HDTenEightyP/NetNews huggingface dataset:
From: jgd@dixie.com (John De Armond)
Newsgroups: sci.electronics
Subject: Re: Dynamotors;
Date: 12 Sep 92 08:47:48 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.

In article <larryd.716229475@milton> larryd@milton.u.washington.edu (Larry Desoto) writes:

>Dynamoters...you forgot the true dinosaurs of High Voltage.  The proper
>technique when using dynamotor powered ARC-5 transmitters was to press
>the mike key and wait a second or so until the motor was up to speed.
>It really brings back memories of adding another battery to the car's
>electrical system to bring the voltage up to 24 volts for the dynamoters.

I have the Mother of all dynamotors.  About 1200 volts at an amp or so.
No idea what it came off of.  Hamfest prize.  I built it into a fish
shocker for my father in law to use to "harvest" fish from his ponds.
A couple of hunks of copper pipe hung inside perforated milk jugs (for
safety out of the water) make up the electrodes.  Just drop 'em down
til the ammeter reads about an amp, wait for a moment and scoop up the
fish.  Sucks the guts out of a trolling motor battery. :-)  It's a 
sight to see running slightly overloaded.  Fire flying from both ends,
ozone permeating the air and the wickedest snarl I've ever heard 
come from a motor.  Probably just scares the fish up :-)

John


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.
Xref: sparky sci.electronics:15540 rec.video:11188
From: chu@hanauma.jpl.nasa.gov (Eugene Chu)
Newsgroups: sci.electronics,rec.video
Subject: Re: Macrovision
Date: 12 Sep 92 10:07:54 GMT
Organization: SAR Systems Development & Processing, JPL

In article <2859@perl-sun.dwrsun4.UUCP> perl@dwrsun4.UUCP (Robert Perlberg) writes:
>
>Some years ago a VCR maker (forgot which one) came out with a machine
>which used a different kind of AGC circuit which was not affected by
>Macrovision.  It was not their intention to defeat Macrovision, it just
>worked out that way because Macrovision takes advantage of an
>unintended behavioral characteristic of the extant AGC circuit.  The
>Macrovision people complained and the VCR maker modified the new
>circuit so that it would reject a Macrovision signal.
>
>Robert Perlberg

My old Sony Beta machine has never failed to record any tapes protected
by Macrovision.  I'm told this is quite common, as beta is supposed to
be unaffected by Macrovision.  However, I also have a newr SLV 585 HF
that has successfully recorded a few Macrovisioned tapes that a friend's
JVC could not handle.  Could it be that Sony's AGC circuits are too slow
to respond to Macrovision's interference?

eyc
-- 
>:<  Me:  Eugene Chu (Mr. Butterfly)        | Radar Science & Engineering  >:<
>:<  chu@hanauma.jpl.nasa.gov               | Jet Propulsion Laboratory    >:<
"T'is better to light a single candle than to curse the darkness"
But t'is so much easier to curse the darkness.
From: bills@inqmind.bison.mb.ca (Bill Shymanski)
Newsgroups: sci.electronics
Subject: Tesla Coils
Date: Thu, 03 Sep 92 19:32:59 CDT
Organization: The Inquiring Mind BBS  1 204 488-1607

Check your friendly local newstands for info; the project this month
in either Radio-Electronics or Popular Electronics happens to be
a Tesla coil.  Idea if you've been asking yourself " What can I
do with that 3000 feet of magnet wire I've got ?"
   Bill


bills@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics
From: provost@vlsi.polymtl.ca (Benoit Provost)
Subject: Re: RE's Universal Descrambler
Organization: Ecole Polytechnique de Montreal
Date: Sun, 13 Sep 1992 03:19:11 GMT

	I did not do the RE's descrambler, but I know somebody who did, and he  talked a lot to me about it.  He said it was working fine, except for several 
litle details.  For example, the synchronizing for the horizontal and vertical
are not automatic (but I think they mentionned it in the article).  You have
to reajust it with the two pushbutton every time the descrambler has to 
resynchronize (when you switch channels).  Once the horizontal and vertical
bars are set, the stability is good, but not perfect (I think he told me
that was due to a passive filter).

	He is now trying to make the synchronizing automatic and to improve
the stability.  He is trying to make the color inversion automatic, too (you
have to reajust it every time you switch channel).

							Svann Le Terrible.

--
Benoit Provost                   |   Pattison's law of electronics:  t
provost@vlsi.polymtl.ca          |   if wires can be connected in two  a
Ecole Polytechnique de Montreal  |   different ways, the first way        yl
Montreal, Quebec, Canada         |   blows the fuse.
Xref: sparky sci.electronics:15423 comp.sys.sun.hardware:4307
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics,comp.sys.sun.hardware
Subject: Sparcstation serial port
Summary: +- 5V not 12V ?
Date: 9 Sep 92 20:35:50 GMT
Distribution: usa
Organization: University of Georgia, Athens

Can anyone tell me anything about the internal circuitry of the serial
port in a Sparcstation?

Also, am I right in thinking Sparcstation serial ports output + and - 5 V
rather than the usual 9 to 12 volts on an RS-232 port?

-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
Newsgroups: sci.electronics,rec.radio.amateur.policy,alt.folklore.urban
From: karn@servo.qualcomm.com (Phil Karn)
Subject: Re: Is this legislation for real?
Organization: Qualcomm, Inc
Distribution: usa
Date: Mon, 7 Sep 1992 05:26:41 GMT

In article <1992Sep6.070933.16476@porthos.cc.bellcore.com> whs70@dancer.uucp (22501-sohl) writes:
>The last version of this I saw (it was part of the FCC funding bill
>for 1992) did not have a Total ban that included existing equipment,
>BUT it did set a future date (6 months I think) after which 
>manufacturers would have to have eliminated any cellular frequency
>coverage from any receiver they manufactured.  There was no exception
>for test equipment, etc.

What's really silly about this is that by the time the ban starts
taking effect (if indeed it has any effect at all), the easiest and
most direct way to intercept the next generation of digital cellular
telephones won't be to use a conventional scanner, it'll be to modify
a digital cellular telephone. And these will, of course, be quite
widely available.

Phil
Newsgroups: sci.electronics,alt.guitar
From: jsgn3@fel.tno.nl (Jos Groot)
Subject: Re: Building effects units for guitars
Organization: TNO Physics and Electronics Laboratory
Date: Tue, 8 Sep 1992 08:09:46 GMT

grey@bnr.ca (Bryan Miller) writes:

>One good thing to say for the practicality of DSP and
>the home dabbler:

>Effects programs can be distributed electronically.
>It's a lot harder to email a legible schematic and
>etch a board :)

>If you program in a 'portable' language like C and
>get a public domain compiler for your DSP, you're
>flying for pretty cheap if you can get at least part-
>time access to a computer.

>It's a totally different type of guitar hacking,
>to be sure :)

>Grey

I read the above message in alt.guitar, but my email directed
to `grey@bnr.ca' bounced, because the user `grey' is unknown at
`bnr.ca'. So I post this question initially directed to Grey here,
and encourage other people to react also.

Some weeks ago I built a simple 8-bit AD/DA board to be used in a standard
PC. It is possible to sample (with the AD) and play back (with the DA) at
frequencies up to 400 kHz. With my 386 I am able to implement a real-time
digital reverb and echo in Turbo Pascal, while still sampling at over
40 kHz or so. Now I would like to implement (just for fun) some of the
fancier effects.

I wondered whether readers have DSP algorithms (or pointers to them) to get
well-known guitar effects, like flanging, phasing, chorus or distortion.


Thanks in advance, Jos Groot


-- 
Jos Groot (jos.groot@fel.tno.nl)
Physics and Electronics Laboratory TNO-FEL 
P.O.box 96864
2509 JG  The Hague, The Netherlands
Newsgroups: sci.electronics,rec.video.cable-tv
From: mxl@cbnewsg.cb.att.com (marc.a.levy)
Subject: Re: RE universal sync restorer trouble
Organization: AT&T
Distribution: usa
Date: Tue, 15 Sep 1992 12:02:35 GMT

In article <1992Sep14.154038.17079@resumix.portal.com> David W. Hawkins <dwh@resumix.portal.com> writes:
>I have assembled the universal sync restorer described in the
>May '90 issue of RE and it's not quite working. A friend of
>mine has assembled one as well and his works fine. So we've
>tried to compare what his is doing to what mine is doing.
>We can't find any difference at all, yet his works.
>

I also built this project, and was informed of a few "Fixes"
that should be added to improve/Clean up the performance of
this project.  I did get mine to work, but found that I could
not get the color's to look good and it was a hastle to set
up, so my board sits in the closet, unused.

I may have the list of fixes somewhere, if anyone is
interested.  And if anyone knows of a way to fix the horrible
color problem on mine, I would like to hear from you.

Thanks.


Newsgroups: sci.electronics
From: arnofr@duteca.et.tudelft.nl (Arno F. Roelofs)
Subject: 4pin RGB -> 3pin RGB ?
Originator: arnofr@duteca.et.tudelft.nl
Keywords: RGB
Reply-To: arnofr@duteca.et.tudelft.nl (Arno F. Roelofs)
Organization: Delft University of Technology, Dept. of Electrical Engineering
Date: Mon, 14 Sep 1992 13:51:30 GMT

I am trying to connect the analog RGB output of my computer (Amiga) to
a Reuters CM120-MV monitor. The amiga has an RGB output that is
compatible with SCART (I think), it has three color signals in the 1V
range and a separate composite sync line.
The monitor has only three inputs, being two normal color lines
and a combined color/sync one. The combined one is the green input.
The range of the input signals is also 1V.

Does anyone know a good way to combine the analog green and composite
sync signal into one signal?

I have tried a couple of simple setups myself and I am pretty sure
that it can be done relatively easy, since the monitor works fine if I
plug the composite sync line of the computer directly in the green
input of the monitor and disconnect the green output of the computer.
The picture has no green in it of course but it is stable.

Any help would be appreciated.

Arno Roelofs (arnofr@duteca.et.tudelft.nl)
From: plumpe@oasys.dt.navy.mil (David Plumpe)
Newsgroups: sci.electronics
Subject: Re: How to drive 1 or 2 segments (ONLY) of a Liquid Crystal Display ?
Date: 10 Sep 92 15:42:07 GMT
Reply-To: plumpe@oasys.dt.navy.mil (David Plumpe)
Distribution: usa
Organization: Carderock Division, NSWC, Bethesda, MD

In sci.electronics, tidedu@mars.lerc.nasa.gov (William T. Dedula) writes:
>Hello All;
>I am building a project which requires a LCD counter. I am using
>MM74HC4543's to drive each of the 4 digit's BUT I need to drive
>a few special indicators on the LCD panel such as a LOW BATT
>indicator. I'd like to know how I can do this ? Would the normal
>proceedure be to use another MM74HC4543 or is there a simpler way ?
>
    Use an XOR gate (74HC86, etc.).  Connect one XOR input to the signal
you want to indicate ("Low Batt" comparator output); drive the other
input with the LCD backplane clock signal; connect the XOR output to
the LCD segment ("LOW BATT").  When the first XOR input is low, the
output is in phase with the backplane clock and the segment is blank;
when high, the XOR inverts, the output is out of phase and the segment
is visible.

-DaveP
Newsgroups: sci.electronics
From: robin@uhunix.uhcc.Hawaii.Edu (Robin Amano)
Subject: capacitors
Organization: University of Hawaii at Manoa
Date: Sat, 5 Sep 1992 22:41:55 GMT


Anyone know where I can get good size electrolytics?
Low ERS, Panasonic SU or TS series would be good.
i.e.  220uf @ 300V, etc.
Thanks!!



--
--------------

rob
uhcc
Xref: sparky sci.electronics:15457 comp.sys.sun.hardware:4326
From: gws@gwssun.att.com (Gary Sanders)
Newsgroups: sci.electronics,comp.sys.sun.hardware
Subject: Re: Sparcstation serial port
Date: 10 Sep 92 19:07:20 GMT
Distribution: usa
Organization: AT&T

In article <1992Sep9.203550.25943@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>Can anyone tell me anything about the internal circuitry of the serial
>port in a Sparcstation?
>
>Also, am I right in thinking Sparcstation serial ports output + and - 5 V
>rather than the usual 9 to 12 volts on an RS-232 port?

The Sparcstation 2 (and I think 1/1+) has a jumper on the mother board
to select RS232 or RS423 signaling levels.

-- 
Gary W. Sanders (N8EMR)
gary.w.sanders@att.com		
AT&T Bell Labs 
614-860-5965 
Newsgroups: sci.electronics
From: schmidt@auvax1
Subject: Re: Filtering TV Commercials
Organization: Adelphi University
Date: Sun, 6 Sep 1992 15:54:36 GMT

In article <1992Sep03.042045.5095@ecst.csuchico.edu>, rmintz@ecst.csuchico.edu (Rich Mintz) writes:
> I'm interested in building a device (or making my 386sx 
> act like one) that will be able to distinguish television 
> commercials from television programs. I've talked to a 
> few people and have heard of a couple of ways it is said 
> that this can be done.
>  
> First, I was told that the audio during commercial 
> announcements on tv is boosted higher than that used for 
> normal programs (for obvious reasons). However, I've 
> tried all kinds of analysis with volume levels, averages 
> over specific periods of time, etc, using my computer's 
> sound card (with stereo capability), with no luck at 
> finding any dependable pattern to distinguish    ads from 
> shows.
>  
> Someone else told me they had heard that what I'm wanting 
> can be acomplished by analyzing the video transmission 
> for the presence of computer-encoded information that 
> accompanies programs, but not commercials. I assume he 
> was referring to Closed-Captioned (CC) text sent along 
> with many shows for the benefit of the deaf who have 
> special receivers for these signals.
>  
> Any suggestions? Thanks.
>  
>    Rich -> rmintz@cscihp.ecst.csuchico.edu
> 

You are going to have real problems.  First of all, some commercials come from
the networks, some from the local stations, and some from syndicators, already
in the program.  The audio in the commercials is held a little low, at least by
the networks, to keep the FCC from being deluged by "loud commercial"
complaints.  Most local stations process their audio (AGC) fairly hard, so
everything comes out pretty much the same level.  Many commercials are
closed-captioned these days.  There used to be a box (or at least plans for
one, perhaps in Radio-Electronics), which sensed the momentary switch to black
which accompanied most commercials (they usually are inserted after the program
is already taped, so there often is a moment of black before them) and switched
the signal off for 30 or 60 seconds, but now with commercials of 10, 15, 20, 30 
60, etc seconds, and 5 second teases, there would be no way to know when to
come back, and there are a lot of moments of black between scenes, news
stories, etc.  

If there was a way to do this, it would be a big seller at electronics stores,
believe me!!

John

-- 
*******************************************************************************
John H. Schmidt, P.E.              |Internet: schmidt@auvax1.adelphi.edu
Technical Director, WBAU           |Phone--Days     (212)456-4218
Adelphi University                 |       Evenings (516)877-6400
Garden City, New York 11530        |Fax-------------(212)456-2424
*******************************************************************************
Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: Do LIGHT PENS work with VIDEO PROJECTORS?
Date: Tue, 08 Sep 92 18:00:40 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 

howcome@media.mit.edu (Hakon Lie) writes:
>Do light pens work with video projectors?
>I'm involved in a project where we want to use a pointing device on a
>back-projected screen. We're playing with the idea of using a light
>pen to track the position of the pointer, but will it work?
>Do e.g. Nintendo guns (which are based on light pen principles I
>presume) work if you send the video signal to a projector instead of a
>TV set?  If yes, great -- tell me about it. If no, why not?
>Some reasons why it may not work:
>The projector in question uses three small CRTs (one for each RGB) to
>display the image. Each CRT has a electron beam that hits and lights
>up the phosphor which is projected onto the large screen through the
>lenses. Maybe the electron beams are not in sync? Or perhaps the
>characteristics of the phosphor in the CRTs are different from the
>phosphor found in TV sets?

      Ought to work just fine with ordinary 3-CRT NTSC projection TVs.
There's nothing exotic in there, just a color TV with separate output
tubes for each color, mixed optically.  The Nitendo gun should work
just fine.  You could even use the Nitendo shoulder-fired rocket launcher
for dramatic effect.  

      The device called "Gold Brick", which is usually used to interface
PowerGloves to Macs, is supposedly a general-purpose interface for Nitendo
peripherals, so it should be possible to interface a gun that way.

      You might have trouble with some of the more exotic projection
TVs.  Ones with a frame buffer and resolution doubling by interpolation
exist.  These have nonstandard frame timing.  LCD-based projectors
are much too slow for light pen operations, of course.

					John Nagle
Newsgroups: sci.electronics
From: Mark-Tarbell@suite.com
Subject: Try this with your DMM
Reply-To: suite!tarbell@uunet.uu.net
Organization: Suite Software, Anaheim CA.
Date: Wed, 9 Sep 1992 00:09:07 GMT

Have you ever tried to get a DMM to measure its own battery voltage?

It seems that one must decouple the input from the battery terminals,
but there must be a trick to it (I'm using a .01mfd disc cap).

What happens is that the display cycles +/- 2 volts around the true
value, but never settles down, seeming to indicate a ground loop.

Any ideas?
Xref: sparky sci.electronics:15604 rec.video:11230
From: killeen@spcvxb.spc.edu (Jeff Killeen)
Newsgroups: sci.electronics,rec.video
Subject: Re: Macrovision
Date: 14 Sep 92 05:27:17 GMT
Organization: SPC Community Access System

In article <1992Sep13.180739.25369@steam.rome.ny.us>, strike@steam.rome.ny.us (Strikemaster) writes:
> killeen@spcvxb.spc.edu (Jeff Killeen) writes:
> 
>>Keep in mind 8mm and Hi8mm units are _not_ effected by Macrovision.  Owners of 
>>Sony GV-8/200/300/500's have long ago discovered this happy fact.  Also I 
>>believe all Beta units are safe from Macrovision.
> 
> Hmmm.  If "The Addams Family" is Macrovision encoded, then I beg to differ
> with you.  Recorded from a JVC S-VHS deck to the CCD-V700 camcorder, I get
> the same brightness/contrast changes I expect from a VHS tape.

How did you have the V700 connected to the TV?  If you connected it through 
your VCR that is what is causing the problem.

>Probably a FAQ, but what "copy guard" formats are there besides
>Macrovision?

The older system was "Guardian" which caused synch problems which resulted in 
rolling problems.
Newsgroups: sci.electronics
From: anbo@wuee1.wustl.edu (Albrecht Jander)
Subject: Re: TROUBLE TRYING TO FIND A WAY TO DRIVE ALPHA NUMERIC DISPLAYS
Organization: Washington University, St. Louis Mo.
Date: Wed, 9 Sep 1992 19:36:47 GMT

In article <1840070@hpsad.sad.hp.com> smithj@hpsad.sad.hp.com (Jim Smith) writes:
>In sci.electronics, v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:
>
>>    I am trying to design a stereo receiver and would like to indicate
>>    functions and status using alpha numeric displays. For example for
>>    my surround sound processor. When someonechooses matrix. The word
>>    matrix appears on the display in alpha numeric characters. Is there
>>    a chip that will convert a 4 or 8-bit signal and output an alpha
>>    numeric display to the appropriate letter you choose. Then I could multiplex
>>    this and have a 6-segment alpha numeric driver. I would appreciate any
>>    help.
>
>You can buy an entire alphanumeric display that accepts serial data and
>displays ASCII characters.  The Optrex LN2111R-10, for example, is a 
>2 line by 16 character display, and is $20 in single quantities from Digikey.
>I suggest you call Digikey at 1-800-344-4539 and ask for their latest
>catalog.  (No, I don't have anything to do with Digikey.)
>
>Good luck.
>	       - jim
>
One minor error, these modules do not accept serial data, but as desired
by the original poster, they do work with either 4 or 8 bit data.  There
are a couple of other handshaking signals that need to be implemented also.

These LCD modules are really slick.  They (like many other manufacturers')
use the Hitachi HD44780 driver chip which takes care of most everything.
You can send it a variety of cursor movement/ display shift commands, as 
well as download 8 user defined characters.  Very easy to use!!!

Oh, if anyone knows the phone number for Gateway Electronics, try them also.
They have some older units for only $5.

Albrecht



---------------------------------------------------------------------------
                        Peltier was a cool dude!!
Newsgroups: sci.electronics
From: cretney@cbnewse.cb.att.com (joseph.e.cretney)
Subject: Transistor Cross Reference Help Needed
Organization: AT&T NETWORK SYSTEMS - Network Software Center - Lisle, IL
Distribution: na
Date: Tue, 15 Sep 1992 17:51:36 GMT
Keywords: Dumb Engineer Needs Help




HI,
It's been a long time since I've done analog so bear with me.
I have a Fisher audio amp that's somewhat fried and I was looking
for info on how I can cross reference these transistors to get
an idea on what it's going to take to repair.

All of the transistors are mark such as the ones below.  I'm pretty sure
these three are toast but I cann't figure out how to cross reference to a 
replacement part.  

Any Suggestions?????
      ___________  	      ___________  	      ___________  
     |     _     |	     |     _     |	     |     _     |
     |    (_)    |	     |    (_)    |	     |    (_)    |
     |           |	     |           |	     |           |
     |           |	     |           |	     |           |
     |   D612K   |	     |   B632K   |	     |   C2911   |
     |           |	     |           |	     |           |
     |  F    5A  |	     |  E    4A  |	     |  T    5B  |
     |           |	     |           |	     |           |
     |___________|	     |___________|	     |___________|
       |   |   |	       |   |   |	       |   |   |
       |   |   |	       |   |   |	       |   |   |
       |   |   |	       |   |   |	       |   |   |
       |   |   |	       |   |   |	       |   |   |
Thanks 
Joe Cretney
att!nwsca!cretney
From: pauls@trsvax.tandy.com
Date: 15 Sep 92 08:55 CDT
Newsgroups: sci.electronics
Subject: Re: TESLA COIL - THANK YOU
Message-ID: <288200009@trsvax>
Nf-ID: #R:<FsBXqB3w164w@sys6626.bison.mb.c:-34:trsvax:288200009:000:50
Nf-From: trsvax.tandy.com!pauls    Sep 15 08:55:00 1992


Maybe you could assemble them into a tesla FAQ??
From: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Newsgroups: sci.electronics
Subject: Re: Question about origin of name of BNC connector
Keywords: BCN connector, name origin
Date: 9 Sep 92 14:25:00 GMT
Reply-To: gmw1@cunixa.cc.columbia.edu (Gabe M Wiener)
Organization: Columbia University

In article <1992Sep8.205843.12516@vela.acs.oakland.edu> lmbrown@vela.acs.oakland.edu (lmbrown) writes:
>I think that the BNC stands for Bayonet Connector.  Can anyone confirm or
>disprove this?

British Naval Connector is how I learned it...


--
Gabe Wiener - Columbia Univ.     "This 'telephone' has too many shortcomings 
gmw1@cunixa.cc.columbia.edu       to be seriously considered as a means of 
N2GPZ in ham radio circles        communication. The device is inherently of
72355,1226 on CI$                 no value to us." -Western Union memo, 1877