HDTenEightyP/NetNews huggingface dataset:
From: rubin@glockenspiel.cis.ohio-state.edu (Daniel Rubin)
Newsgroups: sci.electronics
Subject: Sources for Motorola Chips !!
Date: 4 Sep 92 17:04:04 GMT
Article-I.D.: cis.1992Sep4.170404.4222
Organization: The Ohio State University Dept. of Computer and Info. Science

Does anyone know of a good and economical suppliers of Motorola chips?  I am
looking for linear and microprocessors for the most part!  I have the Digikey
and Mouser catalogs and neither one sells Motorola?

Thanks								- Dan
-- 
  Daniel Joseph Rubin    |  "...A good football team for the alumni, parking
rubin@cis.ohio-state.edu |  for the faculty and sex for the students."
      GO        GO       |  - President E. Gordon Gee on the three things that
    BENGALS  BUCKEYES    |  a great university president must provide.....
From: rkarlqu@hpscit.sc.hp.com (Rick Karlquist)
Date: Thu, 27 Aug 1992 17:38:50 GMT
Subject: Re: Humidity Sensor Needed (Cheap!!!)
Organization: Hewlett-Packard, Santa Clara, CA
Newsgroups: sci.electronics

In sci.electronics, neal@cmptrc.lonestar.org (Neal Howard) writes:

> Can anyone out there help me with my search for something to use as an
> electronic relative humidity sensor. So far my search has revealed the following

How due the "dew" detectors in VCR's work?  Are they humidity sensors?
From: galenr@hpgrla.gr.hp.com (Galen Raben)
Date: Sat, 29 Aug 1992 02:34:15 GMT
Subject: Re: Damark catalog
Organization: Hewlett-Packard, Greeley, CO
Newsgroups: sci.electronics

In sci.electronics, newsman@milton.u.washington.edu (Chris Ricci) writes:

>I am looking for the address or the phone number for Damark.  Does anyone
>happen to have it.  I would appreciate it.  Thank you!

>Chris

7101 Winnetka Ave. N.
PO Box 29900
Minneapolis, MN 55429-0900

1-800-729-9000

Your welcome!
- Galen -

Newsgroups: sci.electronics
From: kolbjc@infonode.ingr.com (Chris Kolb)
Subject: magnetic acceleration
Keywords: HELP!!
Organization: Intergraph Corporation, Huntsville, AL.
Date: Wed, 26 Aug 1992 17:43:29 GMT


I have read an article or two on the possible upcoming craze
of shooting cargo, warheads and the such by using electro-
magnetic rings. I find this very interesting and would like 
to find out more about it. If you know what this process is 
called so that I can look it up a little more successfuly I
would appretiate it most magnetically!! 


KOLB
From: jfw@ksr.com (John F. Woods)
Newsgroups: sci.electronics
Subject: Re: Amperage meaning?
Date: 27 Aug 92 14:23:16 EDT

massoud@chemteca.sdsu.edu (Massoud Ajami) writes:
>In article <1992Aug25.192312.22175@javelin.sim.es.com> pashdown@javelin.sim.es.com (Pete Ashdown) writes:
>>Alright, so I admit it, I've forgotten a bit of my physics.  The question is
>>this:  I recently purchased a small transmitter that can work off either a 9
>>volt battery or a 12 volt power supply.  I happen to have a 12 volt power
>>supply that I use to power my laser, but it is at 2.5 amps.  I realize that
>>this amperage is far more than I need for the transmitter, but is it too much?

>Let me tel you this: do you know that your car battry can supply like 300 
>ampers if it is needed, but doesn't do any damage to your car radio! Having 
>more supplied current to a device is like going to "all you can eat" place, 
>any device draws as much current as it needs, but you can not under supply 
>the current.

One thing to be aware of -- if the 12V power supply is a computer power supply,
and if it is a *switching* power supply, it may well have a _minimum_ current
requirement in order to maintain regulation.  If the power supply has a big,
heavy transformer, it's most likely a linear supply, in which case it will be
happy loafing at a light load.  If the supply came out of a peecee, and if the
transmitter is a tens-to-hundreds of milliamps load, you might be in trouble
(easily rectified (heh), though:  put a 12ohm, 12W resistor across the power
supply to guarantee an amp of output current, which should keep the supply
happy.  Maybe 24ohms, 6W (for .5A) would do.).
Newsgroups: sci.electronics
From: iott@rtsg.mot.com (Joel K. Iott)
Subject: Degradation of Electronic Components
Followup-To: sci.electronics, rec.games.pinball
Organization: Motorola Inc.
Date: Fri, 28 Aug 1992 20:06:05 GMT

Some recent postings in rec.games.pinball have dealt with the problem of
gradually weakening flippers.

Some people say that the solenoid coils wear out over time, making the flippers
weak.   Others have said that the coils do not wear out, the mechanical linkage
wears out.  FYI, the solenoids in pinball machines are typically ~40VDC, coils
of wire which exert an electromagnetic force on an iron core.  The core is
connected to a physical linkage to perfom various actions.  Most coils are
energized for short periods only, with the exception of the flipper coils,
which can be energized as long as the player holds in the flipper coil.

So, what is the electronic theory and practice of degration of induction coils?

Or more generally, how do different types of electronic components wear out?


Some previous discussion follows...

In article <5959@transfer.stratus.com> overturf@bigbootay.sw.stratus.com (Dallas Overturf) writes:

>In article <1992Aug26.194642.13344@javelin.sim.es.com> dpettit@javelin.sim.es.com (Daina Pettit) writes:
>>I've been told that coils *never* wear out.  Instead they burn/short
>>themselves to oblivion.  Besides the EOS problem you mentioned flippers get
>>weak because the coil sleeve, which is usually nylon, wears out/gets dirty,
>>and the linkages get loose and start to bind.  Very rarely do coils have to
>>be replaced.  
>
>Well I've never taken apart a coil to prove this but I do
>disagree.  They most certainly do "wear out"  Probably in the
>form of small short circuits that cut the power but allow the coil
>to work.  Consider my following hypothesis:
>
>The coil has, lets say a single winding for simplicity and has
>5000 turns on the winding.  Now all the vibration of the 
>coil itself being used and all the other little things going
>on in the machine may eventually cause minor shorts in a few places
>in the coil.  Say turn #1 to turn #10 and a few others in between.
>All of a sudden your 5000 turn coil is now a 4000-4500 turn coil and
>a bit weaker.  Assuming the coil-stop and plunger are in good shape
>and the power to the coil is good what else would make the coil weak???
>
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Amperage meaning?
Date: 25 Aug 92 20:50:31 GMT
Organization: University of Georgia, Athens

Voltage is the pressure that drives a current (amperage) through a load.

The way a power supply works is this:

the rated _voltage_ is the actual value you'll get;
the rated _amperage_ is the maximum permissible.

The load determines how many amps will actually flow.  
So the relevant question here is whether your load consumes more
than 2.5 amps.  If not, you'll have no problem.
-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - don't tie education to an unpredictable income.
From: kgreen@ee.rochester.edu (Kenton A. Green)
Newsgroups: sci.electronics
Subject: Motion detector
Summary: need help with a motion detector
Keywords: motion detector
Date: 29 Aug 92 22:58:47 GMT
Followup-To: kgreen@ee.rochester.edu
Distribution: sci.electronics
Organization: Univ of Rochester, College of Engineering and Applied Science

A year ago a found a funny disc shaped thing in the apartment I moved into.
It had three wires (red, blue, black) and two adjustable screws, called
time delay and sensitivity.  It wasn't until yesterday when I saw one
attached to the wall of the bathroom here at the U of Rochester that I
realized it was a motion detector.

So, now I am sort of interested.  Cold someone give me a general description
of what the three wires are (power, ground, and ??) and what the time delay
has to do with it.

If I had to guess, I would say red is 12 volts, black is ground, and blue goes
high (12 volts?) when motion is detected, but I am not eager to attach 12v
and fry it.

There does not appear to be any identifying marks as to who made it or anything
(which I find amazing).  Sorry.

Anyways, any help would be appreciated.  Send email to:

kgreen@ee.rochester.edu

Thanks!

Kenton Green
Newsgroups: sci.electronics
From: hale@btree.uucp (Bob Hale)
Date: Mon, 31 Aug 92 19:57:48 GMT
Organization: Brooktree Corporation
Subject: Re: Computer on a car battery
Summary: 
Followup-To: 
Distribution: usa
Organization: Brooktree Corporation, San Diego
Keywords: 

In article <IISAKKIL.92Aug30164509@vipunen.hut.fi> iisakkil@vipunen.hut.fi (Mika Iisakkila) writes:
>
>All normal car batteries sold here have something like "60 Ah" printed
>in huge letters on the side. I have no idea of the load current for
>which this holds.

The standard for capacity rating is for a discharge current of 0.1C
for this type of battery.  Thus, 6 amps for 10 hours when the battery
is new and hasn't aged any.

However, a car battery is a lousy source for continuous drain or deep
draw applications; the life of the battery will be short.  For a
continuous draw application an RV house battery is a much better
choice.  These are intended to be run down to nearly discharged
without suffering unduly.  However, they are *not* good for starting
a car engine because their peak current capability is limited.

Bob Hale                                      ...!ucsd!btree!hale
...!btree!hale@ucsd.edu                       ...!ucsd!btree!hale@uunet.uu.net
From: wilson@MML.NCSL.NIST.GOV (Ron Wilson)
Newsgroups: sci.electronics
Subject: Need Antenna Help
Date: 31 Aug 92 19:37:24 GMT
Organization: National Institute of Standards and Technology (NIST)

Hi Netters,

I need some advice.  Lately it seems that I have had a lot of interference 
in the TV reception.  Most UHF stations get fuzzy and drift off and now 
it's even happening to some network channels.  It's like the TV is trying 
to pickup two channels at the same time.  I live on the outskirts of 
Washington, DC and use a Channelmaster antenna with an amplifier.  The 
antenna feeds directly into the amp which is located in the attic.  This 
has worked fine for about six months.  I have heard or read that amps are 
great for picking up signals.  Is there a filter or something I can put 
in the line that will take out these stray signals?  Do I need to put in 
new cable?  

You can email me at wilson@mml.ncsl.nist.gov or post to the net.  

I do not usually read this group, so I'm sorry if this subject has been 
beaten to death.  Thank you very much.

Ron Wilson
Newsgroups: sci.electronics
From: ragee@vdoe386.vak12ed.edu (Randy Agee)
Subject: Re: Resistor Colour Code Mnemonic
Organization: Virginia's Public Education Network (Richmond)
Distribution: ont
Date: Tue, 25 Aug 92 18:56:59 GMT

The one I learned was:
Bad Boys Rape Our Young Girls But Violet Gives Willingly......

_______________________________________
"If you do what you have always done, you can only expect to
get what you have always gotten!
________________________________________
Newsgroups: sci.electronics
From: riepe@ifwm11.ifw.uni-hannover.de (Michael Riepe)
Subject: Re: Filtering wind noise
Organization: University of Hannover, Germany - IFW
Date: Fri, 28 Aug 1992 03:04:26 GMT

In article <24875@castle.ed.ac.uk>, cam@castle.ed.ac.uk (Chris Malcolm) writes:
|> In article <dfAW02=71de601@JUTS.ccc.amdahl.com> drp40@cd.amdahl.com writes:
|> 
|> >I'd like to be able to use two-way radios for skydiving.  Problem
|> >is, 120mph of wind hitting up against a microphone would probably
|> >mask out any voices.  Anyone have any ideas of how to get around
|> >this?
|> 
|> 	1) A throat mike under clothing.
|> 
|> 	2) Use combined ear speaker/mike, inside substantial ear muff.
|> 	The voice gets to the ear via head transmission.

3) Use 2 mikes connected to a differential amplifier.

-- 
 Michael Riepe                         <riepe@ifwm11.ifw.uni-hannover.de>

     IIII  FFFFFFFF  WWWW           WWWW             Univerit"at Hannover
    IIII  FFFF       WWWW   WWW   WWWW    Institut f"ur Fertigungstechnik
   IIII  FFFFFFF     WWWW WWWWW WWWW       und spanende Werkzeugmaschinen
  IIII  FFFF         WWWWWW WWWWWW                   Schlosswender Str. 5
 IIII  FFFF          WWWW   WWWW              W-3000 Hannover 1 (Germany)
--
Newsgroups: sci.electronics
From: peterlew@bnr.ca (Peter Lew)
Subject: Re: Surround Sound Modes
Reply-To: peterlew@bnr.ca (Peter Lew)
Organization: Bell-Northern Research Ltd.
Distribution: na
Date: Tue, 01 Sep 92 18:12:01 GMT

In article <Btwq7I.E94@acsu.buffalo.edu>, v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:
|> 
|>   What is the difference in the surround sound modes on receivers like
|> Hall, Jazz, Stadium, Concert, Church and Club. Electronicall what is
|> the difference? Im using a surround processor kit in a receiver Im 
|> building. Its offered from Mark V electronics. It sounds decent but
|> mostly makes the sound echo and sound tinny. I want to know the differences
|> in each surround mode to try to copy it in my design my changing the
|> delay, effect and level for each type. I would appreciate any help.

I was under the impression that the various sound modes only affect the amount of delay (no special effects). The echo sound that you are getting is supposed to be there, however the tinny sound isn't. Usually I get unwanted highs (in the form of hissy noise) as a result of the bucket brigade introducing unwanted harmonics (inherent in the sampling of the bucket brigade). To remove the harmonics, I've adjusted the common mode signal rejection circuit and reduced the bandwidth of the output filters. 

Would you mind checking your circuit and letting me know if you find that your rear set of signals are fed from the same source? My rear speakers are both fed from the same point except that one of the speakers is phased 180 degrees from the other. So in reality the rear speakers are monophonic with phasing to give the illusion of separation.

Ciao

Peter Lew

.SIG under construction
Newsgroups: sci.electronics
From: weigand@pecan.cns.udel.edu (Steve Weigand)
Subject: Re: Filtering TV Commercials
Summary: no go. 
Organization: University of Delaware, Newark
Date: Thu, 3 Sep 1992 19:52:35 GMT

In article <10574@sun13.scri.fsu.edu> nall@sun8.scri.fsu.edu (John Nall) writes:
>In article <1992Sep03.042045.5095@ecst.csuchico.edu> rmintz@ecst.csuchico.edu (Rich Mintz) writes:
>>I'm interested in building a device (or making my 386sx 
>>act like one) that will be able to distinguish television 
>>commercials from television programs. I've talked to a 
>>few people and have heard of a couple of ways it is said 
>>that this can be done.
> 
>  ...
>
>>Any suggestions? Thanks.
>
>  No suggestions - but if you can come up with such a device, you
>  can probably make a lot of money with it.  (Assuming, of course,
>  that the advertising agencies do not have you done away with :-) )
>  Of course, you have to also have a mechanism for controlling
>  the TV sound with it.
>
>  I use the "mute" button on my remote, of course, as does everyone
>  else probably.  But this has the disadvantage of you still have
>  to look at the stupid picture, or else they'll switch back and
>  you'll miss the touchdown (or whatever).
>
>  John
>
>--
>John W. Nall              | Supercomputer Computations Research Institute
>nall@mailer.scri.fsu.edu  | Florida State University, Tallahassee, Florida
>  "Sugar and spice/and everything nice/blend it twice/add more spice/
>   Then serve over ice..." - original recipe for making southerners

This is an old concept... A device to filter commercials on T.V.. The problem
is that there is NO WAY to tell when a commercial appears. We had a rather
lengthy discussion on this news group about this idea last year. There were
many ideas passed back and forth, but in the end, no one came up with anything
that would work 100% of the time. 
 
The volume levels do not change during a commercial in any particular way.
There is no "coded signal" in a commercial that identifies it as such.
The pause between tv shows and commercials can be variable length (from as
little as a few tenths of a second to many seconds). Therefore, you can 
simply search for a pause. (TV shows have pauses in themselves of the same
type and length)
 
An idea was to have a computer listen to commercials and shut off if it hears
a commercial that was already played... Real-time computers can do this in
less than a few tenths of a second. However, you must record the ENTIRE
commercial onto a disk. You say, "so what? Just get a large disk drive." 
Okay, now the device has to register commercials that start in the middle
or stop abruptly. It's just too complicated.

I recommend getting cable.

- Steve Weigand
 (weigand@ee.udel.edu)

Newsgroups: sci.electronics
From: veit@du9ds3.uni-duisburg.de (Holger Veit)
Subject: Re: multi-standard VCR`S (Re: NTSC to PAL Did anyone try? )
Date:  2 Sep 92 15:28:27 GMT
Reply-To: veit@du9ds3.uni-duisburg.de
Organization: Uni-Duisburg FB9 Datenverarbeitung

In <1992Sep2.103956.14680@lmpsbbs.comm.mot.com> michaelr@ecs.comm.mot.com (Michael Roetzer) writes:

>In article <1992Sep2.023848.10324@iitmax.iit.edu> technews@iitmax.iit.edu (Kevin Kadow) writes:
>>In article <31AUG199217470293@robin.rp.csiro.au> awhichel@robin.rp.csiro.au (Adrian Whichello) writes:
>>)In article <28AUG199216305565@judy.uh.edu>, cscc13@judy.uh.edu (NAVEED IQBAL) writes...
>>)>Did anyone try converting NTSC to PAL system? 
>>
>>	The good news is that there ARE multi-standard VCR's which can play
>>PAL tapes, all can feed a monitor, and some are able to trick your _TV_ into
>>displaying an adequate image. The trouble comes when you try to record to a
>>NTSC VHS VCR.

>Where can you buy or mail order multi-standard VCR`s ?  And how much are they?
>Last year I asked in several electronics and video shops in Tucson, AZ about those VCR`s but they
>never heard of it.

>     Michael

At least here in Germany I once saw one, by Panasonic if I remember correctly.
This one was able to accept either standard PAL-BG/I/H/M, SECAM-France,
SECAM-"East", NTSC-50Hz and NTSC-60Hz and some other minor systems, 
according to the ad sheet. I am not sure about the internal format, but it has
been said to be a converter, i.e. emit the different standards as well (I 
don't have detailed technical data, not even the type ID, so don't ask me).
I was quite expensive, about 5000 DM, which is about 3300 USD (oh, i forgot,
now about 3600 USD ;-)

I'd guess that such a beast is available anywhere in world, although it will
not be requested very much in countries where there are no different concurrent
standards.

Also note, that there is a chip set by Philips named Multi-Standard-Colour
Decoder, which may automatically synchronizes SECAM-*, PAL-* and NTSC-50Hz 
(4.43 and 3.58 MHz carriers) to RGB. From RGB it is a quite simple step to 
go back to PAL and NTSC, by using a PAL/NTSC-Encoder named TPE1178 (also 
Philips?). These chip sets unfortunately do not convert the line frequencies.
The 10Hz difference usually need a dual port video memory, in a similiar
way to synchronize two *free running* video signals (Building a *genlock* with
one synchronizable source is much simpler).
If someone is interested in the converter chip set, I'll look up the part 
numbers. Send me mail, I don't read this group very often.

Holger

P.S.: I am not involved in video/TV business; I just bought a video-mixer kit
for some purposes, which had these circuits in it.

-- 
|  |   / Dr. Holger Veit         | INTERNET: veit@du9ds3.uni-duisburg.de
|__|  /  University of Duisburg  | BITNET: veit%du9ds3.uni-duisburg.de@UNIDO
|  | /   Dept. of Electr. Eng.   | "No, my programs are not BUGGY, these are
|  |/    Inst. f. Dataprocessing |          just unexpected FEATURES"
From: terry.walter@outlan.ersys.edmonton.ab.ca (Terry Walter) 
Newsgroups: sci.electronics
Subject: VIDEOCYPHER II/IIPLUS/RS
Date: 26 Aug 92 01:00:00 GMT
Reply-To: terry.walter@outlan.ersys.edmonton.ab.ca (Terry Walter) 
Distribution: world
Organization: Outland BBS-UUCP

is anyone into the satellite dish scene and knows anything about the
decoder board by GI.  The vCII/VCIIPLUS, and the VCII RS??
From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Surround Sound Modes
Date: 1 Sep 92 16:09:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


  What is the difference in the surround sound modes on receivers like
Hall, Jazz, Stadium, Concert, Church and Club. Electronicall what is
the difference? Im using a surround processor kit in a receiver Im 
building. Its offered from Mark V electronics. It sounds decent but
mostly makes the sound echo and sound tinny. I want to know the differences
in each surround mode to try to copy it in my design my changing the
delay, effect and level for each type. I would appreciate any help.
From: exumfox@exu.ericsson.se (Mike Fox)
Newsgroups: sci.electronics
Subject: Re: Speech chips
Date: 31 Aug 92 21:53:31 GMT
Reply-To: exumfox@exu.ericsson.se
Organization: Ericsson Network Systems

In article 92Aug31124936@europa.orion.adobe.com, freed@europa.orion.adobe.com (Alex Freed) writes:
> 
> Hi, 
> 
> A few years ago even the Radio Sh** used to carry some speech chips. Now that
> I need to play with one, I can't find them anywhere. The question is:
> Does anyone know a source of simple-minded chip capable of saying a few simple
> words like numbers and letters? I know one was discribe in a book I once read
> but I forgot which one. Thanks.


Digitalker - a 40 pin chip that comes with either 2 or 4 ROMs.
             The basic 2 ROM set is about 150 words and the
               extra 2 ROMs are more words.
             Easy to understand male voice.
             Easy to interface to a bus as well, just put the
               address of the word you want the IC to speak
               and strobe it. Another strobe out of the IC will
               happen when the word has been spoke.


I can think of Jameco off-hand that sell them. I think it was
kind of expensive ($25?) 1 800 831 4242
Newsgroups: sci.electronics
From: zben@ni.umd.edu (Charles B. Cranston)
Subject: Re: RS-232 Line Monitor???
Followup-To: sci.electronics
Organization: UM Home for the Terminally Analytical
Date: Fri, 4 Sep 1992 00:28:22 GMT

In article <geb1.715477196@Isis.MsState.Edu>,
geb1@ra.msstate.edu (Granville Barker) wrote:
 
> I am trying to build a RS-232 line monitor.  
> I want to connect it between two RS-232 devices, and have a wire comming 
> off that I can connect to another computer and monitor both sides of the
> conversation between the other two devices.  Ie.. a Plotter and a Computer.
> I need to see what is being transmited and received, I tried hooking 
> pins 2 and 3 to diodes, then connecting rx on the monitor computer to
> the other end of the diodes.  THe other 2 devices still communicate ok, but
> I never see anything on my monitor computer.  I am connecting ground.

I built something similar, but with an SPDT switch to select whether the
"monitor" was listening to the "terminal" or the "line".  Most of the
time you're only interested in one end of the conversation or the other.
Much of the time you are interested in both you can do the experiment
twice, once listening to one direction and again listening to the other.

When I need to see the relative timing I borrow the line monitor box from
our hardware people (multi thousand dollar box but using only 5% of its
capacity can monitor both sides of the line at once :-).

The only other general solution I can see is using a PC with two serial
ports, and doing the displaying of both sides in software.

BTW, the box I built had another SPDT switch that allowed substitution
of the "monitor"'s keyboard for that of the "terminal".  This came in
handy when the "terminal" (a macintosh) had crashed and I wanted to send
some command to the "line" (a mainframe).

zben@ni.umd.edu     -KA3ZDF