HDTenEightyP/NetNews huggingface dataset:
From: wrb@cbnews.cb.att.com (wallace.r.blackburn)
Newsgroups: sci.electronics,comp.robotics
Subject: MC68HC11 questions
Keywords: 6811 motorola microcontroller
Date: 22 Dec 92 15:04:37 GMT
Followup-To: poster
Distribution: usa
Organization: AT&T

I have some pretty basic questions about EEPROM programming on the 6811.  

I have the technical data book on the 'E2, but it talks about programming
the EEPROM as if you already have the ability to execute code on the 6811.
How do you actually go about programming the EEPROM?  Do you need to use
the bootloader to load a program that downloads code and programs it into
EEPROM?  If so, are there already some programs available as freeware to do
this?

What about hardware setup for the programming?  Obviously you need to
provide a serial connection to the SCI on the 6811.  Does it come up with a
particular set of com parameters?

Could I use the Miniboard and some downloading software for the PC to
program similar parts such as the 'A1 (only 512 bytes EEPROM)?  B.G. Micro
has the 68HC11A1FN for $5.95.  Seems like a good price.  Motorola's books
say it has EEPROM (I thought EEPROM parts had 811 in the number).

Thanks in advance.


			Wally Blackburn AA8DX
Newsgroups: sci.electronics
From: mikolaje@ccrs.emr.ca (Ken Mikolajek)
Subject: Re: Wow, really BIG resistors....
Organization: Canada Centre for Remote Sensing, Ottawa
Distribution: global
Date: Tue, 22 Dec 1992 20:48:45 GMT

In article <1gag1gINNcvf@crcnis1.unl.edu> mpaul@unlinfo.unl.edu (marxhausen paul) writes:
>I finally got in touch with the right folks at Dale and got their full
>line catalog so I can find the 1 gigaohm resistor I need.  But hey, turns
>out that's nuthin'...they have resistors in values up to _100 teraohms_,
>that's, uh, 100,000,000,000,000 ohms. There are a few models where the
>_smallest_ value you can get is 10 Gohm.  
>
>Yikes.  What do these get used for?  Especially the 40 watt and larger
>models?????
> 
>--
>paul marxhausen .... ....... ............. ............ ............ .......... 
How about space! The final frontier :) where the "atmospheric"
impedance is less that 100 teraohms.  I don't think these
resistors/insulators would be of much use outside of a vacuum.

Ken.
From: bmw@isgtec.com (Bruce M. Walker)
Newsgroups: sci.electronics
Subject: Re: Vector wire pencils
Summary: there's better.
Date: 23 Dec 92 21:33:52 GMT
Organization: ISG Technologies Inc., Mississauga Ontario

In article <1992Dec21.152708.11873@kong.gsfc.nasa.gov> stephens@kong.gsfc.nasa.gov (mark stephens) writes:
> Are these useful?

Yes.  But not as useful as wire-wrap or Slit-N-Wrap.

> They are the "pencils" which wrap a wire around a post
> and you then solder it. [...]  Etching seems to be a tad
> much for (probably) one shot boards and wire wrapping might be overkill. 

For one-shot boards (largely for ICs), I've used:
- hand etched PC boards using India ink (hand-drawn on!) for resist
- hand etched PC boards using photo resist
- hand etched PC boards using silk-screened ink resist (from photo)
- Vector wiring pencil (P178-1)
- Vector Slit-N-Wrap pencil (P180)
- wire-wrap (tm Gardner Denver :-)

For reliability, I prefer wire-wrap 1st, then Slit-N-Wrap.  The wiring
pencil is well down the list.

I found that the wiring pencil was useful for a very compact board, but
you have to be very careful not to melt (a) the socket (b) too much
insulation along the wire.  The docs say "use a 750 degree tip" and
they mean it.  I used an 800 degree tip on my Weller temperature
controlled iron.  This is a bit silly: buy a $5 tool and you need to
use a $100 soldering iron with it.  It can be made to work though,
I built a complete CMOS microcomputer with it.

> With the pencil, do you need special posts for inserting into a perf
> board?

I always used solder-tail sockets that I epoxy'd down.  Alternatively,
I would scotch-tape the sockets in place, turn the board over and
solder all the Vcc and GND pins and remove the tape.  You can wire
directly to cut-off and bent component pins (resistors, etc).

But I'd forget all that.

I'd recommend a simple and cheap hand-wire-wrap tool if you just
have a small board (up to 25 ICs) to do.  These look like this:

             ____________
============|_____O______|=========

^                 ^                ^
|                 |                |
wrapping end    stripper     unwrapping end

(sorry about the ASCII pix)

... and take 30 gauge wire, and cost about $7 or so.  All the tools you
need are:  the above, a small side cutter (4"), needle-nose pliers (5")
and it's helpful to have a very small crochet hook to snag wires and
shove them around.  The cutters and pliers should be spring-opening if
you can get 'em.

Have fun!

--
"Eventually, I decided that thinking was not getting me very far and it
 was time to try building."           -- Rob Pike, The Text Editor sam
      bmw@isgtec.com   [ ...!uunet.ca!isgtec!bmw ]  Bruce Walker
Newsgroups: sci.electronics,misc.wanted
From: tom@cpac.washington.edu (Tom May)
Subject: Re: WANTED: Receiving tube manual...
Organization: Center for Process Analytical Chemistry, UW
Date: Tue, 22 Dec 1992 19:12:25 GMT

In article <1h7553INNjrk@fmsrl5.srl.ford.com> krouth@slee01.srl.ford.com (Kevin Routh) writes:

   I'd like to get a copy of an old receiving tube manual, maybe RCA.  If
   someone has one collecting dust, please e-mail me.  I really don't want
   to pay too much, however.  Thanks.

I found a 1961 RCA Receiving Tube Manual in the electronics section of
a used bookstore for a few bucks.  I wonder if having a more recent
one might be better - I'm interested in guitar tube amplifier hacking
and it doesn't cover a lot of the tubes that are used now.

Are there any new receiving tube manuals?  When was the RCA manual last
published?
--
Tom, aspiring tube amp hacker
Xref: sparky sci.electronics:21422 sci.energy:6373 rec.autos:30356
From: bg@ccwf.cc.utexas.edu (Brent Goodrick)
Newsgroups: sci.electronics
Subject: A Simple PSpice/Probe Question
Summary: Two data point plots from two different circuits
Date: 2 Jan 93 21:04:23 GMT
Organization: The University of Texas at Austin, Austin TX

Does anybody out there know how to tell Probe to plot two
or more different "rounds" of PSpice analysis data to the
same graph?  That is, I want to do the following:

   1.  Set up a PSpice textfile containing a circuit.
   2.  Run PSpice on the file to generate the Probe data
       for a specific voltage/current expression (like
       "db(v(6)/v(2))")
   3.  Then, I would want to exit Probe, edit the PSpice
       file, change a resistance value or some other value.
   4.  Now, I want to rerun PSpice on the updated textfile,
       but WITHOUT overwriting the data generated for Probe
       in the previous PSpice execution.
   5.  Now I would execute Probe, and somehow tell it to show
       me the plot of the voltage/current expression for
       the old and new circuits ON THE SAME PLOT.  The two
       or more traces would have to be traced in different
       colors.

I am sure that this is a very common question, so email your responses
to bg@ccwf.cc.utexas.edu.

Your responses are greatly appreciated,
Brent Goodrick
University of Texas at Austin
Electrical Engineering
From: bhiller@bigwpi.WPI.EDU (Brent Hiller)
Newsgroups: sci.electronics
Subject: 68HC705K1
Date: 30 Dec 1992 03:01:30 GMT
Organization: Worcester Polytechnic Institute
NNTP-Posting-Host: bigwpi.wpi.edu

I am looking for a source for the Motorola XC68HC705K1 8 bit microcontrollers.
Preferably the windowed version. I tried Active today and the lady I spoke
with could only find the evaluation board, not the individual chip. The
approx. cost of these chips would be appreciated also. Thanks is advance.

Brent Hiller

bhiller@wpi.wpi.edu
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Thu, 24 Dec 1992 16:24:06 GMT
Subject: Re: Digital tuning
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

>  I have a sony walkman with digital tuning. The tuning step is
> 10Khz for AM band. I want to take this to India where stations are at 9KHz
> steps. So in India I will be able to catch very few stations with
> this walkman. Can anybody suggest any method of changing
> the step frequency ? ( Some walkmans come with option, but
> mine does not ). Can I tap the line somewhere and introduce
> another synthesiser etc ?

I just bought a Sony w/digital tuning (unfortunately, I don't know the model
number), but I know that it has a switch to change the AM tuning step.
In mine, it's inside the cassette compartment, and hard to see unless you're
looking for it.  You might want to check your owner's manual, or just look
around the unit *really* well.

If there's no switch, there probably IS a jumper or some such inside - Sony
sells these things worldwide, and it'd be silly to have more than one basic
design for similar models.  Perhaps someone knows the innards well enough
to point the location of said jumper out?


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Newsgroups: sci.electronics,sci.energy,rec.autos
From: wayne@r-node.gts.org (Wayne)
Subject: Need circuit for switched 14 Mhz oscillator
Keywords: oscillator, switched
Organization: R-node Public Access UNIX Information System (416-249-5366)
Date: Wed, 23 Dec 1992 14:06:09 GMT

I'm working on a project that requires a switched 14 Mhz oscillator.
I am currently using a 14 Mhz crystal, a 1M feedback resistor and a
couple of capacitors on a 74HC00. My problem is that the oscillator
will occasionally either not start or oscillate at a higher harmonic.
When it does work the output is also pretty feeble so I know I'm doing
something wrong.

I would prefer not using a commercial canned oscillator because this
project is pretty cost sensitive. Anyone have any suggestions on what
I should be doing?

Even though I read this group often please email any responses as I will
be out of town for a while and most likely miss any posts because of the
short expiry time on this machine.
-- 
Wayne Dawe                    (pick a path, any path but don't send me
wayne@r-node.gts.org           anything bigger than 15k)
wayne@r-node.pci.on.ca
wayne@r-node.UUCP
Newsgroups: sci.electronics
From: Ed_Meyer@mindlink.bc.ca (Ed Meyer)
Subject: Re: Flywheel Batteries (Pop.Sc.)
Organization: MIND LINK! - British Columbia, Canada
Date: Thu, 24 Dec 1992 07:31:43 GMT

An article on page 27 of the January issue of Popular Science mentions that
American Flywheel Systems (AFS) have designed a counter-rotating
magnetic-bearing flywheel battery.  The wheel design is of the "rim wheel"
type.  Here are a few excerpts from that article:
     "The rim of each is made from a high-tensile-strength fiber, such as
      Kevlar."
...  "To power a car, a flywheel battery must be capable of rotating at
      150,000 to 200,000 rpm."
...  "Furia says his new battery could make GM's proposed Impact electric
      car go as far as 600 miles on an overnight charge.  The Impact now
      runs on 32 lead-acid batteries and has a range of about 80 miles.
      Replacing the lead-acid batteries with 20 flywheel batteries, each
      weighing 30 pounds, would also improve the car's acceleration,
      according to Furia."
...  "It's very important to overcome the perception of electric cars as
      glorified golf carts or greenmobiles."
...  "The flywheel battery would last about ten time longer than a lead-acid
      battery --- which must be replaced after 25,000 miles.  And since it
      uses no chemicals, it wouldn't create corrosion or disposal problems."
...  "For now, the flywheel battery exists only as a computer simulation.  It
      will take about two years to build a prototype for a car, ..."

Draw from the article what you will.  I know that I like the non-polluting
concept of an electric car, but 25,000 (or so) for a battery swap is not even
appeal at all to me.  Further, an 80 mile limit is too limiting for me: what
if I suddenly have an urgent or emergency situation and have to "plug-in"?
Now, 600 miles is more like it: I don't have to trot-out the charger every
night; I can drive around more or less like I do at present.

Well, that's my "2-cents" worth...
     Ed Meyer

Newsgroups: sci.electronics
From: anto@sol.acs.unt.edu (Anto Prijosoesilo)
Subject: Looking for MC68HC811E2FN sources
Keywords: MC68HC811E2FN HC11
Organization: University of North Texas
Distribution: na
Date: Wed, 30 Dec 1992 20:09:37 GMT

Can anybody tell me where I can get that part anywhere in the US?
I called Motorola and they gave me a list of dealers in my area (Dallas, TX)
but none of them have it in stock. Hallmark claimed that they won't get any
until late '93. A second call to Motorola, the guy told me that he can't 
even give me dealers' names (he doesn't know.)

I'm looking for 2 of these and possibly the MC68HC24 PRUs also. If the
design works, I'll get at least 25 more in the next 2 months, so a well
stocked source would help.

Please reply by e-mail to reduce bandwidth and I'll summarize to s.e.

Thanks a lot in advance.
From: albrecht@csd4.csd.uwm.edu (Chad Edward Albrecht)
Newsgroups: sci.electronics
Subject: Re: need some basic help with DIODES
Date: 31 Dec 1992 16:34:51 GMT
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4


A diode:


			|\ |
		--------| )|---------
			|/ |

		ANODE		CATHODE

		(+)		(-)

This is commonly considered "forward bias"

--
>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
|  Respond to any of these adresses:    |  "Oh Lord...Ooooh you are so big..,|
|  --------------------------------	| So absolutely huge.  So ab - sol-  |
|  albrecht@csd4.csd.uwm.edu            | utely huge.  Gosh, we're all really|
|  albrecht@convex.csd.uwm.edu		| impressed down here I can tell you!|
|  acct146@carroll1.cc.edu		| --Monty Python: The Meaning of Life|
|============================================================================|
|  UWM-CSD UNIX/MICRO CONSULTANT  Phn# (414) 229-5370 [standard disclaimer]  | 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
From: baden@sys6626.bison.mb.ca (baden de bari)
Newsgroups: sci.electronics
Subject: Re: Telephone Headsets
Date: Mon, 21 Dec 92 19:57:21 CST
Organization: System 6626 BBS, Winnipeg Manitoba Canada

lenny@hobbs.hunt.inmet.com (Lenny Goodman) writes:

> I've been looking into telephone headsets (the things that telephone
> operators usually wear) and the prices are much higher than I expected:
> $160 - $200 and UP.  Basically, the thing consists of half a headphone,
> a microphone, and a small amplifier.  I would have thought that the price
> would be $60 to $80.  Does anyone know why they are so expensive; or,
> does anyone know a source where the price is more reasonable??  Thanks.
> 
>   -- Len

 
        I actually do spend quite a bit of time on the phone, and thought 
of this problem as well.  What I did was connect a stereo jack to the 
phone (now implanted into the hand-set part of the phone).  THe 
connections are quite simple... and all I did then was take a stereo 
ear-phone set and disconnect one of the earphones, and connect an 
electret condensor to it.  The thing resembles a telephone headset, and 
is completely hands free...
 
                        just a suggestion.
        >>Baden<<
Xref: sparky sci.electronics:21767 sci.energy:6515 rec.autos.tech:17284
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 30 Dec 1992 23:41:30 GMT
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <30DEC199200153934@pierre.mit.edu> chuck@pierre.mit.edu (Chuck Parsons) writes:

	{first point: hypothetical flywheel is more efficient than
a heat engine, approximately three times less energy required}

	Good point.  Not quite enough orders of magnitude
to please me (0.5 versus 2), but good point.

>  Second mechanical strength of materials is _not_ greater than the
>strength of the chemical bonds forming the material. 
>Consider a thin hoop flywheel. Any flywheel can be thought of as being made
>up of many such hoops. Let the hoop have a fixed cross-sectional area A
>and the average mass of each atom in the material be M.
>
>  The energy stored in each atom of the hoop is E=.5 M*V**2.
>
>  When the hoop spins it tries to pull itself apart. It requires
>  on the order of .25*M*V**2/R  _per_ atom  of force to keep the loop intact.
>
>  The number of atoms in a loop is 2*pi*R/D where D is the spacing between
>atoms. Thus the force required is on the order of
>
>      .25*M*V**2/R  * 2*pi*R/D = .5*pi*M*V**2/D
>
>
>   Which is about 3*E/D! but if E is greater than about 1/3 the
>chemical binding energy then the molecules/material will come apart,
>because enrgy = force * distance
>
>   Since for really bitchin materials the heat of vaporization
>is similar the the binding energy, and because real materials have
>defects and fall apart well before the strain (or is it stress)
>aproaches the atomic limit. The flywheel will at _most_ have
>enough energy to vaporize itself

	Not a reasonable expectation, though, that in a FAULT
the failure will always deliver exactly equal strain energy
to all molecules in the whole danged flywheel.  A sensible 
scenario is NOT going to be so obliging: a crack will
develop, a fragment will whizz off (and through the 
containment), then the remainder of the rotor will shake
itself apart.  Not in molecule-sized pieces, but in large
ballistic chunks.  Maybe large enough to have a THOUSAND
molecules in a single fragment.

	That means that the energy absorption in bond 
breaking will be roughly in the ratio of volume/area of 
the one-atom and thousand-atom fragments.  This makes
90% of the energy of the rotor available to do damage.

	If you want to get back the energy in the rotor,
you'll have to argue why no chunks come off it, only
individual molecules.  And, if the chunks that come off
are LARGE, like bits of visible fluff, it's gonna
be multibillion atom fragments that one must figure on.
With a billion atoms in the chunk, the bond energy can
only take 0.1% of the energy you need to absorb.

	John Whitmore


Newsgroups: sci.electronics,sci.energy,rec.autos
From: marcm@marcm.mentorg.com (Marc Minato)
Subject: Re: MC68xxxxx Evaluation Kits?
Date: Wed, 23 Dec 1992 00:04:40 GMT
Organization: mentor
Keywords: 
Followup-To: 

In article <1992Dec22.154005.4885@synapse.bms.com>, gopstein@helix.bms.com (Rich Gopstein) writes:
|> 
|> I have the MC68HC705KICS evaluation kit, but I'm looking for a more powerful
|> Motorola microprocessor.  What kits are available, and what are the approximate
|> prices?  Thanks!
|> 
|> -- 
|> Rich Gopstein
|> 
|> gopstein@bms.com
|> rutgers!bms.com!gopstein

About two years ago Motorola was marketing a 68332 EVB/EVC/EVM system.  It consisted of a
small Business Card Computer (BCC) style/size circuit board with the 68332 microcontroller, some
ROM and RAM (about 128 KB I think.)  The 68332 is a 32-bit microcontroller with a MC68020 core
and some peripheral support functions, such as timers and I/O control.  I believe the processer
runs at or about 16 MHz.

At the time Motorola was marketing this to Colleges and Universities the price was in the $200-
$300 range.  However, the "regular" price was something like double that.

A classmate of mine bought one, and if it wasn't for a lack of cash, I would have picked one
up also.  It looked like a nice little package that had some horsepower in it.  

Maybe someone from Motorola can confirm whether this board is still available?????


Hope this helps.
From: mpaul@unlinfo.unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: Russian electrical therapy
Date: 2 Jan 1993 19:30:43 GMT
Organization: University of Nebraska--Lincoln	
Distribution: global
NNTP-Posting-Host: unlinfo.unl.edu

A recent "Nova" segment depicted Russian physicians trickling electrical
current into electrodes on the eyelids or foreheads of patients being
treated for alcohol abuse.  This treatment allegedly produces pleasant
sensations to substitute for the sensation of drinking.  I've also heard
before of Russian scientists using similar methods to induce slumber.

Is this a 100% crock?  What is supposed to be going on here?  Are they
running current between the cranial electrodes or from them to body
ground?  What order of magnitude is the current?  (Sub-microamp, I hope!)
AC or DC?

I'm NOT about to experiment with this, so save your cautions, I'm just
curious.  After designing, building and testing EMG preamps I have a
real healthy respect for the amazing shocks you can get even from tiny
currents, if there's a good electrode contact to the skin.  Not interested
in making my own home-brew self-lobotomy generator.

--
paul marxhausen .... ....... ............. ............ ............ .......... 
 .. . .  . . . university of nebraska - lincoln .  . . .. . .  .. . . . . . . .
 .     .    .  .   .     .   .  .    .   .  .   .    .   .  grace .   .    .  . 
   .         .       .      .        .        .      .        .   happens .     
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: 110/220 V AC why ?
Date: Tue, 29 Dec 1992 20:52:05 GMT
Organization: U of Toronto Zoology

In article <1992Dec29.160117.12068@cbfsb.cb.att.com> medha@cbnewsg.cb.att.com (keshav.havnurkar) writes:
>  I am curious to know why some countries have 110V AC supply
>and some 220V AC as their main line voltage ?

Historical accident, mostly.  As others have pointed out, there are other
voltages in use too.  The higher voltages have both advantages and
disadvantages, and electrical power systems evolved in parallel so there
wasn't a single pioneer that everyone else followed.

>... Is there
>any talk of standardizing this like SI syatem of measurement ?

Not a prayer.  The costs of switching would be astronomical, all the more
so because you can't convert one appliance at a time.  The benefits don't
justify the pain.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry