HDTenEightyP/NetNews huggingface dataset:
From: piper@bach.udel.edu (Jon Malenfant)
Subject: Subwoofer Crossover Design Question?
Organization: University of Delaware
Date: Mon, 11 Jan 1993 20:45:20 GMT

  I have two good 12" woofers that I would like to make into
  subwoofers.  I figure one subwoofer is more than good enough.

  There are two ways I would prefer:  1) Where I attach the subwoofer
  to channel "A" and attach the satellite speakers to "B"; 2) Where
  the subwoofer has two inputs and two outputs (one for each channel)
  where the satellite speakers attach to the outputs on the
  subwoofer.

  Does anyone know how to build the crossovers for either of these
  setups?

  Any help is greatly appreciated!

-- 
*********************************************************************
*  Jon R. Malenfant     "Nothing in the world compares to flying!"  * 
*  piper@bach.udel.edu         piper@freezer.cns.udel.edu           *
*********************************************************************
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: CATV Block Converter Wanted
Date: Tue, 05 Jan 93 04:16:41 GMT
Reply-To: paula@nlbbs.uucp
Distribution: world
Organization: The Electronics Workbench - Cumberland Maine


In article <30DEC199211465212@lims02.lerc.nasa.gov> afpauls@lims02.lerc.nasa.gov writes:

 > 
 > I would like to buy a cable TV block converter, the cable converter that 
 > translates the entire cable band the UHF band.  I want to get one to use it 
 > on a TV that channels 2-6 don't work but everything else is fine.  
 > 
        I can get 'em from my distributor. About $20.

        * * * * * * * * * * * * * *  * * * * * * * * * * * * * * *
	*   Paula Stockholm              paula@nlbbs.UUCP        *
        *   232 Main Street                                      *
        *  Cumberland, Maine 04021    !nlbbs!paula@uunet.uu.net  *
        * The Electronics Workbench        (207) 829-3152        *
	* * *  * * * * * * * * * * * * * * * * * * * * * * * * * *
From: whb@castle.ed.ac.uk (H Bruce)
Newsgroups: sci.electronics
Subject: Surface Mount EEPROM with I2C interface.
Date: 12 Jan 93 12:08:52 GMT
Distribution: sci
Organization: Dept. Electrical Engineering, Edinburgh University, Scotland, UK.

I am looking for a  256 X 8 byte surface mount EEPROM with I2C an interface.
There are DIL parts such as SGS Thomson ST24C02, but they don't seem to have
SMT equivalents. 

Can anyone comment ?


Thanks,

Henry Bruce
Newsgroups: sci.electronics
From: dave@imax.imax.com (Dave Martindale)
Subject: Re: How to convert RS-170A RGB to NTSC cheaply?
Organization: Imax Corporation, Mississauga Canada
Distribution: na
Date: Mon, 11 Jan 1993 07:08:18 GMT

ron@vicorp.com (Ron Peterson) writes:
>Is there a cheap way to convert RS-170A RGB&Sync to NTSC?  I seem
>to remember an article in Radio Electronics but can't find it.
>Would it be as simple as using a high speed op amp to sum them?

If you just want a B&W signal, yes, you don't need much more than
a few resistors and a video-bandwidth op amp.

But if you want colour, it's much more complicated.  Basically,
you need to convert RGB into Y (luminance, the B&W signal above)
plus two colour difference signals (R-Y, B-Y), then lowpass filter
the colour difference signals, then use them to amplitude modulate
two colour subcarrier signals.  The subcarrier signals are derived
from the same crystal oscillator, but with a 90 degree phase shift
between them.

There is a single chip that does most of this for you, if you're
not too fussy about quality.  I don't know its part number, though.

	Dave
From: devon@digex.digex.com (Devon Sean McCullough)
Newsgroups: sci.electronics
Subject: CCD analog shift register?
Date: 9 Jan 93 00:11:45
Organization: /homeb/devon/.organization
Distribution: sci
NNTP-Posting-Host: access.digex.com

Where can I get an analog shift register?  It's not in any catalog I
have seen.  I want to hack up a gadget to slurp up part of a video
scan line and spit it out more slowly a little later.
Xref: sparky sci.electronics:22445 sci.energy:6799 rec.autos:31516
From: ems@michael.apple.com (E. Michael Smith)
Newsgroups: sci.electronics,sci.energy,rec.autos
Subject: Re: Flywheel batteries as EV power source
Date: 12 Jan 93 00:34:28 GMT
Organization: Circle 'C' Shellfish Ranch, Shores-of-the-Pacific, California

In article <1993Jan9.183414.19078@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>In article <1993Jan8.010401.6096@cis.ohio-state.edu> rubin@skiing.cis.ohio-state.edu (Daniel Rubin) writes:
>>
>>I think comparing expanding gases or fluff or whatever in a flywheel and 
>>that of gunpowder in a gun barrel is not justified.  The gasses released
          ^^^^^^^^^
>>from black powder in a gun barrel act to push an object to "mach 1" or
       ^^^^^^^^^^^
       It is worth noting that these are two DIFFERENT things!

>>whatever speed was posted earlier in ONE direction.  You cannot compare this
>>to gas or whatever explaning in 3-D space.  I pile of black powder won't move
>>an object placed on top of it at all or a very small amount, probably 1/100000
>>the acceleration of it in a barrel.  That actally turns out to be a great
>>example. In a previous post it was said that 7 grains of black powder can
                                                           ^^^^^
I think it was 7 grains of Bullseye Smokeless powder.  Blackpowder loads
are usually double digit... things like '40' grains are common...

It may seem like a nit, but it is an important one ... the two materials
have far different behaviours when on fire, both contained and open.

>>push a bullet to mach 1.  That may be true IN A GUN BARREL.  Take 1 pound of
>>black powder and place it on the ground and put a bullet on top of the pile.
>>Light the pile and you get a lot of fire and heat and the bullet will most
>>likely not even budge, just get really hot!  I wish I could include the 
>>amount of hot gasses released from a pound of black powder as compared to 
>>7 grains, but I can't and the ratio between 7 grains and 1 pound should
>>describe the situation well enough...
>
>I urge you not to try this experiment at home. Blackpowder is a primary
>explosive rather than a flamable solid. It can explode *unconfined*
>when ignited in amounts of 1 pound or more. That explosion will be more
>intense than that of a similar amount of dynamite, which will also 
>explode unconfined. To dispose of blackpowder safely by burning, you
>must spread it thinly along the ground in trains and ignite only one
>end, allowing it to burn *slowly* with the heat rapidly conducted away
>by the large mass of air to which it is exposed.
>
>Gary

Very good warning Gary!  Best way to dispose of black powder?  Dust
it over your lawn as fertilizer... and water it in.

-- 

E. Michael Smith  ems@apple.COM

'Whatever you can do, or dream you can, begin it.  Boldness has
 genius, power and magic in it.'  -  Goethe

I am not responsible nor is anyone else.  Everything is disclaimed.
From: s892840@minyos.xx.rmit.OZ.AU (David Robert Webb)
Newsgroups: sci.electronics
Subject: Any 32 channel TDMs out there??
Summary: Anyone seen any 32 channel TDM's on hte market?
Keywords: multiplex
Date: 5 Jan 93 14:10:50 GMT
Organization: RMIT Computer Centre
NNTP-Posting-Host: minyos.xx.rmit.oz.au


 Just a quick question. I'm looking for a 32 channel, 64kbit/channel
 time division multiplexor. Preferably in the one chip. One must exist,
 but im buggered if i can find it. Any other relevant info would also be much appreciated.

 Dave Webb... RMIT, Melbourne Australia.
Newsgroups: sci.electronics
From: hoffberg@medusa.aps.anl.gov (Mike G. Hoffberg)
Subject: Re: MouseSystems Mice
Summary: convert Sun mice to PC mice
Organization: Argonne National Laboratory, Chicago Illinois
Date: Wed, 6 Jan 1993 19:09:20 GMT

Does anyone know of an adapter cable to convert the Sun optical mouse
to be able to be used on the PC?

Will it use the standard Mouse Systems drivers?

Once converted, will it then be a Bus or Serial/PS2 style mouse?

Is it just as simple of looking up the pinouts for both and making a
cable?

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!
Newsgroups: sci.electronics
From: bew@brahms.udel.edu (Ben Williams)
Subject: VCR video head removal
Organization: University of Delaware
Date: Tue, 5 Jan 1993 02:48:21 GMT

Hey, I am trying to fix this VCR and I have concluded that the video heads
must be worn down (the only way the picture is clear is if I put a lot of
back tension on the tape -- so much so that the sound starts to be effected).

So I found where I can get a pretty cheap replacement head.  The problem is
I can't get the !@#$%^&* thing off!!  I unscrewed the two screws on top and
pulled and it just doesn't come off.  There is even an allen screw underneath
but THAT didn't help.  I don't see what all these screws are for if removing
them doesn't effect anything!  Do I need a special tool for this or something?
Or do I have to pull the whole head assembly out?  Its a SYLVANIA VC2234SL01.

Ben.

-- 
Ben Williams
bew@brahms.udel.edu

               What we got here is a failure to communicate...
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: Laser gunsights (was: Info on CO2lasers wanted
Date: 10 Jan 93 08:11:14 GMT
Organization: Kernel Mode Consulting, San Diego, CA

In article <1993Jan09.101114.7239@actcnews.res.utc.com>, 
Bob.Clarke%bbs@actcnews.res.utc.com (Bob Clarke) writes:
> In message <6899@tuegate.tue.nl> dated 8 Jan 93 12:44:28 GMT
> wouter@blade.stack.urc.tue.nl (Wouter Slegers) writes:
> 
>> jeh@cmkrnl.com wrote:
> 
>> : I would also point out that the claim of "perfect targetting" for a laser 
>> : gunsight just isn't so -- elevation and windage still are factors -- 
>
>> Correct, but it does give some extra targetting info..
>> 
>> : *seeing* the dot of light from a 2 mW laser at any reasonable distance, in 
>> : anything other than pitch blackness, is damned near impossible.  
> 
> True, but laser targeting systems do not use the naked human eye!!!  Most
> laser targeting system do not operate in the visible range, and are used 
> in conjunction with a remote viewing device such as night vision.  The army 
> has a system were they bore sight a laser to a m16 rifle, the user is wearing
> night vision goggles, the laser is only visible to people wearing goggles. 
> Where ever the dot lands is dead!  It is good to about 50 yards, I think!

(1) The subject under discussion was not a military laser targeting system.  If
you had bothered to read the entire thread, rather than thinking you could jump
into the middle and explain everything to everyone, you would have seen that my
comments were in response to an article which proposed strapping a 2 mW HeNe
atop a rifle.  No IR lasers, no beam modulators, and certainly no night vision
goggles keyed to the beam modulator.  (The latter two points, btw, are
essential if the system is to work in anything other than total darkness.)  In
that context my objections are entirely justified. 

(2)  I suggest you go back and reread those back issues of _Guns and Ammo_ or
_Soldier of Fortune_ (reading obviously being the closest you've ever gotten to
a military rifle).  Nobody in their right minds, and not the military either,
would bother with such a system if it was limited to a 50 yard range.  

P.S. - in the future, try reading _Defense Electronics_ instead.  Or if that's
too difficult (I realize, there's lots of fine print and comparatively few
pictures), at least THINK a little about what you're writing.  Christ, if my
enemy is only 50 yards away, I don't need precision sighting -- I'll just empty
a clip in his general direction.  

	--- 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
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Where to mount an outside temp probe on a car?
Organization: Motorola Computer Group, Tempe, Az.
Date: Tue, 5 Jan 1993 19:19:32 GMT

In article <1993Jan5.050543.28601@cis.ohio-state.edu> rubin@clam.cis.ohio-state.edu (Daniel Rubin) writes:
>>>BZZZT!   He _wanted_ the air temperature -- which means he _wants_ _maximum_
>>>"cooling" of the sensor.
>>>
>>
>>Excuse me but if you cool the sensor by placing it in an airstream, your
>>not reading the actual temperature of the air. Reading a sensor cooled
>
>Hmmm...  You cannot get the probe any cooler than the temperature of the 
>air flowing around it no matter how fast the air is flowing!  If anything

OK, If we ignore the effects of humidity and air pressure, you can say
that the airflow has no effect on the temperature reading. I guess I'm
being a little over accurate. I mean, we were looking for 0.001 degree
accuracy right? :-)

John


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Newsgroups: sci.electronics
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Subject: Re: Tube Amplifier Design Questions
Organization: Northeastern Ohio Universities College of Medicine
Date: Tue, 05 Jan 1993 14:12:00 GMT

Instead of worring about the tubes, the better question is, "where
can I find output transformers to handle 200 watts?"  From
experience, I know those will be difficult to find and expensive
when you do.  I found a few UTC "Ultralinear" transformers several
years ago at Fair Radio Sales.  I like the Williamson ultralinear
design with tetrodes.  6L6 derivative tubes are pretty good, as a
lot of output trnasformers are desinged with those in mind.  That
includes 6L6, 1614 metal envelope and KT-88s.  A pair of 6L6s is
good for driving about 30-40 watts.  Going up to 200 watts is probably
better done with industrial type tubes such ass 6550s or 6080s.
I picked up some Amperex 6L6 tubes at a hamfest last year to
replace the 1614s in a Macinthosh MC-30.  The Amperex tubes have a
very nice sound in the MC-30.

You'll have to go back to the 1950s and early 1960s to find much
useful literature.

I always thought it would be fun to make an audio amplifier out
of something like Eimac 4CX150 tubes.  The execution would be awful
since those tubes need somewhere around 1800 volts on the plate.
That would reqire a pretty exotic output transformer and forced air
cooling.  In fact, we used to have a 60 Hz to 400 Hz power
converter rated at several KW that used 4CX150s.  I think it had 8
tubes and a GIANT transformer.  It dated to about 1964, before
semiconductors that could handle those sorts of power levels were
affordable and/or reliable.

Unless you have tube nostalgia and/or want a PA for music performance
applications, I'd forget about making a tube power amplifier and
design with transistors.


-- 
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: karp@skcla.monsanto.com
Subject: Re: the electric car
Organization: Searle, Skokie, IL
Distribution: sci
Date: Thu, 7 Jan 1993 14:22:32 GMT

In article <19934.4265.27484@dosgate>, "lester hiraki" <lester.hiraki@canrem.com> writes:
> to:  ee905jc@brunel.ac.uk
> 
> TJ>  Newsgroup: sci.electronics
> TJ> Message-ID: <Byw633.Jn@brunel.ac.uk>
> TJ>    Subject: The Electric Car
> 
> TJ>Can anyone point me in the direction of any good introductions to the
> TJ>concepts/problems/etc with electric cars?
> 
> TJ>Thanks
> 
> TJ>Tim Chappell
> TJ>ee90tjc@brunel.ac.uk
> 
> Look for the November 1992 issue of IEEE Spectrum Magazine.
> This issue is almost devoted to electric cars.
> ---
>   DeLuxe 1.21 #786  
> --
> Canada Remote Systems  - Toronto, Ontario
> World's Largest PCBOARD System - 416-629-7000/629-7044


And it wasn't a very good article.  Try the EV mailing list if you want the net 
know-it-alls. :-)

Jeffery
karp@skcla.monsanto.com

not yet a net know-it-all but in training
From: mpaul@unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: Re: PC BOARD ETCHING QUESTIO
Date: 11 Jan 1993 17:19:20 GMT
Organization: University of Nebraska--Lincoln	
Distribution: world
NNTP-Posting-Host: unlinfo.unl.edu

The other item I always include on my artwork is TEXT of some sort, so
that I don't screw up and put the negative on my board backwards.

--
paul marxhausen .... ....... ............. ............ ............ .......... 
 .. . .  . . . university of nebraska - lincoln .  . . .. . .  .. . . . . . . .
 .     .    .  .   .     .   .  .    .   .  .   .    .   .  grace .   .    .  . 
   .         .       .      .        .        .      .        .   happens .     
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Where to mount an outside temp probe on a car?
Organization: Motorola Computer Group, Tempe, Az.
Date: Mon, 4 Jan 1993 13:40:28 GMT

In article <1993Jan4.002944.6494@sequent.com> washer@sequent.com (Jim "Throw it over the wall" Washer) writes:
>I'd like to mount a temp probe on my car to sample the air temp. I'd like
>to get as accurate a reading as possible (without exceeding some reasonable
>cost).
>My biggest concern is getting false reading if the probe gets wet, and reads
>too low due to evaporation..
>Has anyone done this? Where did you mount the probe... How did you protect it?

I think I'd try either in the trunk, or inside one of the tail-light
assemblies first. At sixty miles per hour, the airstream hitting the
sensor will cool it nearly as much as being wet. You need to find
someplace outside of the airstream, where it wont get wet, and it's
not near any heat source.

The glove box?  :-)
John

-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
From: cdl@chiton.ucsd.edu (Carl Lowenstein)
Subject: Re: Microwave Oven Plasma Etcher? (definitions)
Keywords: microwave, Reike and Hartree diagrams, Gerling Labs
Organization: Marine Physical Lab, UC San Diego
Date: Fri, 8 Jan 1993 16:51:41 GMT

In article <1ii7fgINNh20@shelley.u.washington.edu> whit@carson.u.washington.edu (John Whitmore) writes:
>In article <1993Jan7.005550.6869@kodak.kodak.com> ornitz@kodak.kodak.com (Barry x24904/ER/167B-TED) writes:
>	
>	In the context of the original question (lowering the power
>density in the microwave oven), this is irrelevant.  First, the
>load is the contents of the microwave oven (and this can, we all know,
>vary quite a lot without stalling the oven).  Second, we don't
>care about the exact frequency (nor the exact power); only large 
>power-output changes are of interest.

Most of the higher class microwave ovens I have seen vary the (time)
average power output by varying the duty cycle of the magnetron.

Older ones do this on ten-second time scale (power knob changes the
duty cycle between 1 and 10 seconds out of every 10).  Newer ones
with electronic controls seem to change the duty cycle on about a
1/4 second time scale.  Maybe this would be helpful, depending on
the thermal time constant of your plasma etching process.

-- 
        carl lowenstein         marine physical lab     u.c. san diego
        {decvax|ucbvax} !ucsd!mpl!cdl                 cdl@mpl.ucsd.edu
                                                  clowenstein@ucsd.edu
From: M.BANNACH@LDB.comlink.de (Matthias Bannach)
Newsgroups: sci.electronics
Distribution: world
Reply-To: m.bannach@ldb.comlink.de
Subject: Weitek-AMD-...Adress ?
Date: 6 Jan 93 14:51:00 +0100
X-Gateway: ZCONNECT UL LDB.comlink.de [UUCPfZ V3.6a U002]

Hello,

I'sorry to send a public question but I'm searching for some E-Mail Adresses.
It's urgent, 'cause I have no FAX adress and a tel. call is too expensive for
detailed questions and even though a Letter would be too slow.

What I am looking for is the E-Mail Adress (if exists) for these companies :

1.) AMD, 901 Thomson Place, Sunnyvale Ca. 94088

2.) Bipolar Integrated Tech., 1050 N.W. Compton Drive, Beaverton Oregon 97006

3.) Texas Inst. P.O.Box 401560, Dallax Tx. 75240

4.) Raytheon Semiconductors, 350 Ellis Street, Mountain View Ca. 94039-7016

5.) Weitek Corporation, 1060 East Arques, Sunnyvale Ca. 94086

I hope somebody out there has an Idea. Every help is very welcome !

Thanks, Matthias


------
..always look on the bright side of live      ORIGIN : M.Bannach@ldb.zer
FIDO   : Matthias Bannach 2:241/3431        INTERNET : M.Bannach@ldb.comlink.de
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Battery Gell cell or Lead acid?
Date: 6 Jan 93 02:16:48 GMT
Article-I.D.: shelley.1idfegINNdsh
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <1993Jan5.145618.8600@oclc.org> fhn@oclc.org (James Feehan) writes:
>I am in the process of making a rechargeable bicycle light and wanted to know 
>which type of battery would be better Gell Cell or a Lead Acid. What are the 
>pros and cons of each? I have heard that it's not a good idea to fully 
>discharge a Lead Acid

	Gel cells are lead/acid storage batteries with a semisolid
(gelatinous) acid electrolyte.  You can't spill acid from them.
Neither type is sensitive to cold (unless you live in Minnesota...)

	Neither type should be stored discharged, because the formation
of insoluble sulphates on the lead make the battery difficult to
charge (and raise its internal resistance, permanently).

	I use gel cells on my bike; it works out fine.

	John Whitmore
From: edharris@ohstpy.mps.ohio-state.edu
Newsgroups: sci.electronics
Subject: Re: Microwave Oven Plasma Etcher? (results)
Date: 8 Jan 93 13:28:25 EST
Organization: The Ohio State University, Department of Physics

In article <C0Is05.Fst@ve7frg.ampr.org>, doug@ve7frg.ampr.org (Doug Collinge - VE7GNU) writes:
> Why don't you waste some of the power by boiling some water
> away or something like that?  Shouldn't be hard to get rid
> of 350W worth of steam...

Many people have suggested this, and actually it's one of the first things I
tried. I put in a beaker of water and tried adjusting the amount of power by
varying the amount of water.

Unfortunately though, if you put in too much water, it seems to kill the
plasma. If you back off a bit on the amount of water, then the plasma/gas combo
is still too hot. It behaves in an either/or manner: either too much power, or
no plasma! Maybe there is a way to overcome this problem.

Since I had nothing to loose, I tried John's suggestion of lowering the value
of the capacitor in series with the magnetron. So far, this works, but I'm not
sure if the magnetron is being damaged in some way. 

My question is: what is the nature of the damage  by operating the
magnetron in this way? Barry? Although the tube (claimed 60% efficient) may
dissipate a greater percentage of its input power as heat, it should also 
be drawing less total power due to the lower capacitance. ????

If nothing else, I've learned quite a bit about microwave ovens! Thanks!

Ed
Newsgroups: sci.electronics,rec.music.synth,comp.music