HDTenEightyP/NetNews huggingface dataset:
From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Re: Filtering TV Commercials
Date: 4 Sep 92 09:38:58 GMT
Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Organization: Dept Electrical and Electronic Eng, Manchester University, UK

>In <1992Sep03.042045.5095@ecst.csuchico.edu> rmintz@ecst.csuchico.edu (Rich Mintz) writes:
>
[.....]
>know where) and most importantly the little funny square. On our commerical
>stations two queue markers are sent at the right hand edge of the screen in
>the top 20 or so lines, these look to be some sort of tone which masks the
>signal underneath. The tv companies use these to que in local adverts in
>networked programmes. I think the first marker appears 30seconds before the
>adverts. So you could build a box to look for this and once its found it
>wait 30secs and kill the audio. However I dont know if this is present
>in US systems.
>
>Raggy
>

A similar system, that would work if the conditions are right is to
take advantage of the fact that most places in the UK can receive
two ITV regions (how true is this?), especially with a second aerial
(I'm fortunate that I can get both Granada and Central with one group
C/D aerial pointed at Winter Hill even though the Central transmitter
(Sutton Coldfield?) is group A in totally the opposite direction.

Anyway, usually both regions transmit the same peak time programs,
but opt out for local adverts. Therefore, all you need to do is detect
when the sound and/or video from the regions is significantly different.

Remember, your picture from the second transmitter needn't be perfect,
just good enough for your image processing / signal processing to
tell the difference.

This is just an idea, I haven't tried it.

Cheers
Mark
mark-r@spec0.ee.man.ac.uk
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: NTE or ECG database by FTP?
Date: 5 Sep 92 21:45:43 GMT
Distribution: usa
Organization: University of Georgia, Athens

In article <1992Sep05.162513.28886@ssc.wa.com> markz@ssc.wa.com (Mark Zenier) writes:
>mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>: Both NTE and ECG have semiconductor substitution guides on disk for the PC.
>: Are these guides available by FTP from anywhere?
>
>The salesdroid at the local distributor said that the data was
>encrypted.  After all, they wouldn't want you to be able to 
>build a reverse list and avoid the 400 percent markup.

Yes, but the software itself is freely distributed (at least NTE's is,
according to their advertising).  I don't want to crack it [well, not
immediately at least], I just want to use it.



-- 
+ Michael Covington - Artificial Intelligence Programs - U of Georgia - USA 
+ Unless otherwise noted, these are private opinions, not official statements.
+ VOTE NO GEORGIA LOTTERY - we need not imitate mistakes of other states.
Newsgroups: sci.electronics
From: ninke@cactus.org (Don A. Ninke)
Subject: Wanted: Schematic for Okidata 82A Printer
Organization: Capital Area Central Texas UNIX Society, Austin, Tx
Distribution: usa
Date: Tue, 8 Sep 1992 00:32:50 GMT

I need a schematic diagram for an Okidata 82A printer.
When it is executing too many sequential line-feeds
(feeding blank paper) the circuit breaker trips.  If I had
a schematic, I could figure out what part to replace.

I'll pay for copying and postage.
    Donald Ninke, 2307 Lehigh Drive, Austin, TX 78723
Thanks. !!

-- 
--------------------------------------------------------------------------
Donald Ninke, 2307 Lehigh Drive, Austin, TX 78723-2113       ninke@cactus.org
Newsgroups: sci.electronics
From: pzs@ficus.webo.dg.com (Peter Z. Simpson)
Subject: Re: Need encoding scheme for TV remote infrared controller
Date: 4 Sep 92 11:10:40
Organization: Data General Corp., Westboro, MA

>>>>> On Wed, 2 Sep 1992 00:35:40 GMT, mancus@roger.jsc.nasa.gov (Keith Mancus) said:

>   We're in the process of building a small robot, and we'd like it
> to respond to a TV remote control.  Can anyone tell us:

>   (1) Is there a standard carrier frequency?  The IR sensor we're using
> detects 40 MHz.

    40 Khz is about right. It depends on the mfr, of course, but most
of the ones I've seen use 40KHz.

>   (2) Is the encoding scheme standardized?  If so, what is it?

    *No*...the best way to figure it out is to hook the output of your
sensor to a digital storage scope or logic analyzer. Set it to
trigger on the leading edge of the first pulse received & look at what
each button sends. I did it with a short assembly program and printed
out a 1/0 pattern on the console. 

>  
>   (3) Are there any other pitfalls we should know about?

    Make sure your robot doesn't respond to the guy in the next office
adjusting his cable box :-)

    See if you can get a hold of an IR phosphor test card (Radio Shack
#276-099 @ $5.95) to check the output of the remote. Real handy for
when you don't know if the remote's sending anything or the sensor's
broken.

    Pete



    

--
  Peter Simpson, KA1AXY       (508) 870-9837  fax: (508) 898-4212
  Data General Corp.  E236    pzs@ficus.webo.dg.com [128.221.228.82]
  Westboro, MA  01580         #include  <std_disclaimer.h>   
Newsgroups: sci.electronics
From: torin.walker@rose.com (torin walker)
Subject: IGH SPEED PULSE TECH
Organization: Rose Media Inc, Toronto, Ontario.
Date: Sun, 6 Sep 1992 22:45:11 GMT
X-Gated-By: Usenet <==> RoseMail Gateway (v1.70)


Date Entered: 09-06-92 17:23
Hello there,

I am desparate to find and purchase the 4 volume set entitled:
HIGH SPEED PULSE TECHNOLOGY. Here are the particulars:


 Author:         Frungel, Frank B. A.

 Title:          High speed pulse technology, Frank B.A. Frungel. --

 Published:      New York : Academic Press, 1965-80.
 Description:    4 v. : illus. ; 24 cm.

 Other titles:   Impulstechnik. English

 Notes:          Translation of Impulstechnik.
                 Includes bibliographies.

 Contents note:  Capacitor discharges. Magnetohydrodynamics. X-rays.
                   Ultrasonics. -- v. 2 Optical pulses. Lasers. Measuring
                   techniques. -- v. 3. Capacitor discharge engineering. --
                   v. 4. Sparks and laser pulses.

 ISBN:           0122690036 (v. 3)


If you have a set or know where could I find one, please leave a message.

Please respond to: 'torin@torinet.com'  or  'uunet!torinet!torin'

---
   RR 1.60 R002389: I don't want it now, I want it RIGHT now!
   RM 2.00 : RoseNet<=>Usenet Gateway : Rose Media 416-733-2285
From: al@sys6626.bison.mb.ca (Haus Der Luge)
Newsgroups: sci.electronics
Subject: TESLA COIL - THANK YOU
Date: Thu, 10 Sep 92 22:27:26 CST
Organization: system 6626 BBS, Winnipeg MB

The responses to my asking for advice about TESLA coils have been 
overwhelming.
 
Thank you all for your help - I am on my own to making my own coil!
 
Please excuse any delays in my responding as I have received some 30 
plus mail messages pertaining to this subject.
 
HausDerluge


;--- (Haus Der Luge) a user of sys6626, running waffle 1.64
;E-mail: al@sys6626.bison.mb.ca
;system 6626: 63 point west drive, winnipeg manitoba canada R3T 5G8
Newsgroups: sci.electronics
From: ddm@hamby.tx.ncsu.edu (David Mann)
Subject: Strobe Lights
Organization: North Carolina State University
X-Newsreader: Tin 1.1 PL4
Date: Thu, 10 Sep 1992 14:49:29 GMT

Could someone give me some insight on how to trigger a Xenon strobe tube
(like from Radio Shack).  I used to have a schematic around here
somewhere [shuffle shuffle] but can't find it.  I can build my own
trigger circuit, but what kind of cap is needed, and what device would i
use to drain the cap into the tube?  Any help would be appreciated
(e-mail please, thanks).

--
You know, some white coral, painted brown, and attached to the skull with some 
common wood screws, can make a child look like a deer.
                                                   -- A Deep Thought
David_Mann@ncsu.edu
From: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Sync Separator summary
Date: 15 Sep 92 13:44:04 GMT
Organization: Dept Electrical and Electronic Eng, Manchester University, UK


Thanks to all who replied about my sync separator question. Nearly
every post told me to get an LM1881, and they seem reasonably priced
so that's the course I'll follow. Thanks also to Mika Iisakkila 
(iisakkil@vipunen.hut.fi) who suggested the following circuit for
the black level clamp:

MI>                ||100n
MI>   video in >---||--------o----> video out
MI>                ||        |
MI>                          |
MI>              ||220p    |-+
MI>  comp sync >-||--o---o-|   BS170
MI>from LM1881   ||  |   | |-+
MI>                 ---  |   |
MI>                 | | ---  |
MI>              4k7| | / \  |1N4148
MI>                 | | ---  |
MI>                 ---  |   |
MI>                  |   |   |
MI>                  +---o---o
MI>                          |
MI>                         -+-

Mark
--
_____________________________________________________________________
Multimedia Information Systems Lab | To err is human, to really screw
Dept. Of Electrical Engineering    | it up takes a co
University of Manchester           | Segmentation fault: core dumped
Dover St. Manchester. M13 9PL      |
Newsgroups: sci.electronics
From: dchouina@sobeco.com (Daniel Chouinard)
Subject: Re: How does a UART do it...
Organization: Sobeco Ernst & Young
Date: Mon, 7 Sep 92 18:31:35 GMT
Keywords: uart comms asynchronous


In sci.electronics you write:

>Given a stream of 1s & 0s, how does a UART get the character framing
>established, i.e. how is the 'start' bit differentiated from all the
>others? (I want to emulate one in software)

>Steve

I once wrote a terminal emulator for the Color Computer (TRS-80) that uses
its "bit banger" (no uart, just a PIA input).

1: Assume T being the period of half a bit. (That's 1/600th sec. for 300 baud)
2: Loop until receive line goes low. (Beginning of start bit)
3: Wait T three times (ignore start bit, end wait time in middle of first bit)
4: Get bit, shift it in register, wait T twice (go to middle of next bit)
5: Repeat step 4 six, seven or eight times, depending on word length.
6: Wait T twice (end in middle of stop bit)
7: go to step 2.

The framing's done in step 2.  Given a random stream of bytes, it synchronizes
after a while.

Uarts generally have a 1/16th timebase but use the same principle.

						dchouina@sobeco.com
						Daniel Chouinard
						Sobeco Ernst & Young
						Montreal, PQ, Canada.
From: gjw@dcs.glasgow.ac.uk (Mr Garry J. Wardrope)
Newsgroups: sci.electronics
Subject: Re: halogen lamp died, what is wrong?
Date: 9 Sep 92 08:15:28 GMT
Organization: Glasgow University Computing Science Dept.

jim@heart.seas.upenn.edu (Jim Streicher) writes:


>My halogen light recently died.

>It is rated at 500 watts and requires a "Type J" bulb.
>I replaced the bulb with a 300 watt one but nothing on the
>........

  The type indicates reliability and colour rendering and shouldn't make a 
lot of difference as to wheither it comes on or not.  A 300W lamp should
still work in a fitting rated up to 500W.  Your problem sounds more like a
component failure!

  Why don't you get (borrow?) an AVO and check the things.  Even new lamps
can be duds.  Check the lamp resistance - it should be pretty low ( few ohms )
check the fuse continuity and check the voltage on the pins. Remember though
if the lamp has a solid state dimmer you might not get what you would expect
out if there isnt any load (i.e. working lamp) connected.



		Garry
-- 
Mail:	Garry Wardrope, Computing Science Dept.,  Tel: (041) 339 8855 x5322
	Glasgow Univ., 17 Lilybank Gardens, Glasgow G12 8QQ, UK. 
email:	gjw@dcs.glasgow.ac.uk
".. and even if I came in sight of paradise what price its moon without Marsco"
From: smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC)
Newsgroups: sci.electronics
Subject: How does a UART do it...
Date: 7 Sep 1992 11:43:45 GMT
Organization: SunConnect
Distribution: world
NNTP-Posting-Host: hardy.france.sun.com
Keywords: uart comms asynchronous

Given a stream of 1s & 0s, how does a UART get the character framing
established, i.e. how is the 'start' bit differentiated from all the
others? (I want to emulate one in software)

Steve
From: raoul@eplunix.UUCP (Nico Garcia)
Newsgroups: sci.electronics
Subject: Re: Phone line bleeding - help
Date: 6 Sep 92 18:05:42 GMT
Organization: Eaton-Peabody Lab, Boston, MA

feiges@cae.wisc.edu (Howard Feiges):
> Now, we have two phone lines...  It seems to me that when people are on
> both lines - the person on one line can faintly hear the person on the
> other line talk - and visa versa...    

It's called "crosstalk". It can happen because a) your wiring is bad, and
there's a slight resistive path between your phone lines. To test this,
disconnect the phone company from your system and use an ohmmeter between
your phone lines, between every pair of wires. The red and green, line 1,
should have infinite resistance with the phones on-hook (or, say, 10 meg if
you've wired in certain types of in-use indicators). The same for black and
yellow, line 2. Black-red, black-green, yellow-red, and yellow-green should
be infinite. (Use appropriate color names for whatever color you've actually
uused!) If you've installed or are installing a bunch of in-use indicators
that use the same circuitry for both phones, you might have to re-think it.
They could be tying your phone lines together.

The other possibility is b) electromagnetic coupling. This is like a
transformer or capacitors: moving real currents in real wires creates real
fields that can be picked up on real wires near them. The longer the wires
run next to each other, the better the coupling between them. Think of your
phone wires as a transformer without a core, unrolled all over your house.

The best way to stop this is to a) run your wires separately, or b) use
twisted pair. By twisting the red-green and yellow-black pairs at different
rates, you reduce the coupling a lot. Twisted pair wire has this done for
you. The flat silver wire, with all four wires in a plane, should only be
used for short runs (from the phone to the socket, say).

Your modem doesn't care because it's faint, and your signals are much
stronger than the noise from the other line. Your ears, however, are very
good at picking up background speech at much lower volume levels.

Let us know what you find out.....


-- 
			Nico Garcia
			CIRL/MEEI
			eddie.mit.edu!eplunix!raoul
Organization: Queen's University at Kingston
Date: Thursday, 10 Sep 1992 10:34:44 EDT
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: GAL LOGIC
 <92253.131631LEEK@QUCDN.QueensU.CA> <1992Sep9.200458.8595@adobe.com>

In article <1992Sep9.200458.8595@adobe.com>, pngai@adobe.com (Phil Ngai) says:
>

I would assume that this post is a reply to mine...

>Would you program an Intel EPROM with a Toshiba algorithm?

Not really if I know my chip is an Intel.  I haven't seen the Toshiba
algorithm for EPROM, but I do know that NS programming algorithm is
significantly different.  They use 6.25V 100uS pulses and no overpulse.
Programming a chip other than the recommended parameters from the
manufacturer might cause prematured aging and might overstress the
chip itself causing reliability problems in the long run.

BTW a lot of the EPROM chips have the manufacturer ID as well as
the product ID.  This tells any good programmer the type of
algorithm to use.  (My homebrew programmer does that, but none of
the PD/magnezine even mentioned it.)

>What if Toshiba had trademarked "EPROM", would that make
>any difference?

What about Intel's FLASH (TM).  It is some sort of field programmable
ROM that follows the similar pin out, but can be reprogramed without
the need for UV.  Would you program it blindly the same way as
Toshiba's EPROM ?  What about battery backed SRAM ?  FRAM ?

A trademark identifies a line of products so that it won't be confused
with something similar.  I mean is there any difference between

  PAL16V8     (one-time programmable, fuse based, AMD)
  GAL16V8     (EEPROM based, erasable, Lattice)
  ispGAL16V8  (EEPROM based, but with 4 extra pins for in system
               programming, Lattice)

 There is also a CMOS EPROM based chip that has to be erased by UV.

Once the chips are programmed, they are pretty much the same.  The
difference is the process they are maded.  This affects the programming
parameters, interfaces and whether or not they can be reprogrammed.

I can't just go into a store and ask for 16V8 and expect the product
I wanted.  On the other hand I did specify GAL16V8 and got PALCE16V8.
I could have asked my Credit Card company to cancel payment as I
didn't get what I specified.  a Cyrus 486 is the same as an Intel 486?
(Cyrus 486 is sort of stripped down Intel 486 workalike in a 386 pin out.)

>What's your definition of GAL anyway?

GAL(TM) stands for Generic Array Logic.  Trademarked by Lattice and
second sourced by National Semiconductor and SGS-Thomas (sp?).
The GAL prefix is marked implictly on the chip and is the prefix part
of the part#.

PALCE(TM) by AMD and their chip has PALCE as the prefix part of their
part number.

Any of the companies can sue if their competitor put on their
trademark to confuse the comsumer.  Intel did that to AMD, but 386
the number cannot be tradmarked.  On the other hand, OverDrive, FastCad
etc can be.

>My opinions are my own.

Vote for Murphy Brown !!

K. C. Lee
Elec. Eng. Grad. Student (in a place called Canada...)

PAL, PALCE: tradmarked by AMD.
GAL, ispGAL: trademarked by Lattice
OverDrive, FastCad: Trademarked by Intel
From: dcg5662@hertz.njit.edu (Dave Grabowski (KxiK))
Newsgroups: sci.electronics
Subject: RE's Universal Descrambler
Date: 12 Sep 92 06:37:54 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.
Originator: dcg5662@hertz.njit.edu


  I'm considering building the Universal TV Descrambler featured in
Radio Electronics back in March (or was it May?) 1990. I'm wondering if
anyone has built this unit, and if so, I'm curious about what kind of
results you've had.

  Any feedback is greatly appreciated. E-Mail me and I'll summarize if
there's interest.

-Dave
-- 
-----------------------------------------------------------------------------
Kappa Xi Kappa - Over & Above!                         dcg5662@hertz.njit.edu
9 Sussex Ave., Newark, NJ (car theft capital USA)   70721.2222@compuserve.com
Newsgroups: sci.electronics
From: kevin@clsi.COM (Kevin Cameron)
Subject: Re: A much better power inverter design
Originator: kevin@dubhe
Organization: CAD Language Systems Inc.
Date: Fri, 11 Sep 92 20:36:25 GMT


In article <BuE4p8.5Bq@acsu.buffalo.edu>, v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:

> So most manufactuers use mosfet power supplies
> that step up the 12vdc to higher levels by first providing a 60hz
> oscillating signal and using power mosefets to switch the 12v power
> to a step up power transformer which results in a larger square wave ac
> voltage output.

- it will probably be at a much higher frequency than 60Hz e.g. 50kHz

> ... But the mosfets although
> amazing devices have internal resistances that cause them to heat up a lot
> under heavy current loads.

But you can just put more in parallel if you need a lower resistance, that
will be more reliable than relays.

Kev.
-- 
Kevin Cameron          CLSI, Suite 100, 5457 Twin Knolls Rd., MD 21045, USA
kevin@clsi.com         Tel: (USA) (410) 992 5700 (- 5709) X229
uunet!clsi.com!kevin   Fax:       (410) 992 3536
----------------------------------------------------------- Reality Is virtual
Newsgroups: sci.electronics
From: jeremym@fraser.sfu.ca (Jeremy Thomas McDonald)
Subject: Re: DC voltage doubling question
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Sat, 5 Sep 1992 21:16:00 GMT

Try the TC7662A.  This will only accept 3-18V input but it is a start. 

Newsgroups: sci.electronics
From: pzs@ficus.webo.dg.com (Peter Z. Simpson)
Subject: Re: Speech chips
Date: 2 Sep 92 11:11:15
Organization: Data General Corp., Westboro, MA

>>>>> On 31 Aug 92 20:49:36 GMT, freed@europa.orion.adobe.com (Alex Freed) said:


> Hi, 

> A few years ago even the Radio Sh** used to carry some speech chips. Now that
> I need to play with one, I can't find them anywhere. The question is:
> Does anyone know a source of simple-minded chip capable of saying a few simple
> words like numbers and letters? I know one was discribe in a book I once read
> but I forgot which one. Thanks.

    Try Active Electronics...(800) 677-8899

    They claim, on page 69 of their 1991 catalog, to sell the Microchip (formerly
General Instrument Microelectronics) SP0256-AL2 (their part number
21142) for $9.75 

    BTW, that's the same part Radio Shack used to sell.


--
  Peter Simpson, KA1AXY       (508) 870-9837  fax: (508) 898-4212
  Data General Corp.  E236    pzs@ficus.webo.dg.com [128.221.228.82]
  Westboro, MA  01580         #include  <std_disclaimer.h>
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: A much better power i
Date: 12 Sep 92 23:29:27 GMT
X-Maildoor: WaflineMail 1.00r


   Neil Gandler was whineing about 'A much better power inver',
   on [09-11-92  01:41] to All!
 NG> heat up a lot under heavy current loads. So I tried a mechanical method
 NG> using 2 high speed quality relays. The design amazingly worked with
 NG> little problems, like noise from the 60-hz modulated relays, a small
 NG> amount of magnetic intereference which can be solved and slightly warm
 NG> relays. The only major problem I can see is reliabilty. How many cycles
 NG> can a relay take before they burn out, thats the only question. I must
 NG> do more work and improve on this. Another small problem is

    Actually this is how early car voltage regulators worked.

 NG> irregularity, relays are not perfect bounceless switches and spikes and
 NG> irregularities on the scope show up frequently on the square wave ac
 NG> output. I have yet to try this with a power amplifier. Overall the
 NG> major advantage is cost including no expensive mosfets, no large metal
 NG> heatsinks and little waste and its small size makes it perfect for a
 NG> car. The only real source of heat is in the step up transformer. I am
 NG> not an enginneer yet and I doubt that I found something new. I am open
 NG> to any questions, opinions and comments and would like to know if I
 NG> have something here. Thankyou

    This is actually wrong.  The MosFets are much more efficient.
    The problem is most invertors are SQUARE wave generators.
    Another is the POWER FACTOR.  If you have had network
    analysis and anything on power tranmisison, the power factor
    (PF here on) is a phase angle bettween the current and
    voltage in  a tranmission line.  This wastes power if the PF
    is not equal to zero.

    On large factories they have large banks of capacitors to
    correct this (high inductive load).  This is ussually done
    with a "simple" calculation that has to be VERY precise.  :)

    to reduce size here are some common techniques Use high
    frequency modulation (>25khz) this will allow you to use a
    MUCH smaller transformer. and boost efficiency.

    Use PWM and pass the signal through the small high frequency
    xformers.  then use a low pass filter on the output

    So whatthe heck was I talking about the PF for?  Well the
    latest and greatest is active PF correction.  So you must
    design a circuit that will allow you to dynamically alter the
    capacitive load and inductive loading for the circuit.  This
    will boost your efficiency of a miesly 75-85% to closer to
    85-99%.

        Stephen Cyberman@Toz.Buffalo.NY.US
        Scripted at Sat  09-12-1992  10:04:36

... To detect or not to detect AT&C!
--- Blue Wave/QWK v2.10
     
Newsgroups: sci.electronics