HDTenEightyP/NetNews huggingface dataset:
From: t923335@minyos.xx.rmit.oz.au (IronEagle)
Newsgroups: sci.electronics
Subject: Re: UNDERPOWERED HALOGEN LAMPS
Date: 9 Nov 1992 03:27:05 GMT
Organization: RMIT Computer Centre
NNTP-Posting-Host: minyos.xx.rmit.oz.au

johnh@macadam.mpce.mq.edu.au (John Haddy) writes:

>In article <27806@castle.ed.ac.uk>, cam@castle.ed.ac.uk (Chris Malcolm) writes:
>|> I have read that running halogen lamps on reduced voltage will shorten
>|> their life, the argument being that their life depends on a cycle of
>|> tungsten sublimation and redeposition which requires a certain
>|> temperature to work. However, it seems to me that at lower
>|> temperatures where it doesn't work (so well) it is not needed, i.e.,
>|> tungsten/halogens should have the same kind of life/voltage graph as
>|> ordinary vacuum tungstens.
>|> Can someone who knows confirm or deny this?

>I have a catalogue which states that a halogen lamp's life is DOUBLED if run at
>5% under voltage; and HALVED if run at 5% over.
>The down side is that light output drops by 17% for a 5% undervoltage lamp.
>These figures are for 12V tungsten halogen lamps - the ones with the inbuilt
>dichroic reflector.

>A thought:
>	There's been a lot of hoo-ha recently about the high UV content of the
>light output of these globes, due to the high operating temperatures. Does
>anybody know how much the spectrum will differ if the globe is run 5%
>undervoltage? I can't be bothered doing my own black-body radiation calculations
>(its a bit difficult when you don't have all the data :-)

On the subject of halogen and such headlamps, I can remember reading
in a publication directed at Automobiles, an article about the new
headlight's that Volvo(?) were putting out with their new range of
cars....  From memory it was a DI (Sorry, I might be an EE, but this
lost me) lamp in place of the standard QI type lamp...  the idea being
increase of intensity in some part of the UV region, supposedly
allowing an increase in the light penetrating the fog/mist, giving a
higher visibility....

Anyway, I have no idea of the point to what I just typed, but if
anyone knows any info on the 'DI" lamps, I would be interested to hear
the principles behind them...

Damien/IronEagle

>JohnH

-- 
 ############################################################
 ##  Never assume the obvious, as it is rarely the truth!  ##
 ##t923335@minyos.xx.rmit.oz.au Iron@Eagle.aero.rmit.edu.au##
 ############################################################
Newsgroups: sci.electronics
From: peny@ppc.lpc.ethz.ch (Peter Nyffeler ,x4399)
Subject: Re: Creating sci.semiconductors
Reply-To: peny@ppc.lpc.ethz.ch
Organization: ETH-Zuerich, Physical-Chemistry-Lab. - Switzerland
Date: Tue, 10 Nov 1992 08:11:07 GMT

Realy a good idea to divide sci.electronics newsgroup into specialized newsgroup.

I would like to suggest:
	sci.electronics.components	(including semiconductors)
	sci.electronics.instrumentation	(for measuring- and research-instrumentation)

Peter Nyffeler
From: paula@nlbbs.UUCP (Paula Stockholm)
Newsgroups: sci.electronics
Subject: Television remote control units
Date: Fri, 06 Nov 92 01:09:51 GMT
Reply-To: paula@nlbbs.UUCP
Distribution: world
Organization: The Electronics Workbench


In article <1d9ka1INNmta@usenet.INS.CWRU.Edu> ah335@cleveland.Freenet.Edu writes:
 > 
 > Can someone give a technical explanation on how TV remote control
 > units operate?  I'm sure I'm not the only one who doesn't have
 > a clear technical understanding of this and would like to know.
                                -------
 >
                               M A G I C !
 >
From: slmdj@cc.usu.edu
Newsgroups: sci.electronics
Subject: Re: Home made personal handheld stun-gun projects?
Date: 10 Nov 92 11:46:29 MDT
Organization: Utah State University

In article <1djos5INNsjo@usenet.INS.CWRU.Edu>, ah335@cleveland.Freenet.Edu (Richard Banks) writes:
> 
> Has anyone out there ever attempted and/or completed a home made
> stun-gun device of any type?  I'm very interested in this and
> I have some ideas, but I wanted to first hear from someone
> who has done this before.  It would seem rather simple to make
> a cheap effective stun-gun.
> 


Take a look at the book 'Build your own laser, phaser, ion ray gun' by Robert
Iannini...6th ed. I believe.  I noticed several projects in that book dealing 
with stun-guns, tasers, ultrasonic guns (for incapacitating people/dogs, etc...)
Perhaps this might give you some more ideas/schematics, etc...

Paul Cowley
EE Undergrad Extrordinaire
slmdj@cc.usu.edu

Newsgroups: sci.electronics
From: mxd7977@ultb.isc.rit.edu (ELECTRONIC MUSICIAN)
Subject: Clock signal generator
Originator: mxd7977@ultb
Organization: Rochester Institute of Technology
Date: Thu, 12 Nov 1992 20:35:04 GMT

I am trying to construct a circuit that will provide a multistable
vibrator type signal given an impulse signal...

Let me explain why I am trying to accomplish this.  I have an old
Analog Synth (A Roland SH-101) that I am trying to sync to the rest of
my midi studio.  The 101 has an external clock input which I can use to
sync it's internal sequencer with the rest of my setup.  To build a
MIDI->Clock circuit is a much greater undertaking in both time and
expense than what I am trying to accomplish.  While rummaging through my
studio the other day, a thought occurred to me, I also own a Roland
TR-505 drum machine.  Although this machine doesn't have any sync
outputs or anything, it does have a little led on it that blinks on (i
believe) every other quarter note (half notes). Ideally, what I would
like to do is use this led to create a clock signal, but expand the
signal so that it is a multivibrator during the time it isn't on.  With
four years of Computer Engineering under my belt, my brain tells me that
this is not possible without some sophisticated software with out any
slew...the reason I say this is this is how the signal looks:

      |--------|    	                |
      |        |                        |
      | <-t1-> |      <-  t2  ->        |  etc...
      |        |                        |
      |        |                        |
-------        -------------------------|

Where t1 is always the same value regardless of tempo but where t2
varies according to tempo.  In other words, unless I use this straight
signal and invert it and feed the 101 with that there is no way I can
get a reliable clock signal to the 101.  

	The other thing I was thinking about was if I could either find
where the led circuitry was I might be able to increase the rate at
which it blinked or even more simply directly feed the clock signal from
the chip (The clock signal for the tempo generation not the clock signal
Of the circuit), I could reduce the frequency of it to a usable form.
From what I saw of the 505 inside, it looks like a lot of pre-fab
micro-controllers which would be what one would most likely expect in a
product which was mass produced.  Anybody have any tips in dealing with
these types of beasts.  I presume that although the majority of the
hardware is probably the DAC and memory (it is one of the first sampled
drum machines) there is probably a section dedicated to tempo
generation.  BTW It is quite possible for me to slave my studio to the
clock of the drum machine, so this is another reason, why it would be
beneficial to find the clock generator.

Any comments or suggestions welcome

Regards,
EM


Newsgroups: sci.electronics
From: jonas@world.std.com (Jonas R Klein)
Subject: Motor controller help wanted
Organization: The World Public Access UNIX, Brookline, MA
Date: Sat, 7 Nov 1992 20:27:48 GMT

I need to control 18 motors from a computer.  What's the easiest
way to do this?  right now I'm planning to use four transistors for
each motor:
       
       +5V-----------------------
             |c          |
----     b |/            \|
LS  |------|  NPN         |---- LSTTL
TTL |      |\e
----         |           |
             |___Motor___|
             |c          |            
----     b |/            \|           
LS  |--vv--|  NPN         |-vv-- LSTTL 
TTL |      |\e           /|             
----         |           |            
          ___|___________|___GND


The motors are small, and I'm using 2n2222 style transistors form Radio
Shack, since they're cheap and easy to get, but I still need 72 of them
and a lot of wire.  Can I do this more easilly from a bipolar supply?
How does everyone alse do it? I haven't beena able to find many circuits
that do this.

Thanks,
+Jonas Klein
 jonas@world.std.com
From: cces@ecf.toronto.edu (Congress of Can Eng Students)
Newsgroups: sci.electronics
Subject: Filtor Design Software
Date: 5 Nov 92 16:34:03 GMT
Article-I.D.: ecf.Bx94or.GH2
Organization: University of Toronto, Engineering Computing Facility

Does anyone know if there is a public domain (or relatively cheap) software
package (for a PC) that aids in the design of filters?

Something that allows the plotting of characteristic functions and attenuation
plots, as well as filter optimization and the such.  Also, being able to 
specify the passbands/stopbands, and the filter order and having the program
find a best approximation of the system would be a great asset.

Does such a beast exist?

Thanks for your time...

Brian Campanotti
cces@ecf.utoronto.ca

-- 
 ________________________ __________________________ _________________________
/ Brian Campanotti       |                          |"Got a mortgage on my    \ 
| Electrical Engineering | cces@ecf.utoronto.ca     | body and a lein on my    |
| University of Toronto  | campano@ecf.utoronto.ca  | soul..."                 |
From: U60901@uicvm.uic.edu (Andrea Sterbini)
Newsgroups: sci.electronics
Subject: Re: Inertial platform
Date: 11 Nov 92 19:07:25 GMT
Article-I.D.: uicvm.92316.130725U60901
 <1992Nov3.210154.15503@lamont.ldgo.columbia.edu>
Organization: University of Illinois at Chicago

In article <1992Nov3.210154.15503@lamont.ldgo.columbia.edu>,
dale@ldgo.columbia.edu (dale) says:
>
>In article <Bx0rxx.5Mn@zoo.toronto.edu>, henry@zoo.toronto.edu (Henry Spencer)
>writes:
>> In article <92301.100823U60901@uicvm.uic.edu> Andrea Sterbini
><U60901@uicvm.uic.edu> writes:
>> >I'm searching for a portable inertial platform, that can record the path
>and
>> >thath can be connected to a computer for data analysis.
>>
>> You left out the crucial requirements:  how accurate does it have to be,
>> and for how long?

The problem I want to solve is to take a topographic map of a cave.
The inertial platform must be sufficently light to be hand-carried, it's
possible to reset the platform every few minutes as a caver can put the
object on the ground.

Obviously the budget is the more important constraint, I think that 1000$
is the maximum price I can afford.

I you have any information that I can use, let me know.
                             Andrea
Newsgroups: sci.electronics
From: ch@eiaut2.tuwien.ac.at (Christian Kral)
Subject: Re: Phone line monitor
Organization: Technical University Vienna, AUSTRIA
Date: Mon, 9 Nov 1992 12:32:37 GMT

Here are my improvements. Easy, cheap and powerfull:

Add an rectifier to the input lines. This prevents from any damages due
to wrong connection. Just connect the AC-inputs to the line and
"+"-output to "Phone+" the "-"-output to "Phone-". Add an simple Diode
from pin 5 in the picture to the +9V point facing the battery (the
marker ring should point at the bat.). This will help against CMOS
overload problems.

                                                            +9V
                                                             |
Phone+   -----+                                              |+
              |                                             LED
              R 2.7Mohm                                      |-
              |                                              |
              |                                              R 680 ohms
              |         5 |\ 4          3 |\ 2               |
              +-----------| >o------+-----| >o---------------+
              |           |/ 4049   |     |/ 4049            |
              |                     |                        |
              |                     |                        |
              R 0.56Mohm            |  14 |\ 15              |
              |                     +-----| >o---------------+
Phone-  ------+                           |/ 4049
              |
              |
             GND


By the way.....

In his article Roger writes:

>
> Voltage going into pin 4 of 4049 is:
>

this should mean:

Voltage going into pin 5 of 4049 is:

That's it!

Christian.


Newsgroups: sci.electronics
From: bomr@erich.triumf.ca (Rod Nussbaumer)
Newsgroups: sci.electronics
Subject: Re: 68HC11 Floating Point Routines
Date: 8 Nov 92 15:14:00 GMT
Article-I.D.: erich.8NOV199207140323
Distribution: world
Organization: TRIUMF: Tri-University Meson Facility
NNTP-Posting-Host: erich.triumf.ca
News-Software: VAX/VMS VNEWS 1.41

In article <BxDpBv.JyH@news.cso.uiuc.edu>, rg9538@ehsn2.cen.uiuc.edu (Ronald E Garnett) writes...
> 
> 
>Help!  I'm looking for a library of assembly routines for floating point.
>I don't have time to write them myself.  I have access to a C compiler
> 
>Ron Garnett
> 
	Motorola did have a BBS with a floating point library for
	the 'HC11 a few years back.  Sorry I don't have the number
	anymore.  Maybe someone else can provide that.  They also had
	a few other useful 68HC11 things there.
	Good luck.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Rod Nussbaumer, Programmer/Technologist       Bitnet: BOMR@TRIUMFER
  TRIUMF --- University of British Columbia,  Internet: bomr@erich.triumf.ca
  Vancouver, BC, Canada.                         Phone: (604)222-1047 ext 510
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Xref: sparky sci.electronics:18358 misc.forsale.computers.pc-clone:603 misc.forsale.computers.d:274
From: muh@physics.Berkeley.EDU (Yury M. Mukharsky)
Newsgroups: sci.electronics,misc.forsale.computers.pc-clone,misc.forsale.computers.d
Subject: Re: 486 CPU KOOLERS FOR SALE
Date: 5 Nov 1992 12:01:28 GMT
Organization: University of California, Berkeley
NNTP-Posting-Host: physics.berkeley.edu

I did not followed the thread closely, but it seems to be about usefulness
of CPU coolers. 

My $0.02: We have 486-50mHz no-brand computer (I'm too lazy to open the
case to see who is the manufacture of the MB). It had problems, namely
it would crash, espessially in turbo mode and when using high memory.

All this went away the instant we installed cooler: small fan with heat
sink type.

Yury
From: karol+@pitt.edu (Filip M. Gieszczykiewicz (fmgst+@pitt.edu))
Newsgroups: sci.electronics
Subject: Re: IR detector tube wanted
Date: 6 Nov 92 19:07:41 GMT
Followup-To: sci.electronics
Organization: University of Pittsburgh


	PLEASE REPLY TO "fmgst+@pitt.edu" NOT TO THIS ACCOUNT.

In article <Bx8soG.BrD@melpar> you write:
>I assume you're referring to image intensifier tubes (aka microchannel
>plates or MCP's), since these are the only imaging tube in common use
>that preserves geometric information.
>
>New tubes run arount $1.5K plus, but you can pick up used ones for circa
>$800 from an outfit called MWK incorporated.  These tubes have a built in
>power supply (give 'em 3 volts and you're in business), but they ARE used,
>and MCP's tend to have limited lifetimes (on the order of 500 to several
>thousand hours).

	Greetings. While this is true... I see an ad for another
	company that has these MUCH cheaper (this is from Radio
	Electronics mag) the Company is:

	OATLY ELECTRONICS
	5 Lansdowne Parade, Oatley
	Sydney NSW Australia 2223

	"Total cost for Insurance & air mail is $20 for one or
	as many of the following items" They take plastic.

	(small ad - only 3 pictures/items)

	1) Visible Laser Diode head. 5mW/670nM for $99
	   for another $10 they'll sell a PCB, plans, & parts
	   for a constant current PS (pulse and cont)

	2) "Infa-red Night viewer bargain" 5" long, all lenses,
	will focus from 4" to infinity... response 600-1300 nM
	include PS kit, case, & cables. also comes with a 3" IR
	filter for torch... can get EHT PS for $25
	Price		$189

	3) "Second generation tubes" 18mm fiber-optic coupled
	 tubes. Used, military, some blemishes, but WORKS very well.
	...produces picture with starlight...requires 3V battery
	and switch to work...No lenses included (or so it seems)
	but plastic lenses may be use. Price $450 for tube & specs.

	I have no connections but #2 looks MIGHTY good! :-)

	Take care.

	P.S. It says that the EHT (#2's) PS can drive any "older
	prefocussed tubes and will even drive tubes like the
	6032/A. Instructions provided..."
-- 
-------------------------------------------------------------------------------
DO NOT REPLY HERE. REPLY TO "fmgst+@pitt.edu". THANK YOU. If that doesn't work,
send that e-mail to "fmg@alpha.smi.med.pitt.edu". Proud co-owner of a Jeanie's
Teenie serial# 1: all-Al, 285lb, low-wing, 53 hp, 120 knts, experimental plane!!
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: Serial to paralle com
Date: 11 Nov 92 02:14:54 GMT
Article-I.D.: toz.gate.kRy2TB1w165w
X-Maildoor: WaflineMail 1.00r


    Mhussai@cms.cc.wayne.edu entitled a message as 'Serial to paralle communi',
   on the 11-06-92  21:11 to All.
 Mh> Hello:
 Mh> I am trying to build a seriall to parallel converter. Can anyone
 Mh> suggest some information on it such as books, articles or personal
 Mh> experience. Thanks.


    Well there are several TTL and CMOS parts that do this
    already.  Anything in particular that you are doing?

    Cyberman
--- Blue Wave/QWK v2.10
From: slmdj@cc.usu.edu
Newsgroups: sci.electronics
Subject: RS Part numbers for 'large' toroids
Date: 10 Nov 92 10:43:41 MDT
Organization: Utah State University

In article <1992Nov05.202945.26916@bnr.ca>, grier@bnr.ca (Brian Grier) writes: 
> If the interference is being transmitted via the airways then you are
> probably in a bit of trouble. However is the noise is being transmitted
> via the power lines you may be in luck. Try wrapping the power lines
> from your CD player and TV around a toroid. Six or seven turns will
> clean up most common mode noise. The toroids are available at Radio
> Shack, and cost around $15 for a pack of four.

Just a dumb question, but dince I have been having problems with my cordless
phone picking up EMI through the power line, I might as well ask it! :)
I have seen small toroids (enough for 1-2 turns, and that is currently what I
am using, [to little avail.]) Since I don't get RS's catalogs, what is the RS 
part number for the larger toroids?

THANKS,

Paul Cowley
EE Undergrad Extrordinaire
slmdj@cc.usu.edu
From: barker@wd0gol.WD0GOL.MN.ORG (Bob Barker)
Newsgroups: sci.electronics
Subject: CCD camera questions
Date: 12 Nov 92 08:46:46 GMT
Organization: Robert Barker & Associates, Eden Prairie, MN.

I have a couple of questions about the latest generation of CCD cameras
and I'm hoping someone can enlighten me.

The first question deals with auto-focus.  It used to be that cam-corders
that had auto-focus also had a lens that was visibly turning any time
the distance to the focal object changed.  Now, with the new and even
smaller cameras, you often don't see this.  Is the lens just smaller and
internal or is some non-mechanical means used to focus.  The manual to
my new Sony cam-corder says something to the effect that the camera
focuses by maximizing the difference in light intensity between adjacent
pixels.  I guess this makes sense - a blury picuture would have the
light more dispursed between pixels, and a sharp picture would have
higher contrast between pixels.  If a non-mechanical method is used to
focus, does anyone have any more details?

The second CCD camera question deals with the CCD's response to IR.
What is the response curve of a CCD camera?  How quickly does the CCD's
sensitivity taper off as the frequency of the light drops below visible
and into IR?   And how come I can see the IR on my monitor/view-finder?
(try pointing your TV remote at the cam-corder).  My potential application
is a pseudo-night-vision device.

Inquiring minds want to know!  Thanks!

-Bob
------------------------------------------------------------------------------
Bob Barker                                ...!uunet!umn-cs!tcnet!wd0gol!barker
Robert Barker & Associates                                barker@wd0gol.MN.ORG
(612) 949-0140
Newsgroups: sci.electronics
From: schulkow@tophat2 (Diane Schulkowski)
Subject: police laser radar
Organization: Motorola Inc., Cellular Infrastructure Group
Distribution: usa
Date: Thu, 12 Nov 1992 22:57:37 GMT


Does anyone know what fequencies the police are using for their speed  
detecting lasers?

I understand that the power is ~ 2 mW.

Please e-mail any responses.

Thanks.


Diane Schulkowski
email: schulkow@rtsg.mot.com
From: mruddick@joule.elee.calpoly.edu (Michael Ruddick)
Newsgroups: sci.electronics
Subject: Re: Op amp configuration question
Date: 5 Nov 92 04:37:24 GMT
Organization: Cal Poly, San Luis Obispo

Be careful...you should only have to use one op-amp for what you are doing.
It sounds like you want the op-amp to amplify your signal as much as
it can, then pass it to another one that does the same thing.  Op-amps
don't work like that...just use a standard non-inverting op-amp configuration
and set your gain...if you set it too high, then the output will just switch
back and forth between the two supply voltage rails --> high amounts of
distortion!
From: harkcom@spinach.pa.yokogawa.co.jp (Alton Harkcom)
Newsgroups: sci.electronics
Subject: Re: Big Brother Radio Shack
Date: 6 Nov 92 00:19:19 GMT
Organization: Yokogawa Electric Corporation, Tokyo, Japan
In-reply-to: billg@bony1.bony.com's message of 30 Oct 92 15:00:34 GMT

In article <1992Oct30.150034.15841@bony1.bony.com> billg@bony1.bony.com
   (Bill Gripp) writes:

 =}If you feel as I do that your phone number is something private, that
 =}it's none of RS's business (or other similarly nosey companies), just
 =}tell 'em you don't have one.

   Lying to protect ones belief in one's rights.  Do we have a politician
in our midsts? :)
Newsgroups: sci.electronics,sci.physics,news.admin.misc
From: sehari@iastate.edu (Babak Sehari)
Subject: Creating sci.semiconductors
Originator: sehari@class1.iastate.edu
Organization: Iowa State University of Science and Technology, Ames, Iowa.
Date: Mon, 9 Nov 1992 16:57:59 GMT

----
Due to the fact that articles about the world of solid state and 
semiconductors gets lost in between the other physics and electronics
news, I suggest a new network wild newsgroup to be created as
sci.semiconductors&quantum_electronics.

Anybody has any comments or knows how to go about creating this news group?

                       With highest regards,
                            Babak   Sehari.
--
From: slmdj@cc.usu.edu
Newsgroups: sci.electronics
Subject: Re: COAX CABLE
Date: 10 Nov 92 12:07:40 MDT
Distribution: usa
Organization: Utah State University

In article <9NOV199217061048@jetson.uh.edu>, phys58@jetson.uh.edu (Hortvet, Douglas Richard) writes:
> Can someone provide a brief overview of the various applications for the 
> different varieties of coax cable. In particular, what cable specifications
> are recommended for tv antenna connections, cable tv connections, and other
> consumer applications.
> 
> Is there a good general reference for electronic component characteristics,
> application recommendations, etc?
> 
> Any information will be appreciated.
> 
> Thanks.
> 

...may not be exactly what you're looking for, but it is an idea... Try the 
ARRL handbook's appendices.  They have the best references for many cables/
components/etc... in the back of the book!


Paul Cowley
EE Undergrad Extrordinaire
slmdj@cc.usu.edu