HDTenEightyP/NetNews huggingface dataset:
From: jeroen@dxcern.cern.ch (Jeroen Belleman)
Subject: Re: How to build a cheap, reliable comm link?
Organization: CERN European Laboratory for Particle Physics
Date: Thu, 21 Jan 1993 13:17:18 GMT

In article <pell.727566512@isy> pell@isy.liu.se (P{r Emanuelsson) writes:
>Hi. I am currently looking at building a uni-directional 100 kbit/s link
>for long distances (cable). I will probably FSK modulate a 100 MHz carrier
>or something similar. I'd very much like suggestions for a chip pair to
>perform the above data transfer. It has to be reliable and cost is a major
>factor. I'd prefer to transmit/receive bytes of data, but a bit stream with
>clock is acceptable. Also, if there are chips for performing the
>abovementioned FSK (de)modulation, I'd appreciate some pointers. Will
>summarize answers.

AMD makes a few chips that might just be what you're looking for.
They're perhaps a bit faster than needed though.
Look up the AM7968 and AM7969, a.k.a TAXIchips.
The former accepts a parallel word which gets serialized and sent to
the latter, which convert it back to parallel format. Bit rates up
to 100M bits/s.

Cost was around $35 per chip, when I last looked.

Best regards,
Jeroen Belleman
jeroen@dxcern.cern.ch
From: chideste@pt.Cyanamid.COM (Dale Chidester)
Newsgroups: sci.electronics
Subject: RCA TAC-200 Parts ID?
Date: 25 Jan 1993 08:46:06 -0600
Organization: UTexas Mail-to-News Gateway
NNTP-Posting-Host: cs.utexas.edu


I have been trying to "reverse engineer" RCA TAC-200 high band channel elements
to come up with an inexpensive kit.  Receive is okay and almost done, but there
are several parts on the Transmit channel element I cannot identify.  They are:

	RT1, RT2 and RT3  which have a brown, yellow and black, respectively,
		dots on them.  I think these are negative temperature coeficient
		thermistors with values of about 3.5K, 6K and 30K at room temp.

	CR1 the tuning diode.  Number on it is A1 7567 -1

	Q1  a NPN transistor.  Numbers on it are 185 593-1 144

	Q2  a PNP transistor.  Numbers on it are 185 131 183-1

If anyone can help me with the identification of these or provide me with
information about suitable replacement parts for them, I would be most
grateful.  Please reply via EMAIL to chideste@cyanamid.com.

		Thanks and 73
				Dale
 

------------------------------------------------------------------------
Dale H. Chidester, PhD           N3HAL      "Against ignorance, even the 
American Cyanamid Company                    Gods in vain doth contend."
Agricultural Research Divison                                     Goethe
PO Box 400,  Clarksville Rd.     Phone: (609) 799-0400 x2430
Princeton, NJ  08543-0400        Email: chideste@cyanamid.com 
------------------------------------------------------------------------
Newsgroups: sci.electronics
From: rfc@allegra.att.com (Robert F. Casey)
Subject: Re: 110V -> 220/240Vconversion for appliances
Organization: AT&T Bell Laboratories, Murray Hill, NJ
Date: Wed, 27 Jan 1993 00:23:18 GMT

In article <ERIC.93Jan22165058@kilo.mks.com> eric@kilo.mks.com (Eric Gisin) writes:
>You can install 15A, 230-240V receptacles and meet the Canadian electric code.
>You can run a circuit to the distribution panel,
>or (not to code) connect to the split 120-120V
>receptacles that all recently wired kitchen counters have.
>
>However, if you plug in any non-CSA approved appliances into any outlet,
>and they cause a fire, your insurance will not pay any claims.

Are they really that strict?  I would have thought that the European 
approvals might be seen as reasonably equivalent by the insurance
company.  But they might have a problem if you did a sloppy job
of connecting the power to the European equipment.
From: luca@Xenon.Stanford.EDU (Luca De Alfaro)
Newsgroups: sci.electronics
Subject: AC adaptors in USA & Europe
Date: 27 Jan 93 22:19:28 GMT
Organization: CS Department, Stanford University, California, USA


I noticed something interesting (and annoying). Many appliances in the
US (such as radios, cordless telephones and answering machines) run on
low-voltage (3-12V) DC current. They are usually sold together with an
AC/DC converter from 120V AC to DC of the appropriate voltage. 

When I bring them to Europe, there are two solutions (at least) to get
them working:

1) Buy an adaptor (autotransformer or else) to lower the AC from 220
to 120, and connect the AC/DC converter after the adaptor.

2) Buy another AC/DC converter, with the same DC voltage output (and a
reasonable current rating) and 220 instead of 120 V AC input.

Solution 1 works, even if the autotransformer gets a bit hot if you
leave it always plugged in (as you have to for answering machines, for
example). Since solution 2 is more compact (only the converter,
without adaptor), and the price of a converter is similar to the one
of an adaptor, I have often tried it. However, this solution does not
seem to work. In the radio/cordless telephone I always hear a
noticeable hum, probably at 50Hz (and due to the line frequency). 

Why? I have the following explanations:

a) The AC/DC converters you can buy separately from appliances are of
much lower quality of those you get together with them. 
But I opened both types, and the electronics seems to be the same,
more or less (I checked circuit configuration & component type).

b) The AC/DC converters sold with the appliances are in some way
specialized to filter out the noise components that give the most
inconvenience to the appliance.
But, again, their circuitry seems to be fairly simple and standard.

Does anybody know why solution 1 always works, while solution 2 seldom
does?

				Luca
Newsgroups: sci.electronics
From: sosc1101@wc20.writer.yorku.ca (Sean Nicol)
Subject: Pyrotechnics
Organization: York University
Date: Thu, 21 Jan 1993 20:47:26 GMT

I am looking for some info on how to design a computerized firing  
sequence.  Any sort of direction to find info would be just as helpful,  
such as books, magazines or if anyone has designed one of their own.  
 
Newsgroups: sci.electronics
From: laird@pasture.ecn.purdue.edu (Kyler Laird)
Subject: Re: HC11 EVB MC68HC24 PRU
Organization: Purdue University Engineering Computer Network
Date: 23 Jan 93 14:07:25 GMT

tedwards@wam.umd.edu (technopagan priest) writes:

>Hi!  I think I just toasted the MC68HC24 PRU (port replacement
>unit) on my (old) HC11 EVB.  Does anyone know where I can
>order a replacement PRU from?  

You idiot!  What'd you do?  Lay an input line across one of the
12V rails?  (Gee, that's what I did...)

University Sales (Relations/.../?) at Motorola sent me a new one
when I told them I toasted mine.  I almost ordered one from Digi-
Key or someone like that, but they wanted on the order of $35 for
the chip!

Good luck!

--kyler
From: jgallego@cyber.net (Jose Gallego)
Newsgroups: sci.electronics
Subject: Source for rubber sheets
Date: 21 Jan 1993 08:19:55 GMT
Organization: The Cyberspace Station
Distribution: world
NNTP-Posting-Host: cyber.net

I am looking for a source for rubber sheets such as the ones used on the
bottom side of most mouse pads.

Any information will be greatly appreciated.

Thanks!!
Jose~


-- 
Jose~ M. Gallego
San Diego, CA USA
jgallego@cyber.net
Newsgroups: sci.electronics
From: gcouger@olesun.okstate.edu (Gordon Couger)
Subject: Re: Auto "tow" sensor idea needed
Organization: Oklahoma State University, Stillwater
Date: Tue, 26 Jan 1993 02:05:17 GMT

In article <43975@sdcc12.ucsd.edu> afong@sdcc13.ucsd.edu (Krell Kraver) writes:
>
> 
>I need help designing a "tow" sensor to add on to my existing car
>alarm.
> 
>I can't use an ordinary tilt sensor either, since if I park on a
>hill, it won't work!
How about Hall effect sensors on the front & rear wheels. If one
set turns and not the other you are being towed. They would also
work for a skid and hydorplane sensor.
Gordon
Gordon Couger
AB5Dg   Agriculture Engineering Oklahoma State University
gcouger@olesun.agen.okstate.edu 405-744-6514 day 744-2794 evenings
From: bailey@atlantis.CS.ORST.EDU (Kirk Bailey)
Newsgroups: sci.electronics
Subject: What is "pikal" solvent?
Date: 22 Jan 1993 01:56:10 GMT
Organization: OSU CS Outreach Services, Corvallis, Oregon
NNTP-Posting-Host: atlantis.cs.orst.edu

I'm trying to find out what sort of solvent this is, and who makes it.  It is
apparently used in de-fluxing surface mount boards and in cleaning toner off
copier drums.       

	Thanks in advance,

		Kirk Bailey
		bailey@jacobs.cs.orst.edu

Newsgroups: sci.electronics
From: kong@leland.Stanford.EDU (Kong Kritayakirana)
Subject: Electronic Parts Retail outlet
Organization: DSG, Stanford University, CA 94305, USA
Distribution: ba
Date: Tue, 26 Jan 93 00:05:37 GMT

Hello Netters:

The subject says it. I want to locate some stores that would basically let me
browse through their electronic parts and stuff. (Like Fry's for example). I am
looking for high quality metal film capacitors, high quality opamps, and high
quality vectorboards. Any help locating the store name and phone number in the
bay area (preferably from Redwood City --> Sunnyvale) will be greatly
appreciated.

Thanks again in advance

Please email responses.

Kong Kritayakirana (kong@leland.stanford.edu)

Newsgroups: sci.electronics
From: lana@news.mit.edu (Svetlana Panasyuk)
Subject: Is there any chips catalogs accessable thru Internet?
Organization: Massachvsetts Institvte of Technology
X-Newsreader: TIN [version 1.1 PL6]
Date: Wed, 27 Jan 1993 14:42:19 GMT


Hello networkers!

Is there any chips catalog accessable thru Internet ( e.g anonymous FTP).
Your answer will be highly appreciated!

Please answer by e-mail lana@meinesz.mit.edu

Thanks in advance!

Svetlana.


Newsgroups: sci.electronics
From: wout@dutentb.et.tudelft.nl (Wout Serdijn)
Subject: Re: Temperature to Frequency converter ??
Organization: Delft University of Technology, Dept. of Electrical Engineering
Date: Thu, 21 Jan 1993 08:52:34 GMT

In <C16Kwr.LK8@rahul.net> rla@rahul.net (Bob Armstrong) writes:

>  I remember reading about a 3 terminal device which would sense
>temperature and output a TTL compatible pulse train with a
>frequency proportional to the temperature.  But I don't remember
>what it was or who made it.

>  Does anyone know of such a device ?  Where can they be bought ?

>Thanks,
>Bob Armstrong
>rla@rahul.net
>-- 
>Bob Armstrong <rla@rahul.net>

All I can think of is the Smart Temperature Sensor, SMT 160-30, brought
on the market by Smartech BV, Breda, The Netherlands (one or two dollars
I guess). The sensor provides a dutycycle modulated signal which can be
processed by a simple processor or a computer. The absolute accuracy amounts
to .5 degrees Celsius in the range from -30 to +100 degrees (C) and 1 degree
from -45 to +130 degrees (C). The resolution is in the order of 1 milli-degree

Hope this helps. Best 73's

Wouter

Newsgroups: sci.electronics
From: markz@ssc.com (Mark Zenier)
Subject: Re: My TV is in a funny spot.......
Organization: SSC, Inc.,  Seattle, WA
Date: Sat, 23 Jan 1993 18:05:34 GMT
X-Newsreader: TIN [version 1.1 PL6]

philip rose `94 (rose@bucknell.edu) wrote:
: 
: In article <1993Jan19.210044.261775@sue.cc.uregina.ca>, VBHARGAVA@Meena.CC.URegina.CA (Bhargava, Vipin k) writes:
: |> If I do turn it to the UHF, and put it on 14 or 15 I can watch SATTELITE
: |> TV!  My neighbour has a dish, and I seem to be getting some sort of 
: |> deflection onto my set.  

: |> others.  I also can watch him switch satellites/channels and actually see 
: |> the numbers of the channel/satellite he wants.  He also owns a Sega Genesis
: |> and I can watch him play games on it. :-)
: 
: 
: Your neighbour must have a fairly strong signal leak either inside his 
: satellite
: tuner or in the line that runs from his tuner to his TV.  

My guess is that your neighbor is a real electronics junkie and has 
a low power UHF video relay transmitter to send his signal around his
house.  

Ones that use the regular TV channels are illegal in the US, 
but were available until the FCC cracked down on them, and
allowed this sort of service on another band (902 - 928 MHz).

What's their status in Canada?


Mark Zenier  markz@ssc.wa.com
From: baden@bbs.draco.bison.mb.ca (Baden de Bari)
Newsgroups: sci.electronics
Subject: |=| LIYSF ATTENDANTS |=|
Date: Tue, 26 Jan 1993 05:27:11 GMT
Organization: The Draco Unix System [BBS]

 
        I know this isn't the right base for this, sorry, but I've got to 
get this around.  I'd like to hear from any attendants of the 1991 or 
1992 London International Youth Science Forum (LIYSF).
 
                        Thanks.
 
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
     |          ^^^^^^^           ]+[ Baden de Bari ]+[           :
     :         ^ _   _ ^       baden@bbs.draco.inqmind.bison.ca   |
     |        (;()   ();)      baden@sys6626.bison.mb.ca          :
     :         :   ^   :       baden@inqmind.bison.mb.ca          |
     |          \ ... /       Little green men from Mars?         :
     :            ---                    Never!                   |    
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
 


---
baden@bbs.draco.bison.mb.ca (Baden de Bari)
The Draco Unix System [BBS]

From: davew@hpavla.lf.hp.com (Dave Woodie)
Date: Fri, 22 Jan 1993 13:17:14 GMT
Subject: Re: Help! Zilog E-maile address
Organization: Hewlett-Packard Little Falls Site
Newsgroups: sci.electronics

In sci.electronics, sovch@tom.spb.su (Sergey J. Ovcharenko) writes:

> Hi,

> Does anyone know any manufacture which CPU Z80A ?
> I need their E-mail address ( Telex,Fax and phone number if it's possible)
> to contact with ? I'm in Russian and my friend's company wants to import
> these products.

> Thanks !

> Sergey

The Z80 is a product of Zilog, Inc.  Their Phone number is 408-370-8000.
The fax is 408-370-8056.  


Good luck,
Dave Woodie
Newsgroups: sci.electronics
From: jvannes@vms.macc.wisc.edu
Subject: Re: Wanted: Nicad Charger Plans
Organization:  University of Wisconsin Academic Computing Center
Date: 21 JAN 93 02:28:58    

In article <1jhvkuINNb8d@flop.ENGR.ORST.EDU>, slezal@gyro.ECE.ORST.EDU (Lee Slezak) writes...

>I am looking for some plans to build a charger for sub-C size nicad batteries.

I have a serious Ni-Cad fetish.  I have them in everything I own, flashlights,
music equipment, etc.  I have a number of simple chargers based on the LM317
voltage regulator, used as a constant-current source.  All you need for a 
charger is a DC supply that puts out 3-4 volts more than the battery pack
voltage. Feed the DC through the LM317 to limit the current to 10% of the
cell capacity (e.g. 100 mA. charging current for 1 Amp capacity cells).  The
LM317 current limit is programmed by a resistor between the output and Vadj
pins.   See the National Linear book for the circuit and the formula to 
calculate the resistor (Iout = 1.2/R, I Think).  You may need a heat sink if
the regulator has to dissipate more than a watt or two.

The constant-current charger will properly charge battery packs of varying cell
numbers.  Fourteen hours at .1C will give a full charge.
From: vporguen@unl.edu (victor porguen)
Newsgroups: sci.electronics
Subject: Re: Voltage drop across 1N4148 diode?
Date: 24 Jan 1993 15:31:16 GMT
Organization: University of Nebraska--Lincoln	
Distribution: world
NNTP-Posting-Host: unlinfo.unl.edu

The diode with the lowest voltage drop you're likely to find is the 
so-called "back diode", a form of tunnel diode (Ge) in which the peak
voltage is reduced to very low value.

Its forward voltage drop is very close to zero, but the reverse
is not very high... high enough for some interesting applications, 
though.

Look up your literature under "Tunnel Diodes".
From: laird@pasture.ecn.purdue.edu (Kyler Laird)
Newsgroups: sci.electronics
Subject: 3-bit AC light dimmer module
Date: 27 Jan 93 23:34:12 GMT
Organization: Purdue University Engineering Computer Network

I suppose I could hack a dimmer module from an X-10 unit, but I'd like
to find a cleaner, cheaper solution.

So, is there a device that takes power (AC and DC) and 3 bits of logic
in, and produces controlled AC?

Oh, please, please tell me!  (I _need_ this.)

Thanks!

--kyler
From: carmijo@hpnmdla.sr.hp.com (Chris Armijo)
Date: Tue, 26 Jan 1993 06:08:14 GMT
Subject: Re: Internal output resistance on op amps
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics


Modern op amps typically have output resistances anywhere from
10's to 100's of ohms, open loop.  As an eariler poster has
suggested, however, the *closed loop* impedance of the op amp
will be much lower than this, perhaps by as much as a facter
of a hundred thousand (at d.c., that is).  The impedance will
increase with frequency.

In any case, this is a commonly spec'd characteristic.  Just
look up a datasheet from Analog Devices or T.I.

Chris
Newsgroups: sci.electronics
From: eric@telebit.com (Eric Smith)
Subject: Re: New Disk Standard Question
X-Disclaimer: Everything I write is false.
Organization: Telebit Corporation
Date: Thu, 28 Jan 1993 19:39:24 GMT

>>On 27 Jan 1993 16:39:50 GMT, choy@dvinci.USask.Ca (Henry Choy) said:
> What's the scoop on the new read/write optical disk and digital tape
...
> Would anyone be interested in building a 2-disk, 2-tape machine that
> sells from $200?

Don't you suppose there are reasons why optical disk and high density
drives cost way more than $1000 _each_?  Or do you think there is some
amazing conspiracy keeping the prices at twenty times what you think
they are worth?
From: GNR100@psuvm.psu.edu
Newsgroups: sci.electronics
Subject: Descramblers?
Date: 24 Jan 93 21:17:58 GMT
Article-I.D.: psuvm.93024.161759GNR100
Organization: Penn State University


       Is there an FTPable document available on how they work?

                                    Gordon Rogers
                                        gnr100@psuvm.psu.edu
From: scottcr@wkuvx1.bitnet
Newsgroups: sci.electronics
Subject: Re: Voltage drop across 1N4148 diode?
Date: 21 Jan 93 18:07:16 CST
Organization: Western Kentucky University, Bowling Green, KY

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;

What? lets try .2 -.3 for Germanium.

> if it
> is made of silicon then the drop is around 0.5V.

How about .6 - .7   ?
> 
> 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
> 
By the way, a 4148 (at least used to be) silicon.
-- 
Chris Scott,  C/E Public Radio,  Western KY Univ,  (502) 745-3834
SCOTTCR@WKUVX1.BITNET      fx off: 745-2084     fx hm: 781-1232
From: v064mcqs@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
Newsgroups: sci.electronics
Subject: Power Supply Question
Date: 23 Jan 93 04:17:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41


    Im designing a small power supply. I would like to know if using a 12v
center tap transformer when full wave rectified and smoothed be more than
15 volts to allow a 12 volt regulator 7812 work properly. From my understanding
the 78 series regulators need a 3 volt difference atleast. 

		Neil Gandler
From: bote@access.digex.com (John Boteler)
Newsgroups: sci.electronics
Subject: Dumb/simple UART chips
Date: 27 Jan 1993 00:09:08 -0500
Organization: Express Access Public Access UNIX, Greenbelt, Maryland USA
Distribution: world
NNTP-Posting-Host: access.digex.com


Is there a dumb UART readily available?
 
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? National Semiconductor's 16450/16550
data sheet lists the default state of all registers except the Divisor
Latch Register, which is the most important one for my application.
It would be nice if I could simply power it up and strobe it when
data is ready.
 
Maybe I should be looking at the 65xx family?
 

-- 
bote@access.digex.com (John Boteler) 
This week's usenet malapropism: foo, foo-foo
foo=general meaningless expletive, not deleted
foo-foo=the kind of sweet drinks they serve at Armand Chicago Pizzaria
Newsgroups: sci.electronics
From: pmullins@cs.ulowell.edu ([Irish Harp])
Subject: Processor Board building kits?????
Organization: University of Massachusetts at Lowell Computer Science
Date: Wed, 27 Jan 1993 23:17:59 GMT


Hi,

I don't know if this is the correct newsgroup for the following
question, but I will ask anyways.

I study software programming at college, but lately I developed an interested
in learning to construct and read about the construction of  process boards
in computers.

I believe that there are kits and info available that allow one to construct
such boards.  If you have any information about this "sudden interest" (possible
 future hobby), please let me know.

Thanks,

Patrick


-- 
"I am over here, YOU'll always be over there,
 There's an ocean in between,
 The Irish Sea is to your back, An tOilean Ur is to mine,
 As they claimed in '85, We shall return, And I will." 
Newsgroups: sci.electronics
From: madhavn@madhavn.mentorg.com (Madhav Nerurkar)
Subject: Re: PC on a chip
Date: Fri, 29 Jan 1993 01:33:36 GMT
Organization: mentor
Keywords: 
Followup-To: 

In article <C1HHBt.JMp@ms.uky.edu>, msunde01@mik.uky.edu (Mark  Underwood) writes:
|> In article <C1FpoK.MnI@lysator.liu.se> pell@lysator.liu.se (P{r  
|> Emanuelsson) writes:
|> > I've heard of a "PC on a chip" - could anyone tell me who makes these?
|> > 
|> > --
|> > Lysator Computer Society			      pell@lysator.liu.se
|> > University of Linkoping, Sweden	                  
|> ..!uunet!lysator.liu.se!pell
|> 
|> 
|> Cyrix
|> 
|> 	They just recently (last year?) came out with a complete (?) 8086  
|> computer on a chip at about the same time they announced their 386sx and  
|> 386dx clone chips.  I don't know any details, really.  Just remember  
|> seeing a sideline in a Computer Shooper article re: the chip wars between  
|> Intel, Cyrix, and AMD.  You may want to contact Cyrix (address???) for  
|> more info . . ..
|> 
|>  
|> --
|> Mark Underwood
|> EE Student, University of Kentucky
|> Lab Assistant, Boyd Hall Microlab 
|> 	(a tiny little division of UK Library Microlabs)
|> E-Mail:  msunde01@mik.uky.edu
|> 

I think Chips and Technologies, Inc. of San Jose also makes one. Their main number
is (408) 434-0601 in case you want follow up.



Madhav Nerurkar          Disclaimer: These are my opinions.
Newsgroups: sci.electronics