HDTenEightyP/NetNews huggingface dataset:
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics,rec.photo
Subject: Re: Lamp intensity vs. lifetime (was Re: 486 CPU KOOLERS FOR SALE)
Date: 19 Nov 1992 17:36:19 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <1992Nov17.210740.1216@adobe.com> pngai@adobe.com (Phil Ngai) writes:
>In article <1992Nov16.164101.20150@bnr.ca> mwandel@bnr.ca (Markus Wandel) writes:
>>What about photographic floodlights?  These things have expected lifetimes
>>of just 2-8 hours.  I thought if I ever use the lamps and bulbs that I have
>
>Why would you want to use those when you can now get 1.5 kilowatt
>halogen floodlights?

Because they produce slightly bluer light (3400'K instead of 3200' or 2800'),
and they produce a much more diffuse light.  Halogen lamps can be modelled
pretty much as point sources, but the photofloods (especially with a large
reflector) are much more diffuse.

The reason for the short life on photofloods (and halogens intended for
photographic use) is that they run hotter, to get a higher color temperature.
Long life and industrial bulbs run cooler than standard bulbs (and often
have a temperature even below 2800'K).
--scott

Newsgroups: sci.electronics
From: miked@syscon.rn.com (Mike DeMetz)
Subject: Re: Stepper motor ICs
Organization: Syscon Corporate Headquarters - South Bend, IN USA
Date: Thu, 19 Nov 1992 19:46:41 GMT
X-Newsreader: TIN [version 1.1 PL6]

Should have looked at all my catalogs. Marlin P. Jones has the SAA1027
@$3.95 .
From: v041v4n5@ubvmsd.cc.buffalo.edu (Syed M Aftab)
Newsgroups: sci.electronics
Subject: TRANSMITTER/RECEIVER (ULTRASONIC, RADIO FREQUENCY, INFRARED)
Keywords: CIRCUIT REQUIRED.
Date: 19 Nov 92 21:48:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41

I am trying to design a remote control garage door opener that include a 
receiver and trasnmitter. The range is 20 feet and should use a coding 
scheme. The transmitter is battery operated.

I need any help that can be given eg. data books, circuit diagrams and any 
other related material. IC chips and their #. I really appreciate any help.
From: annette@curtiss.seas.ucla.edu (Annette K. Nasif)
Newsgroups: sci.electronics
Subject: imaging systems wanted
Date: 21 Nov 92 01:09:24 GMT
Organization: SEASnet, University of California, Los Angeles


     Hello, I am looking for information about a camera (still-life, not
video) that can digitalize a picture and then have that image transmitted
to a receiver.  A name of a company or manufacturer that carries digital
cameras would be especially helpful, but I would deeply appreciate anything
you know.  Thanks!                               Annette
                                                 annette@seas.ucla.edu
Newsgroups: sci.electronics
Subject: J132 y Hitachi FET equivalent HELP!
From: news@massey.ac.nz (USENET News System)
Date: Thu, 19 Nov 92 20:19:39 GMT
Organization: DSIR, Palmerston North, New Zealand

I have been given a blown up hard disk drive. When I had a thorough look at 
this beast I found a FET with a wee hole in it. I figure that it is at least 
worth a try to try and replace this transistor to see if the drive will go 
again. Ihave found out that the FET is an HITACHI D-pack power FET and the 
code (before it got blown off) was J132 Y, Ihave rang our New Zealand agents 
it is not one they stock, it is not one they have tech info on, and if I 
wanted one I would probably have to buy 200 (damn wholesalers)

Can anybody help 

thanks in advance 

Sid
Newsgroups: sci.electronics
From: nagle@netcom.com (John Nagle)
Subject: Re: Is lead solder bad for me?
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Tue, 17 Nov 1992 20:13:24 GMT

kehoe@netcom.com (Thomas David Kehoe) writes:

>Will I get lead poisoning from breathing the smoke
>from solder?  I work next to an open window, and leave
>the soldering iron on the window sill, but when I'm
>doing close soldering work, I can't avoid breathing
>the smoke form the solder.

     Try an exhaust fan.  Hakko, a soldering equipment company, makes their
model 493 fan for just this purpose.  It's basically a powerful muffin fan in a
frame with charcoal filters mounted on a desktop stand.  It's powerful enough
that used a foot behind the work being soldered, the fumes are sucked 
sideways into the filters.  You can watch this happen, as the smoke makes
a 90 degree turn.  I'm very happy with mine; I can't smell the
smoke at all when soldering with this gadget in action.  Fry's carries
these units.  Priced around $100, which is a bit much for a fan.

					John Nagle
Newsgroups: sci.electronics
From: jecome01@orion.spd.louisville.edu (Eric Comer)
Subject: audio generator chip
Date: Sat, 21 Nov 1992 17:45:12 GMT
Organization: University of Louisville


i am looking for an audio generator chip or even just a schemtatic for audio
effects.  i need to generate the sound of a missle, an explosion, and maybe
the pinging sound heard in submarines.  thanks a head of time for any 
reponses.

Eric
-- 

--------------------------------------------------------------------------------

Eric Comer                               PHONE: (502)588-5090 or (502)588-7620
University of Louisville                 FAX:   (502)588-8890
Speed Scientific School                  E-Mail Internet:     
Electrical Engineering                    jecome01@starbase.spd.louisville.edu
                                         E-Mail Bitnet:
			                  jecome01@ulkyvx.bitnet

--------------------------------------------------------------------------------
Newsgroups: sci.electronics
From: cdmorgan@unccsun.uncc.edu (Charles D Morgan)
Subject: Re: Mail order succes story
Organization: University of NC at Charlotte
Date: Wed, 18 Nov 1992 19:00:15 GMT

 GMT
Reply-To: cdmorgan@unccsun.uncc.edu (Charles D Morgan)
Organization: University of NC at Charlotte
Subject
Keywords: 

All eleIn article <1992Nov17.100324.60915@cc.usu.edu>, slmdj@cc.usu.edu writes:
|> In article <iowauB1w165w@vector0.SAC.CA.US>, jon@vector0.SAC.CA.US 
(Dazed N. Confused) writes:
|> > 
|> >> In article <BxBzJK.BqK@news.udel.edu> bew@brahms.udel.edu (Ben
Williams) writ
|> >> 
|> >>    I've just read this thread containing 50+ complaints about
Radio Shack.
|> >>    What I would like to know is:  Why do we have to shop at RS to
get
|> >>    electronic supplies?
|> > 
|> > 
|> >      Let's have a list of good mail-order companies.  I know
several
|> > people around here have experience with many different companies
|> > (actually--wasn't there a list a looong time ago?)
|> > 
|> >      I've only tried DigiKey and I've been happy.  25$ minimum
order.
|> > 1-800-DIGI-KEY.
|> > 
|> > --Jon
|> > 
|> >    jon@vector0.SAC.CA.US                     Life is like a kiwi.
|> >    citrus.SAC.CA.US!vector0!jo
|> > 
|> 
|> 
|> Personally, the mail-order company I have had the best success with
is 
|> All Electronics Corp. in Van Nuys California, I believe (I don't have
one of
|> their catalogs sitting in front of me...)
|> They have provided excellent service, _very_ reasonable prices ($10
min. order,
|> $3.00 ships the order) and a very good selection of components,
equipment, 
|> etc...
|> 
|> Paul Cowley
|> slmdj@cc.usu.edu
|> EE Undergrad Extrordinaire
|> 
|> 
I have not had so much luck with all electronics. When i tried to order
items they sent back a refund because of being out of stock. Yes they do
have a large selection of components but so does many other companies
such as mouser electronics 1-800-mouser. Basically what you should do is
fill out a reader  survey card in an electronics magazine. 
This way you will have many catalogs ffrom which to find a certain part
or device and you wont have to be forced to order from one particular
company.
Newsgroups: sci.electronics
From: aduell@nyx.cs.du.edu (Tony Duell)
Subject: Re: BROKEN TUBE AMP
X-Disclaimer: Nyx is a public access Unix system run by the University
	of Denver for the Denver community.  The University has neither
	control over nor responsibility for the opinions of users.
Organization: Nyx, Public Access Unix at U. of Denver Math/CS dept.
Date: Mon, 16 Nov 92 19:56:40 GMT


Its a bad idea to run any tube (valve) amplifier without a load, as the
resultant reduction in plate (anode) current causes an increase in
screen-grid current which can damage the vavles - I've seen the screen
grids of EL84's (6AQ5???????) get red hot on an amplifier without a load
connected.
-tony 'PDP11 Hacker' Duell
ard@siva.bris.ac.uk
From: stlucas@gdwest.gd.com (Joseph St. Lucas)
Newsgroups: sci.electronics
Subject: Re: Radio Electronics BBS
Date: 16 Nov 92 18:13:52 GMT
Distribution: usa
Organization: General Dynamics Corp.

Congrats for getting a connect signal.  In my years of trying, I've gotten
nothing but busy signals every time I call.

-- 
Joe St.Lucas    stlucas@gdwest.gd.com        Standard Disclaimers Apply
General Dynamics Space Systems: our last launch ATTEMPT, Galaxy 1R, leaving
me temporarily at a loss for something witty to say in my signature.
Newsgroups: sci.electronics
From: mikes@jdc.gss.mot.com (Mike Sullivan)
Subject: IBC Milling Machine
Organization: none
Distribution: il
Date: Fri, 20 Nov 1992 18:06:59 GMT


FOR SALE: 

	Instant Board Circuits 912Plus Circuit Board Milling Machine
	============================================================
   
   o Drills and Mills traces as small as 10 mils on single or double 
     sided copper clad board.
   o Uses IBM PC or compatible for Controller.
   o Uses Standard Gerber Files for input.        
   o Includes Machine Driver and CAM Software.        
   o Includes Large Supply of Drill, Mill, and Route Bits. 
   o Tabletop Size (Aprox. 24" X 24" X 18").
   o Originally sold for $12,500.
	o Great condition.
   o Will Train.                                         

	$4000 OBO        

   Please E-mail me.

---                                                  
        Michael P. Sullivan, Senior Engineer          | mikes@jdc.gss.mot.com
        Japan Digital Cellular Subscriber             |   
        Motorola Inc., Arlington Heights, Illinois    |
From: upsetter@mcl.ucsb.edu (Jason)
Newsgroups: sci.electronics
Subject: reading magnetic stripes
Date: 20 Nov 92 10:24:37 GMT

Recently there was a post about reading magnetic stripes.  The author had
an SR&D card reader and had interfaced it to his computer.  I also have an
SR&D card reader and would like to do the same.  Could the original poster
send me more information?

I have also used a Taltek 727 card reader to read the information on track 2.
If anyone has experience with Taltek card readers, I'd like to share info. 
I would also like to get in touch with others who are interested
in magnetic stripes.

Jason		upsetter@mcl.ucsb.edu

Newsgroups: sci.electronics,rec.photo
From: jeffj@krfiny.uucp (J. Jonas)
Subject: Re: Lamp intensity vs. lifetime
Summary: different spectrum
Organization: Jeff's house of computer pieces
Date: Wed, 18 Nov 1992 19:21:47 GMT

>>In article <1992Nov16.164101.20150@bnr.ca> mwandel@bnr.ca
	(Markus Wandel) writes:
>>What about photographic floodlights?  These things have expected lifetimes
>>of just 2-8 hours.  I thought if I ever use the lamps and bulbs that I have

In article <1992Nov17.210740.1216@adobe.com> pngai@adobe.com
	(Phil Ngai) writes:
>Why would you want to use those when you can now get 1.5 kilowatt
>halogen floodlights?

I'd guess that the photographic floodlights have a more balanced
emission spectrum.  The hotter you burn the filament, the more
white light you get (black box radiation and all that jazz).
Photographers are quite fussy about lighting
since they want the true color of the subject getting to the film.
Unfortunately, there's an inverse ration of bulblife and temperature.

Stores love using halogen lamps in the window displays not only
because halogen lamps are small and trendy enough not to hide, but
the whiter, more intense, focused light makes the merchandise more
attractive and doesn't alter the color.  Regular lamps are reddish,
fluorescent lamps bluish.

PS: there's a down side to halogen lamps: they get very hot and
increase your need for air conditioning in hot weather.
Here in the east, it's getting cold so I don't mind the additional heat.
-- 
Jeffrey Jonas

jeffj@panix.com
Newsgroups: sci.electronics
From: khartman@fnalo.fnal.gov
Subject: Re: How does a clamp-on ammeter work?
Organization: Fermi National Accelerator Lab
Date: Mon, 23 Nov 1992 09:50:08 GMT
X-Posted-From: fnalo.fnal.gov
NNTP-Posting-Host: sol.ctr.columbia.edu

In article <1eckcsINNb78@uwm.edu>, ballen@convex.csd.uwm.edu (Bruce Allen) 
writes:
> The title says it all:
> "How does a clamp-on ammeter work?"
> I'm thinking about one of the gadgets used to measure the 
> current in an automobile charging circuit, for instance.
> It has a pair of thick "jaws" that encircle the lead in 
> question, and a meter that reads out the current passing 
> through the encircled region, without intrusively breaking
> or touching the wire.  Does it sense the B field?  If so, how?
> 	Thanks,
> 		B. Allen
> 
> Please reply to ballen@dirac.phys.uwm.edu



	I understand how the AC clamp-on ammeters (eg. Amprobe) work,
but could someone explain how some models can measure DC current as well.
This puzzles me, since the ammeter is basically a clamp-on transformer, with
the clamp being the core.  If the current in the wire under test doesn't 
alternate, the transformer won't work.  Am I missing something obvious here?


	Any takers?  Thanks for the info!


Ken
Newsgroups: sci.electronics
From: apelled@cix.compulink.co.uk (Adam Pelled)
Subject: Re: Rugby clock code receivers - help ?
Reply-To: apelled@cix.compulink.co.uk
Date: Thu, 19 Nov 1992 18:36:00 +0000


In article <1992Nov17.162203.17237@nessie.mcc.ac.uk>, sl@nessie.mcc.ac.uk (Stuart Lea) writes:
>Does aanyone have the address/phone no./fax no. of the Atomic clock in
>Rugby.  These are the people who transmit their highly accurate time code
>on 60 Khz

    Apparently the National Physics Laboratory controls the GPO transmitter
at Rugby. That is from an article "Time Code Receiver clock pt-1" Wireless-
World Feb 76. i don't have part 2 sadly :-( Though an add-on to the circuit
to display the date aswell appeared in June 1977, but refered to a 'self-
setting time code clock' article in August 1976. Confused ? i know i am.
    i can't find any reference to D.U.T codes. If you can find anything
more out from the Nat physics lab i'd be interested myself.

>If you haven't got an address but know what I'm talking about, could you tell
>me what the D.U.T codes are ?

    regards,
       adam.
From: davei@comp.lancs.ac.uk (Mr D Ingles)
Newsgroups: sci.electronics
Subject: composite video to RGB convertor circuit
Date: 18 Nov 92 17:53:48 GMT
Organization: Department of Computing at Lancaster University, UK.


Has anyone got any circuit diagrams that would enable a circuit to be
built to connect a video cassette recorder to a multisync monitor ?.
The video recorder has a SCART socket, but I would imagine as with most
video recorders that the RGB outputs aren't actually connected thus
forcing one to use the composite signal output.  The monitor has
RGB,Hsync,Vsync inputs.



Davei (davei@lancaster.ac.uk)
Newsgroups: sci.electronics
From: clewis@ferret.ocunix.on.ca (Chris Lewis)
Subject: Re: 12 v -> 3v, 0.6 a
Originator: clewis@bcarh1d7
Organization: foo
Date: Mon, 16 Nov 1992 19:11:46 GMT

In article <1992Nov13.005442.11157@u.washington.edu> whit@carson.u.washington.edu (John Whitmore) writes:
>In article <1992Nov12.083015.16121@bernina.ethz.ch> schaerer@isi.ethz.ch (Thomas Schaerer) writes:
>
>>If you generate a stabilized voltage with a linear-mode- or switched-
>>mode-power-supply you are never shure if the circuit goes damaged in
>>worst case. About this you must think, because a CD-Player is an
>>expensive device. You shold save your CD-Player with an additional
>>power-zener of about 3.6V and a fast-fuse in serie of it.

>	The zener might be a good idea, but the fuse isn't.  The
>LM317 is internally limited, it NEVER will blow that fuse.

Only as long as the LM317 isn't fried.  Then all bets are off.

>The LM317M would be internally limited at circa 750 mA, and
>would be more dependable than most fuses (as well as faster
>acting).  

Ie: the fuse would be a no-op.  That doesn't make it a BAD idea, just
not necessarily useful.

HOWEVER, while the LM317 may be internally limited to some
current draw, what if the 317 dies (due to a voltage spike etc.) and shorts its
input to its output? The Zener *AND* CD player will fry, because the fuse
controlling this circuit is 10A or more.  The zener won't save your buns
because there's no telling how low the drop resistance is going to be -
likely to be very low.  Unless you have a series resister (as others have
suggested) to get some of the wattage out of the regulator.

The circuit should be fused (at around 1A).  Whether the fuse is in the
input to the 317 or the output is largely irrelevant.  Putting fuses in
both places may not be a "good idea", but it wouldn't be a "bad idea"
either.

Radio installers put additional in-line fuses into car radios installations,
even tho they're already 12V and don't need the step-down.  They have a reason
for that.
Newsgroups: sci.electronics
From: ag544@yfn.ysu.edu (Erl R. Johnston)
Subject:  Towers Int. Transistor Guide ?
Organization: Youngstown State University/Youngstown Free-Net
Date: Wed, 18 Nov 1992 13:10:49 GMT


From Erl R Johnston @ The Queen's University of Belfast

e-Mail u9118543@athmail1.causeway.qub.ac.uk or on yfn
                                                ag544

--------------------------------------------------------

     Has anyone come across a copy of the Towers
international Transistor Guide on an ftp site ?
If so I would be most interested to hear about it
--
From: GNR100@psuvm.psu.edu
Newsgroups: sci.electronics
Subject: Stero from mono (I was asked to post this reply)
Date: 19 Nov 92 13:47:55 GMT
Organization: Penn State University


     Hi there!

      I posted an article asking a biout going from mono to stereo,
and I recieved this EXTREEMLY useful response.  I was asked to post it
to the net, as the sender was unable to get it through.
What follows is the reply I recived, unedited.-Gordon Rogers
                                               gnr100@psuvm.psu.edu
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Date: Wed, 18 Nov 92 22:12:39 +0100
From: tsjoit@solist.htsa.aha.nl
Posted-Date: Wed, 18 Nov 92 22:12:39 +0100
Received-Date: Wed, 18 Nov 92 22:12:39 +0100
Message-Id: <9211182112.AA29865@solist.htsa.aha.nl>
To: GNR100@psuvm.psu.edu
Subject: Re: making mono from stereo
Newsgroups: sci.electronics
Organization: Algemene Hogeschool Amsterdam, Polytechnic Institute

Hiya! you once asked wether it was possible to make stereo out a mono signal.

Well, there is a off-the-shelf IC for this job ! :-)

It's the TDA3810, in a 20-DIP package made by Philips. It requires some
small stuff resistors and capacitors and then it's able to make some sort
of 'spatial' sound very similair to stereo,... naturally, it's not as good
as the real stereo-stuff... but nevertheless a nice enhancement to dull-mono.

I haven't build it yet (no big deal really, less than 20 components on a small
PCB) I haven't got the time for it.

It also has an extra feature: It contains a SPATIAL STEREO (R) circuit to
make ordinairy stereo sound fuller... Obviously, it's a trully consumer-
electronics chip used in Philips products... It's quite cheap... here in
the Netherlands (Philips home country) it only costs around DFL 10,- which
is around US$ 5,- I guess...

Could you be so kind to forward the information I wrote above to the
sci.electronics newsgroup ? My local Unix-site seems to be a bit ill...

Well, greetings frm Holland !
From: randy@ve6bc.ampr.ab.ca (Randy Pointkoski)
Newsgroups: sci.electronics
Subject: Wanted: XC68HC711E9FS Microprocessors
Date: Wed, 18 Nov 1992 19:05:07 GMT
Organization: Dura Controls Ltd. Edmonton, Alberta


we are currently doing some development work utilizing 
the MOTOROLA XC68HC711E9FS processor chip.

this chip is the erasable on-board 12K EPROM version (windowed)

We are looking for a few chips (5-10) to continue development
until we have waited out the outragous lead time quoted to us
by our supplier.

please respond by EMAIL

Randy
-- 


Randy J. Pointkoski P.Eng.                       tel: (403) 437-5961
Edmonton, Alberta, Canada                        fax: (403) 436-1686
From: haydedr@wkuvx1.bitnet (Ross Hayden)
Newsgroups: sci.electronics
Subject: Two computer design questions
Date: 23 Nov 92 23:08:12 CST
Organization: Western Kentucky University, Bowling Green, KY

Happy Thanksgiving all!

I have a couple of questions here.  Thanks very much in advance for
any replys.

1)  Why is it that the ROM in my PC is so much slower than my RAM
memory?  That is, my read/write memory is 60ns, while my ROM is
something like 120ns.

2)  I've been trying to picture exactly how the memory in my computer
is actually accessed.  I assume I have 32 address lines coming from my
486, but do these lines go into something like a decoder with 2^32 out
lines?  I'm not an expert here, but I do seriously doubt this.  If it
gets too complicated to explain, then please let me know where I may
look for this info.

Again, thank you all for any help!
--
Ross Hayden
haydedr@wkuvx1.bitnet

What do you get when you cross Captain Picard and Dirty Harry?
A starship captain walking around saying, "Go ahead punk, make it so."
Newsgroups: sci.electronics