HDTenEightyP/NetNews huggingface dataset:
Organization: Queen's University at Kingston
Date: Thursday, 23 Jul 1992 22:44:58 EDT
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: Differentiating a 2716 and 2764

In article <1992Jul23.011017.27028@doug.cae.wisc.edu>, kolstad@cae.wisc.edu
(Joel Kolstad) says:
>
>Hi,
>
>I'd like to know how an EPROM programmer can go about differentiating between
>having a 2716 and 2764 inserted into it.  The only thing I can think of

There is some neat stuff like an Electronic Signature in the newer EPROMs
.  The ID tell the programmer about the manufacturer and the device code
used by the manufacturer.  They tend to use different codes.  :(
Not all chips carry this code, but a lot do.

Applying a 11.5V to 12.5V voltage on pin 24 of a 28-pin device. (I would
use a large resistor to limit current in case the device do not support
the ID codes.)  An address of 0000 gives you the Manufacturer codQ and
0001 the device code through the data pins.

I am still in the process of collecting these codes.  I
designed an
Eprom programmer with the ID feature, under full software control for
2716 to 27512 (no personality modules nor dip switches).  It had been
on the shelf since last summeras it still lack a usable database of
these codes, an integrated Hex Editor and some good doc.  So if someone
can point me source for these, please email me.

>So... that's my method.  Does anyone else have a good method to do this?
>Thanks!

I would apply power to Pin 28.  If there is current through Pin 28, then
you have a 28 pin device.   :)  You can also ask the user to read off
the part # or even a microswitch in the socket. :) :)

Personally I assumed a 28 pin device and try to read off ID.  If ID
is not in database, then the user has the honour of selecting it in
a pull down menu.  If it is in the database, then the user have the
option of using it or ignoring it.

Please let me know if you need more info.  Unlike GAL/PAL/PLD's, I do
have info that I can share without breaking any agreements. :)

>                                                ---Joel Kolstad

K. C. Lee
Elec. Eng. Grad. Student
Organization: European Space Research Institute (ESRIN)
Date: Wednesday, 22 Jul 1992 14:08:49 SET
From: Mike M. Skala <MSKALA@ESRIN.BITNET>
Newsgroups: sci.electronics
Subject: Re: Shocking stories
 <14i293INN1ef@agate.berkeley.edu> <brriza.6zu@wang.com>


There's is a special museum in Vienna, where they took
us young budding electronics engineers every second
year to *show* us, that the stuff we were playing
around with, could bite.
"Elektropathologisches Museum". Says it all.

There was a backroom with some pickled remains
and another one we were never allowed to see,
where it was rumored they kept some parts of the guy
who pissed from a railroad bridge. True!

Some of the really smart ones included:

The guy who tried to drive his fishing baits out of
the ground using two long pieces of wire, an extension
cord and 220 VAC. Barefooted in the early morning dew.

The lady in the bathtub, whose water grew cold.
She reached out, grabbed the electric heater
standing nearby and put it in with her.
I'm still surprised that she got that far.

Morbidly yours,
                mike

--
Mike M. Skala
mskala@esrin.bitnet

"Seegnatur'? I don't got to show you no stinkin' seegnatur!"
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: Dolby B/C? (A??)
Date: 28 Jul 92 18:30:01 GMT
Organization: Kernel Mode Consulting, San Diego, CA

In article <1992Jul23.113150.7221@ohm.york.ac.uk>, u9dmlb@ohm.york.ac.uk 
(Duncan McL Barclay) writes:
> 
> Well in a nutshell Dolby A was developed for the recording industry 

right so far.  

> and used about more than 3 bands 

"about more than three"???

> which were equalised
> depending on signal level. When Dolby wanted to produce a consumer
> version they produced Dolby B which has 2 bands to which EQ is
> applied coz it was cheaper than doing the full Dolby A. 

No.  No.  No.  Dolby noise reduction is not an EQ system.  It is a dynamic
range compander (compression on recording, expansion on playback) system. Since
Dolby nr affects different audio frequency bands differently (ie Dolby B or C
tapes played on a non-Dolby deck sound overly "bright", and you can correct
this to some extent by turning down the treble), you may think of it as
"equalization".  

But the key difference here is that EQ is a static thing, ie the same EQ curve
is used throughout a recording, whereas the action of a compander depends on
the signal level being recorded or played back. 

Full-bandwidth companders are fairly old hat.  What Dolby A nr did that was new
was to derive four different control signals from four different audio bands,
and use them to control companders which operate only in those respective
bands.  The result was a marked reduction in "pumping" and "breathing" and
"noise tails" which were associated with simple full-bandwidth companders. 

dbx, incidentally, is a sort of a cross-breed.  Its compander operates on the
entire audio band, but its control signal is derived not from a full-bandwidth
"level" but from a proprietary filter network that samples just a few key
frequencies.  

Dolby B has just one band.  (If you like you could think of Dolby B as having
two bands, one which it processes and one which it leaves strictly alone, but
this is REALLY stretching a point.) 

Dolby C similarly has just one band, but does about twice as much compression
as Dolby B.  

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh
Organization: Queen's University at Kingston
Date: Thursday, 23 Jul 1992 18:40:48 EDT
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: 20W Audio amplifier chip TDA1520
Distribution: usa

In article <64120@hydra.gatech.EDU>, gt8021a@prism.gatech.EDU (EASON) says:
>
>I remember that RS had a (10W?) stereo audio amp chip, but these are single-
>channel.  The chip is a 9-pin SIP with dimensions around .5" x 1" x .2".

Yeap.  I once built an Stereo amp with that.  I think it was more like
5.8W.  I blew the chips about 6 months later due to my mistake and
couldn't get a replacement as it was off their catalog.  I like the
National Semiconductor LM1875 chips.  They are in TO-220 and give up
to 25W and pretty rugged.  Also their low cost, availability (from
Jameco) and low component counts is very hard to beat.

I have only blew 1 in last 3 years or so (in spite of the fact that this
one has a pair of 18,000uF caps and a heavy duty power supply) while
the other ones last a shorter time under my attack of the soldering iron.

K. C. Lee
Elec. Eng. Grad. Student
Newsgroups: sci.electronics
From: aaronb@suhana.analog.ingr.com (Aaron B.)
Subject: Video Modulator from Atari 5200
Keywords: Video Modulator
Reply-To: aaronb@suhana.analog.ingr.com
Organization: Home Office Enterprise
Date: Thu, 23 Jul 1992 17:09:41 GMT

I open up a broken Atari 5200 video game, thinking of extracting the
Video Modulator from it.  I found the box that says RF modulator, but
I cannot figure out the pins on that thing.  It has 5 pins, I identified
the GND and the Output pin but not the other three.  It also uses
CA3086 (I thought all Video Modulator uses MC1374 :-)).

If anyone has any idea on this sucker, please e-mail your response.
I might have to disassemble the box to figure it out.

Thanks in advance.

Aaron B.
aaronb@suhana.analog.ingr.com
From: "peter gottlieb" <peter.gottlieb@channel1.com>
Newsgroups: sci.electronics
Subject: shocking stories
Date: 21 Jul 92 01:59:03 EST
Reply-To: "peter gottlieb" <peter.gottlieb@channel1.com>
Distribution: sci
Organization: Channel 1 Communications

NJF>Ok. I want to know from the net people. What is the largest voltage shock
NJF>you have ever received (and survived.) I am not talking about rewiring
NJF>a light switch. I am talking about kissing the flyback transformer.

I was once repairing a defibrilator and got myself across the main
capacitor bank.  Enough for 10, 400 joule shocks since I dropped the
voltage from 450 down to about 25.  Blew me off the lab stool and
across the room, and I was shaking for the rest of the day.

Don't try this at home.

---
  OLX 2.2  Friction is a drag.
--
Channel 1 (R)   Cambridge, MA
From: ivory@e7sa.epi.syr.ge.com (John Ivory)
Newsgroups: sci.electronics
Subject: Novice phone questions
Date: 22 Jul 92 13:47:27 GMT
Reply-To: ivory@e7sa.epi.syr.ge.com
Organization: Tower Concepts


I'm new to this news group, and am trying to brush up on some
long forgotten EE skills.  I appreciate your patience and
assistance.

I want to build a few convienence devices for my home phone, and
want to tap into the incoming leads.

- Where can I get good documentation on the signals, voltages, etc
  for the phone lines?
  
- What FCC issues will I have to deal with if I hook in?

- How do I detect an incoming ring, and the subsequent human pickup
  of the phone somewhere in the house?

- I can make the unit be battery run, but would prefer to tap the energy
  from the ring signal.  Is this possible?  How?

- Does this group have an FAQ?  Where/how can I get it?

Thanks for any/all help.

John Ivory
ivory@e7sa.epi.syr.ge.com
From: davei@comp.lancs.ac.uk (Mr D Ingles)
Newsgroups: sci.electronics
Subject: Re: Gerber previewers / converters
Date: 22 Jul 92 15:17:12 GMT
Distribution: sci
Organization: Department of Computing at Lancaster University, UK.

In article <IISAKKIL.92Jul19162225@vipunen.hut.fi> iisakkil@vipunen.hut.fi (Mika R Iisakkila) writes:
>
>Has anyone met any (preferably free) software to preview Gerber
>photoplot files or convert Gerber to other graphics formats?
>Almost any platform will do. The following features would be
>appreciated:

There is a gerber plot previewer on the SIMTEL archive (and its mirrors).

Davei
From: tonya@hpldsla.sid.hp.com (Tony Arnerich)
Date: Wed, 22 Jul 1992 21:28:58 GMT
Subject: Re: AC-Regulator exists(?) for 12VAC Halogen Lamp
Organization: HP Scientific Instruments Division - Palo Alto, CA
Newsgroups: sci.electronics

u_banzai@mcl.ucsb.edu (Buckaroo Banzai)  writes:

> I have a 12VAC Halogen desk lamp that loves to flicker and dim a lot.

> I recently opened up the base which had a 110<->12VAC transformer, a three-way
> rocker switch (it has two brightness levels, and off)

> The secondary outputs go either center tapped, for dim or full(?) tapped for
> brighter.

> I'm wondering if there's a capacitor/choke/coil combination or AC line
> regulator for the low-voltage AC side.

> Any info on usage, sources, or helpful hints would be great.

Yes, you can get "AC Regulators" - American Design Components ( (800)
776-3700 ) has a constant voltage transformer, rated at 8 amps, 120VAC
output, 95-130VAC input, for $50.

But what you should do is replace the switch. There's only a 0.00001%
chance that anything else is wrong.

tonya@hpldsla.sid.hp.com
Xref: sparky sci.electronics:13567 rec.video:9748
From: jmd@bear.com (Josh Diamond)
Newsgroups: sci.electronics,rec.video
Subject: Re: Optically scanned TV (was Re: Blue Lasers)
Date: 29 Jul 92 16:32:40 GMT
	<1992Jul28.123009.2910@ucsu.Colorado.EDU>
	<1992Jul28.230043.12414@mailhost.ocs.mq.edu.au>
Organization: Bear, Stearns & Co. - FAST
In-reply-to: johnh@macadammq.edu.au's message of 28 Jul 92 23:00:43 GMT


In article <1992Jul28.230043.12414@mailhost.ocs.mq.edu.au> johnh@macadammq.edu.au (John Haddy) writes:

   The quality of colour of a Sr laser has to be seen to be truly appreciated!
   Unfortunately, our He-Sr laser, being recombinant in operation, will only work as
   a pulsed source (5-10kHz). For projection TV use, this forms a slight problem -
   not fast enough to display 1 pixel per pulse, and pulse durations too short to
   display sections of a picture frame.

Can't you use a couple of these lasers, and run the output through a
few kilometers of fiber for pulse compression?  I seem to recall a
buddy of mine doing something like this back when I was in
undergraduate school...

				Josh Diamond
				AKA Spidey!!!


--
 /\ \  / /\  Josh Diamond                              		   jmd@bear.com
//\\ .. //\\ AKA Spidey!!!                        ...!ctr.columbia.edu!ursa!jmd
//\((  ))/\\
/  < `' >  \          Beauty is the purgation of superfluities. -- Michelangelo
Newsgroups: sci.electronics
From: rpmackin@student.business.uwo.ca (Robert Patrick MacKin)
Subject: HELP: I need schematic for WYSE 60 terminal.
Organization: University of Western Ontario
Date: Fri, 31 Jul 1992 13:39:27 GMT

I have a WYSE terminal ( WY-60-02-02 ) and it has been hit with a surge
through the power.  I think the switching supply is gone, but I have no
schematics for any of it.  I need the wyse 60 because it emulates a 
wyse50 which is what a ROLM REDWOOD telephone system insists on having to 
program it. ( unless you suffer through a 400 set )
I tried using procomm emulating a wy100 but it did not send back the 
correct response to a "who-are-you" sent out by the system.
So, I need to know the response sequence if anyone knows it, just to fool 
the switch with a terminal program.

Any suggestions about the PSU?
Thanks for you time...

rpmackin@student.business.uwo.ca (Robert Patrick MacKin)
Western Business School  --  London, Ontario
Newsgroups: sci.electronics
From: eystein@smyril.fi.uib.no (Eystein Dugstad)
Subject: WANTED: National Instruments' email address
Organization: University of Bergen, Norway
Date: Sat, 25 Jul 92 16:35:24 GMT

I need to get in touch with someone at National Instruments and since  
email is the cheapest and fastest from overseas, I need their email  
address.

Please email to eystein@smyril.fi.uib.no

Eystein Dugstad
University of Bergen, Norway
Newsgroups: sci.electronics
From: mcmahan@netcom.com (Dave Mc Mahan)
Subject: Re: Pressure Transducers?
Date: Mon, 27 Jul 92 16:36:55 GMT
Organization:  Dave McMahan @ NetCom Services 
Keywords: transducers

 In a previous article, ifau241@ccwf.cc.utexas.edu (Phil) writes:
>Netones: Do you know of any 'solid-state' pressure transducers?
>I recall seeing a construction article somewhere that described
>their use in altimeters. (I need a transducer that can measure
>static atmospheric pressures.)

Motorola has just announced a series of solid state pressure transducers.
These are the MPX7100 and MPX7200 parts.  They use a single piezoresistive
strain gauge and on-chip temp compensatoion.   The MPX7100 is designed for
0 to 15 psi ranges and the MPX7200 operates in the 0 to 30 psi range.  Each
works from -40C to +125C.  To order tech data, call the Motorola
literature line and ask for manuals:

AR502S/D
BR121/D Rev 5
MPX50/D Rev 1
MPX2010/D Rev 2
MPX2100/D Rev 3
MPX2700/D
MPX5050



>ifau241@ccwf.cc.utexas.edu

  -dave
-- 
Dave McMahan                            mcmahan@netcom.com
					{apple,amdahl,claris}!netcom!mcmahan

Newsgroups: sci.electronics,alt.folklore.urban
From: moroney@ramblr.enet.dec.com
Subject: Re: SHOCKING STORIES
Organization: Digital Equipment Corporation
Date: Sat, 25 Jul 1992 03:47:46 GMT

>In article <1992Jul18.175339.10396@newstand.syr.edu>,
>
> Ok. I want to know from the net people. What is the largest voltage shock
> you have ever received (and survived.) I am not talking about rewiring
> a light switch. I am talking about kissing the flyback transformer.

Largest voltage?  Probably one winter when I scuffed my feet across the
rug or pet the cat vigorously and touched the doorknob or something...
Thousands of volts but no current.

Worst shock: I had the power transformer from an old tube TV set.  I was
testing the filaments of some tubes, and the leads I thought were the 6.3V
windings were the ones for the B+ plate supply.  Either 350 volts or 700 volts
at a not insignificant current arm to arm, depending whether I grabbed the
center tap lead or not. Threw the tube I was testing across the room...
I wasn't hurt somehow.

Then there was one time that could have been bad.  I was walking home after a
severe thunderstorm and I felt a tingling in my legs.  Then I noticed the live
powerline on the ground nearby, quietly buzzing and sparking away. Remembering
reading about step charges once, I walked away taking _tiny_ steps.  There was
a police cruiser at the other end of the street parked across the street until
the electric co. got there and took care of it.  Stupid cop made no effort to
keep people coming the other way out of danger.

-Mike
Newsgroups: sci.electronics
From: jim@rwsys.lonestar.org (James T. Wyatt)
Subject: Re: Q and Z on phone
Organization: R/W Systems, Richland Hills, Texas, USA, 76118-5849
Date: Tue, 28 Jul 1992 06:02:43 GMT

In article <19JUL199215280050@gamma.is.tcu.edu> barkman@gamma.is.tcu.edu (MYLES BARKMAN - KG5AI TX A&M U) writes:
>Just FYI, Kenwood has placed QZ on the 1 key of their newest hand-held ham
>radio.

Howdy neighbor!

Is this to support the remote ham call by letters stuff? I guess the FCC
just didn't have the foresight to use only DTMF-labeled letters in calls. 8{)



-- 
James Wyatt  KA5VJL  jim@rwsys.lonestar.org  Semper Gumbi - always flexible!
From: mcmahan@netcom.com (Dave Mc Mahan)
Newsgroups: sci.electronics
Subject: Re: CD ROM reference?
Date: 24 Jul 92 20:12:18 GMT
Organization: Dave McMahan @ NetCom Services


 In a previous article, downin@oasys.dt.navy.mil (Dave Downin) writes:
>I was just wondering if there was any kind of reference manual on CD
>ROM for electronic components.  Basically something that would let me
>look up chip #'s and transistor #'s and tell me what they are.  Maybe
>even give a stats sheet or pinout on the component.

Yes, there is.  Actually, I think there are several.  We are investigating
one from the makers of the D.A.T.A. book series.  One disk is the 'index'
and gives you the ability to search and cross-reference a part or look for
desired characteristics.  It also lists makers of substitutes.  The other
60 or so CD disks contain scanned images of data books.  (I was told that
they have about 60 disks, I haven't confirmed it yet.  This seems like a
huge number to me, but I guess it could be right).  We are getting one of
the systems in for 30 day evaluation next week.  If you have specific
questions about it, send me e-mail in about 2 weeks.


>-Dave Downin

  -dave

-- 
Dave McMahan                            mcmahan@netcom.com
					{apple,amdahl,claris}!netcom!mcmahan
From: wdlee@ccwf.cc.utexas.edu (david lee)
Newsgroups: sci.electronics
Subject: Pressure Transducers?
Keywords: transducers
Date: 24 Jul 92 21:38:56 GMT
Reply-To: ifau241@ccwf.cc.utexas.edu (Phil)
Organization: The University of Texas at Austin

Netones: Do you know of any 'solid-state' pressure transducers?
I recall seeing a construction article somewhere that described
their use in altimeters. (I need a transducer that can measure
static atmospheric pressures.) I seem to recall that they were
made in silicon using microlithography techniques.
Any Ideas?
Thanks, David
Please Reply directly to:
ifau241@ccwf.cc.utexas.edu
From: marcusj@apricot.co.uk (Marcus Jenkins)
Newsgroups: sci.electronics
Subject: Re: Radar Detectors, and Radar Detector Detectors
Keywords: Radar
Date: 28 Jul 92 08:17:21 GMT
Organization: Apricot Computers Limited

medin@catbyte.NoSubdomain.NoDomain (Dave Medin) writes:

><BBC stuff deleted>

>Well, not quite. "Detector detectors" are designed to look for leakage power
>at common IFs (intermediate frequecies) of the device they're trying
>to detect. This works if the receiver they're trying to detect is
>of "superheterodyne" type, which most TV sets and radar detectors are.
[... stuff deleted...]
>The set or radar detector has an oscillator(s) inside it which is used
>to mix down the incoming carrier frequency of the TV/radar to a lower
>frequency more easily filtered and processed. The IF oscillator(s)
>will have some leakage to the outside world where it can be
>detected by a tuned receiver or spectrum analyzer. Try this
>sometime... common TV IF's are 75 and 10.4 MHz. Listen in on
>your set's IF leakage with a general coverage receiver. The leakage power
>is in the 10's of milliwatts, usually. Try 220 MHz for your radar
>detector...

I understand, and this may well be completely apocryphal rumour, that
British TV's must emit a *minimum* amount of IF specifically so they
can be detected by detector vans.  I understand that there are ways
(that have been printed in passim amateur electonics magazines) to
'shut your TV' up.  I assume these involve shielding (baking foil) around
the inside of the rear case of the receiver and inserting a high pass
filter in your antenna feed.  Has anybody got some more concrete info-
rmation on this?


 _ _ _
' ) ) )                         Internet: marcusj@apricot.co.uk
 / / / __.  __  _. . . _        UUCP: marcusj@apricot.uucp
/ ' (_(_/|_/ (_(__(_/_/_)_      If all else fails from US, try:  
Marcus Jenkins                  apricot!marcusj@relay.EU.net
Tel: +44 21 472 3002  Fax: +44 21 471 2935
Disclaimer:  Anything I wrote above is, of course, my own view and
             does not in any way represent my employer.
Newsgroups: sci.electronics
From: rivan@bnr.ca (Robert Ivan)
Subject: Re: SHOCKING STORIES
Reply-To: rivan@bnr.ca
Organization: Bell Northern Research Ltd.
Date: Tue, 21 Jul 92 14:18:18 GMT

  When I was a wee one I had this car set.  Since I had  the 
the concept that there was a transformer in the system
that setepped down the vultage to my car track I had an IDEA.
"what fools are these toymakers ... if they just got rid
of the transformer ( and stop charging the extra) my cars
would go wayyy faster".  So I decided to test my theory (budding 
electricel engineer ) so after removing one of those little
dc motors and attaching stripped down wire paper ties ( i had no real wire)
I proceeded to stick this thing into the AC outlet.  WOW did that motor
run fast zeeeeeeeeeeeeeeeeeeeeeeeeeeee.   Since I was holding the motor in
my hands i got the full shock, burned out the fuses and my poor little motor
just fried.   Beter to run fast and die young .......


 Then in high school in my electrical class I found this really big coil.
it just so happened that I also found a nice peice of metal which slid
nicely back and forth in the coil ( this was one mother of a solenoid).
So I attached this thing to a 500 volt line without thinking where i 
aimed the thing. Fliped the switch. BANG. Blew out the fuses and the
coil kicked accross the table. I found the metal peice imbeded in my 
lab partners geometry kit 6 feet away.  Everything in the kit was destroyed.
My partner was not amused. Had he been leaning forward a few inches more
he'd have been TOAST .  A biger version would have worked great in SDI. 


And then there was the time ......

Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
From: derbyc@tplrd.tpl.oz.au (Derby Chang)
Subject: Re: Life after CDs
Organization: Telectronics Pacing Systems
Distribution: na
Date: Wed, 29 Jul 1992 22:17:13 GMT

I thought the way they make CD's with a longer running time was to use the
extra space on the edge of the disc.  The European style of CD, where the
entire disc is coated with aluminium allows this.  The Japanese method,
with the clear centre area, and outer rim seems to be restricted to a
running time of a bit above 70 min.  The longest time I have seen is some
82 min, and it is a Deutsche Gramophon disc.

Derby.
.