HDTenEightyP/NetNews huggingface dataset:
From: pjh@mccc.edu (Pete Holsberg)
Newsgroups: sci.electronics
Subject: Re: Pinouts for Princeton Ultrasync monitor?
Date: 13 Nov 92 21:20:54 GMT
Organization: The College On The Other Side Of Route One

In article <1992Nov9.233621.4021@memstvx1.memst.edu> langston@memstvx1.memst.edu (Mark C. Langston) writes:
=  Does anyone out there have the pinouts for a Princeton Graphics Systems
=Ultrasync multisync monitor,,

DB-9 Cable:
	TTL	Analog
1.	gnd	red
2.	red2	green
	or gnd
3.	red	blue
4.	green	composite or horzontal sync
5.	blue	pcg mode
6.	green2	gnd
	or
	intensity
7.	blue2	gnd
8.	horiz.	gnd
	sync
9.	<--vert sync-->

Hope this helps.
Newsgroups: sci.electronics
From: wai@socs.uts.edu.au (Wai Yat Wong)
Subject: Various national colour code of wires(e.g. earth, neutral) for elec. plug
Summary: What colour do different country use for active wire in an electrical plug?
Keywords: active, neutral, earth, colour code, electric plug, electric socket
Organization: Computing Sciences, Uni of Technology, Sydney.
Date:  8 Nov 92 23:27:23 GMT

Anybody out there can tell me about the colour coding various
country use for labelling a wire as active or neutral or
ground.

I know that green is obviously earth, but I have this
two extra wire; one of them is white, the other is
black. Does the white go to the active pin and
black go to the neutral pin?

Also, the only thing I know about alternate current is
that the current flows both way alternatively. Then please
explain to me why there is a voltage (240 V) between active
and ground, but nothing between neutral and ground?

Finally , for U.S.A's electrical plug, which pin is always
designated as active (the smaller one)? Also, I like to
find out the info for Australian systems.


Educate me ( the ignorant sponge)

My email address is wai@socs.uts.edu.au

--


Wai-Yat

Newsgroups: sci.electronics
From: kharstin@MtHolyoke.edu (Ken Harstine)
Subject: EMI/RFI on VHF channels
Organization: Mount Holyoke College
X-Newsreader: Tin 1.1 PL5
Date: Sat, 7 Nov 1992 15:20:17 GMT


If you are having interference from an electronic device, remember that it
takes an antenna to radiate RF.  All the cables attached the offending
device are antenna's.  Your primary goal is to make them poor antennas. 
You can raise the impedance (and thereby reduce the radiation) of the cable
antennas by adding ferrite loops to the cables at the equipment end.  Radio
Shack sells clip on ferrites for this purpose.

I would suggest placing the ferrites on all the cables from the device.  If
you want to trouble shoot, you should then remove the ferrites one at a time.
The other way to trouble shoot would be to add the ferrites one at a time,
until the problem goes away.  Then you could test remove each one until
the problem comes back.  The reason you can't trouble shoot with just one
ferrite, is that the interference is cumulative, and if the cables are
radiating at similar power levels, you would at best see a 3dB difference
when one cable is eliminated, and the other continues to radiate, this may
not be enough reduction to be detectable without lab equipment.

I hope this is a help.
From: gav553@cbnewsi.cb.att.com (george.w.gavaras)
Newsgroups: sci.electronics
Subject: Wanted: Magnetron Magnet
Date: 13 Nov 92 18:20:01 GMT
Distribution: usa
Organization: AT&T


Need a 10 KGauss or better magnetron magnet for a kid's science fair project.
These were apparently fairly easy to come by until about 10 years ago.
From the pictures of such things, the magnet appears to be shaped like
a large doughnut with a bite out of it.  From the size of it, I'd guess
somewhere in the range of 10 - 15 pounds.

Anyone have such a beast at a reasonable price or know where to find
one?

Thanks for any information.

George Gavaras
AT&T Bell Laboratories
Newsgroups: sci.electronics,misc.forsale.computers.pc-clone,misc.forsale.computers.d
From: wallace@iitmax.iit.edu (Wallace)
Subject: Re: 486 CPU KOOLERS FOR SALE
Organization: Illinois Institute of Technology
Date: Thu, 5 Nov 92 23:53:16 GMT

In article <1992Nov4.182328.19037@news.clarkson.edu> faruque@sun.soe.clarkson.edu (Abdullah Faruque,334CH,3752,2654247) writes:
>From article <1992Nov4.084645.16364@brtph560.bnr.ca>, by kimmyd@bnr.ca (Kimmy Posey P920):
>> In article <1992Nov4.004352.15077@fasttech.com>, zeke@fasttech.com (Bohdan Tashchuk) writes:
>>>In <1992Nov02.215953.23041@kksys.com> gk@kksys.com (Greg Kemnitz) writes:
>>> 
>> 
>> [ highly relevant facts deleted ] 
>> 
>>>>Two -- We have NEVER seen a system fail in service due to a processor chip
>>>>failure.  This is despite having sold many many hundreds of systems.  Our
>>>>customers are in general long term customers, and most of our business is
>>>>repeat business, so we have the opportunity to track the history of the
>>>>systems we have sold.  We also service a large number of systems sold by
>>>>others, many with substandard cooling, and have never seen a failed cpu chip
>>>>in them either.
>> 
>The above statement reminds me the following quotation:
>
>"The difference between a computer salesman and a used car salesman is
>that, the used card salesman knows how to drive a car and when he is
>lying"
Well, I have had 3 486/33 chips fail in a system where the
power supply was located on the bottom of the tower. Finally,
I changed to a different case with the power supply at the
top(normal).

Ralph

-- 
=============================================================================
I am not in search of excellence,       
I am in search of perfection.           Dr. Ralph W. Wallace               
                                        
USPS: Illinois Institute of Technology  TEL#: (708) 682-6030      
      Dept. of Computer Science         UUCP: wallace@iitmax.IIT.EDU
      210 E. Loop Road                  BITNET: CSWALLACE@IITVAX
      Wheaton, Illinois  60187
Newsgroups: sci.electronics
From: sehari@iastate.edu (Babak Sehari)
Subject: Re: How to filter out EMI/RFI from TV signal
Originator: sehari@class1.iastate.edu
Keywords: TVI problems
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Fri, 6 Nov 1992 04:21:49 GMT

In <1992Nov05.202945.26916@bnr.ca> grier@bnr.ca (Brian Grier) writes:

>It depends on how the noise is getting to the TV

>> Several appliances seem to introduce EMI/RFI to the TV signal, namely
>> my CD players (portable and component), my PC (386DX), and the usual
>> hair dryer, maicrowave, etc.  I'm interested in finding out what I can
>> do to make the TV signal more pure.  Here are some observations:

>If the interference is being transmitted via the airways then you are
>probably in a bit of trouble. However is the noise is being transmitted
>via the power lines you may be in luck. Try wrapping the power lines
>from your CD player and TV around a toroid. Six or seven turns will
>clean up most common mode noise. The toroids are available at Radio
>Shack, and cost around $15 for a pack of four.

>Brian, WS1S
>Bell Northern Research
>Research Triangle Park, NC

There are also cable magnet, which are high u(r) materials that make
the noise to disappear.

Noise form air could be cancel out by using high directivity antenna and/or
active noise canceling methods.

                        With highest regards,
                             Babak   Sehari.

--
From: smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC)
Newsgroups: sci.electronics
Subject: Re: Very annoying Humm on home stereo
Date: 10 Nov 1992 15:34:09 GMT
Organization: SunConnect
Distribution: world
NNTP-Posting-Host: hardy.france.sun.com

In article <1992Nov10.054130.50347@ns1.cc.lehigh.edu>, ebd0@ns1.cc.lehigh.edu (EDWARD BAYKAR DERVISHIAN) writes:
> I have a REALLY old SCOTT receiver. It works absolutely fine except for one
> very annoying problem. It has a constant hum to it. Even when volume is off,
> it hums through the speakers. If I shut off the speakers, there's no noise
> (obviously). What can I do to get rid of this hum if anything?

Try replacing the electrolytic smoothing capacitors in the power supply.
Electrolytics dry up, and after about 10 years in a hot box they
probably won't be doing much smoothing.

Steve


-- 
Steve McKinty
SUN Microsystems ICNC
38240 Meylan, France
email: smckinty@france.sun.com	   BIX: smckinty
Newsgroups: sci.electronics
From: wrb@cbnews.cb.att.com (wallace.r.blackburn)
Subject: Re: Adding a Second Phone Line
Organization: AT&T
Distribution: usa
Date: Thu, 5 Nov 1992 19:18:46 GMT

In article <1992Nov5.165850.23994@cbnewsk.cb.att.com> rrh@cbnewsk.cb.att.com (richard.w.heebner) writes:
>From article <Bx8C3s.C70@news.cso.uiuc.edu>, by cathy@uxa.cso.uiuc.edu (Catherine T Vojtas):
>> I need to install a second line so I can have one for voice, one for data
>> (can you guess why?)  The installation charge for the labor of putting in
>> a second phone line is a bit pricey, but the woman at Illinois Bell told 
>> me that I could do it myself if I knew how...
>> Anyone know how this is done?  I have some background in basic 
>> electronics(simple stuff like building a rectifier, etc...) but I think
>> I could handle it.
>> Any help would be greatly appreciated..
>> Thanks.
>> 
>> -- 
>> ----------------------------------------------------------------------------
>> Catherine Vojtas                        mail to: cathy@uxa.cso.uiuc.edu
>> University of Illinois at U-C
>> ----------------------------------------------------------------------------
>I think the person you talked with at Illinois Bell misunderstood
>what you wanted. If you want to be able to use voice and data at
>the same time there must be two separate phone lines coming into
>the building.
>The only way to have two separate telephone lines is to pay whatever
>the local telephone charges. Some money can be saved by doing the
>in-house wiring yourself.


I think that is what she's saying.

Check the phone lines in your house - they are most likely 4-wire (red,
green, black, yellow).  If so, the job is trivial.  This is because you
only need two lines.  Your original phone line should use red and green.
You can use black and yellow for your second line.

The Illinois Bell installer will simply bring the two wires from the second
line to somewhere inside your house.  You just have to connect them to the
black and yellow (he/she might go ahead and do it).

The black should connect to a jack in the same way the green does, the
yellow will be like the red.  For info, the red/yellow is "ring" and the
green/black is "tip".  The incoming lines installed by the phone co. should
be same color code - if not, ask installer which is tip and which is ring.
They'll really think you know your stuff then :).

If you get them backwards, the phone will work, that is you will be able to
answer an incoming call.  But it won't dial out.  If this happens, just
switch the two wires around.

Hope this helps.


			Wally Blackburn AA8DX
			wrb@ccsitn.att.com
From: sef@drutx.ATT.COM (Scott E. Farleigh)
Newsgroups: sci.electronics
Subject: CD ROM and D.A.T. Sample Rates
Date: 12 Nov 92 18:06:14 GMT
Distribution: sci
Organization: AT&T, Denver, CO


I need the following information for a High School Science Fair
project.

1.  What is the sample rate and sample size for CD ROM's?

2.  What is the sample rate and sample size for Digital Audio Tape?

I am helping a student that is very interested in math. The idea is
to show that the difference in sample rates between CD's and D.A.T.
will not be much of an obstacle to a professional pirate. That is,
an interpolation algorithim, e.g. Legendare's, could be used to
convert between the two sample rates.

Thanks
Scott Farleigh
From: d89-ahg@ludd.luth.se (Anders Hedberg)
Newsgroups: sci.electronics
Subject: 12 V -> 3V, 0.6 A
Summary: Poratble CD player in a car.
Date: 7 Nov 92 14:15:50 GMT
Organization: Lule} Tekniska H|gskolas Datorf|rening - Ludd

A friend wants to listen to his CD player powered from the car.

The CD-player wanna have 3Volts at max 600 mA, and the car has a battery
of 12 volts.

I thought of a LM317 or something similar, but I've never designed something
alike, and I need to know how to calculate the resistor values.

/Anders Hedberg
From: kingpin@mole.gnu.ai.mit.edu (Joe Smooth)
Newsgroups: sci.electronics
Subject: HEX2ASM and ASM2HEX converters
Date: 9 Nov 92 17:53:17 GMT
Distribution: sci
Organization: None

I asked this a little while back, but does anyone know if there is
a program or programs available that will convert Intel HEX (8086) format
into .ASM format and vice-versa? I need this to edit programs burned in 
EPROMs.. Any help would be appreciated..

Also, I already checked Archie.. 

				Thanks...
From: Glen.Mead@f15.n229.z1.fidonet.org
Newsgroups: sci.electronics
Subject: Laser Diode Help Needed
X-Sender: newtout 0.02 Nov  5 1992
Date: 27 Oct 92  23:32:10

Hi All,

Is there anyone reading this who is familiar with the Sharp laser diodes
and laser diode driver IC's?  I need to build a visible laser beam
(approximately 2mW) which can be turned off and on by a TTL pulse.  Any
help would be greatly appreciated.

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--- FidoPCB v1.3 [ff053/x]
Newsgroups: sci.electronics
From: hacrat@CATFISH.LCS.MIT.EDU (Nate Osgood)
Subject: Dealer for strobe lights
Organization: MIT Laboratory for Computer Science
Date: Fri, 13 Nov 1992 15:03:54 GMT


Would anyone on this group happen to know of a source for purchasing
inexpensive  new or used bulbs for use strobe lights?

Any help greatly appreciated!

Nate Osgood


-- 
-------------------------------------------------------------------------------
Nate Osgood			| ARPA: hacrat@catfish.lcs.mit.edu
CS Graduate Student		| 
MIT LCS Room NE43-636		| UUCP: ...!uunet!catfish.lcs.mit.edu!hacrat
From: blair@dseg.ti.com (Art Blair 952-6341)
Newsgroups: sci.electronics
Subject: Re:    Low Pass Filter
Date: 9 Nov 92 22:08:37 GMT
Reply-To: blair@dseg.ti.com
Organization: Texas Instruments

Mini circuits is a good supplier of connectorized or PCB mount
low pass filters in that frequency range. I dont know the address
but they advertise very heavily in electronics mags like 'electronic
design', etc.
Newsgroups: sci.electronics
From: kevin@clsi.COM (Kevin Cameron)
Subject: Re: Inertial platform
Originator: kevin@dubhe
Reply-To: kevin@clsi.com
Organization: CAD Language Systems Inc.
Distribution: na
Date: Thu, 12 Nov 92 16:28:50 GMT


In article <92316.130725U60901@uicvm.uic.edu>, U60901@uicvm.uic.edu (Andrea Sterbini) writes:
> 
> The problem I want to solve is to take a topographic map of a cave.
> The inertial platform must be sufficently light to be hand-carried, it's
> possible to reset the platform every few minutes as a caver can put the
> object on the ground.
> 
> Obviously the budget is the more important constraint, I think that 1000$
> is the maximum price I can afford.
> 
> I you have any information that I can use, let me know.
>                              Andrea

You would probably be better off using standard survey equipment if you can get
it into the cave. I don't think you would be able to buy the parts for an
Inertial platform for $1000, let alone a working unit. I used to work for a
company that made such survey tools for oil-wells, the price was $?00,000.

Kev.


-- 
Kevin Cameron          CLSI, Suite 100, 5457 Twin Knolls Rd., MD 21045, USA
kevin@clsi.com         Tel: (USA) (410) 992 5700 (- 5709) X224
uunet!clsi.com!kevin   Fax:       (410) 992 3536
----------------------------------------------------------- Reality Is virtual
Newsgroups: sci.electronics
From: schaerer@isi.ethz.ch (Thomas Schaerer)
Subject: Re: 12 v -> 3v, 0.6 a
Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
X-Newsreader: TIN [version 1.1 PL6]
Date: Thu, 12 Nov 1992 08:30:15 GMT


S a v e    y o u r    C D - P l a y e r
=======================================

If you generate a stabilized voltage with a linear-mode- or switched-
mode-power-supply you are never shure if the circuit goes damaged in
worst case. About this you must think, because a CD-Player is an
expensive device. You shold save your CD-Player with an additional
power-zener of about 3.6V and a fast-fuse in serie of it.


	>--------- LM317 -|------ 1 Amp. Fast-Fuse -----|------->   
		     |    R1				|
  Car-Akku	     |----|    		        	-\ 3.6V    CD-Player
		    R2    				^
		     |    				|
	>-----------------------------------------------|------->

Ciao Thomas
Newsgroups: sci.electronics
From: mwandel@bnr.ca (Markus Wandel)
Subject: Re: Phone line monitor
Organization: bnr
Date: Mon, 9 Nov 1992 17:27:33 GMT

In article <16894F0EE.X1FT@VM1.CC.UAKRON.EDU> X1FT@VM1.CC.UAKRON.EDU writes:
> 
>I am installing the second phase of a house alarm system, and among other
>things, I want to report on the failure of a phone line.  After looking up
>the various voltages and polarities that exist depending on the status
>of the phone (on hook, off hook, ringing, etc), it seems that the simplest
>approach is to connect ring and tip to the to AC legs of a full wave
>bridge rectifier, then series a resistor (say 1k) with a small capacitor
>(say .5uf) across the DC legs, and monitor the voltage across the cap.
>Oops, add a 10k resistor across the cap to drain the charge, but not enough
>to load the phone line.  When it goes to zero, the phone company is no longer
>on the other end of the line.
> 
>Obviously, I want the existing phones to continue working as before, and this
>unit should not add any appreciable load to the phone line.
> 
>Am I missing something?  This seems simple enough to set up tonite.

11K ohms DC load is plenty of "appreciable load" on the phone line.  It won't
keep it offhook but it will make it fail any leakage test that is run on it.
I'm not sure what an acceptable leakage resistance is but it's very high.  I'd 
build a transistor amplified circuit that can couple to the line through
a 1M resistor to be safe.

Also whatever measures the voltage across your capacitor must be isolated from
local ground.  That means optical isolation or a relay or a transformer or
whatever.  I'd go for low-tech:  Battery power and a relay.  Circuit turns on
relay when tiny input current is removed.  Quiescent current so low that the
(alkaline) battery doesn't have to be changed more than once a year or so.

Make sure the circuit doesn't 'chatter' the relay when the 90VRMS/20Hz
sinusoidal ring voltage comes blasting down the line or when a pulse-dial
phone dials (high-voltage spikes occur).

Watch what happens when the nightly test hits your phone line.  The loop
voltage may disappear briefly as the test equipment is switched in.

Even then you may have a problem because an offhook phone can reduce the
voltage on your phone line almost to zero.  Say the phone has a DC resistance
of 100 ohms and draws 20mA:  Your loop voltage will drop to 2V.  There's no
lower limit.  That's why a lot of electronic phones just don't work
when someone else picks up an extension phone -- there isn't enough voltage
left to operate their electronics.

Anyway, observe the leakage and isolation precautions and at least the phone
company won't come after you, even if your circuit doesn't work.

I would have emailed except that I can't from here.  Available for private
ramblings at the e-mail address below.

Markus Wandel
markus@pinetree.org <-- NOT the source of this posting.
From: steuer@clam.rutgers.edu (robert Steuer)
Newsgroups: sci.electronics
Subject: Need Info on TopSPICE
Date: 6 Nov 92 05:38:24 GMT
Organization: Rutgers Univ., New Brunswick, N.J.

Hi, just wondering if anyone is using TopSpice from PENZAR
Development?  It is the only truly affordable spice package available
and the demo seemed pretty good, but does anyone have any actually
work experience with the program, ie any bugs, etc?
In case anyone wants the # for the demo disk, it is 1-800-272-0674.
Thanks!
-------------------------------------------------------------------------------
| Robert Steuer               Internet: steuer@clam.rutgers.edu               |
| Rutgers University          Amateur Radio: KF2EK@N3FOA.#EPA.PA.USA.NA       |
-------------------------------------------------------------------------------
Newsgroups: sci.electronics
From: norman@pagesat.com (Norman Gillaspie)
Subject: forsale 7.5 & 15KC 10.7Mhz crystal filters 8 pole
Keywords: filters crystals
Organization: Pagesat Inc.
Date: Thu, 12 Nov 1992 05:03:46 GMT

I have a fairly large qty of crystal and ceramic filters. From the response I
have had theese parts must be hard to get for the average experimenter ham etc.

	For a complete list plus specs. Please respond with a fax number.

	Norman	415-424-02380


-- 

------------------------------------------------------
Norman Gillaspie         norman.pagesat.com
(v) 415-424-0380 (fax) 415-424-0405       PageSat Inc.
From: cmh@eng.cam.ac.uk (C.M. Hicks)
Newsgroups: sci.electronics
Subject: Re: Op amp configuration question
Date: 6 Nov 92 12:11:28 GMT
Organization: cam.eng

ah335@cleveland.Freenet.Edu (Richard Banks) writes:


>I'm building a circuit where I need high gain.

>I was going to get two single op amps and send the output of one
>to the input of the other one.

>But would it be possible for me to just get a dual op amp IC
>and send the output of one to the input of the other on the same chip?!

Yes, a dual op-amp is identical with two single op-amps, just with shared
power pins. A dual may in fact be better, since the two amplifiers will
be at exactly the same temperature. It may be possible to use this fact
to reduce thermal drifts etc. - difficult to say without more info on the
specific application.

Christopher Hicks (cmh@uk.ac.cam.eng)
Newsgroups: sci.electronics
From: ejh@khonshu.colorado.edu (Edward J. Hartnett)
Subject: hooking up a phone's inside wiring, you know how?
Organization: CIRES, University of Colorado
Date: 10 Nov 92 14:21:19

Hi! I just ordered another phone line for my house so I can
tellecommute to work a few days a week, and you wouldn't believe what
US West is charging to come put the wiring in my house. However they
will hook it up to the house (leaving the inside wiring to me) for a
reasonable cost.


Now I am an electrical engineer, and I've even got a bunch of phone
wire sitting here. Can anyone out there tell me how to hook up my
wiring? I know it can't be too hard!

Please email, since I don't read this group. I'll summarize if there's
interest. 

Thanks.
--
Edward Hartnett			ejh@khonshu.colorado.edu