HDTenEightyP/NetNews huggingface dataset:
From: ocrrolla@unix1.tcd.ie (P A O'Carroll)
Subject: Re: ZIPS/SIMMS ON A WIREWRAP BOARD??
Organization: Trinity College, Dublin
Date: Tue, 13 Oct 1992 11:36:37 GMT

In <1992Oct13.004355.4675@athena.mit.edu> larryhsu@mtl.mit.edu (Lawrence Hsu) writes:

>Has anyone ever tried to mount ZIPs/SIMMs with two staggered rows of
>0.1 mil pitch pins on a wirewrap board, which has 0.1 mil pitch holes
>but in a nonstaggered pattern?  

>I want to change this:
>     *   *   *   *   *   *   *
>       *   *   *   *   *   *   *
>to this:
>     *   *   *   *   *   *   *
>     *   *   *   *   *   *   *

>Are there any sockets that change the staggered pattern to a
>nonstaggered?  I looked through the AMP catalog, and they had nothing
>for 64-pin SIMMs.

>Thanks,

>Larry Hsu
>larryhsu@mtl.mit.edu

I had this problem too trying to fit 80 VRAMs onto a w/w board. The
simplest solution I found was to physically bend the pins on the chip.
This is not so drastic as it sounds. The trick is to plug the chip into
loose SIL sockets first and to tap (firmly) alternately both ends of the
chip until the pins have been shifted up/down by 0.025mil until they fit
side by side. This technique worked very well for me - I didn't break
any chips. It's a little time consuming but if you are going to wire
wrap this hardly seems relevant.

Philip O'Carroll
Computer Architecture Group
Trinity College Dublin.

pocrroll@cs.tcd.ie
From: abond@rvgs.vak12ed.edu (Andrew H. Bond)
Newsgroups: sci.electronics
Subject: SATURN serial port info wanted
Date: 9 Oct 92 04:15:10 GMT
Organization: Virginia's Public Education Network (Roanoke)


	I am a proud owner of a 1992 Saturn SC. as I am an avid
hacker. I would like any info that is available on
communicating with my fine automobile. The people at the
dealership were of little help other than offering to sell me
the $300 service manual for the car. This is not exactly what I
had in mind, as I am not sure if what I am looking for would
even be in that manual, ie. pin-outs, protocal, etc.. Any help
appreciated.
		--AHB.
-- 
andrew h bond, 	rvgs	!!   No Matter How Bad the Election Gets Remember:
dead fish: what you 	??	"Demoracy is the worst form of government,
find caught in the net	..	excepting all the others".-Winston Churchill
From: "glen mead" <glen.mead@canrem.com>
Subject: help - tech report
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 10 Oct 92 19:02:21 EST

Hi All,

With regards to my original questions regarding the control of a stepper
motor, I have recently discovered that this is not actually a stepper
motor but a 3-phase motor.  The actual part is a Tohoku Ricoh type
7M100200 with ratings of DC24V, 0.2A, 48W.  This 3-phase motor is part
of an optical housing assembly from a laser assembly which also includes
a laser drive assembly and scanning mechanicals.  What I need to know
is, how to operate and control this stepper motor, how to operate and
control the laser, and how to replace the laser diode with which
produces a visible beam.  For further project description and 3-phase
motor pin numbers and names, see below.

 Any help would be greatly appreciated.  Thanks for any help in advance.
 Comments and suggestions are welcome.

 Glen Mead

 ---

 Project Summary:

By utilizing the optical housing from a laser printer and replacing the
laser diode with one of a visible wavelength, a display type laser
device can be constructed providingproper control circuitry is utilized.
Scanning functions would be provided by mirrors mounted on a 3-phase
motor assembly and a series of focusing lenses and mirrors.  Graphics
would be generated by turning the laser on and off at specific places
(determined by the frequency and duty cycle of the control waveform)
during each scan. Timing of the 3-phase motor and laser would be based
on a sync pulse generated in the optical housing assembly at the end of
each scan line.


 3-Phase motor pins:

 1 - W-Phase
 2 - V-Phase
 3 - U-Phase
 4 - H-W2
 5 - H-W1
 6 - H-V2
 7 - H-V1
 8 - H-U2
 9 - H-U1
 10 - H-GND
 11 - H-VCC
 12 - FG1
 13 - FG2

 NOTE: The H-??? pins are power and output pins for Hall elements,
 something else I could use a hand with. :-)
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Power and signal over 50 ohm cable
Date: 15 Oct 92 22:58:46 GMT
Article-I.D.: u.1992Oct15.225846.24462
Organization: University of Washington, Seattle

In article <1992Oct15.032329.27616@am.dsir.govt.nz> srgxnbs@grv writes:

>basically I'd like to get a circuit which would allow me to power a remote
>transducer pre-amp (say 20-30VDC) and return the amplified signal (10kHz-
>1MHz) via a single 50 ohm coax cable.

	(I tried E-mail, but can't get through with the address given)

        It's really pretty simple; just power the preamp/oscillator with
a resistor/zener shunt regulator, and connect the AC signal
(through a transistor) to the coax.  The most convenient connection
is collector-to-center-wire, base to signal, emitter to resistor
to ground.

        Whatever the signal condition, the shunt regulator will
draw the current that the amplifier doesn't, so the current
in the central wire of the cable is fixed.  To this fixed
current you simply add some signal (modulated) current,
with that external transistor (or even just a small capacitor
to hold off the higher line voltage).

        Beware of oscillations in the coax cable, by the way;
you want to have resistor termination at both ends, or you
might end up with an accidental oscillator using the
cable as a delay line.

        John Whitmore
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics
Subject: Re: RFI/EMI shielding of a plastic box
Date: Thu, 15 Oct 92 01:02:25 CDT
Organization: The Inquiring Mind BBS  1 204 488-1607

kharstin@MtHolyoke.edu (Ken Harstine) writes:

> Richard Banks (ah335@cleveland.Freenet.Edu) wrote:
> > ++
> > 
> > a
> > I have a 0plastic housing to put my circuit into but I'm worried about
> > RFI int++erference.  I am going to try using aluminum foil, my question is
> > how ma+ny layers do I need.  I know just one will not work.  I remember
> > from 0chemistry I when rutherford discovered electrons they passed
> > rig++ht through one layer of aluminum foil, or was that gold foil?
> > At any rate could someone give me a good idea of how many layers to
> > us+e to line the box with.   Thanks.  Richard Banks
> 
> Aluminum foil will work fine.  However 3M has a line of aluminum and copper
> foil tapes with a conductive adhesive backing.  These can be applied to the
> surface of the box.  This can be much easier than dealing with loose pieces
> aluminum. 
> 
> As the other respondents noted, EM fields are effectively attenuated by
> very thin layers of conductive material.  This

a good ground plane on your PWB will be effective unless you have some 
high impedances on the circuit. Otherwise, be sure to seal the seams of 
your tape, foil or whatever you use. Slots make good antenna!  Mesh is an 
alternative with a meshed grommet for seams. There a catalogs full of 
this stuff from EMI mat'l Companies. It's not cheap though.....
Tony Stewart/Winterpeg,Canada


dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: gsulliva@enuxha.eas.asu.edu (Glenn A Sullivan)
Subject: Re: FM stereo in TIME domain. (Was Re: How does stereo FM radio work?)
Summary: Any advice on RF bleedthru cancellation of balanced mixer
Organization: Arizona State University
Distribution: na
Date: Fri, 9 Oct 1992 05:18:28 GMT

There have been several references to carrier suppression for FM multiplexing.

This is of interest to me. I am prototyping a design to convert a modulated
carrier to another frequency. Unfortunately there is some overlap of sidebands
between the  input and output signals; and the input carrier also falls
within the desired  sideband region of the output signal.

SO I am using a balanced mixer, the NE602, to pretty much cancel out what
RFin might bleed through into the output (IF). Tying a transformer across
the differential outputs of the NE602 easily results in 20dB additional
supression of RFin. I find that 100Kohm resistors or 33pF caps to ground
will degrade the supression by 5 or 10dB (I am exploring how crucial PCB
strays must match), and tweaking the input DC bias can help also.

Any advice from other users of diode or IC balanced mixers on achieving
RFbleedthru reduction?

Allen SUllivan
Designing a new product for GO-Video


Newsgroups: sci.electronics
From: whit@milton.u.washington.edu (John Whitmore)
Subject: Re: Power boost.
Organization: University of Washington, Seattle
Date: Wed, 14 Oct 1992 00:22:03 GMT

In article <XTogsB1w165w@inqmind.bison.mb.ca> norm@inqmind.bison.mb.ca (Norman P. Paterson) writes:
>I would like to take a regular 9volt battery and boost its power as much 
>as possible.  How can I do this? 

	If you want to do it for the full discharge lifetime of the
battery, there's only one suggestion: match your load impedance to
the output impedance of the battery.  This gives maximum output
power from the battery (or any other power source).  By 'match',
I mean apply a load impedance which is the complex conjugate
of the source impedance.  

	If you just want a very high power burst, you can use a capacitor.
If you want a high voltage high power burst, purchase an inexpensive
photographic strobe light: the innards of this gizmo boost the
battery voltage up to circa 300V, and can deliver the full stored 
power in a millisecond (you DON'T want this across your fingers,
by the way).  Typical stored energy in a small unit would be 10 J
(that's ten joules).  Peak power is circa 12 horsepower (but remember,
that's only for a SMALL fraction of a second).

	John Whitmore
From: dwoodwar@daisy.ee.und.ac.za (Duncan R Woodward)
Newsgroups: sci.electronics
Subject: Fluke 80 series Multimeters and data I/O
Date: 16 Oct 92 08:09:37 GMT
Organization: Dept. Elec. Eng., Univ. Natal, Durban, S. Africa
NNTP-Posting-Host: daisy.ee.und.ac.za

Hi netters,
I have a query relating to Fluke's series 80 multimeters. The manual for
these meters indicates that the meter can output the displayed
voltage/current/resistance etc. via an ultrasonic signal that is produced by
the built in continuity beep speaker. I think they also give the data rate as
well as the signal frequency. However what I would like to know is what the
format of the output data is and if anybody has successfully built an
interface to these meters using this data output facility. 

You might say why not just contact Fluke and ask them for the info. I
personally have not done this but I believe from other sources that Fluke are
not keen to divulge this information. This is probably because as the manual
mentions the output facility is used for testing purposes during manufacture
and I surmise that Fluke does not want any third parties setting up repair
and test facilties for these meters. 

I personally am interested in interfacing the meter to my PC for data logging
purposes etc.

I would be pleased to hear from anybody with experiences along this line.

Cheers Duncan

dwoodwar@daisy.ee.und.ac.za
dwoodw@elaine.ee.und.ac.za
Newsgroups: sci.electronics
Subject: Viewdata Terminals
From: Mike_Diack@kcbbs.gen.nz (Mike Diack)
Date: 12 Oct 92 01:26:20 GMT
Organization: Kappa Crucis Unix BBS, Auckland, New Zealand

Well viewdata seemed to be a massive flop, but not before Sony manufactured 
lots of those elegant little 9 inch trinitron monitor/modem units, which 
now appear regularly at junk sales for next to nothing. Has anyone ever 
worked out anything useful to do with them ? - they seem just too good 
to trash....ideas , folks ?
cheers, Mike.
From: irac@yang.earlham.edu
Newsgroups: sci.electronics
Subject: Help with my scope!
Date: 13 Oct 92 17:44:59 GMT
Organization: Earlham College, Richmond, Indiana

Hello, I need a little help with scope problems.
I have an older 50mhz Hewlet Packard Scope. It seems to be having some trouble
with the focus. The only time that this happens is when I have it set on XY and
watching the two channels of my stero. What seems to happen is when I have the
Horizontal Scale knob set to greater then .2 mv per cm it is focused fine.
However as soon as I click the knob one over to the left to increase the scale,
the focus goes away and I get a fuzzy double line for everything. I fooled
around with the astigmatizm and stuff like that but it didn't seem to affect
anything. I have a temp fix that seems to work by putting a small cap between
the Horizontal input and the ground.  I realize that I could be experiencing
several different problems but could anyone give me a hand?  Also the focus
seems to get worse to the right of the screen. This could be my own fault with
the astigmatism. 
	The whole deal is not too imporant as I only have the scope hooked up
so I can watch the songs I play on my stero, but it looks much better when it
is sharp and I sometimes use the scope on people's guitars and my own circuits.

Thanks very much for your time.

-ira

/{E-mail for questions about it all to IRAC@yang.earlham.edu}?
/{You mail me.. I ask you questions. Eat a lollipop Mary.   }?
From: jimkirk@news.uwyo.edu
Newsgroups: sci.electronics
Subject: RFD: rec.crafts.metalworking
Date: 14 Oct 92 16:19:04 MST
Distribution: world
Organization: University of Wyoming - Laramie, WY

X-NEWS: corral news.announce.newgroups: 641
Relay-Version: VMS News - V6.0-3 14/03/90 VAX/VMS V5.5; site news.uwyo.edu
From: jgd@dixie.com (John De Armond)
Newsgroups: sci.electronics
Subject: Re: halogen lamps and infra-red emission
Keywords: halogen infra-red
Date: 16 Oct 92 15:05:48 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

ginger@hydrus.trl.OZ.AU (Jeremy Ginger) writes:

>Hi everyone,

>I was "told" that halogen lamps emit infra-red rays.
>If so what sort of effect do they have on humans,
>animals etc.

In sufficient quantities, infra-red rays cause profuse sweating, 
redness of the skin, a general feeling of malaise.  At higher
doses, IR causes burning, blistering, loss of hair, and ultimately
death.

Of course, at low doses, it simply makes you feel good.  Infra-red
is simply a more descriptive term for "heat".  That is, when you
warm your buns next to a fire, you're soaking up infra-red rays.

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine (TM) |
Marietta, Ga                         |Interested in high tech and computers? 
jgd@dixie.com                        |Write me about PE Magazine
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: Spectrum anaylsers
Date: 08 Oct 92  14:54:28 CST

 > To learn more about mixers, check out any first year course in
 > communication
 > theory.

 > Chris

Y'hello,

I saw your message explaining spectrum analyzers. And a few times the term "Fourier Transform" has come up. What is said beast?

-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
Newsgroups: sci.electronics
Subject: Need help choosing an MCU
From: <DI3QC@CUNYVM.BITNET>
Date: Wednesday, 7 Oct 1992 23:08:31 EDT
Organization: City University of New York/ University Computer Center

     I have just started working with mcu's and I need help searching for one w
ith some of these characteristics. I would like an EEPROM area of 8K greater wo
uld be good, also 256-512 bytes of ram and about 32 I/O lines and a serial cpnn
ection to connect to an RS232 port. Any Ideas and help would be welcomed. Thanx


                                                  Alex Jeannopoulos
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: Re: serial to parallel converter ( as in rs232 -> centronics )
Date: 16 Oct 92 07:08:47 GMT
Organization: University of Pennsylvania, Mechanical Engineering


well, now i understand why they cost so much

:
:	Assuming you are going to do the right design

nope. 'no frills' no parity, no handshaking, one way communication.

I kind of suspect the off the shelf units i've seen don't do
parallel->serial conversion either.

:
:	B/ Nobody ever counts the cost of their own labor.

you are right there.  I wouldn't do it if it had no entertainment
value though.

:	As an aside, why didn't you spend a little more and get the right
:	kind of printer? ;-)

It was free, and i was told it had a serial port before i went to
pick it up.  Maybe i can find a cheap PC to drive it ( nah.. )


--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
Xref: sparky sci.electronics:17027 rec.radio.amateur.misc:16916
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Newsgroups: sci.electronics,rec.radio.amateur.misc
Subject: Re: Need: 12VDC 4A supply for 220V 50Hz
Date: 13 Oct 1992 02:58:41 GMT
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
NNTP-Posting-Host: skybridge.scl.cwru.edu

Many of the open-frame switcher supplies will run from 220 volts
too, and they don't care what the input freq is. One thing to
worry about is they have a MINIMUM load spec.

As for a brand, well, there's ACDC, Power One, Pomer Mate, and a
zillion others. Try your local surplus house, or the one listed
in the FAQ list here, too.

--
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@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: Sam's Photofacts
Date: 9 Oct 92 18:34:00 GMT
Article-I.D.: athena.1992Oct9.183400.413
Organization: AI Programs, University of Georgia, Athens


Thanks for setting us straight.  It *used* to be 1-800-USA-SAMS...

What we know for sure is that Radio Shack can order them.

Sams purchased by Prentice-Hall?  Hmmm...  Almost all the world's
publishers seem to have merged recently.
-- 
:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:- Artificial Intelligence Programs       phone 706 542-0359
:- The University of Georgia                fax 706 542-0349
:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI
From: an938@cleveland.Freenet.Edu (George II Lenzer)
Newsgroups: sci.electronics
Subject: Video LCD interface
Date: 10 Oct 1992 05:12:04 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc4.ins.cwru.edu


	I was looking through my Digi-Key catalogue and I saw a
special IC being offered.  It is called a Video LCD interface
and from it's description, it sounds quite interesting.  Does
anyone know how this chip works?  Does it require many external
components, or is it very self contained.  I, for one, would be
very excited at the prospect of building my own LCD video monitor.
Let me know if any of you have heard of this.

-- 
"I'll let you in on a little secret.
	The whole universe is totally INSANE!!!!"
						Mr. Natural
From: prob@btmp24.be (Pascal Roobrouck SH53)
Newsgroups: sci.electronics
Subject: Re : Mystery Part !
Date: 14 Oct 92 10:27:02 GMT
Reply-To: prob@btmp24.be (Pascal Roobrouck SH53)
Organization: Alcatel Bell Telephone, Antwerpen, Belgium


The component you are looking at is nothing mysterious at all. It is
just a Power MOSFET with following props. (For more detail, take the
databook !)

manufacturer : SGS Thomson
800 V,
2 A,
Rdsonmax 4 Ohm.
BUZ80A = TO 220 package, 100 W
BUZ80FI = Isowatt220 package 35 W
The device was probable manufactured week 23 of 1991
Pinout is the normal GDS.

Hope this will help you,
Pascal Roobrouck
Organization: University of Illinois at Chicago
Date: Wednesday, 7 Oct 1992 15:12:54 CDT
From: <U60460@uicvm.uic.edu>
Newsgroups: sci.electronics
Subject: Isolators

Can anyone help me in the design of Isolators using striplines and Ferrites

Thanks in advance

Siva
u60460@uicvm.cc.uic.edu
Newsgroups: sci.electronics
From: tadams@sbctri.sbc.com (Tom. Adams 529-7860)
Subject: Anyone heard of Albia Electronics?
Organization: Southwestern Bell Technology Resources, St.Louis, MO
Date: Fri, 16 Oct 92 22:10:39 GMT


I just got an Albia Electronics Frequency Counter but have no 
documentation for it.  I'd like to get a copy of it's schematic,
but have no idea if Albia is still in business, or where they 
are/were located.  The counter has two ranges, 30-550 Mhz, and 5-100MHz
at 50 and 1MOhm impedance respectively.  It also has a timebase switch,
for .1 and 1 sec and eight digit LED readout.

I'd appreciate hearing from anyone that has heard of these guys.

Thanks.
-- 
Tom Adams	tadams@sbctri.sbc.com adams@swbatl.sbc.com   314-529-7860
misology (mi-sohl'-ogee) Hatred of reason, argument, or enlightenment.
--  misologist n.	Not in any way connected to the word management.
From: urbina@novax.llnl.gov
Newsgroups: sci.electronics
Subject: Re: Who has surplus night-vision stuff?
Date: 7 Oct 92 07:19:55 GMT
Distribution: na

In article <56414@olivea.atc.olivetti.com>, gnome@flash.ATC.Olivetti.Com (Gary) writes:
> Does anyone know of a good source of surplus night-vision
> equipment?  I'm interested in both IR and Starlight units.
> However, I must admit that I'm looking for the lower-priced
> used stuff.
> 
> The economy being what it is... :-)
> 
> Thanks!
> 
> Gary
> 
> gnome@atc.olivetti.com


Try  Merideth Instruments 
     P.O. Box 1724 Glendale , AZ
     85301  (602) 934-9387


They normally sell used laser heads and such, but they also sell refurbished
Israeli military IR goggles.  We have a pair here at work and they're good.

I believe they sell them for around $450.00 a pair. Call for availability.

Guy
Urbina@novax.llnl.gov
From: gkwan@balboa.eng.uci.edu (Greg Kwan)
Newsgroups: sci.electronics
Subject: Re: MC68HC16EVB project question
Date: 9 Oct 92 02:36:59 GMT
Article-I.D.: news.2AD4F04B.7300
Organization: University of California, Irvine

In article <keating.717799639@galena13> keating@rtsg.mot.com (Edward Keating)
writes:

>Maybe we can get someone to post the code so we can verify that we
>all "got it right". Personally, I am against "rebates" that require
>you to perform some feat. This is not a "rebate" in that case, but
>a contest in which you win the "rebate" amount. 

Well, I just got my refund check so I guess I'd be willing to post
my 5band_sa.asm code (I didn't do all the programs) if there's still
interest and it doesn't offend anyone at Motorola's semiconductor
operations.

Moving on to other topics, has anyone played with the 3rd party
software included with the EVB? In particular, that real-time
kernel and filter design package look interesting. The kernel
seems mostly for demo use but is supposedly fully functional.
The filter design package looks quite useful. I visited Momentum
Data Systems (they're just up the street) and got more litera-
ture. From what I can tell, the FDASG they supply is quite capa-
ble and includes the HC16 code generator. I got the Burr-Brown
DAC (PCM56P) and hope to get some time to play with the EVB some
more.

To be honest, that 5 band analyzer project didn't do much for me;
it was like a jigsaw puzzle. But with the FDASG and the DAC, I
think there's a lot more to be done with the HC16 EVB. All-in-all
an excellent package.

greg

gkwan@balboa.eng.uci.edu
Newsgroups: sci.electronics
From: larryhsu@mtl.mit.edu (Lawrence Hsu)
Subject: ZIPS/SIMMS ON A WIREWRAP BOARD??
Organization: MIT Microsystems Technology Laboratories
Date: Tue, 13 Oct 1992 00:43:55 GMT

Has anyone ever tried to mount ZIPs/SIMMs with two staggered rows of
0.1 mil pitch pins on a wirewrap board, which has 0.1 mil pitch holes
but in a nonstaggered pattern?  

I want to change this:
     *   *   *   *   *   *   *
       *   *   *   *   *   *   *
to this:
     *   *   *   *   *   *   *
     *   *   *   *   *   *   *

Are there any sockets that change the staggered pattern to a
nonstaggered?  I looked through the AMP catalog, and they had nothing
for 64-pin SIMMs.

Thanks,

Larry Hsu
larryhsu@mtl.mit.edu
Newsgroups: sci.electronics