HDTenEightyP/NetNews huggingface dataset:
From: billq@ms.uky.edu (Billy Quinn)
Subject: Re: Idea for LED sequencer
    <2789@tau-ceti.isc-br.com> <BILLW.92Nov4223143@regal.cisco.com>
Date: Thu, 5 Nov 1992 17:05:48 GMT
Organization: University Of Kentucky, Dept. of Math Sciences

billw@regal.cisco.com (William ) writes:

>Just for kicks, here are some PAL equations to implement a very flexible
>chaser light thing using a 16r8 PAL (be sure and use the really fast 7.5nS
>version of the PAL for fastest blinking :-)  (Note, nearly all the other
>solutions describe are probably cheaper, easier to get parts for, and easier
>to implement.  This one does do more different patterns though...)

[stuff deleted]

Well while we are on the topic of versatility of patterns etc. -vs- expensive
designs ... I can't help but bring up the 68705K1.  Sorry if this opens a
can of worms, but it has the 10 I/O lines (16 pin chip) which WILL drive LEDs,
It will run off of an external RC network (no clock) and it's OTPROM version 
costs $3.50 (yes I finally got some in the mail!).  Of course this assumes you 
have the KICS kit.  

Sorry if I am getting off track.  This really is how I would do it though.


-- 
*-----------------------------------------------------------------------*
*	Bill Quinn			billq@ms.uky.edu		*
*-----------------------------------------------------------------------*
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: the KGB vs. LED sequencers
Date: 9 Nov 92 20:47:35 GMT
Article-I.D.: u.1992Nov9.204735.6406
Organization: University of Washington, Seattle

In article <96358@netnews.upenn.edu> george@mech.seas.upenn.edu writes:

>:What about the 4017? This is a Johnson type decade counter 
>:problems-
>:1. The pinout was tampered with by the KGB to make it totally 
>:   impossible to design a PCB for it.

>as a newcomer, i find this with many ic's.  Is there really some
>sense to the pinouts ( in general ) or are the pinouts driven
>enitirely by internal chip circuit design considerations?

	Back in the bad old days of SSI, chips were laid out
with very few components, and making a 'crossover' was
rather difficult.  You could cross a wire with a resistor,
or over a transistor in one orientation, but not over another
wire (nor could you cross two resistors).

	Chip layout did (then) determine the ways the pinout
could be oriented.  Some early designs had schematics in
the technical literature that showed how to lay out the
circuit in one plane, with no crossovers.  Other designs
had resistors that weren't doing anything (low-resistance
resistors in a path that only takes very low currents), which
were inserted to allow a wire to cross.

	Modern chips have more complex circuitry on them, and
there are a lot more tricks to get crossovers (and more
sites where crossing is possible); there are (for instance)
multilayer metallizations in some processes (important
for making MOS capacitors).  Nowadays, any new design
will be given a 'reasonable' pinout unless there is a compatibility
reason not to do so (example: EPROM pinouts are always
back-compatible to the venerable 1702, with the 'new'
address lines added wherever there was a spare spot for them).

	Of course,  'reasonable' pinout might be dictated
by high-frequency long wire effects.  The day is coming when
there will be very few chips where pin#1 is across from +V
and at the opposite row end from GND. 

	John Whitmore
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Stereo schematic
Organization: Motorola Computer Group, Tempe, Az.
Date: Wed, 4 Nov 1992 15:13:07 GMT

In article <1992Nov2.234622.5585@athena.cs.uga.edu> mcovingt@aisun3.ai.uga.edu (Michael Covington) writes:
>In article <1992Nov2.003710.1223@doug.cae.wisc.edu> greger@cae.wisc.edu (Greger Mike) writes:
>>	I'm trying to find the phone number of a company called Sam's 
>>photo-FAX.  They supply schematics for all types of electronic stuff.
>
>Order through any Radio Shack, or call 1-800-GAT-SAMS.
>

How much does a single PhotoFact folder cost? I usually buy the OEM
service manual but these days they're going for about $30.00. If
the Sams material is less expensive, I'd rather go thet way.

John
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: telephone humm any solution...
Date: 13 Nov 1992 00:16:02 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In sci.electronics, heyes@dadev.cebaf.gov (Graham Heyes) writes:
>The strange thing is that some days there is no humm at all,
>other days you can't hear yourself speak.

Ahh, the wonderful folks from C&P telephone and their quality demarc boxes.
What's happened is that there is current leakage between the ground and your
phone line someplace.  Could be that the demarc box is getting wet.  Could
be that the lines in the house are getting wet someplace.  Disconnect the
line at the demarc next time it gets bad and plug a phone into the box...
if you can still hear a hum, call C&P and place a report with the craftsmen
and make sure someone is there to explain that it's a ground imbalance
problem when the guy arrives.

If it's inside the house... well, you're going to have to start pulling
things apart to locate the problem.  Could be anything from a bad phone
to wet wiring.
--scott

   (who just got touch tone-service in his area last year!  Oh, wow!
    Maybe ISDN will be next.)
From: v064mcqs@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Anyone have Protel for Windows PCB Cad?
Date: 11 Nov 92 07:42:00 GMT
Article-I.D.: acsu.BxJK26.K2r
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 I am an electrical engineering student here at the University at Buffalo.
I do some small cad work and design circuits. I was very impressed with
the Protel Easytrax, the free shareware from Protel. Their new version
for Windows looks amazing. I am starting to get into double layer and complex
board design and am looking for someone who happens to have a copy. $4000
is a little steep for my budget. I would appreciate any help.

	Neil Gandler
Newsgroups: sci.electronics,misc.consumers
From: sbrenner@cbnewsb.cb.att.com (scott.d.brenner)
Subject: How Can I Eliminate Interference From Flourescent Light?
Followup-To: poster
Organization: AT&T
Distribution: usa
Date: Thu, 5 Nov 1992 13:26:41 GMT

I recently moved into a new cubicle at work.  Because of the limited
space, my Sun workstation is very close to a 4' flourescent light
tube (it's about a foot away).  I've noticed that the screen flickers
when the light is on.  I remember hearing that flourescent lights
actually go on and off about 120 times per second, but because of the
limitations of the human eye, we don't notice and it's not a problem.
I suspect that either the current going on and off in the light tube or 
the ballast is causing the screen flicker.

Short of just turning off the light (which would make this cubicle
_very_ dark!), is there anything I can do to reduce or eliminate the
flicker?  It's very annoying!

All suggestions would be appreciated.  I'd prefer a direct e-mail
response since I'm quite behind in my news reading!

a T d H v A a N n K c S e

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Scott D. Brenner
AT&T Consumer Communications Services
Basking Ridge, NJ
sbrenner@attmail.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Newsgroups: sci.electronics
From: grier@bnr.ca (Brian Grier)
Subject: Re: Radio Transmitter
Organization: Bell Northern Research
Date: Fri, 06 Nov 1992 13:49:53 GMT

One more thing. Call Julian, KR5J, Topolski. He works at Mitre
up in Bedford Ma.

Tell him I sent you.

Brian, WS1S
Bell Northern Research
Research Triangle Park, NC
Newsgroups: sci.electronics
From: gruber@danbob.vnet.ibm.com (Scott Gruber)
Subject: MARK LANGSTON
Date: Wed, 11 Nov 92 17:39:25 GMT
Reply-To: gruber@danbob.vnet.ibm.com (Scott Gruber)
Organization: IBM T. J. Watson Research Center

Mark,
      Below is a pinout of the Princeton Ultra 14 High Resolution Monitor.
Not sure if this is the one you were looking for.
It is a .28 dot pitch monitor.

Scott

---------

sync signals   ttl pos. or neg., composite or seperate, sync on green

Pinout
------
1
  14
2
  15
3
  16
4
  17
5
  18
6
  19
7
  20
8
  21
9
  22
10
  23
11
  24
12
  25
13

1  Ground(ttl)
   Red(analog)
2  Red 2 or Ground (ttl)
   Green (analog)
3  Red(ttl)
   Blue (analog)
4  Green(ttl)
   Composite or Horizontal Sync(analog)
5  Blue(ttl)
   PGC Mode(analog)
6  Green 2 or Intensity(ttl)
   Ground(analog)
7  Blue 2(ttl)
   Ground(analog)
8  Horizontal Sync(ttl)
   Ground(analog)
9  Vertical Sync
------------------------above for 9 pin connector to computer
10 n/c
11 Red Analog
12 Green Analog
13 Blue Analog
14 n/c
15 n/c
------------------------above for 15 pin
16 - 18 Ground
19 n/c
20,21 Ground
22 n/c
23 Horizontal Sync
24 Vertical Sync
25 n/c
From: tmkk@uiuc.edu (Khan)
Newsgroups: sci.electronics
Subject: Re: Magnetic Swipe Reader Decoders
Date: 10 Nov 92 18:17:45 GMT
Article-I.D.: news.BxIItM.A2E
Organization: University of Illinois at Urbana


In article <kwRVTB1w165w@halcyon.com> daniel r. mauch <daniel@halcyon.com> writes:
>                               Magnetic Card Swipe Reader
>
>     Some time ago there were several posts about Magnetic Card
>Readers and how to read the data. One of the files even had a C
>program called Swipe.C that would read  the data when a card was
>pushed thought the reader and could be displayed on screen or
>saved to a file.
>
>     A few weeks ago, I bought a SR&D mag card swipe reader in
>San Diego for $2.50. Using the information in the files posts
>dating back to Jan 92 , I was able to connect my swipe reader to
>my PC and using the program could read and store the contents of
>the card. The problem was that the data was a columnar listing of
>255's and 191's. I have deduced that the 255 is FF hex or 1111
>1111. The 191 is BF hex or 1011 1111. Since I am not a
>experienced programmer, I need some help in determining how to
>read the data.

What you're seeing is a raw dump of the data from the card reader.
Only one or two bit positions in each byte are significant (bit 6 for
sure, and probably one other - one for clock and one for data and
perhaps a third for card detected). You need to do a bit of work to
"digest" this raw data stream into meaningful data.

You say that you are not an experienced programmer; this is by no means
a "beginner" level task, so you may want to get someone with more
experience to sit down with you and play around. This will be really
tough to do over the net. ;-)
Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: EM radiation from power lines
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Thu, 12 Nov 1992 16:24:25 GMT

      There have been articles on this in IEEE Spectrum and EPRI Journal.
Information remains inconclusive, but EPRI admits there may be a problem.
They now have a "dosimeter" for EM fields, and various power workers
around the country are wearing them to gather data.  They also tried
some telephone workers, and discovered that central-office telephone
workers have low exposure except for some working in older electromechanical
offices.  

      So far no study based on field measurements indicates increased
risk with higher fields, at least for field ranges seen in residential
areas.  There is apparently some increased risk to workers in very high
field environments such as electric furnaces used to melt metals.
The residential studies that show a correlation are based on visual
observations of distance to power lines and location of pole transformers.
But the geometries that should produce the strongest fields aren't those
associated with the highest levels of cancer.  And the cancer levels seen are
very near the normal level of occurence.

      There are reports of some cellular effects that take place in modest
electric fields.  But it's not clear that this has any relation to cancer.

      The biggest exposure is observed with electric blankets:
sizable current, close to the body, used for long periods, used regularly.
There are now some low-field electric blankets with twisted-pair wiring.

					John Nagle
From: prob@btmp24.be (Pascal Roobrouck SH53)
Newsgroups: sci.electronics
Subject: Par PC-port bidirectional ??
Date: 10 Nov 92 14:05:16 GMT
Reply-To: prob@btmp24.be (Pascal Roobrouck SH53)
Organization: Alcatel Bell Telephone, Antwerpen, Belgium


I have a development kit for MCU's with a programmer that plugs into the
Centronics port of a PC. In the manual they say you need an AT. However
at home I have still an XT. The programmer software always hangs on my
XT when he tries to READ something from the Parallel port. (a blank
check..) On an AT at my office, it works fine ...

Here my question : is there a difference in hardware between the
centronics port implementation in the XT and the AT PCs or is it only
the manufacturers 'fault'. Maybe I could buy an extra parallel port for
my XT that works well ??

Greetings from Belgium

Pascal Roobrouck
e-mail prob@sh.alcbel.be  



~~/\~~
  `'
Newsgroups: sci.electronics
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: Teeny-weeny Sony power connector?
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Distribution: usa
Date: Thu, 12 Nov 1992 21:27:06 GMT
X-Newsreader: TIN [version 1.1 PL6]

Mouser has just started carrying the 1.3mm plugs. I thought RS had them
but not the jacks.
From: dmccarro@sedona.intel.com (David McCarroll)
Newsgroups: sci.electronics
Subject: Information wanted on EEPROMS
Date: 5 Nov 92 19:33:57 GMT
Reply-To: dmccarro@sedona.intel.com
Organization: Intel Corporation
Originator: dmccarro@sedona


I need a EEPROM for an application, but I can't not seem to
find one. Problem is that I don't know a manufacturer or
part number for one. Could someone send me information on
manufacturers of EEPROMS and maybe suggest some databooks
where I could get more information?
Thanks
From: ikoutsel@sdcc3.ucsd.edu (Ioannis Koutselas)
Newsgroups: sci.electronics
Subject: Re: beryllium copper
Date: 7 Nov 92 19:52:30 GMT
Organization: University of California, San Diego


Hello. I would like to
ask if someone knows wwhat is the minimum exposure level
to BeO, BeCu dust is ? I have accidentally played with BeCu
trying to make springs out of it, and I was never aware
of the fact that BeCu dust is also dangerous(I know, I know ...)

Is there a minimum level ?  Are the effects of Be chronic, ie
if you inhale once does it mutilates cells forever, or is there
some decay of its action in the human organism ?

Thank you

Ioannis Koutselas
(ikoutsel@sdcc3.ucsd.edu)

Newsgroups: sci.electronics
From: danr@ais.org (Daniel Romanchik)
Subject: Re: A/D For Sun
Organization: UMCC
Distribution: usa
Date: Thu, 5 Nov 1992 22:47:26 GMT

In article <1992Nov4.230233.11777@src.umd.edu> tedwards@eng.umd.edu (Thomas Grant Edwards) writes:
>I'm looking for A/D data acquisition systems, especially for use
>with Sun SparcStations.  Can anyone point me to a company which makes
>such systems?
>
   IOTech makes an A/D converter with a SCSI interface.  It connects
nicely to a Sun.  Their phone number is 216-439-4091.
    National Instruments makes a IEEE 488 interface for the Sun.  If
you wanted to go this way, you'd have to find a converter with an IEEE
488 interface. Their number is 800-433-3488.

Tell 'em both I sent you.

Dan
=====================================================================
        Dan Romanchik              |        danr@irie.ais.org
       Technical Editor            |         (313) 930-6564
   Test and Measurement World      |     MCI Mail: tmwromanchik
=====================================================================
   "You can't test in quality" --  ancient Test Engineering maxim
=====================================================================
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: Par pc-port bidirecti
Date: 13 Nov 92 04:22:26 GMT
X-Maildoor: WaflineMail 1.00r


    Pascal Roobrouck Sh53 entitled a message as 'Par pc-port bidirectional',
   on the 11-10-92  14:05 to All.
 PRS> I have a development kit for MCU's with a programmer that plugs into
 PRS> the Centronics port of a PC. In the manual they say you need an AT.
 PRS> However at home I have still an XT. The programmer software always
 PRS> hangs on my XT when he tries to READ something from the Parallel port.
 PRS> (a blank check..) On an AT at my office, it works fine ...

    If I remember the XT's port is implemented with some discret
    TTL parts and the AT utilizes an 8255.  BIG difference.

 PRS> Here my question : is there a difference in hardware between the
 PRS> centronics port implementation in the XT and the AT PCs or is it only
 PRS> the manufacturers 'fault'. Maybe I could buy an extra parallel port
 PRS> for my XT that works well ??

    Might work make sure you check it out with your program B4
    you sink any money into it!

 PRS> Greetings from Belgium

    Greetings from Buffalo.NewYork.United_States

                Stephen Cyberman@Toz.Buffalo.NY.US
             Mangled on Thu  11-12-1992  at 20:29:01

... Catch the Blue Wave!
--- Blue Wave/QWK v2.10
                                                                                           
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Fri, 6 Nov 1992 21:00:11 GMT
Subject: Re: HELP with COMPOSITE VIDEO signals
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> OK, so I'm a finicky purist, but the black level is NOT 0.33V when the video
> signal is inverted - it is 0.3V when the "right way up".  In your inverted
> world,  the black level should be at about 0.7V.

Sorry, Mike, but you're not a particularly exact purist! :-)

Assuming RS-343A signal levels, black is nominally 54 mV above blank, which
is the reference; if you insist on considering the sync tips as 0, then
blank would *nominally* be at 0.286V + 0.054V, or 0.340V up from the sync
tip - so the original answer was at least closer to correct.

Actually, there's quite a large tolerance on the location of the "black"
level with respect to "blank" - this difference usually being referred to
as the "setup", and speced (as I recall) as 7.5 +/- 5 IRE.  And the good ol' 
RS-170C standard - which is what many are using when talking about "NTSC" 
video, although the mapping between the two isn't that clean - uses a 1.4 V 
p-p signal, with 1.0V from blank to white and 0.4V from blank to sync.

And, as always, your mileage in the PAL/SECAM world may vary.  I'm not
up on the current practices in non-NTSC consumer equipment.


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Newsgroups: sci.electronics
From: doherty@melpar (Kevin Doherty)
Subject: Re: HELP: non-intrusive current sensor
Organization: E-Systems, Melpar Division
Distribution: usa
Date: Fri, 6 Nov 1992 14:22:17 GMT

mbattist@magnus.acs.ohio-state.edu (Mark A Battisti) writes:

>I need a current sensor (On/OFF) for a standard 110 AC line which
>gives a logic signal (5V).  I tried running the live line through a coil
>which I ripped out of a small transformer and then amplify the coil
>response w/op amps but I could not get this to work.

Mark, I suspect your problem was that you ran BOTH AC wires through the
coil.  This means there was zero net current to be measured (since the
current in each of the hot and neutral leads was equal and opposite).

Try running one of the wires thru the coil and see if that helps.

							Kevin
Newsgroups: sci.electronics
From: wrb@cbnews.cb.att.com (wallace.r.blackburn)
Subject: Re: Idea for LED sequencer
Organization: AT&T
Distribution: usa
Date: Thu, 5 Nov 1992 18:50:45 GMT

In article <Bx7Ez4.MIM@news.cso.uiuc.edu> rky57514@uxa.cso.uiuc.edu (Tall Cool One ) writes:
>heacock@kuhub.cc.ukans.edu (Doug Heacock) writes:
>
>>I'm putting together a quick-and-dirty circuit that will light 10
>>LED's in sequence, one after the other.  Here's my idea so far:  I
>>intend to use half of a 4011 (quad 2-input NAND gate) as a clock
>>oscillator to drive half of a 4518 (dual synchronous up counter),
>>which will in turn drive a 4028 (BCD-to-decimal decoder), which will
>>actually drive the LED's.  I was thinking I could connect all of the
>>LED cathodes to ground through a single 330-ohm resistor, since only
>>one would be lit at a time.
>
>>Does this sound workable?  I welcome more elegant solutions--these
>>chips just happen to be the ones I have on hand at the moment.
>>+-----------------------------------------------------------------+
>>| Doug Heacock, Academic Computing   | heacock@kuhub.cc.ukans.edu |
>>| Services, The University of Kansas | heacock@ukanvax.bitnet     |
>>| Lawrence, KS 66045                 | Amateur radio: N0NZQ       |
>>+-----------------------------------------------------------------+

Oh, what the hell?  Might as well give the "swatting a mosquito with a
sledgehammer" approach.

IF you have access to a programmer and IF you wouldn't mind writing some
very simple assembler (I know, pretty big ifs):

A tiny microcontroller like the MC68HC705K1 could do this easily and
cheaply.  The 'K1 has 10 I/O lines - one for each LED.  They can drive the
LEDs directly since they can source 25 mA.  The code would just be:


	START	BSET LED1	;turn on 1
		JSR  DELAY	;delay subroutine
		BCLR LED1	;turn it off
		BSET LED2	;turn on 2
		JSR  DELAY
		    .
		    .
		    .
		BCLR LED10
		JMP  START

I know this is overkill, but since the 'K1 sells in singles for $3.35 and
you would need no other chips, it's really not that crazy.  Physical design
becomes trivial and the software would take less than an hour (10 minutes).

I've been playing with this MCU a lot lately, so maybe it's a case of "if
all you have is a hammer, everything starts to look like a nail".

Comments to att!ccsitn!wrb, flames to /dev/null/eatme.


			Wally Blackburn AA8DX
Newsgroups: sci.electronics
From: gcouger@olesun.okstate.edu (Gordon Couger)
Subject: Re: Crystal-controlled FM XMTR?
Organization: Oklahoma State University, Stillwater
 used a TTL line though a voltage divider. Using the voltage divider to set
Date: Tue, 10 Nov 1992 05:19:35 GMT

Gordon Couger
AB5Dg   Agriculture Engineering Oklahoma State University
gcouger@olesun.agen.okstate.edu 405-744-6514 day 744-2794 evenings
From: fraser@praha.jpl.nasa.gov (Scott Fraser)
Newsgroups: sci.electronics
Subject: TV Commercial Zapper?
Date: 13 Nov 92 19:58:34 GMT
Organization: Jet Propulsion Laboratory

Recent radio commercials for a voice controlled TV remote control, mentions that it has the ability to zap through commercials that have been taped.  The question is... How do they do it?  without a closed loop system between the tape and the control, do they just advance the tape a fixed number of seconds? or is there some sort of information imbedded in the broadcast that enables them to tap into some previously unannounced features on our VCRs??  Its got me wondering?


Thanks, Scott 


*************---->>> Standard Disclaimers Apply <<<----********************
Newsgroups: sci.electronics