HDTenEightyP/NetNews huggingface dataset:
Organization: The Pennylvania State University
Date: Thu, 17 Dec 1992 09:47:05 EST
From: Ernie Oporto <EAO102@psuvm.psu.edu>
Newsgroups: sci.electronics
Subject: Re: "The Glob" Atari 2600 processors ???

In article <kennehra.724560313@craft.camp.clarkson.edu>,
kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) says:
>
>Hi.  I opened up one of my atari 2600 games, and instead of a regular
>chip inside, there was this small plastic glob where the ROM chip
>should be!!!!   what is this?  It was black and looked like a big
>bump of solder.  How is this possible for a black glob of plastic
>with no pins to be able to store information?  The black glob was like
>melted into the center of the PC board...and the game worked perfectly
>when I put it back together again.  Any help figuring out this mystery
>would be greatly appreciated!!

Heh...I believe that's some wax, or something like that,
covering the processor.  I opened up a really cheap
calculator to catch a glimpse at its insides, and it was
how you described it...a plastic glob.  Guess they don't
want you fidlling with their processor, but I think they
also have that there to tell if you voided your warranty
by pulling the glob off to get at the processor yourself.
---
"Hey you, YAK!  Where's your tag?" - Ren
  _____)           ______        _)       _)  EAO102@PSUVM.PSU.EDU
                               __       __    OPORTO@CORVETTE.ECE.PSU.EDU
______    ______            ___      ___      Ernie "SHOKK" Oporto
                               __       __    Computer Lab Attendant
(_______ _      _ ________ _     _) _     _)  for PSU's CAC Department
From: mpaul@unlinfo.unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: More on possible PADS problems...
Date: 11 Dec 1992 21:31:51 GMT
Organization: University of Nebraska--Lincoln	
Distribution: global
NNTP-Posting-Host: unlinfo.unl.edu

Forgot to mention something else that can seem like a problem with
running PADS: use their batch files to run the software, since those
batch files do a lot of stuff.  PCBS.BAT fires up the PCB package
and LOGICS.BAT gets the schematics going.

--
paul marxhausen .... ....... ............. ............ ............ .......... 
 .. . .  . . . university of nebraska - lincoln .  . . .. . .  .. . . . . . . .
 .     .    .  .   .     .   .  .    .   .  .   .    .   .  grace .   .    .  . 
   .         .       .      .        .        .      .        .   happens .     
Newsgroups: sci.electronics
From: markm@ee.ubc.ca (mark milligan)
Subject: Re: Flywheel batteries as EV power source
Organization: University of BC, Electrical Engineering
Date: Thu, 17 Dec 1992 17:47:04 GMT

Wouldnt the gyroscopic forces of a 600 Lb flywheel spinning
at several thousand or 10's of thousands rpm cause problems
manuvering the vehicle?  

I know that the propeller of a small plane causes the aircraft 
to turn and must be trimed with an opposing force. 

Maybe this is the reason flywheels are not such a good idea? 
Newsgroups: sci.electronics
From: strong@tc.fluke.COM (Norm Strong)
Subject: Tek 545 instruction manual
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Date: Wed, 16 Dec 1992 16:45:32 GMT

Someone recently posted a request for a Tektronix 545A instruction
manual.  If that person has not yet found one, I have one for you that I
accidentally uncovered.  e-mail me.
-- 

Norm Strong  (strong@tc.fluke.com)
2528 31st S.   Seattle WA 98144   USA
Newsgroups: sci.electronics
From: acampane@magnus.acs.ohio-state.edu (Angelo Campanella)
Subject: Re: Tube Audio Amp Kits/Info Wanted
Organization: The Ohio State University
Distribution: sci
Date: Sun, 13 Dec 1992 08:13:47 GMT


If you can find a copy of the RCA vacuun tube handbook vintage the '50's, they 
always had a half-dozen circuit diagrams for audio stuff.
From: yee@edison.seas.ucla.edu (John Yee)
Newsgroups: sci.electronics
Subject: Re: Blue LED manufacturer
Date: 21 Dec 92 02:25:47 GMT
Organization: SEASnet, University of California, Los Angeles

About Blue LEDs, there is an entry in the Digikey (1-800-344-4539) catalog
for such devices made by CREE, 470nm peak wavelength, $2.80/each, 4 different
ones 16, 29,32,42 degrees, T-1, T-1 3/4 clear and diffused. 1.5 - 13 mcd.
-- 
jy, yee@seas.ucla.edu 
Newsgroups: sci.electronics
From: Bob Zigon <bobz@truevision.com>
Subject: Need details of Caller ID
X-Useragent: Nuntius v1.1
Date: Fri, 11 Dec 1992 21:27:58 GMT
Organization: Truevision, Inc

   How does caller id work? If anyone has a pseudo detailed description,
I would
appreciate seeing it?

Bob Zigon
From: ryoung@pollux.svale.hp.com (Roderick Young)
Date: Thu, 17 Dec 1992 23:54:22 GMT
Subject: Re: Query: What are pseudo-static RAMS?
Organization: Hewlett Packard CPCD, Sunnyvale CA
Newsgroups: sci.electronics

Psedostatic RAMs are not truly static, because (in some cases), they can
be "busy" refreshing while you want to access data.  Also, they tend to
be slower than true static RAM.

As for power, they do pretty well, but I wouldn't expect one to retain
data at 2V and a few microamps.

If you're building your own project, and access time is not an issue, then
PS RAM might be a convenient way to go (saves a DRAM controller).  However,
for commercial applications, there's only a narrow range of uses that justifies
the PS price (vs. dynamic).
Newsgroups: sci.electronics
From: jeroen@dxcern.cern.ch (Jeroen Belleman)
Subject: Re: Toroid 60Hz power transformer source?
Organization: CERN European Laboratory for Particle Physics
Date: Thu, 17 Dec 1992 16:00:10 GMT

In article <1992Dec17.093200.20954@dk.oracle.com> mberg@dk.oracle.com (PUT YOUR NAME HERE) writes:
>
>I used to think so, but after building an amplifier using two 500 VA toroid
>transformers I am not so sure anymore.
>I had several problems with radiated EM fields - one of these resulting in
>a 7-9 A (!) current though the chassis.
>Kind regards
>Martin Berg

Ah! I bet I know what happened to you! You most probably had BOTH ends of
the bolt which goes through the centre of the transformer grounded.
I presume you mounted it in between two plates or in a metal box, with
a nice big bolt through the middle.
That's a single turn short-circuit. Not good!

Best regards,
Jeroen Belleman
jeroen@dxcern.cern.ch
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: How full is a nicad
Date: Wed, 16 Dec 1992 18:21:37 GMT
Organization: U of Toronto Zoology

In article <1992Dec15.103954.6299@quando.quantum.de> henigan@quando.quantum.de (Kevin Henigan) writes:
>I believe you can tell how full a nicad is from it's Voltage...

No, you can't.  This is one of the fun problems of building a NiCd charger.
The output-voltage curve of a NiCd is essentially flat from pretty nearly
full charge to pretty nearly empty.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
From: vnelson@ccu.umanitoba.ca (Gerald Vernon Nelson)
Newsgroups: sci.electronics
Subject: Re: Voltage regulators in parallel?
Date: 21 Dec 92 03:44:07 GMT
Organization: University of Manitoba, Winnipeg, Canada

In <9212170609.AA07808@gaak.LCS.MIT.EDU> jpexg@gaak.LCS.MIT.EDU (John Purbrick) writes:


>I want to set up a power supply delivering more current than an integrated
>voltage regulator (LM78xx if fixed, or LM317 if variable) will provide. It

>John Purbrick
>jpexg@lcs.mit.edu

hy don't you use a pass transistor to boost the current.
Any decent data book on the 78xx series will have 
a picture of this circuit.

Vern Nelson
Xref: sparky sci.electronics:20979 sci.energy:6200 rec.autos.tech:16813
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 17:32:34 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <BzE2oz.I4H@ns1.nodak.edu> csmith@plains.NoDak.edu (Carl Smith) writes:

|I am not going to argue the above point, but consider this.  If you are
|going to measure danger by the amount of stored energy, then which is
|more dangerous when it explodes?  A flywheel that has enough energy to 
|move a car 100 miles at freeway speeds, or a tank of gasoline with enough 
|energy to move a car at greater-than-highway speeds for 300 miles?

|>Unless you wrap the flywheel in a massive enough container that it can absorb
|>all that energy without vaporizing, you're going to have an explosion.

|Why bother, we don't wrap our gas tanks in a container that would contain
|their explosion?

Except that under rare circumstances, gas tanks don't explode, they burn.

|The point I am trying to make is that flywheels may be dangerous, but driving
|around with 20 gallons of gasoline strapped to the bottom of your car in a
|thin sheet metal container is A LOT MORE dangerous.  But we consider that 
|risk as acceptable considering the convenience that we get from our cars.
|So, why the worry about deriving the same convenience from a lesser danger?
|Because people are not used to doing it every day...

I disagree that the gas tank is a lot more dangerous.  In most accidents
the gas never catches fire.  If the tank does rupture it usually just
leaks all over the place.  If it does catch fire, as long as the tank
has already been ruptured it will just burn.  All of the chemical energy
is released over minutes or hours.

Now if the flywheel fails, all of the energy will be dumped in a matter
of milliseconds.  While there may be more energy in the gas tank, the
time compression makes the effects of the flywheel failure much more
dramatic.
-- 
Mob rule doesn't become any prettier, just because the mob start to call itself
a government.
It ain't charity if you are using someone else's money.
Mark.Wilson@AtlantaGA.NCR.com
Xref: sparky sci.electronics:21104 sci.energy:6246 rec.autos.tech:16880
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 18 Dec 92 15:30:57 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <olsen.32.724613003@vetmed.cvm.uiuc.edu> olsen@vetmed.cvm.uiuc.edu (Aart_Olsen) writes:

|In article <BzEsw7.57B@cs.uiuc.edu> morrison@cs.uiuc.edu (Vance Morrison) writes:

|>1) Slow down the rate of energy dumping. ...

|This is what laboratory ultracentrifuges do.  Usually the rotor housing
|is contained in a thick bronze casing which "slowly" absorbs the kinetic 
|energy.  I once heard an ultracentrifuge blow, and it sounded like a freight
|train for maybe five minutes.  Lab centrifuges contain a surprising
|amount of energy--even though they have relatively small rotors and big 
|motors they take quite a while to get up to speed because so much has to 
|be pumped into them. 

Do you happen to know how much one of the little beasties weighs.

-- 
Mob rule doesn't become any prettier, just because the mob start to call itself
a government.
It ain't charity if you are using someone else's money.
Mark.Wilson@AtlantaGA.NCR.com
Newsgroups: sci.electronics
From: iqbal@kaw.eel.ufl.edu (M.Iqbal)
Subject: Re: PADS Shareware Installation
Organization: University of Florida
Date: Tue, 15 Dec 92 22:21:57 GMT

In article <of_csQK00iUy83m1h4@andrew.cmu.edu>, jmce+@andrew.cmu.edu (James Ryan Miller) writes:
|> 
|>     I've got a number of requests for the info on how to get PADS to
|> install, so here it is.  Any problems with this, just let me know.
|> 
|>                                         Ryan Miller
|>                                         jmce+@andrew.cmu.edu
|> 
|> ------
|> PADS logic and PADS pcb manual installation
|> 
|>         Many people have had trouble running the install program for
|> these programs.  Then you must install the programs manually as follows:
|> 
|> 1)      You need these files:           PADSPCB.ZIP
|>                                         PADSLOG.ZIP
|>                                         PADSLIB.ZIP
|> 
|>         make the directory:             /PADSDEMO
|> 
|>         unzip PADSLOG.ZIP into the \PADSDEMO directory, and copy the
|> file files.exe to logfiles.exe.  Then unzip the other two into
|> \PADSDEMO.
|> 
|> 2)      Make the following directories: /PADSDEMO/LOGFIL
|>                                         /PADSDEMO/FILES
|>                                         /PADSDEMO/LIB
|>                                         /PADSDEMO/CAM
|> 
|> 3)      Move the following files:
|>         \PADSDEMO\LIB.EXE       ->      \PADSDEMO\LIB\LIB.EXE
|>         \PADSDEMO\ULIB.EXE      ->      \PADSDEMO\LIB\ULIB.EXE
|>         \PADSDEMO\FILES.EXE     ->      \PADSDEMO\FILES\FILES.EXE
|>         \PADSDEMO\LOGFIL.EXE    ->      \PADSDEMO\LOGFIL\LOGFIL.EXE
|> 
|> 4)      Execute the following files (they are self extracting):
|>                 \PADSDEMO\PADS.EXE
|>                 \PADSDEMO\DHLP.EXE
|>                 \PADSDEMO\LOGIC.EXE
|>                 \PADSDEMO\LIB\LIB.EXE
|>                 \PADSDEMO\LIB\ULIB.EXE
|>                 \PADSDEMO\FILES\FILES.EXE
|>                 \PADSDEMO\LOGFIL\LOGFIL.EXE
|> 
|> 5)      Okay, the program installation is done.  You must do hardware
|> setup still.  Goto the \PADSDEMO directory and run pinstall.
|> 
|>         That should be it.  I hope this helps.  Let me know if you have
|> any problems.
|> 
|>                                                 Ryan Miller
|>                                                 jmce+@andrew.cmu.edu

Why one need to do all this when everything is self extracting?
-- 

---------------------------------------------------------------------------
"If your annual income today is $50,000, you have the same buying power as
the average coal miner did in 1949, adjusted for taxes and inflation," John
Sestina, nationally recognized Certified Financial Planner;  quoted in 1987.
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---
From: sysrick@orion.spd.louisville.edu (Rick McTeague)
Newsgroups: sci.electronics
Subject: Re: "The Glob" Atari 2600 processors ???
Date: 17 Dec 92 17:23:20 GMT
Organization: University of Louisville

In <kennehra.724560313@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:

>Hi.  I opened up one of my atari 2600 games, and instead of a regular
>chip inside, there was this small plastic glob where the ROM chip    
>should be!!!!   what is this?  It was black and looked like a big
>bump of solder.  How is this possible for a black glob of plastic
>with no pins to be able to store information?  The black glob was like
>melted into the center of the PC board...and the game worked perfectly
>when I put it back together again.  Any help figuring out this mystery
>would be greatly appreciated!! 

If it's a small glob .25 - .5 inches around, it's a drop of epoxy-like
potting compound to protect an integrated circuit "die" which is mounted
directly to the circuit board. The chip is mounted that way (instead of
in the traditional DIP package) because it saves space, and may be less
expensive for mass production. Many small calculators - and I would guess
all digital watches - are made this way.

The black blob protects the IC and its lead wires, which are otherwise 
very fragile. Try and pry off the potting compond, and you'll ruin the 
chip.

If it's a large glob - large enough to hold a DIP packaged chip within it -
then it's probably there to keep you from messing with the ROM.
-- 

Rick McTeague
Electrical Engineering Department, Speed Scientific School
University of Louisville, Louisville, KY 40292
(502) 588-7020

Internet: sysrick@starbase.spd.louisville.edu

Disclaimer: I'm a stand-up comedian; if anyone takes me seriously, I'm
            doing something wrong!
From: d89-ahg@ludd.luth.se (Anders Hedberg)
Newsgroups: sci.electronics
Subject: Programs for microchips PIC controller ?
Summary: looking for them ...
Date: 16 Dec 92 15:47:11 GMT
Organization: Lule} Tekniska H|gskolas Datorf|rening - Ludd

I'm looking for these programs :
	PICSIM (version > v2.20)
	PICALC (version > v3.01)

and of course some nice source code for the PIC 16C5x.
(or other related programs ... )

Since the Microchip EBBS is far,far away from Sweden I'd love to here about
a ftp site that carries the same programs ?!?

(Just mended my PICPRO programer, the two 74HC245 could not be replaced
with 74LS245, but today I got the HC version! )



-- 
/Anders Hedberg             d89-ahg@ludd.luth.se                  Lulea, Sweden
Newsgroups: sci.electronics
From: philb@techbook.com (Phil Biehl)
Subject: Need source for large (>30,000 uF) caps.
Organization: TECHbooks of Beaverton Oregon - Public Access Unix
Date: Tue, 15 Dec 1992 22:18:59 GMT

I'd like to increase the size of the filter caps for my Hafler DH-220
power amp to 30,000 uF or greater. Working Volts at 75V is sufficient.
If anyone knows where I can get these babies fairly cheaply please drop
me a line.

Thanks much,

Phil Biehl
Home Row, Inc.


philb@techbook.COM  Public Access User --- Not affiliated with TECHbooks
Public Access UNIX and Internet at (503) 220-0636 (1200/2400, N81) 
-- 
philb@techbook.COM  Public Access User --- Not affiliated with TECHbooks
Public Access UNIX and Internet at (503) 220-0636 (1200/2400, N81) 
Xref: sparky sci.electronics:21016 sci.energy:6215 rec.autos.tech:16835
From: frank@marvin.contex.com (Frank Perdicaro)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 20:54:22 GMT
Followup-To: sci.electronics
Organization: Xyvision Design Systems

In article <1goebdINNik@gap.caltech.edu> carl@SOL1.GPS.CALTECH.EDU writes:
>In article <1992Dec16.192456.6261@news.cs.brandeis.edu>, andyh@chaos.cs.brandeis.edu (Andrew J. Huang) writes:
>=In article <1992Dec15.194558.2556@adobe.com> pngai@adobe.com (Phil Ngai) writes:
>
>Unless you wrap the flywheel in a massive enough container that it can absorb
>all that energy without vaporizing, you're going to have an explosion.

This guy is correct.

As an interesting side light, the largest forging ever made is 
the largest flywheel ever that stores energy at MIT for the 
ALCATORC-MOD fusion reactor.  It takes like 500 hp all night to spin it up, 
and 3 seconds to stop when the switch is flipped.  

Yeah, megajoules, many of them.  If there was a quake when the thing
was spinning, it would remove a large section of Cambridge.  

Its surface speed is just below the speed of sound, and it weighs like
a very large steam locomotive ; and its right next to the FISSION
reactor..... they know there is no way to stop it if there is a quake,
so its just in a simple flimsy building.

-- 
	 Frank E Perdicaro, Systems Admin, etc.		Xyvision Color Systems
      Legalize guns, drugs and cash...today.		101 Edgewater Drive
   inhouse: frank@marvin, x5572				Wakefield MA
outhouse: frank@contex.com, 617-245-4100x5572		018801285
Newsgroups: sci.electronics
Newsgroups: sci.electronics

> I purchased a 486 motherboard fitted with a 486DX2 50MHz cpu. Unfortunately
> with no extra cooling the system fails to complete its bootup proceedure.
> The board is fitted with 33.3MHz crystal that can be replaced presumably

> to operate however on contacting the supplier he claimed that the crystal
> frequency didnt matter so long as it is high enough and reckons i need a
> 50 or 80 Mhz xtal which he is posting to me. Is this assumption correct?

Your supplier seems to be uninformed.  You are absolutely right -- get a
25 MHz crystal.  I assume that you mean a crystal can oscillator, and not
just a crystal.  If someone designed their own oscillator, say, with
transistors, then it's possible that the oscillator is tuned to some strange
harmonic, then divided down.

Disclaimer: I don't speak for my company.

- Roderick; HP Personal Computer Division
From: davea@hpscit.sc.hp.com (Dave Angelini)
Date: Wed, 16 Dec 1992 17:31:29 GMT
Subject: Re: Making decals on plastic
Organization: Hewlett-Packard, Santa Clara, CA
Newsgroups: sci.electronics

   Could these ideas be used to make 4 inch vinyl lettering for putting
the name of a boat on fiberglass? How?


Newsgroups: sci.electronics,rec.audio,alt.guitar,rec.music.makers.guitar
From: strohm@mksol.dseg.ti.com (john r strohm)
Subject: Re: Tube amp transformers
Keywords: tubes transformers
Organization: Texas Instruments, Inc
Date: Mon, 14 Dec 1992 21:22:49 GMT

Nathan Stewart was worried about frying his multimeter while working around
tube circuits with typical 350V - 500V plate supplies.

Not to worry, guy.  PROVIDED THAT YOUR MULTIMETER has an appropriate voltage
range, you are not gonna draw enough current to hurt it.  The typical DVM
has an input resistance of around 10 Megohms.  The typical old-style VOM
used a 50 uA meter movement (20,000 ohms/volt) and the internal voltage
dividers were sized to allow the meter to draw that current at full-scale
voltage.  If you hit the meter with a higher voltage than the current
range, you can hurt it, which is why MODERN DVMs say OUCH when their input
protection circuits clamp.

The usual problem is that your meter draws enough current from the circuit
to throw it off.  You usually won't see this, unless you are working on something
REALLY touchy.  (I had a couple of megohms in series with a big electrolytic
capacitor a few years ago: I was trying to observe RC time constant in action.
With a 20,000 ohm/volt meter, on a 3V scale, I was effectively shunting my
capacitor with a 60K resistor.  Made a nice voltage divider.  I bought a DVM
that day, right after I realized what I was doing wrong.)
From: tgzhang@MtHolyoke.edu (Tian Ge Zhang)
Newsgroups: sci.electronics
Subject: ftp site for Macrocell in Magic
Date: 20 Dec 92 19:46:29 GMT
Organization: Mount Holyoke College
X-Newsreader: Tin 1.1 PL5





Hello, I am an undergr. student at Mount Holyoke College. I am working on
the Magic cad tool for my independent project which is to design a digital
circuit for playing Tit tak toe game, the circuit layout I came up with
uses about 72 gates. 

I wonder if anybody knows any ftp sites that provide scmos cells ready to
use, especially the Macrocells functions such as 8-3 line Encoders, 4- 16
line decoders.  My intension is to speed up the design by using the made
cells instead of drawing them myself by connecting basic gates(NAND, NOR),
that way it can save much time. Anyone have a clue about this? Thanks to
aue company which provides basic functions, but I would be happier if
there are well-made macrocells.  Thanks in advance.

--Tian  tgzhang@mhc.bitnet
888888
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: stand alone UART ??
Keywords: UART
Date: 17 Dec 92 21:35:13 GMT
Organization: Broadcast Sports Technology., Crofton, MD

Does anyone know of a current part like the old Western Digital
TR1863/1865. It is a stand alone UART, i.e. pin programmable
with separate physical recieve and transmit sections.
The 1863 appears in the 1984 Data book but WD now only make all
singing/all dancing ones that require a microprocessor to talk
to them (load registers etc).

Please e-mail me if you  know of a suitable device.
(Use address below as the reply address probably won't work 8-) )



-- 
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.audio,alt.guitar,rec.music.makers.guitar