HDTenEightyP/NetNews huggingface dataset:
From: craig@kralizec.zeta.org.au (Craig Dewick)
Newsgroups: sci.electronics
Subject: Re: M68HC11 multidrop network (RS-485?) routines needed
Date: 21 Jan 1993 11:23:01 +1100
Organization: Kralizec Dialup Unix Sydney: +61-2-837-1183 V.42bis
NNTP-Posting-Host: kralizec.zeta.org.au

laird@stable.ecn.purdue.edu (Kyler Laird) writes:

>I'd like to set up some 6811's for "home control".  I'm thinking that
>I'll drop eight pair UTP cable around the house, but two pairs would
>be for Ethernet, another two for telephone lines, and one more for 12
>or 6VDC (which the 6811's could run off of).  So, I'd have three pairs
>free - hopefully this will avoid the necessity of fancy line sharing
>protocols.  (I wouldn't mind just using one pair and having two free,
>though.)

Hmmm, have you seen the Circuit Cellar Home Control System? Those who
used to read Ciarcia's Circuit Cellar in Byte will know that he
started his own mag called Circuit Cellar Ink.

They have developed a new home control system, which is based around
a multidrop RS485 network. You might like to check this out and see if
anything to do with the project is applicable to what you're trying to
do.
-- 
 Craig Dewick, Station Master, Possum Power Tank BBS. +612-544-1060 (ringback).
    Send electronic mail to craig@kralizec.zeta.org.au, flames to /dev/null.
                      - Railway Preservation Industries -
          Supporting the Preservation of Australia's Railway Heritage
From: cmwolf@mtu.edu (christopher m. wolf)
Newsgroups: sci.electronics
Subject: 64 Bit Sun
Date: 25 Jan 93 18:19:35 GMT
Organization: Michigan Technological University
X-Newsreader: Tin 1.1 PL5


Has anyone heard about the 64 bit Sun?  What can you tell me about it?
-- 
------------------------------------------------------------------------------
Christopher Wolf             Electrical Engineer                cmwolf@mtu.edu
------------------------------------------------------------------------------
"I read of one planet off in the seventh dimension that got used as a
Newsgroups: sci.electronics
From: crisp@netcom.com (Richard Crisp)
Subject: Tracor Model 308A Rubidium freq standards for sale
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Thu, 28 Jan 1993 02:33:49 GMT

I have two Tracor 308A rubidium frequency standards for sale. They work well,
lock up etc. I haven't checked against VLF, but these are well made units 
in good condition and appear to work normally.

They produce a 5mhz, 1 mhz and 4.94mhz signal. Included is a reproduction
of the operating/repair manual. The price is $500 each. Or trade???

I am always interested in first rate test gear, and radio equipment such as
shortwave and wideband receivers etc.
-- 
Richard Crisp                 Cupertino, Ca.                crisp@netcom.com
(415) 903-3832 wk                                         (408) 253 4541 fax
Newsgroups: sci.electronics
From: daylmer@nyx.cs.du.edu (David Aylmer)
Subject: WEKA Electronics Repair Manual
Organization: Nyx, Public Access Unix @ U. of Denver Math/CS dept.
Date: Tue, 26 Jan 93 05:15:33 GMT


I just got an ad/letter from WEKA Publishing advertising their 
"Electronics Repair Manual" which supposedly has info on how to fix 
all sorts of different electronic devices.  It costs $60 and looks
fairly large.

My question is: is it any good?  Is it worth the price?
If anybody has seen this manual please tell me what you thought of it.

Thanks,
daylmer@nyx.cs.du.edu
From: slezal@gyro.ECE.ORST.EDU (Lee Slezak)
Newsgroups: sci.electronics
Subject: Arcom Cable Filters
Date: 27 Jan 1993 00:33:09 GMT
Organization: none
Distribution: world
NNTP-Posting-Host: gyro.ece.orst.edu

Does anyone know where to purchase those inline Arcom filters
for cable telvision?   Basically what they are, is an inline 
filter that descrambles a specific channel number.  Not necesarrily
the spcific channel but the channel #, i.e. : 1, 5, 11 etc...


Thanks -

Lee
From: louis@cpd.Tandem.COM (Louis Meadows)
Newsgroups: sci.electronics
Subject: Need ARC "Interkey" schematic/manual
Date: 25 Jan 93 18:20:12 GMT
Organization: Tandem Computers Inc., Cupertino CA


 Hi,

 I am looking for information on a old Alantic Research Datascope called
the Interkey/Interview/Intershake
 
  Thanks in advance,

         Louis
From: cstadbg@csv.warwick.ac.uk (Mr M J Brown)
Newsgroups: sci.electronics
Subject: Re: Heat gun pcb cannabalization
Date: 26 Jan 1993 16:13:35 -0000
Organization: Computing Services, University of Warwick, UK
NNTP-Posting-Host: lily.csv.warwick.ac.uk
Keywords: Heat gun, charring, lack_of_skill, try_again_maybe

In article <651@rins.ryukoku.ac.jp> will@rins.ryukoku.ac.jp (William Reiken) writes:
>
>	I was told that microchips will be damaged if you use this approach.
>Does it really matter?
>
>							Will...

I have never found a chip to be damaged by this approach. I think it is
actually more destructive using a soldering iron, as the heat is prolonged.
With the gun it takes seconds to remove, unlike a solder iron/sucker

=============================================================================  
     _/      _/   _/   _/  _/   _/_/_/_/   |
    _/_/  _/_/   _/   _/_/     _/          |         Michael Brown
   _/  _/  _/   _/   _/       _/_/         |
  _/      _/   _/   _/_/     _/            |   cstadbg@csv.warwick.ac.uk
 _/      _/   _/   _/  _/   _/_/_/_/  _/   |     mjb@dcs.warwick.ac.uk
                                           |    csulo@csv.warwick.ac.uk
=============================================================================
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Mother of all HeNe's for sale
Date: 28 Jan 93 18:24:25 GMT
Organization: University of Kansas Academic Computing Services

I just got a lead on the mother of all HeNe's. This guy is a Jodon
HN-50 producing +50mW ! ! The tube was replaced in 1989 and it has
very low hours on it. The laser comes with a Jodon digital power meter
and the power supply as well. The cavity has an etalon prism for tuning
in the 1192Nm and 3390Nm (IR) range. It is also open cavity design.
The overall unit is in excellent condition. The guy wants $4,000 or
best offer for it. The ultimate light show or holography laser !

-=-= Wes =-=-
From: gerald.belton@ozonehole.com (Gerald Belton) 
Newsgroups: sci.electronics
Subject: Hard Disks: Toss them out
Date: 25 Jan 93 13:21:00 GMT
Distribution: world
Organization: The Ozone Hole - SKYDIVE New Orleans! - (504)891-3142 16,800 bps
Reply-To: gerald.belton@ozonehole.com (Gerald Belton) 

>The hard disks tend to last about three years before they start to go bad.
>Historically, we've just tossed them out and replaced them. We've not bother
>with doing a low-level format or otherwise trying to restore them to health,
>the rationale being that the replacement costs are low and extracting anothe
>six months or so of life isn't worth the bother.

>I'd like to know if this is a sensible policy? What actually goes bad in the
>drive? If the bearings and mechanical parts are actually good for many years
>then perhaps we're being wasteful by throwing them out and, instead,
>should just reformat them every few years and keep on using them? I've seen
>software adverstised that claims that we should do this, but I've no idea ho
>good it really works?  I'd sure appreciate any knowledgable advice. Thanks.

I think you should definitely continue tossing them out.  In fact, I'll
e-mail you my address and you can send them to me when you toss them
out.  :^)

---
 . SLMR 2.1 . Hello, I am part number ................
                                                                                                                         
----
+=====================================================================+
| The Ozone Hole - SKYDIVE New Orleans! - (504) 891-3142 HST/DS 16.8K |
| 3 Nodes <> USA Today <> Boardwatch Online <> 10 Gigs <> 73900 Files |
+=====================================================================+
From: cmh@eng.cam.ac.uk (C.M. Hicks)
Newsgroups: sci.electronics
Subject: Re: Digital Filtering
Keywords: Digital Filter software
Date: 25 Jan 93 09:57:09 GMT
Organization: cam.eng

fitzpa@eeel.nist.gov (Gerry FitzPatrick) writes:

>I need to design a digital filter (either a notch filter or
>a low-pass filter).  I will be analyzing data taken from a 
>lecroy 7200 scope (in either ascii or binary).  I would like
>I would like to look at the 60  Hz component of the waveform.

>Any ideas on how to write a subroutine that would perform this
>digital filtering on stored data?  Any good books on designing
>digital filters?

'MatLab' from Mathsworks would be absolutely ideal, although rather expensive.
It is a data manipulation, analysis, and computational package, which has
built-in routines for digital filtering, spectral analysis and graphical
output (amongst many hundreds of other things). Runs on a 386 or better
(and many other platforms such as NeXT, UN*X), but I think it requires a 
co-processor. It will, undoubtedly, do everything you need, but maybe costs
too much...

If you want to write your own routines, then the problem has two parts:
   i) designing the filter
  ii) processing the data

Numerical Recipies in C/Pascal/Fortran by Press, Flannery and others probably
contains most of what you need - but look before buying it, as this is from
memory :-)

Christopher Hicks

--
 ==============================================================================
 Christopher Hicks    |    If it doesn't fit...
 cmh@uk.ac.cam.eng    |                        ...you need a bigger hammer.
 ==============================================================================
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Tone arm for child's phonograph
Organization: AI Programs, University of Georgia, Athens
Distribution: usa
Date: Thu, 28 Jan 1993 01:42:03 GMT

Where can I get a replacement tone arm (containing ceramic cartridge) for
a child's phonograph?  This used to be a very common item, but neither
MCM nor Parts Express nor Radio Shack now has it.  Does anybody know of
a supplier that actually does still sell these?  Maybe a surplus place?

-- 
:-  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 :  ** *** **
Xref: sparky sci.electronics:23474 rec.audio:19513 rec.audio.car:5869 rec.audio.pro:2866
From: elkinbar@filly.EBay.Sun.COM (Greg Elkinbard)
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
Subject: Re: 12V Power Amplifier Design
Date: 26 Jan 1993 23:58:33 GMT
Organization: Sun Microsystems Federal, Inc.
Distribution: world
Reply-To: elkinbar@filly.EBay.Sun.COM (Greg Elkinbard)
NNTP-Posting-Host: filly.ebay.sun.com

What you need is a switching power supply.  You can pick up a Radio Shack
book on how to build one.  It is not difficult to build.

Greg
=========================================================================
Greg Elkinbard                       # aka Lord Cromis the DragonSlayer
elkinbar@cromis.EBay.Sun.COM         # or gregory.elkinbard@Ebay.Sun.COM
=========================================================================
Newsgroups: sci.electronics
From: jasa@dalton.inesc.pt (Jose Antonio Soares Augusto)
Subject: Re: simulation of a gate oscillator start-up
Organization: INESC, Lisboa Portugal
Distribution: sci.electronics
Date: Tue, 26 Jan 1993 17:40:37 GMT

I have colleagues working on Microwave Oscillators that reported some
difficulties working with PSpice, mainly when the Q factor of the
resonant element is too high (some thousands).

However, there is a kind of simulation software designed to achieve,
quickly and precisely, the forced response of nonlinear oscillator
circuits, using techniques known as "Harmonic Balance Techniques" that
can handle oscillators, power amplifiers, frequency multipliers, etc.

I've worked in Microwave frequency doublers using a software called
"Microwave HARMONICA" with very good results but only once in a Master
Degree work. People from Microwaves Group at my University are using
also a system from HP known as "Microwave Design System-MDS". I think
that the company that sells TOUCHSTONE has also some software for that
kinf of problems.

Some months ago, in IEEE SPECTRUM, appeared a broad description of
many CAD Software for Electronics with the companys address given.

BY THE WAY I HAVE NOT COMERCIAL RELATIONS WITH ANY OF THE COMPANIES
THAT SELL THE ABOVE MENTIONED SOFTWARE.

	Hope this helps...
		J. Augusto

  
Newsgroups: sci.electronics
From: kong@leland.Stanford.EDU (Kong Kritayakirana)
Subject: Where can I order quantity-1 Motorola DSP56001 chip
Organization: DSG, Stanford University, CA 94305, USA
Date: Tue, 26 Jan 93 21:21:49 GMT

Hello Netters:

I'm working on a school project and need one of the Motorola DSP56001
badly in a very short period of time. Any recommendation about how
to order 1 and have it shipped to me ASAP will be GREATLY appreciated.

Please respond by email

Kong Kritayakirana (kong@leland.stanford.edu)

Newsgroups: sci.electronics
From: regmad@gsusgi2.gsu.edu (Michael de Kraker)
Subject: Re: 9 or 12 VDC Flasher Circuit
Organization: Georgia State University
Distribution: usa
Date: Thu, 21 Jan 1993 22:29:05 GMT

pprun@august.it.uswc.uswest.com writes:


>I want to build or buy a relatively cheap flasher.  I want to flash
>an LED between 1 & 2 times/second.  I could use either 9 or 12 VDC (don't
>ask why - it's a long story).  Either a parts list, maybe with the pin
>outs, or a phone number for a catalog would be appreciated by this
>software engineer (hey, this is a *hardware* problem :-)


>Pete Prun
>pprun@lookout.mnet.uswest.com


  LM3909 - Led flasher IC cost about $1 ( I think RS still sells this )
           Requires external capacitor which controls the flash rate and
	   will flash for months on a AA cell.

  Flasing LED - Led with built-in flashing component. about $2 (RS also)
   
     _______  ______
    /        /        /       /    Michael A. de Kraker
   /        /______  /       /     Georgia State University  404-651-2390
  /    ___        / /       /      Internet:REGMAD@GSUSGI2.GSU.EDU
 /_______/ ______/ /_______/       BITNET  :REGMAD@GSUVM1  PACKET:KD4FKW@W4QO
 
   To iterate is human, to recurse devine
From: pjw@col.hp.com (Peter Walsh)
Newsgroups: sci.electronics
Subject: Re: Uneven microwave cooking ... why?
Date: 27 Jan 93 19:30:54 GMT
Organization: HP Colorado Springs Division
NNTP-Posting-Host: hpctdkr.col.hp.com

ornitz@kodak.kodak.com (Barry x24904/ER/167B-TED) writes:
> In article <1993Jan26.125656.29958@doug.cae.wisc.edu> kolstad@cae.wisc.edu 
> (Joel Kolstad) writes:
> >Microwaves are tuned to heat up water most effectively, so things with
> >little water in them (i.e., non-microwave popcorn) don't cook well.
> 
> I agree with almost everything said but this.  Microwave ovens are NOT
> specifically tuned to any resonant absorption frequency of water.  Water
> happens to be a good absorber over a broad range of frequencies.  The choice
> of 2.45 GHz (in the US) for the operating frequency of home microwave ovens is
> more an economic one and one dictated by international agreements.  915 MHz
> is often used industrially in the US, and a myriad of other frequencies are
> used in foreign countries.
> 
> This is a common misconception, and one that even tends to be propagated by
> physics professors who should know better.  Water absorbs considerable
> energy at frequencies used in microwave ovens, but so do many other materials.
> 
> For those who want further references, the best I can suggest is "Microwave
> Spectroscopy" by Charles Townes and Arthur Schawlow. [Remember that before
> the laser came the maser which was an offshoot of Townes work with microwave
> spectroscopy!]
> 
> Let's kill the myth that microwaves heat only water and that the frequency is
> a special one that resonates with water molecules.
> 					Barry
>  -----------------
> |  ___  ________  |    Dr. Barry L. Ornitz          WA4VZQ
> | |  / /        | |    Eastman Chemical Company
> | | / /         | |    ECC Research Laboratories, Engineering Research Div.
> | |< < K O D A K| |    Process Instrumentation Research Laboratory
> | | \ \         | |    P. O. Box 1972, Building 167B
> | |__\ \________| |    Kingsport, TN  37662  (615/229-4904, FAX 615/229-4558)
> |                 |    INTERNET:   ornitz@kodak.com
>  -----------------


I agree, adding almost anything to water causes it absorb more energy and
heat faster. Try a glass of tap water and a glass of tap water with 3 Tbs
of sugar in it, I'm sure the sugar water will heat faster. The fat content
of foods also affects the max. temperature that can be acheived. The
manufacture of RubberMaid products states that high fat foods when
microwaved in their products can blister the plastic on the inside of
the container.
 As far microwaves heating unevenly, *they don't*, its just that the food,
depending on its shape, density, fluidity, etc. do not dissapate the head
evenly and consequently hot spots form (from experience you will find that
a hot spot will never form in the center of food object being heated).

Peter Walsh
Hewlett Packard
pjw@col.hp.com
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: XILINX XC2064-50
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Thu, 21 Jan 93 11:39:02 GMT

Lau Hui King (doslauhk@nusunix1.nus.sg) wrote:
: Hi, anyone out there who can help me with these parts?
: XILINX XC2064-50
: MAX633ACPA
: I really have no idea what these parts are, would appreciate if anyone
: could tell me where I get it or where to get info.
: Thanks 
: Mr Lau Hui King
: National University Singapore



There is a very handy reference available called IC Master.  The ancient set
that I had was a two volume set with supplements; I believe the current set
is in four volumes plus supplements.  It should be available at your univer-
sity's library.  If not, you may be out of luck because they are very 
expensive, very few people privately own them; their cost is even prohibitave
to some corporations.

If you can't find an IC Master try calling/contacting a local electronics
distributor.  They're usually pretty helpful, especially if they think there
is a sale coming out of it.  Lastly, you may try contacting the manufactuter
directly; if they don't know, nobody will!

Good luck!


Jerry

"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues



: 
Xref: sparky sci.electronics:23176 misc.consumers.house:17226
From: barker@wd0gol.WD0GOL.MN.ORG (Bob Barker)
Newsgroups: sci.electronics,misc.consumers.house
Subject: Home alarm system supplies
Date: 21 Jan 93 14:54:57 GMT
Followup-To: poster
Organization: Robert Barker & Associates, Eden Prairie, MN.

I'm in the process of building a new house and would like to install an
alarm system myself.  I'm looking for information about suppliers of
home alarm components - like controllers, keypads, weight sensors,
motion sensors, sirens, etc.

I'm familiar with what Radio Shack offers, but I'm looking for a supplier
that has more to choose from.

Any company names or phone numbers would be very helpful.  Also any
advice from others on what to do or not to do would be appreciated!

Thanks,

-Bob
------------------------------------------------------------------------------
Bob Barker                                ...!uunet!umn-cs!tcnet!wd0gol!barker
Robert Barker & Associates                                barker@wd0gol.MN.ORG
(612) 949-0140
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Where do I get a Maxim Max 232 CPE chip?
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Fri, 22 Jan 93 11:46:41 GMT

Terry L. Cary (TLC112@psuvm.psu.edu) wrote:
: 
: New at this game, outside of the local electronic repair shop and radio shack,
: I have no idea where to look...  I'm tying to build a RS 422 converter for the
: Casio SF-8000 to a Macintosh.  Suggestions anyone?



Terry-

Try your local Hallmark (no, not the card people), Hamilton-Avnet or Newark Distributors.
They should be listed on your local Buisness Yellow Pages.  I would try Hallmark first,
I've gotten MAXIM products through them before.


Jerry

"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues



Newsgroups: sci.electronics
From: lan_lada@rcvie.co.at (Marino Ladavac)
Subject: Re: What good are mylar capacitors?
Organization: Alcatel Austria Informatik R&D, Vienna, Austria
X-Newsreader: Tin 1.1 PL4
Date: Thu, 21 Jan 1993 15:45:07 GMT

garland@ohstpy.mps.ohio-state.edu writes:
: Here's an elementary question about capacitors that I'm almost too embarrassed
: to ask. Many audio circuits I've seen specify mylar, polystyrene, or paper 
: capacitors in the .01uF-.1uF range.  Is there some advantage these types of
: capacitors have (e.g., lower noise, more stability) over disk ceramics or
: silver micas? For instance, I got a bag of .01uF 400V mylar capacitors on
: close-out from a local parts distributor, but am not sure what I should use
: them for. Presumably, their self-inductance is too high for rf circuits, where
: I would normally use ceramics or micas, but are they suitable for general
: purpose bypassing, etc. of power supplies, op amp, and TTL circuits? Are they
: OVERKILL for such uses (i.e., is their temperature coefficient, tolerance, etc.
: so good that I'm wasting them for such applications?)  I'd appreciate any
: guidance. Thanks.
: 
: jim Garland
:  
:        
 
Sorry, I'm no expert either, probably shouldn't be posting this, but, here it
goes anyway ...

The MYLAR's themselves aren't really that much better than the polystyrene
capacitors. What the diagrams want to say is that one shouldn't use the
ceramic capacitors, since, for those capacities they can only be made of
Type III ceramics, which is non-linear. 

Personally, I would bypass the digital IC's with Type III ceramics, because
they are usually cheaper and smaller than the foil capacitors (MYLAR, poly, 
etc.) but would prefer the latter wherever the analog signals are involved.

The foil capacitors are usually employed in filter circuitry - again, for
their linearity - but, basically only in the AF range, because of their
inductivity.

I hope this helped.

Alby.
Newsgroups: sci.electronics
From: szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983)
Subject: Re: Voltage drop across 1N4148 diode?
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Fri, 22 Jan 93 10:12:19 GMT

scottcr@wkuvx1.bitnet wrote:
: In article <1993Jan21.101200.8651@mr.med.ge.com>, szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983) writes:
: 
: > The voltage drop across the 1N4148 diode depends on what type of
: > semiconductor material it is made of.  If the diode is made of
: > germanium (no, not the flowers) the drop is around 0.7V;
: 
: What? lets try .2 -.3 for Germanium.
: 
: > if it
: > is made of silicon then the drop is around 0.5V.
: 
: How about .6 - .7   ?
: > 
: > The 1N4148 is usually used in computer applications and most
: > general purpose circuit board applications where small currents
: > are used.  I agree that the 1N4001 would be a better diode for
: > this particular application.
: > 
: > 
: > Jerry
: > 
: By the way, a 4148 (at least used to be) silicon.



O.K., people, I made a mistake.  I knew that there was a difference in
the voltage drops between germanium and silicon diodes, I just didn't
remember which went with which.  Sorry.

But I have seen/used germanium 1N4148s.  I was working on some military
applications a couple of years ago, so the germaniums might be MIL-spec'd.
If my memory serves me right there is a physical size difference between
the two, but I don't remember which is which.


Jerry

"It riles them to believe that you perceive the web they weave and keep on
thinking free!"  --  Moody Blues


: --