HDTenEightyP/NetNews huggingface dataset:
From: tony@daops6.scg.hac.com (Tony Wong)
Newsgroups: sci.electronics
Subject: Junction to Case Thermal Resistance Database
Keywords: Theta-jc, Thermal Resistance
Date: 26 Jan 93 21:04:56 GMT
Reply-To: ktwong@igate1.hac.com (Anthony Wong)
Organization: Hughes Aircraft Co., Tucson, AZ


Greetings,

I am in search of databases with junction to case thermal resistance
values (Theta-jc) for both common and exotic electronic components 
currently in use.  I am interested in values for a variety of packages,
including DIPs, circular can packages (the TO-X series), MPAKs, QPAKs,
LCCs, etc.

Please email me at ktwong@igate1.hac.com if you have any or can suggest
where to look for these databases.

Thank You
Anthony Wong

-- 
---------------------------------------------------------------------------
Anthony K.T. Wong, Hughes Missile Systems Company, ktwong@igate1.hac.com  |  
---------------------------------------------------------------------------
(Opinions expressed are mine, not my employers')
From: pmcdermo@cs.utexas.edu (Peter F. McDermott)
Newsgroups: sci.electronics
Subject: Need info on video cam. viewfinders
Date: 25 Jan 1993 20:56:21 -0600
Organization: CS Dept, University of Texas at Austin
NNTP-Posting-Host: earth.cs.utexas.edu
Keywords: Matsushita, Virtual Reality, Head Mounted Display

  Hello everyone!  I'm working (slowly working anyway) on building a Head
Mounted Display (HMD) for messing around with some virtual reality.  I 
have worked out some plans for a circut to split the VGA signals created
by my computer to get a brightness output and the horizontal and vertical
outputs to each one of these two viewfinders I bought at an Electronics 
shop.  Basically the red goes to one eye, the green to another, copy the
syncs.  Anyway, the problem I am having is that I have no idea what the 
pin connections are on the view finders I bought (hey, for $4 a pop, ya
can't go wrong).  These are somewhat standard looking panasonic video
camera viewfinders with the lenses, plastic case, little B/W tv and a 
circut board.  The only thing I have to go by is the serial number on the
circut board.  It has the little Matsushita symbol all over it and the 
following numbers:
  VRYD150J5B (on the front and back)
  GCMK-20X   (on the back)
There are two green connectors coming off of the circut board.  One
has three wires and the other has 9 wires.
There's also a metal box (some sort of shielding I suppose) that has 
the following number on it:
  X-C0079S and then 62 03101 below it.

Any help with this would be GREATLY appreciated.  Oh, how many scan lines?

						Peter McDermott
						pmcdermo@cs.utexas.edu

-- 
-----------------------------
If it ain't broke, break it.
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: Re: Manufacturer name wanted
Keywords: VN10KM
Date: 26 Jan 93 16:17:28 GMT
Reply-To: michael@vk2bea.UUCP (Michael G. Katzmann)
Organization: Broadcast Sports Technology, Crofton. Maryland.


In article <1993Jan25.085003.23680@htsa.aha.nl> you write:
>Hello,
>I am looking for the manufacturer of the power mosfet VN10KM,
>On the casing the symbol is a H but i don't think it's a harris transistor
>could someone give me a pointer to the manufacturer.
>
	Its a Siliconix N-channel Enhancement mode MOSFET.

V(br) 60V,  rds(on) 5 ohms, Id 170 ma  Package T0-206AC

1 source  (near tab)
2 gate	  (middle)
3 drain

Vgs 15/-0.3 V (has internal gate-source zenner)
Pulsed drain current  1A

Siliconix:  2201 Laurelwood Road,
	    Santa Clara, CA 95054-1516
	    (408) 988-8000  (fax 408-727-5414)

Netherlands Rep: Koning en Hartman
                 Elektrontechniek BV
                 P.O. Box 125
                 NL-2600 AC Delft
		 Tel: 015-609906
                 Fax: 015-619194

Ask for the "Low Power Discretes Data Book"


-- 
Michael Katzmann                  >   Broadcast Sports Technology Inc.
~~~~~~~~~~~~~~~~	         <    Crofton, Maryland. U.S.A
Amateur Radio Stations:           >     
NV3Z / VK2BEA / G4NYV / AAR3VK   <    opel!vk2bea!michael@uunet.uu.net
Newsgroups: sci.electronics,rec.music.misc,rec.audio
From: thomasd@tps.COM (Thomas W. Day)
Subject: Re: 150 - 200 W. Amplifier
Organization: Telectronics Pacing Systems
Date: Wed, 27 Jan 1993 17:28:20 GMT

In article <1993Jan26.144230.2613@uhura.neoucom.edu> wtm@uhura.neoucom.edu (Bill Mayhew) writes:
>I agree that, in general, an expensive HiFi system sounds better
>than a cheap system.  Cost and exotic components, however, do not
>necessarily have a causal relationship with pleasing sound
>reproduciton.

>The control/preamplifier in my stereo at home is a Fujitech A-102
>....
>analytically correct.  There were no substantive differences in
>so-called sound stage and other stereo buff type terminologies.
>..
>The biggest problem is that there is not very much high quality
>source material available.  Most commercially available recordigns
>are bad enough that they don't sound much better on a multi
>kilobuck stereo than a cheap boombox.

I assume you are talking about "pop" music recordings.  I think there are 
plenty of jazz (generally not fusion or new age, but standard acoustic jazz) 
and classical recordings that meet your listening criteria, though.  One of 
the things I've noticed as my audio equipment pile has grown is that my 
listening collection is shrinking.  I'm not sure I like this relationship.  
I know it means I'm getting more sophisticated in my old age, but it also 
means I'm getting more narrow in perspective.  

>The biggest problem I've seen in cheap sound equipment is woefully
>lousy power supplies.  Plenty of improvement can be had without
>resorting fancy polyproylene dielectric capacitors, but with
>properly sized transformers and capacitors.  Active regulation does
>wonders.

I assume you mean in preamplification.  Regulation in the early stages of a 
power amp would also apply, but, in the output stage, you can throw out a 
lot of overhead with regulation.  Seems like a serious sacrifice.

I really enjoyed reading this thoughtful post.  Thanks for contributing.

Tom Day
From: pguello@uwsuper.edu (Paul Guello)
Newsgroups: sci.electronics
Subject: re: Elektor
Date: 28 Jan 1993 14:45:30 GMT
Organization: University of Wisconsin - Superior, Wisconsin
NNTP-Posting-Host: 137.81.10.122

'Elektor' magazine was being published in the U.S. by Audio Amateur 
Publishing up until last November when they decided to stop.  They offered 
every subscriber a choice of different magazines.  I chose to get half as 
many issues of 'Elector' from England.  I have not received an issue yet, 
though.  Back issues are available from Old Colony Sound Lab, PO Box 243, 
Peterborough, NH 03458-0243  (603)924-9464
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: More HeNe tubes for sell...
Date: 22 Jan 93 09:50:25 CST
Organization: University of Kansas Academic Computing Services

I just recieved several more HeNe tubes. These are the bare tubes and are rated
at 1mW to 2mW maximum output. They require a 75K ohm/3 watt ballast resistor
and a power supply which produces +1800vdc at 3.5 to 5mA and a 8kvdc trigger.
They measure about 9"L x 1"D. I am selling them for $20 each plus $5 shipping.
I also have a 5mW HeNe tube for sale. It requires a 75K ohm/3 watt ballast and
a power of +2400vdc at 6mA and a 10kv trigger. It measures 13"L x 1.5"D. I am
selling it for $50 plus $5 shipping.

-=-= Wes =-=- 
Newsgroups: sci.electronics
From: u009@csx.cciw.ca (G. Stewart Beal)
Subject: Re: vortrax
Organization: Canada Centre for Inland Waters
Date: Wed, 27 Jan 1993 14:07:58 GMT

In article <26JAN199323390377@gemini> kez224@gemini (Never send a monster to do to work of an evil scientist.) writes:
>Remember the Vortrax SC-01 speech chip? I need some, I found one in an old
>project. Where can I buy more?
>Also, Does anyone have a data sheet on this thing?
>Ken
>
Can't email back to you.
There was an article in Byte: Ciarcia's Circuit Cellar Sept 1981 pg 38:
"Build an Unlimited Vocabulary Speech Synthesizer". It has pinouts,
programming info etc., although not a spec sheet. If it's not
satisfactory, or you can't get the article, I'll fax you one. I also have
lots of app note stuff left over from another project, but faxing it all
would be a costly item. If you're interested, correspond by Email and
we'll set something up.
I think some of the chip merchants in the back of Byte or Computer Shopper
might still have them, although they are REALLY OLD technology and you
might want to investigate some of the other chips (National, TI, Siemens,
or Signetics).
 
Regards, Stu Beal, VE3MWM, U009@CSX.CCIW.CA,
National Water Research Institute, Burlington, Ontario, Canada.
 
"We'd made it through yet another nuclear winter and
 the lawn had just trapped and eaten it's first robin." - Kyle J. Spiller
From: bote@access.digex.com (John Boteler)
Newsgroups: sci.electronics
Subject: Re: caller id block
Date: 28 Jan 1993 18:25:38 -0500
Organization: Express Access Public Access UNIX, Greenbelt, Maryland USA
NNTP-Posting-Host: access.digex.com

mdk@col.hp.com (Mark Keisling) writes:
>mike@CEB.McMaster.CA (Mike Anderson) writes:
>> CALLER-ID BASED ANSWERING MACHINE
>> It should be cheap to build a device based on caller id that serves as an
>> answering machine of sorts.  When it was activated it would pick up after the
>> 3rd ring or so and play a fixed message out of ROM "your party cannot come
>> to the phone at the moment, your number has been noted so that your call can be
>> returned at a later time, bood-bye.",  It would then store the number and time
>> for later recall on an lcd display. 
>
>Again, be aware that not everyone has a choice to provide a number. 

Better yet, I have already designed and now use a PC-based
voice mail system that gives a custom greeting if it recognizes 
the caller's number.

Upon playback, it announces the custom name that I have recorded
for that number before it plays back the message. Otherwise,
it just annunciates the number. Great for finding out who keeps
hanging up without leaving a message! :)

-- 
bote@access.digex.com (John Boteler) 
This week's usenet malapropism: foo, foo-foo
foo=general meaningless expletive, not deleted
foo-foo=the kind of sweet drinks they serve at Armand Chicago Pizzaria
Newsgroups: sci.electronics
From: swanee@megadata.mega.oz.au (Geoff Swan)
Subject: Re: How to build a cheap, reliable comm link?
Organization: Megadata P/L, North Ryde, Sydney, Aust.
Date: Sun, 24 Jan 1993 21:47:44 GMT

In article <pell.727566512@isy>, pell@isy.liu.se (P{r Emanuelsson) writes:
> Hi. I am currently looking at building a uni-directional 100 kbit/s link
> for long distances (cable). I will probably FSK modulate a 100 MHz carrier

Why use 100MHz as a carrier for a 100kHz signal? Why not use a 300kHz
carrier (and use less expensive cable). Have you looked at using QAM
rather than FSK? The faster (fax etc) modems use QAM to squeeze 9600bps
out of a 3kHz link. If cable is a major cost consideration here then
this may be worth looking into. As smoeone has already mentioned, TAXI
chips do a good job of high speed serial conversion but you will still
need to modulate your serial output for transmission.

    Sla/n go fo/ill,
                    Risky B.
--------------------------------------------------------------------------
Geoff Swan (research & development)   _--_|\         swanee@megadata.oz.au
Megadata Pty Ltd                     /      \ 
2/37 Waterloo Rd, North Ryde,        \_.--._/               +61 2 805 0899
NSW 2113, Australia.                       v          (Fax) +61 2 887 4847

> Dept. of Electrical Engineering	                         pell@isy.liu.se
> University of Linkoping, Sweden	                    ...!uunet!isy.liu.se!pell


Newsgroups: sci.electronics
From: eric@kilo.mks.com (Eric Gisin)
Subject: Re: 110V -> 220/240Vconversion for appliances
Followup-To: sci.electronics
Organization: Mortice Kern Systems Inc., Waterloo, Ontario, CANADA
Date: Fri, 22 Jan 1993 21:50:58 GMT

In article <7263@m1.cs.man.ac.uk> apm@kaa.ee.umist.ac.uk (Paul Marriott) writes:

   I am shortly moving to Canada and have quite a bit of UK electrical
   equipment to take. Obviously, this is rated at 240V, 50Hz. Whats the
   deal with transformers to convert 110->240? What sort of power ratings
   are available? Enough to power a 3KW kettle? Or is it better to buy
   stuff over there that is rated at 110V?

   Also, is it possible to wire two outlets in series to get 220V? Or is
   that asking for trouble!?

---

You can install 15A, 230-240V receptacles and meet the Canadian electric code.
You can run a circuit to the distribution panel,
or (not to code) connect to the split 120-120V
receptacles that all recently wired kitchen counters have.

However, if you plug in any non-CSA approved appliances into any outlet,
and they cause a fire, your insurance will not pay any claims.

3KW kitchen appliances must be wonderful. We don't have anything
in north america over 1750 watts, and they all are much lower power than
an electric or gas range.
From: dam@dcs.glasgow.ac.uk (David Morning)
Newsgroups: sci.electronics
Subject: Re: Tube Amplifier Design Questions
Date: 22 Jan 93 17:21:19 GMT
Organization: Glasgow University Computing Science Dept.

lan_lada@rcvie.co.at (Marino Ladavac) writes:



>Hi. I find this thread very interesting, since I'm trying to build a (small)
>tube amplifier myself. But, the US type tubes are generally unavailable
>(or very expensive) in Europe. Does anyone know where can some info be
>found on ECC 83, ECC 82, EL 84, and EL 34 - what are the US equivalents?

ECC83 is a 12AX7
ECC82 is a 12AT7(?)
EL84 is a 6BQ5
EL34 is a 6CA7

Dave
--
From: afong@sdcc13.ucsd.edu (Krell Kraver)
Newsgroups: sci.electronics
Subject: Auto "tow" sensor idea needed
Date: 24 Jan 93 20:37:33 GMT
Organization: University of California, San Diego


 
I need help designing a "tow" sensor to add on to my existing car
alarm.
 
The car currently has a shock sensor, but towing the car would not
necessarily set it off... it reacts mostly to higher frequencies,
like the car body getting hit.
 
I can't use an ordinary tilt sensor either, since if I park on a
hill, it won't work!
 
Anybody have any bright ideas?  I was thinking of something that
would kind of react to a change in tilt.  Maybe something that would 
automatically level out when I parked on a hill, but would trigger
at the faster lifting of the vehicle by a tow truck.
 
Or maybe there's a better way of detecting a towing attempt?
 
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Voltage drop across 1N4148 diode?
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Thu, 21 Jan 93 10:12:00 GMT



The voltage drop across the 1N4148 diode depends on what type of
semiconductor material it is made of.  If the diode is made of
germanium (no, not the flowers) the drop is around 0.7V; if it
is made of silicon then the drop is around 0.5V.

The 1N4148 is usually used in computer applications and most
general purpose circuit board applications where small currents
are used.  I agree that the 1N4001 would be a better diode for
this particular application.


Jerry


"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues
From: rubin@cis.ohio-state.edu (Daniel J Rubin)
Newsgroups: sci.electronics
Subject: Re: Need to find a source for small enclosures
Date: 21 Jan 1993 11:42:52 -0500
Organization: The Ohio State University Dept. of Computer and Info. Science
NNTP-Posting-Host: skiing.cis.ohio-state.edu

> Im manufacuring a small device in small numbers and I decided to use
>a project case from Radio Shack. I belive 270-221. Its roughly 4.25*2.25
>*1inch I believe. I dont have the catalog handy. Theyare not too expensive
>and since I could not find a mail order replacement that was as inexpensive
>and as customed to those dimensions I decided to stick with Radio shack
>even they they cost $2.48 a piece with tax. My biggest problem is dealing with
>them. Its alot of trouble to get the quantites I need and I only need 15.

Did you try DigiKey?  Their number is 1-800-DIGIKEY I think.  If you need
anything that Radio Shack has DigiKey almost always has it also at a much 
better price.  Also try Mouser electronics, I do not have their number handy
but you can call 800 directory service at 1-800-555-1212 and they shoud have
it.  Also try surplus dealers like All Electronics and Electronics Goldmine.

								- Dan
-- 

             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!
Newsgroups: sci.electronics
From: gw214790@LANCE.ColoState.Edu (Galen Watts)
Subject: Re: Recommendations for Digital Multimeter
Date: Wed, 27 Jan 1993 21:33:20 GMT
Distribution: usa
Organization: Colorado Concert Sound

In article <thomasd.38.728156827@tps.COM> thomasd@tps.COM (Thomas W. Day) writes:
>In article <15657.2b645387@ohstpy.mps.ohio-state.edu> garland@ohstpy.mps.ohio-state.edu writes:
>>In article <C1FqqK.2vt@taligent.com>, kayshav_dattatri@taligent.com (
>Kayshav Dattatri) writes:>> I want to buy a digital multimeter for my hobby 
>set. I have seen models>> from Philips, Funa etc. I'm willing to spend 
>about $100.>> 
>>> Can the gurus recommend a good model and source to get it cheap (mail order or
>>> in the SFO bay area market).
>>I recommend the Beckman series of DMM's. There are several in the $100 price
>>range. I've found them to be very rugged, and they have large LCD displays with
>>good contrast -- better than the Fluke line in that regard.  Also, a point
>>frequently overlooked, is that they have extremely long battery life -- about
>>x10 longer than the Fluke's, and they're also well-shielded against rf.
>
>I've used both, Beckman and Fluke.  I like both, but personally own a Fluke 
>8060A for the features.  The battery life on my Fluke has been satisfactory, 
>more than a year per 9V.  I can't complain about the LCD contrast.  I use it 
>in audio applications, often where the ambient light is marginal, and it is 
>always readable.  Fluke's customer service is amazing.  My 8060A was damaged 
>in shipping two years ago.  Really battered.  Fluke repaired it and got it 
>back to me in 3 days.  And the cost of repair was extremely reasonable.

I've also had Beckmans and Flukes, and I think the differences are trivial.
Meters with a big rotary switch will need to have the switch cleaned at some
point, and I've never seen a digital meter that didn't have some problems
with RF.  I personally own a Fluke 8020A, and I have a Fluke 87, a Beckman
DM25L and a Simpson analog at work.  The Fluke is nice with the averaging,
the Beckman with the transistor gain and the Simpson for seeing small
fluctuations that a digital meter misses.

I'd buy something really cheap from Radio Shark until you really know what
you need.

Always open to suggestions,
Galen Watts, KF0YJ
Newsgroups: sci.electronics
From: asv@gaboon.UUCP (Stan Voket)
Subject: Re: WEFAX/PRESS PHOTOS
Organization: Voket Org.
Date: Tue, 26 Jan 1993 14:10:50 GMT

In article <1993Jan25.164830.24822@ryn.mro4.dec.com> klimasewski@fccvde.enet.dec.com (My name is...) writes:
>
>This will interest those that have a Satellite Dish (TVRO)
>
>Over the weekend I was successful in copying wefax pictures (S3 ch17 @1.88 and 
>1.93MHz) and Press Photos on K2.
>
>The demodulator and software is made by SOFTWARE SYSTEMS 
>CONSULTING, called WEFAX/GOES. It consists of a piece of hardware that 
>connects to the end of an RS232 cable. The hardware has two cables with 1/8th
>plugs. One for HF fax and the other for VHF. This plugs into the ext. speaker
>jack.
>
>I connected the descrambler output port of my receiver which is a 0-8MHz video
>output port to the rf input port of a shortwave receiver that has an 
>FM mode and tuned in the freq range of 1.88MHz,1.93MHz (S3) and 4.020MHz (K2). 
>
>Pictures looked great! Has anyone else tried this using a TVRO??
>
>
>                             Ken


Ken,

Please tell us more.

Where to contact SSC.
How much did it cost?
How do you display hte images?
What format are they in?
etc., etc., ...

Thanks,

Stan

-- 
+----------------------------------------------------------------------+
| -  Stan Voket, asv@gaboon  - OR -  ...uunet!hsi!a3bee2!gaboon!asv  - |
|       -   Voice: (203) 746-4489 - FAX 746-9761 TELEX 4996516  -      |
+----------------------------------------------------------------------+
From: garyg@warren.mentorg.com (Gary Gendel)
Newsgroups: sci.electronics
Subject: Re: Auto "tow" sensor idea needed
Date: 26 Jan 1993 14:09:45 GMT
Organization: Mentor Graphics Corp. -- IC Group
Distribution: world
Reply-To: garyg@warren.mentorg.com
NNTP-Posting-Host: garyg.warren.mentorg.com

I had a shock sensor that worked really well in this respect.  It was years ago
so it may be unavailable.  This sensor was sold by Universal Products, and looked
like a long rectangular tube (with rounded edges).  It had an adjustment that I
used to make it very sensitive.  I did not have any problems with hills as I
mounted it perpendicular to the axis of the car (of course you would have problems
if the road had a steep sideways grade).

BTW, these shock sensors have one big detriment.  After the neighborhood kids
discovered it, they were constantly setting it off for fun.

Gary



Xref: sparky sci.electronics:23559 rec.audio:19624 rec.audio.car:5903 rec.audio.pro:2886
From: jraup@coral.bucknell.edu (Raup II James R)
Newsgroups: sci.electronics
Subject: Re: hard disk orientation
Date: 26 Jan 1993 12:57:46 -0500
Organization: Bucknell University, Lewisburg, PA, USA
NNTP-Posting-Host: coral.bucknell.edu

In article <C1GHnF.DGL@dcs.ed.ac.uk> gst@dcs.ed.ac.uk (George Taylor) writes:
>Could anyone tell me if running a hard disk vertically instead of horizontally
>(e.g.using a desktop machine on it's side like a 'tower' system)
>is likely to decrease it's lifetime?
>
>-- 
>George

 I'd check the manufacturer's specs. The manual I got with my Seagate(tm)
(157n SCSI) states that any orientation is acceptable EXCEPT Circuit
board up (Daughterboard up). I'm not sure if this is applicable to other
manufacturers, though. This is an older drive (3 1/2 yrs), but new
enough to have auto-park (heads) on power-down..

hope this helps

-Jack
From: sergei@upenn5.hep.upenn.edu (Sergei Borodin)
Newsgroups: sci.electronics
Subject: Re: Where do I get a Maxim Max 232 CPE chip?
Date: 22 Jan 93 17:24:56 GMT
Organization: University of Pennsylvania

In article <1993Jan22.114641.24921@mr.med.ge.com> szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983) writes:

[ the question where to get ONE Maxim chip deleted ]

>Try your local Hallmark (no, not the card people), Hamilton-Avnet or Newark Distributors.
>They should be listed on your local Buisness Yellow Pages.  I would try Hallmark first,
>I've gotten MAXIM products through them before.

 Always the hard way? To those who don't know.
 Maxim generously sends FREE samples if you 
 call 1-800-998-8800.

>Jerry

 S.B.


Newsgroups: sci.electronics