HDTenEightyP/NetNews huggingface dataset:
From: josephc@cco.caltech.edu (Joseph Chiu)
Newsgroups: sci.electronics
Subject: Re: Soundblaster voicemail help needed
Date: 19 Nov 1992 19:38:59 GMT
Organization: California Institute of Technology, Pasadena
NNTP-Posting-Host: sandman.caltech.edu
Keywords: Voice mail



If you are going to wire _anything_ to the phone system, even through the
mouthpiece, use an isolation transformer!   

Take it from a guy who have done this a couple of times...

And if you don't mind doing some additional wiring, get a FCC approved
interface unit, like Xercom's XE0002.

(Or was that Xecom?  There in the 408 area code, anyways...)


-- 
Joseph Chiu, Dept. of Computer Science, Caltech.    josephc@coil.caltech.edu
1-57 California Institute of Technology, Pasadena, CA 91126. +1 818 449 5457 
*    Now running OS/2, Windows, DOS, and UNIX (okay, well, maybe not...)   *
Newsgroups: sci.electronics
From: cgordon@vpnet.chi.il.us (gordon hlavenka)
Subject: Re: Ring Detector IC
Organization: Vpnet Public Access
Date: Mon, 23 Nov 1992 17:03:08 GMT

 uunorth!cibbs!root writes:
>... It would be nice if this IC took the phone
>line as a input and produced either a TTL level or CMOS compatible output.

Check with Motorola -- they sell "Tone Ringer IC" chips which
interface to tip and ring and drive a piezo speaker.  Their app notes
describe using these ICs as ring detectors for microcontrollers and
such.  (Sorry, don't have my Moto books here or I'd give you a part
number...)

-- 
----------------------------------------------------
Gordon S. Hlavenka           cgordon@vpnet.chi.il.us
Vote straight ticket Procrastination party Dec. 3rd!
Xref: sparky sci.electronics:19275 alt.bbs:7100
From: markey@flash.ATC.Olivetti.Com (Tim Markey)
Newsgroups: sci.electronics,alt.bbs
Subject: Radio Electronics BBS Mirror Site?
Date: 20 Nov 92 18:18:12 GMT
Followup-To: poster
Distribution: na


    Is there a mirror ftp site for the files on the Radio Electronics
    BBS?  I need a file (IRSYSTEM.ZIP) on this BBS, but I have had no
    luck getting connected.  

    TJM
From: ee154fbk@sdcc15.ucsd.edu (M)
Newsgroups: sci.electronics
Subject: Good cheap 19" racks - where 2 buy ???
Date: 17 Nov 92 10:03:34 GMT
Article-I.D.: sdcc12.41117

Need to stuff all my rackmount modules into a rack.  Anybody know of
any good sources for such things???

Thanks

ee154fbk@sdcc15.ucsd.edu
From: erik@peewee.nwc.navy.mil (Erik van Bronkhorst       Code 3814                               Phone 939-1421)
Newsgroups: sci.electronics
Subject: Re: police laser radar
Date: 17 Nov 92 20:39:08 GMT
Distribution: usa
Organization: NAVAIRWARCENWPNDIV, China Lake

In article <1992Nov17.163243.15574@col.hp.com> dag@col.hp.com (David Geiser) writes:
>> If your source is brighter than the reflection of the officer's source.
>> 
>> If they find the system on your car, say it is your garage door opener.
>
>It's not illegal to broadcast IR, yet.

Unfortunately it *is* illegal to "interfere with the duty of..." :-(
as well as probably a dozen other "catch-all" laws.  
The bottom line is, detection is already illegal in some places (for RF), 
jamming is definitely not going to fly anywhere -- *if* you get caught.

IMO "stealth" measures are probably the best defense against IR speed
measurement.
-- 
Erik van Bronkhorst KC6UUT DoD#4342585443 AMA#[classified]
"Truth is false and logic lost, now the fourth dimension is crossed..."
From: brendan@otc.otca.oz (Brendan Jones)
Newsgroups: sci.electronics
Subject: Re: Phone call charge metering ?
Date: 17 Nov 92 22:37:04 GMT

in article <1992Nov17.132208.203289@uctvax.uct.ac.za>, ollpau01@uctvax.uct.ac.za says:
> How can one detect the call charge pulses on a telephone line ?
> If the pulse is sent on the customer's line, what does it "look" like ?

In Australia, meter pulses are actually brief reversals of the line voltage
on a two wire line (ie the +ve becomes -ve wrt the other line).

Hoewver, these are not normally sent to a customer unless there is a specific
need, eg they want to rent a telephone meter from the telephone company.

A wiring change at the exchange is required to send meter pulses on a 2 wire
line, so there's no way you can detect meter pulses unless the telephone
company has agreed to send them to you.  Sorry.

-- 
Brendan Jones  | ACSnet:  brendan@otc.otca.oz.au               | This space
R&D Contractor |   UUCP:  {uunet,mcvax}!otc.otca.oz.au!brendan | for lease
Network Access |  Phone:  (02)287-3128    Fax:  (02)287-3299   | pending new
|||| OTC ||    |  Snail:  GPO Box 7000 Sydney 2001, AUSTRALIA  | .sig
From: gallant@oasys.dt.navy.mil (Robert Gallant)
Newsgroups: sci.electronics
Subject: Help with J-K Flip Flop
Date: 20 Nov 92 13:25:02 GMT
Reply-To: gallant@oasys.dt.navy.mil (Robert Gallant)
Organization: Carderock Division, NSWC, Bethesda, MD

Does anyone know the pin assignments to configure a 4027 dual J K flip
flop to be a divide by 3.

I have a diagram from a 1980 Radio Shack book but it does not seem to
work correctly. (but their circuit for div. by 2 or 4 do work).

Here's what they have for a divide by 3:

pin 1    out(Q2)
pin 2    to pin 10 (q2 to J1)
pin 3    to pin 13 to input (clock inputs)
pin 4    ground (R2)
pin 5    to pin 14 (K2 to q1)
pin 6    to pin 15 (J2 to Q1)
pin 7    ground (S2)
pin 8    ground (ground)
pin 9    ground (S1)
pin 10   [see pin 2]
pin 11   V+ (K1)
pin 12   ground (R1)
pin 13   [see pin 3]
pin 14   [see pin 5]
pin 15   [see pin 6]
pin 16   V+ (supply)

Note: q is the Q with a bar over it.

Does this look correct?

Thanks alot
Rob
gallant@oasys.dt.navy.mil
Newsgroups: sci.electronics
From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
Subject: Using big caps as computer power supply filters (?)
Organization: (this space for rent)
Date: Tue, 17 Nov 1992 16:50:23 GMT

I've got some big electrolytic caps (20000 to 60000 uf, 16 to 40 volts),
and I was thinking of putting them across the 5V and 12V power supplies
in my pc.  I would think that cap's that big would provide maybe 1
second of backup power.  Should I use some inductors or smaller
caps with these big guys (to make them safer), or are they pretty reliable
on their own (I wouldn't want them exploding inside my pc).  :)

Newsgroups: sci.electronics
From: laird@stable.ecn.purdue.edu (Kyler Laird)
Subject: telephone interface to many speakers
Organization: Purdue University Engineering Computer Network
Date: 17 Nov 92 02:28:01 GMT

I'm working on a paging module which "answers" a phone call as
soon as it arrives (before a "ring" in generated for the calling
party - quite confusing for some) and broadcasts the audio of the
caller on speakers around the building for a preset time (LS7210
digital delay - way cool).  The intent is that it can be used as
a pager, outgoing line, and incoming line in response to the page.

So far, it works beautifully feeding a Radio Shack amp/speaker
module.  (and if you call 317-463-3447 while I'm working on it,
you too will be a part of the testing...)

I haven't ever tried distributing a signal like this.  I've read
that I need to match my load (speakers) to my source (amp), but
I'd like to use a cheap standard audio amp (8 ohm) and cheap
little speakers (4 or 8 ohm).  I've seen speaker selectors with
matching circuits built in, and would like to make something
similar.  I'd like to keep it simple - resistors and transformers -
if I can.  I'd also like to be able to add more speakers and vary
the volume of each speaker (at the speaker  - parallel bus)
without redesigning much.

Any hints will be appreciated!

--kyler

P.S.  I had also thought of using phantom power to feed amps at
each location with power and audio.  It seems like this would be
way too prone to noise, though.  Also, the cost would be quite a
bit higher.
From: oususawm@Msu.oscs.montana.edu (Mark Wistey)
Newsgroups: sci.electronics
Subject: Putting 12V radio in 6V car
Date: 18 Nov 92 08:00:51 GMT
Article-I.D.: Msu.00963C65.5AB9FC20
Reply-To: oususawm@Msu.oscs.montana.edu (Mark Wistey)
Organization: Montana State University

Okay, I'm a senior in EE, and stumped.  A friend wants to put a normal
(12V) car stereo in his car, an old VW bug.  But the Bug runs with a 6V
power system.  Is there any easy way to make this happen?  

I thought at first, "Sure, just use a voltage doubler chip."  Problem:
this is a big stereo.  This guy likes bass.  Lots of current.  Then I
thought of just buying a new alternator--but that costs $$$, and
besides, all the current and future headlights would have to be replaced
with 12V parts.  (I can see the guy at the parts shop in 5 years
wondering why this @#(*~^#% car has blown the 4th headlight in a 
row. :-)  Maybe I could build my own DC-DC converter?  Sure, but I'd
rather not take the time to make a high power hack while I still have
tests to study for.  Maybe I could tap alternating-current windings
on the alternator?  I don't have a schematic.  

Any ideas?  Horror stories? :-)
					 - Mark

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Mark Wistey: oususawm@trex.oscs.montana.edu  | Bicycling, Christ-like living,
Quad E #23B, Bozeman, MT  59715  (BikeNet)   | Apple II's, Music, & Physics!
From: jblake@hprpcd.rose.hp.com (John Blake)
Date: Mon, 23 Nov 1992 20:18:43 GMT
Subject: WANTED: Microprocessor Trainer
Organization: HP Roseville Site
Newsgroups: sci.electronics

I'm in the market for a microprocessor trainer for use with home projects.
A 16-bit system is preferable, although a good 8-bit system might be okay.
Also it needs provision for breadboarding circuits and interfacing them to
the microprocessor.

If you have one that's looking for a new home, please email me the details
along with your asking price.  Email is preferred over posting, as I don't
get the opportunity to read this group frequently.

Thank you.

-John B.

*****************************************************************************
John Blake, KC6ORN                 Email:  jblake@hprtrain.rose.hp.com
Hewlett Packard Co., M.S. R3SI
8000 Foothills Blvd.               Phone:  (916) 785-4337
Roseville, CA  95747-6588
*****************************************************************************
From: an938@cleveland.Freenet.Edu (George II Lenzer)
Newsgroups: sci.electronics
Subject: Re: Need pinouts for 1 MEG x 1 bit 100 ns DRAMS
Date: 16 Nov 1992 18:18:54 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: slc4.ins.cwru.edu


	I found the info I needed.  Thank you to all who
replied.

						G II L
-- 
"I'll let you in on a little secret.
	The whole universe is totally INSANE!!!!"
						Mr. Natural

Newsgroups: sci.electronics
From: ribeiro@prl.philips.nl (ribeiro ma)
Subject: Re: CD ROM and D.A.T. Sample Rates
Organization: Philips Research Laboratories, Eindhoven, The Netherlands
Distribution: sci
Date: Mon, 16 Nov 1992 09:10:46 GMT

In article <1992Nov15.160107.15861@mtu.edu> cmwolf@mtu.edu (christopher m. wolf) writes:
>I believe CD's are sampled at 42.7kHz

Samples in the CD's are 32 bits wide (2x16 bits - stereo) and are taken at a
rate of 44.1 ksamples/sec.

The samples in the so called R-DAT are also 32 bits wide (2x16 bits - stereo) 
but the samples are taken at a rate of 48 ksamples/sec.

      Milton Ribeiro    (ribeiro@prl.philips.nl)
Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: Is there such a thing as...
Organization: Motorola Computer Group, Tempe, Az.
Date: Mon, 23 Nov 1992 17:16:23 GMT

In article <1992Nov23.075602.8573@u.washington.edu> mpark@stein.u.washington.edu (Michael Park) writes:
>I had this crazy idea that needs a whole bunch of light-
>sensitive elements lined up in a small space (like several
>hundred in about a centimeter, very approximately).  Is
>there such a thing, and how fast can it be sampled?  It
>occured to me that faxes and scanners might contain such
>a device... maybe?  All help deeply appreciated!
>
>--m

Linear photo array, liner video array, line camera, and others.
TI makes them but I don't have the numbers handy.

John

-- 
| ONE LINE NOVEL: Julie was shocked to find a stranger in bed with her, but|
|she was much more alarmed by the hugh hole now in the ceiling of her room.|
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
From: ollpau01@uctvax.uct.ac.za
Newsgroups: sci.electronics
Subject: Phone call charge metering ?
Date: 17 Nov 92 15:22:08 GMT
Article-I.D.: uctvax.1992Nov17.132208.203289
Organization: University of Cape Town

Hello All,

How can one detect the call charge pulses on a telephone line ?
If the pulse is sent on the customer's line, what does it "look" like ?

Is there a "standard" circuit that produces a TTL level pulse on detection
of the call charge pulse ?

I read somewhere that both lines are raised in potential relative to ground;
I tried some measurments relative to ground using a scope, but couldn't
find anything "obvious".

I am looking for information on 2 wire telephone lines, as some countries
have 4 wire lines etc.

If anyone has a complete diagram of a call charge (unit) meter, I'd
really appreciate a copy of the circuit diagram.

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: medin@catbyte.b30.ingr.com (Dave Medin)
Subject: Re: Is lead solder bad for me?
Reply-To: medin@catbyte.b30.ingr.com
Organization: Intergraph Corporation, Huntsville AL
Date: Wed, 18 Nov 1992 18:01:31 GMT

In article <1992Nov17.212709.6174@mcnc.org>, dpalmer@mcnc.org (W. Dev Palmer) writes:
|> I wondered the same thing when I was making tens of thousands of solder
|> joints (literally) as part of a prototype production project at a local
|> university.  I won't tell you which, but they do have a terrific men's
|> basketball team.  The occupational health office finally agreed to give
|> me a blood lead test, and found the level to be lower than the national
|> average.

I had the same test done with the same results--negative (they had to take
quite a large sample, too, which was the only hard part of the
assay).

-- 
--------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    SSD--Networking				(205) 837-1174 (h)
    Intergraph Corp.
       M/S GD3004 		Internet: medin@catbyte.b30.ingr.com
  Huntsville, AL 35894		UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)
Newsgroups: sci.electronics
From: ssave@ole.cdac.com (The Devil Reincarnate)
Subject: Re: Tracking the position of a diode in 3space
Organization: CDAC, WA
Date: Wed, 18 Nov 1992 01:02:37 GMT

In article <1durunINNc91@coyote.cs.ubc.ca> harrison@cs.ubc.ca (James Harrison) writes:
>
>We have an application for the tracking of the position of a person in
>a larger room with little or no hardware carried by the person being
>tracked.  What we would ideally like to do is know the position of the
>person in a large room (x, y).
>
>Anyone done this?  Know it can/can't be done?

  Try the IR movement detectors. A sharp enough definition would give an X-Y-Z
position if the three detectors were placed on two adjacent walls and the ceiling.

-S
>-------------------------------------------------------------------------------
>James Harrison@cs.ubc.ca           `RPCing as fast as the network will let me.'


Newsgroups: sci.electronics
From: jasa@dalton.inesc.pt (Jose Antonio Soares Augusto)
Subject: Some Books about VACUMM TUBES
Organization: INESC, Lisboa Portugal
Distribution: sci.electronics
Date: Fri, 20 Nov 1992 15:12:04 GMT


Soemeone asked info about books on the subject Vacuum Tubes (VT). Here
are some I own or know:

ARRL Handbook (1990 ed. I think): Has some information on VT but is very
concentrated. However is an excellent pratical book. The tube
applications are directed mainly to RF transmitters and Receivers, not
to Audio Applications (my main interest...).

Millman: "Vacuum-Tube and Semiconductor Electronics", McGraw-Hill, (
from late fifties). Has a very good coverage on VT theory and
applications. I bought my copy recently, an ISE edition (in Portugal)
very cheap, forgotten in a library shelf :-). I think it is, perhaps,
the one I would recomend to buy, if it was available.

Millman and Halkias: "Electronic Devices and Circuits", McGraw-Hill,
(1967). I think the ISE edition is still sold. This book has 4 or five
chapters about VT physics and applications, but less than the former
Millman book.

Spangenberg:"Fundamentals of electron devices", McGraw-Hill (late
fifties?). Very good coverage of device physics, short of
applications, but valuable (I bought my copy reasonably cheap recently...).


Ryder:"Engineering Electronics", McGraw-Hill (sixties): treats
semiconductor and VT physics and applications with emphasis on the
first type. A good book with informetion on subjects hardly found in
others (induction heating, capacitor and inductor filtering in diode
rectifiers...).


Hazen:"Exploring Electronic Devices", Saunders College (1991). The
only recent electronics book I'm aware that considers the subject. It
has a chapter (19th) called "High Power Vacuum Devices in a
Solid-State World" with about 50 pages, well written and with good
explanation. 

Other books have short chapters on VT (Gray and Searle "Electronic
Principles" from John Wiley, for example).

NOTE: I do not represent any of the Book Editors. The fact that those cited
are mainly from McGraw-Hill is because in Portugal this is the only
house with a local office in Lisbon. So, their  books are available in
the librarys (inclusive the old ISE editions I cited).

	J. Augusto

Newsgroups: sci.electronics
From: dmauch@seanews.akita.com (Daniel R. Mauch)
Subject: CY325 Control Chips
Organization: SEANEWS - Seattle Public Access News + Mail
Date: Sun, 22 Nov 1992 04:44:23 GMT

Rob, I just happened to have the Nov 1991 price list sitting next to my 
PC when I read your post. The Cy-325 lists for $75 for one or you can buy 
the maunal for $10. Ifyou buy in quantities of 5 the price drops to $60. 
Quantities of 100 sell for $35. BTW the is a kit that cybernetics makes 
for prototyping. Their address is PO Box 3000, San Gregorio CA, 94074.
Phone # is 415-726-3000 fax # is 415-726-3003.
 I have a phamplet that describes that chip. It really looks like a neat 
chip for windows!


--
[] SEANEWS [] Seattle Public Access Usenet News + Mail [] +1 206 747 NEWS []
dmauch@seanews.akita.com
From: dcg5662@hertz.njit.edu (Dave Grabowski (KxiK))
Newsgroups: sci.electronics
Subject: Re: Sega Genesis Guts And Operation...
Date: 18 Nov 92 06:50:12 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.


  After reading the first post in this thread, my roommate and I decided
to pop open a couple cartridges.. just to see what was inside. Two
questions have arisen:

  1. Exactly what is this 40-pin DIP? Too many pins for a ROM, I would
think. That's all that was in the cartridges.

  2. How come the Electronic Arts cartridges have those yellow tabs on
the sides? They can be taken out, and don't serve ANY purpose at all.

-Dave
-- 
-----------------------------------------------------------------------------
Kappa Xi Kappa - Over & Above!                         dcg5662@hertz.njit.edu
9 Sussex Ave., Newark, NJ (car theft capital USA)   70721.2222@compuserve.com
Organization: Penn State University
Date: Tue, 17 Nov 1992 12:44:39 EST
From: <GNR100@psuvm.psu.edu>
Newsgroups: sci.electronics
Subject: A/D converters (need info)

          Hi.

          I'm looking for information about connecting an A/D converter
    to a parrallel I/O port of a PC.  I only need one analog signal,
    and I am looking for recomendations as to what type of chip I should use.
    I looked in an old Digikey catalog, and I didnt really understand the
    descriptions that were given, so I guess that is what I need information
    on.
                Thanks.
                         Gordon Rogers
                         gnr100@psuvm.psu.edu

   BTW, I dont need help with how to connect it. Just in choosing the chip.
From: kurtg@drycas.club.cc.cmu.edu
Newsgroups: sci.electronics
Subject: Re: Caller ID
Date: 19 Nov 92 10:09:46 -0500
Organization: Carnegie Mellon Computer Club

In article <BxyCEn.FJ8@usenet.ucs.indiana.edu>, bacarlso@silver.ucs.indiana.edu (Brad Carlson) writes:
> I was wondering if anyone has seen any plans for Caller ID units?
> If not, anyone know of a good source for production units?  What features 
> should I look for.  Anything I should avoid?  
> 
> Thanks in advance ...
> 
> Brad

There is a company which sells a book for $20 which has all principles
and three sets of plans for ID units.  They also have several kits and
completed units for very reasonable prices.  The caveat: all of the
kits and completed units are strictly for connection to a computer with
a serial port.  They don't have stand-alone displays.  I don't know
if the plans in the book are all similarly limited.

For me, it's exactly what I want...

International Micropower Inc.
65 Palm Drive
Camarillo, CA 93010
800-992-3511

-- 
Kurt A. Geisel                        SNAIL : 65 Lambeth Dr.
Intelligent Technology Group                  Pittsburgh, PA 15241
ARPA2 : kurtg@drycas.club.cc.cmu.edu  BIX   : kgeisel
GENIE : K.GEISEL                      AIR   : NF3JTW
"I will not be pushed, filed, indexed, stamped, briefed, debriefed, or
numbered!" - The Prisoner
From: jsevinsk@digi.lonestar.org (John Sevinsky)
Newsgroups: sci.electronics
Subject: How are neon tubes made?
Date: 16 Nov 92 21:51:03 GMT
Distribution: usa
Organization: DSC Communications Corp, Plano, TX

I've been thinking about the idea of making my own neon tubes, and I have no
idea what's involved with filling the tube with neon.  Does anybody know what
kind of equipment is needed and how much it would cost?

John
jsevinsk@digi.lonestar.org
Newsgroups: sci.electronics
From: rob@dexter.psych.umn.edu (Robert Stephens)
Subject: Power, but no video
Organization: University of Minnesota
Date: Wed, 18 Nov 1992 22:53:03 GMT

I followed advice, and I replaced the flyback
transformer in my SUN monitor.  It no longer 
emits the high pitched oscillation, and the power
goes to the picture tube.  

Everything seems to be okay EXCEPT that I am
getting no picture.  I used a different monitor
and switched computers to make sure it was the monitor's
problem.  

Could someone please E-mail me some suggestions
for troubleshooting this?

Thank you in advance.

-- 
---------------------------------------------
Robert C. Stephens   rob@dexter.psych.umn.edu
---------------------------------------------
Human Factors Research Laboratory
University of Minnesota
60 Norris Hall
172 Pillsbury Dr. SE
Minneapolis, MN  55455
---------------------------------------------
Phone: (612) 626-7521     Fax: (612) 626-7496
---------------------------------------------
Newsgroups: sci.electronics