HDTenEightyP/NetNews huggingface dataset:
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: Simple voice response device
Date: Fri, 11 Dec 92 18:36:37 CST
Organization: The Inquiring Mind BBS  1 204 488-1607

gregg@bss1.umd.edu (Gregg Piermarini) writes:

> 
> 
> A friend here at work wants to know if there is a device which would play a 
> pre-recorded message when a sensor is touched.  This person didn't say if 
> they wanted the message to be digitally recorded and stored in memory or 
> just activate a walkman or something like that.  I figured that the best 
> place to look for something like this is radio shack.  If anybody can point 
> me to a store/catalog or even a circuit schematic/book I would greatly 
> appreciate it.  Please leave a message here or send mail to 
> 	
> 	gregg@bss1.umd.edu
> 
> 
> Thanks a lot
> 
> 
> Gregg
> 
> 
> 

IF you don't mind interfacing to an answering machine, you can get refurb 
recorders very cheap with a warranty and just use a transistor or 
something to pull-down the voltage on switch contacts of the PLAY or OCO 
I mean.. OGM PLAY switch. You can then take the speaker output to a 
larger external speaker for better quality sound.
My GE model has 1 TOUCH PLAY which automatically REWINDS,PLAYS MESSAGE 
AND STOPS. ($40 CDN) All you need is 3 wires to do this.
SIGNAL (to extrnal speaker)
GROUND (common)
PLAY-  (which is probably 0Vdc or contact closure to ground. and can be 
interfaced from your sensor.
For long leads >10ft, add a cap on the recorder switch to suppress noise 
and false switching. Since it is edge triggered, momemtary sensor active 
is all you need.

Tony Stewart/ Unisys Canada  (204)257-9233 All opinions are my own!

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: "The Glob" Atari 2600 processors ???
Organization: SSC, Inc.,  Seattle, WA
Date: Thu, 17 Dec 1992 19:55:24 GMT
X-Newsreader: TIN [version 1.1 PL6]

RichTheManKennehan (kennehra@craft.camp.clarkson.edu) wrote:
: Hi.  I opened up one of my atari 2600 games, and instead of a regular
: chip inside, there was this small plastic glob where the ROM chip    
: should be!!!!   what is this?  

It's called "Chip on Board".  The chip (or die) is glued or
soldered right to the circuit board, wire bonded to the
circuit and protected with a glob of epoxy.  

Saves the expense of bonding the die to the lead frame,
moulding the epoxy package around it, attaching the packaged 
part to the board, and soldering it.

Sure it might break sooner, and there's no way in hell you
can repair it, but with consumer electronics, you get what 
you pay for.

Mark Zenier  markz@ssc.wa.com  

Newsgroups: sci.electronics
From: ziggy@r-node.gts.org (Adrian Buss  Sys-Op)
Subject: The wonder chip
Organization: R-node Public Access UNIX Information System (416-249-5366)
Date: Wed, 16 Dec 1992 05:40:12 GMT

A while back on server occassions I have picked up discusion on
chips that act as encoders.  These neato little chips take the noise
from the comutator and use is as an encoder type signal.

I was wondering if anyone has tried these and can tell me a part number
and even better a place where I can get them.  A price would be cool
too.  Any help would be great.

Regards
ziggy

If it is not too much trouble could yo mail this info to
ziggy@r-node.pci.on.ca as we have lost our primary hard drive
and can not keep news around for very long :(.  I try read
the group every day but I would hate to miss any replies

THANKS

-- 
ziggy@r-node.pci.on.ca  <--- New and impoved fastest route :) USE IT!!
ziggy@r-node.gts.org         | Have you rubbed noses with an Eskimo today??
ziggy@zooid.guild.org        | My inability to spell and gramatize are no
adrian@skypod.guild.org      | reflection on the GENERAL CANADIAN intelligence!!
Xref: sparky sci.electronics:21000 sci.energy:6207 rec.autos.tech:16824
From: pngai@adobe.com (Phil Ngai)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 92 17:39:46 GMT
Organization: Adobe Systems Incorporated

In article <BzE2oz.I4H@ns1.nodak.edu> csmith@plains.NoDak.edu (Carl Smith) writes:
>I am not going to argue the above point, but consider this.  If you are
>going to measure danger by the amount of stored energy, then which is
>more dangerous when it explodes?  A flywheel that has enough energy to 
>move a car 100 miles at freeway speeds, or a tank of gasoline with enough 
>energy to move a car at greater-than-highway speeds for 300 miles?

It depends on how fast you release the energy. A damaged flywheel will
release all its energy at once. A tank of gasoline by itself will not
explode in a collision, despite what you see in the movies.

Why don't you go buy a gallon of gasoline in a metal container, take it
as high up as you want, and drop it. It will not explode. It might
splatter, but it will not explode.

You can also try shooting it with a rifle or whatever. I have.
It's pretty boring.

>>Unless you wrap the flywheel in a massive enough container that it can absorb
>>all that energy without vaporizing, you're going to have an explosion.
>
>Why bother, we don't wrap our gas tanks in a container that would contain
>their explosion?

Because gas tanks don't explode. Movies are not reality.

-- 
My opinions are my own.
From: dhi00@ccc.amdahl.com (mofo )
Newsgroups: sci.electronics
Subject: bench equip query
Date: 16 Dec 92 01:19:21 GMT
Reply-To: dhi00@juts.ccc.amdahl.com (mofo )
Distribution: na
Organization: Amdahl Corporation, Sunnyvale CA

on a 20MHz scope, the only signals you have a decent chance
of seeing at 20MHz are sinusoids and even then, the phase
and amplitude will not be correct.  you'll just have an indication
that their exists a signal with a definitive frequency.

forget about square waves beyond 10MHz unless you want an 
overall idea that a square wave is being attempted on the
device being observed.  audio work is very good with this
type of scope.  i own a dual trace 35MHz and have been very
satisfied with it for home use and little high speed 
digital work.  i have a jameco model probably made by someone
else.

d
From: stead@skadi.CSS.GOV (Richard Stead)
Newsgroups: sci.electronics
Subject: Re: Flywheel batteries as EV power source
Date: 18 Dec 92 23:21:22 GMT

In article <102559@netnews.upenn.edu>, jhaines@eniac.seas.upenn.edu (Jason Haines) writes:
> In article <1992Dec18.012654.26238@ra.oc.com> rodder@ccwf.cc.utexas.edu (Jon D. Rodder) writes:
> >In article <1992Dec17.011649.987@cmkrnl.com> jeh@cmkrnl.com writes:
> >>
> >>Then we come to electric motors to drive the wheels.  Electric motors have
> >>wonderful torque/speed characteristics for vehicles (they generate maximum
> >>torque just before stall speed, which may make transmissions and clutches
> >>unnecessary) but lousy power density -- look at the size of a 1-hp. electric
> >>motor sometime and tell me how big a motor would have to be to accelerate a
> >>car fast enough to keep up with gasoline-powered ones.  

> original message).  The 20hp DC brushless motor in our solar
> car is also about 6" in diameter and less than 6" (not counting the cooling
> fan and wiring set-up attached to the side) long.    I haven't weighed the
> motor recently so this is from memory but I thinkj it weighs about 30 lbs

Ok, so we can use a smaller flywheel to drive this car, but a smaller IC
engine would do it, too.  These solar cars are tiny, very light (usually
made of composites, etc) and very low air friction.  Sure, they could
make all cars this way, and they'd get 800 mpg.  So the real gain here
is the design of the car, not the engine or power supply.  They can't sell
cars of this design, however.


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
From: dag@col.hp.com (David Geiser)
Newsgroups: sci.electronics
Subject: Re: Wow, really BIG resistors....
Date: 15 Dec 1992 23:07:12 GMT
Organization: HP Colorado Springs Division
Distribution: global
NNTP-Posting-Host: hplsdor.col.hp.com

Dissipaters.
Newsgroups: sci.electronics
From: washer@sequent.com (Jim Washer)
Subject: Need help with PADS shareware
Organization: Sequent Computer Systems, Inc.
Date: Sat, 12 Dec 92 21:51:54 GMT

I've been playing with PADS logic and pcb, and have managed to 'capture'
my schematic, create the netlist, and read it in using pcbshare.

I have not managed to route it (auto route I hope), nor print a postscript
image of the etch (single sided board).

Any ideas?

 - jim

washer@sequent.com

Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: "The Glob" Atari 2600 processors ???
Date: Sun, 20 Dec 1992 02:58:25 GMT
Organization: U of Toronto Zoology

In article <kennehra.724614930@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
>HI.  Ok..."the glob" is impossible to remove.  Is there some way to
>melt the protective covering off without losing the data?  Also, how
>would I tell what kind of chip is underneath the glob?

Apart from the possibility of deducing the chip type by studying the rest
of the circuit, the only way to find out is to get the epoxy off.  That
is Not Easy.  The stuff is completely inert as far as the usual run of
solvents etc. are concerned.  It can be done, using truly vile chemicals,
but it's not the sort of thing you want to try unless you really know
what you're doing.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
Xref: sparky sci.electronics:20893 comp.lang.forth:3639
From: edsverk@ed4000-2.lerc.nasa.gov (Kenneth Lee Atchinson)
Newsgroups: sci.electronics,comp.lang.forth
Subject: Where can I get the BASIC or FORTH versions of Zilog Z8671?
Keywords: chip uC Z8671
Date: 16 Dec 92 23:39:31 GMT
Organization: NASA Lewis Research Center

Has anyone got a lead on a supplier of the Z8671 microprocessor?
This microprocessor can be hooked up with few discrete circuitry
and give a *working* computer with BASIC or FORTH programming 
environment.  I am more interested in the FORTH version, but I 
will take the BASIC one also.  I need address and phone please.
Note this is the same chip that Circuit Cellar author Steve Ciarcia
featured in Byte Magazine in 1983.  :-)

Thanks in Advance.
-- 
Kenneth Lee Atchinson
edsverk@ed4000-2.lerc.nasa.gov
Standard Disclaimers Apply.
Newsgroups: sci.electronics
From: strohm@mksol.dseg.ti.com (john r strohm)
Subject: Re: Information about CODEC ...
Organization: Texas Instruments, Inc
Distribution: usa
Date: Thu, 17 Dec 1992 00:43:38 GMT

In article <1goesdINNlvr@charnel.ecst.csuchico.edu> helho@ecst.csuchico.edu (Weird!!) writes:

> Would someone tell me what is a CODEC chip? I guess the chip may

Kenneth, CODEC stands for "COder/DECoder".  It is a generic term for an
analog-to-digital/digital-to-analog converter that also does a code conversion
on the digital to reduce the number of bits that must be transmitted for a
given signal level.  (The idea is to use most of the "dynamic range" of the
digital code for values close to zero, and just use a few values for extreme
values of the analog signal.  This makes for high fidelity on low-level
signals, which is where the real information is in telephony.)  They are
generally used in telephony applications.
Newsgroups: sci.electronics,comp.robotics
From: dougs@david.wheaton.edu (Doug Smith - SGA)
Subject: Re: Infrared remote controls
Organization: Wheaton College
Date: Thu, 10 Dec 1992 22:35:11 GMT

>Regarding the format of Infrared Remote Control signals:

Some remotes send the key code then a key still down code as long as 
you press it.
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: What newsgroup is thi
Date: 17 Dec 92 06:40:24 GMT
X-Maildoor: WaflineMail 1.00r


  Sir S. spoke forth saying:
"What newsgroup is this?" toward 
 on 12-15-92  17:15
 JS> Newsgroups:
 JS> comp.graphics,sci.math.num-analysis,sci.math,sci.math.stat,sci.electron
 JS> ics,sci.engr Subject: What newsgroup is this?

 JS> I thought I was looking at sci.engr, but I must be mistaken. I just
 JS> went through several articles about stereotypes and net advertising.
 JS> Out of about thirty articles, there were maybe two or three that had
 JS> anything to do with engineering. Please take it elsewhere.

    Dear sir;

         Please read the Newsgroups: part of your heading next
    time.  This is not a flame.  However,  if you will notice
    "someone" has been cross posting like mad.  It's grossly
    irriatating, but poeple normally don't reply to it from
    sci.electronics (one place where your reply has appeared).

    I suggest though that poeple who do this "cross posting an
    off topic message" into multiple groups should get there net
    access REVOKED.  It's rediculous and costs money.  I don't
    mind off topic messages to much just as long as they are VERY
    short threads.

    The thread "D O E S ..." should be in alt.politics or some
    area of related intrest.  sci.electronics has a LOT of
    bandwidth as it is without cross posts.

    Each cross post cost that much more to be sent.  Say each
    character of ones message costs .01 of a cent to send.  Each
    messa is say 4000 character and cross posted 5 time that
    20000 characters over EACH subscribing institution.  let's
    say there are 1000 universities that echo each of the same
    groups. that 40,000,000 characters.  This means the tax payer
    theoretically payed 400 dollars for that message. This says
    nothing of FOLLOWUPS either.

    It's a very expensive habit.  Especially since it's been
    being cross posted on everything including alt groups.  Which
    is just plain rediculous.

                Stephen Cyberman@Toz.Buffalo.NY.US
             Mangled on Wed  12-16-1992  at 19:18:26

... Please do not look directly into the laser with remaining eye.
---
 * Blue Wave/QWK v2.11 *
                                                       
Newsgroups: sci.electronics
From: byron@cc.gatech.edu (Byron A Jeff)
Subject: Queries: Feeding of NiCads? Low dropout regulator?
Reply-To: byron@cc.gatech.edu (Byron A Jeff)
Organization: Georgia Institute of Technology
Date: Tue, 15 Dec 1992 03:03:36 GMT

From my previous post (Pseudo-static RAM Summary) you may know that I'm looking
into building a high capacity RAM Disk. While it is expensive (about $108/meg)
by my figuring's I can get a whopping 21+ Mbytes/sec transfer rate. With this
kind of performance it's worth taking a crack at it.

To do this however I need a power source. I'd like to use Radio Shack (RS)
High capacity NiCad batteries. The D size battery has a huge 4.3AHr capacity
at 1.25V! From what I read in previous messages this capacity is valid and
has been tested by Consumer Reports or somesuch.

I want to know a little more about how to feed these puppies. All I know I've
read from an article in Circuit Cellar Ink (July-August 1992) on Data Logger
construction. It has all kinds of battery and low-power goodies. Here's the
scoop I gathered (please feel free to amend or correct):

1. Standard NiCads can be charged at 1/10 of rated capacity (.1C). 
2. When charged at .1C it takes about 14 hours to charge to capacity.
3. Cells cannot be overcharged at .1C rate. The article implied that charging 
   power can be applied to the cells indefintely at this rate without damaging
   the cells.
4. Faster charging rates can be used to quick charge but special circuitry
   to detect temp. is necessary to shut off the charging process.

Are these correct?

The circuitry shown in the article described a very, very simple circuit:

Wall wart -> Limiting resistor -> Diode -> Battery -> Diode -> Chips

Is it that simple? The diodes were germanuim (sp) to ensure a low voltage drop
across them.

Any other suggestions or tips?

The article also described "float voltage". It seemd to be high than the rated
battery voltage. Why is that?

Lastly can anyone suggest a low power voltage regulator that requires low
voltage overhead? Something suitable for battery powered operations?

I'd like to keep a wall wart plugged into the batteries all the time even
though my off the cuff calculations indicate that I can get up to 18 weeks 
of usage from a single charge.

Thanks for any help you can give.

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: albrecht@csd4.csd.uwm.edu (Chad Edward Albrecht)
Newsgroups: sci.electronics
Subject: Re: Printed Circuit Boards
Date: 11 Dec 1992 22:51:53 GMT
Organization: University of Wisconsin - Milwaukee
NNTP-Posting-Host: 129.89.7.4

Due to the huge amount of respnses I have recieved for the PCBROUTE
program I am not going to email it individually but rather list
a FTP site that it is available on.

wuarchive.wustl.edu

DIRECTORY: /mirrors/msdos/cad/
FILENAME: pcbroute2.zip

If this doesn't help you let me know.

Chad

--



-----------------------------------------   "The chess board is the world,
|	albrecht@csd4.csd.uwm.edu	|    the pieces are the phenomena 
|      albrecht@convex.csd.uwm.edu      |    of the universe, the rules of
|        acct146@carroll1.cc.edu        |    the game are what we call the
|       COMPUTING SERVICES DIVISION     |    laws of nature."
|	   UNIX  CONSULTING             |
|	   MICRO CONSULTING	        |           --T.H. Huxley
|     EMS 229-5370 Bolton 229-5317      |
-----------------------------------------
 
Newsgroups: sci.electronics
From: ankleand@mtl.mit.edu (Andrew Karanicolas)
Subject: Re: Yamaha Chip STK3042 III
Keywords: Yamaha, Amp
Organization: MIT Microsystems Technology Laboratories
Date: Sat, 19 Dec 1992 06:41:30 GMT

In article <1g9gm1INNe61@lucy.ee.und.ac.za> robertso@unpsun1.cc.unp.ac.za writes:
>Hi,
>
>I'm trying to obtain the amplifier driver chip for a Yamaha Amp.  The number is STK3042 mark III.  Any ideas? (Preferably a mail order company!).
>
>
>Thanks
>
>Mike Robertson                 |  DISCLAIMER: These are *my* thoughts & are
>robertso@unpsun1.cc.unp.ac.za  |  thus not necessarily those of the Computer
>                               |  Services Div. at the University of Natal

Call MCM electronics.  I don't have the 1-800 phone number but the
1-800-555-1212 operator should know about it.  I've bought power amp
modules from MCM and they work fine.


-- 
Andrew Karanicolas
MIT Microsystems Technology Laboratory
ankleand@mtl.mit.edu
Newsgroups: sci.electronics
From: whit@carson.u.washington.edu (John Whitmore)
Subject: Re: Testing solar cell performance w/computer assistance?
Keywords: Solar cell
Organization: University of Washington, Seattle
Date: Wed, 16 Dec 1992 06:28:50 GMT

In article <639@thunder.LakeheadU.Ca> dnwangus@flash.LakeheadU.Ca (Dave Angus) writes:
>In article <1992Dec14.223424.21680@unlv.edu> bill@pauli.lv-physics.nevada.edu (Bill ODonnell) writes:

>>     If extreme accuracy isn't a major concern you may
>>want to consider using the game port on the Apple.  The
>>Apple II series and the Apple IIGS both use a 4 channel
>>A/D converter to read the voltage (via a variable resistor)
>>at the game port.

>Sorry; that ain't correct.  The Apple ][ game ports work almost exactly
>like the IBM game ports:  they use a 558 quad timer chip to generate 
>time delays proportional to RC time constants.  The C is built into
>the game port, the R is provided by the joystick or paddles' 
>potentiometers.  The game ports can measure resistance, but not 
>voltage.

	There is a workaround for this problem; the timer requires
an input current, and a resistor and two PNP transistors makes
a pretty good voltage-to-current converter.

           +5V o------+----------+
                    |/         |/
Vinput+-----VVVVV-+-+----------+
             R    | |\         |\
                  +---+          |
                                 +(to game port)

The transistors should be the same type, and at the same temperature
(glue them together).  There is some slight temperature-dependence
due to the Vbe of the transistors, but it is possible to calibrate
the system for near-room-temperature conditions.  It's hard
to draw in ASCII, but the emitters of the two transistors
are connected to +5V (and they must be PNP).

	You want R to be roughly 220 k ohms for 0 to +5V inputs,
and 400 k ohms for -5V to +5V inputs.  The +5V power
is available, of course, at the joystick connector on the
game port.

	John Whitmore
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: Request: Low power op-amp suggestions
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 14 Dec 1992 19:03:28 GMT

Mike DeMetz (miked@syscon.rn.com) wrote:
: I think the LM351 is designed for low power operation.
	       ^
	       |
I think it is LF351 from NATIONAL-SEMICONDUCTOR. But for less
noise and very less powerconsumption you should evaluate the
EXCALIBUR-opamps like TLE2021CP from TEXAS-INSTRUMENTS.

Bye Thomas
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: Flywheel batteries as EV power source
Date: 13 Dec 92 11:45:34 PST
Organization: Kernel Mode Consulting, San Diego, CA

In article <Bz6nuM.LCo@acsu.buffalo.edu>, v064mb9k@ubvmsd.cc.buffalo.edu 
(NEIL GANDLER) writes:
>  I just have finished reading the latest Popular Science issue. Jan 93.
> On p. 27 they discuss flywheel power as a possible energy source for 
> future Ev's. Claimed advantges are a cruising rnage of over 600 miles
> on an overnight charge on GM's Impact. With a battery weight of only
> 600 pounds and a life of 25,000 miles and with no chemical waste when
> disposed this new power source could revolutionise the
> EV industry. Why is this technology not being looked into more. What
> are the dissadvantages. What is this technology exactly. How is
> mechanical energy stored in such great amounts. 

It isn't exactly "new" -- PS had a cover story on flywheel-based EVs something
like 20 or 30 years ago.  At that time there was a small fleet of
flywheel-driven streetcars in, I believe, Denmark. These did not use a
high-tech flywheel and could run for only ten minutes or so away from the power
source -- but that was sufficient to allow them to leave the overhead power
lines for a block or two. 

To be usable for an electric vehicle, you need a massy, large-diameter flywheel
that spins at phenomenal speeds.  It is made with high-tech materials (carbon
fibers, that sort of thing) so that it won't tear itself apart.  It must be
spun in a vacuum chamber or else a lot of the stored energy goes to heating the
air.  It must be Floated on near-frictionless bearings, such as magnetic
bearings, and coupling to the outside is via a magnetic clutch (ie the flywheel
shaft does not extend outside the enclosure).  

All of this is easy to dream up but a bit hard to actually build, especially in
production quantities. 

The flywheel must be arranged with a vertical axis so that gyroscopic effects
don't make it impossible to turn the car.  Still, you need to worry about these
effects whenever the car enters a sharply-banked road or freeway ramp.  

Popular Science publishes an awful lot of "gee-whiz" stuff, with the 
implication that these things are just around the corner.  It often isn't so,
and I don't think it's so with the flywheel-powered EV. 

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
From: vengrov@bimacs.BITNET (vengrov)
Newsgroups: sci.electronics
Subject: help
Date: 15 Dec 92 13:45:55 GMT
Reply-To: vengrov@bimacs.UUCP ()
Organization: Bar-Ilan University, Israel.


       Is there anybody who knows where i can find data

          on I.C. (integrated circuits)



                             thank you

                                DAVID

From: Star.One@f88.n106.z1.fidonet.org (Star One)
Sender: Usenet@f-454.fidonet.org