HDTenEightyP/NetNews huggingface dataset:
From: ljkong@cayley.uwaterloo.ca (Lennard J. Kong)
Subject: Re: 12V Power Amplifier Design
Organization: University of Waterloo
Date: Wed, 27 Jan 1993 18:09:52 GMT

In article <1993Jan27.000515.19195@parc.xerox.com> tapscott@parc.xerox.com (Peter Tapscott) writes:
>
>
>Using the equation P = V^2/R to estimate power is OK if
>the correct V is used. 
>
>I assume that the actual DC voltage is higher than 12, say 14.5
>volts, but that the 2.5 volts is needed to boas the output transistors
>of the amp, so I will use 12V to be consistant with Lennard.
>
>A sine wave must be produced to measure RMS, so its max peak-to-peak
>voltage is 12 volts. Its peak voltage is half that, 6V. The RMS voltage
>is (SQRT 2)/2 times that, or about 4.2 VRMS. I will use 4VRMS for
>simplicity. Then,
>
>P = 16/R for a 12 volt DC supply. For an 8 ohm speaker, the max
>output is only about 2 watts. Figure 4 watts for a 4 ohm speaker.
>

  This calculation seems to be correct, does this mean that all deck makers are
lying ? Since almost all decks have a rated power of about 4 - 12 rms. Some of
the so called high-power decks even boast of 25rms such as many Pioneer decks 
nowadays. I seen the insides of some of these decks, and they dont seem to have
any switching supply along with a current power step-up transformer. Also if you
look at any transitor,IC catalog such as ECG or NTE etc, there are IC's along
with the specs listed. These are the same IC's used in low power applications,
they are usually rated at about 8-12 watts using 12V directly. WOuld someone
care to further clarify this issue ? 

Newsgroups: sci.electronics
From: kcarver@dante.nmsu.edu (Kenneth Carver)
Subject: Re: Recording sound on chip
Organization: New Mexico State University, Las Cruces, NM
Date: Wed, 27 Jan 1993 16:11:41 GMT

See the article in Radio Electronics magazine, March 1992.  One chip
does it all. Your best price for the chips is direct from the
manufacturer. 

--Ken Carver


Newsgroups: sci.electronics
From: an7442@anon.penet.fi (Ren Hoek)
Subject: RE: Pulse Oximetery
Organization: Anonymous contact service
X-Anonymously-To: sci.electronics
Date: Wed, 27 Jan 1993 18:49:03 GMT

Jeff:

You are most likely correct in saying that there were two devices
in one can (or two chips in the same housing), one for 660 and
one for 925 nm.

I worked for a company that manufacured Pulse Ox's (hence the
anonymous post). ALL of our stuff had two LED's in it, and I
saw no R&D by "us" or the competition towards a 1 LED system,
ALTHOUGH I think there was a way of doing it.

I wouldn't trust any 1 LED system. 

BTW, if this hasn't been discussed before, pulse oximetry
gives the percentage of oxygenated hemoglobin in the arterial
blood vessels. A reading of over 94% is nice, less than that
MIGHT be a problem - it depends on the situation.

It gives the heath care giver a quick read on the status of 
the circulatory system. It's a much earlier sign of a problem
than blue skin is!

If you are going to have a procedure done on yourself, make
sure there is a pulse ox put on you! 

- Mr. Anonymous




-------------------------------------------------------------------------
To find out more about the anon service, send mail to help@anon.penet.fi.
Due to the double-blind system, any replies to this message will be anonymized,
and an anonymous id will be allocated automatically. You have been warned.
From: jsimpson@darmok.uoregon.edu (John Simpson)
Newsgroups: sci.electronics
Subject: Re: Help locate anemometer
Date: 27 Jan 1993 08:02:09 GMT
Organization: University of Oregon Network Services
NNTP-Posting-Host: darmok.uoregon.edu
X-Newsreader: Tin 1.1 PL4

I saw an Electronic Weather Monitor for $119 which includes an anemometer
for sale by Damark International Inc. (1-800-729-9000) in their most
recent catalog.  It's a "Digitar" brand unit, Damark's item number
B-4210-328228. I don't know if the anemometer transducer is analog or
digital, but you might give Damark a call and ask. 

--
John Simpson                        | Voice    +1-503-345-0858
                                    | Fax      +1-503-485-5712
Disclaimer:                         | CIS       74106,2203
Contents may settle during shipment | Internet  jsimpson@darmok.uoregon.edu
Newsgroups: sci.electronics
From: sivaram@hplabsz.hpl.hp.com (S. Sivaramakrishnan)
Subject: Recording sound on chip
Date: Mon, 25 Jan 1993 21:40:46 GMT
Organization: Hewlett-Packard Laboratories Palo Alto,CA
X-Newsreader: TIN [version 1.1.4 PL6]

I am looking for a cheap method to record and playback about 15 seconds of
sound on a chip.

The whole setup, I GUESS, will comprise:
1) A microphone
2) An A/D converter that digitizes the sound
3) A unit that accepts the commands "record" and "playback"
4) Some memory that holds the sound image
5) A D/A converter to generate an analog signal
6) A speaker for playback
7) Power supply

Does a chip that has most/all the features except the power supply exist?

If there is an alternative/better method I would be extremely interested to
know.

Sivaram
Newsgroups: sci.electronics
From: wiegand@rtsg.mot.com (Robert Wiegand)
Subject: Re: Mounting Large Axials
Reply-To: motcid!wiegand@uunet.uu.net
Organization: Motorola Inc., Cellular Infrastructure Group
Date: Thu, 21 Jan 1993 22:31:09 GMT

behnke@FNALF.FNAL.GOV (M.L. 'Broomen' Behnke) writes:

>In article <1993Jan20.104910.19417@actcnews.res.utc.com>, Bob.Clarke%bbs@actcnews.res.utc.com (Bob Clarke) writes:
>> We are looking for a non-adhesive method for mounting large
>> axial comp in a high vibration/shock environment.

>Here at Fermi, we typically use nylon tie-wraps to secure large axial
>components.  Requires 2 holes in the underlying surface to run the strap thru.

I assume that to do this you lie the part on its side?

-- 
------------------------------------------------------------------------------
Robert Wiegand - Motorola Inc.
motcid!wiegand@uunet.uu.net            uunet!motcid!wiegand
Disclamer: I didn't do it - I was somewhere else at the time.
From: snydert@dmapub.dma.org (Tony Snyder)
Newsgroups: sci.electronics
Subject: Re: 150 - 200 W. Amplifier
Date: 27 Jan 93 05:43:35 GMT
Organization: Dayton Microcomputer Association: Dayton, Ohio
X-Newsreader: TIN [version 1.1 PL8]

David Hinz (hinz@picard.med.ge.com) (hinz@bonfire) wrote:
: Brad Siim (siim@waterloo.hp.com) wrote:

: state-of-the-art is multi-sized wires in a non-twisted bundle, low O2 copper,
: etc. etc. etc.  OK, you might not be able to hear much, if any difference.
: But someone can.
: SAAB - Because you get what you pay for.     \       Pherrets are Phun!!

Those are the samepeople who think
spirits run down the wires.  If the O'scope doesn't see it it is not there.

let's talk SAABs.
I have a MonteCarlo 850 GT.  How about you?!
Newsgroups: sci.electronics
From: iisakkil@lk-hp-15.hut.fi (Mika Iisakkila)
Subject: Re: XILINX XC2064-50
Organization: Helsinki University of Technology, Finland
Date: 23 Jan 93 10:44:12 GMT

>Lau Hui King (doslauhk@nusunix1.nus.sg) wrote:
>: XILINX XC2064-50
>: MAX633ACPA

The Xilinx is a FPGA (field programmable gate array) chip. Read the
last 300 articles in this group to find out the best way to blow it up...
MAX633 is step-up switching voltage regulator by Maxim.

szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983) writes:
>expensive, very few people privately own them; their cost is even prohibitave
>to some corporations.

I bought my copy of IC Master second-hand for some 40 bucks (1990
edition). It's not THAT useful; for obvious reasons, it doesn't
contain the pin-outs or other detailed information for all parts
despite of the ~5000 pages. I just got an advertisement for IC Master
on CD-ROM for 2500FIM (about $500).

--
Segmented Memory Helps Structure Software
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: Re: Why no FAQ
Date: 22 Jan 93 01:30:35 GMT
Organization: The Tower of Zot - (716)8338-616

siim@waterloo.hp.com (Brad Siim) writes:

> I keep seeing the same questions every month?
> 
> PCB help
> book recomendations
> PAL help
> power supplies/regulators
> amplifiers
> PC layout package requests
> passive component questions
> equipment questions. What to buy
> protocal and IEEE standards questions
> How to prototype high speed digital/analog
> 
> And these are just the ones that have caught my attention.  There are many
> beginner type queries as well. Anybody got the time to administer a FAQ or 10
> (I'm not sure how its done but I'm sure someone has to volunteer.)
> Many of these FAQ's would be a great source of reference to a full time
> designer and to the hobbiest, but much of the information is lost because
> many of us do not have time/will to re-answer an old question. 
> 
> Brad Siim

Quit simply put this group moves far to fast, and maintaining a FAQ for 
it is quit near impossible.  Mayb SUB FAQ's .
:)

Cyberman

************************************************************
* Cyberman@TOZ.BUFFALO.NY.US                               *
*   "Life is what you put into it" - Cyberman              *
* Optimistic - running through a barn of manure looking    *
* for the horse!  /\ [] ( )                                *
From: egurney@vcd.hp.com (Ed J. Gurney)
Newsgroups: sci.electronics
Subject: MTS Stereo Decoder ICs -- any recommendations?
Summary: Looking for low-cost, easy-to-use MTS decoder IC
Keywords: MTS Stereo IC Cable Video Low-cost
Date: 26 Jan 93 21:34:13 GMT
Followup-To: poster
Organization: Hewlett-Packard VCD
X-Newsreader: TIN [version 1.1.8 PL6]

I have a ViewStar cable box with baseband video and mono audio outputs.
I'd like to add stereo outputs to the unit through an MTS decoder chip.
I've checked a couple data books, but can't find any with what I'm looking
for.  Ideally it would be something that would take the audio IF (which
hopefully is available inside the ViewStar box somewhere!) as input, and
the output of the IC would just be simple line-level audio (in stereo!).

Or:
   Audio
    IF       ::::::::::::::--->--- L audio output
 ---->-------: Mystery IC :       
 from tuner  ::::::::::::::--->--- R audio output

[I'm assuming that by the time the mono audio is generated, the MTS
information is lost.  If not, then something that would convert line-
level audio to MTS stereo would be great, too.]

In the data books I've looked at, they all seem to have outputs that then
require the signals be passed through an FM decoder, or some other
extra converter, etc.  Are there any "simple" MTS decoder chips available?
If not, a recommended "combo" would be fine.

Any info would be appreciated... I will summarize replies to the net, and
if I get the circuit working with the ViewStar, I'll post instructions so
others can do the mod -- I know there's a BIG demand for baseband video
and MTS stereo cable boxes!  (Or alternatively, a device which takes
"Channel 3 Input" and provides baseband video/stereo audio outputs.  I
asked about this on the net a couple months ago and everybody said "buy
a VCR".  I have a VCR, I don't have room for another one [even if it is
broken!]  I just want a small, low-cost "black box" that hangs off the
back of my current CATV converter so I can use the 'Aux' channel on my VCR
[read: the video input on the back] instead of having it tuned to channel
3 all the time!!  Since there were no other suggestions there, this is my 
next idea.)

So... any info on a nice, easy-to-use MTS decoder chip would be 
appreciated!  Thanks.

--
Ed J. Gurney  N8FPW   Hewlett-Packard Company   Vancouver (USA!) Division
egurney@vcd.hp.com                       #include <standard-disclaimer.h>
"Failures are divided into two classes-- those who thought and never did,
      and those who did and never thought."     John Charles Salak
Newsgroups: sci.electronics
From: hinz@bonfire (David Hinz (hinz@picard.med.ge.com))
Subject: Re: 150 - 200 W. Amplifier
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL8]
Date: Mon, 25 Jan 93 08:51:51 GMT

Brad Siim (siim@waterloo.hp.com) wrote:

: I have to agree with the first message that there is a fair bit of
: hype relating to marginal/very marginal improvements in sound quality
: due to the difference between good equipment and great equipment.  By
: equipment I am refering to $15 patch cords verses $150 patch cords,
: $1200 amps vs $6000 amps etc.  Do $5000 dollar tube amps sound that much
: better than $1000 dollar bipolar/FET amps? Or is the price being
: driven by the 'law of supply and demand' and our famous 'kinked Demand curve'?
: Charge what the market will bare??  

: Brad Siim

Yup, you're right.  Many people can't hear the difference, or it doesn't 
matter much to them.  HOWEVER....if you are into the ultimate in sound, and
really listen, you can hear the difference.  Many people have hobbies.  I
collect cars, which is expensive & takes up lots of room.  I've got friends
whose hobbies are their audio systems, which is more expensive and takes
up less room.

Maybe stamp collecting is the way to go; high cost/volume ratio.

My point is this:  You can look at all the frequency response graphs you 
want, and it isn't going to tell you how a system sounds.  Going by a purely
engineering outlook isn't going to give you a real idea about quality, because
there is stuff going on that we don't even begin to understand.  Just speaker
wire, as someone mentioned, can be quite expensive.  I think the current
state-of-the-art is multi-sized wires in a non-twisted bundle, low O2 copper,
etc. etc. etc.  OK, you might not be able to hear much, if any difference.
But someone can.

--

Dave Hinz  -  Opinions expressed are mine, not my employer's.  Obviously.
Ask me if I have an opinion on this! \ Don't blame me; I voted for Perot!
SAAB - Because you get what you pay for.     \       Pherrets are Phun!!!
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: Re: SPICE resistance sweep
Date: 24 Jan 93 15:43:25 GMT
Reply-To: michael@vk2bea.UUCP (Michael G. Katzmann)
Organization: Broadcast Sports Technology, Crofton. Maryland.

In article <1993Jan22.155040.16761@dale.ksc.nasa.gov> jsm@orion.ksc.nasa.gov (John Moerk) writes:
>Does anyone know a way to sweep a resistance value in Berkely SPICE3?  I
>used to use PSPICE, and I knew a couple ways to do it there, but none of
>them work.
>

What about a non-linear dependent source like:

Bresistor	1 	2  	i=(v(1)-v(2))/v(control)

Vcntrl		control 0	1e-10

.dc	Vcntrl	1e-10 10e3 500

* Like sweeping the resistance from ~0 to 10k in 20 steps.

the 'B' source is in (from memory) spice3c2 onwards. The latest one I have is
spice3f2.



-- 
Michael Katzmann                  >   Broadcast Sports Technology Inc.
~~~~~~~~~~~~~~~~	         <    Crofton, Maryland. U.S.A
Amateur Radio Stations:           >     
NV3Z / VK2BEA / G4NYV / AAR3VK   <    opel!vk2bea!michael@uunet.uu.net
Newsgroups: sci.electronics
From: pell@isy.liu.se (P{r Emanuelsson)
Subject: How to build a cheap, reliable comm link?
Organization: Dept of EE, University of Linkoping
Date: 20 Jan 93 21:48:32 GMT

Hi. I am currently looking at building a uni-directional 100 kbit/s link
for long distances (cable). I will probably FSK modulate a 100 MHz carrier
or something similar. I'd very much like suggestions for a chip pair to
perform the above data transfer. It has to be reliable and cost is a major
factor. I'd prefer to transmit/receive bytes of data, but a bit stream with
clock is acceptable. Also, if there are chips for performing the
abovementioned FSK (de)modulation, I'd appreciate some pointers. Will
summarize answers.

Thanks!
-- 
Dept. of Electrical Engineering	                         pell@isy.liu.se
University of Linkoping, Sweden	                    ...!uunet!isy.liu.se!pell
From: schuch@phx.mcd.mot.com (John Schuch)
Newsgroups: sci.electronics
Subject: Re: Auto "tow" sensor idea needed
Date: 26 Jan 93 15:14:45 GMT
Organization: Motorola Computer Group, Tempe, Az.

In article <43975@sdcc12.ucsd.edu> afong@sdcc13.ucsd.edu (Krell Kraver) writes:
>
> 
>I need help designing a "tow" sensor to add on to my existing car
>alarm.
> 
>The car currently has a shock sensor, but towing the car would not
>necessarily set it off... it reacts mostly to higher frequencies,
>like the car body getting hit.
> 
>I can't use an ordinary tilt sensor either, since if I park on a
>hill, it won't work!
> 

What about detecting when any of the springs are unloaded?

John


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Xref: sparky sci.electronics:23538 rec.audio:19612 rec.audio.car:5898 rec.audio.pro:2882
From: rubin@cis.ohio-state.edu (Daniel J Rubin)
Newsgroups: sci.electronics,rec.audio,rec.audio.car,rec.audio.pro
Subject: Re: 12V Power Amplifier Design
Date: 28 Jan 1993 02:17:00 -0500
Organization: The Ohio State University Dept. of Computer and Info. Science
NNTP-Posting-Host: zion.cis.ohio-state.edu

>by the alternator.  And the alternator in my car can put out only 60
>amps, and a major portion of that goes to running the cars electrical
>system, especialy when the lights are on.   What I am wondering is if
>people with these amps have dead batteries all the time...

Many monster stereo cars have several batteries and a hefty alternator.  Your
60 amp alternator is realtivly small.  You can get 200 amp altenators and they
are quit common in trucks etc. with extra lights external equipment etc...

                                                             - Dan
-- 
             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!
From: michael@vk2bea.UUCP (Michael G. Katzmann)
Newsgroups: sci.electronics
Subject: Re: Recording sound on chip
Date: 27 Jan 93 17:50:08 GMT
Reply-To: michael@vk2bea.UUCP (Michael G. Katzmann)
Organization: Broadcast Sports Technology, Crofton. Maryland.

In article <1993Jan25.214046.9622@hplabsz.hpl.hp.com> sivaram@hplabsz.hpl.hp.com (S. Sivaramakrishnan) writes:
 >I am looking for a cheap method to record and playback about 15 seconds of
 >sound on a chip.
 >
 >The whole setup, I GUESS, will comprise:
 >1) A microphone
 >2) An A/D converter that digitizes the sound
 >3) A unit that accepts the commands "record" and "playback"
 >4) Some memory that holds the sound image
 >5) A D/A converter to generate an analog signal
 >6) A speaker for playback
 >7) Power supply
 >
 
Dallas Semiconductor (214) 450-0400, have a 'speech stick' (DS2270)

	- 50 seconds of recording capacity at 8Kbps (expandable with 
								external ram)
	- selectable record/playback rates 8 to 32Kbs

	- Uses ADPCM compression/expansion algorithms for high fidelity
		record/playback

	- Digital audio level monitoring

	- Instant random access playback of recorded messages

	- programmable input/output gain for optimum record/playback levels

	- Nonvolatile SRAM retains data for 10 years

	- mates with JEDEC-standard 35-pin SIMM connectors

It is a board about 4"x1" and has just about all you need. Just add
a mic and speaker and talk to it down an 3 wire interface (clock Din Dout).

It also has a DTMF generator and reciever.

It is designed for 'tele-servicing'. i.e. You dial up your pin-ball machine
to see if it needs emptying!

Under $100 the last time I bought one.


-- 
Michael Katzmann                  >   Broadcast Sports Technology Inc.
~~~~~~~~~~~~~~~~	         <    Crofton, Maryland. U.S.A
Amateur Radio Stations:           >     
NV3Z / VK2BEA / G4NYV / AAR3VK   <    opel!vk2bea!michael@uunet.uu.net
Newsgroups: sci.electronics
From: pclink@cheops.qld.tne.oz.au (Rick)
Subject: 82780 on the 486 local bus?
Organization: Telecom Australia, TNE Computer Support Services
Date: Mon, 25 Jan 1993 00:52:38 GMT


The 82780 is an Intel support chip that provides high speed, 8 channel DMA,
20 interrupt lines, internal timers, DRAM refresh timing, and a set of steak
knives.  I would prefer to use it on a project based around a 486 rather
than Intels 82350 chipset because I don't need (want) all the extras the
chipset comes with.  However, the data sheet for the 82780 says that it's
optimized for the 386 bus, and I can't determine whether it will function
on the 486 bus.  The NA# input to the 82780 I can work around, but are the
timings on the 486 bus so different from the 386 that it precludes the use
of the 82780?  Any replies or pointers to applications notes would be
appreciated.

Thanks in advance,
Rick.
Newsgroups: sci.electronics
From: ray@ole.cdac.com (Ray Berry)
Subject: Re: Auto "tow" sensor idea needed
Organization: Cascade Design Automation
Date: Thu, 28 Jan 1993 18:02:59 GMT

<FWR100@psuvm.psu.edu> writes:

>Enough picking on other people's suggestions :-)  Here's my idea -
>Have a multi-position tilt sensor.  Basically, a pendelum that will touch one
>of several contacts depending on tilt.  Once the system is armed, the alarm
>will sound if the pendelum changes position.  Should be easy to build from
>some TTL gates - basically just a comparator and a shift register.

   These devices have been produced commercially.  I believe Alpine had such
a device, at least a few years back.  It was a 2-axis inclinometer with a 
solenoidal clutch.  The strategy is to wait for a minute or so after the
alarm is armed, and then memorize (ADC?) the inclinometer outputs.  Any
significant deviation would trigger the alarm.  Perhaps you can acquire one
of these from Alpine as a replacement part.
   A pair of low-g accelerometers would obviously serve the same purpose,
without the reliability problems of a mechanical assembly.
-- 
Ray Berry kb7ht ray@ole.cdac.com 73407.3152@compuserve.com /*inquire within*/
From: whit@carson.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Voltage drop across 1N4148 diode?
Date: 23 Jan 1993 00:27:33 GMT
Organization: University of Washington, Seattle
NNTP-Posting-Host: carson.u.washington.edu

In article <1993Jan21.101200.8651@mr.med.ge.com> szopinsk@picard.med.ge.com (Jerry Szopinski Mfg 4-6983) writes:

>The voltage drop across the 1N4148 diode depends on what type of
>semiconductor material it is made of.  If the diode is made of
>germanium (no, not the flowers) the drop is around 0.7V; if it
>is made of silicon then the drop is around 0.5V.

	Nope; for Ge diodes 0.2-0.3V is typical.  Silicon is nominally
0.6-0.7 (but this ignores resistance, which can drive either Si or
Ge devices to 1V or more).  There are, for applications where this
voltage drop is inconvenient, Schottky rectifiers that use Si and
metal (Pt is typical) instead of N-Si and P-Si, and the forward
voltage drop of these Schottky devices is usually considerably
lower (0.3V or so).  Reverse holdoff voltages for Schottky diodes
are usually modest (35V or so), which limits their application.

	LEDs are made of materials that have forward drops ranging
from 1.2V (for IR) to 2.4V (the blue LEDs).

	John Whitmore
Newsgroups: sci.electronics
From: kingpin@spiff.gnu.ai.mit.edu (Joe Smooth)
Subject: Novatel cellular phone help
Organization: None
Distribution: sci
Date: Tue, 26 Jan 1993 19:42:35 GMT

Hi I was wondering if anyone out there has a service manual for the Novatel
8320 or 8305 transportable cellular phone? If so, please let me know!
Thanks..