HDTenEightyP/NetNews huggingface dataset:
From: rusty@anasazi.com (Rusty Carruth)
Subject: Re: Need Info. about NiCd Battery Pack
Organization: Anasazi Inc Phx Az USA
Date: Fri, 22 Jan 1993 16:55:16 GMT
Keywords: NiCd battery pack, volts, currency

Note that I've removed rec.radio.amateur.misc and rec.video from the
distribution line...

In article <C0t4IM.4ot@news2.cis.umn.edu> park@umnstat.stat.umn.edu (Chongsun Park) writes:
>I have a 7.2V, 700mAh NiCd battery pack. I want to know that how many volts
>and amps I can put into this battery pack to charge?  Is there any limit or 
>recommendation for these(volts, and amps)?

My understanding:

you can charge this thing at .1C which means .1 * max current which
means 70 mA for approx 10 hours.  "Volts don't matter, current does"
it says here :-)  ("here" being the non-parity-checked ram of my brain!)

>Thanks in advance.

Dont' trust anything I say - I've never had any luck with NiCds
lasting more than about 1 month.  But the above is what everybody
else says is true ;-)

>Chongsun Park

>Chongsun Park          H: 612-331-7022   Internet:park@stat.umn.edu
>1018 27TH AVE SE #B    O: 612-625-5247            stat261@staff.tc.umn.edu
>MPLS, MN55414             612-625-3121            HL1ABT HL1AWG KB0FME
-- 
73 de Rusty Carruth, N7IKQ   P.O. Box 27001, Tempe, AZ 85285
      (602) 870-3330         !'s:{ames!ncar!noao!asuvax,mcdphx}!anasaz!rusty
@'s: rusty@anasazi.com       LastResort: rusty%anasaz.UUCP@asuvax.eas.asu.edu
Join the Usenet Un-Net:      1700-1900Z  Saturdays, 28.410 or 28.390 MHz
EEK! The 1992 Summer Callsign Project lives! Details: Fred.Lloyd@West.Sun.COM
From: snydert@dmapub.dma.org (Tony Snyder)
Newsgroups: sci.electronics
Subject: Re: VT102 setup
Date: 24 Jan 93 15:15:32 GMT
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]

FELSON_ADJ@CCSUB.CTSTATEU.EDU wrote:
: I have an ancient VT102 terminal;  Does anyone know what the various setup bits
: do?  ( there are 7 nybbles in setups B ) 
: Is this documentation at some FTP somewhere? 


: ( Maybe this should go to alt.folklore.computers... :-P )

Also try comp.terminal
From: donrm@hpnmdla.sr.hp.com (Don Montgomery)
Date: Thu, 21 Jan 1993 00:43:46 GMT
Subject: Re: Etchant types
Organization: Hewlett-Packard, Santa Rosa, CA
Newsgroups: sci.electronics

In sci.electronics, v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:

>     What are the advantages of Ferric Chloride vs. Ammonium Persulphate.

I used to use a commercial Ammonium Persulfate etch.  It used a mercury
compound as a catalyst and mercury is pretty poisonous.  You might check
the -persulfate etch you're using to see if it contains mercury.

BTW, I was heating the etchant on the little lady's stove to speed the pro-
cess...the dish broke spilling the persulfate all over the chrome-plated
burner and instantly copper-plated it.   

Don Montgomery
donrm@sr.hp.com
Newsgroups: sci.electronics
From: d88nikne@odalix.ida.liu.se (Niklas Netz)
Subject: What is a 100H640 ?
Organization: CIS Dept, Univ of Linkoping, Sweden
Date: Sun, 24 Jan 1993 20:04:17 GMT

What is this 100H640 device? It is a 28-pin PLCC made by Motorola.
I know it's some kind of ECL chip, but I can't find it in the Motorola
ECL book (which is a few years old though).
A description of what it is would be very appreciated, and a pinout would
be even better (I won't complain if I get both, of course :-).

--
Niklas Netz
d88nikne@und.ida.liu.se
Organization: Queen's University at Kingston
Date: Fri, 22 Jan 1993 18:46:17 EST
From: <LEEK@QUCDN.QueensU.CA>
Newsgroups: sci.electronics
Subject: Re: Wanted: Nicad Charger Plans

>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.

Just seen a MAXIM (sp?) AD in Electronic Engineering (U.K. magazine ?)
for their new NiCd charger IC that automatically regulate charging current
from quick charge to tickle charge.  Might want to give them a call.

K. C. Lee
Elec. Eng. Grad. Student
Newsgroups: sci.electronics
From: hinz@bonfire (David Hinz (hinz@picard.med.ge.com))
Subject: Re: SOA Sound Chip wanted for uProc Card
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL8]
Date: Tue, 26 Jan 93 11:28:30 GMT

Andrew Wang (andywang@crown.berkeley.edu) wrote:

: Simple three-channel sound chips like the one that was found in the
: Commodore 64 are very hard to find now, having been obsoleted by
: their manufacturer. Some that fall into this category:
: General Instrument AY-3-8910, AY-3-8912, Mostek 65??

I've got several of these C64 sound chips, new in the tube, if anyone's
interested let me know.  Any idea what they're worth?  I always wanted
to do something with them, but....

--

Dave Hinz  -  Opinions expressed are mine, not my employer's.  Obviously.
Ask me if I have an opinion on this! \ Don't blame me; I voted for Perot!
SAAB - Because you get what you pay for.     \       Pherrets are Phun!!!
Newsgroups: sci.electronics
From: snydert@dmapub.dma.org (Tony Snyder)
Subject: Re: Microwave Popcorn (how day do dat :})
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]
Distribution: usa
Date: Sat, 23 Jan 1993 14:14:04 GMT

joseph.e.cretney (cretney@cbnewse.cb.att.com) wrote:

: OK - an odd question that may belong in this newsgroup.

: Lets talk about microwave popcorn bags.  I took one apart
: to see what made the bag heat up and all I found was a gray
: colored film (somewhat like the ESD plastic baggies that 
: protect ICs.)  I need to know what this film is and if 
: anyone knows of a source for this stuff.  Also, any simple
: simon explanation on why this stuff heats up in the microwave
: would be appreciated.

Joe,
	This is a guess, but I think the popcorn heats by virtue of its
water content, minimal though it may be.  I think the bag is made to
keep the stuff fresh and in there.  I am waiting to hear from others
on this matter.
                       Tony
From: squish@endor.uucp (Shishin Yamada)
Newsgroups: sci.electronics
Subject: Re: Looking for PCB layout program
Date: 24 Jan 93 06:59:51 GMT
Article-I.D.: das.1993Jan24.065951.26614
Distribution: usa
Organization: Aiken Computation Lab, Harvard University

In article <C19Dtn.1v6@wang.com> pvr@wang.com writes:
>mikek@neptune.iex.com (Mike Keilhofer) writes:
>
>>Can anyone recomend a PCB layout program for the IBM PC? I'm
>>only looking for manual layout capabilities and the ability
>>to print the design.
>
>   Try PADS-PCB.   It is available as a fully working demo.   It
>is only limited in the size of the design that it will handle.
>No not than two board layers and about 20 IC's.   It has a
>schematic capture editor, a board layout editor, an auto-router,
>and a large parts library.   You can get it from Simtel20.

	Hiho, I was wondering if anyone knew of any good PCB
autorouting packages for the Mac. I have seen the C source code for an
autorouter (from someone at Microsoft), but it was a port from the
IBM, and as such lacks many of the Mac ammenities. Also, it had poor
printer support (only for HP laserjets). Are their any others? Also, I
have seen QuikCircuit (by Douglas Electronics), and was not impressed
by this buggy product (1985 version in the robotics lab).

	I was looking for just standard apple laserprinter output, so
we could fab small boards in house (we also luckily have access to
full NC CAM machines, including a NC-PCB machine, which takes NC
codes, but has no software... There is a gerber hack running it right now).

	I've tried running PADS and think it's great. Do they supply a
Mac version? Thanks in advance for all replies.

-Shishin "Squish" Yamada
squish@endor.harvard.edu

Division of Applied Sciences
Electrical Engineering
Harvard University
Cambridge, MA 02138
Newsgroups: sci.electronics
From: pvr@wang.com ()
Subject: Making PC boards using a plotter
Organization: Wang Labs, Lowell MA, USA
Date: Mon, 25 Jan 1993 17:45:31 GMT

    I have been experimenting with using a steel tip pen on pc board
and have had quite good results.   I also got the fiber tip pens, 31HP03K-2,
that were mentioned.   These work fine as far as the resist characteristic
goes.   They are not so good on line with.   They take about a half
inch to start drawing properly, this with only 30 seconds of uncapped
time before plotting.

   The ink that I use in my steel pens is Staedtler 748 PLP red.
Before you run out and order it, it has been discontinued.   Not
that they don't make it anymore, they don't import it anymore.
Their technical person told me that EPA labeling rules dictated
a warning label and they only sold $5000 worth of the stuff a year
so they stopped shipping it over.   It is the ink used in the
31HP03K-2 pens that were mentioned.

   I use a Staedtler 757-PL2-CS pen tip.   This is a .25 mm, cross
groved, tungsten carbide tip pen.   It produces consistant width
lines that have a consistent coating of ink.   I also tried a 
ordinary steel tip disposable pen.   These come with the pen
tip not inserted into the ink cartridge.   I punched the membrane
out and dumped the original ink out and refilled it with the 
ink mentioned above.   This worked just as good as the tungsten
pen tip and only cost $10 for the pen verses $50 for the tungsten
tip pen and adapter.   The drawback is that after the ink runs out
of the steel pen you cannot refill it.   The tungsten pen is refillable
and disassemblable for cleaning.

   I get the best results if the lines are drawn twice.   I do this
by specifying the pen width as slightly smaller that the trace width.
This causes the cad package to believe that it has to trace the lines
twice to get the proper width.   The second pass is slightly offset 
from the first.   I use 1 cm/sec plotting speed.

   I bought my bottle of ink at Charrette in Woburn, Mass. just a couple
of weeks ago.   When I went back last monday they had none and
it was not listed in their new catalog.   It is also not listed
in the new Staedtler catalog.   It must have just been discontinued.
There may be other supply places that have left over stock.   I have
one bottle so I am OK for a while.   If someone finds some I would like
to get a couple of extra bottles for reserve.



--
-->>>>>>>>>> Peter Reilley ..... pvr@wiis.wang.com ..... KA1LAT <<<<<<<<<<<--
                     Well, that about says it.
From: 90sra@eng.cam.ac.uk (S.R. Atkins)
Newsgroups: sci.electronics
Subject: Re: Digital Filtering
Keywords: Digital Filter software, Matlab
Date: 27 Jan 93 16:40:30 GMT
Organization: cam.eng

>>> fitzpa@eeel.nist.gov (Gerry FitzPatrick) writes:
>>> 
>>> >I need to design a digital filter (either a notch filter or
>...
>>> >Any ideas on how to write a subroutine that would perform this
>>> >digital filtering on stored data?  Any good books on designing
>>> >digital filters?
>>> 
>>> 'MatLab' from Mathsworks would be absolutely ideal, although rather expensive
>...
As far as books go 'Digital Filters' by R.W.Hamming (prentice-hall 
ISBN 0-13-212571-4) is a pretty good intro.

Steve (90sra@eng.cam.ac.uk)
Xref: sparky sci.electronics:23339 alt.radio.pirate:802
From: aj008@cleveland.Freenet.Edu (Aaron M. Barnes)
Newsgroups: sci.electronics,alt.radio.pirate
Subject: Re: Arizona Case (Was: Re: FM power calculations needed)
Date: 25 Jan 1993 18:58:50 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc10.ins.cwru.edu


There is a mailing list you can join to get technical information
on hobby broadcasting,but I dont rememer the gentlemans` address.
His name is Mycal Johnson,and he also has info packets in hard 
copy he will send you by snail mail if you pay him postage.
Hold on,I found the address:
mycal@netronix.com or to add yourself to the mailing list:
fm-10-request@dg-rtp.dg.com
to contribute to the mailing list:fm-10@dg-rtp.dg.com

The list was originally ased on the Ramsey FM-10 FM stereo transm
itter kit made by Ramsey electronics.It is a low power,but easily
modified,FM stereo transmitter based on the BA1404 fm stereo gene
rator chip.The kit is $29 and can be had from a number of electro
nic outlets.Also the mailing list has expanded to hobby TV transm
itting.Also sold by Ramsey is the TV-6 tv transmitter kit.It sell
s for $19 and can be set up to broadcast on VHF-TV channels 2-6.
Again,for ordering info,join the list.

-- 
Aaron
aj008@cleveland.freenet.edu
Place for Ted Kennedy in Clinton administration? Head of Departme
nt of Transportation roads and BRIDGES division,of course!
Newsgroups: sci.electronics
From: pclink@cheops.qld.tne.oz.au (Rick)
Subject: i860 vs i750.
Organization: Telecom Australia, TNE Computer Support Services
Date: Mon, 25 Jan 1993 00:53:17 GMT


The i750 is being promoted by Intel as a multimedia chipset - real time
video, MPEG decompression, video effects, etc.  Does the i860 have the
wherewithall to compete with the i750?  The bus is wider, it runs faster,
but does the lack of the i750's microcode ops and the bus latency accessing
the VRAM lower the real time performance such that it cannot perform the
same functions as the i750 (as well as its strongpoints - 3D rendering,
Phong shading, blits, etc)?

Thanks,
Rick.
From: nagle@netcom.com (John Nagle)
Newsgroups: sci.electronics
Subject: Re: Excellon PCB drilling standard
Date: 28 Jan 93 08:31:17 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

bordy@edy.elettra.trieste.it (Luca Giovanetti Sismat Genova) writes:
>     is there anybody that can say anything about Excellon file format 
>for plotter drill ?

     It's not very complicated.  Here's part of one.

M48
T01F00S00
T02F00S00
T03F00S00
T04F00S00
T05F00S00
T06F00S00
T07F00S00
%
T01
X029Y018
X02Y015
X039Y019
X023Y015
X02Y014
X039Y018
...
     The first part describes the "tools", the drills being used
(you have to provide a tool list separately), and then we see the holes
being specified, with the tool number ("T01") and the hole locations
"X029Y018".  That's the general idea.

     Most CAD systems for laying out printed circuit boards will produce
a drill file.

					John Nagle
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: Recommendations for Digital Multimeter
Date: 28 Jan 93 04:27:25 GMT
Distribution: usa
Organization: Kernel Mode Systems, San Diego, CA

In article <Jan27.213320.72218@yuma.ACNS.ColoState.EDU>,
 gw214790@LANCE.ColoState.Edu (Galen Watts) writes:
> I'd buy something really cheap from Radio Shark until you really know what
> you need.

I'd go along with this.  I keep a Radio Shack "pocket DMM" (they're on sale
this month for $25, I think) in my tool case.  If it gets stepped on, blown 
up by overvoltage, etc., who cares?  But in the meantime it reads just as 
accurately as the old Simpson 461 DMM, which stays (relatively) safe on the 
bench (along with the Heath VTVM, for old times' sake).  

	--- Jamie Hanrahan, Kernel Mode Systems, San Diego CA
Internet:  jeh@cmkrnl.com, or hanrahan@eisner.decus.org  Uucp: uunet!cmkrnl!jeh
Newsgroups: sci.electronics
From: wiegand@rtsg.mot.com (Robert Wiegand)
Subject: Re: Heat gun pcb cannabalization
Keywords: Heat gun, charring, lack_of_skill, try_again_maybe
Reply-To: motcid!wiegand@uunet.uu.net
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Tue, 26 Jan 1993 15:00:45 GMT

pieterh@sci.kun.nl (Peter Herweijer) writes:

>In <651@rins.ryukoku.ac.jp> will@rins.ryukoku.ac.jp (William Reiken) writes:

>>In article <1jebh6INNie7@clover.csv.warwick.ac.uk>, cstadbg@csv.warwick.ac.uk (Mr M J Brown) writes:
>>>only if you heat ALL the legs. I have also managed to strip boards previously
>>>to getting the Black and Decker with a butane blowtorch. It is a) a question
>>>of practice, and b) remembering it is the PARTS you want to save and not the
>>>board they are on. This will be pretty much damaged by large scale desoldering
>>>

>>	I was told that microchips will be damaged if you use this approach.
>>Does it really matter?
>>

>Using the very same method, I have successfully stripped a bunch of
>computer boards of their components, including Z80 CPU's and 8255 PIO's.
>Everything worked fine.  I did it with a friend, he heated the PCB, I
>pulled out the components and immediately threw them in a bucket of
>water to cool them off, but I don't know if that's necessary.  One tip
>though: do it outside.  The fumes stink and are probably not healthy.

Actually, I would expect that throwing the parts into cold water
could possibly damage them. The sudden temp. change could crack the
die or break one of the lead bonds.

-- 
------------------------------------------------------------------------------
Robert Wiegand - Motorola Inc.
motcid!wiegand@uunet.uu.net            uunet!motcid!wiegand
Disclamer: I didn't do it - I was somewhere else at the time.
From: corvus@cats.ucsc.edu (Scott C Crow)
Newsgroups: sci.electronics
Subject: Re: 9 or 12 VDC Flasher Circuit
Date: 21 Jan 1993 22:06:39 GMT
Organization: University of California; Santa Cruz
Distribution: usa
NNTP-Posting-Host: am.ucsc.edu


Radio Shack sells an LED Flasher chip for a couple bucks.  Forgot the number.
Scott Crow

Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
From: thomasd@tps.COM (Thomas W. Day)
Subject: 12V Power Amplifier Design
Organization: Telectronics Pacing Systems
Date: Mon, 25 Jan 1993 19:50:42 GMT

Can anyone give me some advise on power amplifier design for 12VDC power 
supplies (automotive applications)?  Specifically, what kinds of power 
supplies are typically used in high power (50W+) designs?  I am hoping to 
find a practical way to get a high voltage (>+/-25VDC) supply for a bipolar 
amp.

Thanks,
Tom Day
Xref: sparky sci.electronics:23477 alt.radio.pirate:803
From: FG
Newsgroups: sci.electronics,alt.radio.pirate
Subject: Re: FM power calculations needed
Date: 26 Jan 93 18:09:18 GMT
Organization: Digital Equipment Corporation


In article <1jt890INNlqu@usenet.INS.CWRU.Edu>, aj008@cleveland.Freenet.Edu (Aaron M. Barnes) writes...
> 
>This might be news to some of you folks,but a gentleman in Phoeni
>x,Arizona won his case in court over broadcasting on FM.

	Details please?
	
	I believe that this was the bust that Al Sykes participated in
	personally, as he was in the Phoenix area on personal business
	at the time.

	Interesting
	FG
Xref: sparky sci.electronics:23518 uk.telecom:625
From: esuln@csv.warwick.ac.uk (Mr J S Murray)
Newsgroups: sci.electronics,uk.telecom
Subject: Help identifying modems/ rs232 sharer, old NEC printer please.
Date: 28 Jan 1993 13:43:29 -0000
Organization: Computing Services, University of Warwick, UK
Distribution: world
NNTP-Posting-Host: poppy.csv.warwick.ac.uk


I recently bought some 2nd hand devices and would like help in obtaining
information to use them.

Any information: pinouts, supply connections, suppliers name/ address would be
of great value

'Preview streama' modem
Cased in small aluminium box, power, Tx, Rx LEDs on front, 15 way D connector
and 8 pin DIN connectors on rear, BT phone socket inside.

'Paradyne MPX 9600' some kind of communications device.
4 x 25 way D connectors and 4 screw connectors for Tx, Rx lines.

'Uniwell Mplex-8'  RS232 sharer?
master + 8 x 25 way D connectors, baud rate / mode rotary presets and a
single 7 segment LED display.

NCR printer, no visible identifying code 1982+ design, has 25 way D connector
for input (same gender as PC parallel port).

Once again, any help would be appreciated.

jsm


Newsgroups: sci.electronics
From: dholmes@netcom.com (Dennis Holmes)
Subject: Re: Need info on transformer (novice)
Keywords: transformer
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Thu, 21 Jan 1993 08:09:46 GMT

dholmes@netcom.com (Dennis Holmes) (that's me) writes:

>Can anyone provide info on a Midcom transformer (671-1538, B026)?
>It's used in a modem I'm trying to fix, so turn ratio, ratings, and/or
>substitution information will be greatly appreciated.

><Sigh> Sometimes you just have to tackle things one piece at a time....

Well, never mind, that's not the problem either....
-- 
+-------------------------------------------------------------------------+
| Dennis Holmes                      dholmes@netcom.com                   |
| San Jose, CA                       Disclaimer:  I'm temporarily insane. |
+------=>{ Meanwhile, as Ford said: "Where are my potato chips?" }<=------+
From: rmf@bpdsun1.uucp (Rob Finley)
Newsgroups: sci.electronics
Subject: Desparate for a source of Heathkit replacement parts.
Date: 22 Jan 93 14:16:48 GMT
Distribution: na
Organization: Harris Allied Broadcast Div., Quincy, IL


Dearly need a source for the cpu chip used in Heathkits accurate clock
(the one that syncs itself with WWWV time standard).

Is there a source for replacement parts now?

Thanks  

Robert
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
From: gerald.belton@ozonehole.com (Gerald Belton) 
Newsgroups: sci.electronics
Subject: Structural interference f
Date: 21 Jan 93 15:58:00 GMT
Distribution: world
Organization: The Ozone Hole - SKYDIVE New Orleans! - (504)891-3142 16,800 bps
Reply-To: gerald.belton@ozonehole.com (Gerald Belton) 

>I work in a computer lab in an interior room on the 4th out of 4 floors.
>My radio picks up FM fine but AM does not come in at all unless I move to a
>outer room.

>Moving the antenna makes little difference and is 72 inches long.
>I tried running a wire from the ground plug of an outlet to the antenna but
>it did not help. Why didn't this work? I figured the ground wiring would ac
>as a giant antenna..................... Does it have to do with the geometr
>of the antenna with the flux normal to the surface generated as I assume is
>the case with UHF and VHF television antennas?

> My question is how do I get reception? Can I buy a signal amplifier for
> a radio?

My office is on the fourth of nine floors.  I have the same problem.

First of all, connecting ANYTHING to the whip antenna on your radio
isn't going to help.  The whip antenna is for FM reception.  The AM
antenna is a coil of wire wrapped around a ferrite core inside the
radio.

I purchased a small shortwave receiver from Radio Shack.  I have found
that it picks up AM stations much better than the cheap clock radio I
was using before.  I imagine this is because of a more sensitive
receiver.  I get a lot of noise from my computer, though.  I have found
that be rotating the entire radio and moving it around the room I can
find spots and angles where the noise is minimized, but not completely
eliminated.  Since you are in a computer lab, there is probably much
more noise than my single computer generates.

There are external active antennas that will improve reception of weak
signals, but they also amplify the noise.  I would think that in a
computer lab the interfering signals would be the limiting factor rather
than the weak signal strength of the desired stations.

---
 . SLMR 2.1 . Nothing is so smiple that it can't get screwed up.
                                                                                             
----
+=====================================================================+
| The Ozone Hole - SKYDIVE New Orleans! - (504) 891-3142 HST/DS 16.8K |
| 3 Nodes <> USA Today <> Boardwatch Online <> 10 Gigs <> 73900 Files |
+=====================================================================+
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro