HDTenEightyP/NetNews huggingface dataset:
From: dbell@cup.portal.com (David J Bell)
Newsgroups: sci.electronics
Subject: Re: Enameled Wire - What is It?
Date: Wed,  6 Jan 93 18:59:19 PST
Organization: The Portal System (TM)
Distribution: usa

>In several books that I looked at recently some of the projects
>called for #27 enameled wire.  Can anyone tell me what enameled
>wire is and where one can purchase it?  Also, what kinds of applications
>would require enameled wire as opposed to other types of insulation?

>Thanks,

>George Gavaras


Enameled wire is, uhhh, enamel coated bare copper wire... 
Seriously, it's copper wire, most often of small gage, insulated
only with a very thin layer of clear (sort of amber/brown)
enamel.

It is used primarily for coil or transformer winding, where
the added thickness of "norma" insulation would occupy too
much space, allowing fewer turns of wire in the same volume.

Most any largish electrical/electronic supply house will have it.

Dave
dbell@cup.portal.com
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Sort of a Joke - sad though...
Organization: Motorola Computer Group, Tempe, Az.
Distribution: na
Date: Wed, 6 Jan 1993 15:29:48 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."
>
>What's the name of this sorry a**ed store.  If they have any stores in the
>Windy City area, I'll be sure to steer clear.  No reflection on you though !!
>Mike Behnke

If I remember, the Nintendo manual say that you should not connect
the game to projection TVs. Anyone know why? 

BTW: Duck Hunt is cool on a 7' Sony projector. :-)

John


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
From: mrk@gvgspd.gvg.tek.com (Michael R. Kesti)
Newsgroups: sci.electronics
Subject: Re: HDTV Question
Date: 11 Jan 93 03:15:27 GMT
Organization: Grass Valley Group, Grass Valley, CA
NNTP-Posting-Host: gvgspd.gvg.tek.com

In article <1993Jan8.055618.24902@mtu.edu>
                              cmwolf@mtu.edu (christopher m. wolf) writes:

>If HDTV will be digital, what will be the number of available colors for
>display?
>
>Instead of the "infinite" we have with NTSC now, this will have to be reduced,
>depending on the digitalization, but what are we talking about numbers-wise?

I think that Christopher ahs reached a false conclusion.  Try this analogy:

	If CDs are digital, what are the number of available pitches
	for playback.

Of course, being digital in no way limits the number of available pitches.
In the same way, there will not be a limit to the available number of colors
in HDTV.  I'm sure it's all tied up in Nyquist, and all that related theory,
but I'll admit that I don't know it well enough to lecture on it.  Perhaps
someone else can explain further.

-- 
============================================================================
Michael Kesti  Grass Valley Group, Inc. | "And like, one and one don't make
    mrk@gvgspd.GVG.TEK.COM              |  two, one and one make one."
    !tektronix!gvgpsa!gvgspd!mrk        |         - The Who, Bargain
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: Kearfot Variable Reluctance Stepper Motor
Organization: SSC, Inc.,  Seattle, WA
Date: Fri, 08 Jan 1993 20:19:08 GMT
X-Newsreader: TIN [version 1.1 PL6]

Tim Deagan (timd@fenian.dell.com) wrote:
: They were manufactured by SINGER and are labeled;
: Kearfot Variable Reluctance Stepper Motor
: They have four leads;  Black, Brown, Red and Orange
: RE, OR and BR all have 32 ohms between any pair, BL has 18 ohms
: between itself and any other lead.  (3 phase stepper?)
: 
: Sequential stepping of the OR RE BR leads does not do anything
: but make the shaft vibrate.

All VR steppers have at least 3 windings.  They don't have any
permanent magnets in them, and are polarity insensitive, like
a solenoid.  My guess is that the black lead is the common.
So putting current from the black lead to the other leads in some
sequence should move the motor.   Drive currents are either
on or off, (unlike the driving a Permenent Magnet stepper in
two winding (4 wire) mode).

Driving any one out of the three windings should cause the rotor to 
step to a postion, and switching the drive to another winding will cause 
it to step one unit either way.  You can get more torque by driving
two out of three windings at the same time.

One way to think of a simple VR stepper is 3 solenoids hooked up to
a crankshaft, arranged like a radial aircraft motor.


Mark Zenier  markz@ssc.wa.com
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: sony str 790 &^^^ help me
Date: Tue, 05 Jan 93 04:12:24 GMT
Reply-To: paula@nlbbs.uucp
Distribution: world
Organization: The Electronics Workbench - Cumberland Maine


In article <1992Dec29.4265.27306@dosgate> glen.mead@canrem.com writes:

 > 
 > 
 > BS>I own a Sony STR-790 surround sound and have the following problem.  Wit
 > BS>Scott speakers up front and two Infinity's in the rear (and a center one
 > BS>of course) when I turn up the volume a *bit* loud, crackling can be hear
 >  
        It could also be the death rattle of an overdriven speaker.  I
        buy the Radio Shack Minimus 7 for surround. They're guaranteed 5
        years. I'm on my third pair. "Star Trek - The Voyage Home"
        usually does it. <g>
Newsgroups: sci.electronics
From: jeroen@dxcern.cern.ch (Jeroen Belleman)
Subject: Re: Good way to prototype analog circuits?
Organization: CERN European Laboratory for Particle Physics
Date: Tue, 5 Jan 1993 11:05:50 GMT

In article <1993Jan3.231733.15225@ee.ubc.ca> jmorriso@ee.ubc.ca (John Paul Morrison) writes:
>
>Does anyone want to share their tips on prototyping analog circuits?
>Specifically: sensitive, high gain circuits; RF circuits etc.
>
>These kind of circuits work well with PC boards with ground planes,
>but are there any simple, easy to make changes, techniques for this?
>Are there any pre-made boards with a ground plane, and holes with solder
>contacts on them?
>
> John Paul Morrison                     |  

Hi Paul,

I use simple un-etched PC-board as a ground plane. Components are mounted
on little self adhesive pads, which exist in all kinds, from single
pads to many-pin DIPs. There are also controlled impedance striplines
of various impedances. You just stick them where you want them.

The pads are made by Wainwright Instruments. The only address I have
is in Germany:  Frieding, Widderberger Strasse 14, D8131 Andechs.

Best regards,
Jeroen Belleman
jeroen@dxcern.cern.ch
From: jfox@hooksett.East.Sun.COM (John Fox - SunExpress IR)
Newsgroups: sci.electronics
Subject: Electronics mags, anti-bark article
Date: 5 Jan 1993 15:13:01 GMT
Organization: Sun Microsystems, Inc.
Distribution: world
Reply-To: jfox@hooksett.East.Sun.COM
NNTP-Posting-Host: hooksett.east.sun.com


A few weeks ago, someone posted an article in response to a query about
building an anti-bark device. The article said there were plans in the
latest issue of one of the popular electronics mags. Unfortunately, I
don't recall the names of these magazines.
Does anyone know which magazine carried this? If not, could I get a run
down of what's published in terms of such magazines? I'm sure one of the
local libraries gets what I'm looking for.


Thanks,
John





Newsgroups: sci.electronics
From: clarke@acme.ucf.edu (Thomas Clarke)
Subject: Re: 74HC4046 help required.
Organization: University of Central Florida
Date: Wed, 6 Jan 1993 13:20:39 GMT

In article <1993Jan6.033742.14845@news2.cis.umn.edu> Mike Diack  
<mike-d@staff.tc.umn.edu> writes:
> In article <7116@m1.cs.man.ac.uk> Mark Robinson,
> mark-r@spec0.ee.man.ac.uk writes:
> >If anyone has a datasheet for the 74HC4046 PLL chip handy would
> >you let me know how the frequency of the VCO is related to the
> >values of R's and C and the max/min values that they can take.
> >
> >I want to run it with a lock range of about 1MHz, centred on
> >8MHz, but the equations in the Maplin catalogue don't allow
> >frequencies >2.8MHz (R=5k, C=50pF; ie the minimum allowed) even
> >though they claim the VCO can get up to 15MHz. I think their
> >data must be for the 4046 and none of our databooks are modern
> >enough to include the 'HC4046 :-(
> 
> Something you should be aware of is that all HC4046's are NOT 
> created equal. Two extremes I have found are
> 1 : An SGS device that was barely able to oscillate at  1 MHz
> (and the output waveform was triangular at that frequency)
> and -
> 2 : An RCA device that was still producing respectable square
> waves at 10 Mhz
> (Both devices running into a scope probe only , 5 volt supply)
> 
> At the frequency you want (8 Mhz) the design nomographs
> become a bit irrelevant, as internal Cs & Rs dominate the issue.
> 
> I was driven to using LS124/324s, but i only wanted the vco
> function, no doubt someone makes a better PLL.
> cheers,
Look at the Signetics NE564 - son of the old 560/1/2 .  It is a 
PLL that gets up to about 30 MHz and has a TTL buffered output!
--
Thomas Clarke
Institute for Simulation and Training, University of Central FL
12424 Research Parkway, Suite 300, Orlando, FL 32826
(407)658-5030, FAX: (407)658-5059, clarke@acme.ucf.edu
From: acct069@carroll1.cc.edu (Ron)
Newsgroups: sci.electronics
Subject: Cheap PcBoards needed
Date: 6 Jan 93 00:46:58 GMT
Reply-To: acct069@carroll1.cc.edu (Ron)
Organization: Lightning Systems, Inc.


I'm looking to have a small run of single sided pcboards made for a
project I've been working on.  However, I cannot afford to spend the large
sum of money that most manufactures want to set up a run of boards.

Does anyone know if there is a place that can do a small production run of
boards for a hobbiest such as myself for a reasonable price?

I'm looking to do about 50 boards approximately 2" by 2" each.

Please e-mail any information to the address below.

Thanks,
Ron                         |_    Lightning Systems, INC.
acct069@carroll1.cc.edu       |_  (414) 363-4282  200megs 
Apple // & Van Halen Forever!   | 14.4k USR Dual Standard 

-- 
Ron                         |_    Lightning Systems, INC.
acct069@carroll1.cc.edu       |_  (414) 363-4282  200megs 
Apple // & Van Halen Forever!   | 14.4k USR Dual Standard 
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Where to mount an outside temp probe on a car?
Organization: Motorola Computer Group, Tempe, Az.
Date: Mon, 4 Jan 1993 22:36:50 GMT

In article <86134@ut-emx.uucp> lihan@ccwf.cc.utexas.edu (Bruce G. Bostwick) writes:
>In article <1993Jan4.134028.27684@phx.mcd.mot.com>,
>schuch@phx.mcd.mot.com (John Schuch) writes:
>|>In article <1993Jan4.002944.6494@sequent.com> washer@sequent.com (Jim
>"Throw it over the wall" Washer) writes:
>|>>I'd like to mount a temp probe on my car to sample the air temp. I'd like
>|>>to get as accurate a reading as possible (without exceeding some reasonable
>|>
>|>I think I'd try either in the trunk, or inside one of the tail-light
>|>assemblies first. At sixty miles per hour, the airstream hitting the
>|>sensor will cool it nearly as much as being wet. You need to find
>
>BZZZT!   He _wanted_ the air temperature -- which means he _wants_ _maximum_
>"cooling" of the sensor.
>

Excuse me but if you cool the sensor by placing it in an airstream, your
not reading the actual temperature of the air. Reading a sensor cooled
by an airstream, by itself, tells you nothing. If you measure one sensor
in an airstream and another one nearby but shielded from the air stream,
you can determine the speed of the airstream. Other than that, I don't
know why you would want to cool the sensor.

You will note that weather stations keep the thermometer in a little
louvered box to break-up the wind. Even high-end indoor/outdoor
thermometers include a little shell to place over the external
sensor.

John



-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: Re: Magnetic Sensor?, hall effect, reed switches, etc
Date: 4 Jan 93 21:33:52 GMT
Organization: University of Pennsylvania, Mechanical Engineering


:Good magnetic sensors in disk drives , brushless DC motors or Car 
:ignitions use Hall Effect sensors that provide a solid state or linear 

:
:Cheaper sensors use magnetic switches when the contact frequency is low. 
:REED RELAYS are such a device.
:

my latest project needs a magnetic sensor to operate over a range 
from 0 to 100Hz.  I think this is at best pushing the limit
of what i can do with a reed switch.  How can i find out
out more about hall effect devices?  A small quantity supplier,
with data sheets would be nice..
--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
Newsgroups: sci.electronics
From: pagorm@iastate.edu (Paul A Gormley)
Subject: Re: PC BOARD ETCHING QUESTIO
Organization: Iowa State University, Ames, IA
Date: Fri, 8 Jan 1993 07:01:07 GMT


	Hi everyone,

	Just thought I'd stick my $.02 in.  John knows of what he
speaks.  It is a good idea to try the 2X or 4X trick and I do this in
really precise cases.  I have found though that not all of the shops I
have used can get the knack of EXACT reduction.  "You don't mind +-10%
do you?"   aaaaaaarrrrrrgggggh! The 1 to 1 seems to be the only sure
fire case for most of the ones that can't figure out there little 
wheels and stuff on the camera. 
	Once again I'd like to thank John for setting me straight on
the PMT term.  I have always wondered what the heck that was.  I
probably have 50 of so of them laying around my apartment and I felt
kind of strange not knowing exactly what they were. Anyway, I'm in the
process of detailing MY (not bad) process for at home etching.  I will
be working on this for the next couple days.  So if you are one of the
16 people who responded please be patient, I'm trying to do a good job
for you.  In the meantime please call Kepro at 
In the meantime please call Kepro at 314 343 1630.  There catalog will
come in handy when trying to understand wht I'm saying 
							See ya
								Paul
							[@:{)
							
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Vector wire pencils (and wire-wrap, and ScotchFlex)
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 6 Jan 93 08:42:13 GMT

Paul Rubin (phr@telebit.com) wrote:
: 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?
 



Robinson-Nugent makes an excellent system that is available through Viking
Distributors in Minnesota.  I think the price was @$150 for a roll of 1000
pins; the Teflon coated wire was expensive but I don't remember the price.

And as for not shipping a product that used it, a few years ago I made a piece
of test equipment that used the R-N system that was taken on-site to a shock
test facility to test a piece of equipment that we had buit for the US Navy.
From the feedback that I had gotten from the engineers that had used my tester,although it wasn't the item being shock tested, it did get bounced around some,no wires came off and it performed beautifully.  I thought that was a pretty
good testiment for something that was handmade.


Jerry


"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues

: 
Newsgroups: sci.electronics
From: cmwolf@mtu.edu (christopher m. wolf)
Subject: Re: HDTV Question
Organization: Michigan Technological University
Date: Sun, 10 Jan 1993 18:00:25 GMT

kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
>
>Well, first of all an analogue signal doesn't really have an infinite number
>of divisions if it's represented as a voltage or a current, because they are
>both quantized.  You can't get any unit of charge less than an electron.  It's
>just that the number of divisions is extremely large.

If manufacturers can say their device with a adjustment potentiometer has
an infinite number of settings, so can I.  :-)

>
>In addition, the linearity of the encoding comes into play here.  With the 
>NTSC encoding scheme, not very many colors are possible.  But, the number of
>colors is going to be a function of the dynamic range of the system and is
>therefore dependant on the bandwidth you want to allocate.
>
>In a digital system, it's the same way.  If you allocate more bandwidth, you
>can get more of a color range, or you can get more resolution.  The nifty
>thing about digital systems is that it permits much easier allocation of
>bandwidth (even on the fly!), and although digital encoding generally uses
>more bandwidth than the theoretical minimum of an analogue system, because
>the baseband signal can be better packed into the available space, it can
>be more efficient.

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
------------------------------------------------------------------------------
Newsgroups: sci.electronics
From: daniel@vicorp.com (Daniel Dee)
Subject: MouseSystems Mice
Organization: V. I. Corporation, Northampton, Massachusetts
Distribution: usa
Date: Mon, 4 Jan 1993 22:40:26 GMT

Are mice made by MouseSystems pretty much compatible
except for the connector? I opened up a generic 
MouseSystems mouse (probably for a PC) and a Sun version
of it, and they look like they have the same components
inside. I'm thinking of modifying one and use it on
my Macintosh. Is this possible? Any answer will be
appreciated.
-- Daniel (ddee@vicorp.com)

Newsgroups: sci.electronics
From: tron@ux1.cso.uiuc.edu (Tron R.)
Subject: Re: MouseSystems Mice
Organization: University of Illinois at Urbana
Distribution: usa
Date: Sun, 10 Jan 1993 22:19:44 GMT

rmf@bpdsun1.uucp (Rob Finley) writes:

>It is true that the Sun and PC versions are identical except for the
>front sticker and the wiring harness.  However, I don't have much faith
>that it would work on a mac though.  Noting the specs for their IDB bus,
>it doesn't look too promising.  At least, you will need a different mac
>driver.

>Mouse systems does make Apple Mice.  Anyone have such a beast?

I have a 3 button mouse for my Mac from mouse systems. I doubt that you can
take an Sun or PC mouse and use it with a Mac since Mac mouses are ADB
devices. Then again this is only my speculation.

Tron
From: gkwan@balboa.eng.uci.edu (Greg Kwan)
Subject: Re: HDTV Question
Newsgroups: sci.electronics
Organization: University of California, Irvine
Date: 11 Jan 93 05:52:30 GMT

>Well, first of all an analogue signal doesn't really have an infinite number
>of divisions if it's represented as a voltage or a current, because they are
>both quantized. You can't get any unit of charge less than an electron. It's
>just that the number of divisions is extremely large.

Reminds me of a saying a boss had on his whiteboard (we were the only
digital guys in an analog company):

``Analog is really digital. It's just that the sampling rate is
  Avogadro's Number.''

[He also had ``E=mc^2 +/- 1 LSB.'']

greg
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: Re: How can I align a cassette tape head?
Date: 12 Jan 93 20:49:47 GMT
Organization: Kernel Mode Consulting, San Diego, CA

In article <7380104@hpnmdla.sr.hp.com>, donrm@hpnmdla.sr.hp.com (Don Montgomery) writes:
> In sci.electronics, bb099@cleveland.Freenet.Edu (Adam Trent Phillips) writes:
> 
> 				    [...]
>>  But to adjust the tape head there is usually one of the screws that has a 
>>  spring and a washer under it. the head it pivoted on the other, fixed screw.
>                                     [...]
> With this type of adjustment, I've always had good luck recording a monaural
> sinusoid on a recorder known to be in alignment, then playing the tape on
> the machine in question and adjusting the screw for a null in a pair of stereo
> 'phones that have the L-R common disconnected.  You could also make a differ-
> ential measurement with a dual-channel 'scope if you didn't trust your ears.
> 
> Don Montgomery
> donrm@sr.hp.com

My experience is that stereo cassette decks' two channels are often not matched
in level well enough to allow head alignment by any "differential" method.  
This includes Lissajous patterns, "A plus B with B inverted" on a scope,
headphone with a missing L-R common connection, etc.  

It is much easier just to use a dual-trace scope, display the two channels
(chop or alternate mode doesn't matter, as long as you are always triggering
from the same channel, of course), and adjust to make the peaks line up with
each other. 

If you have the time, patience, test tapes, other equipment, and information
necessary to do a complete electrical alignment first (including matching
levels), then fine, no problem.  

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh