HDTenEightyP/NetNews huggingface dataset:
From: till@acid-rain.lucid.com (Don Tillman)
Subject: Electric Guitar Pickups?
Reply-To: till@lucid.com
Organization: Lucid, Inc.
	<92350.133406WAUGH@SLACVM.SLAC.STANFORD.EDU>
Date: 16 Dec 92 00:44:17

   Date: Mon, 14 Dec 1992 19:13:08 GMT
   From: jrusmise@ee.ubc.ca (RUSMISEL JASON DIRK)
   Organization: University of BC, Electrical Engineering

   I was wondering if anyone could explain just how the pickups in 
   an electric guitar work?  I understand the electromagnetic theory 
   behind them. 

A pickup consists of one or more magnets and one or more coils of wire.
The steel guitar strings vibrate, wiggling the magnetic field, and
Faraday's law tells us the change in magnetic field induces a voltage on
the coil.  

   I'm looking for practical information on the sort of voltages
   that amplifiers expect to see, impedance of a guitar, what are 
   active pickups, how are the pickups oriented?

Guitars typically put out up to a few volts peak to peak, if you're really
whacking at the strings.  The impedance of a pickup varies greatly with
frequency, but you should load it down minimally (> 1 Mohm) if you want it
to sound good.  Active pickups have a preamp built in so you don't have to
worry about loading them down.  Pickups are generally oriented with the
coil axis perpendicular to the strings, although there's one exception (the
Gibson Firebird pickups).

   Date: 15 Dec 92 20:22:56 GMT
   From: jhalvers@plains (Jon Halverson)
   Organization: North Dakota Higher Education Computing Network

   Well as far as I know, Most high imp. humbuckers max at about a volt or
   so, less for singles. You can check by puting a V/ohm meter set to read AC
   votltage across it and strum real hard. 

This method isn't very good.  A passive VOM will not work on small signals
and even active VOMs generally don't work over the audio band.  Best to
just use a 'scope.
					   
   Date: Tuesday, 15 Dec 1992 13:34:06 PST
   From: <WAUGH@SLACVM.SLAC.STANFORD.EDU>
   Organization: Stanford Linear Accelerator Center

   How do today's active (low impedence) pickups compare with those low
   impedence jobs seen on old "recording" guitars put out by Gibson and
   others.  The L-5S and the Les Paul both came in low impedence versions.  
   These generally have lower market value than their humbucking counterparts.
   Might these oldies be fitted with an internal pre-amp and be used with
   regular amps? 

Right, the Gibson low impedance pickups were too clean sounding for rock'n
rollers, although there are exceptions (Terry Kath of CTA and the bassist
with Harry Chapin's band).  Actually those Gibson instruments with low
impedance pickups had transformers built in, so they could be used just
fine with regular amps.

  -- Don


Xref: sparky sci.electronics:20560 rec.audio:16583
From: rmf@bpdsun1.uucp (Rob Finley)
Newsgroups: sci.electronics,rec.audio
Subject: (Audio Amateur) Mortensen DC300B Tube/MOSFET amp question.
Date: 11 Dec 92 14:19:00 GMT
Organization: Harris Allied Broadcast Div., Quincy, IL


Greetings:  
   I am poised to assemble a pair of the Mortensen amp channels and
was wondering if anyone has driven 4ohm loads with it?


It would be dreadful if it couldn't.


Anyway, the output is driven by a pair of Hitachi 2SJ50's 
and a pair of 2SK135's


Robert

-----
"We know what the reponse of the American people will be, and it's not
attractive.  They really do believe the Bill of Rights gave them unleaded
regular for $1.06 a gallon, and they better get it or, by God, they'll get
the bums out of Office."  -- Energy Secretary James Watkins on taxing energy.

quintro!bpdsun1!rmf@lll-winken.llnl.gov or uunet!tiamat!quintro!bpdsun1!rmf
Newsgroups: sci.electronics
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: Voltage regulators in parallel?
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Fri, 18 Dec 1992 12:59:10 GMT
X-Newsreader: TIN [version 1.1 PL6]

You should be able to regulate a pass transistor with the regulator.
You then can parallel pass transistors if really high currewnt is needed.

Xref: sparky sci.electronics:20892 sci.energy:6167 rec.autos.tech:16770
From: mwilson@ncratl.AtlantaGA.NCR.COM (Mark Wilson)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 20 Dec 92 19:31:35 GMT
Organization: NCR Engineering and Manufacturing Atlanta -- Atlanta, GA

In <72023@cup.portal.com> Ted_Eugene_Viens@cup.portal.com writes:

|I am looking forward to being one of the first people in the
|world to get a deal on an early model Flywheel powered Electric Used car (Its
|my style.)
|   It all seems possible to me...  Ted..

Fine, just don't crash it anywhere near me, I want to live to see my
grandchildren.

-- 
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
Xref: sparky sci.electronics:21237 sci.energy:6295 rec.autos.tech:16974
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 20 Dec 1992 23:08:31 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 <71918@cup.portal.com>, Ted_Eugene_Viens@cup.portal.com writes:
>All safeguards have been defeated.  The rotor is locked in an unlimited charge
>mode.  The charging current brings the rotor speed far above any design
>limits or safety margins.  Suddenly, there is catastrophic failure.  What
>can we expect to happen?  Conservation of energy tells us that all of the 
>energy in the flywheel is going to go somewhere very fast.
>   What kind of energy will it be?  At the moment of failure, it will all be
>kinetic energy.  The rotor is composed of three basic parts:  the composite
>flywheel, the steel axle shaft, and the copper coils used to transfer energy
>into and out of the flywheel.  The axle shaft and hardware to mount the
>composite flywheel will be symetrical and strong enough to stay fairly centered
>and dispell its engery by frying the cases of the now failed magnetic bearings
>over a relatively long period of time (several seconds to many minutes.)

Sorry, but you apparently missed a post early in this thread where the
designers of one of these flywheels were quoted as saying that in a
catastrophic failure, the flywheel WOULD disintegrate.  They described the
flywheel after disintegration as "fluff."  This bit of disingenuousness was
apparently meant to make the flywheel seem safe.  After all, "fluff" couldn't
possibly be dangerous, could it?

[Further speculations based on ignorance of the designs in question deleted]
--------------------------------------------------------------------------------
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.
Newsgroups: sci.electronics
From: jon_sree@world.std.com (Jon Sreekanth)
Subject: Re: Handling CMOS
Organization: The World
	<1992Dec11.211003.22990@pts1.pts.mot.com>
	<1992Dec14.120707.13760@eng.cam.ac.uk>
Date: Sun, 20 Dec 1992 03:48:51 GMT

In article <1992Dec14.120707.13760@eng.cam.ac.uk> cmh@eng.cam.ac.uk (C.M. Hicks) writes:


   >>The way I install CMOS chips is in the bathroom.  Take the circuit board, all
   >>the tools you might need and the chips into the b-room and close the door.
   >>Run the shower on HOT for a few minutes, until the mirror fogs over.  Leave the
   >>water running (maybe turn it down a little), touch the board and the package the

...
   board simultaneously while handling the chip. All this bathroom stuff seems
   bizarre - do you get contact corrosion because of water trapped in the
   sockets :-? BTW, conductive foam is much more usable than foil.
...

Why not just buy a $50 humidifier from the nearest department store ?
Working in the bathroom with the water running seems a bit much.

/ Jon Sreekanth

Assabet Valley Microsystems, Inc.           |  Fax and PC products
5 Walden St #3, Cambridge, MA 02140         |  (617) 876-8019
jon_sree@world.std.com                      |
From: v064mb9k@ubvmsd.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Flywheel batteries as EV power source
Date: 13 Dec 92 05:42:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


 I just have finished reading the latest Popular Science issue. Jan 93.
On p. 27 they discuss flywheel power as a possible energy source for 
future Ev's. Claimed advantges are a cruising rnage of over 600 miles
on an overnight charge on GM's Impact. With a battery weight of only
600 pounds and a life of 25,000 miles and with no chemical waste when
disposed this new power source could revolutionise the
EV industry. Why is this technology not being looked into more. What
are the dissadvantages. What is this technology exactly. How is
mechanical energy stored in such great amounts. Also the IEEE spectrum
also touched slightly on this topic I believe in their assesment on
EV development. 

		Neil Gandler
Newsgroups: sci.electronics,alt.cyberpunk
From: lruppert@rodan.acs.syr.edu (Dahr--The Beastmaster)
Subject: Re: Caller ID block?
Organization: Syracuse University, Syracuse, NY
Date: Tue, 15 Dec 92 15:21:15 EST

In article <1992Dec14.013239.1@acad3.alaska.edu> nsmca@acad3.alaska.edu writes:
>In article <1g2lufINN842@hp-col.col.hp.com>, mdk@col.hp.com (Mark Keisling) writes:
>
>Can't you instead of blocking have the number be reported as something other
>than the number you are calling from, like the old blue/black box ttrick

I was thinking of something just along those lines the other day.  All you'd 
have to do is send a short signal to block/jam the legit one sent by the phone
company, and then send yours afterwards, if the the whole transaction only takes
a few tenths of a second, you'd still have time to spoof a signal between rings.
You could change the date and time or your number.  Somehow I love the idea of 
people calling me back and reaching the White House :>.  Since your phone can
transmit to the other line before the phone is picked up, it should be quite 
easy to implement this.  Just have your machine send the jam & spoof every time
you dial.  just press a key before you dial the last number in the number you're
trying to reach.  Then once the jammer hears that you've dialed a number on the
phone keypad, it would jam for enough time to cancel the legit signal, and then 
transmit the number/combo of your choice.  Anyone in a caller id zone wanna try
it?

>Ghost Wheel

Louis Ruppert
lruppert@mailbox.syr.edu
From: stlucas@gdwest.gd.com (Joseph St. Lucas)
Newsgroups: sci.electronics
Subject: IC ident needed
Date: 14 Dec 92 21:36:01 GMT
Distribution: usa
Organization: General Dynamics Corp.

The last time I sent this out, it got stuck in our local CA. loop.

Okay, I'll try again.  I have a Sequential Circuits model 270 , 2 1/2 
octive keyboard for hooking up to the joystick port of my commodore 64.
The kids have torn the wiring out of the side, the wiring consisting of
five lines.  This wiring was torn out of the board such that no color
exists on the solder glob to make identification for me easy.
 Sequential has been bought out by Wine Country Productions,
whom I've written months ago for assistance on how to rehook the wiring
back up.  All I've received from them to date are two ads for new midi
interfaces, so I know they at least got my letter. (and then ignored it
after I was put on their mailing list.)
This last weekend I took the keyboard apart, and inside was a 40-pin
IC, a resistor, and a capacitor(?).  FOr the folks in the electronics
group, the chip had the following marking on it.
I-600
5A-2084
8438

The IC had 32 lines connected to the keyboard keys.  Of the five lines,
one was connected to pins 1 and 2, one to pin 20, one to pin 3, one to
pin 39, and one to pin 38 through a 915 ohm resistor.  There is something
connected across pins 1 and 20 that could be a small cap, but the only
markings on it are 104m.

I assume pins 1 and 20 are ground and +5 volt, but I'd hate to guess 
wrong and burn out the chip.  The other three lines are joystick data
lines, and I could vary the connections with them until they work 
provided I have the power hooked up right.

For the c64 folks, the three data lines are A0, A2, and A3.

If anyone knows the proper power connections for this IC, please let me
know.  If anyone knows how to hook the final three lines up correctly,
please save me the experimentation time.
Thank you.
-- 
Joe St.Lucas    stlucas@gdwest.gd.com        Standard Disclaimers Apply
General Dynamics Space Systems, San Diego
My blood runs Husker red.
From: pauls@trsvax.tandy.com
Date: 11 Dec 92 10:30 CST
Newsgroups: sci.electronics
Subject: Re: producing a consumer electronic
Message-ID: <288200045@trsvax>
Nf-ID: #R:tc.fluke.COM:7549:trsvax:288200045:000:37
Nf-From: trsvax.tandy.com!pauls    Dec 11 10:30:00 1992


Or tell me!

pauls@trsvax.tandy.com
From: dmason@hepex1.uoregon.edu (David Mason)
Newsgroups: sci.electronics
Subject: Needed: Names of Companies making PC Boards
Date: 15 Dec 92 22:48:04 GMT
Article-I.D.: pith.1glnb4INNt1
Distribution: world
Organization: University of Oregon Network Services
NNTP-Posting-Host: hepex1.uoregon.edu


	The group I work for needs to have some detailed PC boards (gold-plated
pads, sizes about 1 mil or so, with a board about 2" x 6") made, and I was wondering
if anybody out there can recommend a company (or companies) that does this.  I have
talked to one company, but they have problems making pads and traces any smaller
than 5-8 mils.  Any help would be greatly appreciated!

Thanks...
David Mason
Xref: sparky sci.electronics:21065 misc.consumers:20863
From: louis@aupair.cs.athabascau.ca (Louis Schmittroth)
Newsgroups: sci.electronics,misc.consumers
Subject: Re: DOES AMERICA SAY YES TO JAPAN? - Off track!!
Date: 18 Dec 92 02:00:37 GMT
Followup-To: sci.electronics

strnlght@netcom.com (David Sternlight) writes:


|If I were the policy maker I'd also file a major damage suit
|against Japan under GATT, along the lines of the suit we filed
|against the Europeans in the crop case recently in the news. We
|won three out of three adjudications in that case.

|David

I second this motion.  It would really shake them up, as it did the
Europeans.  However, notice that the US Dept of Agriculture is behind 
the mover against the farm subsidies in Europe.  There is not American
government entity with the kind of clout in electronics that the Dept 
of Agriculture has in farming.
--
Louis Schmittroth louis@cs.athabascau.ca
NW 1/4 18 67 21 W4 Alberta.  
Newsgroups: sci.electronics
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Subject: Re: Making decals on plastic
Organization: AI Programs, University of Georgia, Athens
Date: Mon, 14 Dec 1992 05:45:37 GMT

Not to mention Avery _clear_ laser printer labels, available at your
nearest office supply shop!

-- 
:-  Michael A. Covington     internet mcovingt@uga.cc.uga.edu :   Verbum caro
:-  Artificial Intelligence Programs       phone 706 542-0358 :    factum est
:-  The University of Georgia                fax 706 542-0349 :  et habitavit
:-  Athens, Georgia 30602-7415 U.S.A.     amateur radio N4TMI :   in nobis...
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: Re: Best nicads??
Keywords: nicad
Date: 12 Dec 92 20:06:50 GMT
Organization: University of Pennsylvania, Mechanical Engineering


:
:Are you sure the Radio Shack endorsement didn't just apply to their alkaline
:cells? The Radio Shack D nicads are =AA= cells in D cases!
:

radio shack has regular and high capacity rechargables. The specifications
for the regular D are exactly the same as for the C, but higher than AA.
The 'high capacity' rechargables would seem to fill the whole 
volume of the case in each size..

--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
Xref: sparky sci.electronics:20919 sci.energy:6174 rec.autos.tech:16788
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 17 Dec 1992 04:18:45 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 <1992Dec17.035214.15058@u.washington.edu>, basiji@stein.u.washington.edu (David Basiji) writes:
=>Unless you wrap the flywheel in a massive enough container that it can absorb
=>all that energy without vaporizing, you're going to have an explosion.
=
=I would design a housing of Kevlar or Spectra woven around a thin lead
=alloy lining. The lead would prevent small particles from penetrating the
=weave by distributing the force over an area larger than the mean cell
=size of the fabric.  The weave would contain any larger particles so that
=the energy would be dissipated within the housing by all the mechanisms
=mentioned before, as well as a considerable portion from particulate
=collisions within the housing.  The housing would be relatively light
=and could be formed into fairly complex shapes. Cost would not be prohibitive
=, probably on the order of $300, with economies of scale.

You're saying, then, that you couldn't melt that container with a blowtorch and
on the order of a gallon of gasoline?  And that you STILL couldn't melt it if
you managed to apply all that heat in the course of a fraction of a second? 
Sounds like pretty impressive stuff to me.
--------------------------------------------------------------------------------
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: mikc@hal.gnu.ai.mit.edu (Mike Coughlin)
Newsgroups: sci.electronics
Subject: Shunshine PAL burner
Date: 12 Dec 1992 18:05:49 GMT
Organization: MIT Artificial Intelligence Lab
Distribution: na
NNTP-Posting-Host: hal.gnu.ai.mit.edu
Summary: Source for software upgrades needed

   I have access to a Shunsine PAW-401 PAL programmer. This is an
inexpensive PAL burner that was sold thru retail oriented mail order
computer parts dealers. I would like to be able to use it on new
model PAL' but I only have V 2.2 of the software and don't know 
where to get upgrades. Does anybody know the address or phone
number of the company that makes (made?) it? Is there any PD
software that I can get from the net that will work with it?
Is there another inexpensive PAL burner available that can use
generic software that will be updated for the forseeable future?
Are there free versions of the programs needed to deal with the
compiling and fuse blowing chores of PAL's GAL's etc., or is
such software propriatory and tied to specific hardware?

-- 
   Michael Coughlin             mikc@gnu.ai.mit.edu
From: kevins@hpspdla.spd.HP.COM (Kevin G Smith)
Newsgroups: sci.electronics
Subject: Electronic Guitar Tuner Hacking?
Date: 11 Dec 92 17:57:22 GMT
Organization: HP Stanford Park - Palo Alto, CA

Does anyone on the net know of any references in the amateur electronics
or music magazines to tweaking electronic guitar tuners to
change their frequency response especially for non-standard
musical instruments?  I am not a guitar player but I understand that
some of the popular electronic guitar tuners (e.g. Korg) can be "hacked" on 
for tuning instruments that do not use the traditional Western
(chromatic) scale such as the Highland Bagpipes.  I am tuning a practise
chanter now by ear and by comparison to other pipers but an electronic
tuner would be a great convenience and hopefully more objective.
Plus I don't want to spend the money for anyone else's fancy tuner ;)

*******************************************
* Kevin G. Smith                          *
* Email: kevins@hpspd.hp.com              *
*******************************************
Newsgroups: sci.electronics
From: pngai@adobe.com (Phil Ngai)
Subject: Re: Pseudo-static RAMS: SUMMARY
Organization: Adobe Systems Incorporated
Date: Tue, 15 Dec 1992 20:06:08 GMT

In article <1992Dec15.023603.27256@cc.gatech.edu> byron@cc.gatech.edu (Byron A Jeff) writes:
>>> [Byron]
>>  [John West]
>[Byron's additional comments, questions, and suggestions]
>>Random access cycles tend to be fairly slow. (I've got data on Hitachi's
>>HM658512 512K*8 PSRAM. Random access for the -8 part is 160ns. For addresses
>>within the same column (high 8 address bits the same), the access time is 80ns.
>AHA! I knew that there wasn't something for nothing. The part number you
>quoted maybe the part I've found. So in essense it's an 80ns page mode (or
>static column, I could never tell the difference) 4 Mbit Dram with built-in
>refresh....
>
>Are you sure about the 8 high bits? So the RAM is asymettric (8 rows and 11
>columns)? I'll take 2K columns if that's really the case because I can keep
>the RAM asserted until I switch to a new page on them. Giving me 80 ns
>access time for all but the first access of a page. Hmmmm.

I don't think you're reading the data sheet correctly. The HM658512
devices does not have a "page" mode. All accesses take the same amount
of time, 80 ns from when CE* goes active. Then you must precharge the
device for 40 ns (tp), and allowing 5 ns each for CE* rise and fall
time, the cycle time is a minimum of 130 ns. (precharge is required
for ALL cycles, not just those that are not "in-page".)

Also, this part does not act like a "real" SRAM because the address
is latched on the falling edge of CE*. Changing the address during
CE* low has no effect, the address is only loaded during the falling
edge.

Aside from that, it's a cute part if you don't want to use a real DRAM.

>[ The Toshiba part had 1/2 clock (40-50ns) precharge with 130ns cycle time. I
>  can most definitely live with that for a whopping 2 Mbytes of memory for $108

This sounds like the Hitachi part also.

-- 
My opinions are my own.

Newsgroups: sci.electronics
From: hoffberg@medusa.aps.anl.gov (Mike G. Hoffberg)
Subject: Re: CC decoding TVs, commercial detectors (again)
Organization: Argonne National Laboratory, Chicago Illinois
Distribution: usa
Date: Mon, 14 Dec 1992 22:59:28 GMT

In article <1992Dec14.174730.4302@magnus.acs.ohio-state.edu> cwatters@magnus.acs.ohio-state.edu (Coyt D Watters) writes:
>Sears is selling a Zenith 25" (maybe 27") television with built in Closed 
>Caption Decoding now.
>
>[stuff deleted]
>
>I also saw the color change during commercials.


So closed caption can detect commercials...  Hum...

MIKE
-- 
Michael Hoffberg               /.\ <Build APS>   ~\   /~  "Jeez, am I the
hoffberg@phebos.aps.anl.gov   // \\ Argonne        \ /     only one who paid
hoffberg@anlaps.aps.anl.gov  //_O_\\ National       |      full price?" F.F.
                            /__| |__\ Lab   Boola! _|_ Boola!