HDTenEightyP/NetNews huggingface dataset:
From: jeg@desktalk.desktalk.com (John E. Greene)
Subject: Re: Chirping Chick Toy, interesting novelty...
Organization: Desktalk Systems Inc.
Date: Fri, 10 Apr 1992 18:09:33 GMT

In article <pschleck.702924799@odin> pschleck@odin.unomaha.edu (Paul W Schleck KD3FU) writes:
>I was wandering through Walgreen's drug the other day, and saw an
>interesting Easter toy selling for a couple of bucks.  It's a
>fuzzy chick that chirps when you hold it in the palm of your hand.
>The woman behind the register was kind enough to demonstrate it for
>me.  Touching two metal grommets on the bottom of the thing started
>it chirping.
>
>Since skin has a very high impedance (i.e. when you touch two
>probes of a multimeter to your hand, you don't get a measurable
>amount of resistance/load), it probably detects the very slight
>difference between an infinite resistance/impedance, and the very high 
>impedance of skin (warm, oily/sweaty skin works better than cold/dry
>skin, fingertips work better than the palm of your hand, etc., etc.).
>
>Shorting the contacts with metal like copper produces unpredictable
>results (fast, irregular chirping, or no chirping at all) probably
>due to it being sensitive to too much load.
>
>I only have one of them right now (and it is already reserved as
>a present), but when I get some more (hey, if you can get over
>the embarrassment of buying SOME things at a drugstore, you can
>buy ANYTHING :-), I'll sacrifice one to science and report on its
>"guts".  It uses a standard watch battery and might be an interesting/
>educational present for the little tykes.

I have one of these that my dog did the honors of exposing the 'guts' for me.
There is some sort of custom hybrid on the circuit board covered with a gob
of epoxy.  The trigger is a single transistor with a 1 Meg resistor connected
between V+ and the collector and the input to the blob of epoxy.  The two 
metal contacts attach to the base and emitter.  Looks like one of them is 
simply grounded.  Let's see if I can show it in ascii-draw:


	_________
      /          \
      |  epoxy   +---------+---------+
s ----+   blob   |         |       +++++
p ----+          |         /       -----
e     |          |    1Meg \         |
a     |          +---------+         |
k     |          |         |         |
e     \-------+--/        /          |
r	      |          |           |
	      |     0----|           |
	      |           \          |
	      |     0------+---------+
	      |            |
 	      +------------+

-- 
John E. Greene             Everyone needs something to believe in.  I believe 
Sr. Staff Engineer         I'll have another homebrew!
Desktalk Systems Inc.      
(213) 323-5998             internet:  jeg@desktalk.desktalk.com
Xref: sparky sci.electronics:8602 rec.pyrotechnics:1847 alt.locksmithing:693
From: kolstad@cae.wisc.edu (Joel Kolstad)
Newsgroups: sci.electronics,rec.pyrotechnics,alt.locksmithing
Subject: Re: Proximity detectors, flash pots, smoke pots, radio control
Date: 16 Apr 92 15:42:29 GMT
Article-I.D.: doug.1992Apr16.104229.19704
Organization: College of Engineering, Univ. of Wisconsin-Madison

In article <66qaJB1w164w@obmarket> michaelc@obmarket (Michael Campbell) writes:
>
>On a related note, I've heard that modern fire alarms in buildings, (the
>kind you set off, not the automatic kind) have the paint spraying
>mechanisms similar to the ones in bank bags.  (Explode on you, literally
>painting you red.  Sometimes blue.  Impossible to wash off).  True, not
>true?

Heh... sounds like a good idea for places where frequent false alarms are
placed! (schools, dorms, etc.)

I don't know if that's true, but I did here a somewhat similar story from
my high school chemistry teacher: Their school was having problems with
<somebody> pulling false alarms.  So, they simply coated the pull levers
with <some chemical> (a chemmies can probably say what) that turned the
puller's fingers purple for days!

Apparently they caught the scum who was doing it...

						---Joel Kolstad
Newsgroups: sci.electronics
From: nyarko@ee.ualberta.ca (David Nyarko)
Subject: Unknown Chip AN26 (6-pin DIP)
Organization: University Of Alberta, Edmonton Canada
Distribution: na
Date: Thu, 9 Apr 1992 16:06:28 GMT

Could someone help me with specs or identifying
the AN26 (6-pin DIP) in a telephone answering machine?
			David
-- 
-------- David Nyarko   |  Internet: nyarko@bode.ee.ualberta.ca -----
"The evidence of GOD's existence and His gift Jesus Christ is more than
compelling but those who insist that they have no need of GOD or Jesus
Christ will always find ways to discount this offer." 
Newsgroups: sci.electronics
From: adyer@sleepy.UUCP (Andrew Dyer)
Subject: Re: Counters
Organization: Pagine Corporation, San Jose, CA
Date: Mon, 6 Apr 1992 21:48:52 GMT

Perhaps a thing to think about would be a Linear feedback shift register.
These are long chains of F/Fs arranged as a shift register, with a feedback
term generated from taps off of the chain and a small amount of random logic.
They don't count in a binary sequence, but are small, easy to implement, and not 
too difficult to test. Many articles are available about how to design these.

-- 
And when the wombat comes, he will find me gone...

Newsgroups: sci.electronics
From: Montuel@cernvm.cern.ch  (Jean Montuelle)
Subject: Re: IR remote control wired repeater
Reply-To: Montuel@cernvm.cern.ch 
Organization: CERN European Lab for Particle Physics
Date: Tue, 7 Apr 1992 14:33:23 GMT

Newsgroups: sci.electronics
From: furtaw@comm.mot.com (Bob Furtaw)
Subject: Re: goodbye Heathkits
Organization: Motorola
Distribution: na
Date: Fri, 10 Apr 1992 15:45:27 GMT

In article <1992Apr09.163939.16559@microsoft.com>, gordonl@microsoft.com (Gordon Letwin) writes:
> 
The computer industry probably doesn't want to hear this but it was their 
industry, in a roundabout way, that caused the demise of Heath. 
> 
When "Z" bought them in '78? they were interested in the computer side 
of the business ONLY.  They let the kit business go.  The core set of 
people at the company either left or were required to focus on computer,
high volume, built products; the Air Force contract convinced them this 
could be a winner.  Anyway, they effectively either lost the "KIT formular" or
couldn't reach the critical mass to keep the kit business going.

The KIT formular is an instinct on how to produce kits, and there were only a 
handfull of people (at Heath) who "Knew How".  The manual, component mixes,
self testing, were only a part of the formular.  What product to market, and
how to market them was another point.

Complexity of product was NOT the reason.  Errosion of the labor to direct
material base contributed, but this could have beem offset by marketing
distinctively unique products, as was always their Hallmark.

It would take an extraordinary effort to rebuild this business.  And, who would 
want to anyway...it is a limited market...only a few hundred Million. 

Bob Furtaw

These are my own opinions and not necessary that of my employer's.

Newsgroups: sci.electronics
From: pchris@tortel.dcc.uchile.cl (Chris Perleberg)
Subject: Need components...
Originator: pchris@pehuen
Date: Tue, 07 Apr 1992 19:53:31 GMT
Organization: U. de Chile, Depto. Ciencias de la Computacion, CHILE

Hi,
	We are working on a project to convert NTSC/PAL TV signals to RGB
computer monitor signals.  We have tried to obtain the list of parts below
but we can't find a distributor that carries them.  We have tried Jameco and
JDR Microdevices.

	Part Number              Qte         Factory&Description

	TDA 3330                  10          Motorola
	LM 1881N                  10          National
	Toko #A119ANS-T1034       10          12uH Variable Inductor
	Toko #348LS-470K          10          47uH Fixed Inductor
	Toko #348LS-220K          10          22uH Fixed Inductor
	Toko #321LNP-1436P        10          400 ns delay line

Anybody know a distributor that carries these parts?  We need the address,
telephone, and fax number of the distributor.  Thanks for any help,

	Chris Perleberg
	pchris@dcc.uchile.cl
From: bill@hacktic.nl (Bill Squire)
Newsgroups: sci.electronics
Subject: Re: Power Strip Surge Suppressors/EMI filters
Date: 8 Apr 92 00:12:23 GMT

whit@milton.u.washington.edu (John Whitmore @ University of Washington, Seattle) once wrote....
>In article <1992Apr2.191022.3208@ke4zv.uucp> gary@ke4zv.UUCP (Gary Coffman) writes:
>>In article <1992Mar30.202612.12237@u.washington.edu> whit@milton.u.washington.edu (John Whitmore) writes:
>
>	There is NO silicon connected to the telephone wires in an
>approved telephone device.  That surge has to get through a transformer
>to get to the 'sensitive electronics', and any reasonable care taken
>with the transformer can absorb most of the surge right in the
>iron (which is really hard to burn up).  There seems to be a lot
>of anecdotal evidence that modems/faxes and the like are sensitive
>to phone-line surges, which means (IMHO) that there are a lot
>of incompetent designers making telephone-connect equipment.
>It's true, the FCC requirement is only that the surge won't
>cause a hazard to the phone wires or the consumer, and will
>cheerfully allow the modem to immolate itself.

        So there can be silicon to the phoneline?  You first say no
silicon, and then imply it doesn't matter!  Well TouchTone is line powered
and therefore means there is silicon on the nongalvanicly isolated side.
There is often the need for a polarity guard...more silicon.  Those "Taiwan
phones" mostly use a phone on chip and all phones that have an electronic
ringer use silicon on the wet line.  If what you said in the first line
were true, people who thought it necessary to use only "approved" equipment
would have to use the old spin dial phones!  What did you mean to say BTW?
I do agree that there are alot of incompetent phone designers.  In fact
alot of then are just "designers", while designing a phone requires
ENGINEERING, not to mention a couple years of experience!
                                                        Bill
Newsgroups: sci.electronics
From: ulan@ee.ualberta.ca (Dale Ulan)
Subject: Re: Need info on Mot 68HC16 Tool Kit
Organization: University Of Alberta, Edmonton Canada
Date: Sat, 11 Apr 1992 15:01:13 GMT

bobkay@pnet51.orb.mn.org (Bob Kyweriga) writes:

>I placed a order with Future Electronics for the Motorola 68HC16
>Tool Kit.  While I got my order in time to get it at the discount
>price, I didn't get the order in quick enough to avoid a long wait
>while Motorola handles a large backorder.

>So while I wait could someone tell me:

>What kind of power supply will I need for the Tool Kit.

You will need +5 volts at about 1 amp. I'm not sure if Motorola
used +5v rs232 drivers on the HC16 board, but they didn't do it on
the HC11 EV board. It may need +12 and -12 volts.... but
something tells me that they are now using single power supplies.

You can get a 50 watt power supply that is *more* than adequate
from JDR microdevices... PS-433B. It is enclosed in a perforated metal
case, and has the 'standard' power connector (I think...).
It will supply the +5v you need, and if the board needs +12 and -12
volts (or if you need those voltages for one of your projects) it will
supply it. Most of the time the 12 and -12 volt rails are regulated off
of a separate winding on the same switching transformer as the 
5v winding, so only the 5 volt winding needs a load, the rest can
be left floating.
The supply sells for $19.95 US, listed price in the catalog.
(add shipping).

>I assume the associated s/w will run on a pc, but is there any
>provisions for running the sucker off a Mac.

Motorola often has software for the Mac. If it isn't included, it
can be downloaded from the Motorola BBS.
512-891-3730    (I'm pretty sure that's the one).

>Any other stuff I might want to gather up in anticipation of
>its day of arrival?
From: barreraa@lamar.ColoState.EDU (Azael Barrera)
Newsgroups: sci.electronics
Subject: Info on a NEC microchip
Date: 9 Apr 92 20:15:14 GMT
Distribution: na
Organization: Colorado State University, Fort Collins, CO  80523

Hello, there!

I am looking for more information -basically I have none- about a microchip
I just came across to: it's made by NEC (I don't have NEC Data books here),
it's surface mount and has 19 x 13 pins on the sides.

It has the following written on:
	NEC JAPAN
	D1723CF  803
	   vI42LA001

The CF maybe GF instead, it's scratched.
What I need to know is: what is this chip, what does it do, and apps.

Thanks in advance for any help. Please reply to may account below.

A.Barrera
barreraa@lamar.colostate.edu
From: cyberman@toz.buffalo.ny.us (Cyberman)
Newsgroups: sci.electronics
Subject: KX-P1091i Printer Buffer
Date: 15 Apr 92 01:47:13 GMT
X-Maildoor: WaflineMail 1.00r

Hi we have this beast and it's anoying when printing graphics to
have the head stop half way through printing a line.  Well anyway
is thier anyway of expanding the buffer on this old beast?

        STEPHEN CYBERMAN@TOZ.BUFFALO.NY.US
        commiserated at Mon  04-13-1992  23:38:47
---
 * SLMR 2.1a * SHOCKING TRUTH:  50% of all people are below average.
From: zari@ee.fit.edu (Kevin Zari)
Newsgroups: sci.electronics
Subject: spice
Summary: LOOKING FOR 387 Emmulator
Keywords: spice
Date: 14 Apr 92 18:51:29 GMT
Organization: Florida Tech, CP/EE Dept.

Does anyone know of a 387 emmulator (shareware) besides FRANKE.387 ver 2.4 ?
I am trying to run a copy of Microsim's Design Center, but the version of Franke I have , locks up my machine (in win 3.1) - a  386 33-Mhz. 

please send info. to :  zari@ee.fit.edu
	thanks in advance
		Kevin Zari
From: henry@zoo.toronto.edu (Henry Spencer)
Newsgroups: sci.electronics
Subject: Re: MOSFETs and HexFETs
Date: 13 Apr 92 16:36:48 GMT
Organization: U of Toronto Zoology

In article <9728.29E7F594@ofa123.fidonet.org> Jeff.Lindstrom@ofa123.fidonet.org (Jeff Lindstrom) writes:
>TGR>What's the difference between HexFETs and MOSFETs?     
>
>  MOSFETs are low power devices.  HexFETs are designed to control power
>from somewhat less than a watt to a couple hundred watts.

Not really right...  "HexFET" is one manufacturer's trademark for high-power
MOSFETs.  (I think the manufacturer is IR, but I could be wrong.)  "MOSFET"
is the generic term, covering both the low-power devices and the high-power
ones, although high-power ones typically have a qualifier attached (e.g.,
"power MOSFET") or are known by a trademark, since just plain "MOSFET" does
tend to be associated with the low-power types when context isn't clear.
-- 
GCC 2.0 is to C as SVR4 is to Unix.     | Henry Spencer @ U of Toronto Zoology
                             -Dick Dunn |  henry@zoo.toronto.edu  utzoo!henry
From: asm@eecg.toronto.edu (Anees Munshi)
Newsgroups: sci.electronics
Subject: Re: oversampling & bitstream
Date: 15 Apr 92 13:08:05 GMT

>>  What is 'bitstream conversion' for a CD player?
>Anyone?

If I'm not mistaken, bitstream is the marketing term for
Delta-Sigma Modulation (sometimes called Sigma-Delta
Modulation; but that's another story :-). 

As Bill Eason (gt8021a@prism.gatech.EDU) points out, increasing
the sampling rate relative to the bandwidth of interest reduces
the burden on the antialiasing and anti-imaging filters. In
addition, however, for the same SNR (in the bandwidth of
interest) you can use a DAC (or ADC) of lower precision (fewer
bits) as long as you arrange for the increased quantization
noise to lie outside this band. Lower precision DACs and
ADCs are, obviously, easier and cheaper to manufacture and DSM
allows for a tradeoff between speed for precision.

Pushing this to its logical extreme, with sufficiently high
sampling rates (say 128*Nyquist) and noise-shaping one can use
one-bit DACs and ADCs. The output of a one-bit DSM would be a
one-bit stream that you could low-pass filter with a resistor
and capacitor.

There are a number of commercial A/D and D/A parts that make use
of DSM; possibly the most famous of these is Motorola's 16-bit
A/D DSP56ADC16. Most A/D's decimate the bit stream to produce
16-bit wide words at little over the Nyquist rate for
processing via standard DSP uPs.  It is, however, possible (and
often advantageous) to process the DSM signal directly without
the added burden of decimation and interpolation.

   0>------[DSM]-----[PROCESSING]------[RC network]----->
  sensor     A/D                       (simple D/A)      output

--
-------------------------------------------------------------------------
Anees Munshi, University of Toronto, Department of Electrical Engineering
Email:asm@eecg.toronto.edu (NeXT mail accepted)
-------------------------------------------------------------------------
From: jws@cica4.mlb.semi.harris.com (James W. Swonger)
Newsgroups: sci.electronics
Subject: Re: Hex-FET's and infinite im
Date: 14 Apr 92 20:28:03 GMT
Organization: Harris Semiconductor, Melbourne FL


 HexFETs get their name from the use of a hexagonal unit cell, which produces
a honeycomb structure maximizing gate width per surface area. Power FETs are
often quite different from the sort of MOSFETs you find on logic ICs; some
are fabricated with the gates occupying V-groove trenches (to give higher
withstand voltages in smaller space), some are actually vertical rather than
lateral, passing current from frontside to backside instead of across the
surface. There is still a bit of art involved in power device design. 
--
##########################################################################
#Irresponsible rantings of the author alone. Any resemblance to persons  #
#living or dead then yer bummin. May cause drowsiness. Alcohol may inten-#
#sify this effect. Pay no attention to the man behind the curtain. Billy!#
Xref: sparky sci.electronics:8546 sci.engr:1224
From: njl5453@hertz.njit.edu (  Nitin J. Lad  EE)
Newsgroups: sci.electronics,sci.engr
Subject: Need names & addr. of Supercomputer Companies.........
Date: 15 Apr 92 13:53:55 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.
Originator: njl5453@hertz.njit.edu

Hello...

Does anyone has names of Supercomputer Companies in
the United States & Japan?

I know that Cray Reseach Inc. make SC.    But, i think,
there many others too.

Please reply to directly at:

	njl5453@hertz.njit.edu

Thank you in advanced.

-nitin lad



///////////////////////////////////////////////////////////////////////
//// Nitin Lad                     			             //
///  Electrical Engineering       InterNET: njl5453@hertz.njit.edu  ///
//   		 	                    njl5453@tesla.njit.edu ////	
//                                                                /////
//   New Jersey Institute of Technology, Newark, NJ              //////
///////////////////////////////////////////////////////////////////////
Newsgroups: sci.electronics
From: cces@bullet.ecf.toronto.edu (Congress of Can Eng Students)
Subject: Re: Software request
Followup-To: cces@ecf.utoronto.ca (Brian Campanotti)  
Organization: University of Toronto, Engineering Computing Facility
Distribution: na  
Date: Tue, 14 Apr 1992 23:39:08 GMT

In article <1992Apr14.172312.13273@udel.edu> weigand@vanilla.udel.edu (Steve Weigand) writes:
>In article <1992Apr14.162435.12865@uwm.edu> alanchem@csd4.csd.uwm.edu (Alan Scott Olson) writes:
>>I'm looking for some public domain software for a PC that will allow me
>>to draw a circuit schematic and the print it on an HP LaserJet laser printer.
>>
>>Does anyone out there have or know where I can get a copy of such a program?
>>
>>Thanks
>>
>>- Alan
>  1. Get yourself a copy of a public domain program for the IBM PC that
>     allows you to take HPGL (HP plotter) files and output to any printer
>     (especially the HP Laserjet). I know this program exists both for the
[...] 
>  2. Get yourself a CAD program of some sort for the IBM. There are 
[...]>
> Hope this helps, 
>  - Steve Weigand
>
Hey, hey, hey...no need to go through all the trouble...
Just get a program called

EEDRAW23 (I think it is 23) 

I am pretty sure that this is available at oak.oakland.edu by anonymous ftp.
There are libraries set up with all kinds of components.

(I think the program is in the pub/msdos/cad directory)

Hope this helps,
 ___________________________________________________________________________
| Brian Campanotti           | campano@ecf.utoronto.ca  | "I live for my    |
| Electrical Engineering 9T3 | campano@ecf.toronto.edu  |  dreams and a     |
| University of Toronto      | cces@ecf.toronto.edu     |  pocket full of   |
| Toronto, Ontario           | cces@ecf.utoronto.ca     |  gold."           |
| Canada                     |                          |        Zeppelin   |
|____________________________|_ANY_ONE_OF_THESE_WILL_DO_|___________________|
From: swsmith@wrdis01.af.mil (Scott Smith)
Newsgroups: sci.electronics
Subject: SCHEMATICS FOR MUSIC MAN 100RD AMP
Date: 16 Apr 92 11:07:25 GMT
Distribution: us
Organization: 1926CCSG Robins AFB

Greetings Fellow Netlanders,
        Would anyone out there know how I could obtain the scats for
the above guitar amplifier. No, I haven't check with the company yet.
I think that they might have closed down the Music Man side of the
biz.
        Also, does anyone know what the jacks on the front are for? It
looks like it wants to have an input and output on the same jack, but
I'm not really sure.
        Thanks in advance for the help.
Scotty
From: 2frlclover@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Cable TV Descrambler
Date: 12 Apr 92 00:15:28 CDT
Organization: University of Kansas Academic Computing Services

Hi all,

I am thinking of building a CABLE TV descramble Kit but I am not sure whether
it will worth my money. I am also interested in knowing the quality of the
picture. Lastly, is it legal in Kansas.

Thanks in advance.

Mike
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Newsgroups: sci.electronics
Subject: Re: Casio Databank Touch Screen Watches
Date: 16 Apr 92 17:57:37 GMT
Organization: Hewlett-Packard, Fort Collins, CO, USA

>Casio did make great nerd!!!!techie watches.  I think they made a business
>calculator version also.  IMHO though, the best calculator watch they made
>had a touch screen that ordinarily just displayed the time/day/date (large
>screen).  When you wanted to use the calculator, then the screen displayed
>the keypad in LCD.  My brother had one, but it was stolen.  Anyone have an
>extra?

I have one, but it's rotting at home in a drawer.  I despised the thing after
a few months, as the "touch screen" relied on some transparent conductors
on the top surface of what passes for a crystal in these things.  After a
few months of normal wear 'n' tear, I had lost several buttons to scratches
that screwed up these connections.

Now I have one of the "Data Bank" types with the membrane (flat) key pad.
(I wasn't crazy about the original "separate buttons" style either, as it
was too easy to scrape off a button - yes, I guess I am hard on watches!)
I LOVE the current watch, although I am considering replacing it with one
of the newer models which allow more characters per entry.  3 years and
still going strong!


Bob Myers  KC0EW   Hewlett-Packard Co.      |Opinions expressed here are not
                   User Interface Tech. Div.|those of my employer or any other
myers@fc.hp.com    Fort Collins, Colorado   |sentient life-form on this planet.
Xref: sparky sci.electronics:8155 sci.engr:1142 sci.misc:1026
From: jmc@engr.uark.edu (John Carmack)
Subject: RCA Scope for sale -- Cheap!
Organization: University of Arkansas
Date: Mon, 13 Apr 1992 02:30:46 GMT

With the spring cleaning came the removal of various unused items in my
electronics toolbox.  Among these is an RCA WO-33A oscilloscope.  The thing
works but needs filter caps (wavey line on no input).  It's ancient enough
that it only goes to 75 KHz maximum sweep frequency.  Yes, it's a tube type 
scope (mostly 12AT7's on the inside).  Probably needs recalibration, but 
regardless, I just want to get rid of it.  Asking $30 plus shipping.  Email
me at jmc@engr.uark.edu

Xref: sparky sci.electronics:8451 rec.bicycles:9350 rec.motorcycles:13082