HDTenEightyP/NetNews huggingface dataset:
From: hampster@phys.ksu.edu (Kip J. Mussatt)
Newsgroups: sci.electronics
Subject: 68HC11E9
Date: 9 Nov 1992 05:55:18 GMT
Organization: Kansas State University
NNTP-Posting-Host: bohr.phys.ksu.edu

Question:
	What is a good proven way to hook up this chip in single chip
mode to do A/D conversions and spit out data via the serial port?  I 
have the data books, but little hints, and references would be neat to 
have.  If anyone has any suggestions or applications notes that I could
get copies of (I will pay for the copies) I would appreciate it.  Also, 
someone said this beast can run at 8MHz.  I thought ALL HC11's topped out
at 4MHz ? Is this correct?  Please E-Mail me any reponses/suggestions. 
Thanks in advance.

-Kip J. Mussatt

hampster@matt.ksu.edu   ||  hampster@bohr.phys.ksu.edu


--
----------------------------------------------------------------------------
"Minor incidents with funny rays can have serious consequences, Shredder!"

     								 -Krang
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: Crystal-controlled FM XMTR?
Date: 9 Nov 1992 16:45:33 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <1992Nov9.033136.28608@athena.cs.uga.edu> mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
>In article <1992Nov6.204019.6938@news.nd.edu> fdeck@dumpster.helios.nd.edu (francis deck) writes:
>>I've seen talk about one-chip FM transmitter circuits, but it
>>appears they are all slug-tuned and experience frequency drift.
>>Is there a simple circuit out there which is a monaural or
>>stereo (doesn't matter for my application) FM transmitter,
>>but which has a crystal timebase?  I'd imagine it'd use some
>>sort of PLL, but at 89 to 108 MHz, I'm lost.  Any help?
>
>Hmmm, there isn't, but there should be.  It's easy to "pull" a crystal
>by using a (modulated) variable capacitance across it.  To get enough
>deviation to be audible on an ordinary FM radio, you'd probably want to
>use a crystal at perhaps 1/27 the eventual frequency, and then triple
>it several times (thereby also tripling the deviation).

Yes, but you get lousy linearity this way.  For better linearity your best
bet is to generate your signal with a crystal oscillator, then phase modulate
it with a seperate stage.  You'll need to pre-emphasize the signal in order
to get flat frequency response.
--scott

Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Big Brother Radio Shack
Keywords: competition, free market, monopoly
Organization: AI Programs, University of Georgia, Athens
Date: Mon, 9 Nov 1992 03:35:24 GMT

In article <BxBzJK.BqK@news.udel.edu> bew@brahms.udel.edu (Ben Williams) writes:
>I've just read this thread containing 50+ complaints about Radio Shack.
>What I would like to know is:  Why do we have to shop at RS to get
>electronic supplies?  Why aren't there other electronic stores in
>competition with RS?  Well, maybe there are in your area (let me know)
>but where I live they are the only thing going.  And boy is that ever
>frustrating!  Aren't there laws about monopolies?

There is no law requiring other people to set up electronics stores, if
that's what you mean... 

Radio Shack has been surprisingly successful at something which other
companies did not think possible.  

Their main competition is mail-order in nature.  See the numerous ads in
Nuts & Volts or Popular Electronics, for a world _distinctly_ different
from Radio Shack.


-- 
:-  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: X1FT@VM1.CC.UAKRON.EDU
Subject: Re: Where can I get Burglar Alarm window tape?
Organization: The University of Akron
Date: Fri, 6 Nov 1992 01:59:43 GMT

Thanks to everyone who suggested Radio Shack (especially those who provided
the catalog number).  I had stopped by a Radio Shack and asked someone behind
a counter (maybe a manager - I don't know), who responded "I don't know where
you could find window alarm tape".  I returned with the catalog number, and
after checking, the response was "Oh, that tape, we're out, but we should have
some in next week".  Sheese!. . . .
                                              - Frank
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: chaser lights
Organization: Motorola Computer Group, Tempe, Az.
Distribution: usa
Date: Wed, 4 Nov 1992 15:10:22 GMT

In article <1992Oct31.222606.5830@mtu.edu> cmwolf@mtu.edu (christopher m. wolf) writes:
>schuch@phx.mcd.mot.com (John Schuch) writes:
>>In article <1992Oct22.143703.6299@sactoh0.sac.ca.us> jhp@sactoh0.sac.ca.us (Jim H. Puga) writes:
>>>I understand I missed an article about how to build chaser lights
>>
>>Build an oscillator with an LM555, connect to output to a 7493
>>TTL binary counter, connect the BCD output to a 74154 TTL BCD to
>>1 of 16 decoder, connect the outputs of the 74154 to solid state
>>relays starting with output 1, connect the first unused output
>>from the 74154 to the reset input of the 7493.
>>
>
>How about using SCRs or TRIACs instead of relays, much quieter when I built
>one.  (SCR/TRIAC + optoisolator for each output)

Agreed, and much cheaper to build.

John
From: grier@bnr.ca (Brian Grier)
Newsgroups: sci.electronics
Subject: Re: How to filter out EMI/RFI from TV signal
Keywords: TVI problems
Date: 5 Nov 92 20:29:45 GMT
Organization: Bell Northern Research

It depends on how the noise is getting to the TV

> Several appliances seem to introduce EMI/RFI to the TV signal, namely
> my CD players (portable and component), my PC (386DX), and the usual
> hair dryer, maicrowave, etc.  I'm interested in finding out what I can
> do to make the TV signal more pure.  Here are some observations:

If the interference is being transmitted via the airways then you are
probably in a bit of trouble. However is the noise is being transmitted
via the power lines you may be in luck. Try wrapping the power lines
from your CD player and TV around a toroid. Six or seven turns will
clean up most common mode noise. The toroids are available at Radio
Shack, and cost around $15 for a pack of four.

Brian, WS1S
Bell Northern Research
Research Triangle Park, NC
Newsgroups: sci.electronics
From: rg9538@ehsn2.cen.uiuc.edu (Ronald E Garnett)
Subject: Re: 68HC11 Floating Point Routines
Organization: University of Illinois at Urbana
Date: Sun, 8 Nov 1992 18:55:57 GMT

bomr@erich.triumf.ca (Rod Nussbaumer) writes:

>In article <BxDpBv.JyH@news.cso.uiuc.edu>, rg9538@ehsn2.cen.uiuc.edu (Ronald E Garnett) writes...
>> 
>> 
>>Help!  I'm looking for a library of assembly routines for floating point.
>>I don't have time to write them myself.  I have access to a C compiler

>	Motorola did have a BBS with a floating point library for
>	the 'HC11 a few years back.  Sorry I don't have the number
>	anymore.  Maybe someone else can provide that.  They also had
>	a few other useful 68HC11 things there.
>	Good luck.


Yes, I have called Motorolas BBS and rereived a file for the 6809 Floating point.   I relaize that there are some similarities between the two processors, but
there are also some differences.  I don't really have time to try and port
things.  I am using an Archimedes C compiler which doesn't do a fantastic job
with code size or reliability of the code.

Thanks anyway!

Newsgroups: sci.electronics
From: len@zipacna.uucp
Subject: Plotter pens ?
Organization: Zipicna - Salt Lake City Utah, USA
Date: Fri, 13 Nov 1992 19:59:46 GMT

	I am trying fo find a source for the etch resist plotter pens or the
resist ink ??


					Thanks

-- 
	  ***********************************************************
	  *                       Len Bayles                        *
	  *		   Innovative Systems Design                *
	  *                  Salt Lake City,  Utah                  *
	  *  uucp:  ..!uunet!caeco.slc.mentorg.com!neb!zipacna!len  *
	  ***********************************************************
From: jack@robotics (Jack Morrison)
Newsgroups: sci.electronics
Subject: Re: CCD camera questions
Date: 12 Nov 92 23:55:28 GMT
Reply-To: jack@robotics
Organization: Image Analysis Systems Group, JPL

>The first question deals with auto-focus.  It used to be that cam-corders
>that had auto-focus also had a lens that was visibly turning any time
>the distance to the focal object changed.  Now, with the new and even
>smaller cameras, you often don't see this.  Is the lens just smaller and
>internal or is some non-mechanical means used to focus. The manual to
>my new Sony cam-corder says something to the effect that the camera
>focuses by maximizing the difference in light intensity between adjacent
>pixels.  I guess this makes sense - a blury picuture would have the
>light more dispursed between pixels, and a sharp picture would have
>higher contrast between pixels.  If a non-mechanical method is used to
>focus, does anyone have any more details?

Maximizing contrast is how it *decides* when focus is best; it still (as far
as I know) needs to mechanically move lens elements to change focus. 
The moving element is probably just not the outer surface, as you suspected.

>The second CCD camera question deals with the CCD's response to IR.
>What is the response curve of a CCD camera?  How quickly does the CCD's
>sensitivity taper off as the frequency of the light drops below visible
>and into IR?   And how come I can see the IR on my monitor/view-finder?
>(try pointing your TV remote at the cam-corder).  My potential application
>is a pseudo-night-vision device.

It depends on the CCD used, and the optical filters in front of it that
make specific CCD elements sensitive to red, green, or blue. But as you've
observed, they do see some IR. Your monitor displays this signal as
visible image (TV remote IR LED's are actually pretty bright).

I have specs here for a Kodak mono CCD chip; the quantum efficiency (sensitivity)
peaks at 27% around 400nm (bluish), and drops off more or less linearly for
higher wavelengths: 16% at 550nm (green), 10% at 650 (red), but still at 3%
at 850nm (IR). The color version of the same chip has filters that peak around
425, 550, and 650nm; the blue and green ones drop below 1% +/-100nm of center,
but the red filter looks more like a high-pass.

As far as night-vision, all you can do is experiment. Find a bright non-visible
IR light source (no, LED's aren't *that* bright!) and see what the camcorder
can see. Good luck!
----
"How am I typing? Call 1-818-354-6508"               jack@robotics.jpl.nasa.gov
Jack Morrison/Jet Propulsion Lab/MS107-102 4800 Oak Grove Dr, Pasadena CA 91109
From: peny@ppc.lpc.ethz.ch (Peter Nyffeler ,x4399)
Newsgroups: sci.electronics
Subject: Re: beryllium copper
Date: 6 Nov 92 16:08:41 GMT
Reply-To: peny@ppc.lpc.ethz.ch
Organization: ETH-Zuerich, Physical-Chemistry-Lab. - Switzerland

Here what is in "Hazards in the chemical Laboratory" by L. Bretherick (3th edition 
1981) about Berryllium compounds.
VERY TOXIC BY INHALATION AND IN CONTACT WITH SKIN
IRRITATING TO RESPIRATORY SYSTEM
DANGER OF VERY SERIOUS IRREVERSIBLE EFFECTS

Prevent inhalation of dust. Prevent contact with eyes and skin. TLV 0.002mg/m-3
toxic effects:

Particles penetrating the skin through wonds and abrasions may cause local damages 
difficult to heal. Symptoms of poisoning, indicated by respiratory troubles or 
cyanosis, may develope within a week or after a latent periode of even several years.

	Peter Nyffeler
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: My TV is sort of broken
Date: Thu, 12 Nov 92 17:07:01 GMT
Reply-To: paula@nlbbs.UUCP
Distribution: world
Organization: The Electronics Workbench


In article <BxK4CI.Ios@inews.Intel.COM> crichmon@sedona.intel.com writes:
 >
 >         We have a Toshiba 19" color TV that had an accident.  It was
 > pushed off it's stand forwards and landed on it's face.  It fell about
 > 18".  The problem it had for a while was that of funny colors.
 The other problem is > that the picture brightness went away.
                           <><><><>><><><><>
        I've got one of them, too. Still have to give it a good whack
        about every six months.

        Long distance guess: The delay line is a device which delays the
        B&W signal while the color sig is being processed. The B&W sig
        is the brightness of the color picture. This probably got it's
        solder jarred loose.

        I may have the service manual. Send model number and I might be
        better able to direct you. Look for a component like "DL1". In
        Toshibas, I think it would be a little black "box", very narrow,
        standing on its side. About 1" high, 1.25" long.

        For the daring: wiggle it with a non conductive probe while
        watching the pix.

        Also possible, in view of the color problem - the little board
        on the end of the picture tube. Tap on that with GOOD
        insulation.

        Let me know if you need further by e-mail.

        
           Paula Stockholm              paula@nlbbs.UUCP        
          Cumberland, Maine          !nlbbs!paula@uunet.uu.net
From: DI3QC@CUNYVM.BITNET
Newsgroups: sci.electronics
Subject: Keypad interface to HC11
Date: 11 Nov 92 00:06:37 GMT
Organization: City University of New York/ University Computer Center


     I am planning to interface a keypad to the io lines of an hc11. Does anyon
e have any suggestions on connecting a keypad. I was planning to scan the keypa
d by driving one of the rows hi and testing the columns. I was planning on test
ing this every 20ms. How would I take care of debouncing etc. Any suggestions.



                                         Alex Jeannopoulos
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: Re: Big Brother Radio Shack
Date: 11 Nov 92 18:24:24 GMT
Organization: University of Pennsylvania, Mechanical Engineering

:I'm afraid
:that at "onesies", there's not enough profit to make selling components
:worthwhile unless you raise the price like RS does.
:

i suspect there's not much profit _even_ if you raise the price
like RS does.  My theory is that they maintain a minimal
parts selection for marketing purposes - set themselves
apart from SILO, etc so that they can sell over priced
clock radios.





--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
Newsgroups: sci.electronics
From: tom@cs.utah.edu (Tom Blockovich)
Subject: Re: VCR's and frame by frame
Date: 5 Nov 92 00:11:39 MST
Followup-To: sender
Keywords: Yes a Fischer model FVH-6600
Organization: University of Utah CS Dept

I have a Fischer VHS unit model FVH-6600 that has single frame advance.  It is 
probably 5 years old.  I don't know what they offer now, but I like this 
machine.

Tom
Tom@cs.utah.edu





Newsgroups: sci.electronics
From: remek@mamura.ee.mu.oz.au (Remek Lipinski)
Subject: VCR / TAPE Problems --- HELP !!!
Organization: Electrical and Electronic - University of Melbourne 
Date: Thu, 12 Nov 1992 22:44:48 GMT

Hello Netters,

		I have a bit of a broblem with my VCR, although I do not
know if the problem is with the VCR ot the tapes. I recenly purchased
a SVHS Panasonic VCR and a couple of months down the track it started 
recording with such a large ammont of noise there was almost no picture
left (PANIC). I took it to a service centre and described the problem to
them, and they agreed to take a look. In the mean time (during the time
that my new VCR was being serviced), my other VCR (an old model Sharp)
which has been very reliable over the years, develop an identical problem.
Coincidence? I did not think so. So I opened it up and found a lot of tape
material on the head, and after cleaning it everything was back to normal.
I then traced the tapes most likely responsible (as they were the only
ones I was using during that time), and found that it was my brand new
TDK EHG tapes which I purchased in a 2 pack. This led me to think that
perhaps TDK made a bad batch (as this is the first problem that I had with
TDKs), so I noted the batch code to make sure I do not get tapes from that
batch. My new VCR came back and the service person told me that there was
nothing wrong with it and that he cleaned the heads anyway. Relieved I thought
that my problem was solved. However, yersterday it returned, and I am using
TDK tapes with a different batch code.
	What I would like to desperately find out is whether it is likely
that TDK is making a lot of faulty tapes lately, or is it possible that my
new VCR somehow manages to lossen the surface of the tape so that magnetic
material is able to come off (as this would explain the same problem with
my older VCR). Please, any feedback would be grately appreciater.

Thanks in advance,
			Remek.
===============================================================================
** Remek Lipinski   :  remek@mullian.ee.mu.OZ.AU                              **
**                                              "I'll be back!"  - T800      **
===============================================================================
Newsgroups: sci.electronics
From: tgzhang@MtHolyoke.edu (Tian Ge Zhang)
Subject: an effective buffer for ASIC
Organization: Mount Holyoke College
X-Newsreader: Tin 1.1 PL5
Date: Sat, 7 Nov 1992 02:51:49 GMT



	Does anyone know a common buffer/driver that can connect between a
NOR latch and single LED display? The only thing I can come up with is
MM78C29, it can sink about 20mA which is what needed, but where can I
order it from? Any clue... I am ordering parts which will be used in the
layout I designed to play Tit Tat Toe game... Thank you.

Tian
tgzhang@mhc.bitnet


Newsgroups: sci.electronics
From: mgc@unislc.uucp (Marc Christensen)
Subject: Re: Autodialer
X-Newsreader: TIN [version 1.1 PL6]
Organization: Unisys Corporation SLC
Date: Fri, 6 Nov 1992 18:35:13 GMT

: some brands will also handle A,B,C,D codes like in a 12 digit pad.
:  
  Make that a 16 digit Pad. oops.

Marc Christensen

Newsgroups: sci.electronics
From: sysrick@starbase.spd.louisville.edu (Rick McTeague)
Subject: Re: CCD camera questions
Date: Fri, 13 Nov 1992 03:59:38 GMT
Organization: University of Louisville

In <1992Nov12.235528.2939@elroy.jpl.nasa.gov> jack@robotics (Jack Morrison) writes:

>>The second CCD camera question deals with the CCD's response to IR.
>>What is the response curve of a CCD camera?  How quickly does the CCD's
>>sensitivity taper off as the frequency of the light drops below visible
>>and into IR?   And how come I can see the IR on my monitor/view-finder?
>>(try pointing your TV remote at the cam-corder).  My potential application
>>is a pseudo-night-vision device.

>It depends on the CCD used, and the optical filters in front of it that
>make specific CCD elements sensitive to red, green, or blue. But as you've
>observed, they do see some IR. Your monitor displays this signal as
>visible image (TV remote IR LED's are actually pretty bright).

>As far as night-vision, all you can do is experiment. Find a bright non-visible
>IR light source (no, LED's aren't *that* bright!) and see what the camcorder
>can see. Good luck!

CCDs are reasonably sensitive to near IR at room temperature. Get them
cold (liquid nitrogen), and they're even more so; I have an astronomer
friend who uses cooled CCDs as his IR image sensors.

Camcorders have a filter (either a separate one or as a side-effect of 
the color filters used in color camcorders) which cuts out a lot of the IR.
Trivia note: of the three color filters, the blue one seems to be most
transparent, as an IR LED shows up as a bluish color (at least on my
camcorder). Not exactly what one would expect...

I have a Fisher Price PXL2000 kiddie camcorder (b&w) from which I've 
removed the IR filter, which was a tiny square of very light blue-green 
glass/plastic. It's now pretty sensitive to IR; I can go into a dark
room with an IR source and I can see my way around.

The IR source? I use a flashlight with one piece each of red, green, and
blue filter plastic on top of each other. That cuts out almost all of
the visible light, but it's almost transparent to IR (again, not what
you'd expect!), so you can barely see the flashlight with the naked
eye, but the CCD picks it up great! It's also surprising what you can
see with a TV remote control. I haven't yet tried it with an array of
LEDs.

My suggestion: find yourself a cheap b&w camera - I have a 3.5x2.5x1.0
inch camera I got at a hamfest for $125 - and see if it has an IR filter
you can remove. Hook it up to a camcorder video monitor, and you have an
IR viewer you can use with the above-mentioned flashlight setup.

Happy viewing,
Rick

-- 

Rick McTeague
Electrical Engineering Department, Speed Scientific School
University of Louisville, Louisville, KY 40292
(502) 588-7020

Internet: sysrick@starbase.spd.louisville.edu

Disclaimer: I'm a stand-up comedian; if anyone takes me seriously, I'm
            doing something wrong!
From: duff@cs.wisc.edu (Adam Duff)
Newsgroups: sci.electronics
Subject: Linear regulator circuits?
Keywords: linear, regulator, power
Date: 12 Nov 92 23:07:07 GMT
Reply-To: duff@phenom.physics.wisc.edu
Organization: University of Wisconsin-Madison, Department of Computer Sciences

Does anyone have any pointers toward good example circuits for
linear regulation?

I require a circuit with very low output impedance (say, a couple of
microOhms) from DC to at least 100kHz.  Actual voltage stability is
secondary.  Typical output voltages will be from 50 to 100 VDC.
Currents from 2 to 6 Amps.

Thanks in advance for any information,
Adam.
From: hleaves@gems.vcu.edu
Newsgroups: sci.electronics
Subject: RF leakage from TV cable system
Date: 8 Nov 92 01:30:33 GMT
Organization: Medical College of Virginia

I have some questions about RF leakage from a cable TV source:

1. Why does the cable company check for RF leakage? Is it merely to see who
is tapping their signal and not paying for it? Is it a health hazard? Or does
it cause interference to other TV's? 

2. How do they detect leakage? I'm suprised there is enough leakage from
a leaky system to be detectable. How much stray RF actually comes out of
the leaks?]

3. What is the best way to reduce RF leaks in a home cable system.

Thanks,
Hugh
-- 
*******************************************************************************
** Hugh L. Eaves                      ** Internet: hleaves@ruby.vcu.edu      **
** Medical College of Virginia        ** Bitnet: hleaves@vcuruby             **
** Department of Human Genetics       ** Voice: (804) 371-8754               **
***************** All non-incendiary communication welcome! *******************
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: beryllium copper
Organization: Motorola Computer Group, Tempe, Az.
Date: Thu, 5 Nov 1992 14:32:47 GMT

In article <118.UUL1.3#666@vortex.COM> lauren@vortex.COM (Lauren Weinstein) writes:
>Greetings.  While going through some socket specs the other day, I noticed
>that the contacts were spec'd as "beryllium copper".  Unless memory
>fails me, I seem to recall that beryllium is a horribly toxic substance,
>and extremely carcinogenic.  Is it completely safe in what I assume is
>a copper alloy?  Are there any special handling procedures necessary
>or advised for dealing with such an alloy?
>
>Thanks.
>
>--Lauren--

I remember in a machine shop class some time ago being told to avoid
the dust, but be very careful not to get stabbed or cut by the shavings
or sharp edges on beryllium copper. He said the wound would always
become infected and take a very long time to heal. Hear-say, but that's
what I was told.

John