HDTenEightyP/NetNews huggingface dataset:
From: sowellrm@memstvx1.memst.edu
Newsgroups: sci.electronics
Subject: Re: Pioneer SX-1600 Probelm. Please Help !!!
Date: 8 Apr 92 10:25:58 GMT
Article-I.D.: memstvx1.1992Apr8.042558.1766
Organization: Memphis State University

In article <mac1.702281925@Ra.MsState.Edu>, mac1@Ra.MsState.Edu (Mubashir Cheema) writes:
> 
> 
> 
> 
>   I bought a Pioneer SX-1600 pretty cheap  basically to play with
>   its electronis. It has a problem : No sound !
>   All the digital display pop up just fine but no sound.
>   I connected speakers to both A and B connectors but no luck.
>   Connected the headphones again no luck.
>   Looks like its not the connectors. Just wondering where to start ...
>   Any clues/help will be greatly appreciated. 
> 
>  Thanx alot !
>  
>  Mubashir
>  P.S: If possible, please email : mac1@ra.msstate.edu
> 
>  
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

It is probably the final output stage of the audio amplifier.  These usually
fail when someone shorts out the speaker wires.  It should be either some
transistors (probably 4) or some IC's (1 - 2).  They will be mounted on some
type of heat sink.
Newsgroups: sci.electronics
From: dfs@doe.carleton.ca (David F. Skoll)
Subject: Re: Tying LSTTL inputs to Vcc?
Organization: Dept. of Electronics, Carleton University
Date: Thu, 16 Apr 1992 20:47:21 GMT

In <1992Apr16.154345.11907@ucsu.Colorado.EDU> rainer@spot.Colorado.EDU
(Rainer Malzbender) writes:

>In article <dfs.703361967@ro> dfs@doe.carleton.ca (David F. Skoll) writes:
>>I'm using some LSTTL parts in a circuit I'm building, and some inputs
>>have to be tied to a constant logic "1".
>>
>>Why in most designs I've seen do people use
>>either the resistor or spare gate method?

>I always thought the reasoning had to do with current limiting in the event
>of a catastrophic failure by the chip containing the pull-up. Without a
>resistor you could short out the power supply, although that doesn't seem
>to be such a big deal any more. Certainly for home hacking I never use
>resistors.

I'd imagine that shorting the power supply through a chip would pretty
quickly burn the bonding wire or power metalization in the chip.

One other reason someone mentioned (that I had forgotten) was that using
a resistor makes it easy to change the value on the pin for test purposes.
That's why some designs have a logic "0" tied to the output of an inverter
whose input is tied to Vdd through a resistor... (whew.)

In summary, as William McFadden and Brian Rhodefer wrote to me, LSTTL inputs
are really DTL inputs, and don't need the resistor for protection.

--
David F. Skoll

Newsgroups: sci.electronics
From: pnz46378@uxa.cso.uiuc.edu (Paul N. Zaremba (AA9BK))
Subject: AM transmitters
Summary: Need info on oscillator, component selection
Keywords: AM transmitter power
Organization: University of Illinois at Urbana
Date: Tue, 7 Apr 1992 01:37:43 GMT


HI!

I am trying to build a part 15 AM radio transmitter suitable for transmission
on the AM broadcast band. This will be used to provide a neighborhood     
broadcasting service (several of my friends live in or very near to my house).
Please give me advice on construction of an antenna that will allow the 
greatest efficiency/power transfer, and also please give some insight into the
maximum usable range I can expect from such a device. Replies here on the net
for others to use or in e-mail will be greatly appreciated.

Thanks in advance (this is very cliche' here on the newsnet.....)


-- 
******************************************************************************* Your haggard, budding young electrical engineering student friend from Illinois Paul N. Zaremba / Amateur Radio Callsign AA9BK (After A 9th Beer, KILLED!)
Owner/Operator - RADIO TERRA AM 920! (Your local Part 15 Broadcaster)
My hate list: ECE270, PHYCS108, MATH285 (RENT THIS SPACE! Call (217) 332-4221)
******************************************************************************* 
Newsgroups: sci.electronics
From: cgordon@vpnet.chi.il.us (gordon hlavenka)
Subject: Cellular control head protocol?
Organization: Vpnet Public Access
Date: Thu, 16 Apr 1992 03:28:21 GMT

First:  My application for this is _definitely_ commercial.   But I'm
not asking for the information, I just want to know where to _get_ the
information.

I would like to use a cellular phone control head (the "handset" part)
with some non-cellular equipment.  In order to accomplish this, I need
to know how to communicate with the control head.  There are (8) wires
involved.

I imagine that two of them are power and ground; two are MIC audio
(balanced); two are speaker audio (balanced) and the last two are
clock/data.  I've heard a rumor that there is/was a standard ("AMPS"?)
which defines the pinouts, character codes, etc. to use.

I need to do the obvious:  display data on the screen (I understand
this will vary somehat from manufacturer to manufacturer), read the
keypad, send and receive audio.

I started by buying a control head from a local cellular dealer.  Now
I find that the manufacturer of that unit is reluctant to tell me how
to do what I need to do.  (I know, "Phone first!")

I need to know: (A) How to obtain a (legit!) copy of the AMPS standard
document, (B) Pinouts / protocol for communicating with a "standard"
control head, or (C) a cellular equipment manufacturer interested in
selling a few thousand control heads and willing to tell me how to use
them.

Pointers to helpful information greatly appreciated!

-- 
-----------------------------------------------------
Gordon S. Hlavenka            cgordon@vpnet.chi.il.us
 Official Supporter of the Barry/Walsh ticket in '92
From: nagle@netcom.com (John Nagle)
Newsgroups: sci.electronics
Subject: Re: HELP needed with Phase Comparator
Date: 8 Apr 92 04:18:02 GMT
Article-I.D.: netcom.-qqj3=j.nagle
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

geoffrey@cosc.canterbury.ac.nz (Geoff Thomas) writes:
>Hi, I'm looking for a circuit that will produce a voltage
>proportional to the phase difference between to input signals
>(both about 300 MHz). 

     Mini-Circuits (718-934-4500) sells phase detectors that may do the
job for you.  My 89-90 catalog shows phase detectors good to 200MHz,
and balanced mixers into the GhZ range.  Both are basically the same
circuit, but the phase detectors produce a more accurate phase signal.
Call Mini-Circuits and ask for advice.

					John Nagle
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: Advice on high-speed ADC
Date: 16 Apr 92 00:56:53 GMT
Organization: University of Washington, Seattle

In article <1992Apr15.155915.1515@news.nd.edu> fdeck@sleepy.helios.nd.edu (francis deck) writes:

>I am gearing up to build a "digital sampling oscilliscope"
>which connects to the parallel printer port of an IBM PC.
>My idea is to clock a high-speed flash ADC into a static
>RAM chip.  After a "frame" worth of data are thus collected,
>they are transferred to the PC at lower rate for subsequent
>display, etc.  

>I am looking at the CA3306D converter which can hum along
>at 15 MHz.  So, this will be my target clock rate, with
>lower rates available by dividing the clock down.

        This is probably one of five or six most-often-dreamed-of
projects.  First observation: with a good sample/hold amplifier,
you can up the bandwidth of the input stage without adding error,
and if the input can handle 150 MHz, ten passes can theoretically
be made at staggered intervals after the trigger event, to
fill in the full information.

        Second observation: making a good attenuator/preamp for
the front end of this puppy will be difficult; it might be easier
to make a crude attenuator and use your reference voltage on
the ADC to change by factor of 1/2/5.  Adding a calibration
generator is a good idea (and doesn't take much work).

        Third observation: a dual-trace scope is not twice as
hard as a single-trace; figure on making it modular, so that
adding a channel is a matter of duplicating one small part
of the hardware.

        Fourth observation: a good trigger circuit can be built
with a PLL, and the trigger will have to set off a carefully
timed set of events.  A variety of PLL phase detectors (mixer
type, XOR type, and counter type), and a switch to select
between them, will prove valuable.  Beware skew and delays
in the trigger output; you need ACCURATE timing of the sample/hold
signal, so this signal will have to be driven well, and
terminated carefully.  Using the PLL in lock, you will be able
to view events BEFORE the trigger as well as after.


        John Whitmore                                         
From: myers@hpfcso.FC.HP.COM (Bob Myers)
Date: Mon, 6 Apr 1992 19:24:51 GMT
Subject: Re: question about RC circuits for timing purposes
Organization: Hewlett-Packard, Fort Collins, CO, USA
Newsgroups: sci.electronics

Sorry, you have the wrong circuit; you should have the capacitor ACROSS the
relay coil, not in series with it.  As it is, all of the 12V winds up across
the cap, with nothing through the coil (i.e., no DC current path).

It might be better to have an RC which was connected to the coil through a
transistor; presumably, you could arrange things so that little base current
was needed (as compared to the current needed to energize the relay coil)
and so the cap could hold the relay on longer than it could be driving the
coil directly; this requires a constant source be available for the
coil/transistor.  Perhaps a battery, if this thing has to be portable.

                       /--------  collector, to relay coil and DC supply
       ---/\/\/\------|  NPN
                   |   \__  emitter
                   |      |
                 -----    |
                 -----    |
                   |      |
                   |      |
                   ground

Use any general-purpose NPN transistor that'll handle the relay coil current;
a Darlington would require less base current, but wouldn't turn until the
voltage on the cap reached about 1.4V (vs. ~0.7 V for the simple NPN).  You
can figure the approx. delay by figuring how long it takes the cap to reach
this voltage (it should be safe to ignore the transistor for this calculation,
assuming reasonable values/parts).


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.
From: klimasewski@fccvde.enet.dec.com (Ken Klimasewski)
Newsgroups: sci.electronics
Subject: PROMPRO 8 program
Date: 7 Apr 92 17:27:18 GMT
Organization: Digital Equipment Corporation


I am looking for some Public domain software that will allow me 
to use my LOGICAL DEVICES Prompro-8, prom programmer with my 
computer.

The computer is a IBM clone 286 

LOGICAL DEVICES sells a program called PROLINK but it is for the 
PROMPRO-8X and does not support the earlier version 8.



                                     thanks,
                                       Ken
                                       508-467-2663


Ken Klimasewski	klimasewski@fccvde.enet.dec.com
		--or-- ...!decwrl!fccvde.enet.dec.com!klimasewski
		--or-- klimasewski%fccvde.dec@decwrl.dec.com
Newsgroups: sci.electronics
From: larrie@beaufort.sfu.ca (Larrie Simon Carr)
Subject: Re: How much protection do I need?
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Mon, 13 Apr 1992 05:54:39 GMT

In article <bc338569.82.703134685@longs.LANCE.ColoState.Edu> bc338569@longs.LANCE.ColoState.Edu (Brian J. Catlin) writes:
>I am planning on building a digital tachometer for my truck.  For the input,
>I would like to count the number of times that the ignition coil is pulsed.  
>Since there are likely to be some rather large power spikes, I would like to 
>know what kind of circuitry I would need to protect my TTL-level circuitry.

The best way would be NOT to connect your circuitry to the ignition coil,
but to inductively couple (wrap a few turns around the main ignition 
coil lead).  Clamp the output using zeners (collection of diodes) and
run it into a inverter?  

I have seen designs where the input was a antenna that picked up
the RFI from the ignition system.  Doing this reduces the designs
restrictions such a solidstate ignition compared to a old-fashions
points system.

-- 
Larrie Carr                 
Engineering Science               (604) 291-4451  
Simon Fraser University           (604) 298-1050
British Columbia, Canada          larrie@sfu.ca
Newsgroups: sci.electronics
From: toddi@mav.com (Todd Inch)
Subject: Re: IR remote control wired repeater
Organization: Maverick International Inc.
Date: Tue, 07 Apr 92 00:06:05 GMT

Well, if you don't mind "totally wired" - I simply put a 1/8" jack in
the bottom of my remote control attached to the IR LED and have it run
a spare IR LED ($1.50, rat shack) mounted near my VCR.  I use flat
modular cables and duplex modular wall jacks.  The IR uses the unused
(Black and Yellow, or Orange/White pair) phone wires already in the
wall.

It might be tricky to find the physical space in your remote to mount a
jack, however.
From: spcecdt@deeptht.santa-cruz.ca.us (John DuBois)
Newsgroups: sci.electronics
Subject: Re: Casio Databank Touch Screen Watches
Date: Sun, 12 Apr 92 19:30:39 GMT
Organization: The Armory

In article <60570009@hpcuhe.cup.hp.com> dclaar@hpcuhe.cup.hp.com (Doug Claar) writes:

...

+What I'd really like to see is one that can be downloaded with
+appointments...and a decent calculator again. Sigh. I miss my
+old watch.
+
+--Doug Claar
+dclaar@cup.hp.com

     I went looking for a watch a couple of years ago.  What I really
wanted was a thin LCD watch.  Interestingly, I found that the Casio
databank watches were the thinnest LCD watches I could find, despite
all the extra functionality.  I ended up getting a DBX-100 because it had
a better keypad (less of a membrane-style keypad) than the others.  The
only feature it lacked that I wanted was a light.  Oh well... the better
keypad was worth it, I think.
     Anyway, I found that I do actually use the databank (to store phone
numbers), but it is annoying enough to have to enter them using the
limited keypad that I don't keep it up to date.  I have all the info
online already, so I too would like some sort of port...

	John
-- 
John DuBois	spcecdt@deeptht.santa-cruz.ca.us	KC6QKZ
From: klimasewski@fccvde.enet.dec.com (Ken Klimasewski)
Newsgroups: sci.electronics
Subject: PROMPRO 8 software
Date: 16 Apr 92 10:26:57 GMT
Organization: Digital Equipment Corporation


I am looking for some software that will allow me 
to use my LOGICAL DEVICES Prompro-8, prom programmer with my 
computer.

The computer is a IBM clone 386 

LOGICAL DEVICES sells a program called PROLINK but it is for the 
PROMPRO-8X and does not support the earlier version 8.



                                     thanks,
                                       Ken
                                       508-467-2663


Ken Klimasewski	klimasewski@fccvde.enet.dec.com
		--or-- ...!decwrl!fccvde.enet.dec.com!klimasewski
		--or-- klimasewski%fccvde.dec@decwrl.dec.com
From: ssave@ole.uucp (Shailendra Save)
Newsgroups: sci.electronics
Subject: Re: question about RC circuits for timing purposes
Date: 7 Apr 92 00:18:46 GMT
Organization: Cascade Design Automation, Bellevue, WA

In article <13-PCNews-124beta@wendy.bowlgreen.oh.us> jmiller@wendy.bowlgreen.oh.us (Jim Miller) writes:
>Hello everyone,
>    I am trying to rig up a 12 volt DC circuit that will introduce a time
>delay.  In general, here's what I want to do:
>
>                 +--------+                 +--------+
>   + 12V --------| delay  |------ + 12 -----|  12VDC |-----  relay contacts
>                 | circuit|                 |  relay |
>                 |        |                 |        |-----
>   - ------------|        |------ neg ------|        |                     
>                 +--------+                 +--------+
>                 
>
>For the delay circuit, I had planned to use a a resistor and capacitor 
>in series with the positive side of the relay, and adjust the size of the
>resistor accordingly.  That is, there would not be enough voltage
>passing through the RC circuit during charging to energize the coil, but
>once the time period had passed, the relay would pick up.
>
>
>  + 12 -------/\/\/\-----||------- relay coil
>              ? ohms    ? uf
>              
>This circuit does not have to be very accurate at all; I just need to
>introduce a second or so delay between the input to the circuit and
>the time the relay picks up. Also, the circuit will not need to be operated
>very often, so it wouldn't need to recover quickly when the +12 is taken
>away.
>
>If this is indeed a proper solution to the problem, how should I
>choose the values of R and C?  Will I have a problem with the capacitor
>holding the relay up long after the +12 is taken away? 
>
>Thanks in advance for any help you can give. I am at college, and
>all of my electronics books with the formulas are 150 miles away at home.
>
>Jim Miller


  You probably want something like:


		     |------------------------|
		     |                        |
		     |                        |
  +12 ------/\/\/\/---------- relay coil -----|
		     |
		     |
		    ---
		    ---
		     |
      ------------------------




                                                         -(t/RC)
	Then you can calculate the delay as   v = V(1- E^      )

	    where: v = voltage the relay is going to trip
		   V = Voltage of the supply (12V in this case)
		   E = Epsilon
		   t = time it takes to get to 'v'
		   R = Value of resistor
		   C = value of capacitor.



  Note one more thing. If you want the the relay to stay "on" or "off"
you might just want to tie the output of the relay back to the input,
so that once it is turned on (or off) you need to turn the power off
to open(close) the relay contacts.  
  The Capacitor will not be able to hold the relay for long. Typical
relays are from 10ohms to 1Kohms. That's a lot of current to be supplied
by a cap.

-S
From: ericc@arco.com (Eric Chang)
Newsgroups: sci.electronics
Subject: Help on magnetometer
Date: 7 Apr 92 13:52:13 GMT
Distribution: usa
Organization: ARCO


I am looking for a simple magnetometer which will look for small perturbations
in the earth's magnetic field.  I wonder if anybody has any circuits for this
or any sources.  Are the best ones for this purpose dual coil, proton preces-
sion, hall effect, or flux gate?  Please email me with answers at ericc@
arco.com.  I will post summary.
From: derek@slab.slip.uiuc.edu (Derek Taubert)
Newsgroups: sci.electronics
Subject: Re: frequency counter
Date: 14 Apr 92 09:46:58 GMT
Reply-To: dat33228@uxa.cso.uiuc.edu
Distribution: sci
Organization: Damage Inc.

In article <1992Apr14.864.15887@dosgate> wayne.kelso@canrem.com (wayne kelso)  
writes:
> I recently picked up one of those LCD counting modules at Radio 
> Shack.{Part # 277-302} is there any way to create a circuit around this 
> module to create a frequency counter?

Doubtful.  If you notice, the counting module has a maximum count rate on the  
order of 7 counts/sec.  It seems they put in a bit of debouncing hardware.  I  
was quite disappointed by this, as my application needed closer to 30  
counts/sec.  But I hacked around that by adding enough circuitry to add another  
digit (LED) to the counter, useful until I could mail order a counter more  
suited for the speed that I needed.

Derek
From: scottmcd@megatek.uucp (Scott McDermaid)
Newsgroups: sci.electronics
Subject: laser rangefinder
Date: 8 Apr 92 19:54:08 GMT
Organization: Megatek Corporation, San Diego, California


	I am looking for information on laser rangefinders - 
sources or theory of operation. My requirements are as follows;

			1. No reflector 
			2. accuracy .01 ft
			3. handheld

	Any help would be appreciated.
Newsgroups: sci.electronics,sci.engr
From: jjp@dancer.uucp (24432-power)
Subject: radar traps
Organization: Bellcore, Livingston, NJ
Date: Thu, 9 Apr 92 18:04:41 GMT
Followup-To: poster
Keywords: guilt innocence cops

I got nailed in a radar trap.  Cop says I was doing 51 in a
30 mi zone.  I don't believe I was going that fast and
would like to fight it. Does anyone have information
on errors associated with radar guns? Fighting tickets?

Data on radar guns?

Am I wasting my time and money going to court?    
.

Xref: sparky sci.electronics:8481 rec.audio:7390
From: mbk@lyapunov.ucsd.edu (Matt Kennel)
Newsgroups: sci.electronics,rec.audio
Subject: Slew Rate & distortion was (Re: requesting CD player advice)
Date: 14 Apr 92 07:07:30 GMT
Article-I.D.: network.se0biINNaaa
Organization: University of California, San Diego
NNTP-Posting-Host: lyapunov.ucsd.edu

kludge@grissom.larc.nasa.gov ( Scott Dorsey) writes:
: 
: How are you measuring distortion?  I gather that you are talking about a
: THD rating, but a system that has a poor slew rate may have excellent THD
: and still sound poor because it doesn't follow transients well.

I don't understand.  How is having a 'poor slew rate' any difference from
high-frequency dropoff in response?  Intuitively, they seem to be
two ways of describing the same thing, though "poor slew rate" provides
a bit more physical intuition.

Or perhaps "poor slew rate" is a code word for "distortion at high
frequencies"?

: 
: Therefore, you basically need to find what particular rating is required
: to account for a particular type of audible distortion.
: 
: This basically comes down to the argument as to whether people can hear
: differences in CD players.  I can definitely hear them.  More than that,
: I can measure them.  The group delay that is produced by the filters on
: some CD players is really shocking.

This is 'dispersion', right?  (I presume you mean frequency dependent)

: By the way, when people say something sounds "muddy" it generally translates
: as excessive IMD.  I am starting to get better at guessing what is wrong with
: systems ased upon very vague and subjective commentary.  Of course, it takes
: an objective measurement to be sure.

Why doesn't some scientist build a circuit with controllable & measureable
amounts of various types of distortion, and then ask people to choose
from a list of favorite 'audiophile-adjectives', and see what most
reliably goes with what.    

Hmm...I bet somebody's already done this and us kibbutzers just aren't
paying attention...


Flash! Just coming in on the wire.....

6. PAILLARD B; MABILLEAU P; MORISSETTE S; SOUMAGNE J.
     PERCEVAL - PERCEPTUAL EVALUATION OF THE QUALITY OF AUDIO SIGNALS.
     JOURNAL OF THE AUDIO ENGINEERING SOCIETY, 1992 JAN-FEB, V40 N1-2:21-31.

45. ZWICKER E; ZWICKER UT.
      AUDIO ENGINEERING AND PSYCHOACOUSTICS - MATCHING SIGNALS TO THE FINAL
    RECEIVER, THE HUMAN AUDITORY SYSTEM.
      JOURNAL OF THE AUDIO ENGINEERING SOCIETY, 1991 MAR, V39 N3:115-126.


And remember that thread about digital amplifiers?
31. GOLDBERG JM; SANDLER MB.
      NOISE SHAPING AND PULSE-WIDTH MODULATION FOR AN ALL-DIGITAL AUDIO POWER
    AMPLIFIER.
      JOURNAL OF THE AUDIO ENGINEERING SOCIETY, 1991 JUN, V39 N6:449-460.

And objectively evaluating amplifier quality?
39. WOODFORD TW.
      NEW TEST FOR AUDIO AMPLIFIERS.
      Pub type:  Letter.
      ELECTRONICS WORLD & WIRELESS WORLD, 1991 MAY, V97 N1663:406-406.


Amazing what computers can do these days....

: --scott

Matt Kennel
mbk@inls1.ucsd.edu
From: djk@Nitro.CtEdge.COM
Newsgroups: sci.electronics
Subject: Shareware CAD for Circuit Design
Date: 17 Apr 92 10:40:48 GMT
Organization: NMS&Systems Engineering

Anyone know of any good PD or Shareware CAD type programs for 
electronic circuit design?

I've seen Circad - not too bad at all.. But is there anything
better floating about?

-djk

--- Daniel J. Karnes / WA6NDT --------------------------------------
--- NMS&Systems Engineering ----------------------------------------
--- Djk@Nitro.CtEdge.COM / ..CtEdge!Nitro!Djk ----------------------
-- 'innovative solutions for modern problems' ----------------------
Organization: Masters student, Information Networking Institute, Carnegie Mellon, Pittsburgh, PA