waashk/20ng huggingface dataset:
>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 seei >: the 'ice cube tray' version, but I don't remember what to use as a good >: electrolyte or what the easily obtainable metals were. >: >: Thank you in advance.  >I remember watching a whole "Mr. Wizzard" program on this subject when >I was a kid.  The battery constructed on the program which made the >biggest impression on me, and generated the most power, was made using >a galvanized bucket (for the zinc) and a copper toilet tank float.  The >electrolyte was sauerkraut!  Take a lemon.  Stick a copper strip into the lemon.  Stick a galvanized nail in about 1 to 1-1/2 inches from the copper strip.  You should get about 1/2 volt from it - enough to light an LED.    * SLMR 2.1 * Support your medical examiner, die strangely.
In article 1qub4mINN7r3@rave.larc.nasa.gov, kludge@grissom.larc.nasa.gov (Scott Dorsey) writes: >In article <20756.2bd16dea@ecs.umass.edu> 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? > > >Call a friend long distance, collect.  Ask to speak with yourself.  When >the operator asks for you, you won't be there, so ask the operator to leave >your number.  She'll read it out in the clear. >--scott  Even easier, my area supports 311.  Dial this and a recording recites your number. Phone techs use it to verify an installed line. --- 			Gary Gendel Vice President:				Current consulting assignment: Genashor Corp				Mentor Graphics Corporation 9 Piney Woods Drive			15 Independence Boulevard Belle Mead, NJ 08502			Warren, NJ 07059
In article <1993Apr23.102935.17390@miavx1.acs.muohio.edu> sjmadsen@nextsrv.cas.muohio.edu (Steve Madsen) writes: >	Do you know any assembly language at all?  All anyone needs to do if >find the part of the code that does the quiz, and insert a JMP instruction >to just completely skip it.  Not that difficult, really!  And there is very >little that commpanies can do to stop this type of thing.  Using PKLITE or >some similar utility would help, but only if the resulting compressed .EXE >were tagged as uncompressable.
Could someone point me toward a source (FTP/BBS/whatever) for development tools for the 8051 microprocessor.  I specifically am looking for a Macintosh cross-assembler/disassembler.  Also, is there a mailing-list dedicated to discussing the 8051?  Thanks.
shiekh@ictp.trieste.it (Andy Shiekh) writes:  >  I have seen the existance of electronics solder with a 2% silver >content that seems to have good wetting and fatique reatings. >  Can anyone tell me why it is not used? (silver is not such an expensive >metal).     This is called silver bearing solder.   It is used to solder to devices that have silvered contacts.   One application is soldering to the ceramic terminal strips used in the old Tektronix scopes.   These were notched ceramic strips that were silver plated in the notches. If you used ordinary solder the molten metal would disolve the silver off of the ceramic.   The silver was quite thin.   The 2% is a saturated solution of silver in tin and lead.    Thus, no more silver can be disolved in the solder solution.   Other devices that use silver contacts are quartz crystals and ultrasonic transducers.
Does anyone out there know of any products using Motorola's Neuron(r) chips MC143150 or MC143120. If so, what are they and are they utilizing Standard Network Variable Types (SNVT)? _________________________________________________________________________________
sehari@iastate.edu (Babak Sehari) writes:  >Similarly, people usually use dB for dBm. Another common mistake is spelling >``db'' instead of ``dB'' as you did in your article. See the ``B'' is for  >``Bell'' company, the mother of AT&T and should be capitalized.  Thus, a deciBell (deci-, l., tenth of + Bell) is a fractional part of the  original Bell.  For example, SouthWestern Bell is a deciBell.  And the measure of current, Amp, is actually named after both the AMP company and the Amphenol company.  Both companies revolutionized electronics by simulatenously realizing that the performance of connectors and sockets  were affected by the amount of current running through the wires.  The Ohmite company was the first to characterize resistances by numbers, thus our use of the Ohms...   Alexander Graham Bell, actually, is where Bell came from...      Actually, Bel refers  >                          With highest regards, >                               Babak   Sehari.  >--
In article <C5uLqG.I5@acsu.buffalo.edu> v064mb9k@ubvmsb.cc.buffalo.edu (NEIL B. GANDLER) writes: > >	How does the radio Electronics free information cards work. >Do they just send you some general information about the companies that >advertise in their magazine or does it also give you sign you up for a >catalog.   It varies. You may get a catalog or price list from the advertiser, or if the ad was a specific product - a slec sheet on that product or line.
In article <C5L0xM.E25@law7.DaytonOH.NCR.COM> jra@law7.DaytonOH.NCR.COM (John Ackermann x 2966) writes:  >My goal is to come up with an inexpensive design for a receiver "back >end" with IF input on one end and an FSK demondulator on the other.  I'm >particularly interested in ways to use a higher IF than 10.7 -- do any >current chips work up to, say 150MHz with internal downconversion so a >normal IF filter can be used? >  GEC/Plessey specify a series of FM demodulators (SL1454 etc) for use in satellite TV receivers : 150 or 600MHz in, 10MHz of baseband video out. I think there's also a related data slicer / clock recovery circuit intended for use in DMAC decoders, though that isn't used in the most common  implementation - it may not be in volume production.  The most easily available components probably vary with local satellite standards, and I think the european systems vary rather widely from those in the US - so it may be worth investigating locally-available receiver designs to find out what's in common use.  -adrian
In article <1993Apr6.092913.18724@sei.cmu.edu> rsd@sei.cmu.edu (Richard S D'Ippolito) writes: > >In article <1pkveuINNduk@gap.caltech.edu>, Joseph Chiu writes: > >> The Ohmite company was the first to characterize resistances by numbers, thus >> our use of the Ohms... > > >Yeah, right.  And the company was started by George Simon Ohmite.
In article <C5v13M.C37@bcstec.ca.boeing.com> 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, you could.  >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.  Well, letsee (whipping out HP-48SX, soon to be GX): 6 inches/3*10^8 m/s=.5 nanoseconds resolution.  Hmm.  That'll be rather difficult!  The more standard (read: better) method is to use ultrasound, generally somewhere around 40kHz.  Sound travels a heck of a lot slower than light (radio waves), and is therefore much easier to deal with.  >What frequencies would be best for this? Or does matter?  It might be easiest to visit a hardware store and look at the numerous "sonic estimator" type devices that do what you want here.  Many are pretty  cheap too -- <$30.  (In fact, for awhile the Stanley Estimator was selling for something like $8.  That's the one I bought! :-) )
In article <1993Apr22.163605.24784@csus.edu> kschang@sfsuvax1.sfsu.edu (Kuo-Sheng (Kasey) Chang) writes:  [byteocide]  > >What I believe the companies should do is implement the above plus >a special patch once the user registers that loudly exclaims upon bootup >"REGISTERED TO XXXXX -- address, city, state zip" and disables the above. >Two benefits: 1) encourages registration, 2) cuts down on pirating and >makes it more traceable, because if the patch's registration message is >encrypted, it will be quite hard to change, and therefore provides a >stable trail of who allowed their copy out of their hands, and thus >violated their license agreement. > You take two copies with a different registration id, compare them byte for  byte and you know where they are located. Usually you will be able to  find out what is what after that.   And what keeps me form registering as John Doe from the company Public  Domain, Yellow Brick Road 1, Tinseltown or something???  > >--Kasey Chang  ------------------------------------------------------------------------------- Guido Klemans  Internet: rcstage1@urc.tue.nl                  valid until 16 may 1993  -------------------------------------------------------------------------------  'Listen very carefully, I will say this only ones.'  Michelle of the resitance
Does anyone know where I can get some voice synthesis chips?? I am looking for something like the ones that do the time and date stamp on answering machines.
In article <1993Apr27.030226.16016@uvm.edu> me170pjd@emba-news.uvm.edu.UUCP (Peter J Demko) writes: >From article <1993Apr27.004240.24401@csi.jpl.nasa.gov>, by eldred@rrunner.jpl.nasa.gov (Dan Eldred): >> In article <1rh9b0INN2r4@snoopy.cis.ufl.edu> ruck@beach.cis.ufl.edu (John Ruckstuhl) writes: >>>I know this is a long shot, but does anyone know what solvent I should  >>>use to clean duct-tape adhesive from carpet? >>>Someone taped wires to the carpet, and now it is time to move out. >>> >> I don't know for sure that this will work, but you might try MEK (methyl >> ethyl keytone?).  It worked getting the stickum left over from shelf paper, >> and is available at paint stores.  Use a carbon gas mask and lots of >> ventilation--this stuff really stinks! >>  >> 	- Dan >>  > >For those who don't know, methyl ethyl ketone is more commonly known  >as ACETONE and can be found as the major active ingredient in >NAIL POLISH REMOVER.  YOUR WIFE'S PROBABLY GOT SOME HANGIN' AROUND....  Oh dear, time for me to try to remember my chemistry.  Let's see if I can find the formulae somewhere in the dim recesses of my mind. <sounds of gears>  <fumes of overheated oil>  <unmistakable stench of the Nasal Chromatograph>   Ha!  I knew there was a double bond!  Now how shall I show that in ASCII?             MEK:                                 Acetone:            C - C - C - C                        C - C - C               #                                    #               O                                    O  The hydrogens are not shown, and # represents double bond.  MEK has a methyl (CH3) on one side, and an ethyl (C2H5) on the other.  Acetone has two methyls.  So acetone is not methyl ethyl ketone, but instead is dimethyl ketone.  Both solvents have similar properties.  I think that MEK may be a little less flammable but a lot worse to breathe. It's a lot harder to buy MEK than it once was.  Use acetone.  Nail polish remover consists almost entirely of acetone.  If you buy some for your workshop, get the very cheapest, because the more expensive kind has oils and perfumes that you don't need.
dplatt@ntg.com (Dave Platt) writes: :  : >What kind of power must he be putting out to cause the effects? : >The affected equipment is about 100 feet from the road... :  : Might be a couple of hundred watts, from the sound of it.  Kicking sound : out of the TV and stereo speakers by direct RF rectification requires a : mighty strong carrier!  [I've heard of linears so powerful that : triggering them while the car was idling, would stall the engine by : pulling down the battery voltage.]  It would take a lot more than that. It sounds like the radio equipment is actually not shut completely off - but just goes to a standby situation.  I suspect that the stories are just that, stories.  The voltage can only be sucked down so far instantaneously. When you try to jumpstart someones  car, when your vehicle is at idle, does your car stall? No, the other car just does not crank well.  Now, the engine might stall because the idle was too low to start with. When the extra current is drawn, the idle speed will drop - as the alternator loads down the engine to compensate for the increased amperage requirement.  : >Is resolution of this problem a matter for the power company, the fcc, or both? :  : Ultimately it's likely to be your problem to resolve, I'm afraid.  The : FCC is so understaffed that they don't pay much attention to citizen : complains about RFI (or so I've heard)... they'll just send you a : pamphlet describing how you can apply corrective measures. :  : Talking to the power company might help - they might be able to install : filtering devices at your service panel (or recommend a type which you : could have installed by a licensed electrician).  A transmitter is not going to be affecting house power. If surges are occurring there, it is due to another cause - not a transmitter.  : Unfortunately, there's a fair chance that enough signal is being picked : up by your house wiring that a simple service-panel filter won't : suffice.  You may need to install heavy-duty RFI filters at the power : connections of your affected equipment.  It is probably not that much of a problem. Often - toroid coils on the power leads will solve that part of the interference problem. It will not solve internal equipment deficiencies.  : If the problem occurs regularly, you may need to "stake out" the street : in question, and watch for trucks or cars with big antennae driving by : at the time interference occurs.  If you can identify the vehicle which : is transmitting, you may be able to contact its owner and complain.  It is probably not the transmitter that is at fault. If the person is an amateur, then he/she will probably be willing to help - if you explain that the person is causing interference.
laird@stable.ecn.purdue.edu (Kyler Laird) writes:  >There is at least one optically-isolated RS-232 transceiver chip.  I >don't remember where I saw it.  RS Components (they exist in Australia and the UK. Don't know about the US) have little chips called Isolated MAX 250 and 251. They give you isolated RS-232 from a single 5V supply. External components are 4 caps, 4 optoisolators, a diode, and an isloting transformer. They go up to 19.2K baud..  John West
I have a MOSFET pulled out of a Trygon power supply, for which I have no  manual.  It's a Motorola part with a 1972 date code and the number  		285-4
Being in the "visualization" stage of a circuit design right now, I was wondering what the best way to "scale" an AC voltage using an 8-bit digital word is. I am thinking of using the common method of sending the word through an ADC and then comparing it with the AC voltage (converted to a sawtooth wave) to get a duty cycle. However, I am leary of this method because it a) requires a lot of parts, and, more importantly, b) creates a lot of interference from the switching on the entire AC line. I realize that correct filtering could cancel out most of this interference, but that would require more parts and boost the price further. 	Someone mentioned to me that they had seen an IC which input 8 bits of data and DIRECTLY scaled the AC voltage coming in all on-chip. Unfortunately, he couldn't remember the chip number or the manufacturer; if anyone else has heard of this chip, please e-mail me. 	I am building this project as a "dimmer box" for a light controller circuit and it is important that the cost of each box remains very low because one dimmer is required for each light that the user wishes to control (well, each channel, at least). Therefor, if each box costs $150, I doubt that an end user will want to dish out ($150 x 16 = $2400) for sixteen channels... This is something I have noticed about today's dimmer boxes; they are so expensive! 	Anyway, any help which someone could offer on either a method of easily doing this or info about the chip which will do it for me (always the preferred method... :) will be greatly appreciated!
Mr MC Howell (g90h6721@hippo.ru.ac.za) wrote: : Please don't ask questions like "why don't you buy a soundblaster".  The : answer is simple "Overpriced considering the sound quality".
In article <adrian.735624685@tasman> adrian@tasman.cc.utas.edu.au (Adrian Lewis) writes: >	Just a quick question.  What standard lab solvents can be used to >clean electronic equipment and components safely (ie not corrode, dissolve, >short-out, etc the equipment)? >	water?	:-) >	methanol? >	CCl4?  You don't say what kind of "electronic equipment" you mean.  It's hard to give a generic answer.  There is essentially no solvent that won't do things like washing lubricant out of switches.  When we've needed to do an emergency cleaning job on things, we've just used distilled water.  The key thing to remember is to make sure the gear is *completely* dry before powering it up again.  We let it dry for several days to be damn sure.  I doubt that methanol has significant advantages over water.  I would be very wary of CCl4, not least because it is dangerous to *you* even if it's not going to harm the equipment -- not only is it poisonous, but I believe it's now known to be carcinogenic.
I am new to this newsgroup so I apologise if this is not the appropriate forum to ask this question. I am looking for the address of Noise Cancellation Technologies. It is rather important. So if you can help me in this regard, please do. Thank you.
I have a Fujitsu M2322K which has been removed (I believe) from a digital X-Ray machine (takes X-Ray pictures without film).  The Fujitsu part number is B03B-4745-B002A.  I have obtained some data on the device, it is 8-inch winchester-type of 168 megabyte capacity (though I was told it was over 800 megabytes). However, there is very little information on the interface standard used. It appears to use two balanced-line connections, but what each connection corresponds to I know not. One connection is a 30-way IDC, the other a 60-way IDC.  If anyone has any information on this device, I would be most grateful if you could provide it.  Thanks.   Chris Powell.
AllMichael CovingtonTelephone on hook/off hok  MC>From: mcovingt@aisun3.ai.uga.edu (Michael Covington) MC>Organization: AI Programs, University of Georgia, Athens MC>Aye, there's the rub -- if you draw enough current to light an LED, th MC>equipment at the phone company will think you've gone off hook. MC>In the on-hook state you're not supposed to draw current.    Ok lets have some calculation here: Going by Australian standards, which I  presume might be similar to other countries ( If not, lets have some  input) a phone uses 600ohm to loop a 48V line = 80mA. A standard LED  drains 20mA. So what is the actual loop current required for an "off hook"  indication, do you know?
One way to make cheap trimmable resistors is to use a high-wattage carbon composition resistor, and saw a notch in it with a triangular file. Of course, you can only increase the resistance, not decrease it.
In article <1r76sbINNkap@flop.ENGR.ORST.EDU> noeler@xanth.CS.ORST.EDU   (Eric Richard Noel) writes: > I hate hard copy manuals, and would rather have all docs online - *not* > because I want to copy the program, but because its usually faster and > and convenient than sifting through an old book I can't find.  Just MHO, but I prefer hardcopy books because you can have three or four   of them open spread across the bed (next to the desk in my dorm) and   reference them while using the program full-screen.  The Windows Help   things come closest to good on-line documentation I've seen, but they   generally aren't detailed enough and would probably take a LARGE amount of   space (even compressed) which is at a premium on my system . . ..  In   fact, the manuals are the primary reason I bought Borland's C++ compiler   instead of using the one the lab licensed (in the lab, of course).  I've   got a SHELF full of books to help me out when I'm stuck.  :-)   To each   his own . . . :-)  >  > Off deeper end-> Why does everyone think they need to be able to make a  > backup copy? Almost all new software must be installed to the hard disk, > so you are left with the originals as your backups. I think its a waste > of time, space, and money, as well as it makes it to tempting to "lend" > out the backups.   We've destroyed about six sets of original Microsoft Word for Mac 5.0 and   Word for Windows (may have been a bad batch of disks).  Don't have the   faintest idea what happened to them, they just went bad.  Weren't stored   near any magnetic fields or otherwise mistreated, indeed they were only   used once.  Given this, and the massive headaches finding a working set of   disks to fix some of the machines that periodically go down, I'd say   having working backups is a godsend.  I sure wish we'd had them (Sometimes   I think Murphy's Law holds true more often than Newton's!!) when we needed   them.  I think it's sortof like snake antivenin.  99.995% of the time you   have absolutely no use for it, but when you need it, BOY do you ever need   it!  I don't have backups of my originals at "home" but then my machine doesn't   see anywhere NEAR the use/abuse of these here at the lab, and so I   consider it less of a risk.  Still, I usually make "working copies" of   them when I install them and then eventually re-use these "working copies"   for something else. . ..   >  >  > No flames intended - just my thoughts.  Just mine, too!  :-)  BTW, before anyone notices my mentioning "copying" programs from machine   to machine when we do installs here and wonders about the licensing, the   upper-management (non-student staff, of course) are METICULOUS in checking   with providers of the software and making SURE we are sticking to the   license agreements . . ..
Power lines and airplanes don't mix. In areas where lines are strung very high, or where a lot of crop dusting takes place, or where there is danger of airplanes flying into the lines, they place these plastic balls on the lines so they are easier to spot.
These circuits abound in most electronic project books.  If you're more inclined to buy something, try Radio Shack.  I think they still have a device that is designed to disconnect an answering machine when an extension line is lifted.  It has LED indicators also.