HDTenEightyP/NetNews huggingface dataset:
From: mac@cis.ksu.edu (Myron A. Calhoun)
Newsgroups: sci.electronics
Subject: Locate Printed Circuits International Inc.?
Date: 7 Apr 1992 00:01:57 GMT
Organization: Kansas State University, Dept. of Computer Science
Distribution: usa
NNTP-Posting-Host: depot.cis.ksu.edu

Does anyone know if the company PRINTED CIRCUITS INTERNATIONAL INC.
is still in business?  We obtained an "LCD CLOCK MODULE" and an
LCD DIGITAL VOLT-METER MODULE (DVM) from them several years ago
when their mailing address was in Sunnyvale, Santa Clara County, CA.
Over the years, segments of their LCDs have quit, and I'd like to
send them back to see if they can determine why.  But when I (try
to) telephone them with a number from a 1989 telephone book I get
a "not here" operator intercept, and "information please" doesn't
even show a phone listing for them in Santa Clara county any more!
--Myron.
-- 
# We preserve our freedoms using three boxes:  ballot, jury, and cartridge.
# Myron A. Calhoun, PhD EE; Associate Professor  (913) 539-4448 home
# INTERNET:  mac@cis.ksu.edu (129.130.10.5)      532-6350 work, 532-7353 fax
#      UUCP:  ...rutgers!depot!mac               W0PBV @ K0VAY.KS.USA.NA
From: wpns@pictel.com (Willie Smith)
Newsgroups: sci.electronics
Subject: Re: What's the correct cable for cable TV and baseband video?
Date: 7 Apr 92 21:15:51 GMT
Article-I.D.: pictel.1992Apr7.211551.942
Organization: PictureTel Corporation

In article <1992Apr2.183611.2614@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>In article <1992Mar30.151226.1035@eng.umd.edu> naiming@eng.umd.edu (Naiming Shen) writes:
>>
>>I want to install wires for cable TV and maybe used for baseband video
>>signal also.
>
>RG59 is 75 ohm cable for baseband video and CATV RF uses.

Umm, well, sort of.  CATV cable needs to have a full shield (foil is
good) for leakage considerations, and the frequency response should be
'good' from around 50 MHz to 500 MHz.  RG-6 is generally used.  RG-59
is not reccomended due to lack of shielding.

Baseband video needs to have a low DC resistance and a good frequency
response from 15 KHz to (something like) 5-10 MHz.  RG-59 is generally
used, though Belden 8281/9231 is reccomended for 'professional' use,
like studio wiring.  RG-6 tends to have a relatively high DCR, and is
not reccomended for use with baseband video.

To throw some more confusion into the discussion, BNC connectors for
8281/9231 are difficult to come by, unless you want to spend big bucks
for a crimp tool....  I'm going to have to wire our new house sometime
Real Soon Now, but I'm not sure _what_ to do....

Willie Smith
wpns@pictel.com
Organisation: Serco Space Ltd. @ ESOC
Date: Tuesday, 7 Apr 1992 15:59:30 CET
From: Jon <JBEST@ESOC.BITNET>
Newsgroups: sci.electronics
Subject: Re: pet peeve
 <1992Mar29.024555.24847@actrix.gen.nz> <56889@cup.portal.com>

> Chris_F_Chiesa@cup.portal.com writes...

> If you ever find yourself with a question outside your own level of
> expertise in any of the groups I contribute to <would insert list
> here>, look me up and I'll be happy to answer YOUR question 'even
> though you're not a regular reader' of MY groups."

I completely agree with these sentiments and was going to say the
same thing until Chris beat me to it! If someone asks a question and
I know, or can easily find, the answer - I'll reply and it makes no
difference whether they're regular readers of the newsgroup or not.

If someone has a query which is outside their normal areas of interest
why should they need to read a different newsgroup for x weeks to
receive replies? I thought the point of the net was to enable a free
flow of information, not isolate everybody in their own little groups
so that you have to be "one of us" before you can receive help.

I'm terribly disappointed....

   Jon
Newsgroups: sci.electronics,sci.physics
From: weigand@pecan.udel.edu (Steve Weigand)
Subject: Re: masers from magnetrons
Organization: University of Delaware, Newark
Date: Sat, 11 Apr 1992 13:44:59 GMT

In article <1992Apr11.064540.24694@mnemosyne.cs.du.edu> aankrom@isis.cs.du.edu (Anthony Ankrom) writes:
>
>  I have a large collection of magnetrons (yeah, from microwaves...). I am
>interested in making a maser out of these magnetrons. Could anybody lead
>me in the right direction to get this done? I don't really care if it's
>practical or not. I just want to do it. Any good books to recommend? Or 
>send me e-mail of schematics etc. (using ascii characters :)
>Thanx
>St. Anthony

Excuse my ignorance, but could someone explain what a maser is? I know
some laser theory if that helps.

- Steve Weigand
 (weigand@freezer.cns.udel.edu)
From: ferrick@acsu.buffalo.edu (Patrick K. Ferrick)
Newsgroups: sci.electronics
Subject: Help with motors wanted
Date: 12 Apr 92 19:45:34 GMT
Distribution: na
Organization: UB



I have a couple of motors that I'd really like to use, except
that I'm having some trouble figuring out how they need to be
hooked up.  Could someone out there please email me if you
can shed some light on this problem?

The motors are about 2" in diameter, 2" long, and were made
by Kearfott.  The sides bear the following diagram:	


    Frequency 400 cycles

  ___  Phase 1 115V ___
 |                     |
 |                     |
[1]        [2]        [3]
            |__________________

                               Phase 2
                               115V	
[6]        [5]        [4]______	
 |__________|           


I am fairly sure that the problem is in the 400 cycle bit,
the two phases, or both...but I'm not at all sure if I can
do anything about it!  I'd really appreciate any assistance
I can get...please reply via email if you wouldn't mind, as
I already subscribe to more newsgroups than I probably should!

Thanks,
pat
From: derek@slab.slip.uiuc.edu (Derek Taubert)
Newsgroups: sci.electronics
Subject: Good question about 1 bit A/D technology
Date: 14 Apr 92 07:43:17 GMT
Reply-To: dat33228@uxa.cso.uiuc.edu
Organization: Damage Inc.


Ok, I was thinking about this the other day, and some serious problems fell  
into my thoughts...

The master clock pulse for the Pulse Width Modulation portion of one of the  
Carver CD players runs at 33MHz.  If you consider that you are feeding a value  
to the initial stage of this converter every 1/44.1K seconds, then you would be  
left with 33M/44.1K different possible widths that a pulse could take on.

33,000,000 pulses/sec
--------------------- = 748.29... pulses / sample
  44.1 samples/sec

WHOA!  That's only 748 different pulse widths!  How in the heck do you get that  
to convert into an analog value that can take on 65536 different voltage  
levels?  Or, for that matter, how did you get a 16 bit value to shrink down  
into those 748 possible widths, that would then get translated to an analog  
signal that rivals direct A/D?  I understand the concept of reducing error by  
converting pulse width to analog voltage levels, but not with these numbers!

Or am I missing something here?

Derek
From: peter@opusc.csd.scarolina.edu (Peter Hoffman)
Newsgroups: sci.electronics
Subject: Re: Front panel finish
Date: 13 Apr 92 04:11:29 GMT
Organization: Univ. of South Carolina, Columbia

Purely coincidence but... Today a draftsman was showing me something
which may be applicable to this problem.  It seems that draftsmen use
something which is like rub-off letters but it is produced by a
copying machine (never say Xerox unless you want a nasty letter like I
got before).  In order to facilitate their work, they can do pieces of
the drawing on regular paper, copy them onto this stuff, and then do
rub-off transfers onto a single mylar sheet creating the single,
finished, drawing.

So, perhaps the answer is to laser print whatever you want, copy it
onto this stuff, and then rub it off onto the panel.  I do not know
what it is called off hand but it is about $20.00 for a box of 100
8.5"x11" sheets here in S.C. and it is available at blueprint supply
houses.

peter hoffman
peter@epoch.geol.scarolina.edu
Newsgroups: sci.electronics
From: danube@dirac.physics.sunsyb.edu (Dan Koller*)
Subject: Re: Repetitive clicks when playing tapes
Organization: Institute for Theoretical Physics, SUNY at Stony Brook
Date: Fri, 10 Apr 1992 18:10:09 GMT

In article <1992Apr7.202744.760@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>Do the clicks correlate with the rotation of one or the other of the
>little reels in the cassette?
>
>Do you get them when playing all tapes or only some?
>
>I've had clicks of this kind result from a tape being exposed to a
>magnet of some sort.
>
>-- 
>==========================================================================
>Michael A. Covington, Ph.D. |  mcovingt@uga.cc.uga.edu  |  ham radio N4TMI
>Artificial Intelligence Programs | U of Georgia | Athens, GA 30602  U.S.A.
>==========================================================================

  A possible source of the clicks is static discharge.  I once had a TEAC
tape, with two little aluminum reels inside the cassette shell.  When 
rewinding, the think acted just like a van de Graaf generator, producing
a discharge from one reel to the other!!!  I threw the cassette out 
immediately!  I suppose a bit of static buildup might occur in other
tapes at low speed, producing little clicks when a discharge occurs.
							Danube
Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware
From: pecampbe@mtu.edu (Paul Campbell)
Subject: Re: SIPP/SIMM hardware Connections: How is it done?
Organization: Degrading Chaos, unincorporated
Date: Fri, 17 Apr 1992 00:25:22 GMT

Okay, I don't know about emulating a SIMM, but both seem to have the same
pinout. Numerous people responded and filled in the details on some of the
stranger pins (and I lost all the names and addresses, so I can't give credit
where credit is do). The pins are as follows:

From the component side with the card/pin edge facing down, pin 1 is on the
left and 30 is on the right.

The pins are as follows:
 1 Vcc     6 IO2    12 A5     18 A9**   24 NC     30 Vcc
 2 *CAS    7 A2     13 IO4    19 A10*   25 IO8
 3 IO1     8 A3     14 A6     20 IO6    26 DOUT   **: NC on 256K SIMMs
 4 A0      9 GND    15 A7     21 *WE    27 *RAS   *: NC on 256K & 1 Meg
 5 A1     10 IO3    16 IO5    22 GND    28 *CAS
          11 A4     17 A8     23 IO7    29 DIN

What's up with the second *CAS line, the DIN, and DOUT's, since IO1-IO8
are obviously the bidirectional data lines? It turns out that generating
parity stuff is hard to do with just one data pin, so you got some extra
pins for bit 9 (if it is used). 

Compared to a regular 1 meg. or 256K RAM chip, I see no reason why you
can't fake SIMMs, but I can see why you wouldn't WANT TO. The price of
a 1 Meg. SIMM is roughly 35 FRN's, regardless of 8 or 9 bits. The
going price for 1 Meg. RAM chips seems to be roughly 4-5 FRN's. So the
SIMM's are cheaper and smaller. As far as power goes, I wouldn't assume
that they require any less power, but I can't see them drawing any more.
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Newsgroups: sci.electronics
Subject: Re: Color monitor problems; got a magnet near it by accident.
Date: 14 Apr 92 18:54:22 GMT
Organization: Hewlett-Packard, Fort Collins, CO, USA


> 
> switching the monitor on and off a few times should mend it.
> -- 

Note that this works (a) only if the monitor includes a built-in degaussing
coil, and (b) if it is left OFF long enough between cycles of the switch to
allow the degauss coil relay circuit (or whatever switching they use) to
discharge/drop out/whatever, so that it actually DOES come on at power-up
(listen for the buzz!).

Even then, internal degauss coils will NOT clear all purity problems; they're
simply not strong enough to do the job.  (They're really intended to keep the
"normal" build-up of magentism down.)  You will very likely have to get a
degaussing coil and perform a manual degaussing.

(The Voice of Experience Speaketh: When degaussing, bring ye not thy credit
cards, ATM cards, etc., near to thy coil, or passeth thy coil near to thy
wallet, lest ye be shunned by the Wizards of Electronic Finance forevermore!)


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Organization: Music, Carnegie Mellon, Pittsburgh, PA
Newsgroups: sci.electronics
Date: Mon, 13 Apr 1992 10:27:42 -0400 
From: "Raymond C. Chick" <rc4n+@andrew.cmu.edu>
Subject: Ohm's law for AC?

I record classical music and have recently begun to investigate the
affects of cable resistance on mic. level audio signals.  I used two
cables, one about 20' and the other about 350'.  I passed identical
signals through each cable and measured the  outputs levels for various
frequencies.  I found no difference in output level between the two
cables for frequencies from 100Hz. to 16Khz. Yet, the restistance of the
short cable was .5 ohms and the long cable was 5.5 ohms.

Shouldn't the long cable attenuate the signal or even roll of the high
frequencies?

How can I determin the maximum cable length before signal degradation begins?

Raymond Chick
Xref: sparky sci.electronics:8482 comp.sys.cbm:2371 comp.robotics:992
From: Jeff.Lindstrom@ofa123.fidonet.org (Jeff Lindstrom)
Newsgroups: sci.electronics
Subject: Tesla coils & ozone
Date: Sat, 11 Apr 92 04:11:14 PDT
Organization: Universal Electronics Inc. (Public access BBS)

U>Hi, aboust six monthes ago, I build a Tesla coil that, in my estimation put
U>out about 90,000 volts.
U>                   Stiletto

  I hope you are aware that Tesla Coils, Jacob's Ladders, and the like produce Ozone, which is toxic to us.  Use it in a well-ventilated area.

___
     Amiga MailMan v0.9


--  

Jeff Lindstrom
Internet: Jeff.Lindstrom@ofa123.fidonet.org
Compuserve: >internet:Jeff.Lindstrom@ofa123.fidonet.org
Xref: sparky sci.electronics:8525 rec.music.cd:4021 rec.audio:7431
From: nemeth@helix.Eng.Sun.COM (Les Nemeth)
Newsgroups: sci.electronics,rec.music.cd,rec.audio
Subject: Re: requesting CD player advice
Date: 15 Apr 92 01:22:53 GMT
Organization: Sun Microsystems, Mt. View, Ca.
NNTP-Posting-Host: helix

In article <1992Apr11.171059.4664@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>In article <ku9ldkINNh0l@exodus.Eng.Sun.COM> nemeth@helix.Eng.Sun.COM (Les Nemeth) writes:

>>A CD player can have .0001% distortion, but if it has a tinny sound who the
>>heck is gonna buy it. Probably the guy that doesn't take the time out to 
>>compare one player to the other...  Conversely, if another player has .001%
>>distortion but has a muddy sound, who the hecks gonna want it either. What
>>we are looking for is the one that sounds the most natural, regardless of
>>the distortion level, provided it's not around 10%.

>My dictionary defines distortion as a deviation from the orginal signal
>waveform. It doesn't define "muddy" in any useful way. When you get the
>same signal out of a recording that was put into it originally, that's
>no distortion. A machine with .03% total distortion is over 200 times
>more faithful to the orginal recording than a system with 7% distortion.
>Whatever "muddy" means, it has to show up in the total distortion figure,
>or you are describing the orginal signal, and there's no helping that.

What I was refering to was what I suppose would be termed as coloration
of the sound, not necessarily distortion. Or, does coloration show up as
some form of distortion? I think not... Something that has a warm sound
to it, could be considered to sound muddy. Just like something that has
cold/hard sound could be termed as tinny. In either case, you end up with
listener fatigue after only a short period of time. But, more so with 
the tinny effect.

Yes, I think a CD player can affect the way a certain CD sounds. It's all
in the electronics. And, even if it were to show up as distortion in the
specs, the amount of distortion would probably be a negligible amount. 
Maybe the amount of distortion present does have an effect on the resultant
sound. Like .0001 sounds too tinny, and .01 sounds too warm. Then I guess
what we need to do is find the happy medium. Maybe a CD player with variable 
distortion would be the answer.	That would be so that we could make up for
differences in the recording process.

/Les

--
-> Aragon,Camel,Edhels,Eloy,Enchant,Fish,Focus,FrozenGhost,Gabriel,
-> Genesis,Giraffe,Iskander,iQ,Kansas,ManfredMann,MarcJordan,Marillion,
-> Pallas,Parsons,Pendragon,PinkFloyd,Pulsar,Rush,Saga,SimpleMinds,Solaris,
-> TalkTalk,TearsForFears,Triumvirat,Tull,UK,Yes .......... nemeth@Eng.Sun.COM
From: Jeff.Lindstrom@ofa123.fidonet.org (Jeff Lindstrom)
Newsgroups: sci.electronics
Subject: Input protection
Date: Mon, 13 Apr 92 04:13:22 PDT
Organization: Universal Electronics Inc. (Public access BBS)

BJC>I am planning on building a digital tachometer for my truck.  For the input,
BJC>Since there are likely to be some rather large power spikes, I would like to 
BJC>know what kind of circuitry I would need to protect my TTL-level circuitry.

  Check out opto-isolators in a Digi-Key catalog.  Manufacturers are Harris, NEC, Isocom, Quality Tech., and Omron.

___
     Amiga MailMan

--  

Jeff Lindstrom
Internet: Jeff.Lindstrom@ofa123.fidonet.org
Compuserve: >internet:Jeff.Lindstrom@ofa123.fidonet.org
Newsgroups: sci.electronics
From: jim@rwsys.lonestar.org (James T. Wyatt)
Subject: Re: *** Thermal sensor needed.
Organization: R/W Systems, Richland Hills, Texas, USA, 76118-5849
Date: Sat, 11 Apr 1992 20:51:35 GMT

donohuej@woods.ulowell.edu writes...
>	I am a hang glider pilot and would like to design an instrument
>that locates thermals (rising hot air bubbles).  I have though of using
>fast temperature sensors, one on each wing tip, and letting software
>interpret the data in real time and recomend a left or right turn.  Can this 
>be done with infra-red or any other means?  The temp difference is only a 
>few degrees at best.  It must be light weight, run on batteries, and cost 
>less than $200 if possible. An imaging system that would let you visualy
>find thermals would be ideal but I don't think it is possible with the above
>restrictions. 

Easiest and most sensitive thing I can think of is a simple 4-R bridge
with 10K thermistors. Use one on each wing tip (small twisted-pair leads
work fine) for half the bridge. Use a 20K linear-tap potentiometer for
the other half of the bridge. Use a pair of D-cell nicads or so for power
and a sensitive analog meter for a null-detector. If you want to get
fancy, use an op-amp for better null detection. Just turn the pot until
the meter shows null and go. When the needle moves left, follow it. The
small panel meters can take a fair amount of shaking/jolting if there
is some shock isolation and it's *very* readable in daylight.

Thermistors usually have several ohms per degree change (sensitive) and
don't usually need amplifiers or special connectors/wire like thermocouples.
They are also about a buck, so order several for future projects... - jim
-- 
James Wyatt  KA5VJL  jim@rwsys.lonestar.org  Semper Gumbi - always flexible!
Newsgroups: sci.electronics
From: pnz46378@uxa.cso.uiuc.edu (Paul N. Zaremba (AA9BK))
Subject: Re: How do anti-theft systems in Shops work ???
Keywords: security shops theft
Organization: University of Illinois at Urbana
Date: Wed, 15 Apr 1992 09:02:33 GMT


I believe that it has something to do with non-linear junctions. 
i.e. diodes or transistors......
-- 
******************************************************************************* Your haggard, budding young electrical engineering student friend from Illinois Paul N. Zaremba / Amateur Radio Callsign AA9BK (After A 9th Beer, KILLED!)
Owner/Operator - RADIO TERRA AM 920! (Your local Part 15 Broadcaster)
My hate list: ECE270, PHYCS108, MATH285 (RENT THIS SPACE! Call (217) 332-4221)
*******************************************************************************
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Re: DS1267 dual digital potentiometer I.C. from Dallas semiconductor
Date: 9 Apr 92 03:35:32 GMT
Article-I.D.: doug.1992Apr8.223532.13215
Organization: College of Engineering, Univ. of Wisconsin-Madison

In article <1992Apr7.195910.8652@acsu.buffalo.edu> v064mb9k@ubvmsb.cc.buffalo.edu (Neil Gandler) writes:
>Has anyone used the DS1267 I.C. made by dallas semicomnductor in an
>application to control volume in a stereo. The data sheets given to me
>when I received three of these chips in the mail were not too helpfull.
>They gave no example circuit. I payed $18 plus shipping for three of these
>chips it would be a waste of money if I can't use them. Does anyone have
>data sheets on this I.C. that gives an example circuit or does someone
>know how I can use it. Its outputs are clearly described. Showing
>the output as if it were a real dual potentiometer. But the inputs
>are a reset pin, port data input/output and clock input.
>I would appreciate any help or suggestions
>  Thankyou

Well, the data sheets don't give any example circuits, but they do show
everything you need to know if you can hook up a regular potentiometer.
The data sheets, of course, come in Dallas's data book which can be purchased
for about $5 from Newark.  You could probably talk Dallas into sending you
either the entire data book or the sheets you need if you convince them you're
a Real Engineer.  (I talked to one of their engineers once about a DS5000
problem... nice people!)

If you don't like this approach, I can fax them to you if you like.

Someone already mentioned that for audio applications you need a log pot.
On the other hand, you can mess around with paralleling resistors and get
something that's pretty close to looking like a log response.

The DS1267s we have were used to automate some electron diffraction boxes
that used to have you set some amplifier gains by hand.  Now the computers
set the gains...

						---Joel Kolstad
						kolstad@cae.wisc.edu
From: francis@ircam.fr (Joseph Francis)
Newsgroups: sci.electronics
Subject: Ethernet Pocket Adapter Re: How do I access the parallel port?...
Date: 6 Apr 92 13:34:45 GMT
Organization: IRCAM, Paris (France)

In article <JVP.92Apr3171113@curan.juliet.ll.mit.edu> jvp@juliet.ll.mit.edu ( Jim Pieronek ) writes:
>In article <freyer.61@hauk.hsr.no> freyer@hauk.hsr.no (Freyer, Stle)
>
>   [snip]
>
>   I would like to make the best out of the two, and use a PCD8584 
>   IIC controller connected to the parallel port instead of the AT bus.
...
>The PC parallel bus is very easy to access and in most cases is
>uniform across all PCs, certainly for the "documented" lines.  It is
...
>This message is coming to you via an ethernet adapter that runs over
>the parallel port on my notebook.  I've clocked it at 35kBytes/second.

Wow! I completely forgot that these existed. I would love to wire all
the PC's in the apartment (several, and a Sony Laptop which already
has ethernet) to use the Laserjet over Ethernet with this. Is that
possible with them?

-- 
| Le Jojo: Fresh 'n' Clean, speaking out to the way you want to live
| today; American - All American; doing, a bit so, and even more so.