HDTenEightyP/NetNews huggingface dataset:
From: cwatters@magnus.acs.ohio-state.edu (Coyt D Watters)
Subject: Walkman to CAMCORD Mic In (FAQ question)
Organization: The Ohio State University
Distribution: na
Date: Mon, 28 Dec 1992 14:06:00 GMT

This is a question which belongs in the FAQ, but since I haven't seen a FAQ for
sci.electronics....

I want to connect a walkman style cassette player to the Microphone input on my
camcorder.  What's the proper way of doing this which won't hurt either piece
of equipment?

-Coyt
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: voice-suppression circuits,karaoke
Date: 24 Dec 1992 13:49:21 GMT
Organization: NASA Langley Research Center and Reptile Farm
NNTP-Posting-Host: grissom.larc.nasa.gov

In article <LyB0VB2w164w@q106fm.uucp> pete@q106fm.uucp (pete cervasio) writes:
>cab@col.hp.com (Chris Best) writes:
>
>> 
>> I can't help you find the company, but here's how they work
>> (as it was explained to me): any signal common to both
>> channels is removed, and signals that are different are
>> left in.  So I guess the song has to be stereo.
>> 
>> Since vocals are typically centered in the image, that's
>> what gets cut out.  Don't know what else does, though.
>
>A _LOT_ of the bass disappears, since it's usually recorded center
>channel, too.  You need drastic equalization to get some of it back.
>There is a problem if there is stereo reverb on the vocals, too... it
>doesn't disappear!

Most of the commercial units remove everything common to both channels
above 250 Hz or so.  This eliminates most of the vocal while leaving most
of the bass.  However if you have anything else mixed to the center
position, it will go away as well, of course (like a lead guitar).

Stereo reverb on the vocals will stick around.  Vocals that were recorded
originally in stereo (like they really ought to be, but seldom are) will
stick around.  Anything miked with a minimalist configuration (very little
rock stuff, but some jazz and a lot of classical) won't work at all.
--scott
From: bk233@cleveland.Freenet.Edu (Jack W. Weinmann)
Newsgroups: sci.electronics
Subject: Re: Microwave Oven Diode Help
Date: 23 Dec 1992 09:30:20 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: bk233@cleveland.Freenet.Edu (Jack W. Weinmann)
NNTP-Posting-Host: thor.ins.cwru.edu


In a previous article, liang@hpindda.cup.hp.com (Alf Liang) says:

>I am trying to find a replacement for a diode that is used in a "Tarpan (sp?)"
>Microwave oven.  This diode has the part number HVPR15-4 (manufacturer's
>part number is 198T016P01 8018).  Any pointers to where to order the exact
>replacement or suitable substitutions are greatly appreciated.
>
>Thanks in advance!
>
>Alfred Liang 
>liang@cup.hp.com
>
>
Try contacting        MCM Electronics 
                      650 Congress Park Dr.
                      Centerville, OH 45459-4072
   Parts Order Line:  1-800-543-4330

I have ordered from them before (for semiconductors for tv repair) and have
gotten good service from them.  They also helped me locate a vcr part that
they personally didn't have a cross-reference for (they gave me the
manufacturer's 800 number.)

Hope this helps.

Jack Weinmann bk233@cleveland.freenet.edu
From: scottb@sail.LABS.TEK.COM (Scott Baker)
Newsgroups: sci.electronics
Subject: microphone circuit
Keywords: microphone
Date: 4 Jan 93 02:29:35 GMT
Reply-To: scottb@sail.LABS.TEK.COM
Distribution: na
Organization: Tektronix, Inc., Beaverton,  OR.

Can someone recomend a minimal part count and minimal power
(battery powered) circuit to amplify a microphone
just enough to trigger a frequency counter (25 mV RMS sine wave
sensitivity, with trigger level variable +-350 mV around the
average value of the input).  The microphone is a Radio Shack
model 33-2001 with 500 Ohm impedance.

I'm want to use a frequency counter as a guitar tuner.

Thanks:
Scott Baker                                   scottb@sail.labs.tek.com
-----------------------------------------------------------------------
|   It's never too late for a happy childhood.           -- Dr. Who   |
-----------------------------------------------------------------------



Newsgroups: sci.electronics
From: schuch@phx.mcd.mot.com (John Schuch)
Subject: Re: help needed building water level sensor
Organization: Motorola Computer Group, Tempe, Az.
Date: Tue, 22 Dec 1992 19:02:54 GMT

In article <00965764.D96DDB80@Msu.oscs.montana.edu> uchrgrh@Msu.oscs.montana.edu writes:
>I would like to build a solid state device that would turn off a water
>pump in my aquarium if the water level drops  below a certain level.
>I am willing to look at prefabricated stuff but would prefer to build it
>my self.

You should be building a system to automatically ADD WATER, not shut
down the filter pumps.

poor fishies

John :-)


-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+
Newsgroups: sci.electronics
From: dowd@wisper.com (Kevin Dowd)
Subject: A source for cheap CCDs?
Organization: home.
Date: Tue, 29 Dec 1992 04:12:51 GMT

Can anyone recommend a source for cheap monochrome video CCDs?

Thanking you in advance,

Kevin

-- 
------------------------------------------------------------------------------
        Say whatever you want about me.  Just spell my name right.
------------------------------------------------------------------------------
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: 1 Jan 93 16:53:29 EST

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?  I'll try and find an address etc for that company,
thanks.

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
From: boris@werple.apana.org.au (Boris Rozenblat)
Newsgroups: sci.electronics
Subject: EUROCOM STANDARD D1
Date: 2 Jan 1993 23:18:50 +1100
Organization: werple public-access unix, Melbourne
NNTP-Posting-Host: werple.apana.org.au
Summary: Query for EUROCOM STANDARD D1
Keywords: modem, telecom, base band, standard, data communications

Hello all,
 
Can anyone tell  me where  I  can  find  text of  "EUROCOM STANDARD D1",
that desribes 4 wire, high speed (64, 128 Kbps), base band modem with
conditional diphase modulation.
 
Any help would much be appreciated.
 
Regards,
 
Boris
 
P.S
Please answer by EMAIL



-- 

Boris Rozenblat                        EMAIL:  boris@werple.apana.org.au
Melbourne, Australia                   
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
From: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
Newsgroups: sci.electronics
Subject: Re: microphone circuit
Date: 4 Jan 1993 05:17:32 GMT
Organization: Case Western Reserve University, Cleveland, OH (USA)
Reply-To: bb099@cleveland.Freenet.Edu (Adam Trent Phillips)
NNTP-Posting-Host: slc4.ins.cwru.edu


In a previous article, scottb@sail.LABS.TEK.COM (Scott Baker) says:

>Can someone recomend a minimal part count and minimal power
>(battery powered) circuit to amplify a microphone
>just enough to trigger a frequency counter (25 mV RMS sine wave
>sensitivity, with trigger level variable +-350 mV around the
>average value of the input).  The microphone is a Radio Shack
>model 33-2001 with 500 Ohm impedance.
>
>I'm want to use a frequency counter as a guitar tuner.
>
>Thanks:
>Scott Baker                                   scottb@sail.labs.tek.com
>
>

	I figure an op amp should do the trick just fine. There is also an
audio chip (I'll try to look it up) that will work off of a 9v, make it
EASY for the feq. counter to detect the signal AND double as a headphone
guitar amp.

	I also have two of these headphone guitar amps. I could take a look
at the ckt. and tell you what it is...only a few parts and runs pretty long 
off a 9v.
-- 
A. TRENT PHILLIPS |" A mirror is a negative space with a frame and a place for
  also known as   | your face, it reveals what the rest of us see. It conceals
   WHITE  ROOK    | what you'd like you to be."--Blue Oyster Cult
-------bb099@cleveland.freenet.edu-----aa1439@freenet.lorain.oberlin.edu-------
Newsgroups: sci.electronics
From: laird@stable.ecn.purdue.edu (Kyler Laird)
Subject: Re: can't clear M68HC705KICS interrupts (CLI/RTI)
Organization: Purdue University Engineering Computer Network
Date: 31 Dec 92 20:23:47 GMT

Whoops!  I wasn't writing to IRQR...

I'd still like a pointer to a new manual, though.

--kyler
Newsgroups: sci.electronics
From: matthew@alchemy.tn.cornell.edu (Matthew Kleinmann)
Subject: Re: RFI free dimmer switches...
Organization: Alchemy International
Distribution: na
Date: Sun, 27 Dec 1992 06:33:25 GMT

A rheostat will get mighty warm dimming a light.  Not a smart way to go.
If you want to follow that sort of a path, I would try a varyable voltage
transformer.  At least that will be a bit efficent.  You may also want to 
try converting the output of your lamp dimmer to DC (with 4 diodes) and
adding a filter so the higher frequency noise going to the lamp is smootheed
out.

--Matthew


-- 
                       Alchemy International, Ithaca NY
                        matthew@alchemy.tn.cornell.edu
                         matthew@alchemy.ithaca.ny.us
                              Public Access Unix
From: dplatt@ntg.com (Dave Platt)
Newsgroups: sci.electronics
Subject: Re: help needed building water level sensor
Date: 29 Dec 92 22:24:52 GMT
Distribution: usa
Organization: New Technologies Group, Inc.  Palo Alto CA

>First, for reliability, you definitely need multiple sensors.  Three
>should be sufficient.  These will each be monitored by separate
>microcontrollers and the results sent to a master contoller via a duplexed
>serial link.  Some more work will have to be done to determine the optimal
>protocol for the link and so on.  Most probably have to develop an entirely
>new one.
>
>There is obviously still quite a bit of design to do here, but this is just
>a start.  Any other ideas would be appreciated. ;)

Kids these days got _no_ sense of proportion.

Why, in the old days, we didn't fiddle around with any of this
microcontroller nonsense.  We just glued a couple of 1" copper pipes in
the corners of the aquarium, clamped wires to them, and put them in
series with the motor power wire.  When the water level dropped below
the ends of the pipes, the current was cut off and the pump stopped.
A handful or two of salt in the water make it plenty conductive, and the
free chlorine electrolyzing off of the electrodes got rid of all that
algae.  Simple, crude, brute-force... and we liked it!


Obligatory smiley (;-) for the humor-impaired, and the disclaimer
required for survival in these lawyer-infested waters: THIS IS NOT A
GOOD IDEA, KIDS, DO NOT TRY THIS AT HOME OR ANYWHERE ELSE!

[and a free congratulatory email message to the first person to identify
 the skit from which my first sentence above was lifted.]

-- 
Dave Platt                                                VOICE: (415) 813-8917
              Domain: dplatt@ntg.com      UUCP: ...netcomsv!ntg!dplatt
 USNAIL: New Technologies Group Inc. 2470 Embarcardero Way, Palo Alto CA 94303
Xref: sparky sci.electronics:21498 sci.energy:6422 rec.autos.tech:17125
From: elson@otc.otca.oz.au (Elson Markwick)
Newsgroups: sci.electronics,sci.energy,rec.autos.tech
Subject: Re: Flywheel batteries as EV power source
Date: 23 Dec 92 22:18:45 GMT
Organization: R&D, OTC Sydney, Australia

In article <1h2uu9INNfm0@gap.caltech.edu>, carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:
> In article <1992Dec18.032310.12293@ast.saic.com>, gregor@kafka.saic.com (gregg hanna) writes:
> =At least some energy would be absorbed heating up the Halon as it
> =expands from the tank, and then the mixture would hit air.
> 
> A trivial fraction of the energy involved.  A big problem in this discussion is
> that many people simply don't seem to have the vaguest idea as to just how much
> energy is involved.
> 
> Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL

I missed the first part of this debate, and I didn't get to see any figures being
thrown around, so roughly how much energy *would* be invloved?  For a rough
calculation, say you want your vehicle to be able to travel for 3 hours, and
consumes a road horsepower of 30hp (sounds fairly excessive to me, even for a
petrol engined car - an electric will use a lot less road horsepower than an IC
powered car), I get about 250 MegaJoules.  Obviously, the more you can reduce the
road horsepower, (less loss in the drivetrain, however the drivetrain is
organised, more aerodynamic, etc etc) the lower your stored energy would need to
be.  Also, if the vehicle were to be used as a commuter car, (say half hour trips
between work and home, where you had an outlet at work to recharge the system),
the required energy would be much less, due to both shorter duration trips, and
a lower required speed, which implies less road horsepower, then the required
energy would be even less.

Having said that a flywheel of usable size and weight for cars would still have to
spinning at some incredible speed, which in turn would mean there'd be one hell
of a strain on the flywheel (not to mention balancing problems).

Given that, I'd have to agree with the guy who said that flywheel batteries are
better suited to stationary environments, where they aren't constrained so much
by size (ie - a much bigger, slower spinning flywheel).  Alternatively, they
could be used in cars along with another source of energy, to help supply peak
energy requirements, such as starting from traffic lights.  If you could use the
flywheel as a store for regenerative braking, then you could use a much smaller
IC engine as the main power source.  Also, they'd be useful for city traffic,
where a good percentage of the time is spent stationary (at traffic lights).  The
IC engines in cars today still tick over when the car is stationary, just wasting
energy.  Why not tap that and use it for recharging the flywheel?

Cheers, Elson
-- 
Elson Markwick |ACSnet:  elson@otc.otca.oz.au
OTC R & D Unit |UUCP: {uunet,mcvax}!otc.otca.oz.au!elson
Ph: 02 287 3142|Internet: elson%otc.otca.oz.au@uunet.uu.net
Fax:02 287 3299|Snail:  GPO Box 7000, Sydney 2001, Australia
From: clemon@lemsys.UUCP (Craig Lemon VE3XCL)
Newsgroups: sci.electronics
Subject: Re: Caller ID block?
Date: Sun, 27 Dec 1992 11:46:57 EST
 <1992Dec23.161608.11920@cc.gatech.edu> <1992Dec24.071910.2760@lunatix.uucp>
Distribution: world
Organization: Private UUCP "Twig" Node
X-Newsreader: Arn V1.00

In article <1992Dec24.071910.2760@lunatix.uucp>, Chad Helfenberger writes:

> >BTW something else to add to the fire. Yesterday (12/21) I got a strange call
> >from a woman claiming that prank calls were coming from my house. I don't
> >know if she got the number from CNID or *69 ringback service. I'm certain
> >that it wasn't true (I was on the phone at the time she said the calls were
> >made) but just intersting about how information can be used against you.
> 
> That's very strange.  Could you determine by talking to her what happened?  
> Could you convince her that you were, indeed, not the harassing caller?  
> Anyone else have any other things to add on this?

        I personally would watch this closely.  I realize that while
computers, in theory, don't make mistakes, operators and programmers do. 
The possibility exists that this woman can't read her CID box, or can't
listen to the *69 recording properly, but it is also possible that someone,
somewhere has figured out a way to display someone else's number when
making a call (perhaps an on-the-rampage telco employee?).  Has this
happened again?  Since you were on the phone at the time of the supposed
calls, you can probably rule out the possibility of restless teenagers (not
that _all_ teenagers are like this) crouching at your groundblock with a
phone modified to use alligator clips...

--
 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: digennar@fcs280s.ncifcrf.gov (Frank S. DiGennaro)
Newsgroups: sci.electronics
Subject: Pulse Shaping...
Date: 21 Dec 92 17:41:48 GMT
Organization: Frederick Cancer Research and Development Center


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?

Thanks.

Frank DiGennaro
The National Cancer Institute
Frederick, Md.
digennar@fcs280s.ncifcrf.gov
From: tomb@hplsla.hp.com (Tom Bruhns)
Date: Tue, 22 Dec 1992 21:54:05 GMT
Subject: Re: AM filters
Organization: HP Lake Stevens, WA
Newsgroups: sci.electronics

svaldez@sdcc13.ucsd.edu (@ocf.berkeley.edu  ) writes:

>  I'm experimenting with a transmitter for the AM (.5-1.7 MHz)
>commerical broadcast band and would like to design filters to
>prevent high emissions on the fundamental and harmonic frequencies.

>  Can someone recommend filter designs which can handle several
>watts of power? This can't be too hard yet I'm not an EE major so
>I need formulas/design instructions, etc...  Thanks.

Probably the easiest and best is to simply operate the transmitter
into a resistive (dummy) load.  Then you won't have to worry about
emissions on the fundamental or harmonics.  Ham publications like
the Radio Amateur's Handbook can help with harmonic filters; just
scale the frequency and impedance.  To scale impedance:  divide all
capacitors by the impedance ratio, and multiply all inductors and
resistors.  To scale frequency:  divide all inductors and
capacitors by the frequency ratio.

But "transmitter" implies radiating a signal.  So along with the above
comments comes this unsolicited advice:  unless you have a station
license, don't even think about radiating several watts (or more??)
in any band, and especially not in a broadcast band where you are
liable to attract lots of unwanted attention.
Newsgroups: sci.electronics
From: gcouger@olesun.okstate.edu (Gordon Couger)
Subject: Re: Soundblaster for low rent data acquisition?
Organization: Oklahoma State University, Stillwater
Date: Thu, 24 Dec 1992 00:31:47 GMT

In article <PHR.92Dec22195830@napa.telebit.com> phr@telebit.com (Paul Rubin) writes:
>I am interested in a cheap way to monitor some slowly changing
>voltages (read: DC) in a piece of test equipment.  8-bit resolution
>is fine.  I can scale the voltages to the 0-1 VDC range (or similar)
>using resistor networks if I need to.
>
>Does anyone know if a Soundblaster is a reasonable way to do this?
>Can I get continous DC DAC output from the soundblaster?


Sound Blaster works great you to 44 kHz single channel and 22 Khz 
dual channel. Their software is easy to use and the file format is
easy to figure out. I have some source code at work if any one is
interested.
Gordon
Gordon Couger
AB5Dg   Agriculture Engineering Oklahoma State University
gcouger@olesun.agen.okstate.edu 405-744-6514 day 744-2794 evenings
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: help needed building water level sensor
Date: 30 Dec 92 04:31:46 GMT
Distribution: usa
Organization: Kernel Mode Consulting, San Diego, CA

In article <1992Dec29.175243.10083@cbnews.cb.att.com>, wrb@cbnews.cb.att.com 
(wallace.r.blackburn) writes:
> In article <1hq0ilINNbji@fnnews.fnal.gov> behnke@FNALF.FNAL.GOV writes:
>>In article <00965764.D96DDB80@Msu.oscs.montana.edu>, uchrgrh@Msu.oscs.montana.edu writes:
>>>I would like to build a solid state device that would turn off a water
>>>pump in my aquarium if the water level drops  below a certain level.
>>>I am willing to look at prefabricated stuff but would prefer to build it
>>>my self.
>>
>>Seems that a simple micro-switch attached to a float would work fine.  [...]
> 
> HEY!!!!  That would be simple, functional, and reliable!  What the heck are
> you trying to do here?!
> 
> I was going to answer this in a few weeks.  I wanted to get the results of
> the modeling and reliability studies first.  Since I'm on the spot though,
> I'll give the preliminaries.
> 
> First, for reliability, you definitely need multiple sensors.  Three
> should be sufficient.  These will each be monitored by separate
> microcontrollers and the results sent to a master contoller via a duplexed
> serial link.  Some more work will have to be done to determine the optimal
> protocol for the link and so on.  Most probably have to develop an entirely
> new one.

I thought this was sci.electronics.  This last bit sounds like comp.mail.uucp .
:-)

However, the best microcontroller-based design cannot make up for poor sensors.
And as long as we're going to all this trouble, we should ensure that the
design is robust enough to stand up to marine environments (e.g. for salt-water
aquariums, aquatic parks, etc.).  I doubt that the float-and-microswitch
arrangement qualifies on this point.  

Obviously, the best solution is to use Polaroid ultrasonic ranging modules to
determine the height of the liquid in the tank.  These will have no problems
with corroding pivot-points nor with corroding sensor probes, etc., and in fact
will be completely noninvasive (unless the tank occupants are sensitive to
ultrasonics; hmm, better check out the freq. range of dolphin hearing, among
others). 

Best of all, since you now will have not just a simple on-off sensor but rather
a continuous range of values, your microcontrollers can keep a record of the
water height over time.  You can use this to figure out the optimal times to
add water to the tank.  Who knows, the movements of various fish may produce
recognizable "signatures" in the ripple patterns on the top of the water, and
you could collect this information and analyze fish activity levels over time.

Probably two or three research grants' worth of work right there.  

:-)

	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh