HDTenEightyP/NetNews huggingface dataset:
From: amaranth@vela.acs.oakland.edu (Paul Amaranth)
Subject: Looking for X based schematic program
Organization: Oakland University, Rochester MI.
Date: Fri, 22 Jan 1993 16:18:30 GMT


Anyone know of any freely available X or Motif based schematic drawing 
programs available on the net?

Thanks
-- 
Paul Amaranth  Manager User Services - office: (313) 370 4541 (also voicemail)
(internet)     amaranth@vela.acs.oakland.edu  |    This space 
(bitnet)       amaranth@oakland               |    temporarily
(uucp)         ...!uunet!umich!vela!amaranth  |      empty
Newsgroups: sci.electronics
From: navy@iastate.edu (Scott V Rivera)
Subject: RS-232 Pinout help
Organization: Iowa State University, Ames IA
Date: Thu, 21 Jan 1993 20:32:53 GMT

I am designing a circuit which sends 8-bit numbers to a PC via
a RS-232 connection.  Can anyone supply me with the pinouts for
a standard interface.

Also, if anyone knows of any useful programming code...
pascal, C, assembler, or Fortran all OK.

Thanks in advance

Scott Rivera
navy@iastate.edu
PrISUm Solar Car Project
Iowa State University

Newsgroups: sci.electronics
From: danube@max.physics.sunysb.edu
Subject: Starting a mercury lamp
Organization: Institute for the Theoretical Physics
Date: Tue, 26 Jan 1993 02:10:09 GMT

   Hello again.  More problems with my current research.  I need a UV
source.  I have a used Mercury lamp, said 250W before I took the envelope
off.  Inside is a quartz tube with two electrodes sticking into each
end and Hg blobs on the sides of the tube.  There is no filament between
the electrodes in the ends as in the ususal flourescent bulbs.
   On one end, the two electrodes are connected to the AC via a 15K (?)
resistor, i.e. hooked up like a little glow lamp with a current limiting
resistor.  The other end is simply connected to the AC, through what
was a filament of some sort before I evaporated it.  See the diagram
below.
    My question is, how is this lamp supposed to work and how can I
get it going without blowing fuses?  


 -------------------------------------------------------------------------|
    |           |                                                         |
    |           /                                           "filament"--> )
 110 V          \ R         --------------------------------------        (
   A.C.         /         |                                      |        )
                \         |                                      |        (
    |            |________|____                              ____|___ nc  |
    |                     |                                      |        |
 ---------------------====|====           Hg vapor           ====|====----|
                          |                                      |
                          |                                      |
                           -------------------------------------- 
                                      Quartz tube


   I've tried replacing the "filament" with two 100 W bulbs to limit 
current, but cannot get the lamp to go on reliably and it probably also
limits the useful power.  Is one supposed to use a ballast in series with
this type of lamp?
   Thanks in advance for your reply.
							Danube
From: sreeb@crash.cts.com (Ed Beers)
Newsgroups: sci.electronics
Subject: need magic key strokes for Sharp sf-760 copier.
Date: 25 Jan 93 09:24:35 GMT
Distribution: usa
Organization: CTS Network Services (crash, ctsnet), El Cajon, CA

The Sharp sf-760 copier can be adjusted by pushing combinations
of buttons in sequences that Sharp doesn't supply to end
users.  In particular, I need to know the meaning of an "L1" 
error code and how to clear it.  I'd like to get a list of 
all the magic key codes and error codes.  Please email me if 
you have the info or know where to get it.  I'd also like a
service manual.  My dealer seems to think he can make more 
money by keeping me as ignorant as possible.  Any help will
be appreciated.
From: nagle@netcom.com (John Nagle)
Newsgroups: sci.electronics
Subject: Re: DC to AC on large scale???
Date: 25 Jan 93 19:09:27 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes:
>> The fact that we are 50Hz and France is 60Hz might be observed too. :)
>Except that France isn't. It's 220v 50Hz, like most (all?) of Europe.

      Power line frequency conversion stations are rare.  There's a big one
at Broken Hill, Australia, because the mines run on 40Hz (!).  For most of
a century, Broken Hill was electrically isolated, but a few years back,
the power grid finally reached there, requiring a frequency conversion.
Very messy.  Big resonance problems.  The mine has huge, intermittent loads
with bad power factors.  All solid-state, though; it's not done with
rotating machinery.

					John Nagle
From: aj008@cleveland.Freenet.Edu (Aaron M. Barnes)
Newsgroups: sci.electronics
Subject: WANTED:Non functioning Mitsumi Elec 5 1/4 half height drive
Date: 24 Jan 1993 06:08:24 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc4.ins.cwru.edu


Subject says it all.Please drop me a line if you can help me out.
Thank You.
-- 
Aaron
aj008@cleveland.freenet.edu
Place for Ted Kennedy in Clinton administration? Head of Departme
nt of Transportation roads and BRIDGES division,of course!
From: barryf@hpfcso.FC.HP.COM (Barry Fowler)
Date: Tue, 19 Jan 1993 17:38:41 GMT
Subject: Re: Heathkit
Organization: HP Colorado Computer Mfg. Operation
Newsgroups: sci.electronics

Try information for Benton Harbor, Michigan.


Xref: sparky sci.electronics:23313 alt.radio.pirate:800
From: alexpace@ccwf.cc.utexas.edu (Alex L. Pace)
Newsgroups: sci.electronics,alt.radio.pirate
Subject: Arizona Case (Was: Re: FM power calculations needed)
Date: 25 Jan 1993 04:52:52 GMT
Organization: The University of Texas at Austin
NNTP-Posting-Host: foghorn.cc.utexas.edu


I find it fascinating that intrastate FM transmissions were deemed legal
for non-commercial use in the arizona case. I wonder if other rules
applying to the number of PSAs and language apply?  I suppose you would be
better off if you didnt draw attention to yourself by using foul language
but if the FCC doesnt regulate intrastate...

BTW how much would it cost for a setup with a 2 mile broadcast radius???
I assume all you would need is a transmitter and an antennae...would a
regular TV/Radio antennae from Radio Shack work?

alex
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Dumb/simple UART chips
Date: 28 Jan 1993 06:47:29 GMT
Organization: University of Washington, Seattle
Distribution: world
NNTP-Posting-Host: carson.u.washington.edu

In article <1k55dkINNe5b@digex.digex.com> bote@access.digex.com (John Boteler) writes:

>Is there a dumb UART readily available?

	Don't you really mean easy-to-use, or simple?  Why do you
CARE whether it's dumb or not?

>I am designing a box that sends out serial telemetry based on 8 switches
>being ON or OFF. A serial interface looks like a good way to do it. I
>don't need interrupts, I don't need FIFOs, I don't need modem status
>bits, I don't need none of that stuff.

>I would rather not bump the level of complexity up several notches by
>requiring a microcontroller (and its firmware) just to initialize the
>UART speed and so forth. Is there a really dumb UART that can come up in
>a known state and just shovel data?

	No.  The dumb ones don't have internal clocks, and telling them
when to send and when to shut up is slightly problematic.  The smart
ones require a CPU.

	I'd consider a Z8671 for this.  It's a Z8 microprocessor
with a dozen or so I/O lines, which powers up with two of the lines
configured for serial in/out at (I think) 2400 baud.  You send
it a command in tiny BASIC, and it reads you the input values.
Last time I looked, it's $15 or so, and needs only a crystal,
two small capacitors, and the RS-232 translation circuitry.
I think it takes 7.3728 MHz, but I'm not sure.

	There's no need to make a big project out of using
a microprocessor.  The entry level is pretty painless.

	John Whitmore
From: srgxnbs@grace.cri.nz
Newsgroups: sci.electronics
Subject: RE: Counter
Date: Thu, 28 Jan 93 02:52:52 GMT
Organization: Industrial Research Ltd., New Zealand.
NNTP-Posting-Host: grv.grace.cri.nz

>From: flux@sys6626.bison.mb.ca (John Kamchen)
>Subj: Counter
>Date: 27 Jan 93 07:07:13 GMT
>
>I'm using a great chip from Avesem, a Video Genlock PLL chip, and I need
>to design a counter that counts to 1818, then resets back to zero (with 
>some kinda \RCO when it hits 1818).
>I've looked through all my TTL data books, and nothing really strikes me
>as being 'right' for this application.
>The input clock pulse is 28mhz, so that rules out CMOS parts.
>Any ideas?  I've got two kick-ass projects I can use this chip in, and
>I can't do anything untill I figure out a counter.
> 
>-John
>SSE BBS (204)589-1078 v32bis AmiTronics- MEGS of 'em

isn't there a standard TTL/LSTTL divide by 12 counter comprising a
/2 and /6 stages? If so use the /6 stage to reduce your 28MHz to 4.667 
MHz
and then use a CMOS counter suitably decoded to divide by 303 ...?
Bruce
Newsgroups: sci.electronics
From: dbc@tc.fluke.COM (Dan Carson)
Subject: Re: 110V -> 220/240Vconversion for appliances
Keywords: Voltage conversion
Organization: John Fluke Mfg. Co., Inc., Everett, WA
Date: Tue, 26 Jan 1993 17:31:42 GMT

In article <7263@m1.cs.man.ac.uk> apm@kaa.ee.umist.ac.uk (Paul Marriott) writes:
>I am shortly moving to Canada and have quite a bit of UK electrical
>equipment to take. Obviously, this is rated at 240V, 50Hz. Whats the
>deal with transformers to convert 110->240? What sort of power ratings
>are available? Enough to power a 3KW kettle? Or is it better to buy
>stuff over there that is rated at 110V?
>
>Also, is it possible to wire two outlets in series to get 220V? Or is
>that asking for trouble!?
>
If each outlet is from a separate, isolated hydroelectric plant, this will
work.  If your power comes from a nuclear plant, however, it would mean
the end of the universe as we know it.




Seriously, I'd sell everything and buy 110V stuff after you move.
(P.S. -- Just in case someone would try it - don't wire two outlets in
series.  That is asking for trouble of the sparks and fire variety.)

Dan Carson
John Fluke Mfg.
Everett, WA   USA

From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Wed, 20 Jan 1993 21:47:23 GMT
Subject: Re: design for 100 or 1000 Hz wave generator
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

> What is the easiest way to make a waver generator (square or sinusoidal)
> in the freq range of 100-1000 Hz?
> 
> It must be very stable and accurate. It must not change frequency much when
> the temp changes.
> 
> Are there crystals for this sort of freq?

Sorry, you're going to have to give more information than that.  How stable,
and how accurate?

The first thing that comes to mind would be a PLL frequency synthesizer 
using a crystal oscillator reference, possibly with the crystal in an oven.
But that may be overkill - won't know 'til you supply the specs!


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   Systems Technology Div.  |those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Newsgroups: sci.electronics
From: Mike Diack <mike-d@staff.tc.umn.edu>
Subject: Re: Recording sound on chip
X-Xxmessage-Id: <A78D0B000702650E@dialup-slip-1-14.gw.umn.edu>
X-Xxdate: Thu, 28 Jan 93 04:01:04 GMT
Organization: persian cat & carpet co.
X-Useragent: Nuntius v1.1.1d7
Date: Wed, 27 Jan 1993 14:52:28 GMT

In article <1993Jan27.131806.13886@inmos.co.uk> Gary Morton,
gary@mario.inmos.co.uk writes:

> Has anyone from outside the UK ordered from Maplin,
> and if so what was their service like ?

Yes - I ordered a big bunch of TOKO coils (for mains carrier comms) 
from these guys, from New Zealand and :
1 : their delivery time was great (just over a week)
2 : their bulk discount was excellent
3 : their system of calculating postage (a percentage of order price)
sucked, because these were tiny lightweight components - next time
i'll order power transformers (tee hee)
4 : they take visa (cuts the order->delivery time heaps)

altogether a good deal, no complaints.
cheers
Mike.
Xref: sparky sci.electronics:23576 rec.audio:19647 rec.audio.car:5907 rec.audio.pro:2891
From: cullen@ac.dal.ca
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
Subject: Re: 12V Power Amplifier Design
Date: 28 Jan 93 13:52:35 -0400
Organization: Dalhousie University, Halifax, Nova Scotia, Canada

Carl Smith writes:
> Jason Reiser... Asleep writes:
>> Carl Smith writes:

(Stuff deleted)
 
> Well, again, the original poster mentioned "multi-kilowatt" amps.  I
> assume that if you have a 1000 watt amp that you don't run it at
> 30 watts all the time.  If you run it at 1/3 or half volume, you
> still have to be drawing a few hundred watts average, which the 
> average cars electrical system can't supply indefinitely without
> battery discharge...

No, remember we are talking about a log function. 3dB increase is 
double the power, and 10dB is 10 times the power. If you assume
that full volume is 0dB attenuation, and produces full output,
and half volume is 20dB attenuation, then assuming 1kW at full output,
you get 10W at half volume.

(Stuff Deleted)
  
>>That's fine, but
>>as I said, it's not going to be opertaing at full output at all times
>>(I hope for your ears sake). 
 
> Yeah, that's another thing that makes me wonder about the people with
> massive amps.  A kilowatt of sound, even at 1/3 volume, should be
> !@#@!$ loud.  Not to mention the fact that when you crank it up
> you probably won't have windows in your car for long.  My 200W
> home stereo makes the glass in my bedroom window rattle at about 
> half volume...

I would assume that most amps for the car market would have about the same 
voltage gain, in which case a quarter turn of the volume knob would 
produce the same results with any power amp. I don't know if this is the
case, though. Most "pro" amps have about the same voltage gain, within a 
dB or so.

(More stuff Deleted) 
> Well, like you said yourself above, you need some headroom for
> loud transients, so buy one twice as loud as you plan to use it,
> and keep it at half volume or less.  :)

Better yet, allow for 8 to 15dB of headroom above average output.


						Mur
						Cullen@ac.dal.ca
						Cullen@ug.cs.dal.ca
From: laird@pasture.ecn.purdue.edu (Kyler Laird)
Newsgroups: sci.electronics
Subject: What happened to all of the caller-ID units?
Date: 27 Jan 93 22:17:05 GMT
Organization: Purdue University Engineering Computer Network

I just found out that I can get Caller-ID so I thought I'd rush
right out (call) and get one of the kits that I see so often in
Electronic Shopper.

They're all gone!  (or at least I didn't see them)

If you know of a good kit, please give me the details.

Also, Home Automation Labs sells some pricey units that suppport the
name field.  Do most units do this.  The HAL description lead me to
think that this was special.

Oh, yes, how hard do you think it would be to use one Caller-ID unit
for two phones?  I shouldn't have a hard time switching it to the
ringing line for a few seconds.  I'm not worried about simultaneous
calls.

Thanks!

--kyler
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Newsgroups: sci.electronics
Subject: Re: Mounting Large Axials
Date: 24 Jan 93 15:08:17 GMT
Organization: Northeastern Ohio Universities College of Medicine

>ways for mouting axial lead capacitors.

The way I do it, space permitted, is to drill a hole on each side
of the capacitor and strap it down to the PC board with a nylon tie
wrap.

I'd imagine that glue would be problematic due to the fact that the
aluminum case of the capcitor is likely to have quite different
thermal charcacteristics from the surface on which it is mounted.


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
Newsgroups: sci.electronics
From: dang@edsi.plexus.COM (Dan Gardner)
Subject: Re: Mounting Large Axials
Organization: Enterprise Data Systems Incorporated, Appleton WI
Date: Fri, 22 Jan 1993 02:03:27 GMT

I seem to remember that Panduit or some company like them
made nylon straps (not zipties) that could be cinched to the
body of the cap and then attached to the PCB with a fastener
such as a machine screw and a nut. The straps were ridged
on the surfaces that met to give a positive cinching position.

I've seen this kind of stuff in industrial power supplies.

-- 
 ___    __________________________________________
|   )  (  dang@cserver.plexus.com                 |
|  (    )                                         |
|   )  (  A woodchip a day keeps the doctor away. |
Newsgroups: sci.electronics
From: Carr-C10973@email.comm.mot.com (Eric Carr)
Subject: Re: Help locate anemometer
Organization: Motorola LMPS Engineering
Date: Tue, 26 Jan 1993 19:56:55 GMT
Followup-To: sci.electronics

In article <1993Jan26.035028.21725@news.columbia.edu>,
hyx1@cunixb.cc.columbia.edu (Harry Y Xu) wrote:
> 
> I've been trying to locate an anemometer with an electrical output for
> a while without much success.  The device is to be used to measure wind 
> speed on top of a residential building.
> 
> If you know of manufacturers or dealers, please help out by posting or
> e-mailing the info.

There's a company called Davis Instruments that have a variety of weather
monitoring devices for low prices.  Their address is:

Davis Instruments
3465 Diablo Ave.
Hayward, CA  94545

ph. (800) 678-3669
Newsgroups: sci.electronics
From: wolfgang@wsrcc.com (Wolfgang S. Rupprecht)
Subject: Re: QUESTION: The R is out on my RGB monitor
Organization: W S Rupprecht Computer Consulting, Fremont CA
Date: Fri, 22 Jan 1993 03:25:25 GMT

>Well, the Red has left my VGA monitor the other day so I no longer
>have any colors with red it it.  When the dealer came to give me a
>new one, he said he would get rid of it for me.

Yea, he'll probably just sell it to a guy that is red-green color
blind. ;-)

-wolfgang

PS. Fixing it shouldn't be that hard for someone that does that sort
    of stuff.  Its pretty brainless work to compare the broken red amp
    stage to the working green or blue stages and see what looks
    different.  I wouldn't suggest someone unfamiliar with HV hazards
    try this though.
-- 
Wolfgang Rupprecht    wolfgang@wsrcc.com (or) decwrl!wsrcc!wolfgang
Snail Mail:           39469 Gallaudet Drive, Fremont, CA 94538-4511
Newsgroups: sci.electronics
From: shad04@ccu.umanitoba.ca (Dan Fandrich)
Subject: Re: Crystals!
Organization: University of Manitoba, Winnipeg, Manitoba, Canada
Date: Sun, 24 Jan 1993 11:53:50 GMT

In article <1993Jan21.183404.1534@mnemosyne.cs.du.edu> rduta@nyx.cs.du.edu (Radu) writes:
>Can someone please tell me some more info about crystals.  I need to make
>a electronic switch to select between two crystlas (2MHz, and 8MHz -about),I
>tried using a 4016 (IC switch), and it didn't work.  Can someople please
>give me another solution.  I'm desperate.

The 4016 can have a fairly high internal resistance (2k).  Why not use the 
8 MHz crystal and selectively divide the output by 4 or use a PLL?

>>> Dan
-- 
Internet: shad04@ccu.umanitoba.ca               Compu$erve: 72365,306
From: slmdj@cc.usu.edu
Newsgroups: sci.electronics
Subject: Re: Voltage drop across 1N4148 diode?
Date: 21 Jan 93 15:45:31 GMT
Organization: Utah State University

In article <1993Jan21.101200.8651@mr.med.ge.com>, szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983) writes:
> 
> 
> The voltage drop across the 1N4148 diode depends on what type of
> semiconductor material it is made of.  If the diode is made of
> germanium (no, not the flowers) the drop is around 0.7V; if it
> is made of silicon then the drop is around 0.5V.
> 
> The 1N4148 is usually used in computer applications and most
> general purpose circuit board applications where small currents
> are used.  I agree that the 1N4001 would be a better diode for
> this particular application.
> 
> 
> Jerry
> 

I always thought it was the other way around...  0.5V for germanium and 0.7V
for silicon (like the 1N400x's)???
-- 
********************************************************************************
      Paul Cowley      * ..."It's easier said than done."   And if you don't 
   ==EE Undergrad==    * believe it, try proving that it's easier done than
 Utah State University * said and you'll find that 'it's easier said that "it's
  C/A1C  CAP Utah Wing * easier done than said" than it is done.'  Which really
   slmdj@cc.usu.edu    * proves that it's easier said than done.
********************************************************************************
Newsgroups: sci.electronics
From: wtm@uhura.neoucom.edu (Bill Mayhew)
Subject: Re: Mounting Large Axials
Organization: Northeastern Ohio Universities College of Medicine
Date: Wed, 27 Jan 1993 13:44:30 GMT

For shock mounting, one needs to be careful.  Better to use screw
terminals with appropriately terminated flexible leads.  If the
body of the capacitor can move relative to the printed circuit card
on which it is mounted, the soldered connections on the card will
inevitably crack.  It is doubtful a shock-mounted component without
flexible leads would make it through a mil spec vibration soak.

Ruggedizing for military or rough industrial applications is quite
an art form.  If you're new to the field, it is a good idea to
consult with a packaging mechanical engineer that knows the field.

Even consumer stuff can suffer from cracked solder connections even
with light duty.  I've fixed quite a few of those pizza box type AC
power distribution centers that are supposed to fit between one's
computer and monitor.  They were mostly "Computer Accessories"
brand, but there are some that look identical with other labels on
the front.  In these units, there are big inductors that are
stuffed into a PC board.  There is about 1 cm of space between the
PC board and the inductors in most units.  Several came in the door
DOA due to cracks.  Many others failed after time passed (but were
apparently cracked due to handling in shipping; I doubt they were
dropped by the end users.)  It is ironic that these units have
UL/CSA stickers.  Had I been those certification bodies; I would
not have passed those units -- apparently the models being made
were more sloppily constructed than the lab queens given to the
certifiers.  My fix was to strap down the inductors so they're
flush against the PC boards.


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu (140.220.1.1)    146.580: N8WED
From: dont@klic.rain.com (Don taylor)
Newsgroups: sci.electronics
Subject: Looking for circuit to grab ISA bus port Reads, not just Writes
Date: 21 Jan 93 08:25:35 GMT
Article-I.D.: klic.1993Jan21.082535.10632
Distribution: na
Organization: KLIC

Typical clone of an IBM ISA bus.

It is easy enough to put together a latch to capture port writes.
Getting the timing right to be able to catch port reads looks harder.

In other words, what I am trying to do is add a small board
that sits on the ISA bus and COMPLETELY TRANSPARENTLY latches
bytes (or words) as they are READ from a port by the processor.

Does anyone have an idea of how to do this?

This doesn't have to be reliable enough to be a commercial product,
but should be reliable enough to provide more information than frustration.

Please reply by email if possible

Thanks
Don Taylor
503-235-6853
dont@klic.rain.com
dont@pdaxs.techbook.com
Newsgroups: sci.electronics,triangle.forsale