HDTenEightyP/NetNews huggingface dataset:
From: agulhati@willamette.edu (Ashish Gulhati)
Newsgroups: sci.electronics
Subject: Tri State TTL
Date: 5 Apr 92 21:57:21 GMT
Article-I.D.: willamet.1992Apr5.215721.11408
Organization: Willamette University, Salem, OR


Here's the problem: I have to separate systems using two separate power
supplies - and I have an interface in the middle that can be accessed by
both - 

Power1 ------- Interface ------ Power2

Relays switch the interface from one power suppply to the other as needed.
Tri-state drivers from each power supply drive the interface. The question
is - when the Interface is on, let's say Power1 - the outputs of the Tri-state
drivers from Power2 are in a high impedance state, but they have voltages 
from Power1 present on their pins. If the two supplies were the same - this
would be no problem since that's what tri-state logic is for, but is the setup
anove going to either damage the tri-state devices or make them introduce
noise into the system? Or is the connection to them literally an open circuit
that I can forget about once I've disabled them? 

Thanks for any help.
Newsgroups: sci.electronics
From: steve@nuchat.sccsi.com (Steve Nuchia)
Subject: Re: Making a phone line busy / off-hook ?
Organization: South Coast Computing Services, Inc.  Houston
Distribution: usa
Date: Sat, 11 Apr 1992 16:03:15 GMT

In article <83737@bu.edu> apollo@buengc.bu.edu (Doug A. Chan) writes:
>What value resistor & wattage should I use to cause a phone line to
>go into the off-hook condition?

The Telebit modem rack uses 1KOhm, 1Watt.  Works for me.

-- 
Steve Nuchia      South Coast Computing Services, Inc.      (713) 661-3301
Newsgroups: sci.electronics
From: jringle@eos.ncsu.edu (JACK RONALD INGLE)
Subject: Microsoft Specs needed
Organization: North Carolina State University
Date: Wed, 8 Apr 1992 21:49:54 GMT

     I am doing some interfacing on a project and I need the specs on a 
Microsoft mouse.  Any help would be greatly appreciated.

Jack Ingle
jringle@eos.ncsu.edu
From: ghw@brahms.udel.edu (George Watson)
Newsgroups: sci.electronics
Subject: Word origins
Keywords: filters
Date: 9 Apr 92 21:58:25 GMT
Distribution: na
Organization: University of Delaware

Can someone comment on the origin of the words "gyrator"
and "biquad" as they apply to active filters.
We teach a short module on active filters in the context of
an electronics and instrumentation course for physics majors.
Horowitz and Hill's "The Art of Electronics" is our main reference.
One of my students (and now I) would like to know how these
circuits got their names.  Thanks.
Newsgroups: sci.electronics,rec.bicycles,rec.motorcycles
From: grw@HQ.Ileaf.COM (Gary Wasserman)
Subject: Re: Sticky Demand Traffic Light problem solution
Reply-To: grw@HQ.Ileaf.COM (Gary Wasserman)
Organization: Interleaf, Inc.
Date: Tue, 7 Apr 92 17:53:40 GMT

In article <-slj0+=.jps@netcom.com> jps@netcom.com (John Serafin) writes:
> sagerian@delphinium.UUCP (Steve M. Sagerian) writes:
> 
> >I fact I was supprised no one mention that aluminum (sp?) wheels have no effect on the sensor at all.
> 
> Then how does an aluminum frame with aluminum wheels trip sensors?
> (It happens frequently.)
> >Stever
> > 

Is your engine block aluminium?  My K100 had an all aluminium block/head, but
the internals were iron (crank, etc.) and the frame was steel pipe.  I doubt
the you can build an all aluminium street bike.  If a steel bicycle frame
trips the sensor the steel internals in your engine should be more than 
enough to do it, too.

-Gary



-- 
Gary Wasserman      "A completely irrational attraction to BMW bikes"
Interleaf, Inc.      Prospect Place, 9 Hillside Ave, Waltham, MA 02154
grw@ileaf.com        617-290-4990x3423 FAX 617-290-4970       DoD#0216
From: rhaar@albert.cs.gmr.com (Bob Haar)
Newsgroups: sci.electronics
Subject: Re: Request Address of Home Automation Supplie
Date: 7 Apr 92 20:19:04 GMT
Reply-To: rhaar@albert.cs.gmr.com
Organization: G.M. Research Labs

In article ktpj62INN4sp@spim.mips.com, kend@colossus.mips.com (Ken Dockser) writes:
|>
|>I am looking for the address of Home Automation Laboratories and any other companies that deal with the X10
|>home automation systems. Any information would be greatly appreciated.
|>

Home Automation Laboratories
5500 Highlands Parkway, Suite 450
Atlanta, GA 30082

Phone: (404)319-600	

I suggest that you give them a call and ask for their catalog. Their prices
are not always the best, but the catalog is informative.


---
	Robert Haar               InterNet : rhaar@gmr.com 
	Computer Science Dept., G.M. Research Laboratories
DISCLAIMER: Unless indicated otherwise, everything in this note is
personal opinion, not an official statement of General Motors Corp.
From: wellison@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Re: Mail order source for lasers
Date: 8 Apr 92 09:00:40 CDT
Organization: University of Kansas Academic Computing Services


>I would appreciate any information on mail order companies selling
>laser accessories in small quantities. Preferably situated in Europe,
>but others will do quite nicely too.
>
>
>Thanks 	Samu Mielonen, f1sami@uta.fi

Two of the best laser resale companies in the states are:

MWK Industries
198 Lewis Court
Corona, CA 91720
1-800-356-7714
1-714-278-0563
FAX 1-714-278-4887


Meredith Instruments
P.O. Box 1724
6403 N. 59th Ave.
Glendale, AZ 85301
1-602-934-9387
FAX 1-602-939-3369

Both carry quality laser surplus for a cost that won't send you into a tailspin.
They carry everything from laser diodes to HeNe's to large argons and HeCd 's.

=-=-= Wes -=-=-
Newsgroups: sci.electronics
From: zardoz@rx-db (zardoz@rx-db.hf.intel.com)
Subject: Re: Jacob's Ladder
Organization: Intel Development Tools Operation, Hillsboro, OR
Date: Mon, 13 Apr 92 17:50:54 GMT

>In article <z2zt1ta@rpi.edu> richtt@aix.rpi.edu (Timothy G. Richter) writes:
>>
>>So far, everyone has mentioned neon sign transformers.  

Yes, and no one has mentioned oil furnace ignition transformers, which are
more common and less expensive, IMHO.

11,000V, center tap grounded to frame, so don't get shocked.
                                       (do I have to say this?  What's 
                                       wrong with people these days?)

Maybe 50mA, probably more like 10mA.  I built a ladder out of one of these
when I was a kid.  I used coat hangers soldered directly into the outputs
using a 100W iron.  Interestingly, the flame would stop to burn through what-
ever was inserted before continuing up.  It would burn through pencils this
way.  I didn't have the guts to put my finger in there.  Amazingly, I didn't
get shocked by it, though I did from most of the other things I played with
such as old tube radios.  Later in life I had to work on industrial
induction heating equipment that always leaked water.  I had to defeat the
safety interlocks and stand in the water while sticking scope and meter
probes inside.  I didn't get killed doing that either.

WA7LDV

										
-- 
Fan mail may be sent to:
zardoz@rx-db.hf.intel.com
From: hbg6@phx.mcd.mot.com (John Schuch)
Newsgroups: sci.electronics
Subject: Re: 7 segment
Date: 9 Apr 92 19:46:53 GMT
Distribution: usa
Organization: Motorola Computer Group, Tempe, Az.

>>Anyone know where I could get large 7 segment displays?
>>I'd like to make a timer, and a scoreboard.  I made some
>>5" X 7" with LED's but I was hoping I wouldn't have to
>>make anymore because they are kind of a pain.
>>Thanks!!  Oh, it doesn't have to be a certain size, just
>>pretty large would be good.

P-Tec Corp.
4141 State Street E5
Santa Barbara, CA 93110
(805)681-1166

Part number  PD30-CAD-X

4.0" tall seven seg. LED digit with decimal.
8 LED junctions per segment, 2 for the decimal point

These are not 7" tall like you have requested but you can see
them for quite some distance.

If I really HAD to have 7" tall digits, I'd probably backlight
a piece of frosted plexiglass with a dozen or more LEDs per
segment.

John

------------------------------------------------------------------------
John Schuch           hbg6@citek.mcdphx.mot.com            (602)438-3008
------------------------------------------------------------------------
      One wonders if there would be such a pursuit of artificial
      intelligence if there were more of the natural kind around.
------------------------------------------------------------------------
From: danube@dirac.physics.sunsyb.edu (Dan Koller*)
Newsgroups: sci.electronics
Subject: Re: Jacob's Ladder
Date: 7 Apr 92 23:31:35 GMT
Organization: Institute for Theoretical Physics, SUNY at Stony Brook


>>>
>>>      \              /
>>>        \          /
>>>          \      /
>>>            \  /
>>>     _______/  \________
>>>    |                   |
>>>    |    ___________    |
>>>    |   |TRANSFORMER|   |
>>>    +-<=|           |=>-+
>>>        |___________|
>
>BTW - has anyone tried to make a small Jacob's Ladder with one of the
>little dc-operated neon supplies commonly used in "art neon?"  Might
>be able to build one in a length of 1"-1.5" clear plex tubing, and
>make a unit for your desktop.
>
>-- joe pollock     pollock@u.washington.edu


   The following works rather nicely, and can be made small.  I found an
old DEC monitor a year ago, stripped the CRT and threw the rest in the
junk box.  Recently it occurred to me the HV section probably could be
made to work.  I just traced the +12V and ground pins and hooked it up.
I removed the HV rectifier and I had a 15KV or so Tesla coil in 5 minutes!
It's sufficiently powerful to make a 3-4" high Jacob's Ladder, and if you
like PC board art, the extra components look kind of neat on this 
particular board.  If it runs in this fashion without burning up for more
than 20 min., I'll put the whole thing up on the wall, probably with
a neon display of some sort.  Good luck.
							Danube
From: bobkay@pnet51.orb.mn.org (Bob Kyweriga)
Newsgroups: sci.electronics
Subject: Need info on Mot 68HC16 Tool Kit
Date: 9 Apr 92 20:25:01 GMT
Organization: People-Net [pnet51], Minneapolis, MN.

I placed a order with Future Electronics for the Motorola 68HC16
Tool Kit.  While I got my order in time to get it at the discount
price, I didn't get the order in quick enough to avoid a long wait
while Motorola handles a large backorder.

So while I wait could someone tell me:

What kind of power supply will I need for the Tool Kit.

I assume the associated s/w will run on a pc, but is there any
provisions for running the sucker off a Mac.

Any other stuff I might want to gather up in anticipation of
its day of arrival?

Thanks in advance


UUCP: {crash tcnet}!orbit!pnet51!bobkay
ARPA: crash!orbit!pnet51!bobkay@nosc.mil
INET: bobkay@pnet51.orb.mn.org
Xref: sparky sci.electronics:8240 rec.pyrotechnics:1792
From: dbell@cup.portal.com (David J Bell)
Newsgroups: sci.electronics,rec.pyrotechnics
Subject: Re: Proximity detectors, flash pots, smoke pots, radio control
Date: 8 Apr 92 19:27:32 GMT
Distribution: na
Organization: The Portal System (TM)

Easiest and cheapest way I can think of is to go to the
nearest discount home center and pick up some infrared
motion detector-controlled outdoor lights. (Due to the
large numbers sold, the full floodlight kit is actually
cheaper than the detector module itself!) I would install
one of the flood lamps as usual, and wire out from the
other port on the box to the pyro effects. You could 
wire a squib directly to the 120 volt line, but better,
add a small transformer (~12 V) and burn the squib(s) with
the output from that. The remaining lamp would just be 
part of the effect, as well as providing a proper series
resistance to the detector module. The low voltage would
also then be useable to power a short-range FM transmitter
for the alarm.

Dave
From: jfw@ksr.com (John F. Woods)
Newsgroups: sci.electronics
Subject: Re: PSpice 5.0a Uploaded to SIMTEL
Keywords: pspice, upload
Date: 6 Apr 92 10:49:51 EDT

jade@triton.unm.edu (Eric Jaderlund) writes:
>>Pspice 5.0a has been uploaded to the SIMTEL archives available via 
>>anonymous FTP to OAK.oakland.edu (141.210.10.117) or any mirror (if updated).
>>There are three files that must be unzipped each onto a 1.2M or 1.44M floppy
>>to install.
>Anyone know if there is a Macintosh version of this, or something
>comparable??

PSPICE 5.1 for the Mac is available from sumex-aim.stanford.edu, in
info-mac/app/pspice-51.hqx.
From: jfw@ksr.com (John F. Woods)
Newsgroups: sci.electronics
Subject: Re: Electrostatic Field Promotes Hair Growth ???
Date: 10 Apr 92 13:07:21 EDT

larrie@beaufort.sfu.ca (Larrie Simon Carr) writes:
>In article <1992Apr8.161344.1284@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>>I very very much doubt that it works.  At $4500 a month, it sounds like a
>>scheme for separating fools from their money.
>>Ever heard of SCIENTIFIC MEDICINE, folks?
>There is currently research being done at the University of British
>Columbia about the ability of ELECTRIC CURRENT in stimulating hair
>growth.
>They say it works.  Mind you, I wonder the long term effects.

Has anyone duplicated their work?  Science, remember.
Xref: sparky sci.electronics:8475 rec.bicycles:9399 rec.motorcycles:13141
From: bailey@jacobs.CS.ORST.EDU (Kirk Bailey)
Newsgroups: sci.electronics
Subject: Wanted: waveguide mixers/sensors
Date: 15 Apr 92 07:10:36 GMT
Organization: CS Dept. Oregon State University, Corvallis, Oregon.

I'm trying to find a source of waveguide mixers and power sensors (either
thermistor or diode), for the smaller sizes of waveguide.  Complete, working
units would be preferable, but I have access to equipment to attempt repairs
on "blown" units (ie. I'm willing to invest a fair amount of time to try to
minimize my out-of-pocket expenses).  I would also be interested in hearing
from anyone who has "home-brewed" anything more exotic than an unbalanced
thermistor sensor...       

	Cheers,
		Kirk Bailey, N7CCB
		bailey@mist.cs.orst.edu
		P. O. Box 1702
		Corvallis, OR 97339 (USA)
		503-753-4628 (home)
		503-753-9051 (work)
From: bryanh@hplsla.hp.com (Bryan Hoog)
Date: Wed, 8 Apr 1992 02:15:22 GMT
Subject: Before camcorders - info wanted
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics


     Before camcorders, there were video cameras.  A bit smaller than
  today's VHS camcorders, these things were plugged into certain VCRs
  that had the appropriate adapter (a DIN-like connector with 5 or 10
  pins).  The VCR was either stationary or portable; the portable had
  a shoulder strap and batteries.

     An acquaintance picked up several of these beasts, minus the
  VCR portion, and has asked me for assistance.  Does anyone know
  anything about these video cameras?  

     Specifically:

   - The connector appears to be standard between vendors.  Is (was) it?

   - Can the camera be made functional without the VCR?  In other words,
     can I put in power and get out video?  Or was some important part
     of the electronics in the VCR portion (scanning circuits, etc)?

   - Any ideas where I could get documention on the connector?

   - Finally, how does the picture quality in these old cameras (vidicon
     tubes?) compare with the new CCD technology?  

     
      Thanks!
     

 Bryan Hoog (bryanh@lsid.hp.com)
 Hewlett-Packard
 Lake Stevens Instrument Division
 8600 Soper Hill Road
 Everett, Washington  98205
 206-335-2070
From: jmarin@messi.uku.fi (Jukka Marin)
Newsgroups: sci.electronics
Subject: Re: Casio Databank Touch Screen Watches
Date: 16 Apr 92 09:57:31 GMT
Organization: University of Kuopio, Finland

In article <29E8BD78.9814@noiro.acs.uci.edu> gkwan@balboa.eng.uci.edu (Greg Kwan) writes:
>In article <1992Apr11.231955.1841@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
>>I just remembered something... this watch had a BUG in it!  I remember that
>>I had found a key combination that would totally garble the time display.
>>If you hit the main fucntion button so it returned to "normal" display, it
>>would be fine again.  But when you hit just the right key combination to
>>start with, it would go through this bizarre pattern of garbage on the display
>>and eventually settle down into a garbage pattern that alternated on every
>>second.  Ha!  How many other people have discovered bugs in their wathces? :-)
>
>(raising my hand) I've encountered this.

This reminds me of my old Citizen Seven watch (with analog LC display).
It had a small lamp to lit the display when you push the correct button
(not too uncommon, no).  Instead of simply putting a switch in series
with the lamp some clever engineer had decided to run the signal through
the chip (btw, do they use microprocessors in watches or just some custom
logic IC's?).  There was a small delay of maybe 500 msec built in the IC
so if you pressed the light button for a short period of time the lamp
was turned on for 500 msec at least.

Well, everything worked just fine until the battery got somewhat
exhausted.  When you pressed the light button the lamp would turn on
 - and the batter voltage dropped much enough to stop the crystal-based
oscillator - which in turn stopped the 500 msec delay and left the lamp
turned on indefinitely.  Only when the voltage dropped below, say, 0.5V
would the transistor driving the lamp turn off.  After some time, the
oscillator would come up again and the watch was running until the next
time you occasionally pressed the light button... :-)

The later Citizen watches don't have this 'feature'.

  Jukka Marin

-- 

| Mail: Jukka Marin           | E-Mail: jmarin@messi@uku.fi                |
|       Metsurintie 17 B 8    |         There's God above computers -      |
|       70150 Kuopio, FINLAND |                       Love beyond the hate |
From: kent@cc.tut.fi (Kentt{l{ Marko)
Newsgroups: sci.electronics
Subject: Yamaha V9939 available from any other manufacturer ???
Date: 8 Apr 92 09:38:59 GMT
Organization: Tampere University of Technology, Finland


I`m planning to change my TI TMS9928 VDP with a Yamaha V9939 but I don`t
seem to find it anywhere here. So is there any other manufacturer for
9939 or any other chip compatible with 9928 (I already know 9918A is one) ?

Thanks, Make


-- 
.............................................................................
: MAKE MY DAY : Marko Kentt{l{  TTKK/AuTek : Paununkatu 5  :    FINLAND -   :
:     or      :   kent@lehtori.cc.tut.fi   : 33700 Tampere :   THE FUNLAND  :
:   180 ov.   : MK102142@RAPOLA.cc.tut.fi  : Finland       : WITH FINLANDIA :
From: jvz@cci632.cci.com (John V. Zambito)
Newsgroups: sci.electronics
Subject: Re: LCD alphanumeric displays
Date: 7 Apr 92 20:47:13 GMT
Organization: [Computer Consoles, Inc., Rochester, NY

Mike_Diack@kcbbs.gen.nz (Mike Diack) writes:
>Question : Does anyone know of a control code to skip to the second 
>line ? - all hints appreciated

Try setting the DD RAM address to the start of the second line by:

Clear the register select bit (0).
Write C0 hex to the part.  
Then set the reg sel bit and write a character. It should
show up on the second line.

To put the DD RAM address to the start of the first line write 80 hex.

This is what I do on the 16x2 displays we use.
Newsgroups: sci.electronics
From: rubin@cis.ohio-state.edu (George Bush)
Subject: Signal to Noise Ratio Measurments ??
Originator: rubin@glockenspiel.cis.ohio-state.edu
Organization: The Ohio State University, Department of Computer and Information Science
Date: Sun, 12 Apr 1992 23:15:36 GMT

Is there a relativly easy way to measure the signal to noise ratio in 
audio singal processors?  If I have a audio preamp and want to rate its
signal to noise ratio what type of equipment is involved in doind so and
how?

Thanks for any help						- Dan


-- 
  Daniel Joseph Rubin    |  "...A good football team for the alumni, parking
rubin@cis.ohio-state.edu |  for the faculty and sex for the students."
      GO        GO       |  - President E. Gordon Gee on the three things that
    BENGALS  BUCKEYES    |  a great university president must provide.....
From: fculpepp@norfolk.vak12ed.edu (Fred W. Culpepper)
Newsgroups: sci.electronics
Subject: TESLA COIL - need help
Date: 14 Apr 92 02:38:05 GMT
Organization: Virginia's Public Education Network

My trusty old tesla coil has died after 40 years of faithful
service.  It was a vacuum tube version using a push-pull
oscillator circuit working in the range of 150 KHz.  In its
best days it was capable of a 3 to 4" arc and would light a
neon or fluorescent lamp at a distance of 4'.  The tubes used
were #10 which were last manufactured during WWII as the VT-25.
The coil measures 30" in length and 3" in diameter close-wound
with #30 wire.  I don't remember the number of turns on the
coil, I can only tell you that it took two of us an entire day to
wind that coil by hand.

Now I am trying to duplicate its display using solid state
components and I am unable to find any diagram or solid-state
device which will come anywhere near the performance of the old
coil.  If you know of any source of circuits that might do the
job would you please respond to this posting.

Thanks for any help you can provide on this question.

-- 
Fred W. Culpepper, ODU

fculpepp@norfolk.vak12ed.edu
From: clldomps@cs.ruu.nl (Louis van Dompselaar)
Newsgroups: sci.electronics
Subject: Part of SCSI drive used by other computer
Keywords: SCSI, networking?
Date: 7 Apr 92 15:40:21 GMT
Organization: Utrecht University, Dept. of Computer Science

I have two computers using a SCSI harddisk.
One of these has a space shortage, and the other is
using about 1/4 of it's disk.
Can I get a partition of this HD to be accessed by
the other computer? It doesn't have to be accessible
for it's 'own' computer anymore (In fact, that's
not even possible as they're running different filesystems).

-- 

Louis van Dompselaar      |||||  Philip Glass, when asked on religion,
clldomps@cs.ruu.nl         ||||  replied:
R.v/d Hamkade 49-bis        |||  "...my music is so very odd already
From: francis@ircam.fr (Joseph Francis)
Newsgroups: sci.electronics
Subject: Re: Color monitor problems; got a magnet near it by accident.
Date: 14 Apr 92 16:00:04 GMT
Organization: IRCAM, Paris (France)

In article <92104.115025OBL8956@TREARN.BITNET> OBL8956@TREARN.BITNET writes:
>
>   I did the same to our television once. The resulting colors were very nice,
>but they are permanent. Hopefully noone was at home. I tried to fix the problem
> quickly. I did not know degaussing at that time. So i reversed the magnet
> ( N-S ) an applied at the same point. After a few tries the screen was brand n
>ew !. At least to human eye :-)
>  I agree, this could be pure luck but it worked..

What I always do is get a nice big ALNICO magnet, and wire it on the
end of an old eggbeater. I start cranking the beater, and walk slowly
back from the screen... 

Has this worked for others? ;-)

-- 
| Le Jojo: Fresh 'n' Clean, speaking out to the way you want to live
| today; American - All American; doing, a bit so, and even more so.
From: sakari@laureline.cs.hut.fi (Sakari Aaltonen)
Newsgroups: sci.electronics
Subject: Re: Parallel and Serial Ports
Date: 7 Apr 92 16:39:19 GMT
Reply-To: sakari@niksula.hut.fi (Sakari Aaltonen)
Organization: Helsinki University of Technology, Finland

The ad you saw must have referred to the parallel (Centronics) port of a PC. 
It is normally used for interfacing to a printer, i.e., it is NORMALLY 
one-way. However, the parallel ports of most PC's are actually two-way or 
bidirectional; the direction can be changed with a switch or even software. 
That is why many sorts of devices can be and are connected to the parallel 
port: hard disks, floppy disks, LAN adapters etc.

--
-----------------------------------------------------------------------------
Sakari Aaltonen                             Helsinki University of Technology
Email: sakari@cs.hut.fi
---  You can't keep a Finn down without him getting all red in the face  ----