HDTenEightyP/NetNews huggingface dataset:
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: PC BOARD ETCHING QUESTIO
Organization: Motorola Computer Group, Tempe, Az.
Date: Thu, 7 Jan 1993 14:20:18 GMT

In article <C0G66I.Bvu@news.iastate.edu> pagorm@iastate.edu (Paul A Gormley) writes:
>	Hi,
Hi.

>I also use a great device for exposing called a pmt.  I think this 
>stands for photo mask transfer, but I'm not sure.

Positive Mechanical Transfer. If you change your resist chemistry,
you can also use a litho negative, which they shoot on the same
camera and usually costs less. I, however, use PMTs.

>I get these done at a blueprint shop but you can do them anywhere that
>has a large exposing lab.  Usually like a photo-lab or blueprint shop.

Look under "Lithographic Negatives" in the yello pages.

>can cost upwards of $20 for a rather large one, but if you go to a
>good shop with a good camera man you can get PERFECT 1 to 1 shots of
>your layouts.  I always accompany the people who shoot my layouts.

I pay $14.75 for a 50% shot, 8X10 final size PMT
If you have a very small 1:1 shot, and are REAL good at begging, you
can sometimes get them to stick your art into the wasted edge of
someone elses large job. The material would have been thrown away
anyway.

>They tend to understand the importance of perfection when you explain
>to them what you are doing. 

Everyone should understand that the litho camera will faithfully
reproduce your artwork, AND EVERY DEFECT ON IT. I almost never
work less than 2X final size and sometimes work at 4X for real
fine line work. Tripple check your artwork fcr problems like
hairs, smears, etc.

John

-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
From: cmh@eng.cam.ac.uk (C.M. Hicks)
Newsgroups: sci.electronics
Subject: Re: 4x Oversampling Compact Disc Specs........
Date: 4 Jan 93 20:41:24 GMT
Organization: cam.eng

christos@kuhub.cc.ukans.edu writes:

>Hello there,

>	I have a question on compact disc specs. Does the 8x oversampling mean
>8x8000 samples per second?

Compact discs store two channels of audio data at 44.1 ksamples/second/channel.

Most CD players use digital oversampling to increase the sample rate at the
DAC, relaxing the requirement for a high-order analogue filter after the DAC.

[ Long and often argued-about explanation of oversampling left out... ]

In the example you quote (8x oversampling), the sample rate at the DAC will be
8 x 44100 = 352.8 ksamples/second/channel. Four times oversampling is most
common because Philips produce a cheap chipset to do the job with virtually
no glue logic.

Christopher Hicks


--
 ==============================================================================
 Christopher Hicks    |    If it doesn't fit...
 cmh@uk.ac.cam.eng    |                        ...you need a bigger hammer.
 ==============================================================================
Xref: sparky sci.electronics:22394 sci.energy:6775 rec.autos:31449
From: jimf@centerline.com (Jim Frost)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 11 Jan 93 14:26:54 GMT
Organization: CenterLine Software, Inc.
NNTP-Posting-Host: 140.239.3.202

rubin@skiing.cis.ohio-state.edu (Daniel Rubin) writes:
>It is extremly difficult and blasting caps will not do it.  You
>may be thinking of nitrocellulose or "gun powder" it can be made to detonate,
>but again that is extremely difficult.

I think you mean "gun cotton."

jim frost
jimf@centerline.com
Newsgroups: sci.electronics
From: jmorriso@ee.ubc.ca (John Paul Morrison)
Subject: Re: Vector wire pencils (and wire-wrap, and ScotchFlex)
Organization: University of BC, Electrical Engineering
Date: Sun, 10 Jan 1993 01:00:10 GMT

In article <PHR.93Jan5182317@napa.telebit.com> phr@telebit.com (Paul Rubin) writes:
>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?
>


OK, so it's good, but just what *is* it? How does it work?
Nobody I know is familiar with it, so can someone describe the system
and the parts etc.

-- 
__________________________________________________________________________
 John Paul Morrison                     |  
 University of British Columbia, Canada |  
 Electrical Engineering                 |   .sig file without a cause
 jmorriso@ee.ubc.ca              VE7JPM |  
________________________________________|_________________________________
Newsgroups: sci.electronics
From: pmw2c@csissun10.ee.Virginia.EDU (Paul Michael Wayner)
Subject: Re: Detecting Sine Wave freq
Reply-To: pmw2c@csissun10.ee.Virginia.EDU (Paul Michael Wayner)
Organization: University of Virginia
Date: Sun, 10 Jan 1993 22:49:50 GMT

In article <1993Jan10.052336.9972@ssc.com>, markz@ssc.com (Mark Zenier) writes:
|> Paul Michael Wayner (pmw2c@csissun10.ee.Virginia.EDU) wrote:
|> : I'm interested in designing a circuit that will determine
|> : if a sine wave frequency is in a certain range of values,
|> : specifically, 45-51 MHz.  It is very important that the
|> : detector be as reliable a possible, so I would like to use
|> : only a few active components and try to stick to RC's as
|> : much a possible.
|> 
|> (At that frequency, every wire is an inductor, whether you 
|> want it to be or not.)

All too true.

|> 
|> How sensitive?  And is the input an antenna or a high level
|> signal?  A low level signal?   What kind of noise or
|> interference?  More than one signal at a time?  Fixed or
|> Variable frequency?  Is the output an on/off digital signal, or
|> a amplitude, a blinking light, a spectrum display, etc. ...
|> 
|> [In other words, your spec. is a little vague.]
|> 
|> Mark Zenier  markz@ssc.wa.com  
|> 

Excellent questions! I apologize for not being more specific.
The input is a 5 Vpp signal on a PCB.  Noise and interference
minimal.  Only one signal, fixed frequency, with a on/off 
digital output.

					Paul Wayner
Newsgroups: sci.electronics
From: josh@Happy-Man.com (Joshua_Putnam)
Subject: Re: Battery Gell cell or Lead acid?
Reply-To: Joshua_Putnam@happy-man.com
Organization: Happy Man Corp., Vashon Island, WA 98070-7399
Date: Wed, 6 Jan 1993 19:25:44 GMT

In <1993Jan5.145618.8600@oclc.org> fhn@oclc.org (James Feehan) writes:

>I am in the process of making a rechargeable bicycle light and wanted to know 
>which type of battery would be better Gell Cell or a Lead Acid. What are the 
>pros and cons of each? I have heard that it's not a good idea to fully 
>discharge a Lead Acid is this true?  Also how would the cold effect each of 
>these types of batteries?

A gel cell is really a lead-acid gel cell -- the difference is
whether the battery acid can spill all over your hands when you
tip over the battery :-0

The battery will last longest if kept fully charged, but not
overcharged.  Deep discharge will damage batteries not designed
for it.

Cold reduces the speed of chemical reactions in the battery, so
you should de-rate its capacity & maximum current in the cold.
This isn't a big problem in most bicycle applications.  My
headlight battery is in a neoprene-insulated nylon bag, and the
battery stays above ambient temperature from the heat generated
during charge/discharge.  It works fine in the mid-teens, but I
haven't tried riding with it in weather colder than that.

There are numerous articles discussing homebrew bikelights in the
rec.bicycles.* archives, including a discussion of batteries, I
believe.
-- 
 Joshua_Putnam@happy-man.com    Happy Man Corp.  206/463-9399 x102
 4410 SW Pt. Robinson Rd., Vashon Island, WA  98070-7399  fax x108
 We publish SOLID VALUE for the intelligent investor.  NextMail OK
Info free; sample $20: Send POSTAL addr: Solid-Value@happy-man.com
Newsgroups: sci.electronics
From: cn0gr8af@hydra.unm.edu (Student Class Account)
Subject: Pen or Stylus PINOUTS for Summa Graphics Tablet 1208 (or something like that)
Date: Fri, 08 Jan 93 02:51:47 GMT
Organization: University of New Mexico, Albuquerque

I would like to make a Pen input for my SummaGraphics Professional 18x12"
digitizing tablet (with the 4 Button puck).  I believe the model # is mm1208 
or mm1808 (or something similar).  There is a 9 pin port provided for such a 
device, and although I could probobly buy one, I would like to make it.

I would welcome any information on Pinouts for this port, plus any other 
info on how these things work that anyone deems useful.

Many thanks in advance,
Rusty


Xref: sparky sci.electronics:22319 rec.audio:18144
From: mcci@menudo.uh.edu (L. Jose)
Newsgroups: sci.electronics,rec.audio
Subject: Remote control code for Memorex AV4
Date: 9 Jan 1993 16:33:28 -0600
Organization: Academic User Services
Distribution: world
NNTP-Posting-Host: menudo.uh.edu


	I am having a problem trying to make my television function with
my remote control.  What the instructions say is to program the remote
control by entering the product code of the TV. Will anyone outhere tell me 
what the code is for a 27" Hitachi TV.  My remote control unit is a
Memorex AV4 model.  I called the company at 1-800-323-2601 but the
number is inaccesible from this area. 
	Also I have a JVC xl-g3500 CD car player.  My problem is the
wiring instructions are not printed on the radio and I would love to
hook up this unit.  Can anyone provide me with the right order of
connections that is which wire is ground, power, antenna, etc.
	One other important question I need to ask is does anyone know where I
can get info on how beepers or cellular phones work?

	I enjoy figuring out how things work and operate and just
recently found out this groups existed.  My background in electronics is
limited but I am in training and would like to know the name of the
groups available on this topic the more technical the better.

Thank you for your time.
Was this the right group to post to BTW? 
					:) :)....


Newsgroups: sci.electronics,rec.games.programmer
From: rdippold@cancun.qualcomm.com (Ron Dippold)
Subject: Re: Sort of a Joke - sad though...
Organization: Qualcomm, Inc., San Diego, CA
Distribution: na
Date: Wed, 6 Jan 1993 19:48:54 GMT

schuch@phx.mcd.mot.com (John Schuch) writes:
>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. :-)

Projection TVs are especially sensitive to burn-in.  Since video games
often have many sections that stay static (such as the status area at
the bottom, frames around views, etc) compared to most TV displays
(Wonder about that @#$!! VH1 logo?) it's more likely to burn something
in. 
-- 
Neil Armstrong tripped.
Newsgroups: sci.electronics
From: neal@cmptrc.lonestar.org (Neal Howard)
Subject: Re: Where to mount an outside temp probe on a car?
Date: Mon, 11 Jan 1993 19:35:52 GMT
Organization: CompuTrac Inc., Richardson TX


Some Cadillacs have the outside temp sensor mounted inside the mirror housing
on the driver's side door. This way it's protected from direct airflow and
water, but is still "open" enough to the outside air for a fairly accurate
reading.
-- 
=============================================================================
Neal Howard   '91 XLH-1200      DoD #686      CompuTrac, Inc (Richardson, TX)
	      doh #0000001200
         "Let us learn to dream, gentlemen, and then perhaps
          we shall learn the truth." -- August Kekule' (1890)
=============================================================================
From: levy@levy.fnal.gov
Newsgroups: sci.electronics
Subject: Who stocks DRAM NMBS AAA2800P-80?
Date: 5 Jan 93 16:29:37 GMT
Organization: Fermilab Computing Division

I'm looking for a 256Kx1 DRAM chip, number NMBS AAA2800P-80.  I need 36 of these
or a suitable substitute.  I have a number of 41256's around, but I don't have
the data to see if they're compatible.  

Anyone know of a source, or if the 41256's are indeed compatible?

================================================================================
[ Mark E. Levy, Fermilab          |                                            ]
[ BitNet:   LEVY@FNAL             | Unix is to computing                       ]
[ Internet: LEVY@FNALD.FNAL.GOV   |       as an Etch-a-Sketch is to art.       ]
[ HEPnet/SPAN: FNALD::LEVY (VMS!) |                                            ]
================================================================================
Newsgroups: sci.electronics
From: Dmerrill@bnr.ca (Dana Merrill)
Subject: Re: white noise generator using pseudo-random series
Followup-To: sci.electronics
Organization: BNR
Distribution: usa
Date: Fri, 8 Jan 1993 20:49:07 GMT

In article <C0JMov.J7A@uceng.uc.edu>, xhan@uceng.uc.edu (Xiaoping Han)
wrote:
> 
> Hi netter,
>   I am thinking about building a white-noise generator (audio band)
> with a pseudo-random series generator, followed by a LP filter
> (sort of 1-bit D/A). Any comment, suggestion, etc?
>   Does anyone has any information on one-chip solution to pseudo-random
> generation (>16 bit)?  Basically there is nothing in it but a
> clock, a shift registor and several XOR gates. 
> 
> Thanks in advance. email or post are both fine.
> 
> Han.                            xhan@uceng.uc.edu

I have done exactly what you describe, except for a different (wider)
bandwidth.  I needed a noise source which included the spectrum between the
voice band and higher band generators that were avaliable at that time
(1981).  I used a 20 bit register clocked at 10 Mhz followed by a 1Mhz
lowpass to generate a noise bandwidth that was virtually flat from DC to 1
Mhz (filter cutoff).

As I recall, the bandwidth is defined by approximately 1/2 the clock
frequency as the high end and 1/(pseudo random pattern length) at the low
end.  So in my case I had an unfiltered bandwidth of around 9Hz to 5Mhz. .
.   Well, the more I think about it, the upper range may not be right,
seems like it may have been more like 1/10 the clock frequency. Sorry, its
been a while!

Anyway I believe the low end is right:

    Pattern length = 2^20 = 1.049Mb
    Pattern cycle time = 1.049Mb/10Mb/s = .105s
    Lowest frequency component = 1/.105 = 9.5Hz

Anyway, your idea is definitely valid and will work.  Maybe a PAL for your
single chip logic.  For voice band you probably will not need so many
registers; depends on how low you want to go.

Hope this helps.

dam

==================================================================

Dana Merrill                                Bell Northern Research
DMerrill@BNR.CA                         Research Triangle Park, NC
==================================================================
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: NEED SOLENOID ACTUATED WATER VALVE.....
Organization: Motorola Computer Group, Tempe, Az.
Date: Wed, 6 Jan 1993 15:38:13 GMT

In article <C0Eoqw.5Dq@techbook.com> philb@techbook.com (Phil Biehl) writes:
>Hi. In examining my hydronic (hot water basboard) furnace, I find that
>it is divided up into three zones. What I'd like to do is put in
>electrically operated valves that controlled via a microcontroller and
>three separate thermostats, one for each zone. I need to find a source
>for these valves that will fit 7/8" copper piping. 12 Volt coils would
>be nice but not absolutely necessary. 
>Any and all help appreciated

W.W. Grainger
catalog page 2130
Part #2E164
Cost $70.05

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

Call 1-800-323-0620 and ask for the closest location.

BTW, these guys are wholesale only so you'll probably need
a tax number or business lic. to buy it.

John


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Newsgroups: sci.electronics
From: kingpin@spiff.gnu.ai.mit.edu (Joe Smooth)
Subject: PADS-PCB and PADS-Logic question
Organization: None
Distribution: sci
Date: Sat, 9 Jan 1993 19:35:32 GMT

I have been having trouble importing my PADS-Logic schematic into the PADS-PCB
layout software.. I follow the instructions exactly as the documentation
says, but still it messes up.. has anyone else had problems or trouble
getting the PADS-Logic schematic into the PADS-PCB program? if so, please
let me know! thanks!
Newsgroups: sci.electronics
Subject: PROBLEM with 68HC11 input capture
From: geoffrey@cosc.canterbury.ac.nz (Geoff Thomas)
Date: Tue, 5 Jan 1993 22:44:33 GMT
Organization: University of Canterbury, Christchurch, New Zealand


I'm having a few problems with spurious timer values being reported
by the input captures on my HC11A1FN (EVB). The chip is set up so
that output compare 1 triggers the three input captures at varying
times. The IC value are then copied out into RAM. The problem is this:

when the IC triggering is very close to the OC1 switching, the IC values
(in one of the 3 ICs anyway,) don't change.

i.e.: (see the drawing below:)

				________   _______
OC1 (active low pulse):			|_|

ICx input			________________   ____
 (triggering on falling edge:			|_|

ICx triggered at point T:	.................T.....


Difference in times:			|-- d --|


When <d> becomes very small, the value from the input capture being
tested 'freezes'; it stops at a value and doesn't change. It seems
to work fine when <d> is fairly long, and <d> is different for each
input capture.

Is the chip stuffed? (worst fears :-< )
or is there something else not quite as serious that I've overlooked ( :-| )

Any help PLEASE!!!

Geoff Thomas
Newsgroups: sci.electronics
From: ornitz@kodak.kodak.com (Barry x24904/ER/167B-TED)
Subject: Re: Receiver Pre-amps
Followup-To: sci.electronics
Summary: Try a better antenna
Keywords: pre-amp, intermodulation, antenna
Organization: Eastman Chemical Company
Distribution: net
Date: Tue, 12 Jan 93 22:04:13 GMT

In article <1993Jan12.202208.17471@ecsvax.uncecs.edu> crisp@ecsvax.uncecs.edu 
(Russ Crisp) writes:
>I'm looking for a good quality low noise figure mast mounted
>pre amp for FM broadcast band reception.  Ideally, the unit
>should have 20 or more dB gain, with noise of 3 dB or less.
>Prefer 300 ohm input, and 75 ohm output.  It would be nice to 
>have a tuneable notch filter too, and maybe use GaAs FET's!
>Anyone have any ideas one where I could look for something
>that fits this description?

This should be a pretty trivial design using one of the microwave monolithic
integrated circuits such as those made by Mini-Circuit Labs or Avantec.  A
MCL MAR-6, for example, will cost less than $3 and provide 20 dB of gain at
100 MHz with a NF below 3 dB. It will require two (chip-style is preferred)
coupling capacitors, a resistor, an RF choke, and a power supply to be fully
functional as an RF amplifier.  For 75 ohm input, a 4:1 balun will be needed.

However, you will likely find your reception will be worse with such an
amplifier.  Most FM receivers, even the most expensive models, are very
susceptible to front-end overload.  With such an amplifier, the entire FM
band may turn into nothing but intermodulation products on your receiver.

Have you considered a directional gain antenna?  In your location, strong
signals are very likely from Greenville, Asheville, and (maybe) Knoxville
stations.  If you are trying to listen to a weak, distant station, a better
antenna will do far more than an antenna mounted preamp.  The antenna will
have gain in one direction but nulls off the sides and back.  Positioning
the nulls properly may make all the difference.

					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
 -----------------
From: cjp@megatek.com (Chris "Systems Stud" Pikus)
Subject: Re: Recommend a book on "Patenting Your Invention"?
Organization: Megatek Corporation, San Diego, California
Date: Mon, 11 Jan 1993 21:40:29 GMT

> kehoe@netcom.com (Thomas David Kehoe) writes:
> 
> >Would someone recommend a book about "How To Patent Your 
> >Invention"?  There must be several available.


 
bhayden@teal.csn.org (Bruce Hayden) writes:
> If you are an attorney, and want to advise someone else, 
> instead of writing a patent yourself, I would suggest one
> of the patent bar sets of books. I used Kayton, and it is
> very good. By the time you get done, you know what you need
> to at least know when you are getting in trouble.
> 
> Much of the paperwork is described in 17 C.F.R. and the MPEP
> (Manual of Patenting Examining Procedures). These are the bibles.
> 
> Bruce E. Hayden
> (303) 758-8400
> bhayden@csn.org
>

	Actually, I believe that it is 37 CFR that has the relevant
patent regulations.  You are correct about the MPEP though.

	I've also seen several books on do-it-yourself patent work
in the bookstore. Most likely they are from Nolo Press. Perhaps you
should check around your better bookstores in the "(consumer) law"
section.

-- 
Christopher J. Pikus,        | "Forgive me for not knowing about El Salvador. 
Megatek Corp., San Diego, CA | Like it's not like I'm ever going to go to Spain
INTERNET: cjp@megatek.com    | or anything."	  -- "Buffy the Vampire Slayer"
Newsgroups: sci.electronics
From: gav553@cbnewsi.cb.att.com (george.w.gavaras)
Subject: Enameled Wire - What is It?
Organization: AT&T
Distribution: usa
Date: Wed, 6 Jan 1993 20:49:32 GMT

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
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: HELP WANTED: How to add a video output socket to a TV?
Date: 13 Jan 93 05:19:55 GMT
Organization: AI Programs, University of Georgia, Athens

If the TV uses a transformerless power supply, it is not safe to add a
video output socket, because TV circuit ground is coupled to one side
of the power line.  Or so I recollect from old TV schematics.

-- 
:-  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: tlai@cs.toronto.edu (Tony Wen Hsun Lai)
Subject: Re: HDTV Question
Organization: Department of Computer Science, University of Toronto
Date: 8 Jan 93 21:10:51 GMT

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?

All the HDTV systems that I've heard of have a larger color gamut than
Never Twice the Same Color.  I believe the systems can all represent
something like 16,000,000 colors or more.
Xref: sparky sci.electronics:22145 sci.energy:6692 rec.autos:31126