waashk/20ng huggingface dataset:
In article <C5owvs.pr@world.std.com>, Internet Surfer writes:  > Does any one know if the 6551 is timing/pin compatible with the 6551..   No, the 6551A is able to operate in a 2 MHz system, the 6551 can only take 1 MHz without problems.  If you see a 8551 made by MOS or CSG, take it, its a 6551A.  > 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?  I know no fixed version of the 6551. There are different possibilities to work around this bug. The easiest is to tie _CTS to GND and use _DSR or _DCD as _CTS. It should be easy to fix the software, _DSR is bit 6 and DCD ist bit 5 of the Status Register (Read 6551 with RS1 = low and RS0 = high).  Using the _CTS-line can lead into big trouble. The 6551 _instantly_ stops transmission if _CTS goes high. This means, that you may get only a half byte...  Gerrit
jackp@NETSYS.COM (Jack Powers) writes: >I would like to hook up some cameras that were recently donated to our >local community cable TV station which have sync inputs in the form >of horizontal and vertical drive. Our station sync is a black burst >which works fine with other boxes with "genlock" style inputs. Can >anyone point me at a design, article, or whatever showing how to produce >the horizontal & vertical drive signals?  Check the station's master sync generator.  You'll probably find that it already has horizontal and vertical drive outputs that just aren't being used.  A couple of cables and you're in business.  Another possibility is to find a genlockable sync generator with HD and VD outputs - genlock it to station sync, and then feed HD and VD to the cameras.  If neither of these is possible, then you'll have to build a sync separator.  Look at the circuit diagrams of your existing sync generators - they probably all include circuitry that does what you want.
Hi, Could some kind soul post me the max power/voltage/current ratings of 2SC1096 and 2SA634 transistors, their conductance types and pinouts. They are used in the sweep portion of a TV set. Thanks in advance,
Let me try sending this message again, I botched up the margins the first time; *sorry* 'bout that :)  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)? ________________________________________________________________________
I keep finding these programmers in local junk shops. This may mean that they are indeed junk - but i'd like to hear from anyone  else that may have met up with them. The basic device is a "Data I/O 29A universal programmer", and the usual pod is a  "LogicPak 303A-Vo4" with a "303A-001" programming tester/ adapter. I'd really like to hear from anyone who knows whether these monsters are worth bothering with. All i want to do is blast PALCE22V10s. - Ideas, folks Mike.
I bought this chip from Suncoast Technology and tried to build their dtmf decoder circuit.  But it's not working...  If anyone has the pinouts and possibly the voltage specs I'd sure appreciated it.  If someone could fax, email, or snail mail a copy of the spec sheet for this chip that would be even better. :)  Please email me if you can help.    Thanks in advance, --  Mont Pierce
Attention hardware hackers and bargain seekers!  I just bought a 640x200 pixel LCD panel for 25 UK pounds.  I have a datasheet for a similar panel, but I'm looking for proper data.  If anyone can help with locating data for this device (before I start with the routine on the phone to Hitachi and rummaging through the library), then I'll pass on the source.  	Type: LM225 (Hitachi) 	Resolution: 640W x 200H (so can do 80x25 chars on 8x8 matrix)  Bought from:  	Greenweld Electronics Ltd 	27 Park Rd 	Southampton SO1 3TB, UK  	Tel. +44 703 23 63 63 	Fax. +44 703 23 63 07 	Email: Compuserve [100014,1463]  NB: I only just bought this!  I don't even know if it works!  	Price was 25 UK pounds including VAT (17.5%), which isn't 	payable if you're outside the EC.  Thanks for any info!   Chris
In article <C5nz60.99z@scraps.uucp>, Frank Holden KA3UWW writes:  > >I'm looking for an IC that will convert RS232 voltage levels to TTL voltage  > >levels.  Something relatively inexpensive would be nice, too.  Anyone have > >a suggestion??  Thanks. >  > Well it looks as if Digi-Key sells a chip with the number ICL232 that does what > you want.  They are selling it for about $3.50...  Are you sure that he needs a two way converter? If he wants only RS232->TTL I would suggest the MC1489, its very cheap (0.80 DM in Germany). This chip needs only +5V. The MC1488 TTL->RS232-Converter uses +12V and -12V.  BTW... The MAX232 and compatibles seem to be expensive in the USA... I paid 2.95 DM for a ITS80272 (made by Harris), its absolutely compatible with the MAX232 or the ICL232.  Gerrit
wellison@kuhub.cc.ukans.edu writes:  >I have a project that was drooped in my lap that is somewhat a pain to design. >What I am looking for is a stable ultra-long solid state timer. What they want >to do is to place this thing on the Antartic ice shelf and measure the amount >of snow fall over a period of six weeks. Every two weeks, they want to trip a >selonoid to discharge different colored pellets by gas pressure out across the >snow. Then by digging down into the snow, the snow fall amount can be measured >as they come to the different color pellets.  >The problem is trying to build a timer that would stand the cold (-40 degrees) >and a power source that wouldn't drain. I have looked at the XR-2204 timers and >the standard NE556 dual timers, but thier temp specs won't go that low. Also, >two weeks equates to 1,209,600 seconds per firing, which means one big timing >cap ! I have found 2.2 farad (yes, Farad !) caps that have a working voltage of >5 volts and are small in size.   Why are you fooling around with analog for this job?  A single chip micro and a crystal will do the job reliably and easily.  An 8748 only costs about $5.  That and a $1 crystal and you're in business.  Embed the whole thing in a foam insulated blanket, power it from a solar cell, use the excess power to heat the assembly during the day and rely on the insulation to hold the heat during darkness.  If you don't want to try thermal management, contact someone like ICL and have them cut you a special low temperature crystal.  It'll cost at most $20.  If you use a single chip micro, you're looking at a parts count of  maybe 7.  A processor, a crystal, two caps on the crystal, a power FET to fire the solenoid a flyback diode and a battery.  This is fewer parts than  you can build an analog timer for and is infinitely more reliable.  Add a power zener diode (for heat) and a solar cell and the parts count screams up to 9.  PD assemblers are available for all the common single chip micros.  This application is so trivial you could even look up the op codes in the  programmer's guide and create the binary with a hex editor.  John
kolstad@cae.wisc.edu (Joel Kolstad) writes:  > In article <734953838.AA00510@insane.apana.org.au> peter.m@insane.apana.org.a > > > >If you are going to use one where it counts (eg:aviation, space scuttle,  > >etc) then I suggest you go and buy a Fluke (never seen a Beckman), however  > >for every other use you can buy a cheapie. >  > My Beckman died a few days ago, thanks do about a 4 or 5 foot drop onto a > lab table.  !@#!@$#!@$@#$  Probably not indicative of anything, but I've > already filled out the requisition for a Fluke 87. :-) >  > Oh yeah, and sometimes our measurements here do count.  Not often, but often > enough that I want at least _one_ good meter! > 					---Joel Kolstad     We used to buy Beckman 110 and HD110 ("ruggedized") versions for use by electricians in the steel mill where I work.   After a while we got round to filling all the current-input jacks with silicone - electricians have a regrettable habit of not checking where the last guy left the leads before using a 3 1/2 digit 0.5 % autoranging $400 meter to check if a fuse is good or not. Its very hard on meters (and electricians) when you put the milliamp shunt across a 600 volt bus.    But that's not why we stopped buying Beckmans - after a while a  lot of them got "funny" in the LCD display.  A black stain would spread from one edge, or else they'd come adrift from those Zebra connectors and fail to operate.    Now we buy Flukes, the low-end 20 series mostly ( and we still fill the amp jack with  silicone).    What the world needs is a meter that won't let you change ranges or turn it on/off with a lead stuck in the amps jack - a little bit of clever plastic detailing would take care of this and make the world safer for electricans, anyway.    Not that I've ever put a meter on the wrong range into a live  circuit, no, not me...not more than a dozen times, anyway....     Bill
In article <1993Apr15.044636.29924@slcs.slb.com> dcd@se.houston.geoquest.slb.com (Dan Day) writes: >That's scary -- if there's a way to set an arbitrary mileage figure >into the odometer, you can't trust *any* odometer reading, even >if you can prove that the odometer itself is the same one that >came on the car originally.    I was wondering if anyone can shed any light on just how it is that these electronic odometers remember the total elapsed mileage?  What kind of memory is stable/reliable enough, non-volatile enough and independent enough (of outside battery power) to last say, 10 years or more, in the life of a vehicle?  I'm amazed that anything like this could be expected to work for this length of time (especially in light of all the gizmos I work with that are doing good to work for 2 months without breaking down somehow).  Side question:  how about the legal ramifications of selling a used car with a replaced odometer that starts over at 0 miles, after say 100/200/300K actual miles.  Looks like fraud would be fairly easy - for the price of a new odometer, you can say it has however many miles you want to tell the buyer it has.  Thanks for any insight.
In <1993Apr06.173031.9793@vdoe386.vak12ed.edu> ragee@vdoe386.vak12ed.edu (Randy Agee) writes:  >So, the questions are - >  What do the radar detector detectors actually detect? >  Would additional shielding/grounding/bypassing shield stray RF generated by >  a radar detector, or is the RF actually being emitted by the detector >  antenna? >  Are any brands "quieter" than others?  Ok, so your a HAM.   Well, tune in 10.7Mhz or 455Khz.  These numbers sound  like some you have herd before?   Thats right, you guessed it, they are  common IF numbers.   Every Super-Het receiver has a local oscillator(s) which generates an IF.  This is what your detector detector is detecting (the local oscillator).
In article <C5EJL7.LIn@news2.cis.umn.edu> Mike Diack <mike-d@staff.tc.umn.edu> writes: -In article <C5DGG7.5ox@wang.com> , pvr@wang.com writes: ->   Who sells the special carbide drills used to drill pc boards? ->I am looking for sizes smaller than #60, #65 or #70 would be good.  -best deal i ever saw on carbides was at ELI electronics - Cambridge -Mass. Quite close to MIT, #70 drills @ $5.00 for a box of 50. ELI are -in the Boston fone book.  Actually, I think they are all #57.  Their phone number is 617 547 5005 and I will probably have some over at the MIT Flea this Sunday. /mike
I was wondering if anyone out there in net-land knew of a SIMPLE way to make a 4-band equalizer (single channel).  I need it to accept LINE inputs (tape deck, CD player, etc.) and output to the same! So input impedance should equal output impedance.  Also, since I am driving a line, I would need 1 volt p-p output.  Final requirement is that I can either: 	      1. Control it digitally 			OR 	      2. Control it easily, or with few resistors
In article <montC5qs9A.3wB@netcom.com> mont@netcom.com (Mont Pierce) writes: > >I bought this chip from Suncoast Technology and tried to build their >dtmf decoder circuit.  But it's not working... > >If anyone has the pinouts and possibly the voltage specs I'd sure >appreciated it.    I presume it is the M-8870 from Teltone Corporation.  Pin	Description  1	+ input 2	- input 3	GS (gain select through use of feed back resistor) 4	Vref (reference voltage OUTPUT, about Vdd/2) 5	connect to Vss 6	connect to Vss 7	osc1 clock input 8	osc2 clock output (connect crystal across pins 7 and 8) 9	Vss 10	OE output enable (logic high allows data output) 11	Q1 data output 12	Q2 data output 13	Q3 data output 14	Q4 data output 15	StD Delayed Steering Output (any other company would call this 'data valid'.) 16	ESt Early Steering output, sort of like "I'm starting to hear a tone". 17	St/GT Steering input/guard time output 18	Vdd  Power Supply	: 4.75V min., 5.25V max. Current		: 3.0mA Typ, 7.0mA max.  BUT.......  You really should have bought the Motorola part from me.  :-) (I still have them in stock)  John
I recently ftp'd Al's Circuit Simulator (ACS) and I'm looking for the tutorial which is mentioned in the Users Manual (but not found there). I don't have any experience constructing a netlist (such as for SPICE) and I need a little help.  The examples which come with ACS aren't explanatory about the translation between schematic and netlist. Does anyone have the fabled "Tutorial" or any other reference which could help me in constructing a netlist from a schematic diagram?  (I also emailed Al himself but received no response yet. He's probably  busy with his next release.) --  ------------------------------------------------------------------------------- Tim Pillsbury          Internet:  tsp@ccd.harris.com                           uunet:  uunet!ccd.harris.com!timothy.pillsbury
What are people's opinions about laser detectors?  Escort makes a laser detector, the Passport 1000, and claims it works fine.  However, I've talked to some people who have said that it will only work if you are lucky - i.e. if the cop happens to point his laser at a car in front of you, and the laser beam happens to reflect back to your detector.  Otherwise it won't work.  Regular radar, of course, travels in all directions; hence it is more detectable.  Any comments?  Escort has a deal (till the end of April, I think), where if you buy their wideband (Passport 3200 - X, K, Ka) and laser detectors, you'll save $60 off of buying them separately.  In this case, the addition of the laser detector over the Passport 3200 is only $40 (i.e. Passport 1000 normally costs $100). -- Eddie Gornish University of Illinois - Center for Supercomputing Research & Development
In article <C651xu.Gwq@news.chalmers.se>, d9bertil@dtek.chalmers.se (Bertil Jonell) writes: > In article <1rh22eINNfce@shelley.u.washington.edu> kniha@carson.u.washington.edu (Dagmar Amtmann) writes: > >There is a wire without any jack at the end sticking out of the wall. So you > >need to connect the wires (I'm not sure if they have wall jacks in Western > >Europe - they may). >  >   Son of the Return of the "How much does Americans know about the rest of > the word?"-flamewar anyone?
In article <1rh22eINNfce@shelley.u.washington.edu> kniha@carson.u.washington.edu (Dagmar Amtmann) writes: >There is a wire without any jack at the end sticking out of the wall. So you >need to connect the wires (I'm not sure if they have wall jacks in Western >Europe - they may).    Son of the Return of the "How much does Americans know about the rest of the word?"-flamewar anyone?  -bertil-
>>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   If you are just getting sick of the real estate used by the HCT373, you could always use the approach I have seen one designer take - he stuck the chip in the middle of the EPROM socket, under the EPROM.  Naturally, you have to use an IC socket with the right dimensions, but layout is really easy.
In article <bbuck.735977235@Endor> bbuck@Endor.sim.es.com (Bryce Buck) writes: >Subject: info on flux gate coils/magnetometer? >Keywords: flux gate, magnetometer. >I am interested in finding sources and design information on flux gate coils  >or flux gate magnetometers (digital compass). Please respond via E-mail.  Sorry, my news reader doesn't want to reply.  1) Ling, S.C. "Fluxgate magetometer for Space Application", IEEE Journal  Spacecraft, Vol. 1, No. 2, March-April 1964, pp 175-180.  Oldish, but usable. Background information  2) "Fluxgate magnetometry", Electronics world + Wireless world, September  1991, pp. 726-732.  Great! Circuit diagrams etc for building an electronuc compass
I live in the San Francisco Bay Area, and word has it that something similar is on its way here.  Since we apparently don't have the sensor base you folks have, they're installing cameras at strategic points along the freeways (initial tests are going to be in the Santa Clara area I'm told), with the video being piped into a command center they're building somewhere in the East Bay.  I'm not sure if frame grabbers or cheap labor will be used to interpret the data, but large multi-colored status displays will show the various routes using different colors to represent the various average speeds for each stretch of highway.  An announcer will sit in front of the status 'wall', and will relay continuous verbal traffic status to those who want to receive it.  They're apparently also looking into licensing a low-AM frequency to be dedicated to providing continuous audio from this system.  In the mean time, they'll set up large incandescent display boards along the test stretch to provide commuters with data on traffic conditions up ahead.  My understanding is that the system is subsidized as a pilot program, and information from it will be available free of charge.  Perhaps the LA system is similarly free or provided at an obviously subsidized rate (read "cheap").  We also have the traffic reports that are broadcast on the SAP audio channel of television channels 2 and 36.  These are verbal reports, qualified with a identification tone to tell in-vehicle receivers like the 'Auto Talk' that the information coming next is applicable to a given area.  In LA, they're probably using some other TV channels, but the concept is the same.  Try setting your stereo TV or VCR to receive the SAP audio channel, and go station jumping to find out which one is broadcasting this information. I believe this program is also subsidized, making the in-vehicle receivers cheap to purchase (and without having to incur monthly fees to use it).  Since the makers of these in-vehicle receivers don't have to pay for the broadcast (this may not be completely true), they likely have no investment in keeping the system up and running when the Cal Trans stuff hits the airwaves.  You may have a nifty little TV audio receiver in your car, nothing more, when this happens.  Perhaps a word to the wise...?  ;)  I think we'd all be interested in a summary post if you get more info on how the LA system is networked and paid for.
In article <1r1996INNijp@hp-col.col.hp.com> johnr@col.hp.com (John T. Rasper) writes: >Does anyone know the details of the interface (5 wire din) for the >IR remote sensor & (2 wire IR repeater) for the ADCOM GTP-500II >preamp?  The ADCOM part numbers are the XR-500II, SPM-500II, and  >IRA-500II. > >A cursory physical examination of the pre-amp connector indicates >that the connector (5 pin din) may provide: (Viewed from connector front) > >      | >   5     1     (pin ?) +?v @ ???mA >    4   2      (pin ?) +/-?v @ ???mA >      3        (pin 3) Signal Ground >               (pin ?) Demodulated signal ?V-pp, ? polarity, ? mA drive >               (pin ?) Signal to drive repeater LED (drives through 150ohm >                       resistor) ?V-pp > >I assume that the repeater connectors (mini-plugs) drive the IR repeater >LED's directly.  True? > >Can anyone fill in the ?'s.  Thanks. >  Here's the scoop.  When you get your home brew receiver working, would you be willing to share it with the rest of us?  I always wanted to build my own but never have the time to fool around and design it.  pin 1:  signal ground pin 2:  signal pin 3:  always hot +6 volts pin 4:  +6 volts, hot only when preamp is turned on pin 5:  infrared repeater connectors  The infrared repeater jacks on the back of the preamp are not connected to anything inside the preamp except the 5 pin connector pin #5.  There is a 150 ohm resistor between the two jacks, with a 1.5K from pin 5 to ground.  The signal pin #2 in the preamp is summed with the built in IR receiver. They use a chip called CX20106A and a BJT to amplify the signal.  I would imagine the logical way would be to duplicate this circuit and use it as the external receiver.  If you need more info, let me know.
In article <1993Apr17.211126.23467@norfolk.vak12ed.edu> fculpepp@norfolk.vak12ed.edu (Fred W. Culpepper) writes: >I am making a search for a CAD program that does a decent job >of making schematic drawings.  The program needs to be in >MS-DOS, Windows if possible. > >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). >It also needs to have provision for adding legends to the >components as well as their values.  In other words I want to >produce quality drawings.  Printout would be to either 24 pin >dot-matrix and/or Laser Printer.  I would suggest Draw for Windows (by Micrografx).  I have this on my home box.  Its quite impressive and only cost UKL100.  It has a rather nice clip-art library facility which you can expand with your own drawings.  There is no circuit component clip-art included, but you could add your own quite easily.  It works with any Windows printer driver of course, and can also export embedded postscript and PCX files.  Note: I am not connected with Micrografx in any way.  Paul.
butts@shocker.ee.twsu.edu (Ronald W. Butts, Jr.) writes:  >I am looking for suppliers of 900MHz spread spectrum radio modules. I need  >to implement a two-way audio band link (essentially the guts of a cordless  >900MHz phone is what I want.)
In article <1993Apr26.045628.5617@hpcvaac.cv.hp.com> billn@hpcvaac.cv.hp.com (bill nelson) writes: >brian@ucsd.edu (Brian Kantor) writes: > >: Listen to the interference.  If you hear voices clearly, it almost >: certainly ISN'T ham radio, and might well be CB.  If you can record a >: bit of it, you could take the tape over to a local ham operator's house >: and ask him for his opinion of what you're hearing.  Most communities > >You cannot do that legally.   Why can't he record it legally?  It may not be admissable in court, but recording for personal use is legal.  If he wants to play it for his ham friend, that's legal too, as long as he doesn't charge admission.  >Unfortunately, most consumer equipment is succeptable - it is all poorly >designed.  Here, Here! > >: (BTW: hams are ALLOWED amplifiers; CB isn't.  "illegal ham amplifier" >: doesn't compute.) > >It does, but not for a mobile radio. There are very few mobile rigs that >could power a 1500 watt amplifier. >Bill  It doesn't actually have to be 1500 watts at 100 feet.  I've heard radio transmissions from concert security over guitar amps with no guitar plugged in, and security uses radios transmitting 2-5 watts into a rubber duck antenna, which acts more like a dummy load than an antenna.  Hey Bill, where were you three weeks ago when all this stuff was posted and dealt with?
In article <1993Apr26.165902.239@uvm.edu> me170pjd@emba-news.uvm.edu.UUCP   (Peter J Demko) writes: > From article <1993Apr25.201129.1239@Princeton.EDU>, by   fuchs@tsar.princeton.edu (Ira H. Fuchs): > > Is there a readily available solvent that does a good job at removing   the   > > corrosion/encrustation that collects on the battery terminals (usually   the   > > cathode) when using alkaline batteries (or more accurately, when NOT   using   > > them for a long time)?  >  generally,  the corrosion is a signal that it's time to send them >  of to the recyclers, but if you're that desperate or cheap try  > baking soda and a wire brush. use gloves and goggles, please!