HDTenEightyP/NetNews huggingface dataset:
From: hk0w+@andrew.cmu.edu (Hanjoon Alex Kim)
Newsgroups: sci.electronics
Subject: M68HC11 info needed
Date: 27 Aug 92 01:17:40 GMT
Organization: Junior, Mechanical Engineering, Carnegie Mellon, Pittsburgh, PA

Hi, thanks for reading this.
I have no idea what kind of responses I'll get, since this is my first posting.
I am currently working on a project which involves the Motorola 68HC11.
Now, I ran into a problem with the Mac. The Mac C compiler for the 68HC11 that
I have does not like to divide numbers or deal with floating points. And, 
being a student, I don't have the money to buy a compiler that does. Do you
know of any solutions to my problem? Maybe a cheap (~$20) compiler out there
for the Mac? Or a way around my problem?
Thanks in advance for any help you may be able to give me.

Alex
From: Rick.Ellis@ofa123.fidonet.org
Newsgroups: sci.electronics
Subject: Re: Need encoding scheme for TV remote infrared controller
X-Sender: newtout 0.02 Aug 21 1992
Date: 03 Sep 92  18:51:18

On <Sep 02 18:51> Keith Mancus writes:

 >>  (2) Is the encoding scheme standardized?

 > Not by a long shot.

 KM>   Odd.  I've seen "generic" controllers that can be programmed to
 KM> drive a wide variety of remote-controlled devices.  It seems pretty
 KM> difficult to do this w/out any standards!

Yes, it is difficult.  ;-)
Newsgroups: sci.electronics
From: massoud@chemteca.sdsu.edu (Massoud Ajami)
Subject: Re: PGA package ZIF -> wire-wrap??
Summary: Do they exist?
Keywords: PGA ZIF wire-wrap
Organization: San Diego State University
Distribution: usa
Date: Wed, 2 Sep 1992 17:50:24 GMT

In article <180q4pINNkns@darkstar.UCSC.EDU> aaronf@cse.ucsc.edu (Aaron T. Ferrucci) writes:
>From: aaronf@cse.ucsc.edu (Aaron T. Ferrucci)
>Subject: PGA package ZIF -> wire-wrap??
>Summary: Do they exist?
>Keywords: PGA ZIF wire-wrap
>Date: 1 Sep 92 22:16:57 GMT
>I am working on a project which uses some very expensive PGA package
>parts. I would prefer to use ZIF sockets to save wear and tear on the
>package pins. The initial prototype is going to be made using
>wire-wrap, but so far, I haven't been able to find a company which sells
>wire-wrap lead ZIF sockets. Does anyone know of such a company? 
>
>On the other hand, I'd be interested in hearing peoples' creative 
>solutions to this problem. I realize that most hobbyists probably don't
>need to use PGA packages very often, but someone out there in the "real 
>world" must have solved this problem. If there is interest, I'll post 
>a summary of responses in about 2 weeks.
>
>thanks,
>Aaron Ferrucci (aaronf@cse.ucsc.edu)

Get Lo-Profile IC Socket Pin , Wrap Post (perhaps from Digi-Key, PN. V1058-
ND, $16.00/Pkg of 100), populate PC board with them, then inset ZIF socket.



Peace and Prosperity!
  ---==< 110 >==---
From: mycal@netronix.com (Mycal Johnson)
Newsgroups: sci.electronics
Subject: GPS Availability 
Distribution: world
Date: Fri, 28 Aug 92 16:36:10 GMT
Organization: Netronix, Inc.


In article <Bto0zD.Mor@vcd.hp.com> johne@vcd.hp.com writes:

  > 
  > David Lesher (wb8foz@skybridge.SCL.CWRU.Edu) wrote:
  > : Others said
  > : # Nope.  Selective Availability (the deliberate pseudorandom "fuzz"  >  introduced
  > : # by the DoD) is very much back in force.  Pity.

When everyone is talking about ballistic missles, why not use GPS with
a cruse missle?  There are plenty of drone designs that are built around
non-ferrous materials, you could even use plywood.  Use a vw motor for
a power plant, paint the sucker black and fly it at night.
So what if the thing only goes 90mph,  at 500ft it would be virtually
undetectible.   And It would be cheap, save the GPS unit.



-----------------------------------------------------------------------------
                                     ?
Pirate Radio?  Whats that?        @ o o @                mycal@netronix.com
                                     O

                            Just Say Know to Drugs.
Newsgroups: sci.electronics
From: butts#@shocker.ee.twsu.edu (Ronald W. Butts -SUPER ACCT)
Subject: Wanted: Low power RF transmitter modules
Organization: Electrical Engr. Dept, Wichita State Univ.
Date: Fri, 28 Aug 1992 01:06:01 GMT
X-Posted-From: gegan1.ee.twsu.edu
X-Posted-Through: sol.ctr.columbia.edu

Hello all,

For a device I am building, I will need to transmit 5-9 voice signals to 
portable remote receivers approximately 100m away with relatively noise-
free reception. Rather than pain myself with the gory RF details, I hope to 
locate a source for a device capable of transmitting 5-9 audio (4KHZ 
bandwidth is OK) signals simultaneously. Ideally, it should be US FCC 
approved. 

As an alternative, I may be able to make due with several single-channel 
transmitters, provided the aggregate cost is not too high. 

Also, since an off-the-shelf solution may be found, I would 
appreciate any suggestions on suitable frequency bands, field strengths, 
etc. that would be appropriate for the situation. I have US FCC (part 47) 
regulations on order--they may be of some guidance, too. The transmitter 
will be stationary, and will be used in an industrial environment.

Reply to either this list, or privately to my email address:

butts @ shocker.ee.twsu.edu

I will summarize private responses and post.

Thanks.

Ronald W. Butts,
Electrical Engr. Dept
Wichita State University
From: burris@ennex1.eng.utsa.edu (John Burris)
Newsgroups: sci.electronics
Subject: Jobs
Date: 2 Sep 92 15:55:20 GMT
Reply-To: burris@ennex1.eng.utsa.edu (John Burris)
Organization: Univ of Texas at San Antonio

Sorry for posting this in here, but it seems to be the best category.  I'm  
looking for an electronics test engineering position.  I have almost 2  
years experience in the development of test programs and hardware for  
fault isolation in circuit card assemblies using the GenRad 1796.  Any  
suggestions?
From: frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger)
Newsgroups: sci.electronics
Subject: Re: Humidity Sensor Needed (Cheap!!!)
Date: 4 Sep 92 15:56:00 GMT
Reply-To: frank@rover.uchicago.edu
Organization: Joint Center for Radiation Therapy
News-Software: VAX/VMS VNEWS 1.41

>>>> Can anyone out there help me with my search for something to use as an
>>>> electronic relative humidity sensor.

	Suddenly remembered that for a high-school science project, I
	did a circuit out of radio-electronics to turn off a de-humidifier
	at the appropriate time. Detector was a variable resistance in the
	grid circuit of a 2050 thyratron.

1	Take one box, plastic, approximately the size of the box greeting
	cards come in. Remove the top.

2	Mount 2 banana plugs in the box, about 3 inches apart. Leave the
	threaded parts sticking up into the box, plug parts sticking down.

	|______||________||_______|	<-- cross section looks like this
               ()        ()

3	Fill box about 1/4" deep with table salt.

	Resistance varies with humidity.

   Frank R. Borger - Physicist    __       Internet:  Frank@rover.uchicago.edu
Michael Reese - Univ. of Chicago |___      Phone : 312-791-8075 fax : 567-7455
  Center for Radiation Therapy   | |_) _   The race may not be to the swift nor
    2929 South Ellis Avenue        | \|_)  victory to the strong, but that's
    Chicago, Illinois 60616           |_)  how you bet. - Damon Runyon
Newsgroups: sci.electronics
From: wrb@cbnews.cb.att.com (wallace.r.blackburn)
Subject: Re: Sources for Motorola Chips !!
Organization: AT&T
Distribution: usa
Date: Fri, 4 Sep 1992 19:09:58 GMT

In article <1992Sep4.170404.4222@cis.ohio-state.edu> rubin@glockenspiel.cis.ohio-state.edu (Daniel Rubin) writes:
>Does anyone know of a good and economical suppliers of Motorola chips?  I am
>looking for linear and microprocessors for the most part!  I have the Digikey
>and Mouser catalogs and neither one sells Motorola?
>
Motorola sells through distributors and many don't like small quantities
(anything < 1 billion :).  My favorite is Future Electronics at
1-800-945-6996.  Tell 'em you heard about 'em on Netnews.  They don't
understand what it is, but they get a kick out of it.

I have no connection with Future Electronics except as a satisfied
customer.
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: wwv radios
Date: 28 Aug 92 14:37:21 GMT
Organization: University of Pennsylvania, Mechanical Engineering


alas, radio shack has discontinued their 'timecube' wwv recievers.

does anybody else carry these things? ( in the <$50 neighborhood.. )

can i replace the crystals in a 'weatheradio'?

while i'm here :-)  what's a simple/elegant/cheap way to automagically
synch a clock to the radio signal? ( one shot, i mean ) I suppose i need
to start with a narrow filter to listen for the tone. ( i just know
this has been a 'magazine' project someplace... )
From: biman@turtle.ee.QueensU.CA (Aapoolcoyuz)
Newsgroups: sci.electronics
Subject: Re: Filtering wind noise
Summary: Removing wind noise..
Date: 31 Aug 92 17:15:01 GMT
Organization: Dept. of Electrical Engineering, Queen's University, Kingston, Ontario, Canada



I once saw a throat mounted microphone.  Can`t remember
where, but it was mounted inside a "headband" like ring
and the ring fit around the users throat with a clip of
some kind.  I would think this would work for sky-divers.

A. Biman 

Newsgroups: sci.electronics
From: aroest@fwi.uva.nl (Axello de Roestello)
Subject: Re: Mac to Phone connections...
Organization: FWI, University of Amsterdam
Date: Thu, 27 Aug 1992 16:06:30 GMT

rubin@cis.ohio-state.edu (Daniel Rubin) writes:

>Hi all... I want to connect my Mac to my phone.  I am going to connect the
>speaker of the Mac to the mic of the phone and the speaker from the phone to
>the Mac's mic...

>I know that the levels do not match.  The speakers are very high and the mics

Don't do it!!!
Not only do the levels not match, the phone line can have 60 volts across its 
wires and will fry your Mac when it is ringing. You have to use a transformer
to isolate your Mac from the phone line. It's a nice project but you must
be more comfortable with electronics before you do it if you don't want to 
lose your Mac.

Axel
-- 
axel@phys.uva.nl     | In the beginning the Universe was created.
aroest@fwi.uva.nl    | This has made a lot of people very angry
                     | and been widely regarded as a bad move.
                     | (Douglas Adams)
From: re_sims@vax.muskingum.edu
Newsgroups: sci.electronics
Subject: Re: Phone in use light - help!?SKIP
Date: 27 Aug 92 13:40:39 -0600
Organization: Muskingum College

In article <BtHoqL.7F@news.larc.nasa.gov>, kludge@grissom.larc.nasa.gov ( Scott Dorsey) writes:
> In article <JON_SREE.92Aug23215911@world.std.com> jon_sree@world.std.com (Jon Sreekanth) writes:
>>In article <1992Aug22.194629.9065@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>>
>>   Build mine instead (forthcoming in Popular Electronics) -- its impedance
>>   across the line is 66 megohms, well above the 0.7 megohm minimum.
>>                                                 ^^^^
>>As far as I remember, FCC 68 limits on hook DC resistance to 5M minimum,
>>below 100V. Maybe the GTE test procedure was to send out a repair person
>>when they found less than .7M, that's all. 
> 
> I thought the official GTE test procedure was to send out a repair person
> only after the third call and the second letter from a lawyer threatening
> a suit for breach of service.
> --scott
>    (who, thank the lord, no longer has to deal with GTE service)

Scott,

   You are so lucky, not having to deal with Gte any longer.
  
   Here in Eastern Ohio, there is no problem getting a phone "
repairman" out, the problem is he has no idea what to do, notice
I put the word "repairman" in quotes.

   For instance, they had a problem with one of their lines running
across a vacant property, so they just put another on on the 
ground last fall, but my bushog hit it, Gee too bad.

Jim Sims Sr.   "tired of fighting GTE, just gave up"
re_sims@vax.muskingum.edu


Newsgroups: sci.electronics
From: jru@Comtech.com (Jimmy R. Upton)
Subject: Re: Magnetic Levitation - How do I do it?
Organization: Comtech Labs Inc, Palo Alto
Date: Wed, 2 Sep 1992 00:01:52 GMT

After this restatement of my orginal post is a summary of the
responses I received.

In article <1992Aug27.032614.29039@Comtech.com> jru@Comtech.com (Jimmy R. Upton) writes:
>Several years ago I but some energy into researching a particular
>"brand" of magnetic levitation and did not really get the answers 
>that I was looking for.  Maybe someone on the net can point me in
>the right direction.
>
>I would like to magnetically levitate an object by using only apparatus
>which is underneath the object to be levitated.  The object to be 
>levitated, therefore, must not require wires to be connected to it
>or a pole to run up though the center of it.  The demonstrations that 
>I have seen always have a pole or rod going up through the center in order
>to keep them from "falling off" the magnetic field.
>
>Any pointers on where to find information on this subject would be
>greatly appreciated.  
>
>I attempted to build such a device about 4 years ago using a large
>electro-magnet fed with ordinary (U.S.) household A.C. (60 hz, 120V).
>I tried levitating several types of materials - metal washers, disks,
>etc made of several different materials but nothing worked (i.e. no
>repulsive effect was observed).
>
>Specific Questions:
>
>1. What is the correct material to use for the levitated metal?
>2. What is the correct material to use, if any, for the electro-magnet
>core?
>3. What is the optimum frequency to use for alternating the magnetic
>field?
>4. Will this approach work at all (maybe this should be question 1 :-)?
>
>Reply to the net if you wish, however to save bandwith I will be happy
>compile Email responses and post a follow-up to the net.
>
>Thanks for your assistance.
>
>Jimmy
>jru@Comtech.com
>

The responses I received were split between people telling me it could
not be done and others telling me how to do it!  I LOVE the internet :-).

I received lots of suggestions but no pointers to specific literature that
deals with the problem I described.  If anyone has any such material, I 
would still like to know about it.

There were a few responses that described something quite similar to my
contraption but used three or four magnets focused toward a point at which
the metal object was levitated.  Having several magnets makes it possible
to create what is essentially a magnetic bubble or bowl which contains
the object.  

If someone is especially interested in this subject and want some more
detail on the responses I received or better yet would like to help 
figure some of this out - contact me by Email and we can go from there.

Thanks for all the help,
Jimmy
jru@comtech.com

Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Frequently Asked Questions (no answers)
Date: Mon, 24 Aug 92 03:39:18 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Summary: Some questions that keep coming up
Keywords: FAQ

Here's a list of questions that I see over and over again.  So
I'm starting a frequently asked questions list for sci.electronics.
I'll gladly turn this over to anyone who has a strong interest
in maintaining it, but I'm willing to get it started.

So here are a few questions.  I'll merge in answers sent to me, and repost.

BUILDING ELECTRONIC EQUIPMENT

1.   How do you make PC boards?  (Answers should be aimed at small volume
     low-cost applications).

2.   What public-domain software is available for laying out PC boards?

3.   Where do you buy electronic parts in small quantities?

4.   What magazines should one read to keep up in the field and where do you
     get them?

5.   Where can one get electronics kits?

6.   What public-domain tools are available for electronic design and
     simulation?

7.   How do you work with surface-mount devices?

SPECIFIC COMPONENTS AND SYSTEMS

1.   Where do you get info and parts for the Motorola 68HC11 series 
     microcontrollers?

2.   Where do you get info and parts for the Intel 8051 series 
     microcontrollers?

3.   Where do you get ultrasonic sonars?

4.   Where do you get BSR/X10 controllers and accessories?

THEORY

1.   How does spread spectrum radio work?

This is just a beginning.  Questions and answers are welcome, and I will
collate the results and generate a new FAQ message around 1 September.

Questions concerning ham radio, telecommunications, networks, encryption,
and legal issues should probably be dealt with in the newsgroups more
specifically aimed at those subjects, so if questions on those subjects
come up, they'll probably be handled by reference to another group.

					John Nagle


Newsgroups: sci.electronics
From: sdavis@laforge.ksc.nasa.gov (Steve Davis)
Subject: AC Power Monitoring Equipment
Organization: NASA
Date: Mon, 31 Aug 1992 19:19:16 GMT


  We are planning a power monitoring system for a new computer facility.  The  
facility will house a combination of mainframe and workstation-class machines,  
all operating from either single-phase 120V or three-phase 120Y/208V buses.   
The monitoring equipment must be configurable (exception levels, activation,  
etc.) remotely via RS-232/422 or ethernet.  The purpose of the monitoring  
system will be primarily to allocate "blame" for computer system anomalies to  
power line glitches, with secondary emphasis on diagnosing power system  
problems.

  So far, we have looked at the Dranetz 626R event monitor.  This is a 5-slot  
mainframe unit, with plug-in modules available for a variety of power  
monitoring needs.  The unit communicates with a local terminal or remote host  
via RS-232, and is controlled by issuing simple ASCII commands.  The 626R will  
probably meet or exceed our needs, but a fully-stuffed unit costs around $10K.

  Does anyone have experience with Dranetz equipment, or with similar equipment  
from other manufacturers?  Please respond by email if possible; I'll post a  
summary if there is significant interest.

Thanks in advance,

Steve
--
+----------------------------------------------------------------+
| Steve Davis                      | sdavis@laforge.ksc.nasa.gov |
| NASA, DL-DSD-32                  | (NeXT Mail preferred)       |
| Kennedy Space Center, FL  32899  |                             |
| (407)867-7582  fax:(407)867-2173 | #include <disclaimer.h>     |
+----------------------------------------------------------------+
Newsgroups: sci.electronics
From: hbg6@phx.mcd.mot.com (John Schuch)
Subject: Re: Vendors Request
Organization: Motorola Computer Group, Tempe, Az.
Date: Mon, 31 Aug 1992 15:37:15 GMT

In article <1992Aug28.153611.31702@ccad.uiowa.edu> petersen@ccad.uiowa.edu (Andrew D Petersen) writes:
> These chips were mentioned a while back on the net and I did not save
> the name of the posters.  I would like to try these chips out does anyone
> know where to purchase these chips in 1-10 quanties?
>
> Texas Instruments 74LS2000 Optical encoder and 16 bit counter in one.
> Hewlett Pakard HCTL-2000 Optical encoder and 12 bit counter in one.
> 	        HCTL-2016 Optical encoder and 16 bit counter in one.
>

I posted about the HCTL parts some time ago but they are NOT optical
encoders. They do accept the output of a quadrature encoder without
any other glue components.

You can call the HP Customer Information Center at 1-800-752-0900. You'll
have to duel one of those God-foresaken automated switchboards but
they'll give you a rep in your area. I also believe HP is willing to sell
most of their components direct ( tell them you need it to repair
something else ).

John

Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.aviation
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Subject: Re: Supplier Wanted for Aircraft Mike Plugs (3/16")
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Date: Fri, 28 Aug 92 22:58:30 GMT

This is called a "PJ-068" jack to us electronics folks. I
suspect you can get them from Newark Electronics, and many
other suppliers. A brandname is "Switchcraft" but there will
likely be many others.
--
A host is a host from coast to coast..wb8foz@skybridge.scl.cwru.edu
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: 5V voltage regulator
Date: 3 Sep 92 23:47:02 GMT
Organization: University of Georgia, Athens

The 7805, 78M05, or 78L05 depending on power requirements.

These should work with no resistors or capacitors; for extra
confidence you could put _one_ 0.1-uF capacitor across the output.

-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - we need not imitate mistakes of other states.
From: aaronf@cse.ucsc.edu (Aaron T. Ferrucci)
Newsgroups: sci.electronics
Subject: PGA package ZIF -> wire-wrap??
Summary: Do they exist?
Keywords: PGA ZIF wire-wrap
Date: 1 Sep 92 22:16:57 GMT
Distribution: usa
Organization: University of California, Santa Cruz (CE/CIS Boards)
NNTP-Posting-Host: arapaho.ucsc.edu

I am working on a project which uses some very expensive PGA package
parts. I would prefer to use ZIF sockets to save wear and tear on the
package pins. The initial prototype is going to be made using
wire-wrap, but so far, I haven't been able to find a company which sells
wire-wrap lead ZIF sockets. Does anyone know of such a company? 

On the other hand, I'd be interested in hearing peoples' creative 
solutions to this problem. I realize that most hobbyists probably don't
need to use PGA packages very often, but someone out there in the "real 
world" must have solved this problem. If there is interest, I'll post 
a summary of responses in about 2 weeks.

thanks,
Aaron Ferrucci (aaronf@cse.ucsc.edu)
From: forbesm@atlantis.CS.ORST.EDU (Mark Forbes)
Newsgroups: sci.electronics
Subject: Re: Humidity Sensor Needed (Cheap!!!)
Date: 27 Aug 92 04:50:10 GMT
Article-I.D.: leela.1992Aug27.045010.1018
Organization: Computer Science Outreach Services - Oregon State University

Rather than a lot of speculative thoughts on methods for sensing humidity, why
not look in..............


Sensors Magazine
Helmers Publishing, INc.
174 Concord St., PO Box 874
Peterborough, NH 03458-0874
(603) 924-9631
fax   924-7408

free to engineers and good liars.

Article: Aug 92, Normalized RH for High-Temperature Humidity Measurement
Show: Sensors Expo, O'Hare Expo Center, Chicago, Sept 29-Oct 1 1992
Ad: pg 57, Interchangeable RH Sensor (Phys-Chem Sci Corp, NYC, NY, P/N EMD-2000)
Ad: pg 63, RH Sensor, Panametrics Corp, Waltham MA


Just a silly idea................

Mark G. Forbes | forbesm@atlantis.cs.orst.edu
Corvallis, OR  | 503 757 8416 work phone    | Hardware R & D
From: gkwan@balboa.eng.uci.edu (Greg Kwan)
Subject: Re: 100 pin QFP ZIF
Newsgroups: sci.electronics
Organization: University of California, Irvine
Date: 4 Sep 92 00:45:24 GMT

In article <BtxExK.9oy@watserv1.uwaterloo.ca> dbowman@shade (Don A. Bowman) writes:
>I am looking for a zif socket for a 100 pin quad flat pack (normally surface
>mounted j-wing device). It has 25 pins on each side. (It is a Toshiba
>TMP68303).

Not ZIF, but how about LIF? There are LIF QFP sockets on some Motorola
evaluation modules/boards (e.g. the HC05EVM has a couple). I think the
sockets are made by AMP (can anyone confirm this?). These sockets allow
the devices to be easily removed by pressing down on the sides of the
socket.

greg

gkwan@balboa.eng.uci.edu
Xref: sparky sci.electronics:15224 alt.guitar:7763