HDTenEightyP/NetNews huggingface dataset:
From: Dmerrill@bnr.ca (Dana Merrill)
Subject: Re: Telephone "in use" light
Followup-To: sci.electronics
Organization: BNR
Date: Mon, 11 Jan 1993 15:04:21 GMT

In article <1993Jan10.063830.1164@athena.mit.edu>, cthomas@athena.mit.edu
(Michael T Ford) wrote:
> 
> In article <1io3i5INNnat@MINERVA.CIS.YALE.EDU> shaffer-wendy@MINERVA.CIS.YALE.EDU (Wendy Shaffer) writes:
> >Regarding the telephone in use light, the Feb issue of Popular Electronics has
> >a schematic.  Unfortunately, I'm completely unfamiliar with how the telephone lines
> >work.
> >The schematic shows two wires going to the telephone line.  One of them is marked with the word "Tip" and a + sign.  The other is marked with "Ring" and 
> >a minus sign.  Could somebody fill me in on what these mean and how to identify
> >one from the other.  Thanks
> 
> Telephones nowadays run off of only two conductors.  The red and green
> wires are the most common.  And if I remember correctly, red is tip, and
> green is ring.  (Someone correct me if this is backwards.)
> Don't worry about hooking the circuit up backwards; the worst that will
> happen, if anything, is that it won't work.
> 
> Good luck,
> Mike WZ0C

Installers often pay little attention to polarity when installing
residential wiring.  You may find tip or ring on any color wire in the
outlet.  Many installations (particularly newer ones) use more pairs anyway
which do not necessarily include red and green!

I haven't seen the circuit mentioned, but a good design would include a
polarity guard (all electronic telephones do) so that the connection
polarity doesn't matter.

dam

==================================================================

Dana Merrill                                Bell Northern Research
DMerrill@BNR.CA                         Research Triangle Park, NC
==================================================================
Newsgroups: sci.electronics
From: thomasd@tps.COM (Thomas W. Day)
Subject: Re: PC BOARD ETCHING QUESTIO
Organization: TPS
Date: Tue, 12 Jan 1993 18:31:39 GMT

In article <76416@apple.apple.COM> apn@Apple.COM (Alex Novickis) writes:

John Schuch) writes:>>I, to, have had this problem once in a while but have 
found most >>cameramen pretty darn accurate. Another thing I ALWAYS do is 
include>>a rule in the artwork. Something like this:
>>
>>     |----|----|----|----|----|----|
>>     |                             |
>>     |<-------- 3 INCHES --------->|
>>     |                             |
>>
>>
>With current laser photoplotting technology, WHY ?? whould you want to 
>do reductions ?? LP's can generate things much finer than you can
>ever hope to etch.... I think that's about 4 mil traces with 4 mil
>seperations. And it usually costs me under 10$ for a 10x10" film (OK, 
>well I do need several of them... but still)

I guess I just assumed we were talking about taped PCBs.  There are a lot of 
good reasons for taping 4X and going for reductions on the PMT, but those 
reasons probably vanish if you are sending a file to the repro company.
From: cstadbg@csv.warwick.ac.uk (Mr M J Brown)
Newsgroups: sci.electronics
Subject: Re: How can I align a cassette tape head?
Date: 11 Jan 1993 16:24:44 -0000
Organization: Computing Services, University of Warwick, UK
NNTP-Posting-Host: mace.csv.warwick.ac.uk

In article <C0AMDI.3Ey@ve7frg.ampr.org> george@ve7frg.ampr.org (George Farris) writes:
>
>Is there any alignment tapes available that one can view with a scope an
>align the tape heads?  How is this done these days?
>
>-- 
>
>==========================================================================
>George Farris - VE7FRG          Internet  :  george@ve7frg.ampr.org
>                                 Amprnet  :  george@ve7frg.ampr.org

I find the best thing to do is to line up the head for each tape I use against
either a) the previous thing recorded or b) a commercial tape so that the
treble sound is the brightest possible. The result of bad azimuth setting
or more accurately a different azimuth setting is a loss of treble.

=============================================================================  
     _/      _/   _/   _/  _/   _/_/_/_/   |
    _/_/  _/_/   _/   _/_/     _/          |         Michael Brown
   _/  _/  _/   _/   _/       _/_/         |
  _/      _/   _/   _/_/     _/            |   cstadbg@csv.warwick.ac.uk
 _/      _/   _/   _/  _/   _/_/_/_/  _/   |     mjb@dcs.warwick.ac.uk
                                           |    csulo@csv.warwick.ac.uk
=============================================================================

Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: Filter for DIMMER with TRIAC ???
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 4 Jan 1993 12:59:24 GMT

Anders Hedberg (d89-ahg@ludd.luth.se) wrote:
: The cicuit looks like this :

The follow filter reduces the rf-radiation:

  --------------------------|-- L ----+ Light bulb +
  			   ___ 	 	 I
  220 VAC, 50 Hz, 4 A	   ___	C        I
			    |
  --------------------------|---------+ Triac +----+
 				      +
  				      Triac control circuit

	L = ~100 Micro-Henry

	C = ~100 nF  /  630 VAC

Greeting and a happy new year from	thomas
Newsgroups: sci.electronics
From: mxl@cbnewsg.cb.att.com (marc.a.levy)
Subject: Video Signals
Organization: AT&T
Date: Thu, 7 Jan 1993 16:21:36 GMT

Hi,

I have a question that someone out there may know the
answer to...

What effect would inverting the color burst do? (180 out of
phase)??  Would the colors be "Backward"?? making a light 
brown color a green color?? (Like with inverse video)?

I (Like some others I have spoken to) use the Universal
Descrambler on a non-scrambled channel, and get good, accurate
color, but when a scrambled chanell is tuned in, the collors
are incorrect (Faces look green).  I have noticed that when
the vertical lock is NOT correct, the color's sometimes are
correct.  I have also noticed that if the polarity of the
video is reversed (Neg/pos) even though the images are
reversed, the color is correct.

My idea was to put the color burst 180 out of phase (This can
be done with the spare NAND and spare 4053 (to make it
selectable)) but before I try, I wanted to know if anyone out
there had any better ideas? or for some reason thinks I am not
on the right track.

Marc.

P.S. I am talking about the Radio Electronics May 1990
"Universal Descrambler".

  

Newsgroups: sci.electronics,rec.games.programmer
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Sort of a Joke - sad though...
Organization: AI Programs, University of Georgia, Athens
Distribution: na
Date: Mon, 11 Jan 1993 00:56:58 GMT

In article <C0IEow.326@bcstec.ca.boeing.com> mce5921@bcstec.ca.boeing.com (Martin Emde) writes:

>Can anyone out there be more specific as to how those games work
>that sense screen position?  How does it compensate for different
>sized images and varying distances from the TV?

Position *on the screen* is a function of time.  Size of screen has
nothing to do with it.
-- 
:-  Michael A. Covington     internet mcovingt@uga.cc.uga.edu :    *****
:-  Artificial Intelligence Programs       phone 706 542-0358 :  *********
:-  The University of Georgia                fax 706 542-0349 :   *  *  *
:-  Athens, Georgia 30602-7415 U.S.A.     amateur radio N4TMI :  ** *** **
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: Where can i find a cheap GAL programmer?
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 4 Jan 1993 12:43:19 GMT

Mikael Andersson (mikael@terapin.com) wrote:
: I would like to buy a GAL chip programmer but are there no cheap but good
: ones on the market? I don't want to spend $400-$800 for a programmer or 
: is there anybody who has a GAL programmer for sale?

You must write more. Very important is, what type of computer do you work.
If it is an atari model st or tt, there is a lowcost GALPROMMER to program
16V8(A) and 20V8(A). Less than 400$ with included JEDEC-Compiler. The 
lowcostway is possible because the timing is generated by softawre. But 
that is not so easy with msdos-pc's, therefore GALPROMMERs for this compu-
ters cost more. If everybody wants to know more, write to my e-mailbox.

Greeting and a happy new year from  thomas
From: dplatt@ntg.com (Dave Platt)
Newsgroups: sci.electronics
Subject: Re: Ancient Scope Info Required! (Tektronix Type 564)
Date: 6 Jan 93 21:55:27 GMT
Organization: New Technologies Group, Inc.  Palo Alto CA

>I am looking for _ANY_ info on the care and feeding of the old Tektronix
>scopes.

>Oscilloscope		Type 564 

>These scopes were valve-based, and Tektronix no longer retain the manuals or
>provide any type of support for them.

One source for manuals on older Tek scopes is:

	Mr. Dean Kidd
	27270 SW Ladd Hill Road
	Sherwood OR 97140
	USA

He's a retired Tektronix engineer with a large stock of manuals for the
older Tek equipment.  I bought a manual for a Tek 475 'scope from him
earlier this year - fair price ($30 for an original manual in good
condition), quick delivery.  Much less expensive than the $100 which
Tektronix wanted for a photocopy of the manual.

I suggest that you mail him a letter with a want-list, and a couple of
IRCs to cover the postage for his reply.
-- 
Dave Platt                                                VOICE: (415) 813-8917
              Domain: dplatt@ntg.com      UUCP: ...netcomsv!ntg!dplatt
 USNAIL: New Technologies Group Inc. 2470 Embarcardero Way, Palo Alto CA 94303
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Scotchflex (Re: Vector wire pencils)
Organization: SSC, Inc.,  Seattle, WA
Date: Thu, 07 Jan 1993 22:45:37 GMT
X-Newsreader: TIN [version 1.1 PL6]

Chris Elmquist (elmquist@pez.ssesco.com) wrote:
: ScotchFlex is wonderful stuff...  but the average guy can't get it. I have
: yet to find a distributor that will sell it in smaller, experimenter
: quantities...

Newark has it in their catalog.

: How about this:  Everyone interested write a letter to DigiKey and ask
: them to carry it.  They carry plenty of other 3M products... shoot, they're
: both Minnesota companies...

Good Idea.  It's been in 3M's Electronics Specialty line (what used 
to be AP) for 3 or 4 years now, so you could talk someone into special 
ordering it if they carry that line.


Mark Zenier  markz@ssc.wa.com  

Newsgroups: sci.electronics,sci.physics
From: "glen mead" <glen.mead@canrem.com>
Subject: audio signal switcher
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 11 Jan 93 21:07:10 EST

jeh@cmkrnl.com writes:

J >Not a bad idea.  Among other things, you'll get what some manufacturers 
J >"Tuner Call" or "Tuner Standby" as a free byproduct.  (ie when you are
J >fast-winding the cassette the switch will automatically select the tuner
J >inputs)

That was another benefit I had in mind.

J >What follows are some "partly-baked ideas"; I don't by any means guarant
J >I haven't forgotten something vital:

Well, at least they're not raw. :-)  Thanks for the ideas...I had never
even thought of a VOX. 

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
From: rmf@bpdsun1.uucp (Rob Finley)
Newsgroups: sci.electronics
Subject: Re: MouseSystems Mice
Date: 6 Jan 93 04:42:06 GMT
Distribution: usa
Organization: Harris Allied Broadcast Div., Quincy, IL

In article <1993Jan4.224026.18950@vicorp.com> daniel@vicorp.com (Daniel Dee) writes:
>Are mice made by MouseSystems pretty much compatible
>except for the connector? I opened up a generic 
>MouseSystems mouse (probably for a PC) and a Sun version
>of it, and they look like they have the same components
>inside. I'm thinking of modifying one and use it on
>my Macintosh. Is this possible? Any answer will be
>appreciated.
>-- Daniel (ddee@vicorp.com)

It is true that the Sun and PC versions are identical except for the
front sticker and the wiring harness.  However, I don't have much faith
that it would work on a mac though.  Noting the specs for their IDB bus,
it doesn't look too promising.  At least, you will need a different mac
driver.

Mouse systems does make Apple Mice.  Anyone have such a beast?
Newsgroups: sci.electronics
From: ulan@ee.ualberta.ca (Dale Ulan)
Subject: Re: Surface Mount EEPROM with I2C interface.
Organization: University Of Alberta, Edmonton Canada
Distribution: sci
Date: Wed, 13 Jan 1993 03:08:39 GMT

whb@castle.ed.ac.uk (H Bruce) writes:

>I am looking for a  256 X 8 byte surface mount EEPROM with I2C an interface.
>There are DIL parts such as SGS Thomson ST24C02, but they don't seem to have
>SMT equivalents. 

>Can anyone comment ?

Microchip offers 24C04 chips in SMT... according to my data book... but
I don't have it with me in the computer lab to give a part number. Mail
me if you need it.

>Thanks,

>Henry Bruce

---
Dale Ulan  VE6DAU      ulan@ee.ualberta.ca    Comp Eng Undergrad
Newsgroups: sci.electronics,rec.games.programmer
From: rebuck@blue.crayola.cs.psu.edu (Mark A Rebuck)
Subject: Re: Sort of a Joke - sad though...
Organization: Little, if any. 
Distribution: na
Date: Wed, 6 Jan 1993 12:31:26 GMT

In article <1ict86INN2kn@fnnews.fnal.gov> behnke@FNALF.FNAL.GOV writes:
>In article <1993Jan5.200745.27696@magnus.acs.ohio-state.edu>, cwatters@magnus.acs.ohio-state.edu (Coyt D Watters) writes:
>>While working at a large retail store this Xmas (why?  the ca$h), I 
>>overheard a customer telling another sales associate that Nintendos should
>>not be sold, "because they kill the color from your tv, starting with the
>>weakest."
>>
>
>
>What's the name of this sorry a**ed store.  If they have any stores in the
>Windy City area, I'll be sure to steer clear.  No reflection on you though !!
>
>Mike Behnke

Sorry to waste bandwidth like this, but are you sure you read the 
original post correctly?  The customer was telling the sales rep that
the colors would burn out, not the other way around.

You can't fault the store if a stupid customer wanders in.

====================================================================
| Mark Rebuck           |  Some people say that daydreams are      |
| rebuck@cs.psu.edu     |  for all the lazy minded fools           |
|                       |  with nothing better to do...            |
|                       |  So let them laugh, laugh at me...       |
| 6502 forever!!        |              Jimmy Hendrix               |
====================================================================
-- 
====================================================================
| Mark Rebuck           |  Some people say that daydreams are      |
| rebuck@cs.psu.edu     |  for all the lazy minded fools           |
|                       |  with nothing better to do...            |
Newsgroups: sci.electronics
From: washer@sequent.com (Jim "Throw it over the wall" Washer)
Subject: Do I need FCC approval for small devices?
Organization: Sequent Computer Systems, Inc.
Date: Wed, 6 Jan 93 06:35:17 GMT

I have designed a small micro-contoller based product. It contains the 
micro-controller, a DTMF tone decoder, and some glue chips. I am
considering marketing this in both kit form, and as an assembled product.

Do I need to get some sort of an FCC approval on this? It is a computer
of sorts... and I understand that all computers must meet FCC standards..

Any thoughts?

 - jim  washer@sequent.com
From: kuusama@kaarne.cs.tut.fi (Kuusama Juha,,,,)
Newsgroups: sci.electronics
Subject: Re: microphone circuit
Date: 4 Jan 1993 13:04:55 GMT
Organization: Technical University of Tampere, Dep. of Computer Science ,Finland 
Distribution: world
Reply-To: kuusama@kaarne.cs.tut.fi
NNTP-Posting-Host: kaarne.cs.tut.fi
Originator: kuusama@kaarne.cs.tut.fi

In a previous article, scottb@sail.LABS.TEK.COM (Scott Baker) says:
> 
>I'm want to use a frequency counter as a guitar tuner.
> 
You may think you do, but actually you don't. With a counter you'll
get +- 1 count resolution, which on the low strings is only about 1%
accuracy which (for any musical purposes) is horribly out of tune.

You are aiming for accuracy of one or two cents, around 0.1% or
better.
--
Juha
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Caller ID "thoughts"
Date: 1 Jan 93 17:10:25 GMT
X-Maildoor: WaflineMail 1.00r

I was just looking at the caller Id specs.
Is it possible that someone could SEND data to a caller ID chip
after the phone has been take off hook?  IE can you use it as a
simplex modem?

                Stephen Cyberman@Toz.Buffalo.NY.US
             Mangled on Thu  12-31-1992  at 13:11:02

... THou shalt not denegrate.
---
 * Blue Wave/QWK v2.11 *
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: source for N cell nicads
Date: Wed, 06 Jan 93 04:26:01 GMT
Reply-To: paula@nlbbs.uucp
Distribution: world
Organization: The Electronics Workbench - Cumberland Maine


In article <5170256@hplsla.hp.com> tomb@hplsla.hp.com writes:

 > 
 > bob@kc2wz.bubble.org (Bob Billson) writes:
 > 
 > >I need a couple (9 to be precise) of 450 mAH nicads.  Problem is they need
 > >to be N cells.  Radio Shack sells N size nicads but they are only 150 mAH.
 > 
        Another source might be your local Motorola 2-Way Radio service
        shop. Many of their pagers use N cells.

        * * * * * * * * * * * * * *  * * * * * * * * * * * * * * *
	*   Paula Stockholm              paula@nlbbs.UUCP        *
	*  Cumberland, Maine          !nlbbs!paula@uunet.uu.net  *
	* * *  * * * * * * * * * * * * * * * * * * * * * * * * * * 

Newsgroups: sci.electronics
From: zhou@helios.usq.EDU.AU (qing-lun zhou)
Subject: Looking for addresses of Microtel and Microelectric Companies.
Summary: They are the manufacturers of micro-switches and magnetic cores.
Keywords: Microtel, Microelectric
Organization: University of Southern Queensland
Date: Sun, 10 Jan 1993 23:26:53 GMT

Any assistance would be highly appreciated. I also want to know more
manufacturers of micro-magnetic cores if you can kindly provide.   
Newsgroups: sci.electronics
From: cmwolf@mtu.edu (christopher m. wolf)
Subject: Re: HDTV Question
Organization: Michigan Technological University
Date: Sat, 9 Jan 1993 19:20:08 GMT

kludge@grissom.larc.nasa.gov (Scott Dorsey) writes:
>In article <1993Jan8.055618.24902@mtu.edu> cmwolf@mtu.edu (christopher m. wolf) writes:
>>If HDTV will be digital, what will be the number of available colors for
>>display?
>
>Depends on the format that is decided on.
>
>>Instead of the "infinite" we have with NTSC now, this will have to be reduced,
>>depending on the digitalization, but what are we talking about numbers-wise?
>
>Infinite colors?  With NTSC?  You have to be joking... the linearity of the
>chrominance signal is terrible on any NTSC systems.  The number of discrete,
>distinguisable colors is far fewer than those that can be seen by the eye,
>or even recorded on a good film.
>--scott

I looked at it as an analog signal have an infinite number of divisions, every
one just slightly different.  I wasn't commenting about how it IS being
used, but rather how it COULD.
Newsgroups: sci.electronics
From: martin@datacomm.ucc.okstate.edu (Martin McCormick)
Subject: What really Failed on Fluorescent Lamp
Organization: Oklahoma State University, Stillwater, OK
Date: Sun, 3 Jan 1993 14:55:25 GMT


     We recently had a fluorescent lamp ballast go bad at our
house which got me wondering about what actually happened.
The lamp in question is an instant start type, using a
12T/20CW tube.  This tube has two pins at each end and can
operate in either the instant start-type fixtures or the old
style ones that use the starter.
     The trouble started innocently enough.  The lamp didn't
light when switched on.  One could see a flash in the tube
when turning it off, but there was no other light at all.  I
had a spare tube which had, at one time, been in an old
starter-type fixture so I decided to use that one until we
could go out and buy a new one.
     The light came on with the installation of the spare
tube and we went on about other things.  A few minutes later,
my wife said that she had seen a flash.  We weren't really
sure, though, so we didn't take any action.
     About five minutes later, it was obvious that something
was terribly wrong.  The ballast was sizzling and filling the
house with the aroma of melted pitch and burning paper.  We
are, now in the market for a new fixture.
     Just for fun, I did an autopsy on the original
fluorescent tube and the spare.  The original one shows that
both cathodes are open, (infinite resistance at each end.)
The spare tube that had bin in the ballast when it smoked
shows one open cathode and one which is still good, (about
4.5 Ohms.)
I am not really sure how the instant start ballasts work, so
I am wondering if the presence of one open cathode might have
actually been what smoked the ballast since it hadn't smoked
until I installed the spare tube.  One open cathode would
cause the load to be half-wave rectified DC instead of the
full-wave load which normally occurs.
Since the ballast got severely overheated, it must be
replaced, but I would like to know what really happened.
Maybe saving the old tube turned out to be false economy.

Martin McCormick WB5AGZ   Stillwater, OK
O.S.U. Computer Center Data Communications Group
Xref: sparky sci.electronics:22387 alt.radio.pirate:755
From: system@hale.cts.com (System Administration)
Newsgroups: sci.electronics,alt.radio.pirate
Subject: Re: >= 5W AM-band amp design?
Date: Sun, 10 Jan 93 23:30:36 PST
Organization: Hale Telecommunications Inc.

svaldez@ocf.berkeley.edu (Steve Valdez) writes:

>    CVan someone point me to a source for a circuit design which
>    can take the 100mw output from my Panaxis AM transmitter (at 1500kHz)
>    and amplify it to somewhere between 5W and 20 or 30W?  
> 
>    How does one create an amp in parallel to provide greater gain?


Aside from the public service announcements about this being a no-no,
the easiest way would be modify an existing 160 meter design
to do this.  Either modify an existing unit or use some of the
advaible plans for this type of HAM equipment.

There are dozens of small tube amp projects that could be modified
for this from sub-1 Watt to a 1500 watt design in the ARRL Bible...


Hale Telecommunications Inc.        Public Access Internet Site (hale.cts.com)
Owned by a happily armed            (619)/660-6734 V.32bis                
conservative republician.           NYC has gun control.                       
                
-----   Magic Johnson Knows How To Dribble More Than Just A Basketball!   -----
Newsgroups: sci.electronics,sci.energy,rec.autos