HDTenEightyP/NetNews huggingface dataset:
From: cstadbg@csv.warwick.ac.uk (Mr M J Brown)
Newsgroups: sci.electronics
Subject: Re: voice-suppression circuits,karaoke
Date: 31 Dec 92 12:55:38 GMT
Organization: Computing Services, University of Warwick, UK
NNTP-Posting-Host: lily.csv.warwick.ac.uk

In article <1992Dec23.000104.10686@news.acns.nwu.edu> yuen@casbah.acns.nwu.edu writes:
>Hi there,
>
>I am interested in finding plans,  kits or assembled pc to do lead vocal
>suppression on various source materials (tape, radio, CD etc). Can
>anyone help provide some hints or clues ?
>Am also interested in finding out how they work and quality 
>compared to a  karaoke machine (e.g. Pioneer) if somebody out there
>had built one before.
>I saw the ed in Radio electronics in May but this company already 
>disconnected their business phones. 

Vocal eliminators work by subtracting the left and right signals from each 
other. Usually outputting a mono signal, but I have seen one that ouputs a
mock stereo (mono to left and phase shifted mono to right!) signal. Sounds
a bit better than mono, but if recorded and played back on MONO equipment
all the music disappears....(remember, its out of phase with itself)

I will post an ASCII of a cirsuit I use, which is very good when used with
a CD/Tape source. CD is best, and it varies depending on how the original
CD/Tape/Record was mixed as to how well it works. It is only a simple circuit
(3 transistors and a dual opamp) but it works, and it also doesnt clobber
the bass signal (usually also in the centre) ... hence the opamp (a low pass
filter)

Keep watching .... when I get it ASCII'd i will post!

=============================================================================  
     _/      _/   _/   _/  _/   _/_/_/_/   |
    _/_/  _/_/   _/   _/_/     _/          |         Michael Brown
   _/  _/  _/   _/   _/       _/_/         |
  _/      _/   _/   _/_/     _/            |   cstadbg@csv.warwick.ac.uk
 _/      _/   _/   _/  _/   _/_/_/_/  _/   |     mjb@dcs.warwick.ac.uk
                                           |    csulo@csv.warwick.ac.uk
=============================================================================
Newsgroups: sci.electronics
From: ray@ole.cdac.com (Ray Berry)
Subject: word recog chip set sought
Organization: Cascade Design Automation, Bellevue, WA
Date: Wed, 30 Dec 1992 06:56:48 GMT

    I'm looking for a silicon chip/chip set, low end, to do isolated speaker-
dependant speech recognition.  About a yr ago I ran across a spec sheet for
such a beastie, & now I can't remember where I saw it (grrr).  If you can
help, please do.  Thanks.
-- 
Ray Berry kb7ht ray@ole.cdac.com 73407.3152@compuserve.com /*inquire within*/
From: ah335@cleveland.Freenet.Edu (Richard Banks)
Newsgroups: sci.electronics
Subject: What ever happened to sci.semi-conductors?
Date: 3 Jan 1993 17:41:38 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: ah335@cleveland.Freenet.Edu (Richard Banks)
NNTP-Posting-Host: slc4.ins.cwru.edu



A few weks ago there was talk of creating a sci.semi-conductors.
Did that group pass or fail?
Newsgroups: sci.electronics
From: Robert Jensen <jensen@aplcomm.jhuapl.edu>
Subject: Interface for 720K floppy drive w/ 34 pin connector?
X-Xxmessage-Id: <A76777719401940B@jensens-mac.jhuapl.edu>
X-Xxdate: Wed, 30 Dec 92 23:57:37 GMT
Organization: JHU/APL
X-Useragent: Nuntius v1.1.1d9
Date: Wed, 30 Dec 1992 20:55:20 GMT

I picked up an Epson disk drive for a 720K 3.5" floppy and would like to 
use it in a home project. I have no specs. I don't know what the drive
came 
out of. The drive has a connector with 34 pins in two rows. Does anyone 
know how to interface to this or any other drive with such a connector? I 
don't have much to lose by trying the wrong interface. I will risk the 
drive on the wrong pin-outs because it is of no use to me now. Does
anyone 
know where to look? I tried Epson, but they were no help. The drive is no 
longer in production. Any help is appreciated.
Xref: sparky sci.electronics:21325 sci.energy:6333 rec.autos.tech:17032
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics
Subject: Latching stuff with GALs
Date: 29 Dec 92 03:52:48 GMT
Distribution: usa
Organization: U of Wisconsin-Madison College of Engineering


Hi,

	I have a circuit in which I'd like a latch to maintain its value
when a state machine isn't in a certain state, and to acquire new data when
the state machine is in a certain state.  I would think that doing the
following would suffice:

	Out.d=Out&!In_Magic_State#Latch_Me&In_Magic_State

	This is in CUPL syntax, and In_Magic_State would expand to look
something like S2*!S1*!S0, meaning that it would be true in state 100.

	The problem is that this doesn't work.  The latched output goes
high for one clock cycle if Latch_Me is high, but then always dives back to
zero on the next clock cycle.

	So far I've tried added a #Out&In_Magic_State on the off chance
that there was a static hazard floating around, but this didn't help.

	I haven't yet tried this circuit at slow speeds, but I will
soon.  Even so, I'm using 25ns GALs with about a 500kHz clock -- not
exactly blindingly fast.

	What's strange is that if I actually go to the trouble to properly
design the above equation as a state machine (i.e., specify both outputs 0
and 1 as states and specify how you get from one to another), the thing
works.  The logic equation produced by this approach is different than the one 
above, but it's hard to tell exactly what the difference is since the GAL has 
inverted outputs and Demorgan's Theorem has been distributed over whatever 
final equation was used (in other words, the end equation looks little like the 
beginning equation).

	So... can someone tell me that the above equation really should
work, and that something else is getting screwed up somewhere?  Or better
yet... do you know which equation would work?  (And why?)

	Thanks...

						---Joel Kolstad
						kolstad@cae.wisc.edu
Xref: sparky sci.electronics:21439 sci.energy:6387 rec.autos.tech:17090
From: laird@stable.ecn.purdue.edu (Kyler Laird)
Subject: Re: Looking for Paralell extender
Organization: Purdue University Engineering Computer Network
Date: 30 Dec 92 15:37:50 GMT

Dan <DANW@WUVMD> writes:

>I am looking for a device that will extend a parallel printer port
>over a 4 wire connection.  Basically a parallel modem.
>Any information on where I might obtain one would be appreciated.

Basically a parallel->serial->parallel system.  Black Box should be
able to set you up with two appropriate boxes.  (I think they have
at least one that works over a twisted pair.)  Your max. transfer
rate should drop (significantly) using these devices - it's time
consuming to serialize 8 bits (+control signals).

Also, consider using Black Box Hyper cable for long parallel runs,
or using a parallel->serial converter and a serial device (many
printers have both parallel and serial connections - no need to buy
an external converter if you have one built in).

--kyler
From: pauls@trsvax.tandy.com
Date: 29 Dec 92 10:27 CST
Newsgroups: sci.electronics
Subject: Re: LA5658 Info needed on an IC from a 
Message-ID: <288200049@trsvax>
Nf-ID: #R:Princeton.EDU:1711:trsvax:288200049:000:600
Nf-From: trsvax.tandy.com!pauls    Dec 29 10:27:00 1992


It's from Sanyo...

"MultiFunction Multiple Voltage Regulator" on page 597 of 1988 data book.

Basically, has 3 Vins and 3 Vouts as follows:

Pin 1 Vin for +15VDC Vout
Pin 2 Vin for +5VDC Vout
Pin 3 Vout +5.0
Pin 4 Ground for +5.0
Pin 5 hang a cap off here for uP reset pulse width
Pin 6 RESET out to uP (ie power-on reset)
Pin 7 Vin for +30VDC out
Pin 8 Vout +30VDC
Pin 9 current limit resistor for Vout +15. Resistor goes between pin 1 and
9.

Pin 10 Vout +15
Pin 11 NC
Pin 12 Ground

Ratings are:

+5VDC  and +30VDC set by resistor as Iout = 0.35/R Amps
+15VDC set at 500ma Max

Hope this helps!


Newsgroups: sci.electronics
From: snydert@dmapub.dma.org (Tony Snyder)
Subject: Need source for large (>30,000 uF) caps.
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]
Distribution: na
Date: Fri, 25 Dec 1992 02:37:07 GMT

OK, now what voltage are we talking about?
Newsgroups: sci.electronics
From: hcb@netcom.com (H. C. Bowman)
Subject: Practical circuit help...
Keywords: decoupling
Organization: Box of Rain Productions
Date: Tue, 22 Dec 1992 14:43:48 GMT


Hullo--

A practical circuit question: I've got a circuit that looks vaguely like
the following, and I wonder whether I need some additional decoupling on the
power supply line.  




  ------                              -----------                     --------
 |      |      14 Feet 20 ga         | TTL Logic |   6 Feet Ribbon   | 40 KHz |
 | 7805 |----------------------------|  Control  |-------------------| 400 mA |
 |      |                            |  Circuit  |                   | 10% on |
  ------                              -----------                      -------

My TTL components have .001 uF filter caps for high-frequencies, and
every-other one has a .1 uF cap for decoupling.  What I'm wondering is whether 
I need to compensate for the 400 mA current pulses, and if so, how?  If I hang
a gi-hugeous electrolytic on my TTL board, what do I do about current inrush?

I've not yet built this thing, so I don't have anything empirical to go by.
Manufacturing concerns dictate that any decoupling be done on the TTL board.

Many thanks!

--Cliff

-- 
| Cliff Bowman     |(501) 968-2232 Voice | As of 1 December, 1992, I was |
| Electronics Wonk |(501) 964-6118 Pager | approximately $1,017,077 shy  |
| Innovation Ind.  |(501) 968-7986 Fax   | of being a millionare.        |
Xref: sparky sci.electronics:21546 sci.energy:6443 rec.autos:30488
From: jimf@centerline.com (Jim Frost)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 24 Dec 92 16:02:21 GMT
Organization: CenterLine Software, Inc.
NNTP-Posting-Host: 140.239.3.202

wb8foz@skybridge.SCL.CWRU.Edu (David Lesher) writes:
>Others said:
># It doesn't sound like you have been listening either.  In the event of
># a catastrophic failure, gasoline burns, it does not explode.  The energy
># contained in the tank is released over a period of 15 to 20 minutes.
># 
># The flywheel will try to dissipate it is energy over a span of milliseconds.

>Try telling the three people who burned to death in the tanker/
>multi-car crash at the I 270/Beltway intersection that it is ok that
>gasoline burns over 15-20 minutes. That may be true, but they are still
>dead, regardless of how long their remains cooked.

True, but that resulted in localized damage.  Expend all of that
energy at once and you'll hurt more than just the people involved in
the crash.

jim frost
jimf@centerline.com
Xref: sparky sci.electronics:21645 sci.energy:6463 rec.autos:30597
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 28 Dec 1992 19:53:24 GMT
Organization: HST Wide Field/Planetary Camera
Distribution: world
Reply-To: carl@SOL1.GPS.CALTECH.EDU
NNTP-Posting-Host: sol1.gps.caltech.edu

In article <1992Dec21.193621.12001@microware.com>, troyf@microware.com (Troy Frericks) writes:
>>If I were a terrorist, I would drool at the thought of being able to
>>get such wonderful bombs so easily... All you'd have to do is arrange
>>for the vacuum valve to be opened on command or the magnetic bearing
>>to be turned off, etc.
>>
>>BOOM!
>
>Modern composit materials, when used in a flywheel, will disintegrate
>with such a failuar.  This bomb would be about as wonderful as some
>fiber-glass insulation falling out of your attic.

Oh?  And where do *YOU* think that all the kinetic energy goes?  The flywheel
fairy sneaks in and takes it?

Boy, the propaganda about "it's fluffy, so it's harmless" seems to be *REALLY*
effective.
--------------------------------------------------------------------------------
Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL

Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.  My
understanding of astronomy is purely at the amateur level (or below).  So
unless what I'm saying is directly related to VAX/VMS, don't hold me or my
organization responsible for it.  If it IS related to VAX/VMS, you can try to
hold me responsible for it, but my organization had nothing to do with it.
From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Substituting fsuppli
Date: 28 Dec 92 17:04:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 Im making a small device to produce in small amounts and found a deal
for 12v 200ma dc adapters at only 95 cents a piece from parts express.
Its rated at 200 ma which is more than my circuit needs. My only problem
is that its replacing a 17vdc and a 7812 regulater chip which provides
quite a stable 12 volts. Im also using a 470uF capacitor for filtering.
Are DC adapters pretty regulated on their own. If I dont exceed the 
amperage can I be sure that the output voltage will notmuch below
12 volts even if I continue to use the filter capacitor. I would appreciate
any help. This would save me over $1  $10 iich could add up.ld add up.



      Neil Gandler
From: rmf@bpdsun1.uucp (Rob Finley)
Newsgroups: sci.electronics
Subject: Re: Origin of 'BNC'
Keywords: BNC CONNECTORS HISTORY QUESTION
Date: 30 Dec 92 23:38:24 GMT
Organization: Harris Allied Broadcast Div., Quincy, IL

Here is a posting from years ago:


****


The origin of the `BNC' acronym *ought* to be an FAQ -- it gets asked
frequently enough.

It's Bayonet Neill-Concelman, after the two engineers that designed
it.

`TNC', by the way, is Threaded Neill-Concelman.

The idea that it's `Berkeley Nucleonics Corporation' is an urban legend.


 
Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: Best way to program 68hc705 series
Organization: SSC, Inc.,  Seattle, WA
Date: Sat, 26 Dec 1992 20:22:59 GMT
X-Newsreader: TIN [version 1.1 PL6]

 (DI3QC@CUNYVM.BITNET) wrote:
:      I am planning to do some work using motorola's 705 series probably somethi
: 
: ng like the 705c9,d9 or t3. My question to anyone out there that has worked
: with this series is what is the best way to program these. Are there any ways
: to program these that dont require a programmer board and an eprom with a
: copy of the code. I would like to just have a serial programmer do the work
: from a pc. I dont want to spend any big bucks. Any suggestions or info on
: programming these controllers would be great. Thanks

Most of the newer '05s have multiple programming modes, one of which
is to load the eprom right from the serial port, so no intermediate
copy is necessary.

For an example see the April/May 1992 Circuit Cellar INK.  Or get
the datasheet.

As for finding out about 'hc05s, get the latest copy of the
Master Selection Guide from your local sales rep/office or
in North America call the literature dept. at 800-441-2447.  

They have dropped their 8 bit Micro databook, (last published 
in 1988), and are going with individual datasheets now.

Mark Zenier  markz@ssc.wa.com
From: wb8foz@skybridge.SCL.CWRU.Edu (David Lesher)
Newsgroups: sci.electronics
Subject: Frequency Independent ballasts & power supplies
Date: 27 Dec 1992 14:29:00 GMT
Organization: NRK Clinic for habitual NetNews abusers - Beltway Annex
Reply-To: wb8foz@skybridge.scl.cwru.edu (David Lesher)
NNTP-Posting-Host: skybridge.scl.cwru.edu

I'm wondering about large (100's of watts) discharge lamps that have
electronic ballasts. My purpose is to run such from 400hz power
sources. I've got a call in to GE Nela Park, but thought I'd ask here,
too, if only to give Phillips a chance :-}

Secondly, I'm looking for net-speculation regarding running switcher
supplies on the same stuff. It should be no problem once you have DC to
switch, but ISTM that the incoming line meets a big inductor, and at 6x
its normal freq, not a lot would pass.

And to round things off, how about wall-warts? I've used normal-sized
60 hz transformers on 400 hz, & can't think of any reason why they
would object, but it never hurts to speculate..
--
A host is a host from coast to coast..wb8foz@skybridge.scl.cwru.edu
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
Xref: sparky sci.electronics:21473 sci.energy:6409 rec.autos:30408
From: geoyunk@sys6626.bison.mb.ca (George Yunk)
Newsgroups: sci.electronics
Subject: Re: VCR Repair
Date: Thu, 31 Dec 92 15:18:28 CST
Organization: System 6626 BBS, Winnipeg Manitoba Canada

adkins@singha.eng.ohio-state.edu (Kenneth C. Adkins) writes:

> To the person who requested books on VCR Repair.  I recently checked
> out two books from the area library on VCR Repair:
> 
> 	"Complete Guide to Videocassette Recorder Operation
> 	 and Servicing," John D. Lenk, Prentice-Hall, 1983.
> 
> 	"Home VCR Repair Illustrated," Richard C. Wilkins and
> 	Cheryl A. Hubbard, TAB Books, 1991.
 
Thanks Kenneth... I'll see if they have them at my local library.
 
                                            George

Newsgroups: sci.electronics
From: mike@vpnet.chi.il.us (michael kamlet)
Subject: Ultrasonic transmitter/receiver
Reply-To: mike@vpnet.chi.il.us
Organization: Vpnet Public Access
Distribution: na
Date: Sun, 27 Dec 1992 20:27:03 GMT

I was looking around the other day and came across some parts listed as an
ultrasonic transmitter/receiver.

The numbers on them are as follows:

R40-24A
83.20

and
T40-24A
83.25

Can anyone tell me what these are -- what can they do ???

Thanks

Mike Kamlet
mike@vpnet.chi.il.us


Xref: sparky sci.electronics:21525 sci.energy:6433 rec.autos:30468
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 24 Dec 92 03:27:10 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <1hb3nkINNmgv@usenet.INS.CWRU.Edu> wb8foz@skybridge.SCL.CWRU.Edu (David Lesher) writes:

|Others said:
|# It doesn't sound like you have been listening either.  In the event of
|# a catastrophic failure, gasoline burns, it does not explode.  The energy
|# contained in the tank is released over a period of 15 to 20 minutes.
|# 
|# The flywheel will try to dissipate it is energy over a span of milliseconds.

|Errr,
|Try telling the three people who burned to death in the tanker/
|multi-car crash at the I 270/Beltway intersection that it is ok that
|gasoline burns over 15-20 minutes. That may be true, but they are still
|dead, regardless of how long their remains cooked.

Errr, yourself.  Every year how many people get out of their cars before
they start to burn, or before the flames get to intense.  I don't know
myself, but it is probably hundreds if not thousands.  Way, way more than
the number who burn to death.

In a flywheel crash, they have only milliseconds to get out of the car.
How many do you think will make it.

-- 
Mob rule doesn't become any prettier, just because the mob start to call itself
a government.
It ain't charity if you are using someone else's money.
Mark.Wilson@AtlantaGA.NCR.com
From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Tue, 22 Dec 1992 21:43:08 GMT
Subject: Re: Very sharp RF notch filter sought
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics

jgd@dixie.com (John De Armond) writes:

(with regard to using a stub as a notch filter:)

>Depends on the Q of the transmission line.  If very high quality coax,
>hardline or even better, air hardline is used for the stub, it will be 
>quite narrow.  My worry would be in making it too narrow for the 
>fairly wideband FM signal.  For 2-way work, where the bandwidth is
>much less, a piece of 1" CATV coax works just fine to notch out offending
>intereference.


Also depends on impedance levels.  The depth of notch will depend
on the Q (e.g., on the stub resistance at resonance, compared with
the impedance of the line the notch is being put in.  But off the
notch frequency, the attenuation will depend more on the impedances
of the lines involved.  A moderate Q or a high Q stub of the same
impedance line will each have nearly identical impedances 10% off
resonance, but will have far different impedances at resonance.

Also, most of the line loss in the stub at these frequencies will
be copper resistance loss, not dielectric, so it's much more the
diameter and length of the coax and the construction of the conductors
than the dielectric, assuming polyethelene or Teflon or air (or vacuum
;-) dielectric, that's important in optimizing Q.  Interestingly,
polyethelene dielectric will cause the inner conductor to be smaller
than air dielectric for a given impedance and outer conductor
diameter, thus raising the loss, _but_ the length needed for 1/4
wave at a given frequency will be less, so there will be less loss.
It's left as an exercise for the reader to figure out which factor
dominates.  (Hint:  does it vary with impedance?  With frequency?)
Xref: sparky sci.electronics:21776 sci.energy:6519 rec.autos:30786
From: gary@ke4zv.uucp (Gary Coffman)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flyin' Flywheels
Date: 31 Dec 92 01:24:46 GMT
Reply-To: gary@ke4zv.UUCP (Gary Coffman)
Organization: Destructive Testing Systems

In article <1992Dec26.083859.15101@klic.rain.com> keithl@klic.rain.com (Keith Lofstrom) writes:
>
>Well, guys'n'gals, thanks for the fun.  Engineering is the process of
>tearing things apart in our minds.  Those things we can't tear apart
>in our minds we have to go ahead and build.  Too much work.  Flywheel
>powered cars are so beguiling that it takes a good bit of effort to tear
>the concept apart, but it can be done.  If you feel more like defending
>ideas than trashing them, you have the wrong temperment for engineering.
>Try management or sales.

Truer words were never spoken.

Gary

-- 
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | uunet!rsiatl!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | emory!kd4nc!ke4zv!gary      
Lawrenceville, GA 30244     |                     | emory!ke4zv!gary@gatech.edu
Newsgroups: sci.electronics
From: barr@tramp.Colorado.EDU (BARR DOUG)
Subject: Charging a battery
Organization: University of Colorado, Boulder
Date: Tue, 22 Dec 1992 19:04:16 GMT

I notice when charging my car battery that the amps goes up to about
5 when battery is dead and gradually goes down to nothing as the battery
is charged. How does a battery charger sense this? The internal resistance
of the battery? (but no, becuase that goes down as the charge goes up,
doesn't it?). What sort of sensing circuit is used to reduce the amperage?
Anyone know?

Xref: sparky sci.electronics:21663 sci.energy:6482 rec.autos:30632
From: stead@skadi.CSS.GOV (Richard Stead)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 29 Dec 92 01:14:10 GMT
Followup-To: sci.energy

In article <72307@cup.portal.com>, Ted_Eugene_Viens@cup.portal.com writes:
> If I took a megajoules worth of Gasoline vapor
[...]
> Then let us place about a kilogram of graphite directly between them.  Now let 
> us discharge, as quickly as power source resistance will let us, a megajoule of
> energy through the graphite.  This is where we will part in our agreement.  My
> thoughts are that a person standing next to the housing would here a very (very
> ,
> very) loud bang.  If they turned to look at the housing, they would see it
[...]
> Again, I am sure we might disagree somewhere....

No disagreement.  Energy is conserved.  A megajoule of gasoline is about a
teaspoon.  Makes a big bang if perfectly mixed with air, but not
overwhelmingly big.  A graphite heater discharging a megajoule will
also do interesting things, but unless it is very small (in which case
it will be difficult to pump a magejoule through), it will not vaporize -
since a megajoule can only vaporize 20 grams of graphite.

However, we are talking about 400 megajoules in the flywheel.


--
Richard Stead
Center for Seismic Studies
Arlington, VA
stead@seismo.css.gov
Newsgroups: sci.electronics