HDTenEightyP/NetNews huggingface dataset:
From: michaet@hubcap.clemson.edu (michael dale townsend)
Subject: Re: GM diagnostic harness
Organization: Clemson University
Date: Thu, 8 Oct 1992 17:47:45 GMT

mark@wdcwdc.sps.mot.com (Mark Shaw) writes:
>. . . . .  You can do the same thing with a piece of wire and
>the factory (Helm) shop manual.  On my GM cars I just short the
>two appropriate pins together and the "CHECK ENGINE" light flashes
>the error code number.  

>Mark

Do the shop manuals tell which pins are the "appropriate" pins?
Also, my 1977 Pontiac Grand Safari has a couple of suspicious looking
wire harnesses under the hood.  (One is near the air-conditioner btw.)
I didn't know that they had the diagnostic computers in cars back then.
Does anyone have any info or ways to get info on this?  I'd like to
capitalize on this if possible.
Michael Townsend		michaet@hubcap.clemson.edu
From: tomb@hplsla.hp.com (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: Need small tool to cut pcb board
Date: 6 Oct 92 23:55:57 GMT
Article-I.D.: hplsla.5170228
Organization: HP Lake Stevens, WA

dale@ldgo.columbia.edu (dale chayes) writes:

>	I recently had to make a "Frankenstien" (scab two pieces of
>prototype board together) without benefit of power tools. I scribed
>both sides of the board using a razor knife using a steel machinists
>scale (ruler) for a guide and then broke the board along the (deep)
>scribe lines. Flexing the board a few times helped it part cleanly.
>This technicque is definitely not recommened for production  use,
>but it worked in a pinch. 

Actually, we've just started getting in production panels that are
done just about that way:  the pc shop scores around the edges of
the board instead of routing, the previous standard way the boards
were cut out of the panels.  It's probably not a bad idea if you
want to use a table saw to do the job, since the thin, hard board
material can catch in the saw.  That's a lot less likely to 
happen if your blade comes up just under half the board thickness,
and you make a cut on each side, then break the board material at
the score.  It's probably worth experimenting doing the scoring
with the blade set vertical or at 45 degrees tilt, putting a
square-bottomed trough or a V-grove in, respectively.  Also, you 
can score your 3"x3" squares all over the blank (even after etching,
if you allow for the score width...), without having to handle any 
3" wide, let alone 3"x3" squares, on the saw.  You only break them 
apart after all the scoring is done.

I agree that shearing is probably the best for small quantities if
you don't have better equipment, but if you don't have access to a
shear, there _are_ other ways.
From: bender@oobleck (Duke of Canterbury)
Newsgroups: sci.electronics
Subject: Re: pins for null modem ??? help..
Date: 12 Oct 92 23:39:33 GMT
Reply-To: bender@oobleck.eng.sun.com
Distribution: ont
Organization: SPARK's R US
NNTP-Posting-Host: oobleck
X-Newsreader: Tin 1.1 PL3

darek@gpu.utcs.utoronto.ca (Darek Dabrowski) writes:
: I need the pins that are used for null modem cable. (serial port..)

This is what I use for a null-modem cable for a Sun workstation:

		pin	pin	function (DTE view)
		 1	 1	       shield
		 2	 3		TxD
		 3	 2		RxD
		 4	 5		RTS
		 5	 4		CTS
		 8	20		DCD
		20	 8		DTR
		 7	 7	   signal ground

I don't use pin 6, DSR, but if you need it, commonly it's connected to pin 8
on each end.

: 	there are 25 pins which should be connected and how ???
: 
: 	1 . . . . 5 . . . . 1 . . . . 5 . . . . 2 . . . . 5
: 
: 	1 . . . . 5 . . . . 1 . . . . 5 . . . . 2 . . . . 5

What is this interesting little diagram?

mike

--
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    Grashopper, you have been many years in the training, and I grow old,
    expecting the day when I receive the SIGXCPU, and _exit this world.
    I see that you are ready.
From: Jason.Goga@mailbox.bison.mb.ca (Jason Goga)
Newsgroups: sci.electronics
Subject: Electronics magazines & Mail order brides
Date: 08 Oct 92  14:55:41 CST

 > In article <kennehra.718236463@craft.camp.clarkson.edu>
 > kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes:
 >>
 >>
 >>Hi.  I was flipping through the back sections of one of my electronics
 >>magazines when I saw these ads advertising "attractive asian ladies
 >>who seek friendship, marriage..."  Could someone PLEASE tell me why
 >>a company like that would advertise in an Electronics magazine?!?!
 >>Has anyone ever answered these ads?!?!  This is something "consumer
 >>reports" should definitely check out!!!
 >>
 >>- Rich
 >>  kennehra@logic.camp.clarkson.edu
 >>
 >>
 > They wouldn't advertise if they didn't get business.  Maybe
 > the sterotype of the nerdy electronics guy has a ring of
 > truth to it...
Hmm, wonder what issue that was in. :-)

-Jason

---
 * Origin: C.A. - FrontDoor (1:348/207)
From: X1FT@VM1.CC.UAKRON.EDU
Newsgroups: sci.electronics
Subject: Re: Help with tube amp requested.
Date: 7 Oct 92 21:31:11 GMT
Organization: The University of Akron

I chased down a similar sounding problem (no pun intended) some years ago,
and after *lots* of false starts, I found a grid coupling capacitor was
"breaking down" internally, causing the "crackeling" sound.  The function
of this capacitor is to block the dc plate voltage while passing the ac
(audio) component.  You will probably find this type of circuit between
each stage.  It should be fairly easy to trace with a audio signal
amplifier, with no input to the amp.  Poor attempt at simplified schematic
follows:
                              blocking/coupling
                                capacitor
          ________________________| |______             |------------>
  plate  |                     |  | |     |             |  plate
      -------                  |          |          -------
>------ - - -                  \          |---------- - - -     grid
grid   _____          plate    /                     _______
      | /\  |       resistor   \                    |  /\   |  cathode
      | ||                     /                    |  ||
      | ||____                 \                    |  ||
      | ------  filament       |                    |  || filament
cathode                        |----- to B+            ||
 
Hope this helps!
                                     - Frank
*************************************************************************
Frank Tompkins           :   Internet: X1FT@VM1.CC.UAKRON.EDU
University of Akron      :
Akron, Ohio   44325-3501 :
  "I have not failed, I've just found 10,000 ways that won't work"
                                                     - Thomas Edison
Newsgroups: sci.electronics
From: hbg6@phx.mcd.mot.com (John Schuch)
Subject: what's a SAW?
Organization: Motorola Computer Group, Tempe, Az.
Distribution: usa
Date: Fri, 9 Oct 1992 13:09:46 GMT

Could someone explain what a SAW filter is and what it is used
for? ( the $.25 explanation will do )

TNX
John

Newsgroups: sci.electronics
From: chris@lightnin.Columbia.NCR.COM ()
Subject: volts to digital display (?)
Originator: chris@lightnin
Organization: NCR Corp, E&M-Columbia, Columbia, SC
Date: Wed, 07 Oct 92 13:34:56 GMT

  I am interested in finding a chip that will convert an analog
voltage to a digital readout.  I will be monitoring less than 10v
so the display need only be "X.XX" type resolution.                   

  I'd appreciate any info!                                

   Thanks!


-------------------------------------------------------------------------
 Chris Landi                               
 Surface Mount Operations Center                 NCR MCPD -- Columbia
 phone: (803) 739-7364                           Operations & Distribution
   fax: (803) 739-7362                           3325 Platt Springs Road
 email: chris.landi@ColumbiaSC.NCR.COM           West Columbia, SC 29170

Thoughts expressed here are my own and not representative of NCR
-------------------------------------------------------------------------
Newsgroups: sci.electronics
From: iqbal@kaw.eel.ufl.edu (M.Iqbal)
Subject: PC Board Ground Plane 
Organization: University of Florida
Date: Fri, 16 Oct 92 20:16:32 GMT

Can anybody enlighten me why one needs ground plane in printed circuit
board for high frequency transmitter/receiver -- 50MHz. Moreover, is it
a good idea to make VCC line thicker than other? If so why? It looks like
that I missed these concepts in my fields class.

-- 

------------------------------------------------------------------
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---

Newsgroups: sci.electronics
From: govindg@ucunix.san.uc.edu (Girish Govind)
Subject: Followup question for "How to repair a Wyse 99GT terminal"
Organization: University of Cincinnati
Date: Fri, 9 Oct 1992 06:04:13 GMT

Hello again!
I had posted a question here regarding a problem with my Wyse 99GT terminal.
Basically, the terminal has lost the horizontal drive, when you turn it on
there is just a vertical line going thru the middle of the screen. The lineis
darker where there would have been text etc.

Well, several of you responded that it is either a loose solder or a blown
capacitor. How can one spot a blown capacitor? I opened it up and there does
not seem to be any visual indication that any of the caps have gone. How can
one isolate the problem device?

Again, please send replies to govindg@ucunix.san.uc.edu

-- Girish Govind
From: boakley@fox.nstn.ns.ca (Bruce Oakley)
Newsgroups: sci.electronics
Subject: QUERY: Any users of Rohm BU5963AS on-screen display IC??
Summary: Need help with subcarrier PLL
Date: 15 Oct 92 19:34:38 GMT
Organization: NSTN Network Operations Centre, Nova Scotia, Canada

I have an application using the Rohm BU5963AS on-screen display IC.
This chip requires a 14.31818 MHz crystal (4 times colourburst) which,
among other things, is used to phase lock to the incoming video
subcarrier.  Unfortunately, Rohm specifies a crystal which is only
available in Japan.  There are several crystals of this frequency
available in North America, but none of these provide adequate
phase locking performance.  I have no idea how the Japanese crystal
is different.  Has anyone had any experience/success with this chip?
Please help!

Thanks...

Bruce Oakley
Applied Microelectronics Institute, Halifax, NS, Canada
oakley@tinker.appliedmicro.ns.ca
From: stanb@hpnmdla.sr.hp.com (Stan Bischof)
Date: Thu, 8 Oct 1992 21:05:22 GMT
Subject: Re: 25 ohm coax cable
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics

In sci.electronics, vreeburg@fys.ruu.nl (Jurriaan Vreeburg) writes:

>I think that putting two cables in parallel doesn't change the impedance, since
>the impedance is defined as:

>                   L
>Z = square_root ( --- )
>                   C
>L: inductance per unit length
>C: capacitance per unit length

Yep.

>What happens if we put two cables in parallel: both the inductance and the capacitance
>increase by a factor of two -> Z doesn't change!!! 

Nope. Capacitance is doubled, inductance halved, Z halved.
      Don't forget that Z=1/jwC for cap but jwL for ind.

Don't believe me? Try connecting a 50 ohm cable to two 50 ohm cables
      in parallel. Launch pulse and see if you have a reflection at the 
      junction. Easy to do with any oscilloscope and a pulse generator.

Stan Bischof
HPSR
Newsgroups: sci.electronics
From: iqbal@kaw.eel.ufl.edu (M.Iqbal)
Subject: Re: volts to digital display (?)
Organization: University of Florida
Date: Tue, 13 Oct 92 22:01:07 GMT

In article <1992Oct12.005558.27976@megadata.mega.oz.au>, swanee@megadata.mega.oz.au (Geoff Swan) writes:
|> In article <1992Oct07.133456.16269@ncrcae.ColumbiaSC.NCR.COM>, chris@lightnin.Columbia.NCR.COM () writes:
|> >   I am interested in finding a chip that will convert an analog
|> > voltage to a digital readout.  I will be monitoring less than 10v
|> > so the display need only be "X.XX" type resolution.                   
|> > 
|> >  Chris Landi                               
|> 
|> All you need here is a linear VCO (try LM566 or similar) feeding a
|> counter gated with a slow clock signal. The output of the counter
|> feeds a binary to BCD decoder/driver for 7 segment or LC displays.
|> 
|>     Sla/n go fo/ill,
|>                     Risky B.
|> --------------------------------------------------------------------------
|> Geoff Swan (research & development)   _--_|\         swanee@megadata.oz.au
|> Megadata Pty Ltd                     /      \ 
|> 2/37 Waterloo Rd, North Ryde,        \_.--._/               +61 2 805 0899
|> NSW 2113, Australia.                       v          (Fax) +61 2 887 4847
|> 

What is he trying to say......?
-- 

------------------------------------------------------------------
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---

Newsgroups: sci.electronics
From: swanee@megadata.mega.oz.au (Geoff Swan)
Subject: Re: volts to digital display (?)
Organization: Megadata P/L, North Ryde, Sydney, Aust.
Date: Thu, 15 Oct 1992 04:25:40 GMT

Chris Landi said this bit ...
> |> >   I am interested in finding a chip that will convert an analog
> |> > voltage to a digital readout.  I will be monitoring less than 10v
> |> > so the display need only be "X.XX" type resolution.                   
> |> > 
> |> >  Chris Landi                               

I said this bit ...
> |> 
> |> All you need here is a linear VCO (try LM566 or similar) feeding a
> |> counter gated with a slow clock signal. The output of the counter
> |> feeds a binary to BCD decoder/driver for 7 segment or LC displays.
> |> 

M. Iqbal said this bit ...
> 
> What is he trying to say......?
>       						 >><<<     >>><<<<
> Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
> University of Florida				 [ | ]        | 
>                                   		   -         ---

And I replied with this ...
I'll spell it out slowly for you then...
The input analogue voltage is converted to a digital signal (pulses) by
a process known as voltage-frequency conversion by a VCO. The output 
frequency of the VCO is linearly proportional to the input voltage.
Take this pulse stream and gate it with a known, low frequency clock
into a counter (driving the displays). The higher input voltage, the higher
the count. With the correctly chosen gate and VCO range, you can have
10.0V input showing 100 counts, with a decimal point activated in the
middle digit, this shows as 10.0! Cute, eh?

    Sla/n go fo/ill,
                    Risky B.
--------------------------------------------------------------------------
Geoff Swan (research & development)   _--_|\         swanee@megadata.oz.au
Megadata Pty Ltd                     /      \ 
2/37 Waterloo Rd, North Ryde,        \_.--._/               +61 2 805 0899
NSW 2113, Australia.                       v          (Fax) +61 2 887 4847

Newsgroups: sci.electronics
From: josh@Happy-Man.com (Joshua_Putnam)
Subject: Re: halogen lamps and infra-red emission
Keywords: halogen infra-red
Reply-To: Joshua_Putnam@happy-man.com
Organization: Happy Man Corp., Vashon Island, WA 98070-7399
Distribution: sci
Date: Fri, 16 Oct 1992 23:38:40 GMT

In <1992Oct16.205154.19630@athena.cs.uga.edu> mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:

>Because they are hotter than ordinary incandescents and because they
>have a quartz rather than glass envelope, halogen bulbs presumably
>emit more UV than ordinary bulbs.  But the proportion of UV would
>still be lower than in sunlight.  It probably makes the light
>_healthier_ rather than making it dangerous (UV is required for
>vitamin D synthesis).

It depends on the lamp and how it is used.  I have seen
reports of sunburn from using older halogen reading lamps
without glass lenses.  Unlike the sun, halogen lamps' light
doesn't have to pass through the ozone layer before it hits
your skin.  Fortunately, ordinary glass does a good job of
blocking the UV, and also helps protect you from chunks of
hot quartz if you ignore the instructions and get
fingerprints on the bulb, causing it to shatter.
-- 
 Joshua_Putnam@happy-man.com    Happy Man Corp.  206/463-9399 x102
 4410 SW Pt. Robinson Rd., Vashon Island, WA  98070-7399  fax x108
 We publish SOLID VALUE for the intelligent investor.  NextMail OK
Info free; sample $20: Send POSTAL addr: Solid-Value@happy-man.com
Newsgroups: sci.electronics
From: kharstin@MtHolyoke.edu (Ken Harstine)
Subject: Re: >FCC regulations and telephones
Organization: Mount Holyoke College
X-Newsreader: Tin 1.1 PL5
Date: Wed, 7 Oct 1992 23:26:49 GMT
From: drf40@cd.amdahl.com (Daryl Fortney)
Newsgroups: sci.electronics
Subject: Pitch Shifting
Date: 12 Oct 92 20:06:50 GMT
Reply-To: drf40@cd.amdahl.com
Organization: Amdahl Corporation, Sunnyvale, CA


	Does anyone know how a pitch shifter works?  Like effect processors for
instruments or voice can shift the pitch of the input signal up or down
by so many intervals and then harmonize.  Do they do this transposing in
the time domain, or do they do an FFT and then shift the frequency bands
then reverse it, or what?  Seems like a tough problem, which I have
always wondered about.

	I would like to build a device for myself to be able to lower or raise
my voice, clearly so I could sound like mickey mouse or the godfather.

	-df
-- 
Daryl Fortney						drf40@cd.amdahl.com
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: Motorola Literature Phone #?
Organization: SSC, Inc.,  Seattle, WA
Distribution: usa
Date: Fri, 09 Oct 1992 19:54:52 GMT
X-Newsreader: Tin 1.1 PL3

mark@wdcwdc.sps.mot.com (Mark Shaw) writes:
: In article <1992Oct8.122352.28979@cbnews.cb.att.com>, wrb@cbnews.cb.att.com (wallace.r.blackburn) writes:
: |> Anyody know the number for Motorola's literature distribution?  I've lost
: |> it and need to give them a call.  Thanks.
: 
: Try (602) 994-6561
: 
: Motorola Literature Distribution
: P.O. Box 20912
: Phoenix, AZ 85036
 
But if you want to do it on the Big M's nickel, it's
 (800) 441-2447

Mark Zenier  markz@ssc.wa.com
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: serial to parallel converter ( as in rs232 -> centronics )
Date: 15 Oct 92 16:48:48 GMT
Organization: University of Pennsylvania, Mechanical Engineering


'feels like' a pretty trivial thing to make, with the box and
connection ports being the most costly components.
So why do comercial converters cost ~$100. ( much more than i just
paid for this printer.. :)

i guess i am asking for:
a)reference to a schematic
b)explination of why i would be wasting my time to try to design one
  from scratch.
c)new or used converter for $20 :-)


--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
Newsgroups: sci.electronics
From: brantley@infonode.ingr.com (Dwight D. Brantley)
Subject: high voltage insulation breakdown
Organization: Intergraph Corporation, Huntsville, AL.
Distribution: usa
Date: Fri, 9 Oct 1992 15:35:51 GMT

I am experiencing a breakdown of the insulating properties of a high
voltage wire which seems to be related to several possible causes.  I
am having difficulties determining the exact cause of the breakdown.
The following is a description of the materials, the application and
the failure mode:

This is a high voltage anode wire which connects the high voltage power 
supply (29KV) to a CRT in a color monitor.  The wire is constructed from
a single strand copper wire (.01" diam.) and wrapped with a braided copper
which has been tinned (solder dipped) resulting in a .031" diameter
conductor.  This is surrounded by a PVC insulation which has markings
such as "XLPVC   TV-40   VW-1 OR CSA   40KV DC STYLE 3239".  The high
voltage power supply is self contained in a metal box and the anode wire
exits the box through a rubber grommet.  The wire makes an "S" bend
inside the box and exits the box at a slight angle which causes some
compression of the insulation by the grommet.  I forgot to mention that
the wire insulation is .185" diameter with a wall thickness of .154".
The anode wire insulation is breaking down either under the grommet or
right at the edge of it resulting in high voltage arcing to the metal
box.  The arcing leaves a hole in the insulation and can occur either
inside the box or outside but is always associated with the grommet.

Has anyone had any experience with this kind of problem?  Our theories
so far include the possibility of a plasticizer in the grommet causing
a breakdown of the insulation but we have other designs which use the 
same materials but are oriented differently and these do not experience
the problem.  This leads us to believe that a combination of bends in
the wire, compression by the grommet and residual plasticizers within
the grommet could all contribute to the failures we are experiencing.
I am looking for a source of information or first hand knowledge from
anyone who is familiar with high voltage phenomenon.  Any info or 
direction to a source of information would be greatly appreciated.

      ******************************************************************
      *   Dwight Brantley    *   Failure Analysis & Reliability Dept.  *
      *  Intergraph, Corp.   *  Reply To: brantley@falab1.b21.ingr.com *
      *   Huntsville, AL     *           Voice: 205-730-4456           *
      ******************************************************************
From: pxm22@po.CWRU.Edu (Prakash Mandgi)
Newsgroups: sci.electronics
Subject: C Cross Compiler For 68HC11 - Motorolla
Date: 12 Oct 1992 05:53:45 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: thor.ins.cwru.edu


HI ,
I am looking for a C - Cross Compiler for Motorolla 68HC11 series which
is capable of converting the C code into 68HC11 assembly language code
on the MS-DOS environment. 
	All responses should be sent to 
	mandgi@morph.ebme.cwru.edu
	prakash@ep.ebme.cwru.edu
Will be posting a summary of the responses on the net. Any names of commercial
products will be highly appreciated.
Newsgroups: sci.electronics
From: hunter@oakhill.sps.mot.com (Hunter Scales)
Subject: Theremins
Organization: Motorola Inc., Austin, Texas
Date: Thu, 8 Oct 1992 20:22:22 GMT


	I just got back from Orlando, visiting Disney World.  At the
	"Monster Sound Show" in the Disney-MGM Studios Theme park,
	there was a theremin in the lobby!  They played the opening
	sequence to "Forbidden Planet" on an old round TV tube, while
	you play the theremin.  You can vary the volume with the left
	hand and the pitch with the right.  I thought that you could
	vary more than just the volume and pitch on a theremin.  Maybe
	the "beat" frequency, too?  I would like to know more about
	these things and, possibly, build one.  Does anyone have any
	pointers to magazine articles/schematics?  Anyway, thanks in
	advance for an info.
-- 
Motorola Semiconductor Inc.             Hunter Scales
Austin, Texas                           hunter@prometheus.sps.mot.com
#include <disclaimer.h>
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Grounded soldering iron tip
Date: Fri, 9 Oct 1992 17:18:51 GMT
Organization: U of Toronto Zoology

In article <55550032@hpscit.sc.hp.com> rkarlqu@hpscit.sc.hp.com (Rick Karlquist) writes:
>I have found that using unground-tip soldering pencils on CMOS
>IC's will blow up the IC *every* time.

I've used my non-grounded-tip iron on 4000-series CMOS without problems.
*However*, this is a Weller transformer-base iron, so the tip may not be
grounded but it probably is fairly effectively isolated.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics