HDTenEightyP/NetNews huggingface dataset:
From: medin@catbyte.b30.ingr.com (Dave Medin)
Subject: Re: How does stereo FM radio work?
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Distribution: na
Date: Fri, 25 Sep 1992 19:53:15 GMT

In article <sehari.717379628@vincent1.iastate.edu>, sehari@iastate.edu (Babak Sehari) writes:
|> ---
|> Now you got the guy more confused than he was before.  He did not ask for
|> detail spectrum analysis! He just simply wants to know how it works. Modulation
|> at 38MHz is for the purpose of shifting the signal 19KHz upward.  Well, I
|> guess some people have to show off all the time. -:)

...not necessarily to show off, just to make sure correct information
is passed on to someone who may remember it. Your post did not
tell him how it works, and on top of that was not correct. And, the 19
KHz tone doesn't simply "move the L-R signal up 19 KHz." Sorry
for being blunt, Babak. I'm all for simplification, but for CORRECT
simplification.

-- 
 --------------------------------------------------------------------
       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)
From: andrew@alice.att.com (Andrew Hume)
Newsgroups: sci.electronics
Subject: Re: Need Help With Op-amp Substitution
Summary: some alternatives
Date: 2 Oct 92 03:22:24 GMT
Article-I.D.: alice.23780
Organization: AT&T Bell Laboratories, Murray Hill NJ



	the current recommendations via TAA are the AD797 (new),
AD811 and the LT1115. These are between $4 and $8 each.
Newsgroups: sci.electronics
From: swanee@megadata.mega.oz.au (Geoff Swan)
Subject: Re: Testing MOSFETS?
Organization: Megadata P/L, North Ryde, Sydney, Aust.
Date: Sun, 27 Sep 1992 23:38:11 GMT

In article <1992Sep24.224850.1799@news2.cis.umn.edu>, rob@dexter.psych.umn.edu (Robert Stephens) writes:
> 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)?
> 

Use your trusty multi-meter on the 2k ohms range. Measure the following:
Gate - Source ..... open
Source - Gate ..... open
Gate - Drain ...... open
Drain - Gate ...... open
Drain - Source .... about 500 ohms (due to body-drain diode)
Source - Drain .... open
Apply +Ve lead from ohm meter (usually black) to gate and -Ve lead
(usually red) to source. Without touching any of the terminals (that's
enough leakage to turn it off), measure drain-source and source-drain. They
should read close to zero. Whilst measuring source-drain, touch the gate
pin and you should see the device turn off.

    Sla/n go fo/ill,
                    Risky B.
--------------------------------------------------------------------------
Geoff Swan (research & development)   _--_|\         swanee@megadata.oz.au
Megadata Pty Ltd                     /      \ 
2/37 Waterloo Rd, North Ryde,        \_.--._/               +61 2 805 0899
NSW 2113, Australia.                       v          (Fax) +61 2 887 4847

Newsgroups: sci.electronics
From: keating@rtsg.mot.com (Edward Keating)
Subject: Re: MC68HC16EVB project question
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Tue, 29 Sep 1992 20:47:19 GMT

I too received my HC16 kit late, on 9/9/92. On top of that I also had some
hardware problems that passed the test4evb program but caused exerc_3 not
to function. I was told this morning by Dick Spilo of the EVB support
team that the deadline was extended again to 10/30/92. Evidently
that information was not updated in the letter dated August 1992 
contained in the kit.

Maybe we can get someone to post the code so we can verify that we
all "got it right". Personally, I am against "rebates" that require
you to perform some feat. This is not a "rebate" in that case, but
a contest in which you win the "rebate" amount. 

Just offer the kit at the discounted rate and make enough to go around.
Someone`s got to realize that these things always sell several
times the amount they intended to make. AND make sure that the
chip you're promoting is stocked up and available...

-- 
#undef .sig
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: HV transformer sources?
Date: 01 Oct 92  00:05:48 CST

 > Subject: HV transformer sources?
 > Organization: The Portal System (TM)
 > Message-ID: <66792@cup.portal.com>
 > Date: 28 Sep 92 23:46:40 GMT

 > Anyone know of any mail order sources for reasonably priced HV
 > transformers
 > suitable for Tesla coils? From what I've heard, neon sign transformers
 > work
 > pretty well.

Could you explain, what practical use a Tesla coil has? Other than:
- Scaring little children
- popping small animals
- lighting up flourescent tubes a few meters away
- getting the attention of the FCC

-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
From: sef@drutx.ATT.COM (Scott E. Farleigh)
Newsgroups: sci.electronics
Subject: Another MPEG/JPEG Question
Date: 5 Oct 92 13:41:46 GMT
Distribution: sci
Organization: AT&T, Denver, CO

Could someone please tell me the ANSI spec. number for the MPEG and
JPEG standards. I called ANSI and did not get a reply to my
question.

Thanks

Scott Farleigh
AT&T Bell Labs
Newsgroups: sci.electronics
From: joe@netcom.com (Joseph Jesson)
Subject: Re: FM stereo in TIME domain. (Was Re: How does stereo FM radio work?)
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Distribution: na
Date: Fri, 2 Oct 1992 16:29:26 GMT

 Heathkit actually designed a DIGITAL decoder for their top-of-the-line
 FM receiver...
From: adler@nic.cerf.net (Bruce Adler)
Newsgroups: sci.electronics
Subject: dataproducts parallel interface spec needed
Date: 6 Oct 92 23:19:54 GMT
Organization: CERFnet

Where can I locate and/or purchase a spec that describes
the Dataproducts parallel printer interface? I need the
signal descriptions, pinouts, voltage levels and timings.
Alternatively, does anybody know of an inexpensive adapter
which converts from the dataproducts interface to the
centronics interface? I can probably do it with half
a dozen parts but I don't have the right info yet.

adler@cerf.net
Newsgroups: sci.electronics
From: jsm@phoenix.Princeton.EDU (John Scott McCauley Jr.)
Subject: Re: Want an AD7569, where and $
Originator: news@nimaster
Keywords: part source
Organization: Princeton University
Date: Fri, 2 Oct 1992 21:31:23 GMT

In article <1ahvghINNhc3@matt.ksu.ksu.edu> rwy@matt.ksu.ksu.edu (Robert Young) writes:
>I'm looking for a supplier for the AD7569.  It is an 8-bit A/D and D/A in
>the same chip.  I want one or two (not hundreds...).
>
>Please suggest known suppliers.  Digikey, Jameco and Mouser are out.  I
>haven't tried all the Newark distributors in my area but so far no luck
>with them.
>
>Reply to rwy@matt.ksu.ksu.edu
>
>Thank.
>
>Robert Young   rwy@matt.ksu.ksu.edu

Active Electronics has recently picked up AD. Try giving them a call.

	Scott

(from the list posted to sci.electronics)
Active Electronics
11 Cummings Park
Woburn MA 01801
(800)-677-8899 (US)
(800)-363-6592 (Canada)
$25 minimum, $5 S&H UPS, free catalog.  They have 8 stores in the US
(Santa Clara CA; Chicago IL; Baltimore MD; Woburn MA; Detroit MI;
Mt. Laurel NJ; Long Island NY; Seattle WA) and 9 stores in Canada
(Quebec City; Montreal (2); Ottawa; Mississuaga; Winnipeg; Calgary;
Edmonton; Vancouver BC).  Lots of stuff, oriented more toward supplying
last-minute requirements of companies than hobbyists, but perfectly happy
to take your money in small doses (stores have no minimum order or
shipping&handling).  Some items in their catalog are subject to a $25 per
ITEM minimum, which is kind of a drag.
Xref: sparky sci.electronics:16635 comp.sys.ibm.pc.hardware:26224
From: t8c192@soph.cs.ubc.ca (Michael Angelo Relova)
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
Subject: Serial Port Problems
Date: 6 Oct 1992 10:47:58 -0700
Organization: none
NNTP-Posting-Host: nass.soph.cs.ubc.ca

I'm having problems with my serial port... I have a 386/33 machine that is hooked on with a USR DS 16.8k modem... I've installed a 16550 onto my serial... but when I put my modem on COM2 (the one with the 16550), everything works except my external protocols... my protocols report that there is NO carrier detect on COM2... (DSZ is one of the ones I use)... 

Please respond via Email

thanks!

t8c192@cs.ubc.ca

Newsgroups: sci.electronics
From: michael@labtam.labtam.oz.au (Michael Podhorodecki)
Subject: Re: BCT vs FCT
Organization: Labtam Australia Pty. Ltd., Melbourne, Australia
Date: Mon, 28 Sep 1992 02:40:44 GMT

From article <1992Sep25.180311.25165@adobe.com>, by pngai@adobe.com (Phil Ngai):
> In comparing an 74BCT244 to a 74FCT244A, I see no reason to use a BCT
> device. The FCT has the same drive, uses less power, and is faster.
> Is there any reason to use BCT that I have overlooked?
>
Ground Bounce. FCT designs are very critical and application specific.
-- 
Michael Podhorodecki                                michael@labtam.oz.au
Labtam Australia Pty. Ltd.                          Phone: +61-3-587-1444
Newsgroups: sci.electronics
From: bkr@drdhh.hanse.de (Bjoern Kriews)
Subject: Re: 68HC11 problems
Organization: Digital Island
Date: Sun, 27 Sep 1992 05:10:41 GMT

geoffrey@cosc.canterbury.ac.nz (Geoff Thomas) writes:
>I've writing an application that uses the Output-Compare functions
>of the HC11 to wiggle two Port A output pins at various times. The
>wiggling is supposed to be under interrupt control; i.e. at a
>particular time OC1 triggers and writes a logic 1 to one pin. It is
>then supposed to cause an interrupt and set itself up to write a
>logic 0 to the pin about 1000 clock cycles later, but the interrupt
>is not occurring.

Did you clear the interrupt flag before rti ?

Here is some code I use to generate tones (_tone1 contains the
frequency):

You should initialize TOC2 before enabling the timer.

btw: I once fiddled with OC1, did not work - then used OC2 and it did,
maybe I overlooked something I should have configured - perhaps try that.


irqserv1:	ldd     TOC2+REGBASE
                addd    _tone1
                ldx     #REGBASE
		std	TOC2,X
                bclr    TFLG1,X $BF 
		rti


Good luck, Bjoern















-- 
bkr@drdhh.hanse.de - Bjoern Kriews - Stormsweg 6 - D-2000 Hamburg 76 - FRG



Newsgroups: sci.electronics
From: kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan)
Subject: Opening other people's Garage doors :)
Organization: Clarkson University
Date: Fri, 2 Oct 1992 20:57:49 GMT


Hi.  I was wondering if its possible to construct a garage door
opener that can broadcast on any frequency you want so that you can
open other people's garage doors as you drive by :)

- Rich
From: jpw@minerva.ece.drexel.edu (Joseph Wetstein)
Newsgroups: sci.electronics
Subject: Re: multimeters
Date: 2 Oct 92 17:33:33 GMT
Distribution: na
Organization: Drexel University, Philadelphia PA

In article <1992Sep25.015938.28455@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>Two that I really like:
>
>Beckman DM25L (the one I'm using now; measures V, A, R, C, transistor gain,
>               and diode forward voltage)

Anyone got the number for Beckman?


>
>Tektronix' new one that costs about $100
>              (measures all of the above and can also test a battery
>               under load).
>
>

What is the model #? I would like to call for specs.


jpw@coe.drexel.edu
Newsgroups: sci.electronics
Subject: Automotive sensors
From: gpxpost@otago.ac.nz
Date: 4 Oct 92 13:29:15 +1300
Organization: University of Otago, Dunedin, New Zealand


I am building a device which needs to sense information from the
car it is situated in. What I need to know is the distance traveled,
this should be quite simple, probably by hooking into the odometer
cable, but any pointers on devices would be much appreciated.

The second sensor is a bit more tricky. I need to know the 
orientation of the car, i.e. north-south-east-west. It would be 
better if the sensor gave an absolute reference rather than relative, 
then if the power fails the computer won't lose its orientation.

On possible solution is to keep track of the steering wheel angle, 
but this could be inaccurate. It depends on how fast the car is 
travelling how much it turns, and it is possible for the car to skid, 
then I don't know what direction it is facing.

Anyone done this before, or got any ideas?

Thanks
Jason  
Newsgroups: sci.electronics
From: popineau@prunel.ese-metz.fr (Fabrice Popineau)
Subject: Re: MC68705P3S,need a programmer
Organization: Ecole Superieure d'Electricite, Etablissement de Metz, France.
Date: Wed, 30 Sep 1992 03:27:44 GMT
X-Posted-From: prunel.ese-metz.fr
NNTP-Posting-Host: sol.ctr.columbia.edu


In the same field :
 	How can  I duplicate  a 68705P3S ?  I got a Proteus  Universal
Programmer (from  B&C Microsystems Inc.) and it  doen't seem to  work,
even for reading.

Thanks for any clue,

F. Popineau
--
e-mail: popineau@loria.loria.fr	      
        popineau@ese-metz.fr                 
voice-mail: (+33) 87-74-99-38                
surface-mail: 	Ecole Superieure d'Electricite
	      	2 rue Edouard Belin           
		F-57078 Metz Cedex 3	      
		FRANCE			      

Newsgroups: sci.electronics
From: hcooper@javelin.sim.es.com (Harrison Cooper)
Subject: PC based Scopes - info needed
Summary: require 400 KHz/2 Mc SR
Keywords: digital scopes
Organization: Evans & Sutherland Computer Corporation
Date: Thu, 1 Oct 1992 16:24:39 GMT


I am looking for a PC based digital scope board/software system. My requirements
are 400 KHz bandwidth and a 2 MHz sample rate.  Does anyone have any
experince with these, and know the sources for such systems?

Please e-mail to hcooper@javelin.sim.es.com

-- 
--------------------------------------------------------------------------
| Harrison Cooper                    | Methods of locating me :           |
|                                    | email : hcooper@javelin.sim.es.com |
| SP Hardware Design                 | Phone : 801-582-5847 ext 3578      |
Newsgroups: sci.electronics
From: wdp@gagme.chi.il.us (Bill Pfeiffer)
Subject: Re: Ultra-stable FM transmitter?
Originator: wdp@gagme
Organization: Gagme Public Access UNIX, Chicago, Illinois.
Date: Wed, 30 Sep 1992 05:09:19 GMT


The Ramsey Electronics FM-10 kit is said to be the absolute
best available.  It is stereo, but can be made mono for
slightly better s/n ratio.  Very good audio quality and
operates on a couple of AA penlight batteries.

Said to transmit a stable FM carrier for several hundred feet w/builtin 
antenna whip.  Dont have address handy, maybe someone else does.  Good Luck
From: stanb@hpnmdla.sr.hp.com (Stan Bischof)
Date: Mon, 28 Sep 1992 21:48:32 GMT
Subject: Re: Cable TV bill (was Re: Cable "silver bullets")
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics

In sci.electronics, davepat@flash.ATC.Olivetti.Com (Dave Patterson) writes:

>Maybe this is a bit naive, but why not forget 'em all, and get a 
>satellite dish?

Don't know if it passed, but I remember the Cable industry trying to get a bill
through congress that forces dish owners to pay the local cable company
for the privilege of using their dish. Anyone dish owners out there
who know? (I believe that this was in the form of a 'tax' on receivers
which was eventually forwarded to the cable folks).

Stan Bischof
Santa Rosa
From: humphrey@hightop.nrl.navy.mil (Jeff Humphrey)
Newsgroups: sci.electronics
Subject: F-F-F-FAST ROMS
Date: 2 Oct 92 17:48:13 GMT
Distribution: world
Organization: Naval Research Labs (Washington DC)
Originator: humphrey@hightop


  I'm looking for a source for the FASTEST ROMS you can POSSIBLY
  think of.  I've found 4Kx8 35ns eproms, but I need even more
  speed ... < 20ns preferred.  Even if you don't have the source,
  How fast can a ROM go ?

  More interested in prom/eprom than masked, but I'd like to
  hear about them too ... R they faster ?

-- 
 _     ___   ___ _   _ ____
| |   / _ \ / __| | | | ___| #include "standard.disclaimer"   <- IMHO
| |__| |_| | |__| |_| |___ | humphrey@hightop.nrl.navy.mil  (703)960-1000
|____|\___/ \___|\___/|____| @Naval Research Labs           (202)404-8241
From: reiner@medusa.bioc.aecom.yu.edu (Peter D. Reiner)
Newsgroups: sci.electronics
Subject: signal generator CD
Date: 5 Oct 92 18:42:17 GMT
Organization: Albert Einstein Coll of Medicine
Originator: reiner@medusa

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
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: Opening other people's Garage doors :)
Date: 3 Oct 92 01:26:33 GMT
Organization: AI Program, University of Georgia, Athens

In article <kennehra.718059469@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
>
>Hi.  I was wondering if its possible to construct a garage door
>opener that can broadcast on any frequency you want so that you can
>open other people's garage doors as you drive by :)

You would have to vary not only the frequency, but also the audio tone
modulated onto it (for older ones) or the digital code modulated onto
it (for newer ones).



-- 
:- 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
From: johnh@macadam.mpce.mq.edu.au (John Haddy)
Subject: GAL tristate question
Organization: Macquarie University, Sydney
Date: Wed, 30 Sep 1992 22:46:51 GMT


We've relatively recently started using GAL's from Lattice in our designs. For,
the first time, our latest project had cause to use the tri-state feature of
16V8's and 22V10's (i.e. having a product term control the .OE line).

We use CUPL to compile the source to a JEDEC file, and a Logical Devices ALLPRO
to program them.

The problem is: while the pins without .OE control function perfectly, those
which we do wish to tri-state don't seem to. 

In one case, an output should go Hi-Z when a switched input is active. However,
the line stays permanently high, and cannot be pulled low with a resistor to
ground. When the switch is in a position to enable the line, the output acts
very much like a capacitively coupled line: the line stays at +5V, with spikes
corresponding to the edges of the expected square wave output.
(this is in a 22V10)

Does anybody have any ideas?

I've tried a really basic test on a 16V8 - two inputs; one controlling an output
and the other controlling that output's .OE line. This does not appear to work
either.

John Haddy

----------------------------------------------------------------------------

      |  _  |_   _   |_|  _   _|  _|              Electronics Department
    |_| (_) | | | |  | | (_| (_| (_| \/           School of MPCE
    ---------------------------------/-           Macquarie University
                                                  Sydney, AUSTRALIA 2109

    Email: johnh@mpce.mq.edu.au, Ph: +61 2 805 8959, Fax: +61 2 805 8983

----------------------------------------------------------------------------
From: pandey+@cs.cmu.edu (Manish Pandey)
Newsgroups: sci.electronics
Subject: Infra Red Data Link: Need Help building one
Date: 2 Oct 92 15:53:22 GMT
Article-I.D.: cs.BvI44y.K0p.2
Organization: School of Computer Science, Carnegie Mellon


 I am involved in a project which involves connecting a HP-95LX
palmtop computer to a local area network via an infra red ( IR ) link.

 The link must be able to support at least 9600 baud. In the figure
below IR Communicator1 and 2 are basically an IR transmitter/ receiver
pair each. 

        Typical Room, ( say 20' by 24' )
   ____________________________________________________
  |                       |____| IR Communicator1      |
  |                                                    |
  |                       /                            |
  |                      /                             |
  |                     /  Communication at 9600 baud  |
  |                    /    using IR                   |
  |                   /                                |
  |              _____                                 |
  |          ____|___| IR Communicator2                |
  |         |        |                                 |
  |         |________|                                 |
  |      palm-top HP95LX                               |
  |                                                    |
  |                                                    |
  |____________________________________________________|

 I need suggestions on how to design and build such a system. Any ideas
you have may be useful to me. So please send them to me. My main difficulty
is with the actual analog/optoelectronics portions of the link. Designing
protocols/error correction etc seems to be the simple part.

 I envisage finally ending up with a system which like the TV remote
system does not need much of an alignment between the remote and the
photodetector in the TV. Only that the remote must face in the 
general direction of the TV.  So I was wondering what kind of power should
the IR LEDs have ? Is a power output of 12mW adequate. Would I need several
LEDs to achieve my goals? Would a photodarlington ( with other circuitry )
do for a detector? The response time figures for photodalingtons seem
to range from 40 microseconds (us) to ~100us. Would normal phototransistors
have sufficient gain to be useful? 


Thanks 

Manish Pandey

***************************************
School of Computer Science,
Carnegie Mellon University,
Pittsburgh, PA 15213-3891.
Ph: (412) 268-3054 (w), (412) 421-8403
-- 

Manish Pandey
SCS-CMU 412-268-3054(w) 412-421-8403(h)
pandey@cs.cmu.edu
From: pauls@trsvax.tandy.com
Date: 05 Oct 92 11:31 CDT
Newsgroups: sci.electronics
Subject: Re: CEM chips
Message-ID: <288200013@trsvax>
Nf-ID: #R:pavo.concordia.ca:1649516852:trsvax:288200013:000:114
Nf-From: trsvax.tandy.com!pauls    Oct  5 11:31:00 1992


They are still available from Doug Curtis at:

On-Chip Systems
1190 Coleman Ave
San Jose, CA 95110
(408)988-5400


Newsgroups: sci.electronics
From: neal@cmptrc.lonestar.org (Neal Howard)
Subject: Re: Multimeters
Date: Tue, 29 Sep 1992 02:25:59 GMT
Distribution: na
Organization: CompuTrac Inc., Richardson TX

I also recommend FLUKE. They may cost a little more than others, but you'll
get your money's worth in accuracy, reliability, ruggedness and excellent
factory service if you ever need it. My model 77 is going on 10 years old
and is working perfectly. I blew it up once, when it was about 2 years old
by accidently hitting it with over 1kv D.C plus God only knows how much R.F.
from the plates of tubes in a very high power tube type R.F. power amplifier. 
 The Fluke service center here in Dallas fixed it within
about a week and the repair was only about thirty dollars.
From: jpw@minerva.ece.drexel.edu (Joseph Wetstein)
Newsgroups: sci.electronics
Subject: Re: FCC regulations & telephones
Date: 2 Oct 92 17:34:59 GMT
Distribution: na
Organization: Drexel University, Philadelphia PA

In article <1992Sep25.141926.2114@crd.ge.com> mark@e7sa.epi.syr.ge.com writes:
>
>	I'm looking for copies (preferrably electronic) of FCC regulations
>	that relate to telephone circuitry.  Any hints?
>	
>Thanks!
>
>Mark
>
>mark@e7sa.epi.syr.ge.com

Me too! 

Can anyone help?

Joe Wetstein
jpw@coe.drexel.edu
Newsgroups: sci.electronics