HDTenEightyP/NetNews huggingface dataset:
From: snydert@dmapub.dma.org (Tony Snyder)
Subject: Re: 150 - 200 W. Amplifier
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]
Date: Thu, 21 Jan 1993 19:36:11 GMT

: I am continually amazed at the witchcraft ethos among high-end audio
: enthusiasts, who spend thousands of dollars on expensive capacitors, circuit
: boards, speaker wire, etc., and then rationalize their expenditures by claiming
: to hear sound improvements which can't be measured or verified by any objective
: tests. Good design practice stipulates using the cheapest components and
: simplest circuits that will get the job done.  Oddly, the high-end audio 
: market seems driven by the reverse notion that one should spend the maximum
: money possible (e.g., on hundred dollar patch cords), for benefits that exist
: entirely in the mind of the purchaser. I guess the phenomenon is testimony to
: the power of advertising and the influence of techno-mumbo jumbo (quartz-locked
: this and digitally sampled that and linear phase non-inverting blah blah
: blah)on impressionable minds.

You evidently are flying pretty high on some sort of an electrical 
engineering degree or something.  Your educators failed you by not 
covering such important technological topics such as Bragging Rights
and Cognitive Dissonance.  Such a shame.
From: agodwin@acorn.co.uk (Adrian Godwin)
Newsgroups: sci.electronics
Subject: Re: Wanted : Nicad Charger Plans
Keywords: cell battery alkaline charging duracell
Date: 22 Jan 93 13:48:24 GMT
Organization: Acorn Computers Ltd, Cambridge, UK


How about a charger for Alkaline cells ? I've seen one in a UK hobby magazine
using a system of periodic charge/discharge at 50Hz, but the charge time 
figures they presented didn't make sense.
So I built a version that I was happier with, but performance seems poor 
(long charge time, recharged cells don't hold their charge well).

Has anyone here got figures for the optimum charge rates for 
'non-rechargeable' cells in various sizes, and from various manufacturers ?

UK alkalines are normally marked 'do not recharge' with dire warnings
regarding leaks and explosions. Since some other countries (Japan ?) 
apparently positively encourage recharging, I'm dubious about these
warnings : they might be sheer protectionism, or a fear of product
liability. Or they might use inferior products in this country, since
they seem to be able to get away with it.
Are similar warnings printed in other countries ?


-adrian



-- 
Adrian Godwin : agodwin@acorn.co.uk : adrian@fangorn.demon.co.uk : g7hwn@gb7khw
ObDisclaimer  : I believe this rubbish .. don't imagine that anyone else does.
Newsgroups: sci.electronics
From: snydert@dmapub.dma.org (Tony Snyder)
Subject: Re: Modem on Pulse Phone Service?
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]
Date: Sat, 23 Jan 1993 13:49:02 GMT

GNR100@psuvm.psu.edu wrote:
:            Is there a way to buy or modify a modem so that it can be used on
: a phone system that uses pulse service instead of touch tone?

:                               Gordon Rogers
:                                  gnr100@psuvm.psu.edu

Gordon,
	You should have no trouble using virtually any fairly modern 
modem on either kind of phone service.  I have pulse service and have
been using a number of different modems, both old and new, and they all
work fine.  Once the connection is made phone lines work the same.  I'm
guessing that you may be having trouble dialing and making the connect.
If that is the case your dialing string should be ATDP555-1232 instead
of ATDT555-1232.  (substitute your desired number.)  Note the last letter
the P and T determine how your modem will dial.  Once the modem dials
it should be clear sailing from there.  
	If you have any more questions, well, repost or mail me.

                           Tony

      I guess I'm not much for tag lines.  I may have to change that.
Newsgroups: sci.electronics
From: laird@pasture.ecn.purdue.edu (Kyler Laird)
Subject: need RS-485 info and chips
Organization: Purdue University Engineering Computer Network
Date: 26 Jan 93 19:05:46 GMT

I want to use RS-485 interfaces for my latest home automation design.  (I
think I do, at least.)  Currently I'm in need of interface chips.  I hope
to keep things simple, and wouldn't mind spending a couple extra dollars
to save assembly/design time.  If there's a simple +5V only RS-485
transceiver chip available, I'd appreciate a pointer to it.

I'm planning on running around 4800 baud.  Can I run power, send and
receive on pairs of twisted wire without much interference (to the network
and to appliances).  Also, how many transceivers can I put on a line?  I
was once told that the limit is 31.

We're planning to close on a house in April, so I'm past the "just
thinking" stage.  I'm getting a bit anxious.  Any help will be greatly
appreciated!

--kyler
Newsgroups: sci.electronics
From: hoffman@cmf.nrl.navy.mil (Eric Hoffman)
Subject: Re: 68HC11 and 68681
Organization: Connection Machine Facility, NRL
Date: Mon, 25 Jan 1993 05:36:14 GMT


Please ignore the preceeding post. 

The DUART, as one would expect, functions on the bus perfectly well.

The area I had it mapped to, $d000, which was supposed to have
been reserved for a DUART, seems to be occupied by some internal
device or mysteriously disabled.

sorry to bother you (collectively)
From: tpm@ecs (TP Monks)
Newsgroups: sci.electronics
Subject: Home rf comms
Date: 25 Jan 93 10:07:38 GMT


Can someone say what the rules are for unlicensed rf short range comms in
the UK?   Presumably a range of frequencies is set asside for use of
garage openers and car bleepers below a certain power.

Can someone give me a ref on this?

Thanks,

Tim
--
-----------------------------------------------------------------------------
Tim Monks                                Vision, Speech and Signal Processing
tpm@ecs.soton.ac.uk                                    Southampton University
Tel: +44 (703) 592774                                   Fax: +44 (703) 592895
Newsgroups: sci.electronics
From: Mike Diack <mike-d@staff.tc.umn.edu>
Subject: MK38P70 chips wanted
X-Xxmessage-Id: <A78D0CB9B703650E@dialup-slip-1-14.gw.umn.edu>
X-Xxdate: Thu, 28 Jan 93 04:08:25 GMT
Organization: persian cat & carpet co.
X-Useragent: Nuntius v1.1.1d7
Date: Wed, 27 Jan 1993 14:59:43 GMT

Just that - anyone have any of these for sale ?
They look like a standard 40 pin cerdip with a 24 pin eprom socket
on top.
cheers
Mike.
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Laser Mania: Lasers for sell
Date: 25 Jan 93 11:27:04 CST
Organization: University of Kansas Academic Computing Services


Got some different HeNe modules this time. These are idenical to the other
modules but produce 1.2mW to 1.5mW output. They also have the 
intergrated high voltage power supply that runs off of +12vdc. However, these
are multimode which means they have a wide beam. The beam can be narrowed down
with a minus lense though. Also, the side is milled out of the housing so that
the lasing action inside the plasma tube can be seen. These are great lasers
for teaching or training purposes. Due to the wide beam output, I am selling
these for $30 each plus 5$ shipping. 

I also scrounged a Spectra Physics model 124 HeNe laser and power supply. The
laser was manufactured in 1981, but the tube was re-gassed in 1991. It is in
excellent condition and produces +19mW. I am asking $2,000 or best offer plus
shipping.

For those interested in agron lasers, I have aquired two American 60X
multi-line heads. They produce about 80mW each in 488Nm to 514Nm (blue/green).
I am selling the heads for $1000 each. But, just for your info, Meredith
Instruments has Cyonics model 2201 argon lasers with power supplies that
produce 25mW blue only (488Nm) for $1200. They are selling the head for $695
(I'm thinking about one of those myself ;-) Thier address is:

Meredith Instruments
P.O. Box 1724
5035 N. 55th Ave
Glendale, AZ 85301
1-602-934-9387

In case anyone is wondering, I'm not making a profit on these lasers. I'm a
laser fanatic and I know there are others out there like me. I sell them for
what I paid for them to pass the saving on to you. Nothing I hate more than the
surplus dealers ripping people off with a cost to you of 2 or 3 times of what
they paid for it. Through years of beating the bushes, I have found out where
and how these guys get thier lasers. I'm paying the price they pay for them,
then pass that cost on, nothing more. If you have a specific laser need, let me
know and I will try to get the best price I can for you (definetly less than
what the surplus markets what for them).

-=-= Wes =-=-
Newsgroups: sci.electronics
From: mathias@solomon.technet.sg (Mathias Koerber)
Subject: Rechargeable Batteries
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 25 Jan 1993 13:37:07 GMT

I asked this on misc.misc already...

What is the latest word (or the authoritative word) on handling
rechargeable batteries. Some people say only to store them fully
charged. Other claim that you have to totally dis-charge them every
once in a while. 

Any tips?


--
Mathias Koerber	                    | Tel: +65 / 7780066 ext 29
SW International Systems Pte Ltd    | Fax: +65 / 7779401
14 Science Park Drive #04-01        |
The Maxwell, Singapore Science Park | email: mathias@solomon.technet.sg
Singapore 0511                      |        swispl@solomon.technet.sg
-------------------------------------------------------------------------------
* Eifersucht ist eine Leidenschaft, die mit Eifer sucht, was Leiden schafft *
Newsgroups: sci.electronics
From: u009@csx.cciw.ca (G. Stewart Beal)
Subject: Re: Source for rubber sheets
Organization: Canada Centre for Inland Waters
Date: Thu, 21 Jan 1993 15:19:14 GMT

In article <1jlmbbINN8p8@news.cerf.net> jgallego@cyber.net (Jose Gallego) writes:
>I am looking for a source for rubber sheets such as the ones used on the
>bottom side of most mouse pads.
>

Visit a local Dive (SCUBA) shop. The stuff you want is standard wet suit
material.
 
Regards, Stu Beal, VE3MWM, U009@CSX.CCIW.CA,
National Water Research Institute, Burlington, Ontario, Canada.
 
"We'd made it through yet another nuclear winter and
 the lawn had just trapped and eaten it's first robin." - Kyle J. Spiller
From: wk0x@ANDREW.CMU.EDU (William Stephen Kish)
Newsgroups: sci.electronics
Subject: good UARTs ?
Date: 24 Jan 93 15:56:56 GMT
Article-I.D.: andrew.AfMoXce00axaI6MvwX
Organization: Carnegie Mellon, Pittsburgh, PA


I need a good UART (or DUART) for a project.  Do any stand out from the
rest in terms of ease of control or performance?

Thanks,
Bill Kish
kish@cmu.edu
Newsgroups: sci.electronics
From: hinz@bonfire (David Hinz (hinz@picard.med.ge.com))
Subject: Re: pulse  oximetry
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL8]
Date: Wed, 27 Jan 93 06:17:41 GMT

J. Babb (babb@sciences.sdsu.edu) wrote:

<Jibberish Med-Speak deleted>

: I've got a coupla questions:
:  I went into the hospital for a procedure and had an oximeter taped to my
: right index finger, afterwards I asked the doctor if I could have the
: sensor
: It had only ONE LED and Phototransistor, Not two. From this they got not
: only
: my pulse but blood oxygen level, too.
: The book referenced above is not available to me, is too expensive ($200!),
: and doesn't cover the one LED method anyway. Can anyone shed some light
: (other than 660 and 925nm, :-)   on this. 
: Jeff

Jeff,

Pulse oximetry works, in the 2 LED method, by looking at the absorbtion
raitos of the 2 frequencies of light.  Oxygenated hemoglobin will absorb
one of the frequencies, and non-oxygenated hemoglobin will absorb the other.
By comparing the amount of each that are absorbed, you can find the ratio of
one to the other, and derive from that the percent of available hemogloben
that is oxygenated.

Things get more complicated <of course>, when CO (Carbon Monoxide) enters
the picture, because it binds quite tightly to hemoglobin, but does not show
up with an optical pulse oximeter because it absorbs a totally different
frequency, I suppose.  So, you could be suffering from CO poisoning and still
have your Pulse Ox show, say, 97% which is about normal.  Even though you 
aren't getting enough O2 to your body, the pulse ox can't see the problem.

OK, that's how the 2-led system works.  Anyone have any idea about the 1-LED
system?  Unless perhaps it was two devices in one can?  How many leads did it
have on the photodetector?

Oh....the pulse is just done with an absolute amplitude going into an auto-
gain control, to give (usually) a bar-graph, sometimes a waveform, and
usually a 'beep' and a counter.  The AGC is needed due to the wide variance
in finger/earlobe thicknesses & so on.

Dave Hinz


--

Dave Hinz  -  Opinions expressed are mine, not my employer's.  Obviously.
Ask me if I have an opinion on this! \ Don't blame me; I voted for Perot!
SAAB - Because you get what you pay for.     \       Pherrets are Phun!!!
From: gerald.belton@ozonehole.com (Gerald Belton) 
Newsgroups: sci.electronics
Subject: Re: caller id block
Date: 21 Jan 93 15:48:00 GMT
Distribution: world
Organization: The Ozone Hole - SKYDIVE New Orleans! - (504)891-3142 16,800 bps
Reply-To: gerald.belton@ozonehole.com (Gerald Belton) 

>> Does anyone know if there is a place in the caller-id protocol for pbx
>> extension numbers?  For instance, the organization I work for uses 4 digit
>> extension numbers (soon to be 5 digit #s).  It seems like a serious flaw
>> if the pbx extension number cannot be passed on to caller-id.

>I believe that you don't receive the extension number.  You only receive the
>base number for the exchange.  I'm sure I don't have this entirely
>correct.

Here at Tulane we have a PBX system where each phone has its own number;
you dial directly to the phone on my desk.  A friend of mine has caller
ID, and the number that shows on his caller ID box is NOT the number you
would have to call to reach me.  In fact, it isn't the same number every
time I call.   He has tried calling the number that shows up on his
caller ID box, and it just rings with no answer.

---
 . SLMR 2.1 . Backup not found: (A)bort (R)etry (P)anic
                                                                                                        
----
+=====================================================================+
| The Ozone Hole - SKYDIVE New Orleans! - (504) 891-3142 HST/DS 16.8K |
| 3 Nodes <> USA Today <> Boardwatch Online <> 10 Gigs <> 73900 Files |
+=====================================================================+
From: tardif@gel.ulaval.ca (Pierre-Martin Tardif)
Newsgroups: sci.electronics
Subject: Software for heatsinks
Date: 22 Jan 93 14:56:53 GMT
Organization: Universite Laval

Hi !

	I am looking for a software that will calculate
the thermal resistance of an heatsink.  The heatsink is
custom made, the heat source is programable and can be put
 localy on the heatsink.

	Do you know of any FREEWARE/SHAREWARE/$$$WARE ??

	Thank you,
					PMT
--
Pierre-Martin Tardif, etudiant gradue  (email: tardif@gel.ulaval.ca)
Laboratoire de Vision et Systemes Numeriques
Universite Laval, Pavillon Adrien-Pouliot, local 00100-I, Ste-Foy, Quebec,
Canada, G1K 7P4         (418-656-2131, ext 4848)
From: ryoung@pollux.svale.hp.com (Roderick Young)
Date: Sat, 23 Jan 1993 01:58:23 GMT
Subject: Re: VCR Tuner Partially Inoperative!!
Organization: Hewlett Packard CPCD, Sunnyvale CA
Newsgroups: sci.electronics

re: some cable channels missing on new VCR

There are a number of different ways that the frequencies are allocated
for cable channels.  Very likely, there is a slide switch hidden behind
some door on your VCR, or some on-screen menu item to make the selection.
Try checking the owner's manual.
From: srgxnbs@grace.cri.nz
Newsgroups: sci.electronics
Subject: Z80/68** disassemblers wanted :)
Date: Thu, 21 Jan 93 20:45:43 GMT
Organization: Industrial Research Ltd., New Zealand.
NNTP-Posting-Host: grv.grace.cri.nz

It appears that a 6821 isn't a uP so I'm interested in Z80 and
68** and perhaps 65** disassemblers, preferably ftp-able
Bruce
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Newsgroups: sci.electronics
Subject: Re: 150 - 200 W. Amplifier
Date: 26 Jan 93 14:42:30 GMT
Organization: Northeastern Ohio Universities College of Medicine

I agree that, in general, an expensive HiFi system sounds better
than a cheap system.  Cost and exotic components, however, do not
necessarily have a causal relationship with pleasing sound
reproduciton.

The control/preamplifier in my stereo at home is a Fujitech A-102
which is a US import verison of a Luxman Luxkit by the now apparently
defunct Monarchy Engineering.  The kit was under $300.  Even
assembled, it shouldn't have cost more than $500 were it available
for sale as a finished product.  The A-102 uses good quality, but
definitely not exotic parts throughout and has very interesting
quasi-direct coupled FET gain stages design.  The gain stages are
similar to class A-AB, but use op-amp stabilized soruce degenration
(if you'll permit a bit of poetic license) with the opamps providing
a variable load.  I'm sure that tube type purists would sneer at
the relatively complex and convoluted design.  None the less:...  I
compared my finished A-102 against a much, much more expensive
SP-10 in a system with everything else maintained a constant as
possible.  The testers agreed that both pieces sounded very good
and there were some slight differences in the character of the
sound, but there was no general agreement about which was more
analytically correct.  There were no substantive differences in
so-called sound stage and other stereo buff type terminologies.

The biggest problem is that there is not very much high quality
source material available.  Most commercially available recordigns
are bad enough that they don't sound much better on a multi
kilobuck stereo than a cheap boombox.

The biggest problem I've seen in cheap sound equipment is woefully
lousy power supplies.  Plenty of improvement can be had without
resorting fancy polyproylene dielectric capacitors, but with
properly sized transformers and capacitors.  Active regulation does
wonders.


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: DC to AC on large scale???
Organization: Motorola Computer Group, Tempe, Az.
Date: Sat, 23 Jan 1993 15:03:50 GMT

In article <1993Jan21.095254.62979@cc.usu.edu> slmdj@cc.usu.edu writes:
>their power is distributed to a large substation is Direct Current!  He said
>that the DC is then 'phased' or 'converted' so that there is a three-phase AC 
>line to the city distribution grid.  Neither of us have any idea how this could
>be accomplished at such power levels (an entire valley, I think!)

How about a really big DC motor driving an equally giant alternator?



-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
From: dnelson@newssun.med.miami.edu (Dru Nelson)
Newsgroups: sci.electronics
Subject: Zenith TV Problem
Date: 27 Jan 93 19:37:24 GMT
Organization: University Of Miami, Medical School


  Hello,

     I just wanted to post this question to see if anybody with
     experience with Zenith TV's might have any hints.  I did buy
     the SAMS sheet for the set and I will do an in depth troubleshoot
     in a couple of weeks.  I am a student living in the dorm at
     Florida State.

     Zenith Model A1936P  - System 3 
     I got this set which started taking time to warm up.  Now it doesn't
     work at all.  It makes a loud buzzing noise and creates sparks from
     the ground "feelers" that touch the top right corner of the tube.  Those
     feelers connect via a wire to the PC board socketed to the back of the
     tube.  This wire/trace appears to be connected to the chassis, however
     this set DOESN'T have a chassis connection on the plug.   Could this
     be the shutdown circuit being active?  I don't leave the set on for
     long and it leaves an ozone kind of smell.  My only guess is that it
     is the high voltage/sweep module.

  As always, any help is greatly appreciated.


  Dru
From: drunen@nucleus.ps.uci.edu (Eric Van Drunen)
Subject: Source for 6811
Newsgroups: sci.electronics
Organization: University of California, Irvine
Date: 25 Jan 93 22:27:34 GMT

Anyone know a source for a 6811E2 where you don't need to buy 23?

Thanks in advance,
drunen@nucleus.ps.uci.edu


From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Sat, 23 Jan 1993 00:00:58 GMT
Subject: Re: T.V. and magnets, how to fix damage
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> >electromagnet with AC mains flowing through it.  This generates an
> >alternating magnetic field which demagnetises things around it. 
>                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Including floppy disks, hard disks, video/audio tapes if one isn't careful,
> no? :-)

Maybe.  I have intentionally left floppies, etc., around on top of 19"
monitors and power-cycled 'em, to see if this was a concern, and was unable
to damage the floppies.  The field created by the internal degauss coil is
relatively weak compared with, say, the hand-held degaussers - which I
wouldn't trust near ANYTHING with magentically-recorded info on it (have I
told you the story of a trip to Sony, and a hotel which had the new
magnetic-card locks??? :-)).  

This is NOT an endorsement of leaving your discs on top of your monitor -
I wouldn't trust 'em that far - but should you happen to do it accidently,
don't immediately assume that all is lost.


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   Systems Technology Div.  |those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
From: charles.berlinguette@outlan.ersys.edmonton.ab.ca (Charles Berlinguette) 
Newsgroups: sci.electronics
Subject: HELP
Date: 22 Jan 93 00:21:00 GMT
Reply-To: charles.berlinguette@outlan.ersys.edmonton.ab.ca (Charles Berlinguette) 
Distribution: world
Organization: Outland BBS  UUPCB  403-475-9588

I have a  K.E.M. Electronics ltd. Super EP-Rom Toaster, model KEM-901ASP
for pc-9801 or IBM XT/AT. I have no operating instructions and software
for my PC system and would like to know if someone might know of a
source for these items?
From: np4@prism.gatech.EDU (Nick Pomponio)
Newsgroups: sci.electronics
Subject: Re: RADAR, RADAR ECM, and RADAR ECCM
Date: 22 Jan 93 13:30:32 GMT
Organization: Georgia Institute of Technology

In <1993Jan21.182213.5156@wkuvx1.bitnet> scottcr@wkuvx1.bitnet writes:

}Question:

}Since the radar is Doppler based; wouldn't the ECM device have to be
}a transponder... with fast phase lock, sythesize pulses with the proper
}offset frequency to correspond with the desired readout speed, and
}transmit this with enough signal to prevent capture of the reflection?

}Hmmm...  
}-- 
}Chris Scott,  C/E Public Radio,  Western KY Univ,  (502) 745-3834
}SCOTTCR@WKUVX1.BITNET      fx off: 745-2084     fx hm: 781-1232  

The ECM device can be a simple repeater applying amplitude modulation to
the received signal. The AM frequency would be a function of the actual
velocity, the desired (deception) velocity, and radar signal wavelength.
Simple AM will produce two false velocity "targets"; the undesired one
could be supprssed by using a single sideband AM scheme.

-- 
POMPONIO,NICHOLAS A
Georgia Institute of Technology, Atlanta Georgia, 30332
uucp:	  ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!np4
Internet: np4@prism.gatech.edu
Newsgroups: sci.electronics