HDTenEightyP/NetNews huggingface dataset:
Newsgroups: sci.electronics
Subject: Re: mc68hc705k1 Ocsillator modes?
From: provo_b@kosmos.wcc.govt.nz (Bart)
Date: 25 Dec 1992 10:15:58 GMT
Reply-To: provo_b@kosmos.wcc.govt.nz
Organization: Wellington City Council (Public Access), Wgtn, Nz
NNTP-Posting-Host: kosmos.wcc.govt.nz

In article <1992Dec23.220244.10435@ee.ubc.ca>, jmorriso@ee.ubc.ca (John Paul Morrison) writes:
>
>The MC68hc705k1 has five methods for setting up oscillation,
>but I can't find accuracies fro two of them. [RC 2 & 3 pin oscillator]

>if it can gaurantee less than 5% error (approx) then it might be useable

There will be temperature and power supply affects on RC osc. frequencies, 
the data book {page 1-8} notes that the 3 pin RC oscillator is more stable
than the 2 pin option.  Table 12.5, page 12-7 notes the worst case freq.
stabilities for the **internal** circuits  EXCLUDING the tolerances of the 
external R & C components.

Your 5% error is not clear as to whether it is absolute, (in which case you
must RC tune or use a crystal or ceramic resonator), or a long term stability 
requirement.  If a stability requirement then your design is limited by the
Vcc stability and the ambient temperature range which the circuit will 
experience.  Low temp coefficient resistors is no problem, however low temp.
coefficient capacitors are not so easy - check your component supplier data
sheets, I can't recall off-hand the type that has the lowest temp. coeff.

For a low production quantity of 20-30 (that you mentioned), probably much
more cost effective to use crystals, as to use RC oscillator should require
considerable effort in testing the frequency stability over the range of
Vcc and temperature [and for a sample of chips!].

If the temp coefficients of the HC705 and the external components can cancel
each other out to some degree then this may be the way to go.

I personally would use Xtal or ceramic resonators where accurate timing was
needed, especially as a preset resistor calibration step is avoided.

PS The data reference is the MC68HC705K1/D book that came with the KICS
K series in circuit simulator kit.

Hope this helps, regards, Bart.
From: geoyunk@sys6626.bison.mb.ca (George Yunk)
Newsgroups: sci.electronics
Subject: VCR repair
Date: Wed, 30 Dec 92 15:14:02 CST
Organization: System 6626 BBS, Winnipeg Manitoba Canada

 
I could use a book or two on VCR rapairs. Where can I get one and how 
much would it cost?
 
Newsgroups: sci.electronics
From: dlowe@world.std.com (Miller Lowe)
Subject: RS-422 reference wanted!
Summary: I am looking for a text file that explains RS-422 communications.
Keywords: rs-422, help, info, wanted
Organization: The World Public Access UNIX, Brookline, MA
Date: Sat, 2 Jan 1993 06:46:42 GMT

Does anyone know of a reference on RS-422 communications specifications? 
I am required to link to a rs-422 port and quite frankly have never used
one before.  I know that I can probably find a book that details this 
nicely but I would rather grab a file from an ftp site of somthing like
that.

Any help would be greatly appricated.

Thanks in advance...

D. Miller Lowe
Electronics Engineer
dlowe@world.std.com

Newsgroups: sci.electronics
From: andy@laguna.santafe.edu (Andy Mell)
Subject: Re: lasers/collimated light i
Date: Sat, 02 Jan 93 01:36:37 GMT
Organization: Santa Fe Institute
Distribution: sci

In article <1993Jan1.4265.27388@dosgate> "glen mead" <glen.mead@canrem.com> writes:
>andy@laguna.santafe.edu (Andy Mell) writes:
>
>AM>I just went to have a look on the side of my emulator, it is made by
>AM>Lightwave research, Austin, TX, USA. I dont have  a full address, but yo
>
>So you have one of these units yourself?  What do you use it for?  Have
>you ever opened it up?  I'm curious about how hard it would be to build
>one of these units?

We use it for the Uni Students Union, in discos, live bands etc. Its not
owned by me personlly, so I guess you could call it professional use.

No, I've never opened it up, and Im not about to, but I believe it uses laser
galvonometers to direct the beam. I somehow doubt that you can build one
yourself for a reasonable amount as they are precision engineering, the 
emulator controller is a custom computer (i960 or something) It is about
a metre long and 40 cm wide by 30cm high.

-- 
-------------------------------------------------------------------------------
Andy Mell, Applied Physics Department,  |   andy@santafe.edu
University of Hull, Hull, HU7 6RX       |   amell@nyx.cs.du.edu
England.                                |   torq@gnu.ai.mit.edu
Newsgroups: sci.electronics
From: jmorriso@ee.ubc.ca (John Paul Morrison)
Subject: Re: Yet Another Descrambler Question...
Organization: University of BC, Electrical Engineering
Date: Thu, 31 Dec 1992 06:53:14 GMT

In article <athos-301292211047@kip2-34.apple.com> athos@apple.com (Rick Eames) writes:
>I recently found this newsgroup, so if I am bothering people, please be
>patient.  A friend of mine's father just had his descrambler (8 years old)
>zapped by the cable company.
>
Zapped? What do you mean? Smoke now comes out of it? Or does it just not
descramble any more? If it doesn't descramble any more, perhaps the cable
company broadcast control signals that the descrambler is designed to
listen for, and it will shut off when it receives the right code.

>How in the hell can they do this? I could understand on the new two-way
>systems, but on the old A/B one-way systems, how could they "zap" a system?

basically, certain descramblers are built to stop working if they get told
the secret-magic-auto-destruct sequence (you know, same way Capt. Picard
can lock out the helm with the right code words :-)

I don't _know_ of any that actually destroy themselves, or at least
permanently damage themselves; but they could easily do it by making
the descrambler turn on a voltage that erases all its microcode, or 
blow a fuse...

> If they can do this, how could one defeat it?

build/hack a descrambler to ignore or bypass it.
>
>******************************************************************************
>Rick Eames                               My Opinions Are My Own (not
>Apple's)
>athos@apple.com
>Don't blame me, I didn't vote for Boxer.
>******************************************************************************


-- 
__________________________________________________________________________
 John Paul Morrison                     |  
 University of British Columbia, Canada |  
 Electrical Engineering                 |   .sig file without a cause
 jmorriso@ee.ubc.ca              VE7JPM |  
________________________________________|_________________________________
From: clemon@lemsys.UUCP (Craig Lemon VE3XCL)
Newsgroups: sci.electronics
Subject: Re: Motion Sensors - how do they work ?
Date: Sun, 27 Dec 1992 12:07:13 EST
Distribution: world
Organization: Private UUCP "Twig" Node
X-Newsreader: Arn V1.00

In article <105342@bu.edu>, Rajminder Singh writes:

> Hi,
>       I was just curious to know how motion sensors work ? We have one
> installed in our lounge which turns the lights 'On' when someone enters the
> room. If someone moves in the lounge, an LED mounted on the sensor turns on
> and goes off as soon as the movement is stopped - is this a pressure
> transducer at work ?
>       
> Rajminder Singh
> 

        Also, does anyone know of a way to RF-proof motion sensors.  Being
a ham radio operator on packet, I like to leave my radio running when not
attended.  We also have a security system with IR motion sensors, and my
father works for the local Gas Company and their trucks have computers in
them.  The combination of all this results in an alarm (I'm forced to lower
my power to 0.25W and he has to make sure that the truck computer is OFF
when the system is armed).  We have reason to believe that the RF is
tripping a sensor ITSELF rather than being induced in the wire run
connecting the sensor to the control box.  Has anyone diddled with this
before?  I know this message is put together sloppily, my apologies.  This
isn't as complete a story as I'd like to post, but if someone has already
been through the same thing, they already know what I'm talking about.

PS. this is really fun with those people who have motion lights outside. 
My HT (portable) reallys drives those things wild on 440MHz.  Really makes
the people look too when a light set to detect someone standing right at
their patio door (ie. a snooper) goes off repeatedly and they can't see
anyone :-).  A side effect, not a prank I pull on purpose, BTW.

--
 Craig Lemon VE3XCL (Advanced) - Kitchener, Ontario. +1 519 741 0297
 clemon@lemsys.UUCP clemon%lemsys@xenitec.on.ca  | 1B Electrical Engineering
 TCP/IP: ve3xcl@ve3xcl.ampr.org [44.135.84.51]   |  University of Waterloo
 AX.25 Packet: ve3xcl@ve3euk.#SWON.ON.CAN.NA     | Waterloo, Ontario, CANADA
From: curt@oasys.dt.navy.mil (Curt Welch)
Newsgroups: sci.electronics
Subject: Re: Old catalogs wanted
Date: 22 Dec 92 14:41:13 GMT
Reply-To: curt@oasys.dt.navy.mil (Curt Welch)
Organization: Carderock Division, NSWC, Bethesda, MD

In sci.electronics, stanb@hpindda.cup.hp.com (Stan Boyd) writes:
>I'm looking for old ALLIED catalogs, NEWARK catalogs or the like from the
>1960's and early 1970's, for info on components of that era.  If you have
>any that you'd like to get rid of, please let me know what you have  (if you
>care to admit that you still have them around ;-).

I've got an old ALLIED catalog from around that time.  But I wasn't really
interested in getting rid of it.  If were, I would have disposed of it 20
years ago.

Is there something I can look up for you?

Curt
Newsgroups: sci.electronics
From: kgdykes@thinkage.on.ca (Ken Dykes)
Subject: 2211cp chip
Organization: Thinkage Ltd.
Date: Wed, 30 Dec 1992 02:56:51 GMT

would some kind sole Email me the pinout for the
2211cp caller-id (fsk modem) chip? (well, just a DEM chip, no MO :-) :-)

or if you are really kind, scan the datasheet and Email it to me.

i've heard the chip called xr2211 as well, so i presume there are
multiple manufacturers/sources of it.

thankx!

btw, i dont suppose any chip manufacturers have online
FTP or mail-server accessible data-sheets (images ?) available?
sure would save a lot of trees in printing & distributing real data books...

-- 
   - Ken Dykes, Thinkage Ltd., Kitchener, Ontario, Canada    [43.47N 80.52W]
         kgdykes@thinkage.on.ca   postmaster@thinkage.com   thinkage!kgdykes
         harley-request@thinkage.on.ca             kgdykes@math.uwaterloo.ca
From: apn@Apple.COM (Alex Novickis)
Newsgroups: sci.electronics
Subject: Re: Can Cable TV Descramblers really be detec from outside ???
Date: 22 Dec 92 19:51:23 GMT
Organization: Apple Computer Inc, Cupertino, CA

In article <1992Dec21.002312.27582@galileo.cc.rochester.edu> dbak@elm.lle.rochester.edu (Douglas Baker) writes:
>
>
>In our local paper there has been talk of detecting Il-legal cable TV
>descrablers from outside the home.  I can think of two possible ways
>this can be done but there may be others.
>
>        1) use a sensitive spectrum analyzer to find out which channel
>is being watched by looking at the local oscillator freq.
>
>        2) modulate a signal into the channels which aren't part of
>basic and when these pay channels are watched the signal would be
>radiated out the picture tube and detected.
>
>        If anyone knows if any of the above methods are used or how
>this is done could you reply to the net ?  I'm sure many others out
>there will be interested.

Not really related, but - I know in our area we have cable boxes
that transmit back billing information (IE - what pay-per-view stuff
you watched) on at least a daily basis. 
-- 
Alex P. Novickis, Real Time systems demi-guru.  (W)   408-862-4541
ALINK:alex.n                                    (H)   415-691-0657
UUCP:{amdahl,claris,pyramid,sun,decwrl,well,ubvax,ames}!apn@apple.com,apn@nonvon
"I think... I think it's in my basement. Let me go upstairs and check"-Escher.
Newsgroups: sci.electronics
From: gstovall@bnr.ca (Greg Stovall)
Subject: moderate priced DMM (reviews???)
Organization: Bell-Northern Research, Richardson, Tx.
Distribution: na,ca,usa
Date: Mon, 28 Dec 1992 03:22:40 GMT

I'm looking for a moderately priced DMM.  Do any of the electronics
magazines have any reviews of the offerings.  I've looked at the
Fluke 70 series II, the Fluke 10, the Kelvin 200 or Kelvin pro 400,
and the Radio Shack offerings, but I don't really know the tradeoffs
between ruggedness, accuracy, and ease of use with these models.
Other prferences also desired (Beckman, Alfa??)

Thanks!
-- 
Gregory T. Stovall                gstovall@bnr.ca
Bell-Northern Research            ESN   444-7009
Richardson, Texas, USA            (214) 684-7009
Newsgroups: sci.electronics
From: Brian.Ohern@launchpad.unc.edu (Brian Ohern)
Subject: TV shadow
Followup-To: ohernb@lonexb.rl.af.mil
Organization: University of North Carolina Extended Bulletin Board Service
Date: Mon, 28 Dec 1992 13:28:12 GMT

Can someone tell me what causes a shadow or double image on a TV?

My config:
                       Splitter(3.8db loss)
               |\      
 ANT >---------| >-----+-----> TV
               |/      |_____> Stereo

             30dB WB(50M-1G) LNA

I inserted an amp just after the antenna just so I could see channel
68(FOX,~795M) better. The VHF signals were all about 10 mv, UHF
75-100uv.  The UHF jumped to about 200mv w/the amp, VHF 1-5mv.

Long story short...  Everything worked fine until about a week ago when
a shadow appeared on channel 9 (~187M ). 

BRO'HERN  (ohernb@lonexb.rl.af.mil) brohern.oc.rl.af.mil


--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  laUNChpad.unc.edu or 152.2.22.80
Xref: sparky sci.electronics:21646 sci.energy:6464 rec.autos.tech:17186
From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 28 Dec 1992 19:55:33 GMT
Organization: HST Wide Field/Planetary Camera
Distribution: world
Reply-To: carl@SOL1.GPS.CALTECH.EDU
NNTP-Posting-Host: sol1.gps.caltech.edu

In article <72182@cup.portal.com>, Ted_Eugene_Viens@cup.portal.com writes:
>Still, I return to my original opening remark.  I have some faith in the
>engineers responsible for designing Flywheel Batteries...

Gee.  These same engineers claim that it'll take two years to make even the
prototype.  Not the sort of thing that inspires confidence in me.
--------------------------------------------------------------------------------
Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL

Disclaimer:  Hey, I understand VAXen and VMS.  That's what I get paid for.  My
understanding of astronomy is purely at the amateur level (or below).  So
unless what I'm saying is directly related to VAX/VMS, don't hold me or my
organization responsible for it.  If it IS related to VAX/VMS, you can try to
hold me responsible for it, but my organization had nothing to do with it.
From: mpaul@unlinfo.unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: 8052BASIC on Internet
Date: 22 Dec 1992 18:55:02 GMT
Organization: University of Nebraska--Lincoln	
Distribution: global
NNTP-Posting-Host: unlinfo.unl.edu

Sorry, I posted the wrong names for the 8052 basic files.  They are names
BASIC-52.ZIP and BASIC31.ZIP.  (Someone told me the second one is a 
"downsized" version to run on an 8031.)

--
paul marxhausen .... ....... ............. ............ ............ .......... 
 .. . .  . . . university of nebraska - lincoln .  . . .. . .  .. . . . . . . .
 .     .    .  .   .     .   .  .    .   .  .   .    .   .  grace .   .    .  . 
   .         .       .      .        .        .      .        .   happens .
Newsgroups: sci.electronics
Subject: Atari 5200 info wanted
From: delinck@pa621a.inland.com
Date: 21 Dec 92 11:36:48 CDT
Organization: Inland Steel Company, East Chicago, IN
Nntp-Posting-User: delinck

    Does anyone know where I can get repair information (schematics, signal
    diagrams, etc.) on the Atari 5200? Heck, I'll settle for a used Atari
    5200 if the price is cheap. I have a SNES, but they just don't put out
    games like Pac-man, Centepede, and Popeye any more. It may be a simple
    problem in the swichbox.

    Please E-mail any information.
___________________________________________________________________________
 /\  Jeff Delinck        internet: delinck@pa881a.inland.com
/||\ 
\||/ Inland Steel        "...98% of that smoke is water vapor." -anonymous
Newsgroups: sci.electronics
From: kepley@cs.unca.edu (Brad Kepley)
Subject: Re: Electronics Design Question
Organization: University of North Carolina at Asheville
Date: Thu, 31 Dec 1992 00:21:22 GMT


FPGA's or PLD's are probably not going to save you any money unless 
you count on saving significant board space.  FPGA's are particularly
expensive.  By comparing against "loadable" addresses, do you mean
permanent stored addresses or changeable address?  Anyway, a 24 bit 
address could be considered two twelve bit words and you could use
either two EPROMS (for permanent address comparison) or two RAMS.
Store the addresses as two twelve bit words in hi and low RAM/ROM and
let the hi RAM/ROM output two of the bits and the lo RAM/ROM output
the other two.  See what I mean?  It'd probably be cheaper than PLD.
Newsgroups: sci.electronics
From: iqbal@creek.eel.ufl.edu (M.Iqbal)
Subject: Re: Pulse Shaping...
Organization: University of Florida
Date: Thu, 24 Dec 92 20:12:48 GMT

In article <BzMEHo.66s@ncifcrf.gov>, digennar@fcs280s.ncifcrf.gov (Frank S. DiGennaro) writes:
|> 
|> This might be a dumb question, but here goes. If I put a sine wave of frequency
|> F into a series of N flip-flops, the output will be a square wave of frequency
|> F/2^N. How do I re-shape it back to a sine wave?
|> 

Use Low Pass Filter.


-- 

---------------------------------------------------------------------------
"If your annual income today is $50,000, you have the same buying power as
the average coal miner did in 1949, adjusted for taxes and inflation," John
Sestina, nationally recognized Certified Financial Planner;  quoted in 1987.
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---
From: ifaq570@ccwf.cc.utexas.edu (Allen Kitchen)
Newsgroups: sci.electronics
Subject: Re: lasers/collimated light i
Date: 2 Jan 93 20:00:12 GMT
Distribution: sci
Organization: The University of Texas at Austin

>>
>>AM>I just went to have a look on the side of my emulator, it is made by
>>AM>Lightwave research, Austin, TX, USA. I dont have  a full address, but yo
>>

	Lightwave Research 
	2209 West Braker Lane
	Austin Tx 78758
		(512) 832-0363


Allen Kitchen   (your handy source with the telephone book)
ifaq570@ccwf.cc.utexas.edu


Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: bob1@cos.com (Bob Blackshaw)
Subject: Re: Flywheel batteries as EV power source
Organization: Corporation for Open Systems
Date: Wed, 23 Dec 1992 20:54:05 GMT

In <72196@cup.portal.com> lordSnooty@cup.portal.com (Andrew - Palfreyman) writes:

>I wrote:
>>Re. the exploding flywheel: I was mulling on flash-filling the
>>cavity with thick-setting foam, but I imagine that the response
>>time is way too long compared with the split of the wheel.
>>Comments?

>Lydick:
>: Even if the response time weren't too long, this "foam" would merely be yet
>: another thing for the flywheel fragments to vaporize, and would almost
>: certainly only exacerbate the problem.  Why do so many people have so little
>: grasp of the amount of energy we're talking about, here?

>Arrogant prating becomes you, sweetie. Nice to see a preacher here 'bouts.

>The largest difference, in any case, between the "exploding gasoline"
>scenarios and the broken flywheel is not the energy but the instantaneous
>power - probably between 8 and 10 orders, depending.

>The energy dissipation within the volume of the container tends to zero
>for a vacuum; most of it occurs at the container walls. If one could
>spread out the volume of energy dissipation, the chances of containment
>are concomitantly higher. Despite this fact, I don't *really* think foam
>is going to do it.
> --------------------------------------------------------------------------
>| lord snooty @the giant |  Would You Like Space Potatoes With That?       |
>| poisoned electric head |              andrew_-_palfreyman@cup.portal.com |
> --------------------------------------------------------------------------

If it is any help, the last issue of IEEE Spectrum was all about EVs. As
I recall, there was an article on batteries which discussed work in
progress on flywheel batteries. It might help the discussion to look
it up.

Bob
Newsgroups: sci.electronics
From: d89-ahg@ludd.luth.se (Anders Hedberg)
Newsgroups: sci.electronics
Subject: Ethernet hardware - where can I find information ?
Date: 2 Jan 93 16:17:28 GMT
Organization: Lule} Tekniska H|gskolas Datorf|rening - Ludd

I'd love to set up a radiolink to my school, but where do I find
information about the hardware and voltage levels etc for
ethernet ?


-- 
/Anders Hedberg             d89-ahg@ludd.luth.se                  Lulea, Sweden
From: ollpau01@uctvax.uct.ac.za
Newsgroups: sci.electronics
Subject: STE Bus standard ? Information request.
Date: 28 Dec 92 18:38:10 GMT
Article-I.D.: uctvax.1992Dec28.163810.203432
Organization: University of Cape Town

Hello,

RE : STE Bus Information Request. (Standard EuroCard)

Can anyone give me any information on the STE Bus format ?

I have seen many catalogues with cards that conform to the "STE Bus"
configuration, but the same catalogues don't give any details of this
"standard"

Thanks,

Paul.
-- 
***************************************************************************
* "The grass is always greener on the other side !"                       *
*                                                                         *
* --- Paul Olley              ---  INTERNET  : OLLPAU01@UCTVAX.UCT.AC.ZA  *
* --- University of Cape Town ---  Telephone : (+27) 21 797 8190          *
* --- South Africa            ---                                         *
*                                                                         *
***************************************************************************
Newsgroups: sci.electronics
From: "glen mead" <glen.mead@canrem.com>
Subject: lasers/collimated light i
Reply-To: "glen mead" <glen.mead@canrem.com>
Organization: Canada Remote Systems
Distribution: sci
Date: 30 Dec 92 12:36:22 EST

jeh@cmkrnl.com writes:

J >Disclaimer:  I'm into VMS and WinNT internals; lasers are an occasional 
J >If you want an authoritative answer, ask on the laser hobbyists' mailing

Could you forward the subscription request address for the laser hobbyists
mailing list?  Thanks in advance, take care.

Glen Mead - RZ/RD 500 Owners Group
---
 * Amiga-Reader V2.00B * 
--
Canada Remote Systems  - Toronto, Ontario
World's Largest PCBOARD System - 416-629-7000/629-7044
Xref: sparky sci.electronics:21745 sci.energy:6505 rec.autos.tech:17260
From: dino@inqmind.bison.mb.ca (Tony stewart)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: Wed, 30 Dec 92 09:27:29 CST
Organization: The Inquiring Mind BBS  1 204 488-1607

FLYWHEELS have been used for ages on British double decker bus, I 
believe, and they have the added advantag of providing stability on 
corners.  GYRO/GENERATOR/FLYWHEEL ... but for cars it would take up a lot 
of space and not be too practical, as well as causing rotational problems 
when changing speeds due to the short wheelbase.

Tony Stewart

dino@inqmind.bison.mb.ca
The Inquiring Mind BBS, Winnipeg, Manitoba  204 488-1607
Newsgroups: sci.electronics,rec.audio