HDTenEightyP/NetNews huggingface dataset:
From: vijay@netcom.com (Vijay Vaidy)
Newsgroups: sci.electronics
Subject: 150 Meg 'scopes for $400
Date: 13 Jan 93 01:44:04 GMT
Article-I.D.: netcom.1993Jan13.014404.11635
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

Hi all!

There is a source that has 4 Tektronix 454s (used but tested)
which is a 150 meg dual trace 'scope WITH the CAMERA Attachment
(basically a polaroid thiingummy to get hard copies of your
favourite waveforms) whcih they want to dump at $400 a piece.

I cant use 4, so I was wondering if net.wisdom though this was a good
price and if I could find 3 others that may be interested in this.

They can ship at your cost, they weigh 29 lbs so call UPS for
shipping costs, it'll be shipped from zipcode 94555 or close!

It'll be sold off this following Monday unless I say otherwise,
so I'd appreciate hearing from you b4 then.

I'll be out of town between Thursday and Sunday, so I'll reply
to any mail that arrivesduring that period on Sunday evening. I
would appreciate your including a phone number where I can reach
you if you are interested. I do have some specs that I can read
to you over the 'phone!

Thanks all!

- Vijay
--------
vijay@netcom.com
========
Newsgroups: sci.electronics,rec.games.programmer
From: cwatters@magnus.acs.ohio-state.edu (Coyt D Watters)
Subject: Sort of a Joke - sad though...
Organization: The Ohio State University
Distribution: na
Date: Tue, 5 Jan 1993 20:07:45 GMT

While working at a large retail store this Xmas (why?  the ca$h), I 
overheard a customer telling another sales associate that Nintendos should
not be sold, "because they kill the color from your tv, starting with the
weakest."

-Coyt (MY game machine is 32 bit, with 32 voice sound and hi res graphics,
	i.e. a PC, and I haven't killed any colors yet!)
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: miniature transponders
Date: 7 Jan 1993 20:45:09 GMT
Organization: University of Washington, Seattle
Distribution: na
NNTP-Posting-Host: carson.u.washington.edu
Keywords: Smithsonian, pooches

In article <1iaq83INNs2a@overload.lbl.gov> mikec@ux1.lbl.gov (Mike Chin) writes:
>A recent Smithsonian had an article about the usage of "rice-sized"
>transponders embedded into retail products for customer marketing info.
>Are these similiar to the devices that were being subcutaneously 
>implanted into dogs/cats for ID purposes? Who sells these things & how
>do they work?

	A maker of such devices gave a talk here at U. of Wa. some
years back: he was labeling salmon fry.  The transponder was a
piece of stamped stainless steel wire, injected into the nose
cartilage of the about-to-be-released fish.

	It was detected by some 3-d magnetic field sensors, that could
detect the presence of a magnetic dipole in a restricted region
(into which the snout of the caught fish was thrust).  The stamping
on the wire was read like a binary code, and served a second 
purpose as well: it strained the stainless steel so that the
tag could be magnetized (this was a nominally non-magnetic alloy).

	If one made the tag of the correct length, it would
resonate/reradiate at a sharply defined frequency, and this could
allow a simple piece of wire to be used as a transponder.
The embedding of such an antenna in a medium (like a book...)
would necessarily change its resonant frequency, though, in
a manner that would be difficult to characterize (changes with
humidity and paper age).  Not useful for tracking merchandise.

	Dallas Semiconductor makes some two-wire inventory tag devices,
but I don't know any transponder-type integrated circuit tags.

	John Whitmore



Newsgroups: sci.electronics
From: lnosek@ux4.cso.uiuc.edu (Luke Nosek)
Subject: Connecting multiple strobe lights
Organization: University of Illinois at Urbana
Date: Mon, 4 Jan 1993 09:07:11 GMT


	I have these three strobe lights and I want to make them flash
synchronously, with minimum interconnection. Here is the schematic -
I may have interpreted wrongly so feel free to tell me if something doesn't
make sense:

	|-------------------------------|
	|		6V	|	|
	C		|	|	L  Light
	|		R 56K	|	|
	|    150K	|	|	Gnd
	|-----R---------|	|
	|		|	|
	|		|	|
	|		|	|
	R 22K		|	|
	|		| 22K  <
	|		|--R--Q     6V
	|	       /       \    |
|-------|-------------Q		\----
|	|	       >
|	|		|
|	|		|
CdS	R 52K		Gnd
| Cell	|
|	|
|	|
|-------|
	|
	|
	Gnd

	I've tried to connect them directly - at the terminals of the
light bulb, because that is the most accessible and simplest connection,
and it works for two bulbs, but I fear trying a third will overload the
single transistor that would probably source all the current in a case
like this.

	First of all - am I right that ONE transistor will source all the
current? And second, if I am, what other way is there to interconnect these
oscilators so that they are in phase but power themselves seperately?

	I hope the schematic is clear enough - if you have any questions
about it email me and I'll update it...

							Luke Nosek
From: mikec@ux1.lbl.gov (Mike Chin)
Newsgroups: sci.electronics
Subject: miniature transponders
Date: 5 Jan 1993 02:02:43 GMT
Organization: Lawrence Berkeley Laboratory
Distribution: na
NNTP-Posting-Host: ux1.lbl.gov
Keywords: Smithsonian, pooches

A recent Smithsonian had an article about the usage of "rice-sized"
transponders embedded into retail products for customer marketing info.
Are these similiar to the devices that were being subcutaneously 
implanted into dogs/cats for ID purposes? Who sells these things & how
do they work?

mike chin
MJChin@lbl.gov
Xref: sparky sci.electronics:22038 sci.physics:22134
From: rgarito@reef.cis.ufl.edu (Robert Garito)
Newsgroups: sci.electronics,sci.physics
Subject: Re: Lasers/collimated light in RGB?
Date: 5 Jan 93 09:59:49 GMT
Followup-To: sci.electronics

jlange@radian.uucp (John Lange) writes:

>In nightclubs I have recently seen light effects which apparently
>use bright red, green, and blue lasers which are modulated with 
>mirrors (I think) to do interesting things like project color 
>images on a wall.  The red could be a simple He-Ne laser, but what 
>about the green and the blue?  I know these light sources can be 
>made with expensive 

Having many years of concert lighting experience, I can tell you that
it is unlikely that a night-club is using real lasers.  Several lighting
companies (notably Intellabeam) market devices that use incandescent
light with optics to SIMULATE laser beams.  They have a much wider
beam spread than a real laser and are usually used in confined
spaces only (like a nightclub).  Concerrts use real lasers, usually
ion lasers such as Argon.  HeNe is used to a small extent in concerts
also, but is generally shied away from.  The reason why nightclubs
USUALLY don't use real lasers is cost.  Argon (Green/Blue) can
run in the $10k-$20k range.  Plus, they usually require cooling
in the form of water (some newer ones are air-cooled, but,
that is relatively new to the entertainment world).  Also, REAL 
lasers are quite dangerous.  Most laser shows are inspected and
the operators licensed, because they can blind audience/crew members
if they hit the eye.  The average night-club doesn't want to get involved
in that area...  

I have seen some un-licensed HeNe shows (such as Peter Pan, which I
just worked on).  They used a .25mw HeNe to depict Tinkerbell.  That
power is supposedly legal in every state (according to what they told
me).  It is possible that the red is done with HeNe, but, if you
are seeing green or blue, most likely it is a simulator and the
red is also simulated.  If you happen to see WHITE, it is DEFINITELY
simulated.  WHITE lasers are QUITE expensive and VERY new.

And, yes, the beams are modulated (in both simulated and real) via
the use of mirrors (computer-controlled) and shutters.

--
Robert Garito
President, MicroLAN Technologies
rgarito@reef.cis.ufl.edu
From: rja@newbirth.Eng.Sun.COM (Robert Allen)
Newsgroups: sci.electronics
Subject: Re: Battery Gell cell or Lead
Date: 7 Jan 93 17:02:00 GMT
Organization: Sun
NNTP-Posting-Host: newbirth

In article <388.442.uupcb@ozonehole.new-orleans.la.us> gerald.belton@ozonehole.new-orleans.la.us (Gerald Belton)  writes:
>
>You definitely do NOT want to be carrying a liquid-electrolyte lead-acid
>battery around on a bicycle.  If you fall, you will have enough to worry
>about without getting battery acid on yourself and your bike.

    Uhhh, I guess I should read before running off at the
    fingers.  I fully agree that one would not want to be
    carrying a liquid lead acid battery around....
--
Robert Allen, rja@sun.com		DISCLAIMER: I said it, not my company.
		    Samuel Addams: Brewer, Patriot.															        "The right to brew beer is the right to be free!" - me
Newsgroups: sci.electronics
From: uchrgrh@Msu.oscs.montana.edu
Subject: Re: Printed Circuit generating Software?
Reply-To: uchrgrh@Msu.oscs.montana.edu
Organization: Montana State University
Date: Mon, 4 Jan 1993 15:54:51 GMT

In article <bhertz.3285@terapin.com>, bhertz@terapin.com (Ben Hertz) writes:
>        Hi everyone.  I'm a high school student who's interested in
>electronics.  I enjoy building little circuits and reading all the stuff in
>this conference that I know absolutely nothing about.  
>        After seeing some new "iron-on" sheets for making P.C. boards
>advertised in several catalogs I began considering generating my own boards. 
>What I'm looking for is a Shareware, or relatively cheap program that will
>generate patterns for me.  There is a review of such a program in the May
>edition of Computer Craft, but after reading it over I'm not so sure if it does
>what I originally thought it did.  I am hoping for a program which I tell what
>I need connected to what other things, and it spits out a pattern. Maybe that's
>too much too ask, I don't know.
>        Anyway, if someone out there knows of a shareware program that creates
>Printed Circuit patterns, or where I could get one, I'd like to hear from them.
> Thanks.
>
>P.S.  Anyone know how many people are connected to this conference?
>
>                         Ben Hertz (bhertz.terapin.com)
>                         Richmond, California
Ben,
I just recently read something on this network concerning PCB software and 
called the company, Protel technology, with great success.
Their number is 1-800-544-4186.  Just tell the person on the other end
who you are and tell them you are interested in Easytrax.  It is shareware
and really does quite a lot.  I am not well versed in it but I am pretty sure
it will at least get you started.  I would send you a copy of what they sent
me but if you call them you will get all of the information on their other
software also. 

good luck

Richard 
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: PC Game Card
Keywords: ?
Organization: AI Programs, University of Georgia, Athens
Date: Tue, 12 Jan 1993 05:22:46 GMT

In article <1993Jan11.125901.26589@progress.com> fossey@progress.COM (Paul Fossey) writes:
>I would like to use the PC Game Port on my PC to monitor outside world 
>measurments such as temperature, humidity, barometric pres. etc. Does anyone
>know how to construct resistive probes for these inputs, or where to purchase
>these devices.

A resistance that varies from 0 to 100K ohms will substitute for each of
the potentiometers in the game port.

For details see an article I wrote in PC Tech Journal back around 1985.
(No, I don't have copies for sale; I don't even have the exact reference
handy.)



-- 
:-  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 :  ** *** **
From: barryf@hpfcso.FC.HP.COM (Barry Fowler)
Date: Tue, 5 Jan 1993 21:12:39 GMT
Subject: Re: TV tuner help wanted
Organization: HP Colorado Computer Mfg. Operation
Newsgroups: sci.electronics

Yes.

try Howard Sams Schematics 1-800-428-7267.

As for what's wrong with the set, if the raster is just plain blank on
VHF only, it's probably the oscillator (transistor) as there is a common
RF amp. transistor used for both UHF and VHF.  One other remote possibility
is the "B+ voltage" provided to the VHF tuner but in about 12 years of 
repairing TVs, I've seldom seen a fault in this circuit.

When working on VHF tuners, do not move any parts or bend any leads or
it will detune the tuner, perhaps out of the range of its fine tuning.
Keep all leads on replaced components SHORT as you're working in a very
sensitive high frequency circuit.

Have fun,

barry
From: ornitz@kodak.kodak.com (Barry x24904/ER/167B-TED)
Newsgroups: sci.electronics
Subject: Re: Microwave Oven Plasma Etcher? (definitions)
Summary: Reike Diagrams and Hartree Diagrams
Keywords: microwave, Reike and Hartree diagrams, Gerling Labs
Date: 7 Jan 93 00:55:50 GMT
Followup-To: sci.electronics
Organization: Eastman Chemical Company

In article <rich.726361718@pencil> rich@pencil.cs.missouri.edu 
(Rich Winkel) writes:
>Can anyone explain what a "Reike and Hartree diagram" is?

A Rieke diagram is sort of a fancy Smith chart for representing how the load
impedance and its point of connection to the magnetron can affect the power
output of the tube and its frequency.  Contours of frequency and power output
are plotted on an admittance circle diagram, a point on which respresents the
complex admittance of the load.  Sometimes an impedance circle is used in which
case a point represents the resistance and reactance of the load.  Another
form which typically uses a conventional polar representation for the complex
impedance (admittance) of the load is often called a load diagram.

A Hartree diagram shows the theoretical minimum anode voltage at which operation
is possible in the various modes of the magnetron.  Under operating conditions
the anode voltage must exceed the values given in the diagram.  The diagram
plots anode voltage on the vertical axis versus magnetic flux density on the
horizontal axis.

Another graph often found with magnetron design data is the performance chart
which plots a family of power outputs on a graph with anode voltage vs. anode
current.  Such a graph may contain additional lines of constant frequency or
constant efficiency.

Fortunately the designer of the magnetron has to worry the most about these
properties.  The designer of the oven has even less work with these things.
And the user of the oven just has to push the buttons - even my wife can
(usually) operate one!   ;-)
						Barry
 -----------------
|  ___  ________  |    Dr. Barry L. Ornitz          WA4VZQ
| |  / /        | |    Eastman Chemical Company
| | / /         | |    ECC Research Laboratories, Engineering Research Div.
| |< < K O D A K| |    Process Instrumentation Research Laboratory
| | \ \         | |    P. O. Box 1972, Building 167B
| |__\ \________| |    Kingsport, TN  37662  (615/229-4904, FAX 615/229-4558)
|                 |    INTERNET:   ornitz@kodak.com
 -----------------

{Don't even ask why someone at a chemical manufacturing company should know a
little about this subject!}     ;-)
Newsgroups: sci.electronics,alt.radio.scanner,rec.radio.amateur.misc
From: carter@cmptrc.lonestar.org (Carter Bennett)
Subject: Re: How to calculate crystal freq for scanner?
Date: Tue, 5 Jan 1993 21:51:26 GMT
Organization: CompuTrac Inc., Richardson TX

In article <1993Jan2.200922.19977@sequent.com> washer@sequent.com (Jim "Throw it over the wall" Washer) writes:
>I have a radio shack Pro-24 crystal controlled scanner..... (yep, poor me).
>It uses a 10.7MHz IF, and says to use third overtone crystals...
>
>So, am I correct in  calculating the crystal fundamental as:
>
>F(fund)*3 + 10.7MHz == Receive Freq?
>

Ahoy, Jim!

   Actually, you won't have to work that hard at it.  Most scanner crystals
sold are assumed to be third-overtone series type.  The bit about the
third-overtone is generally assumed.

   The IF is generally irrelevant in figuring crystal frequency, provided 
you're using the radio for the frequencies it was designed for.  [There
are some "tricks" using the IF to receive out-of-band signals, but they
perform so _badly_ that one is often better off buying a new radio].

   If you check with Radio Shack for your crystals, they will have a
frequency stamped on the side indicating the frequency you'll be receiving
if you plug it into one of their radios.

   If you go to a third-party manufacturer, you'll generally only be expected
to specify what frequency you want to receive and the make/model of the radio
you'll be using it in.

   If, on the rarest of occasion, they ask what "cut" you would like on the
crystal, then you could tell them you want it optimized for third-overtone
oscillation.  However, if they ask that, they are probably talking about
high-precision crystals which they will want several hundred dollars for, 
which you don't need for scanner.

   As a rule, stay away from used crystals.  However, don't pass up any
free give-aways just because they're used!  Just don't waste your money.

Have fun with your 24!
-- 
Carter R. Bennett, Jr. - Scientist | "Oh my God!  I _AM_ a nerd!!!"
carter@scilab.lonestar.org - home  | - C. Bennett, Sept 25, 1992, after
carter@cmptrc.lonestar.org - work  | realizing he had been talking about
KI5SR          | "market availability of preconfigured Toll-House cookies."
From: cab@col.hp.com (Chris Best)
Newsgroups: sci.electronics
Subject: Re: NEED SOLENOID ACTUATED WATER VALVE.....
Date: 6 Jan 1993 17:55:41 GMT
Organization: your service
NNTP-Posting-Host: hpctdke.col.hp.com

> 24 Vdc Hydronic Zone Valve, 1" tube 15PSI max diff.
> (no 12 Vdc units in the catalog)

----------

I doubt these are solenoid activated, but rather a
geared motor.  However, I don't think you'd want a
solenoid anyway, in a plumbing application, so these
would work fine.
Newsgroups: sci.electronics
From: phr@telebit.com (Paul Rubin)
Subject: Re: Vector wire pencils (and wire-wrap, and ScotchFlex)
Organization: Telebit Corporation; Sunnyvale, CA, USA
Date: Wed, 6 Jan 1993 02:23:17 GMT

In article <1993Jan5.035617.1065@cmkrnl.com> jeh@cmkrnl.com writes:

   I think ScotchFlex is *great* for prototyping and debug.  It is FAR
   more convenient than WW for debug -- because it's a lot easier to
   change.  Of course I'd never ship a product, not even a
   one-of-a-kind, that used it -- but that's not what it's for.

   Yes, the cost is relatively high on a per-DIP-socket basis, but
   everything except the wire is easily re-usable.  ie you can pull
   the wires off the back of a ScotchFlex board MUCH more easily than
   you could pull wire-wrapped wires off of wrap posts.

Ok, N different people have told us that stuff is great but expensive.
Now just how expensive is this stuff and where can I get some?
From: Ted_Eugene_Viens@cup.portal.com
Newsgroups: sci.electronics
Subject: Re: HDTV Question
Date: Sun, 10 Jan 93 20:46:18 PST
Organization: The Portal System (TM)
  <1993Jan10.180025.7684@mtu.edu>

>kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
>>
>
>I find it hard to believe that the above paragraph applies to the
>future of HDTV.  I do not believe "they" would approve of a system that could
>randomly change the bandwith or the resolution.  My question was more
>of "Have they decided yet, and if so, what did they decide?"
>
>------------------------------------------------------------------------------
>Christopher Wolf             Electrical Engineer                cmwolf@mtu.edu
>
>                             Quote of the hour:
>      Houghton, Michigan: Climate is what we expect, snow is what we get.
>------------------------------------------------------------------------------
>"A dead telephone sanitizer?" "Best kind." "But what's he doing here?"
>"Not a lot."
>                              - The Restaurant at the End of the Universe
>------------------------------------------------------------------------------
>
Technology is so hard to nail down.  A year ago your remark would have been
reasonable.  Then the words scalable and extensible entered the HDTV digital
bit stream and all hell broke loose.  Virtually moment by moment the resolution
and color depth can be changed.  The MPEG adjusted scene by scene.  and every
unused bit given over to services you would rather not know existed.  The main
reason the FCC extended the Advanced TV study was to give time for the cresting
wave of compressability and interleaved services.
Bye...  Ted..
From: vj@gserv1.dl.ac.uk (Dave Hines)
Newsgroups: sci.electronics
Subject: SAA5240 Teletext & SAB3036 tuner info wanted
Date: 6 Jan 93 15:56:40 GMT
Reply-To: D.Hines@daresbury.ac.uk
Organization: SERC Daresbury Laboratory, Warrington, UK
NNTP-Posting-Host: dlsi.dl.ac.uk

Hi there,
      I am looking for information on a computer teletext unit which I wish
use. It uses the SAB3036 tuner and SAA5240 teletext chips, and appears to use
a serial connection to a host machine. What I need is information on the
serial protocol used by these chips to accept commands from, & send data to,
a host machine. Can anyone help please ?

Thanks in advance,
		Dave.
--
Snail:	David Hines,  Daresbury Lab,	JANET:	D.Hines@uk.ac.daresbury
	Warrington,  WA4 4AD,  U.K.	Other:	D.Hines@daresbury.ac.uk
	('phone:  +44 925 603357)
From: albrecht@csd4.csd.uwm.edu (Chad Edward Albrecht)
Newsgroups: sci.electronics
Subject: Re: RS 232 & RS-422 voltage specs wanted
Date: 5 Jan 1993 15:12:55 GMT
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4

Standard RS-232 uses +/- 5VDC

--
>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
|  Respond to any of these adresses:    |  "Oh Lord...Ooooh you are so big..,|
|  --------------------------------	| So absolutely huge.  So ab - sol-  |
|  albrecht@csd4.csd.uwm.edu            | utely huge.  Gosh, we're all really|
|  albrecht@convex.csd.uwm.edu		| impressed down here I can tell you!|
|  acct146@carroll1.cc.edu		| --Monty Python: The Meaning of Life|
|============================================================================|
|  UWM-CSD UNIX/MICRO CONSULTANT  Phn# (414) 229-5370 [standard disclaimer]  | 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Newsgroups: sci.electronics,sci.energy,rec.autos