was to grab that wire so he wouldn't fall.  Only
|> > problem was that wire provided 11kVAC to drive the electric trains.  He
|> > said his brother only survived because the path the current took through
|> > his body did not pass through his heart.
|> 
|> This morning there was a story on the BBC-news that a boy survived a 25KV shock 
|> from an overhead railway line. I didn't catch how he came into contact with the 
|> line; he's in hospital now.
|> 
|> <kees>

Voltage in itself does not mean anything: I've heard of a man having taken without
unloading it a Wimshurt engines which can produce much more voltage, in fact at least 100
kV and sometimes up to 1 MV. He did not even fall uncouncious. In the other side, I've
read that voltage of electrical chair is 7000 V.

Is there anyone here to explain all the ways of dying upon electrical shock (tetanos of
the heart, burning of the heart or brain ...) ?

saouter@sigle.irisa.fr
From: gt8021a@prism.gatech.EDU (EASON)
Newsgroups: sci.electronics
Subject: 20W Audio amplifier chip TDA1520
Summary: Anybody used this chip?
Keywords: Radio Shack, Philips
Date: 22 Jul 92 19:21:32 GMT
Distribution: usa
Organization: Georgia Institute of Technology

..
A couple of years back, I wandered into a Radio Shack at lunchtime, and they
had a closeout on these Philips TDA1520A (& TDA1520B) single-chip "20W Hi-Fi
Audio Amplifiers."  I bought a couple with the intention of building a pair
of self-amplified bookshelf speakers for my synthesizer (or whatever).  I'm
just getting around to the project (sound familiar?), and I was wondering if
anyone else had used these chips before.  Any caveats?  Is the "Test & appli-
cation circuit" correct?  Parts of it look suspicious, but my op-amps course
was too many unused years ago.

I remember that RS had a (10W?) stereo audio amp chip, but these are single-
channel.  The chip is a 9-pin SIP with dimensions around .5" x 1" x .2".
                 ___________
                | TDA1520A  |
                 )         ( 
                |___________|
	          ||||||||| 
	          ||||||||| 

"Anything you could do to help would be...  helpful."  (MP&tHG)
-- 
Bill Eason         w-404/894-2381        h-404/352-6914
BE-EE/CS May 1987    MS-EE June 1992    PhD-CS ???? 19??
wte@cdrom.gtri.gatech.edu (pref.)  -or-  gt8021a@prism.gatech.edu
From: yeap@eecs.nwu.edu (Kok-Hoo Yeap)
Newsgroups: sci.electronics
Subject: Energy transfer effiency of microwave oven
Summary: Does energy transfer depends on load ?
Date: 23 Jul 92 22:11:40 GMT
Article-I.D.: eecs.1992Jul23.221140.8403
Organization: EECS Department, Northwestern University
Originator: yeap@alg4.eecs.nwu.edu

A question about energy transfer in microwave oven:

A microwave oven with a glass of water, volumn V. 
Let Pa be the power draws from the AC outlet,
Pb be the power actually received to heat up the water.
Ef = (Pb / Pa) * 100.0 is the efficiency of energy transfer.    
   
If we plot Ef vs V, what does the curve look like ?
Does Ef depends on the volumn of water V, or is it always a constant ?

If Ef depends on what you put in the oven chamber, which
material/food has higher energy transfer efficiency and why ?
 
-- 
/  Gary (Kok-Hoo) Yeap		|   Email: yeap@eecs.nwu.edu  \
\  Department of EECS           |                             /
/  Northwestern University      |                             \
\  Evanston, IL 60208           |                             /
From: markey@flash.ATC.Olivetti.Com (Tim Markey)
Newsgroups: sci.electronics
Subject: Lever Switches
Date: 23 Jul 92 17:04:36 GMT


      Are all lever type switches momentary, in that when the lever is
      released do they go back to the original pole (if they are SPDT)?

      I opened one up and examined it.  Inside, when the lever was pressed,
      it would contact the second terminal and then go back to the first
      when the lever was not pressed.           

      TJM 
Newsgroups: sci.electronics
From: mwandel@bnr.ca (Markus Wandel)
Subject: Help!  20mA current loop spec?
Organization: Bell-Northern Research, Ottawa, Canada
Date: Mon, 27 Jul 1992 15:37:11 GMT

A friend of mine wants to interface to a video terminal using the 20mA current loop
protocol.  The terminal manual is unavailable and the interface seems thoroughly
antiquated.  Where does one find a SPEC for this thing?  We have a library here with
all the IEEE, CCITT, etc. etc. specs but we don't know where to start looking.  Can
anyone help?

Responses to "markus@pinetree.org", not to where this posting comes from (we can't
receive e-mail at work).  Posted responses work too.

Thanks in advance...

Markus Wandel
Xref: sparky sci.electronics:13261 rec.audio:10803 alt.folklore.computers:11088