HDTenEightyP/NetNews huggingface dataset:
From: provost@vlsi.polymtl.ca (Benoit Provost)
Subject: Re: Help my project SPEAK...
Organization: Ecole Polytechnique de Montreal
Date: Mon, 28 Sep 1992 15:23:40 GMT

ma2b+@andrew.cmu.edu (Matthew Keith Albright) writes:
: Okay, I would like a project that I am workng on to be able to speak. 
: Like maybe 10 - 20 different 3-4 second messages (In perhaps three
: languages).  What is the easiest (cheapest) way to do this?  My ideas so
: far: 
: 
: The method chosen will have to be able to be interfaced to a
: microcontroller.  So are either of these ideas valid, or is there a
: better way to do this?  Any ideas are welcome.  FYI, I am leaning toward
: idea #2.

	There is a new chip by ISD (Information Storage Devices), the 
ISD 1016, that can store speach for 16 seconds.  There is three versions
of the chip, the 1016, 1012 and 1020.  The last two digits indicate the sampling
time.  The less storage time you have, the highest sound quality you get 
(the 1012 is the best for quality).  You can divide the time in a certain number
of durations.  That way, you can adress the chip to let the 13th "sound cell"
speak.  You can connect several chips in parallel too extent the sampling
time.

	You can contact Steve Stephansen at ISD (408) 428-1400
or Dan Rappaport at Hamilton/Avnet (their reprensentative in Canada)
 						(310) 558-2773
: 
--
-------------------------------------------------------------------------------
| Benoit Provost                            | Woke up this morning and        |
| Ecole Polytechnique de Montreal           | found myself dead.              |
| Departement de Genie Electrique           |                                 |
Newsgroups: sci.electronics,sci.chem
From: rick@cs.sunysb.edu (Rick Spanbauer)
Subject: HC/CO sensor?
Organization: State University of New York, Stony Brook
Date: Thu, 1 Oct 1992 21:02:19 GMT

I am interested in building a car emissions tester, one that
would give an accurate reading of CO/HC levels in automobile
exhaust.  Does anyone know of a source for such sensors that are able
to accurately measure CO/HC levels or alternatively what sensor 
technology is used in commercial emissions inspection machines?

In response to a similar posting made in rec.autos.tech, someone sent
along some e-mail that claimed Radio Electronics ran a "build your own"
exhaust analyzer article.  Anyone happen to remember the article, and what
issue it was in?

					Rick Spanbauer
					SUNY/Stony Brook
From: kad@ip29!bob (Keith Drescher ip30)
Newsgroups: sci.electronics
Subject: Re: Help! My CD player sk-sk-sk-sk-skips
Date: 2 Oct 92 15:24:31 GMT
Distribution: usa
Organization: InterBold

I adjusted the tracking control on my 6 year old JVC unit last night.  
It did solve the intermittant tracking problem that I've been having
for a quite some time now.

But a caveat:
I found a book on CD repair that tells how to do it right -
so next week I'm going to put a scope on the thing and adjust it
to spec.  I read the book and decided that adjusting the tracking
control by the "guess" method wouldn't do any harm, just maybe put
my CD player out of comission until I could get a scope home.
A CD player is a fairly complex item though, there is the real chance
just twiddling any pot you happen to find might cause more harm than
good - be forewarned.

Keith Drescher
Newsgroups: sci.electronics
From: medin@catbyte.b30.ingr.com (Dave Medin)
Subject: Re: FM stereo in TIME domain. (Was Re: How does stereo FM radio work?)
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Distribution: na
Date: Tue, 6 Oct 1992 17:18:12 GMT


In article <1992Oct05.172142.5600@ssc.com>, markz@ssc.com (Mark Zenier) writes:

|> Sorry, the question should have been: Do commerical FM stereo transmitters
|> work this way?  (I've been trying to come up with a cheap stable FM stereo
|> exciter for a couple of years.)

The BE line of exciters, known to have the best track records (my
opinion), still use balanced modulators. Any gain/phase trims are
easily accomplished and are stable. Although I haven't tried the
sampling technique, I would think that carrier feedthrough (the measure
of balance of a balanced modulator) would be hard to make anything
else but poor on a sampling system.

|> My speculation is that, within the broadcast community, this technique
|> is well known.  But outside that, most people are working off the
|> description from the FCC regulations, which is the frequency domain
|> description.  (Since they are more interested in bandwidth and 
|> interference than simple design.)

While it is known, it is not used often because of phase and filtering
contraints (which would not a problem with the I/Q chroma circuit
operating at 3.58MHz due to the much less demanding nature of chroma).
It is hard to maintain stereo separation (the first parameter to degrade)
unless the L-R is extremely accurate.

|> So you end up with things like the North Country Radio/Graf and Sheets
|> transmitter (Radio-Electronics March and April 1988) which used a
|> balanced modulator for the 38 kHz subcarrier and was overly complex.
|> And didn't work well, according to a friend who built one.
|> (Which makes sense, keeping your phase responses right through all
|> that would be hard.)

Actually, the balanced modulator approach is not difficult at all,
even with the MC1495 chip, if properly biased. The 1495 is not
state of the art for distortion, though. As far as separation, which
is the best measure of how well the differencing/modulator combo works,
I've gotten a respectable 60 dB from the 1495 on the bench.

-- 
 --------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    Intergraph Corp.				(205) 837-1174 (h)
       M/S GD3004
  Huntsville, AL 35894 		Internet: medin@catbyte.b30.ingr.com
				UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
Newsgroups: sci.electronics
From: hcb@netcom.com (H. C. Bowman)
Subject: Circuit simulation software
Keywords: recommendations
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Distribution: usa
Date: Sat, 3 Oct 1992 16:19:34 GMT

Hiya--
I'm a recent EE graduate working my first job, and I need some advice on
circuit simulation software.  I've got about $2000 in my budget to get
a PC-based package to help me do analogue and mixed-mode design.  What
packages are available given these constraints, and what works well?
I wish I could narrow the projects down a bit, but it's a small company,
and things (like my design schedule) change overnight.
Thanks!
--cliff

Newsgroups: sci.electronics
From: jeremym@fraser.sfu.ca (Jeremy Thomas McDonald)
Subject: Can despiking caps be connected to a central ground?
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Sat, 3 Oct 1992 07:23:03 GMT

Do despiking caps need to go directly between the VCC and GND inputs
of a given IC, or could they go between VCC of the IC and some central

ground location, or even another IC's ground, for that matter?

Newsgroups: sci.electronics
From: Bob.Clarke%bbs@actcnews.res.utc.com (Bob Clarke)
Newsgroups: sci.electronics
Subject: No Clean Solder Flux
Date: 2 Oct 92 15:45:50 GMT
Organization: United Technologies Research Center
X-Posting-Software: UnixBBS 1.02a S/N 190921

Anyone using NO CLEAN SOLDER FLUX in a wave solder process in the
Aerospace industry?
If you tried it and now don't use it, why?
If you are or are about to try it, would you like to open a dialog?
I realize there isn't many manufacturing type questions on
sci.electronics, anyone know of a more appropriate forum?
--
Bob Clarke, user of the UnixBBS System @ actcnews.res.utc.com
E-Mail: Bob.Clarke%bbs@actcnews.res.utc.com
========================================================================
   United Technologies Corporation
   Opinions expressed do not necessarily represent UTC.
Newsgroups: sci.electronics
From: "glen mead" <glen.mead@canrem.com>
Subject: help - stepper motor
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 30 Sep 92 20:12:45 EST

Hi All,

  I have a project which I'm working on and I need help with the
operation and control of a stepper motor.  The specific stepper motor is
a Tohoku Ricoh type 7M100200 with ratings of 24Vdc, 0.2A, and 4.8W.  I
do have the pin names (13-pin connector) but I have no idea how to
control this unit.  Any help with this motor would be greatly
appreciated.  I can supply a more in depth description of my usages for
this unit and the pin labels if needed.

Glen

PS: Anybody know how if there are any Ricoh technicians on the network
or that I can access through the network?
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: FM stereo in TIME domain. (Was Re: How does stereo FM radio work?)
Organization: SSC, Inc., Seattle, WA
Distribution: na
Date: Sat, 03 Oct 1992 04:28:13 GMT

In article <1992Oct1.165659.8131@bnr.ca> mwandel@bnr.ca (Markus Wandel) writes:
>Say that everything was based on square waves, and that you started out
>with a 38KHz clock waveform.  Based on this clock, you alternately select
>the left or the right channel for transmission, transmitting a sequence
>of samples L, R, L, R, L, R, etc.  You also add a 19KHz pilot tone at
>half the clock frequency.

Well, damn.  If you plot it out on paper, it does work.  You end
up the L+R, added with the L-R (or R-L) times the 38 kHz subcarrier.

Getting the 19 kHz phase just right could be a problem, as would getting
the lowpass filter needed to round off the sharp edges without messing
up the phase response.

Did any commercial gear work this way?

And does anyone have references to the original papers when this
system was thought up?  (By Zenith, as I remember it.)

Mark Zenier  markz@ssc.wa.com
From: llee@joker.sanders.lockheed.com (L. Lee)
Newsgroups: sci.electronics
Subject: PIC & DIGIKEY
Date: 29 Sep 92 16:37:12 GMT
Distribution: sci.electronics
Organization: Lockheed Sanders, Inc.

Netters:

I'm letting the net know that DIGI-KEY now stocks the great PIC line of
"RISC" microcontrollers! I saw it in their latest catalog. For those who've
never heard of the PIC, its similar in spirit to the MC68HC705 and its variants
only much faster. 

I, of course, have no connection with Microchip Technology or
DIGI-KEY, other than being a satisfied customer.

Len.
From: Ted_Eugene_Viens@cup.portal.com
Newsgroups: sci.electronics
Subject: Re: Russian tubes
Date: Fri,  2 Oct 92 19:13:56 PDT
Organization: The Portal System (TM)

>Can anyone recommend importers of Russian made tubes?  I'm particularly
>interested in type 6550 tubes.Someone had told me that the former Soviets
>can export and sell tubes at a very low price.
>
>Thanks,
>
>Larry
>
Hello Larry.
ARS Electronics Van Nuys, CA 91409 Sells a broad range of Vacuum Tubes
from many countries.  They list a 6550 from China at half the GE tube
price.  They also sell Matched Tube Sets.  Their Phone number is
800-422-4250.
Good Luck...  Ted..
Newsgroups: sci.electronics
From: alcuew@meaddata.com (Alcue Williams)
Subject: Plans
Organization: Mead Data Central, Dayton OH
Date: Tue, 6 Oct 1992 16:19:36 GMT
Distribution: sci.electronic


Hi,


I was wondering if anyone might know where I could find the plans/schematics for
building a C02 emitter and an ionizer.

Thanks in advance.


Alcue

 ____________________________________________________________________________
|                                                                            |
|          Alcue Williams III - Product Certification Engineering            | 
|          Mead Data Central                  alcuew@meaddata.com            | 
|          P.O. Box 933                     uunet!meaddata!alcuew            |
|          Dayton, OH 45401                   (513) 865-1252                 |  
|____________________________________________________________________________|
|                                                                            |
| "We trained hard,  but it seemed that every time we were beginning to form |
| up into teams, we would be reorganized.  I was to learn later in life that |
| we tend to meet any new situation by reorganizing;  and a wonderful method |
| it can be for creating the illusion of progress while producing confusion, |
| inefficiency, and demoralization."      -Petronius Arbiter, 210 BC         |
|____________________________________________________________________________|
From: enns@waterloo.hp.com (Roger Enns)
Newsgroups: sci.electronics
Subject: Re: Querry: Compas w/ digital output
Date: 28 Sep 92 22:35:06 GMT
Organization: HP Panacom Div Waterloo ON Canada
X-Newsreader: TIN [version 1.1.4 PL6]


>	I'm looking for a compas (navigational) with a digital output, for
>use in a project of mine (for undergraduate EE senior design).  A flux gate
>model would be ideal.  The unit should be relatively inexpensive (less than one
>or two hundred dillars - prefferably even less).  
>
>	I would appreciate any ideas, leads, refereals or suggestions.
>
I would suggest checking out the latest J.C. Whitney catalog.
This is a company that sells a huge variety of automotive
accessories.  Their catalogues can be found on just about any
well-stocked newsstand.

I think they had digital compasses for under $100.00 last time I
looked.

--
Roger Enns (enns@waterloo.hp.com) Panacom Automation Division, HP
C-GIIV Dragonfly, 1979 RX7 13B, 1985 Colt, 1984 Interceptor 500
From: mcs@wet.UUCP (Gil Nardo)
Newsgroups: sci.electronics
Subject: Re: Triggering multiple flashes to "paint with light"
Date: 6 Oct 92 21:56:55 GMT
Distribution: usa
Organization: Wetware Diversions, San Francisco

fontana@dogwood.cis.ohio-state.edu (Mark Fontana) writes:
[discussion about triggering photo-flash from main flash deleted]
> I'm looking for advice on how to wire these up.  I figure I can
> just use an RC circuit on each one to get the desired delay.  The two
> main problems are:
> 
>      1) detecting the main flash, which may be very faint, depending
>         on the placement of each auxilliary unit.  If anyone can think
>         of an easier way using sound, say from a cap gun or something,
>         I'm open to suggestions.

The choices for light sensors are photo-resistors, solar cells, and
photo-transistors.  Use any of these in conjunction with circuits
containing a relay and you you have yourself a light-sensitive switch.  
Here is an example from a Radio Shack mini notebook (cat no. 276-5012):

                +9
                 |
    +------------+
    |            | 
    |            | 
 ~--Q1           |
    |            |
    +------------Q2-----+
    |                   |
    R1                Relay
    |                   |
    +-------------------+
    |
    GND

Q1 = Photo transistor where ~ is light input
Q2 = 2N2222
R1 = 100K pot (adjust for sensitivity)
Relay = 500 Ohm, 6-9V
-- 
Gil Nardo                  | mcs@wet.com
Migrant Computing Services | (415)664-1032
1032 Irving Street, #435   |-----------------
San Francisco, 94122       | Supernova = *!
Newsgroups: sci.electronics
Subject: Re:  Help! My CD player sk-sk-sk-sk-skips
From: zoltar@glasgow.amigans.gen.nz (Grant Thoms)
Date: 27 Sep 92 16:15:39 PST
Distribution: world
Organization: The .SIG research Department, General Enquiries Office

In article <XVkoRB1w164w@geloser.login.qc.ca> atomas@geloser.login.qc.ca (J-F Bissonnette) writes:
>> Well, I've got a 7 year old D4 that has tens of thousands of play hours
>> and still plays as well now as it did when it was new. I don't know about
>> current models, but sony cd players of the D4 vinatge had a worm screw
>> that controlled the head movement during play. If this worm screw got
>> worn or dirty, the head would stick. If your model is similarly designed,
>> you could try cleaning and possibly lubing the worm screw.
>> 
>> George
>
>Well perhaps someone can tell me what my problem is.  I got a 2 years
>old Luxman and it still plays fine, no skiping.... except one 
>one song and it on one of my favorites.  When I first had this CD,
>it was'nt skiping at all, but since a few weeks, on that song, it 
>skips.  It does'nt seem like theres any damage on the CD itself.
>
>Does anyone have an idea of what is going on in that case?
>
>Thanks!
>
>J.F.

I had a cd that jumped slightly on one of my fav songs, I gave it a good
polish (from the centre out) and it came right, sometimes you can
Polish out the scratches and it helps..

-- 
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
        Grant Thoms (Zoltar) Co-Sysop of `Silent Imperium' BBS
  //                Zoltar@Glasgow.Amigans.Gen.NZ
\X/                             ----
         Standard Quote: `Insert $10 for the next 0.5 seconds'
                *** Opinions expressed are my own ***
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: Tone (sound) chip info?
Date: 01 Oct 92  16:35:59 CST

 > Subject: Tone (sound) chip info?
 > Organization: North Dakota Higher Education Computing Network
 > Message-ID: <20787@plains.NoDak.edu>
 > Date: 29 Sep 92 15:48:12 GMT


 > Does anyone know of a chip that could take 4 bits as input and output
 > the
 > information neccessary for a tone to be generated.  The 4 bits are there
 > so
 > 16 different sound combinations can be generated.  This chip would then
 > be
 > hooked up to a speaker (with amplifier, etc. in between).

 > Any info on a chip like this or similar (say takes 3 bits and generates
 > 8
 > tones, or whatever) would be greatly appreciated.  This is for a project
 > for visually impaired school children.

 > Mail info to bell@plains.nodak.edu, or post if desired.
I would mail, but my letters tend to get lost in the gates somewheres.

What you could do (real simple), is take a low-frequency clock source, put that to a Divide by N counter, and the output put to a speaker. The binary inputs of the divide by ten would of course be your inputs. Be forewarned however that the frequency response would be quite logarythmic (sp?).

/1  ****************************************
/2  ********************
/3  *************
/4  **********
/5  ********
/6  *******
/7  ******
/8  *****

 > Thanks,
 > Rob

Hope it helped Rob.
-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
Newsgroups: sci.electronics
From: kehoe@netcom.com (Thomas David Kehoe)
Subject: Stumped by op-amps
Organization: Netcom - Online Communication Services (408 241-9760 guest)
Date: Tue, 6 Oct 1992 22:21:01 GMT

I'm trying to boost a microphone (-50 dBm) to instrument 
level (-17 dBm).  I looked through Horowitz & Hill's chapter 
on op amps, and they have a circuit for a 40 dB amplifier.  
It has 

5 op-amps
3 diodes
14 resistors
4 capacitors
5 variable resistors
3 switches
and various other parts

I don't want to put 34+ parts together for a simple 
amplifier!  Aren't there chips with all this in one package?  
I doubt I'm the only one who's ever wanted a 40 dB 
amplifier.  I was hoping there'd be a chip with 8 legs: 2 
input, 2 output, 2 power source, 2 for a potentiometer.

I'm also stumped by H&H.  Do the simple circuits in the 
front of Chapter 4 do something?  I'm not sure if I want an 
inverting, noninverting, optional inverter, follower, 
differential, summing, floating power supply, or power-
switching amplifier.  I just want an amplifier.  H&H forget 
to mention what each circuit they describe can be used for.  
Is there a book that teaches you how to make useful, simple 
circuits?

I heard about a SSM 2015 microphone preamp chip, with 54 dB 
gain.  I called 10 electronics suppliers in Silicon Valley, 
and none have this chip (Insight, Halted, Alltronics, 
Quement, Anchor, Haltek, R&D, Fry's, and Zak's).  Where else 
should I call?

Also, are microphones ac or dc?  I'm sure there are both, 
but mine has a battery in it, so I assume it's dc.
-- 
"Why my thoughts are my own, when they are in, but when they are out
they are another's." - Susannah Martin, hanged for witchcraft, 1692.
Thomas David Kehoe          kehoe@netcom.com         (408) 354-5926
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Pullups needed for high-impedence TTL inputs?
Date: Sat, 3 Oct 1992 23:23:08 GMT
Organization: U of Toronto Zoology

In article <jeremym.718096799@sfu.ca> jeremym@fraser.sfu.ca (Jeremy Thomas McDonald) writes:
>I know pullups are required for CMOS inputs if the inputs can go into
>high-impedence.  Does the same hold true for TTL?  What about HCT?

TTL *tends* to pull itself up... but it's not that dependable.

The rule is:  never, never, never leave an input open -- unconnected or
connected only to drivers which are in high-impedance mode -- unless you
know the logic family is *specifically designed* to permit this (most
are not; the only ones I can think of offhand are the ECL families).
Always use a pullup or pulldown.  For most of the common cases, if the
choice matters at all, pullups are preferred.
-- 
There is nothing wrong with making      | Henry Spencer @ U of Toronto Zoology
mistakes, but... make *new* ones. -D.Sim|  henry@zoo.toronto.edu  utzoo!henry
From: at847@cleveland.Freenet.Edu (Jeff Hunsinger)
Newsgroups: sci.electronics
Subject: Telephone interface
Date: 2 Oct 1992 04:11:13 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: hela.ins.cwru.edu


This has got to be an FAQ, but I just read about 100 subject lines
and didn't find it. I am trying to hook up a DTMF decoder (SSI202)
and a voice synthesizer (amplified with an LM386) to a telephone line.
The DTMF decoder works fine so long as I don't hook up the amp.
I tried putting an amp before the decoder, but that doesn't seem
to work either.
Here's my current set-up:

----Cap--- 600:600 ohm matching transformer-> amp -> ssi-202
                                           <- Amp -< voice synth.

Any help?
Jeff
Newsgroups: sci.electronics,comp.robotics
From: martinez@rodan.acs.syr.edu (Kenneth Mtz. (YONIX))
Subject: PHOTO detectors
Originator: martinez@rodan.acs.syr.edu
Organization: Syracuse University, Syracuse, NY
Date: Mon, 28 Sep 92 09:00:01 EDT

   We are trying to learn about IR sensors. 
   
	- How they work ?
	- What range of light do they detect?
	- How can an LED be used jointly to detect pulses?
	- What are their minimal power requirements ?
	- Who markets inexpensive but reliable ones? 
	- How much do they cost?
	- Where can we get more info?

 Thank you very much your contributions will be greatly appreciated.

Newsgroups: sci.electronics
From: aslt@acad2.alaska.edu
Subject: Re: Ultra-stable FM transmitter?
Organization: University of Alaska
Date: Wed, 30 Sep 1992 16:44:49 GMT

In article <5170224@hplsla.hp.com>, tomb@hplsla.hp.com (Tom Bruhns) writes:
> 
> Interestingly, I was just thumbing through an old GE transistor manual,
> and saw a circuit for a crystal-controlled FM transmitter--using a
> tunnel diode!  But just try to find one ;-)
> 
> 
Reminds me of a couple of years ago I was looking for a tunnel diode.
When asking, the universal response was a blank look.  This by 
otherwise-usually very smart, knowledgable folks.  Oh well.
From: Robert.Stephens@mailbox.bison.mb.ca (Robert Stephens)
Newsgroups: sci.electronics
Subject: Testing MOSFETS?
Date: 24 Sep 92 22:48:50 CST

Organization: University of Minnesota

I have an N-ch MOSFET hi-speed switch.  It has
a Source, Drain, and Gate.  Is there a way I
can test its integrity by itself (out of the
circuit)?

Please E-mail with suggestions.
Thanks in advance


---------------------------------------------
Robert C. Stephens   rob@dexter.psych.umn.edu
---------------------------------------------
Human Factors Research Laboratory
University of Minnesota
60 Norris Hall
172 Pillsbury Dr. SE
Minneapolis, MN  55455
---------------------------------------------
Phone: (612) 626-7521
---------------------------------------------

 * Origin: The Electronic Mailbox (1:348/7.0)

Newsgroups: sci.electronics