HDTenEightyP/NetNews huggingface dataset:
From: crs@crs-sys.uucp (Chris Gregors)
Newsgroups: sci.electronics
Subject: Re: Sega Genesis Guts And Operation...
Date: Fri, 20 Nov 1992 01:55:16 GMT
Organization: Confusion Control

In article <1992Nov18.065012.6143@njitgw.njit.edu> dcg5662@hertz.njit.edu (Dave Grabowski (KxiK)) writes:
>
>  1. Exactly what is this 40-pin DIP? Too many pins for a ROM, I would
>think. That's all that was in the cartridges.

Thats exactly what it is! a 16 bit wide eprom. The carts that I've hacked
around with can be copied into a 27c1024 and run just fine. If you're really
interested, I could post what I've decoded of the cart pin-out (not quite
complete but enough to get the idea of what is possible through the cart slot.

>
>  2. How come the Electronic Arts cartridges have those yellow tabs on
>the sides? They can be taken out, and don't serve ANY purpose at all.
>
But they're sooooooo pretty and my cat likes to play with them! I wouldn't
give them up for anything! :^)
-- 
| Chris Gregors aka General Mayhem                                           |
| The secrets of the universe are very simple, I just can't figure them out! |
From: ryoung@pollux.svale.hp.com (Roderick Young)
Date: Wed, 18 Nov 1992 20:28:51 GMT
Subject: Re: Re: Linear regulator circuits?
Organization: Hewlett Packard CPCD, Sunnyvale CA
Newsgroups: sci.electronics

Output impedance of your linear regulator at a few microhms seems difficult
to achieve.  When I've done power supplies (low power), 100 MILLIohms
was an acceptable interconnect R.  So, if the output leads on your
power supply are the same as (say) the set of test leads on a voltmeter,
you can add a tenth of an ohm to your output impedance right there.
Tough to say what you can do to get down to microhms.  Maybe use gold and
special connectors.  A standard PC type connector could give you 5 milliohms
by itself - three magnitudes too large.

General tips are to keep your output leads short - lead inductance will
increase output impedance, even at 100 kHz.  Also use bypass capacitors,
of course -- tantalum and ceramic in parallel should be good enough for
100 kHz -- and put them close to your load.
From: hoven@etek.chalmers.se (Hans-Ove Frimodig)
Newsgroups: sci.electronics
Subject: Modern printers (Was: Is lead solder bad for me?)
Date: 20 Nov 92 12:49:46 GMT
Organization: Chalmers University of Technology, Gothenburg, Sweden

I can breathe in solder fumes without feeling ill but certain printers
generate something that cause me to feel very bad immediately.
Two printers that I definately have this problem with is the
NEC S60P laser printer and the IBM 6750 typewriter (uses some special
non-impact dot matrix printhead).
I can feel a little when the NEC S60P is idling but when printing I must
go out of the room and I cannot return until the printing has stopped
and the room has been ventilated.
The IBM typewriter is no problem when idling, and only a little problem
when using it manually. When I drive it from the computer to print
continously I feel bad.

The feeling I get is like a metal-taste in my mouth and some 'pressure'
in my lungs (spelling ??).

Any idea what causes this ?? Is it dangerous for me ?? For other people
that doesn't feel it ??

Hans-Ove Frimodig
hoven@cd.chalmers.se
From: schuster@panix.com (Michael Schuster)
Newsgroups: sci.electronics
Subject: Smoke Theory and Dark Suckers
Date: 18 Nov 92 00:45:32 GMT
Organization: PANIX Public Access Unix & Internet, NYC

A while back some inventive folks posted documents here on two
para-scientific theories:

-that light bulbs are really "dark suckers"

-that electronic components work on smoke, not electricity ... and when
 they die, the smoke escapes.

I mentioned these to a friend who was interested in seeing them but alas,
I can't find the original articles. Has anyone archived this stuff ...
and if so can they re-post or mail them to me?

-- 
_______________________________Mike Schuster________________________________
NY Pub. Access UNIX/Internet: schuster@panix.com | 70346.1745@CompuServe.COM
The Portal (R) System: schuster@shell.portal.com | MCI Mail,GEnie: MSCHUSTER
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Whatever happened to tunnel diodes ?
Organization: AI Programs, University of Georgia, Athens
Date: Sun, 15 Nov 1992 22:31:07 GMT

In article <3sL6TB1w165w@inqmind.bison.mb.ca> bills@inqmind.bison.mb.ca (Bill Shymanski) writes:
>I have an old General Electric "Transistor Manual - 7th Edition", which
>looks like it was published in 1964 or so.   They have quite a few
>illustrations of the use of tunnel diodes.   Whatever happened to the
>tunnel (Esaki) diode ?   

I think the main thing is that conventional transistors caught up with them
in frequency response.  In 1964, a tunnel diode was almost the only way
to make a 1-GHz oscillator.  Not any more...


-- 
:-  Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:-  Artificial Intelligence Programs       phone 706 542-0358
:-  The University of Georgia                fax 706 542-0349
:-  Athens, Georgia 30602-7415 U.S.A.     amateur radio N4TMI
Newsgroups: sci.electronics
From: barr@tramp.Colorado.EDU (BARR DOUG)
Subject: Re: Are TV's interlaced?  Why no flicker?
Organization: University of Colorado, Boulder
Distribution: na
Date: Mon, 16 Nov 1992 15:45:56 GMT

In article <1992Nov14.032849.11189@ultb.isc.rit.edu> jdc3538@ultb.isc.rit.edu (J.D. Cronin) writes:
>
>Why don't ordinary TV sets flicker?  A friend told me that standard
>NTSC video signals are interlaced.  That doesn't make sense, since
>the picture should flicker enough to be unwatchable.  
>
>Any ideas on what's going on here?
>
>Jim
NTSC color television is the standard for North America, Japan and a few 
other countries. 30 frames (or pictures) are recieved a second. However,
these frames are displayed by using 2:1 interlacing - 2 scans for each 
complete frame. The first scan illuminates the odd rows, the 2nd scan
illuminates the even rows. This reduces flicker. By the way, interlacing
in computer displays with computer graphic images can introduce strange
and unwanted interference patterns.
From: rxy5310@hertz.njit.edu (Rolan Yang  Wasteland Engineer)
Newsgroups: sci.electronics
Subject: Re: Soundblaster voicemail help needed
Keywords: Voice mail
Date: 19 Nov 92 06:57:28 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.

One more thing.  Do not wire the soundblaster directly to
the phone line (before the phone). It will blow out your card/computer
the first time the phone rings.
From: mpark@stein.u.washington.edu (Michael Park)
Newsgroups: sci.electronics
Subject: Is there such a thing as...
Date: 23 Nov 92 07:56:02 GMT
Article-I.D.: u.1992Nov23.075602.8573
Organization: University of Washington, Seattle

I had this crazy idea that needs a whole bunch of light-
sensitive elements lined up in a small space (like several
hundred in about a centimeter, very approximately).  Is
there such a thing, and how fast can it be sampled?  It
occured to me that faxes and scanners might contain such
a device... maybe?  All help deeply appreciated!

--m
Newsgroups: sci.electronics
From: ray@ole.cdac.com (Ray Berry)
Subject: Re: DreamLight Construction Ideas (was Re: 'DreamLight' wanted!)
Organization: Cascade Design Automation
Date: Mon, 23 Nov 1992 02:33:18 GMT

norlin@midway.ecn.uoknor.edu (Norman Lin) writes:

>stansbury-travis@yale.edu (Travis Stansbury) writes:

>I believe (does anyone know?) that the DreamLight detects REMs via
>a physical sensor mounted on the eyelids during sleep.  If you close
>your eyes and hold your finger lightly against your closed eyelid,
>you'll feel when you move your eye around, since your cornea protrudes
>a bit from the rest of the eyeball.  A sensitive switch or pad of
>some sort could detect this.

>My question:  what sort of a sensor would be delicate enough to detect
>the slight bulge of the cornea moving around beneath the closed eyelid,
>without causing uncomfortable pressure on the eye?

	(disclaimer: I don't know how the "Dreamlight" works).  
    Rather than sense the physical movement, how about a simple EMG monitor
that picks up muscle activity around the eye socket?  This should suffice as
an REM detector.  
    Another idea I had based on readings in dream physiology would be to
monitor the standard deviation of the respiratory rate.  This would be 
cheaper.  Don't how about how the accuracy would compare.
-- 
Ray Berry kb7ht ray@ole.cdac.com 73407.3152@compuserve.com /*inquire within*/
Xref: sparky sci.electronics:19325 rec.audio:15501
From: rcamama@ccwf.cc.utexas.edu (Robert Camama)
Newsgroups: sci.electronics
Subject: IRF511 FREQ range? & Re: circuit simulation
Date: 22 Nov 92 23:49:25 GMT
Organization: The University of Texas at Austin, Austin TX

In article <1e98p9INNp6m@uwm.edu> ballen@convex.csd.uwm.edu (Bruce Allen) writes:
>I'd like to do computer simulation of some fairly
>simple audio-frequency circuits made of passive
>components, diodes, transistors, and op-amps.
[....]
>This system should run on a SparcStation (Sun-4)
>although if I need a Mac or PC I could probably find
>one.
>
>Could someone please recommend a public-domain program
>that does this?  If not, could you recommend an inexpensive
>commercial package?

	I would also appreciate word on such software for the above 
systems.  You can reply via

		rcamama@ccwf.cc.utexas.edu

ALSO:  Could someone inform me on the frequency range that the IRF511 HEXFET
	can be used over in an amplifier application?  You can reply to that 
	above address.

Thanx in advance,
R. Camama
From: jon@vector0.SAC.CA.US  (Dazed N. Confused)
Newsgroups: sci.electronics
Subject: Re: Big Brother Radio Shack
Date: Sun, 15 Nov 92 14:08:17 PST
Organization: Vector Zero


> In article <BxBzJK.BqK@news.udel.edu> bew@brahms.udel.edu (Ben Williams) writ
> 
>    I've just read this thread containing 50+ complaints about Radio Shack.
>    What I would like to know is:  Why do we have to shop at RS to get
>    electronic supplies?


     Let's have a list of good mail-order companies.  I know several
people around here have experience with many different companies
(actually--wasn't there a list a looong time ago?)

     I've only tried DigiKey and I've been happy.  25$ minimum order.
1-800-DIGI-KEY.

--Jon

   jon@vector0.SAC.CA.US                     Life is like a kiwi.
   citrus.SAC.CA.US!vector0!jon
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: HELP.   VCR trouble
Date: Mon, 23 Nov 92 15:13:23 GMT
Reply-To: paula@nlbbs.UUCP
Distribution: world
Organization: The Electronics Workbench

        I'll reply in greater detail by Email.

        Yes, heads go bad but

                           It's very rare.
              It usually doesn't happen "all of a sudden"

        As in any other electronic gizmo, any part along the line can
        fail.  First picture tubes and now Video heads seem to develop
        this "legend" of things that always go bad.

        In 10 years of servicing TVs, I found and replaced 2 pix tubes.

        In a long period of servicing over 1000 rental VCRs for a chain,
        I may have replaced 4 or 5 heads.

        My point here is know your service shop well.  Other popular
        electronic legends -

         "The microprocessor is bad" - If the unit comes on and performs
         some of it's functions, the microprocessor may be just fine.
         Usually when it goes, nothing works.

        "It's probably a cable problem" - Alas, the other day I found my
        father sitting in front of his accidentally-unplugged TV
        complaining that something was wrong with the CABLE!

And, just for fun, my favorite customer line when bringing something in
for repair -

        "There can't be too much wrong with it - it worked ok
        yesterday."

        * * * * * * * * * * * * * *  * * * * * * * * * * * * * * *
	*   Paula Stockholm              paula@nlbbs.UUCP        *
	*  Cumberland, Maine          !nlbbs!paula@uunet.uu.net  *
	* * *  * * * * * * * * * * * * * * * * * * * * * * * * * * 
        
Newsgroups: sci.electronics
From: romano@pimac2.iet.unipi.it (Romano Giannetti)
Subject: SPICE model for BC109C
Keywords: SPICE, BC109C
Organization: Dipartimento di Informatica, Universita' di Pisa
Date: Wed, 18 Nov 1992 18:22:23 GMT

Is there anybode out there who has a SPICE model for a BC109C BJT transistor?
If you do have it, please e-mail it to me and to ferrovia@pimac2.iet.unipi.it.

                                                  Thanks everybody,
							      Romano.


-- 
***************************************************************************
* Romano Giannetti          * Dip.to di Ingegneria dell'Informazione      *
*                           * Elettronica, Informatica e Telecomunicazioni*
* romano@iet.unipi.it       * via Diotisalvi,2                            *
* giannetti@sssup1.sssup.it * Universita' di Pisa, I-56126 PISA, Italy    *
***************************************************************************
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Modern printers (Was: Is lead solder bad for me?)
Organization: Motorola Computer Group, Tempe, Az.
Date: Sat, 21 Nov 1992 12:44:20 GMT

In article <1992Nov20.124946.17126@etek.chalmers.se> hoven@etek.chalmers.se (Hans-Ove Frimodig) writes:
>I can breathe in solder fumes without feeling ill but certain printers
>generate something that cause me to feel very bad immediately.
>Two printers that I definately have this problem with is the
>NEC S60P laser printer and the IBM 6750 typewriter (uses some special
>non-impact dot matrix printhead).
>

WOW! I thought I was the only one and everyone here thought I was nuts!

I can not be within 15' of my NEC Silentwriter 2-90 Postscript laser
while it's printing. I've been told to proplem is ozone created by
the corona wire in the printer. There is a charcoal filter which is
supposed to absorb it but apparantly NEC has problem in this area.

>The feeling I get is like a metal-taste in my mouth and some 'pressure'
>in my lungs (spelling ??).

Plus, if I say around, burning eyes and a pounding headache.

I attached a clothes dryer style flexible exhaust hose and a muffin
fan to mine and ducted it outside and the problems went away.


John
-- 
| ONE LINE NOVEL: She backed away from the corpse slowly, not so much out  |
| of fear, but simply unsure of what the crowd expected her to do with it. |
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
From: mmpjh@angelo.amd.com (Javed Hussain)
Newsgroups: sci.electronics
Subject: Cross-reference of a Transistor
Date: 16 Nov 92 22:15:59 GMT
Organization: Advanced Micro Devices, Santa Clara, CA

Hello!	

I need to know the full part number of a transistor. The unit has the 
following markings on it:

			8050
			1 k c
			E B C

It looks like a bipolar transistor, but I could not find a cross-reference
for this. It is on a board which is made in Taiwan.

Any help will be appriciated.

Javed    mmpjh@amd.com
From: jfw@ksr.com (John F. Woods)
Newsgroups: sci.electronics
Subject: Re: Possible to upgrade PC from FCC Class B to A?
Date: 17 Nov 92 16:51:05 GMT
Article-I.D.: ksr.18864

mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
>I think B is actually the better of the two classes (i.e., class B is
>suitable for residential use, Class A isn't).  So don't downgrade it
>from class B to class A!
>You can do lots of things to reduce emissions; visit any Radio Shack for
>ideas.  But if you mean you want the FCC to certify the computer as 
>another class, that would be very expensive.
>As I understand it, it's not illegal to _use_ an office-grade computer
>in a residential setting, it's just illegal to _sell_ it as suitable for
>such use.

Correct, however, if the FCC responds to an interference complaint from a
neighbor and tracks it down to your PC, they can (and will) tell you never,
ever to turn it on again, and they have the authority to enforce it.
Newsgroups: sci.electronics
From: neal@cmptrc.lonestar.org (Neal Howard)
Subject: Re: Is lead solder bad for me?
Date: Tue, 17 Nov 1992 23:55:49 GMT
Organization: CompuTrac Inc., Richardson TX

In article <1992Nov17.175550.14583@netcom.com> kehoe@netcom.com (Thomas David Kehoe) writes:
>Will I get lead poisoning from breathing the smoke
>from solder?  I work next to an open window, and leave
>the soldering iron on the window sill, but when I'm
>doing close soldering work, I can't avoid breathing
>the smoke form the solder.
>
>I've switched to lead-free solder, which is 97% tin and
>3% silver (available at Radio Shack).  The label still
>says to avoid breathing the smoke.  Why doesn't everyone
>use th

Long term exposure to lead fumes from doing close soldering work is
most definitely bad for you. My father's health is showing the effects
of chronic exposure since as an electronics technician, he was exposed to
lead vapors almost every day for 35 years. His last physical showed an
abnormally high lead content in his blood. I grew up in his electronics
shop and since age 5 (I am now 31) and have done *a lot* of close soldering
myself. I'm sure that my health has also been damaged. I find it quite 
ironic that both my father and myself, being the techno-geeks we are, were
completely oblivious to the hazards of heavy metal poisoning by something
that seems so innocent like soldering. BTW tin is also a toxic heavy metal
and will poison you just as much as lead. If you really want to protect
yourself from the metal vapors, do all your soldering under a vent hood.

-- 
=============================================================================
Neal Howard   '91 XLH-1200      DoD #686      CompuTrac, Inc (Richardson, TX)
         "Let us learn to dream, gentlemen, and then perhaps
          we shall learn the truth." -- August Kekule' (1890)
=============================================================================
From: josephc@cco.caltech.edu (Joseph Chiu)
Newsgroups: sci.electronics
Subject: HELP!  Identifying RAM chip
Date: 16 Nov 1992 18:19:46 GMT
Organization: California Institute of Technology, Pasadena
NNTP-Posting-Host: punisher.caltech.edu

I just wnet to Fry's Electronics in L.A. and noticed that they were selling
"VRAMS" 64K*4 for .39 each ($0.39 - yes).  They were labeled on the shelf
as "4464 VRAMS", and were in ZIP packaging.

When I took it home, it was labeled 41C464, which according to one of my
memories' data book, is just an average DRAM.

Can anyone confirm this?

(BTW, at $0.39 a piece, I'm not particularly bothered that they aren't
 VRAM's, but I want to make sure because I'm designing a mini-video
 controller, and I can use either, but I need to know which.)

-- 
Joseph Chiu, Dept. of Computer Science, Caltech.    josephc@coil.caltech.edu
1-57 California Institute of Technology, Pasadena, CA 91126. +1 818 449 5457 
*    Now running OS/2, Windows, DOS, and UNIX (okay, well, maybe not...)   *
Newsgroups: sci.electronics,sci.physics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: RFD: sci.solid-state.electronics
Originator: sehari@class1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Mon, 16 Nov 1992 20:20:57 GMT

---

In <27492@oasys.dt.navy.mil> webb@oasys.dt.navy.mil (John S. Webb) writes:

>< What about this:
><sci.electronics..quantum_physics.solid_states

><what do you guys think?
><                         Babak   Sehari

>This name -and even the first suggested name "sci.solid-state.electronics"
>have a lot of characters.  The menu in my newsreader only displays 23
>characters per name.

>sci.semicon  or sci.electronics.semi   might be good.

>John Webb    CD,NSWC
>David Taylor Model Basin
>Code 1523
>Bethesda,Md 20084
>(301)227-1870                  -no sig yet-


Well, we can not wast too much time on this; what about:

sci.electronics.micro-elec

This should do it. Frankly, who cares about the name?!

                     With highest regards,
                          Babak   Sehari.

-- 

-- 
Lines: 19
Date: Fri, 20 Nov 92 10:15:17 MST
From: haymoree@bones (Edward Haymore)
Subject: Re: TI video DAC sources?
Newsgroups: sci.electronics
Organization: Brigham Young University, Provo UT USA
X-Newsreader: Tin 1.1 PL4

myers@hpfcso.FC.HP.COM (Bob Myers) writes:
: > Any suggestions on where I can find a TI TLC5602 video DAC?
: > 
: 
: Sure.  How about Texas Instruments?
: 
: No, seriously - look in the back of any T.I. data book, and you should be
: able to find a list of distributors and worldwide T.I. sales offices.  Locate
: the one nearest you, and ask them!

I tried that -- they just referred me to electronics suppliers in my area.
The ones that I called didn't have the chip in stock and couldn't help.
A far cry from the royal treatment I get from Motorola.

Oh, well -- I modified my design so that it doesn't need the part anymore.

--
Ed Haymore
ed_haymore@byu.edu
Newsgroups: sci.electronics
From: jhwhit01@ulkyvx.louisville.edu
Subject: Re: HELP!  Identifying RAM chip
Date: Mon, 16 Nov 1992 19:21:47 GMT
Organization: University of Louisville

In article <1e8oo2INNsed@gap.caltech.edu>, josephc@cco.caltech.edu (Joseph Chiu) writes:
> I just wnet to Fry's Electronics in L.A. and noticed that they were selling
> "VRAMS" 64K*4 for .39 each ($0.39 - yes).  They were labeled on the shelf
> as "4464 VRAMS", and were in ZIP packaging.
> 
> When I took it home, it was labeled 41C464, which according to one of my
> memories' data book, is just an average DRAM.
> 
> Can anyone confirm this?
  
It appears to be a regular DRAM to me.  If it has only 18 pins, it is DRAM.  If
it has 24 pins, it is a real Video RAM.  
 
Jeff White      jhwhit01@ulkyvax.louisville.edu
Xref: sparky sci.electronics:19060 rec.audio:15256 rec.audio.pro:2357
From: shawn@panix.com (Shawn Herzinger)
Newsgroups: sci.electronics,rec.audio,rec.audio.pro
Subject: Info on Digital Audio Corp. MicroDAC needed
Summary: Need contact info on this company
Keywords: Digital Audio Corporation, MicroDAC
Date: 17 Nov 92 20:31:04 GMT
Organization: PANIX Public Access Unix, NYC

Hello all,

I need contact information for the above company. They 
manufacture an item called the Micro DAC which is an
Automatic noise filter utilizing DSP. Some details:

Up to 1024th order adaptive filter
Hiss and rumble filters
80 dB dynamic range
12 volt and AC powered
tracking adaptive digital filter
removes hum, room noises, acoustic resonances, spectral distortion
 channel interference, telephone line effects, music, etc.

I would like the manufacturers address and tel.  Any assistance
will be appreciated.

Please e-mail to shawn@panix.com

thanks.

-- 
Shawn M. Herzinger
shawn@panix.com
Newsgroups: sci.electronics