waashk/20ng huggingface dataset:
I was a bit surprised that the manual for my Fluke-87 multimeter suggests applying WD-40 to the test lead sockets, especially the current range socket.  The intention is to prevent the test-lead-is-in-the-wrong-scocket beeper from going off when there is no test lead in that socket.  The manual is a bit vague, but I think I'd apply the WD-40 to a swab, then wipe the socket instead of spaying the stuff directly from the can.  Speaking of said meters:  I compared the 87 against the 8060A that I've had on my bench for almost 11 years.  It has been five years since the 8060A has been calibrated.  On the DC scale, they agree within .01 mV.  AC scale is within about .1 mV.  The 87 would be just about the perfect portable meter if it had the dB scale; I didn't feel it was worth the extra $100 for a second 8060 since I don't use dB all that much in my work.
neal@cmptrc.lonestar.org (Neal Howard) writes:  >The concrete floor accelerates the problem because it is a heat sink and a >colder lead-acid battery self-discharges at a slightly faster rate. That's >why the old wives' tale of sitting it on a piece of wood on the floor works >to help keep from killing the battery as fast ---- it insulates the battery >thermally. It you'll set the battery down on a piece of styrofoam, it will >self-discharge even slower.  There are a number of inaccuracies here: 1) In fact, a colder battery will self-discharge more slowly.  This is why    batteries should be stored in a COOL, dry place. 2) An battery placed on concrete does not become colder than one placed    on wood.  The battery, the wood, and the concrete will all be at the    same general temperature (ignoring temperature fluctuations) and thus    none will effect the other.  >The best thing would be to attach a small load >such as a small transistor radio with the volume turned down low and leave it >on constantly, but also trickle-charge it every couple days too to "shallow- >cycle" the charge in the battery. Such mild "exercising" of a lead-acid >battery is the next best thing to completely removing the electrolyte for >storage.  There is no need to 'exercise' the battery.  Just keep it charged.  (A trickle charger will do the job.)
There are also a couple or three places on West 45th between Fifth and Sixth.    Harvey   --
>>What I want the CAD program to do is to draw diagrams by >>dragging elements onto the screen, and in this the elements >>needed are as diverse as vacuum tubes to ICs (case with pins). .. try DraftChoice, its not windows but its shareware and object oriented. Use it with PrintGL for high quality output.
>Off-shore assembly is one reason that Adcom is able to make products  >that perform as well as those from people like Audio Research and Van  >Alstine (and better than Hafler and Forte'), but at a much lower cost.   How do you spell "tuna helper" ?
In article <7480237@hpfcso.FC.HP.COM> myers@hpfcso.FC.HP.COM (Bob Myers) writes: >> 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 >> maximum rate the TV was even capable of displaying images was 1/30th >> of a second.  (or 1/60th of a second for an image composed of only odd >> or even scan lines) > >You are correct; the fastest "complete" image that could be presented on >TV would be one field, which is 1/60 of a second (approximately).  Of course, >the phrase "TV screen" is often thrown around in reference to any CRT >display, so perhaps this researcher wasn't using normal TV rates.  Might >even be a vector ("strokewriter") display, in which case the lower limit >on image time is anyone's guess (and is probably phosphor-persistence limited).
Andy Collins (acollins@uclink.berkeley.edu) wrote: : One not-so-quick question to throw out there for you guys...  : For our class project, we need to design and build a power supply : to the following specs:  : Voltatge:  adjustable from 1-12V : Current:   *limited* at 1A  : Voltage must stay within 2% of designated value for I from 0-1A : AC ripple less than 5 mV (rms)  To decide which kind of circuit you must know the initialprecission of the limiter-current and the allowed temp-drift.  In the first case, you can use a Ube of a transistor as a voltage-reference of about 0.7 VDC with a temp-drift of 2mV/K. In the second case its better you use a bandgap-ref and a opamp-circuit to detect the maximum-current. The output of this opamp controlls the outputstage to limit the current.
In article <wb9omc.735430855@dynamo.ecn.purdue.edu>, wb9omc@dynamo.ecn.purdue.edu (Duane P Mantick) writes...  >	BTW, I have seen IRLEDs with outputs up to 6 watts...honest, >6 WATTS.  I don't have the book here at work so I can't recall the company >name.  The 6 watter ain't cheap, around $108 but if you want some power, >mamamia, that's pretty hot.  They also have a 4 watt, a 2 watt and a >1 watt device in their line, and will sell small quan. to individuals. >If you are interested, I can find the book at home and get the >pertinent info. >   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.
Just to complete that thought, the cooling towers cool water that circulates through heat exchangers that recondense the turbine exhaust back into feedwater for the heat exchangers that transfer energy from the reactor's cooling circuit.     |---------------|   |------turbine, etc---|  |---------|   |                >   >                    >   >        . reactor            <   <                    <   >        .   |                >   >                    >   >        C. T.   |---------------|    |--------------------|  |----------  The reactor has a closed loop circuit to prevent radioactive contamination of the the turbine feedwater.  The cooling tower is a separate circuit to avoide contamination of the turbine feedwater with atmospheric contamininats, etc. Purifying boiler feedwater is important business at both fossil fired and nuclear generation facilities.
Does any one know if the 6551 is timing/pin compatible with the 6551..  It seems the 6551 has in iheirent bug with cts/rts handshaking and i need a suitable pin replacement to put in my serial card... possibly a buffered version perhaps?
In article <PASCAL.93Apr1160623@ap10.apd.cpg.sony.co.jp> pascal@apd.cpg.sony.co.jp (Pascal Goguey) writes: >In article <7376@blue.cis.pitt.edu> macfitz+@pitt.edu (Mark D Fitzsimmos) writes:  > *After a considerable amount of research, review of discussions  > *on this group, and mainly fruitless time on breadboards, I have  > *decided that the path of least resistance for prototyping my (not  > *necessarily someone else's) electronic designs is wire wrapping.    >	I have no idea about what you want to do, but be careful : >Wire wrapping increases a lot the wiring capacitance. That shouldn't >be a problem for "slow" applications (i.e a few MHz), but as for >quicker ones (around 30 / 40 MHz), I doubt that it can work.   	Fortunately, wire-wrapping is a better wiring technique than most at high frequencies; Cray computers (up to the X-MP, at least) all had wirewrapped backplanes.  Wirewrap gets into trouble at much higher frequencies than any TTL can handle.  The 'increase' of wiring capacitance is not really relevant (you have to use transmission line techniques, and the capacitance is no problem).  > *1) Where can I get a decent wrapping tool?  I'd like to spend less  > *than $150 for an AC powered unit including bit and sleeve.  >	Hand powered is the best. There are good AC powered ones, >but rather expensive. A low-cost one doesn't work very well.  	Hand-powered is a terrible choice (IMHO) unless you are a field maintenance person who will do maybe a dozen connections at a time.  Your hands will cramp.  Battery-powered wire-wrap guns are available in the $150 range, and so are the little twiddle-stick manual types ($15).  For a modest project, of a couple hundred connections, I'd prefer to borrow a professional AC unit... or a pneumatic one.
ulan@ee.ualberta.ca (Dale Ulan) writes: >kuusama@kaarne.cs.tut.fi (Kuusama Juha,,,VTT,) writes: >>Not that the question is anything important, but I am still curious: >>Why is that almost all printed circuit boards are green? I have seen >>a few blue ones, but no red, yellow, company logo etc. Is there a >>technical reason or could it be that the marketing "geniuses" have >>not tought about it (yet)?         It's possible to make boards in other colors, and I have an ad for laser light-show equipment which offers the circuit boards in your choice of Day-Glo (tm) colors.         The usual light green color is just the natural color of Fiberglas. The dark green or blue is the solder mask layer, and I suspect that color is a dye.
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
marrevola@rediris.es wrote: : In article <1993Apr6.132429.16154@bnr.ca>, moffatt@bnr.ca (John Thomson) writes: : > Joseph Chiu (josephc@cco.caltech.edu) wrote: : >  : > : 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. : >  : > Sorry.  The unit for current is the AMPERE which is the name of a french-man : > named AMPERE who studied electrical current.  The term AMP is just an abbreviation : > of it.  The company AMP came after the AMPERE unit was already in use. : >    : > : The Ohmite company was the first to characterize resistances by numbers, thus : > : our use of the Ohms... : >  : > I don't know about this one, but it doesn't sound right. : Are you (two) joking? : Is the entire Internet flaming you (two)? : Ahh!, now I remember that Ohmite company was the first introducing "the pink : colored resistor", only for electronics working females ;-) : --  : Manuel Arrevola Velasco   ||||| True e-mail: manolo@taf.fundesco.es ||||| : DoD #1033 :  Yes, I have taken a bit of flame on this one.  I must've been half asleep when I posted a response to Joseph.  Greggo.
In article <C5yqDE.Cq0@ecf.toronto.edu> gladman@ecf.toronto.edu (GLADMAN AVIV) writes: >That's why you >don't find blue LEDs or, for that matter, some other colour of LEDs. That >is not to say that blue LEDs can't be found.  I've seen 'blue' LEDs sold, >but they were just your typical visible light LED in a blue plastic covering.  No.  The blue LEDs sold down the street are in milky-white plastic.    And, fyi, putting a filter on a "typical visible light LED" (presumably meaning a non-blue one) won't produce blue light.  A filter can only block light, it can't generate wavelengths that aren't there to start with.
In article <1993Apr27.010612.17126@chpc.utexas.edu> michael@chpc.utexas.edu writes:  > >Does this imply the German tone dialing is compatible with the American >one?  I know at least the British system is not -- it is supposedly close >enough though that an American phone will work.  But my modem (American) >has a special setting for British standards... >  Bzzzzzt! Wrong answer.  The UK tone dialling is identical to the US system.  The different settings on your modem are so that it uses CCITT V21 & V22  tones for data transmission, rather than Bell 103 & Bell 121 tones, which are  used only in the USA and canada AFAIK.  As most people now use at least  V22bis, this is largely irrelevant.  Tony
In article <1993Apr26.012517.23391@Princeton.EDU> jsm@shade.Princeton.EDU (John Scott McCauley Jr.) writes: >I recently took apart my color Sony TV to clean the volume pushbuttons and >when I put the beast back together, the flyback whine got much louder. > >Is this easy to fix? Which part is resonating? I have heard rumors of a >spray that will fix the noise.  Is this a simple thing for a TV repairman >to fix? > >	Thanks, > >		Scott  Ah-ha!  I'm not alone at last!  Which Sony do you have??  I have a 27"SXR (pre-XBR series, circa 1987).  That damn thing used to make noise like a mad-man.  I had/have 2 separate problems...one being the flyback, the other was the assembly where the windings of the yoke came together.   First:  I found by poking around the windings on that assembly, the thing would make noise.  I guess that there was enough of a potential in that assembly to leak, so I sprayed it with a dielectric insulation spray--I think it was urethane or acyrilic.  That fixed it.  Second:  Flyback...for the life of me, I can't isolate this one.  If I leave the cover off, the TV will be quiet.  If I put the cover back on, and let it heat up, it'll start to whine--kinda hard to solve with the cover on!! :-(  A friend of mine who used to fix TV's says there might be a pin-hole leak somewhere on the flyback.  Usually it's surrounded by a bunch of black dust/dirt.  I hope this is a start...if you find something out, let me know!
In article <1r847f$kp7@uniwa.uwa.edu.au> john@gu.uwa.edu.au (John West) writes: >ifarqhar@laurel.ocs.mq.edu.au (Ian Farquhar) writes: >>Wrong, it has a 6507.  >For those who would like to know, the 6507 was a 6502 without IRQ or NMI, >and with only 13 address lines (giving 8K memory space).  Yes, but still not a 6502 for those differences.  Same instruction set, of course.  >>It had one custom chip (not an ASIC in the sense that word is now understood): >>the TIA (sometimes known as the 6526, although most other manufacturers list >>that as the CIA complex interface adapter.)  TIA stands for Television >>Interface Adapter, and it handles sound, paddles and the minimal video hardware >>the 2600 possessed.  >Didn't know about it being called the 6526 - thats the CIA found in the >Commodore 64 (I don't believe this chip existed when the 2600 was around).  Yes, the same number, but an entirely different device.  I should have qualified this further by stating that this was the PAL version of the TIA - I am not 100% sure that the NTSC TIA would have a different number.  >The TIA was mapped into the bottom 128 bytes of page 0, and shadowed in the >bottom 128 bytes of page 1. To get an image on the screen, you had to wait >until the raster line your picture started at, load bitmaps for this line >into the 'sprite' registers, tell them what x positions to take, how many >duplicates you wanted, etc, then do it all again for the next line. This >took all of the processor's time during the visible portion of the >display.  Does anyone on the net actually have details of the TIA, as this is the only device I have not yet discovered details about?  Atari Australia, when asked, claimed that their attempts to get the programmers documentation for the 2600 had failed, as the US head office had refused to provide it.  >to chip selects. The 6507 likes to have ROM right at the top of memory, so >the 2600 had to use ROMs with active high chip selects - not exactly >normal, so some cartriges had a 7404 in them to convert this to the more >usual active low chip select.  I saw a couple of cheaper devices with PN2222's and a couple of resistors hooked up as a cheap inverter.  Nasty, but workable, and cheaper than a 7404 inverter if labor costs almost nothing.
Hi folks,  I borrowed a VHS tape from a friend and it has a warning in the begining saying that attempts to copy the tape will result in destroying the copy and the original. I found this unbelievable as playing and recording are two different processes. However, I've never seen this tape being sold anywhere so I don't  want to take the chance even it's small.  Anyone has experience in this kind of self-destructing video tapes?  Thanks in advance.
I had a catalog with membrane keypads, but I dunno what happened to it, and it was so long ago that I forget the name of the company.  Anyway, you could make your own legend and slip it behind the bezel.  Really nice and  reasonably priced.  Can anyone tell me where to get some more of these critters?  I've tried several places, but none of them seem to have keypads which allow you to use your own legend.  Any suggestion would be appreciated.
>>In article <1qg98sINNokf@sheoak.ucnv.edu.au> jeff@redgum.ucnv.edu.au (j. pethybridge) writes: >>>	Hello again, >>> I asked this a year ago, but i am still looking. >>> I am getting sick of having to use a HC373   I didn't catch your posting one year ago, but I presume you like to leave out an extra a-latch ? (I presume you allready know there is a '573 but that couldnt be the question, could it ? ;-)  During my student-trainee project, I discouvered a nice device, it's a PSD301   from Waferscale Integration. In one single (44 PLCC I think it was) package it contained: ROM, RAM, I/O lines and a programmable addressdecoder...  As far as I can recall, it can be hooked directly with a MCS-51 series uP ...  Neat huh ? But it needs programming before assembly, so it wasn't suitable for my project. Perhaps usefull for you (future) plans ?
From article <qekN3B4w165w@sys6626.bison.mb.ca>, by baden@sys6626.bison.mb.ca (baden de bari): > erickson@azure.nmt.edu (Alan Erickson) writes: >  >> 	I'm trying to bring in 8+ bits to a PC, and would like >> 	to use interrupt-driven routines. Without buying an IO >> 	board or making a new port, _where_ can I bring in these >> 	bits? LPT seems to have only a few inputs, but I've heard >> 	rumours that some LPTs have bidirectional lines. Anybody >> 	know fer sure? If any bi-d LPTs, which boards have them >> 	(I'll be running a new 386DX-33)? >  >   >         Yes, it is possible.  I'm making a 7 stepper controller board,  > with 7 digital inputs, and (up to) 18 digital outputs from the // port. >    One main thing that will tell you whether the // port is  > bi-directional or not is the bus tranceiver on it.  Look for a chip  > numbered 74LS245.  If you don't have this, then it's probably a 74LS244,  > which will do you NO good for reading in. >    >           Now, if you do have the '245 then do the following: >   First, find the address of the port, (decimal) either 888, or 632. >   In pascal, you would "Write(Port[xxx]);" where xxx is the address in  > either hex or decimal.  The status lines, pins 14, 16, 17, as well as the  > strobe, pin 1, are bi-directional lines, and are read by base address +2,  > so for 888, to read from status, then read from 890.  You can also output  > to these lines in the same fashion as to the data lines.  In pascal,  > do "Port[xxx]:=value > ". >   >                 Hope this helps. >         Let me know if you need more help. >   >   >   _________________________________________________ >   Inspiration  |   ___                             | >   comes to     |  \   o  baden@sys6626.bison.mb.ca | >   those who    | (  ^  ) baden@inqmind.bison.mb.ca | >   seek the     |   /-\      =] Baden de Bari [=    | >   unknown.     |                                   | >   -------------------------------------------------  >
In article <1993Apr21.204556.21262@cronkite.ocis.temple.edu> camter28@astro.ocis.temple.edu (Carter Ames) writes: > >   I was just wondering one thing, actually two. ( I hope that this is the >proper place to post this subject) > >  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. > >thanks >camter28@astro.ocis.temple.edu  I am not a battery expert, but from recent reading, a lead acid battery will self discharge at a relatively high rate, and if stored in a discharged state, will develop a condition I think is called sulfation.  In storage, either the electrolyte should be removed and replaced for use (fat chance I'd ever do that at home), or the battery should be stored on a trickle charge.  I have also (I think) read that the condition may be reversable if hooked up to a current limited charging circuit fro a LONG period of time. The refernce I remember is to use C/50 (where C is the amp hours) as the charging circuit, and leave it hooked up for weeks.  Some of this may only apply to Gel type cells, but I suspect the same applies to the liquid type.
In article 15495@walter.bellcore.com,  deaddio@ski.bellcore.com (Michael DeAddio) writes: >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  I am not sure about this, but I believe that Analog Devices in Norwood, MA makes a relatively inexpensive acceleration sensor (primarily for use in auto air-bag systems). I do not know specs or anything else, but you might give them a call to find out more info.  								Z   --  ------------------------------------------------------------------------- | Syed Zaeem Hosain          P. O. Box 610097            (408) 441-7021 | | Z Consulting Group        San Jose, CA 95161             szh@zcon.com |
There is a file at the simtel archives called adda10.zip I think that is for DSP.
I would like to get some information on the current systems used for HD-TV sound systems.thanks.
>>The same folks now have out LBL (Little Big Lan) for $75.  I think you >>get it for $50 if you already own $25 Network.  LBL works with Arcnet, >>parallel ports, and serial ports in any combination for up to 250 or so >>nodes.  No flames please, but I picked up this discussion a bit late and I  am really curious...  What exactly *is* the $25 network? Something to hack together N serial cables? Something with N serial drivers?
AllTall Cool OneWhat's a good IC for RS23  TC>From: rky57514@uxa.cso.uiuc.edu (Tall Cool One ) TC>Organization: University of Illinois at Urbana TC>I'm looking for an IC that will convert RS232 voltage levels to TTL vo TC>levels.  Something relatively inexpensive would be nice, too.  Anyone  TC>a suggestion??  Thanks.  Try a Maxim "MAX232CPE" 8 pin dil, converts 5V to 12V for 232commms. What a clever little gizmo!
Does anyone have recommendations on whether a smart data I/O (print spooler, digital sampling, etc.) would be better implemented with a DMA chip or a dedicated microcontroller?  Essentially what I am trying to decide is the best way to handle moving data from a port with automatic handshaking from or to a memory area that will be accessible by a main system processor when not in use by the smart data I/O.   Which DMA or microcontroller chip would be best to use?  Fast, cheap, and easy to obtain would be nice, but I won't limit my choices to only those that fit those characteristics.  Even an 8086/8088 (under $5) would do what I want, but I am sure there is a better alternative -- like a microcontroller with onchip (E)EPROM.   So I essentially want to hear about all DMA and microcontrollers that are simple to interface and will move data from one place to another while monitoring a few I/O lines.