HDTenEightyP/NetNews huggingface dataset:
From: byron@cc.gatech.edu (Byron A Jeff)
Subject: Re: new PIC microcontroller
Reply-To: byron@cc.gatech.edu (Byron A Jeff)
Organization: Georgia Institute of Technology
Date: Mon, 12 Oct 1992 22:44:23 GMT

In article <1992Oct12.185657.23011@ntg.com> dplatt@ntg.com (Dave Platt) writes:
>In article <BvvAw9.31@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
>
>>The real question is:  are the programming specs in the datasheet?
>>
>> [Dave relays a Mircochip rep statment that programming specs are available
>>  upon request]

This seems to be true enough. As fast as I could hang up my modem and call
Microchip (602-963-7373) I was told that was exactly the case and was routed
to the local sales office (Hi Barbara!). I'll be picking up the specs
for the 16C5X series tomorrow morning. Now I'll have a complete set of
PIC and 68HC705 series development tools.

BTW the Parallax BBS has the PIC assembler and some software available for
download for the cost of the phone call. The number is 916-721-9607.

Since no non disclosure was involved I assume that I could share the info.
I'll do it the same was Microchip is: available upon request. However don't
send mail yet because I don't have them yet, they won't be in electronic form,
and I don't need my mailbox swamped. I a couple of days I'll post the process
of getting the specs. Fair enough?

Hope this helps.

BAJ
---
Another random extraction from the mental bit stream of...
Byron A. Jeff - PhD student operating in parallel!
Georgia Tech, Atlanta GA 30332   Internet: byron@cc.gatech.edu
From: pauls@trsvax.tandy.com
Date: 12 Oct 92 17:04 CDT
Newsgroups: sci.electronics
Subject: Re: CD Player filtering
Message-ID: <288200019@trsvax>
Nf-ID: #R:<1b2vpbINN78q@usenet.INS.CWRU.Ed:-34:trsvax:288200019:000:1071
Nf-From: trsvax.tandy.com!pauls    Oct 12 17:04:00 1992


easy enough.....

1) Trace back from the Line Out jacks.
2) Stop when you hit the DAC.
3) It's in between.

Expounding....

1) Early, cheesy players used MuRata thick film hybrid filter networks, or
if they were REALLY cheesy, a Sumida passive LC filter. Both are usually
shown as a rectangle on the schematic (kind of like a 7805 voltage
regulator is drawn). So, if all you see is a "mystery block" right by the
Line Out jacks, that's IT!

2) Later players used op amp filters. Most are 3 pole filters. If you have
a Philips/Magnovox player, they use a LC op amp filter (that's right,
there's a CHOKE in there!!). Others use a Sallen-Key RC filter, with a
passive RC on the front end.

3) Also look for the de-emphasis network. This is usually 2 resistors in
series and a cap to groung. A transistor (sometimes hooked-up 'backwards in
reverse alpha mode') shorts across on of the resistors. Sometimes in better
players this is in the feedback loop of an op amp.

4) Popular DAC used - PCMxx (ie PCM54, PCM69, etc), LC7881/LC7883, AD18xx,
and TDA73xx.

Hope this helps.
From: sehari@iastate.edu (Babak Sehari)
Newsgroups: sci.electronics
Subject: Re: Positive and negative side of diode
Date: 9 Oct 92 18:43:45 GMT
Article-I.D.: vincent1.sehari.718656225
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Originator: sehari@vincent1.iastate.edu

In <1b2pfuINN2rn@usenet.INS.CWRU.Edu> ah335@cleveland.Freenet.Edu (Richard Banks) writes:


>Please excuse my ignorance but I'm new at this.
>I'm putting together an electronic circuit and would like to know
>which side is positive and which is negative.  I guessed that the side
>which the ring on it is negative.  Is that right?  Please respond as
>quickly as possible and when I get a reply I'll cancel this article
>thanks.

      __________
------| ||     |-------
      ----------
    -            +
        
--------|<|-------
    -       +
 
                  With highest regards,
                       Babak   Sehari.
          
-- 
Newsgroups: sci.electronics
From: huey@athena.mit.edu (Huy Le)
Subject: Re: Student version of SPICE???
Organization: Massachusetts Institute of Technology
Date: Sun, 11 Oct 1992 19:41:23 GMT

In article <1992Oct9.143138.203047@uctvax.uct.ac.za>, clrmic08@uctvax.uct.ac.za writes:
|> Is there a student or demo version of SPICE around. If so where can I get 
|> a copy from ? An FTP site would be the most convenient. 
|> Thanks
|> Mike


I know the company MicroSims in California does send out free demo
copies of Spice, but I dont have their address off hand.


HL
From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: I need a good drawing program to make pc boards
Date: 10 Oct 92 19:00:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 I am sick of pc cad programs. Some like padsdemo are too complicated
for my uses and programs like pc-trace are too simple and are
terrible. I decided I want to make my pc boards the way I used to.
Drawing them on graph paper using rub ons. But I can do that on a 
computer also. I just need a good drawing program that I can define
chips and pads as macros. I also need a program that uses coordinates
and allows you to scale. And of course it has to be able to make
good printouts on a laser or 24-pin printer. I dont need a cad
program to autoroute. For my designs the human brain does a better
job. Is there a program out there that will help me? Thanks
in advance for any help. I am also experimenting with a new way to
etch pc boards. It includes printing your designs on a special piece
of paper coated with a thin layer of copper. You then peel off the copper.
It still has some adhesive left and you attach it to your board and
etch. It is still in its experimental stage. But by results are getting
better.

		Neil Gandler
From: mkl@nw.com (Mark Lottor)
Newsgroups: sci.electronics
Subject: new PIC microcontroller
Date: 7 Oct 1992 14:34:49 -0500
Organization: UTexas Mail-to-News Gateway
NNTP-Posting-Host: cs.utexas.edu

Microchip just announced a new version of the PIC, the PIC16C71.  Its
basically a super-upgraded version of the 18-pin 16C56.  Has a built-in
four channel 8-bit A/D converter, runs on 3-6v, has 1K (14-bit) program
memory, 36 registers, 12 special-function registers, 8 level hardware
stack (and they eliminated the silly page mode problems), and 13 I/O
lines.  The A/D can be disabled (uses port A).

An interrupt is available on the RTCC input.  New sleep modes exists and
wakeups can occur after an A/D conversion completion (20us), or when any
of 4 bits of port B change state.  Also, wakeup now continues with the
next instruction instead of jumping back to 0 (the new reset vector too).

The chip can also can be programmed over a two-wire serial line.  It
appears to be a single part that you can program for different oscillator
options, unlike now where you have to buy 1 of 4 different parts.

Parallax supposedly has a $99 upgrade to their programmer for the chip
but I haven't called them yet.  Microchip says it will ship in quantity
in November, probably long before you get your obsolete 16-pin Motorola
micros.  They also said a new version of the PIC will come out by the end
of the year, and it will have EEPROM program memory.

-mkl
Newsgroups: sci.electronics
From: deanr@sco.COM (Dean Reece)
Subject: Suggestions for recorded audio control devices?
Organization: The Santa Cruz Operation, Inc.
Date: Mon, 12 Oct 1992 20:25:46 GMT
Followup-To: sci.electronics
Keywords: DTMF MODEM Audio Recorded Control


Hi All,

I'm trying to put together some cheap special effects for a Haunted House
and I'd like some advice.  I want to build a device that takes one audio
channel from a typical jam box and use it to control relays (the other
channel will be going to a speaker).

I have considered using DTMF or an old 300 baud Modem, but I'd have to
experiment with either of these before I had a working system (and time
is short).  I'm hoping that some of you have done this before and can
give me pointers.

Additional info:
 Tape: Stereo Endless Loop (30, 40, or 60 sec)
 Recording Deck:  Stereo deck with Line-in or Mic-in.
 Playback Deck:   Portable stereo with Amplified Speaker outputs only
 Control Channels: 2 binary, none analog... more would be better.
 Budget: Minimal (Less than $100, more like $25)
 Time: must be done by 10/22/92

As for DTMF, I've got a box that produces DTMF tones to a line level
output, so the easy half is taken care of - I've never used a DTMF
decoder chip, so I'm not sure how level sensitive they are, etc... 
Also, hooking the speaker output to a decoder chip will require some
attenuation and perhaps filtering.  The advantage of DTMF is that it
gives me 4 bits of data without extra components.

As for Modem, I've got a Radio Shack DC-1 (0-600 baud Direct Connect).
I know the modem works, but I'm not sure how to convert the DAA to line
level for recording. As for playback, I could most likely couple the
modem and the stereo through a 8:500 ohm audio transformer.  With the
modem, I only get 1 bit of info unless I add shift logic, in which case
I trade sample rate for channels, though I could get hundreds of channels
before this becomes a problem.

Any suggestions or chip recommendations would be appreciated.

-Dean Reece (deanr@sco.com)
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Thu, 8 Oct 1992 17:06:05 GMT
Subject: Re: Can despiking caps be connected to a central ground?
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

>     The answer is THEY must go between VCC and GROUND on the SAME
>     chip.  The reason for a despiking cap is the momentary
>     current rush caused by switching in DRAMs and some other
>     chips.  The cap supplies the current needing for these chips
>     and prevents them from degrading the powersupply.  By
>     placeing them not Immediatly to the chips ground you are
>     totally defeating thier purpose.
> 

No, they do NOT need to go on the same IC if that means longer cap leads
than simply tying to the nearest ground point.  Assuming a board with
power/ground planes, or a power/ground "grid" as Henry mentioned (easily
"do-able" on a wire-wrap board, this may mean that the caps tie to power and
ground *between* adjacent ICs.  Distributing the capacitance across the
power plane is the key, not tying the caps to a given chip.


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.
From: kupiec@hp800.lasalle.edu (Bob Kupiec)
Newsgroups: sci.electronics
Subject: Blacklight SOURCE wanted!
Date: 15 Oct 92 16:21:01 GMT
Organization: LaSalle University, Philadelphia, PA

Does anyone know a local or mail order source for Blacklight
tubes? (I think that is the correct term for the light that
looks violet and makes white items shine brightly.  If not,
then what is?)

I'm looking for 12" stick bulbs (like standard forescent).
Also, what is the price range of these bulbs?  Are they
very expensive?

-- 
\/\  Bob Kupiec - Amateur Radio: N3MML   UUCP: (My machine is down,  )   /\/\/
/\/\   Internet: kupiec@hp800.lasalle.edu      (use INTERNET address.)  /\/\/\
\/\/\    LaSalle University, 20th St. & Olney Ave., Philadelphia, PA   /\/\/\/
/\/\/\     Self-Quote: "I'm MS-DOS free: never had it, never will."   /\/\/\/\
From: system@hale.cts.com (System Administration)
Newsgroups: sci.electronics
Subject: Re: signal generator CD
Date: Thu, 08 Oct 92 18:53:41 PDT
Organization: Hale Telecommunications San Diego CA

reiner@medusa.bioc.aecom.yu.edu (Peter D. Reiner) writes:

> Is there a CD with different-frequency sine waves on the various cuts?
> I'd like a signal generator but don't want to spend the money!
> 
> -Peter Reiner


I know MarkerTek has one, donno the price and the catalog is not handy.

BTW-  They sell studio and production equipment.

I'll get their info and post it, or try 800 directory assistance.


             -=-  System Administrator  system@hale.cts.com  -=-
                      Hale Telecommunications, San Diego
Newsgroups: sci.electronics
From: mark@wdcwdc.sps.mot.com (Mark Shaw)
Subject: Re: Motorola Literature Phone #?
Keywords: motorola microcontroller
Organization: Motorola Western MCU Design Center, Chandler Arizona
Distribution: usa
Date: Thu, 8 Oct 1992 20:32:38 GMT

In article <1992Oct8.122352.28979@cbnews.cb.att.com>, wrb@cbnews.cb.att.com (wallace.r.blackburn) writes:
|> Anyody know the number for Motorola's literature distribution?  I've lost
|> it and need to give them a call.  Thanks.
|> 
|> 
|> 			Wally Blackburn AA8DX
|> 			wrb@ccsitn.att.com


Try (602) 994-6561

Motorola Literature Distribution
P.O. Box 20912
Phoenix, AZ 85036
From: MATGBB@LURE.LATROBE.EDU.AU (BYRNES,Graham)
Newsgroups: sci.electronics
Subject: Re: electron orbitals
Date: 13 Oct 92 01:37:52 GMT
Organization: La Trobe University
X-News-Reader: VMS NEWS 1.24

In <gate.PiigsB1w165w@toz.buffalo.ny.us> cyberman@toz.buffalo.ny.us writes:

> 
>     This is a good question for a phyisics newsgroup.  I would
>     explain it but unless you've had Differential Equations and
>     several years of calculoous it would appear a shear gibberish
>     to you.  It's not very simple unfortunately.  It also has a
>     bit to do with chaos theory.
> 
>             Stephen Cyberman@Toz.Buffalo.NY.US
Ummm, I did the several years of calculus, and I know the orbitals come
from the different solution modes of the Schrodinger equation solved
for spherical symmetry (ie spherical harmonics, Legendre poly's and all that).
But what does it have to do with Chaos? My understanding was that all linear
DE's were non-chaotic. In fact, if the solutions were highly divergent
(chaotic), surely there would be no eigenmodes, hence no well defined orbitals?

>             Scripted at Sat  10-10-1992  16:09:01
> 
> ... Rubber bands are hazardous to pets if swallowed.
> --- Blue Wave/QWK v2.10
My cat LOVES rubber bands...
>                                                                                                              
Graham B
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: C Cross Complier for 68HC11
Date: 15 Oct 1992 16:41:29 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <1992Oct14.170149.6954@ntg.com> dplatt@ntg.com (Dave Platt) writes:
>>P S.  I've always wondered if they had a way to use GNU's
>>gcc as a cross compiler for embedded systems
>
>Try calling the folks at Cygnus Support (the people who provide
>commercial-grade support for GNU tools, at a reasonable price) at 
>+1 415 322 3811.  When I spoke with Rob Savoye at the Embedded Systems
>Conference a few weeks ago, I mentioned that I'd love to see gcc for the
>8051 family;  he replied that a lot of the work needed to put gcc on
>smaller-than-32-bit machines had already been done as part of another
>project, and that it probably wouldn't be too hard to retarget the
>compiler to produce code for embedded controllers.  All it'd take is
>money, from some customer who wanted to pay Cygnus to finish the port.

It's not hard, but the code that it generates isn't all that good.  I have
seen the code produced by the Z-80 backend, and it's anything but clean.
There are a lot of 32-bit dependancies in the compiler design which makes
for rather inelegant 8-bit backends.

While it's not impossible, and it might even be desireably from the standpoint
of having the same compiler on all platforms, it's not the most efficient
way to go.  And, with most embedded systems (especially 8-bit boxes), 
efficiency is an important issue.

Now, if you want an embedded 68020 in a system, gcc is definitely the way
to go....
--scott
Newsgroups: sci.electronics
From: luckey@rtfm.mlb.fl.us (Jon Luckey)
Subject: Re: C Cross Complier for 68HC11 
Organization: We don't need no stinkin' batches!
Date: Mon, 12 Oct 1992 06:59:39 GMT

P S.  I've always wondered if they had a way to use GNU's
gcc as a cross compiler for embedded systems

Newsgroups: sci.electronics
From: tgzhang@MtHolyoke.edu (Tian Ge Zhang)
Subject: Magic cell library
Organization: Mount Holyoke College
X-Newsreader: Tin 1.1 PL5
Date: Fri, 16 Oct 1992 22:38:55 GMT


Hi,   I wonder if  you have a clue about this:

		Do you know if there is a ftp place that one can get the
		layout for the basic cells such as NAND or NOR gates which
		are the building blocks for Magic cells, the ones we have
		in the system here are for tutoring purpose, so I suppose
		they are not much of use.

Thanks. 
tgzhang@mhc.bitnet

Newsgroups: sci.electronics
From: jeroen@dxcern.cern.ch (Jeroen Belleman)
Subject: Re: 25 ohm coax cable
Keywords: coax cable
Organization: CERN European Laboratory for Particle Physics
Date: Fri, 9 Oct 1992 13:28:29 GMT

In article <1992Oct8.120225.6247@fys.ruu.nl> vreeburg@fys.ruu.nl (Jurriaan Vreeburg) writes:
>
>I think that putting two cables in parallel doesn't change the impedance, since
>the impedance is defined as:
>
>                   L
>Z = square_root ( --- )
>                   C
>L: inductance per unit length
>C: capacitance per unit length
>
>What happens if we put two cables in parallel: both the inductance and the capacitance
>increase by a factor of two -> Z doesn't change!!! Putting two cables in series doesn't
>change the impedance as well, since L & C are defined per unit length, which don't
>change at all in that case.
>
>Jurriaan Vreeburg                             email: vreeburg@fys.ruu.nl
>Department of Physics and Astronomy           tel.:  (+31)-(0)30-534566
>P.O. Box 80.000
>3508 TA  Utrecht  Holland


But Z DOES change! In fact the C is doubled, while the L is halved,
so the quotient is 4 times as small. Ergo, Z is halved. Two 50 Ohms
cables in parallel most surely present a 25 Ohm load, provided they
are correctly terminated. I do it all the time.

You can put coaxial cables in series too, to double the impedance.
(Admittedly, I do need a piece of ferrite to do so.) Note that this is
not the same as putting one behind the other, in which case Zo indeed
does not change.

You can even take a pair of coax cables with the inputs in series, and
the outputs in parallel. You'd have to use ferrites to insulate input
from ouput. That gets you a 4:1 impedance transformer. (E.g. 100 Ohms
in and 25 out)

There are lots of great things you can do with coaxial cables and an
occasional chunk of ferrite. I haven't even scratched the surface.

Jeroen Belleman
jeroen@dxcern
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Power boost.
Date: Tue, 13 Oct 1992 18:36:43 GMT
Organization: U of Toronto Zoology

In article <XTogsB1w165w@inqmind.bison.mb.ca> norm@inqmind.bison.mb.ca (Norman P. Paterson) writes:
>I would like to take a regular 9volt battery and boost its poer as much 
>as possible.  How can I do this? ...

Uh, what do you mean by "boost its power"?  More information is needed.

If you want high voltage at a miniscule trickle of current, a battery-
powered high-voltage supply shouldn't be hard to find.

If you want substantial power (voltage and current in some combination)
in short bursts, using the battery (perhaps via a step-up power supply)
to charge a capacitor is not hard.  This is what electronic flash units do.

If you want something else, you'll have to be more specific.  Do bear in
mind that the total energy content of a 9V battery is not that large,
and nothing you can do will increase that.  (Well, apart from buying a
more expensive battery, that is... and even that has limits.)
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
From: ridder@zowie.zso.dec.com (Hans)
Newsgroups: sci.electronics
Subject: Re: Meter repair; was: Re: Help! My CD player sk-sk-sk-sk-skips
Date: 8 Oct 92 22:31:21 GMT
Organization: Digital Equipment Corporation - DECwest Engineering

In article <1992Oct7.152712.26339@athena.cs.uga.edu> mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
>In article <BFGRBZMK@dri.com> liberato@dri.com (Jimmy Liberato) writes:
>>Go to to a auto paint supply store and get the finest wet/dry sandpaper
>>they have (the kind for rubbing out lacquer, something like 1200).
>>Carefully sand radially (across tracks). Finish with Glass Wax.  Of course
>>it is probably not worth $15 of your time to do all of that!
>
>Innnnteresting!  Sounds like a way to get rid of scratchy surfaces on
>old surplus meter faces.  I'll have to try it (on meters, not on CDs...)

Gee, I'd just use Brasso.  No wax necessary, you can get it at the
grocery store, and it's a lot less than $15.

>:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 

-hans
-- 
  Hans-Gabriel Ridder				Digital DECwest Engineering
  ridder@rust.zso.dec.com			Bellevue, Washington, USA
  {pacbell,pyramid,uunet}!rust.zso.dec.com!ridder
Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: Need Op-Amp Help.
Organization: San Diego State University
Date: Wed, 7 Oct 1992 20:14:58 GMT

In article <Oct.7.14.29.39.1992.5036@clam.rutgers.edu> steuer@clam.rutgers.edu (robert Steuer) writes:
>From: steuer@clam.rutgers.edu (robert Steuer)
>Subject: Need Op-Amp Help.
>Date: 7 Oct 92 18:29:39 GMT
>I just finished an Electric Circuits Lab and one of the circuits
>involved an op-amp where the op-amp had its two bipolar power supply
>connections, and a signal generator was feeding a sine wave into the
>non-inverting input of the op-amp.  Then, a direct connection was made
>from the output to the inverting input and the gain was measured.  It
>was found that there was no change in the gain.  Then, the same
>circuit was used but instead of the piece of wire going from the
>output to the inverting input a 27k resistor was used and the gain
>remained the same although one would have thought it would
>decrease.(At least I did anyway!)  Is this because there was no second
>resistor that would normally have gone from the inverting input to
>ground?  That is all I can come up with because the formula to
>calculate gain is Afb=(Rf)/(R1) + 1 for closed loop gain.
>Can anyone verify that my assumption is correct or not?
>                                  Thanks, Rob
>-------------------------------------------------------------------------------
>| Robert Steuer               Internet: steuer@clam.rutgers.edu               |
>| Rutgers University          Amateur Radio: KF2EK@N3FOA.#EPA.PA.USA.NA       |
>-------------------------------------------------------------------------------
Yes, you are right, both are buffers, and having 27k resistor would 
compensate for the offset current if your source impedance was 27k. The gain 
of buffer is 1.

Peace and Prosperity!
  ---==< 110 >==---
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: Cross references of Transistors
Date: 16 Oct 92 03:05:27 GMT
Distribution: usa
Organization: AI Programs, University of Georgia, Athens

In article <1992Oct15.205203.1728@amd.com> mmpjh@angelo.amd.com (Javed Hussain) writes:
>Hello!	
>I have a burglar alarm made in Tiwan. The control board has couple of  
>transistors with the following markings:	
>		C945

That is a 2SC945, the most common Japanese NPN Si transistor.
I think the pinout is ECB.

This is very similar to the American 2N2222, but check the pinout.

You can buy Japanese transistors from several companies that advertise
in _Popular Electronics_.  MCM Electronics is my favorite.


-- 
:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:- Artificial Intelligence Programs       phone 706 542-0359
:- The University of Georgia                fax 706 542-0349
:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI
Newsgroups: sci.electronics