waashk/20ng huggingface dataset:
In article <C5quI4.4CF@spk.hp.com> borowski@spk.hp.com (Don T. Borowski)   writes: > Dean Anneser (anneser@pwa-b.uucp) wrote: > : My 9 yr old son has signed up to do a science report on batteries.  I   was > : wondering if anyone could provide me with some information as to how   to > : construct a home-built battery.  In my grade school days, I remember   (snip!)  I haven't been following this, so I'm sorry if somebody already mentioned   this, but you could grab a lemon (I think potatoes work too, but I'm not   sure), a strip of copper, and a strip of zinc (I think you can get the   metal in a hardware store or hobby shop, maybe??).  Stick the strips in   the lemon (so they don't touch!) and you'll get a measurable voltage (not   a lot, but, hey, it's a lemon :-)  ).  As I recall we had to hook   something like ten of these things to get an appreciable amount of   current, because of the mondo internal resistance, but if you just need a   demo you might get it to run a tiny fan or something! :-)
In article <1993Apr26.124340.28057@sni.co.uk> mje@sni.co.uk (Mike Evis) writes: >Hi there, > >Does anyone know whether the PUFF RF design package is available >via ftp from any site? As I understand it, it is in the public >domain - please correct me if I'm wrong on this one. > PUFF is sold by CalTech, although very inexpensively for the quality. Source was also available for the earlier releases for a nominal charge, but I'm not sure if this practise is continued.    Regards, Stu Beal, VE3MWM, U009@CSX.CCIW.CA, National Water Research Institute, Burlington, Ontario, Canada.
In article <1qkf2hINN65c@rave.larc.nasa.gov>, kludge@grissom.larc.nasa.gov (Scott Dorsey) writes... >In article <C5JCH1.FrC@ulowell.ulowell.edu> wex@cs.ulowell.edu writes: >>In article <1993Apr15.100452.16793@csx.cciw.ca>, u009@csx.cciw.ca (G. Stewart Beal) writes: >>|> >	I was wondering if people had any good uses for old >>|> >256k SIMMs.  I have a bunch of them for the Apple Mac >>|> >and I know lots of other people do to.  I have tried to >>|> >sell them but have gotten NO interest. >>  Well,  if you're willing to spend a little money,  you could buy one of those IDE caching controllers (assuming you have an IDE of course) and put the 256K SIMMs on them.  Hardware cache!
Awhile back someone posted some information on where you can get kits to build an EEG.  Does anyone remember where you could get this.  I'm very interested in getting some info on this.  Thanks  in advance.  eric
Where can I buy or build a device that will convert 20 ma current loop signals to RS232 voltages?  I know some old terminals came with that option, but none of the ones I own have that.  Anyway, I want to connect a computer to this old industrial computer to use the computer with communications software as a console instead of an old DecWriter.  Please e-mail me if you have any info that would point me in the right direction.
In article <12426@sun13.scri.fsu.edu> jac@ds8.scri.fsu.edu (Jim Carr) writes: >[...] >I agree.  I come at this from nuclear physics, where one often discusses  >particle-hole excitations and certain reactions have the effect of  >applying an annihilation operator and creating a hole, and it is a  >subtle question.  The longer one works with them, the more real they  >become.  There are also quasi-particles, which raise the same sort  >of question about how "real" the entity is.  The phenomenon is most  >certainly a real one.   OK, I've asked this before, and with a new thread on these lines, I ask this again:  1: If a large hole current is run thru a resistor, will there be    I^2 * R cooling instead of heating?  2: Can anyone design an amplifier that preferentially amplifies    hole currents over normal electron currents?  3: what semiconductor materials have the highest ratio of    hole mobility to electron mobility? (please quote actual    test samples rather than estimates based on theory. Also,    don't be limited to semiconductors: consider also insulators,    resistors, dielectrics, piezo-electrics, conductors,    magnets (metal, ceramic), magnetostrictives, etc).  NOTES:     to summarize, this thread has so far stated that the only area    where holes are not detectable is the vacuum. That is, hole    particles only exist in the presence of matter.    Previous threads have stated that holes only exist in certain    semi-conductors. The question that naturally arises is if    the hole currents inside a semi-conductor vanish at the point    where the semiconductor is joined to a conductor (say, copper).    I don't want a theoretical discussion here about whether    holes could exist inside metal conductors, rather I ask for    an experimental discussion on how to amplify and detect such    currents *if* they exist.    Also note that I have cross-posted this to sci.electronics    since this is now becoming an electronic discussion.  Thanx, Eric.  ----  ET   "A Force of Nature"
In article <1993Apr2.174851.22659@cs.unca.edu>, kepley@photon.phys.unca.edu (Brad Kepley) writes: |> I just heard an unbelievable rumor that Motorola has decided to drop their |> integrated circuit manufacture business.  Apparently a Digikey rep called  |> one of our production coordinators, for out information so that we could |> make plans to deal with this, that Moto was getting out.  Anybody else |> get a call about this? |>  |> Too much for me.  It's about like Intel announcing they were getting out |> of the IC business.   This rumor didn't happen to appear on April 1st?  If this DigiKey rep was serious, I think I will buy my parts elsewhere. If that is the way they do business, you cannot trust them.
greetings.. I'm a novice in this area. I'm trying to gather info. on standard phone line settings. quick questions :       > if I just want to send out a beep over the phone lines,         can I do it with some function generator & tie it up to         one of those phone wires ??       > which one of those wires should I connect to my DTMF chip         as AUDIO IN ??   any help would be much appreciated..
In article <1993Apr3.110048.4636@hemlock.cray.com> kilian@cray.com (Alan Kilian) writes: >> jeh@cmkrnl.com > >This is almost exactly the reason I keep only the latest databook around. >Too many times last years books turn into three years ago and the data >in them doesn't match the current production parts. >TANSTAAFL, >                             -Alan Kilian  BUT... If you are in the habit of trying to repair old and obsolete machines, the old data books are a goldmine of information you can not get anywhere else. If you are trying to find a modern replacement for an obsolete part, the original specs really come in handy. Design out of the new books but save the old ones (or donate them to a ham).  If anybody in Phoenix disagrees, I'll drive over and help them 'get rid' of all their old data books.
I have a project in mind that requires an array of LEDs that can be addressed individually by a microprocessor (say, 16x16 or so).  Is there an LSI that is designed to drive an LED array (including RAM to hold the array state), or failing that, some way of multiplexing the display so I don't have to latch a bit for each LED using a discrete latch?  (I want to avoid having a huge board covered with 373s if possible!)  Thanks in advance...
jvannes@vms.macc.wisc.edu writes:   >You are probably referring to the products of >		 >		Opto Diode Corp. >		750 Mitchell Road >		Newbury Park Ca 91320 >		805 499-0335  >The make some amazing IRLED's.  The really high-powered devices are arrays of >3, 6, or 9, LED's on a TO-66 header.  The 9-chip model puts out 6.5 Watts in >response to a 5 Amp, 10 uS. pulse at a .5% duty cycle.  I think  these are >designed as illuminators for IR vision systems.  	Yeah! that's the guys!  >I would also be interested in the application here.  I work with a Dance and >Technology program, and want to build something to track dancers on a 30 foot >wide stage from 50 feet away.  	Yeah, that sounds a lot like lasertag anyway....  :-)
In article <1993Apr23.190152.13088@mprgate.mpr.ca> vanderby@mprgate.mpr.ca (David Vanderbyl) writes: >In article <9649@tekig7.PEN.TEK.COM>, alany@tekig5.pen.tek.com (Alan Yelvington) writes: >|> The battery goes dead primarily becaust the floor is cold.  The temperature >|> combined with self-discharge promotes sulfation which ruins the plates of  >|> the battery.  I strongly suspect that the only reason the battery doesn't >|> go dead as quickly on a dirt surface is because cement tends to be quite >|> cooler. > >Please explain how cement is able to maintain a lower average temperature >than dirt.  Sheesh.......  It's not the temperature, it's the karma.  You see, dirt has good karma, since it's all organic and full of living things, but cement is all squared off and artificial looking, and has lost its karma in the process.  Being a karma sink, it sucks all of the good karma out of the battery which is no longer able to keep a charge.  Because wood is also good and organic, putting a board between the battery and the cement will fix the problems.
Does anybody out there have one of those food dehydrators I've been seeing all over late-night TV recently? I was wondering if they use forced air, heat, or both. If there's heat involved, anybody know what temperature they run at? My wife would like one and I'm not inclined to pay >$100.00 for a box, a fan and a heater. Seems to me you should be able to throw a dehydrator together for just a few bucks. Heck, the technology is only what? 1,000 years old?
I'm looking for some specs for a Toshiba TA6267-BP.  It appears to be a power amp housed in a 7-pin inline package and is used in my Mitsubishi VCR, circa 1985, as a DC motor controller for the tape drive.  Checking in the oldest IC Master I have (1990), I don't see it listed, and it appears to have been discontinued.  If anyone has anything on this part, I'd be *greatly* indebted!  thanks in advance,
In article <1993Apr6.005150.10250@ee.rochester.edu> neale@ee.rochester.edu (Reg Neale) writes: >I'm trying to figure out how to operate a Pioneer Laserdisc LD-1000 that I bought at a surplus store. It is reputedly from some kind of computerised viewing >and/or ordering system. THere is what may be an HPIB connector on the back. When >I power it up, the front panel power light comes on, but no activity, and the >door doesn't open. Anyone have any experience with this unit or any ideas on how >to obtain documentation?  What you have is one of the LD players from a video game (Dragon's Lair, Space Ace, etc). Call Pioneer Technicial Support 213-498-0300 (at least that's the number I called them at) and ask for the LD-V1000 Interface Guide. It shows how the parallel interface should be wired and the codes for the commands (play, pause, reject, etc). The guide is mainly for hooking the player to a computer, but with a little work, you could build a wired controller.
--  I would like to be able to detect the angular position (low accuracy) of an IR emitting source at a distance of about 100 meters (more is better) in daylight.  The IR source could be emitting a signature; I'm leaning toward 30 KHz square wave with 50% duty cycle.  I am considering the use of a quadrant detector from Centronic Inc. to give information to a pan/tilt head to point the sensor and thus determine the angles.  For the source I am considering wazing the heck out of an IR LED(s), possibly an Optek OP290 or Motorola MLED81.  Wazing would mean at least 1 Amp current pulses.  At this current the duty cycle of the LED drops to 10% and I would need to cycle five of them in turn to get the 50% required.  Has anyone done something like this?
mbattist@magnus.acs.ohio-state.edu (Mark A Battisti) writes:  >I am interested in finding a supplier for an array of leds on material which is >transparent when nothing is lit.  >I'm not quite sure what LCD screens are like away from the laptop but I would  >guess they are not too clear.  >An ideal item would be an LED array for which each LED is about 1/2" square.   >(Yes very course)  This is for distance viewing, but on a window.  >Any pointers of suggestions would be much appreciated.  What, pray tell, are you putting together?  And what about costs?  And does it have to be transparent as in totally transparent?  Or just transparent enough to allow light from the other side to shine through?
Eric H. Taylor writes > ... If you are determined > to go faster, get an airplane. They dont have speed limits.
rubin@cis.ohio-state.edu (Daniel J Rubin) writes: >How hard would it be to somehow interface them to some of the popular  >Motorola microcontrollers.  Not hard, you can do the refreshing and access cycles by software, but this hogs most of the available CPU cycles on a low-end controller. I've seen some application note from Philips that used one of their 8051 derivatives as a printer buffer, with up to 1MB of dynamic ram that was accessed and refreshed with software bit-banging.  Another alternative would be to use one of those nice DRAM controller chips that "create static RAM appearance" and all that, but they may be too expensive to make it worthwhile.
In sci.electronics, rgc3679@bcstec.ca.boeing.com (Robert G. Carpenter) writes:  > I'm wondering if it's possible to use radio waves to measure the > distance between a transmitter(s) and receiver?  Yes. It's called RADAR.  > Seems to me that you should be able to measure the signal strength > and determine distance. This would be for short distances (2000 ft), > and I would need to have accuracy of 6 inches, or so.  Depends on the environment: in a static environent such as a waveguide yes, in a dynamic environment (with objects moving about) the multipath kills this concept.  > How about measuring vertical distance as well, any chance - or am I getting > ridiculous?  What is the difference between vertical and horizontal?  > What frequencies would be best for this? Or does matter?
The Fujitsu 2322 uses what is known as an 'SMD' interface (Storage Module Device?).  A lot of older minis used it.  Sun still does on their server models.  There are several different speeds of SMD, and I think that the  Fuji drive you have is rated at about 24 Mb/sec (thats megabits).  There used to be several companies that made couplers for the PC (Interphase in Texas being one), but I think that the market pretty much has dried up. Controllers for this type of drive are readily available for VME buses though.  Rumor has it that there is a SMD to SCSI adapter available, but I think that it was designed for slower SMD devices.  In other words, if you have a PC or Mac, that drive is pretty much dogmeat. Cheers, Corwin
In article <293@kc2wz.bubble.org> bob@kc2wz.bubble.org (Bob Billson) writes: >kennehra@logic.camp.clarkson.edu (Rich"TheMan"Kennehan) says: >>Hi.  I was doing research on subliminal suggestion for a psychology >>paper, and I read that one researcher flashed hidden messages on the >>TV screen at 1/200ths of a second.  Is that possible?  I thought the > >Take a look over in alt.folklore.urban.  There is a thread about subliminal >messages on TV.  The fact that subliminal messages don't work aside, an image >can't be flashed on a TV screen fast enough to not be noticed.  Well, yes and no.  The _image_ can't be on the screen less than 1/30 of a second, but a _mixture_ of images that's about 90% of the field that was supposed to be there and 10% of the 'subliminal' addition could be overlaid for one field, producing the same overall effect to our sluggish retinae of a discrete image projected for 1/300 second.  ..although, like the previous poster, I have to reserve my doubts about the effectiveness of said discrete image in steering my subconscious around ..
ritterbus001@wcsub.ctstateu.edu writes:  >If you want to buy one, try Radio Shack, or else a TV repair shop can >probably order one.  BTW - the carrier frequency is 40 KHz, and each >different TV/VCR/cable box/stereo manufacturer uses a unique pulse >scheme to perform each different function on their equipment.  	Some TV's, including my RCA set at home, uses simple carriers which I think run between 32 and 36 or 38 KHz.  There is no tone decoding in it.  All one has to do to piss the thing off :-) is just hook an IRLED up to a variable oscillator and tune through.  Wreaks all kinds of havoc.  :-)  	Similarly, my VCR remote changes channels on my cable box.  Always seems to change the cable box to channel 5 when you do the pause/play.  	SOOOO, some things do have some overlap to them.
Does anyone know of any type of acceleration sensor that has an electrical output of any sort?  It would only have to sense acceleration in one direction.  Thanx,  Mike  --
alee@ecs.umass.edu writes:  >  > Greetings! >        >         Situation:  I have a phone jack mounted on a wall.  I don't >                     know the number of the line.  And I don't want >                     to call up the operator to place a trace on it. >  >         Question:   Is there a certain device out there that I can >                     use to find out the number to the line? >         Thanks for any response. >                                                     Al >  >     Dial 511 and it sound tell you the number.
In article <1993Apr20.102756.1709@mala.bc.ca> wagner@mala.bc.ca (TOM WAGNER, Wizzard of old Audio/Visual Equipment........Nanaimo Campus) writes: >In article <C5r60r.4ID@megatest.com>, alung@megatest.com (Aaron Lung) writes: >> In article <C5qsBF.IEK@ms.uky.edu> billq@ms.uky.edu (Billy Quinn) writes: >>>I built a little project using the radio shack 5vdc relays to switch >>>audio.  I got pretty bad 'clicks' when the thing switched.  I was doing >>>My question is: >>>	Is there a good relay/relay circuit that I can use for switching >>>audio, so that there will be *NO* noise of any kind on the audio lines. >>  >> Are you switching high level signals or low level signals like pre-amp >A novel circuit I used to build was a primitive "optical isolator".. It consists >of a resistive photocell and a lamp, all packaged in a tube.  When the lamp is >off the cell is high resistance.  Turn the lamp on and the resistance lowers  I use an H11F1   FET optoisolater to switch microphone level signals. There is no click, since I put a .1uF cap across the LED.  Distortion measurement are very low with mic level, and they went up to 0.03% at a + 14 dB line level.  All I did was put the FET in series with one leg of the balanced line.  No hums, pops, just audio jumping out of silence. The FET runs about 100 million ohms with the LED dark and drops to 150-200 ohms with it on.
In article <C5qwv2.Bz0@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes: >In article <sgberg.23xu@charon.bloomington.in.us> sgberg@charon.bloomington.in.us (Stefan Berg) writes: >>... I don't know why my FPU has an XC (my original 33MHz FPU >>was label MC68882-33), but it seems to work fine on my system... >>P.S. Or does it mean eXperimental Chip instead of Motorola Chip? .-) > >The rule for the designations is that if it says MC, that means it works >*exactly* the way the datasheet/book specifies.  If it says XC, that means >there is at least one known bug.  Often these bugs are small and obscure; >you might never run into them in practice. >  XC units are often pre-production sample devices.  Those are normally distributed for evaluation as freebies and are not guaranteed to meet every spec.  >At least Motorola admits it, unlike certain other companies...  Yep, that's for sure...that's one thing I like most about Motorola.
I've got a 4PR1000A (EIMAC) unused transmitter tube for sale. Best offer so far is $125. That's getting close to what I'll sell it for. Hamfest prices have been about $200 - $250. It works, guaranteed. Original packaging. --  --------------------------------------------------------------------        Dave Medin			Phone:	(205) 730-3169 (w)     SSD--Networking				(205) 837-1174 (h)     Intergraph Corp.        M/S GD3004 		Internet: dtmedin@catbyte.b30.ingr.com   Huntsville, AL 35894		UUCP:  ...uunet!ingr!b30!catbyte!dtmedin
I sent a 2400 baud modem to a cousin in Greece from the U.S. and it is working fine for him. It also worked for me in U.S.  -Jim.
I would appreciate very much the address and/or phone # of  this company. They supposely make analog EEPROMS. Thanks in advance.
In article <C5qsBF.IEK@ms.uky.edu> billq@ms.uky.edu (Billy Quinn) writes: >I built a little project using the radio shack 5vdc relays to switch >audio.  I got pretty bad 'clicks' when the thing switched.  I was doing >most of the common things one is supposed to do when using relays and >nothing seemed to get rid of the clicks. > > >My question is: > >	Is there a good relay/relay circuit that I can use for switching >audio, so that there will be *NO* noise of any kind on the audio lines. > > >I will appreciate any advice or references to advice.  Also, exact part >numbers/company names etc. for the relays will help!  Are you switching high level signals or low level signals like pre-amp out level signals?  Also, are the clicks you mentioning the big clack that happens when it switches or are you refering to contact bounce?  How are you driving the relays?  TTL gate output?  Switching transistor?  How are the relays connected to what you are driving?
In article 3nx@athena.cs.uga.edu, mcovingt@aisun3.ai.uga.edu (Michael Covington) writes: >In article <1993Apr21.204556.21262@cronkite.ocis.temple.edu> camter28@astro.ocis.temple.edu (Carter Ames) writes: >> >>  Why does a lead acid battery discharge and become dead (totally unuseable) >>when stored on a concrete floor?   >>  I decided to bring the battery in from the lawn mower and the motorcycle >>from the unheated garage this year, *to preserve them* and I just >>went to use them and noticed that not only do they not work, but  >>they act like the two terminals are shorted.  I asked a friend >>and he said that you should never do that, 'cause it ruins them, >>but he couldn't tell me why. > >This topic was beaten to death a year or so ago.  It seems to me that the original question was for advice on his problem not a history lesson - I think that  if this question comes up from time to time then people should get a civil answer    >  >The concrete is not the problem.  > >Lead-acid batteries often fail from disuse (not being charged for a long >time), but there's no way the concrete floor could be the cause of the >problem.  Could ANYONE please explain WHAT happens with a battery and is there any cure to get it back into life    >
hjkim@hyowon.pusan.ac.kr (Hojoong Kim) writes:  >Hi Netters!  >I am looking for the list of universities in Austrailia, which has electronics department.  >I am considering to spend a year for research in Austrailia about communication area.ýé I am interested in Mobile communication areas and spread spectrum communications etc.  >But I don't have any information about Austrailian Universities. >Can anybody recommend a good university in coûßmmunic÷³ation area? >Any comments will be welcomed!  Can I suggest the University of Western Australia in Perth. The weathers great, the people are great and our Electronic Engineering department is great. I am a first year student here ... so I don't know much about what projects but I do know they have a good reputation in the fields of dsp and communications.  Ever heard of QPSX?  The people who own are ex-UWA ... so that gives an indication of what the department is like.  For more information email: yianni@swanee.ee.uwa.edu.au with the above request and he should be able to tell some more info  or write  Department of Electrical and Electronic Engineering University of Western Australia Stirling Highway CRAWLEY 6009 Western Australia Australia   Yours Mark  mtearle@tartarus.uwa.edu.au