HDTenEightyP/NetNews huggingface dataset:
From: htoppman@faui30g.informatik.uni-erlangen.de (Herbert Oppmann)
Subject: ZX80 Adapter Pinout (for peterlew@bnr.ca)
Organization: CSD., University of Erlangen, Germany
Date: Wed, 14 Oct 1992 21:34:25 GMT

[I tried to email to you but it bounced]

The Sinclair ZX81 had exactly the same connector, if I remember correctly.
All important signals can be found on that connector, e.g. data bus,
address bus, control lines, ...
So it was not made for a specific purpose but to allow to connect
anything you like. There were memory expansions, a sound generator card,
a centronics interface and probably a lot more.
The circuitry of the ZX81, including the pinout of the connector, was
printed in the manual that came along.
I once had a ZX81, but gave away all of the stuff some years ago,
so I have no possibility to provide you with the pinout.
Looking for the ZX81 pinout is probably more efficient, because the
ZX81 became much more popular than the ZX80.
--
| Herbert Oppmann | email: htoppman@cip.informatik.uni-erlangen.de |
| irc: mtx        |  mail: Drausnickstrasse 29, D-8520 Erlangen    |
From: tony@scotty.dccs.upenn.edu (Anthony Olejnik)
Newsgroups: sci.electronics
Subject: Radio Shack Reverb Unit (need help in fixing it)
Date: 13 Oct 92 14:43:48 GMT
Distribution: usa
Organization: University of Pennsylvania

I just got a used, non-working (correctly) Radio Shack Reverb
Unit which I would like to try to fix.

It appears that the unit works correctly (for only a split second,
however).  Then, something `heats' up and then it works as though
it was just a striaght thru box.

It runs by battery or an external AC adapter (I`m using the AC adapter).
Its has what appears to be 3 OP AMPs (or at least 3 8-pin chips).  THe
`OP AMPS' have markings that are unknown to me, thus I'm only assuming
that they`re OP AMPS.  The rest of the circutry is passive (resistor and
caps).  Oh, there a tranny or two as well.

Q:  Has anyone ever had this problem before?
    If so, what did you do to fix it?
    Can anyone offer any suggestions on how I may fix it?
    Does anyone have a schematic for it?

Any help would be *GREATLY* appreciated.

Thanks in advance.

--tony
From: phaf@giraffe.ru.ac.za (MR A FERREIRA)
Newsgroups: sci.electronics
Subject: Re: I need a good drawing program to make pc boards
Date: 16 Oct 92 07:46:51 GMT
Article-I.D.: giraffe.phaf.56.719221611
Organization: Rhodes University, Grahamstown, South Africa

In article <Bvx644.Bws@acsu.buffalo.edu> v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) writes:
>From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER)
>Subject: I need a good drawing program to make pc boards
>Date: 10 Oct 92 19:00:00 GMT
>
> I am sick of pc cad programs. Some like padsdemo are too complicated
>for my uses and programs like pc-trace are too simple and are
>terrible. 

We use Tango PCB for making our boards. It has all the advanced features but 
it is also simple enough to easily do boards without even reading the 
manual. The visual representation of the boards and components is one if the 
best I have seen.

Hope that helps
Andre
-- 
                           Andre Ferreira
                  Internet: PHAF@giraffe.ru.ac.za
     Department of Physics and Electronics_____Rhodes University   
                    Grahamstown____South Africa  
              " Physicists do it with freq until it Hz "
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Meter repair; was: Re: Help! My CD player sk-sk-sk-sk-skips
Date: 7 Oct 92 15:27:12 GMT
Article-I.D.: athena.1992Oct7.152712.26339
Organization: AI Programs, University of Georgia, Athens

In article <BFGRBZMK@dri.com> liberato@dri.com (Jimmy Liberato) writes:
>dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes) writes:

>>I also got a CD with a scratch that make my CD sk-sk....ski...skip.
>>Someone have told me that there might be some cure for the CD...
>
>Go to to a auto paint supply store and get the finest wet/dry sandpaper
>they have (the kind for rubbing out lacquer, something like 1200).
>Carefully sand radially (across tracks). Finish with Glass Wax.  Of course
>it is probably not worth $15 of your time to do all of that!

Innnnteresting!  Sounds like a way to get rid of scratchy surfaces on
old surplus meter faces.  I'll have to try it (on meters, not on CDs...)



-- 
:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:- Artificial Intelligence Programs       phone 706 542-0359
:- The University of Georgia                fax 706 542-0349
:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI
From: pandey+@cs.cmu.edu (Manish Pandey)
Newsgroups: sci.electronics
Subject: Help: Pin assignment for DC-DC Converter
Date: 16 Oct 92 19:18:40 GMT
Organization: School of Computer Science, Carnegie Mellon


Does anyone have the pin assignments for CB-3810 ?

   CB-3810    [ DC-DC Converter , input = 3-7Volts, output= -5V @ 60ma]
	      [ LxWxH = 1.2x0.52x0.48" ]		
 		Manufacturer is TDK  

 
  From the bottom it looks something like this:

      _________________________________
     |        o PIN1           PIN3 o |
     |                                |
     |                                |
     |   	                      |
     | o PIN2                  PIN4 o |
     |________________________________|


  The pins stand for + V input, -V input,  -5 V out, GND, but 
in this case I do not know in which order. Is there an industry standard 
for this ?

Thanks,

Manish Pandey
From: mcovingt@aisun3.ai.uga.edu (Michael Covington)
Newsgroups: sci.electronics
Subject: Re: Sam's Photofacts
Date: 8 Oct 92 20:35:30 GMT
Organization: AI Programs, University of Georgia, Athens

In article <BvtAFx.HLo@ais.org> danr@ais.org (Daniel Romanchik) writes:
>Does anyone still publish Sam's Photofacts?
>
>If so, who?  How can I contact them?
>
>Thanks, Dan

1-800-USA-SAMS, or order through Radio Shack.

-- 
:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
:- Artificial Intelligence Programs       phone 706 542-0359
:- The University of Georgia                fax 706 542-0349
:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI
From: mikem@misg.csd.harris.com (M. K. McCole)
Newsgroups: sci.electronics
Subject: Re: Continuous Power, screen life
Date: 8 Oct 92 21:43:02 GMT
Article-I.D.: travis.1b2a16INNelc
Organization: Harris Computer Systems Division, Ft. Lauderdale FL
NNTP-Posting-Host: misg.csd.harris.com

-Well, actually, it depends on what you mean by "life."
-
-A true, hard failure in a CRT (i.e., it simply doesn't work anymore) IS
-fairly rare.  But CRT lifetimes are generally quoted in time to half-bright.
-You may not consider half the original brightness to be a "failure", as it
-happens so gradually that most folks won't notice it UNTIL they put a new
-unit next to the old one.  But the typical tube reaches this point in
-something like 10k-20k hourse, whereas there's no reason that the rest of
-the monitor (if designed properly) shouldn't have at least a 40k-50k MTBF.
-
-
-Bob Myers               |   User Interface Technology Div.
-myers@fc.hp.com         |   Hardware R&D - Display Dept.        
-                        |   Ft. Collins, Colorado


What is the mechanism that degrades crt brightness?  Is is phosphor
related?  Electron gun related?  If I leave my monitor on with the
brightness turned all the way down, will that prolong the brightness
half life of the tube? 

                               Mike

Mike McCole   305-973-5466     mikem@travis.csd.harris.com   
2101 W. Cypress Creek 33309  Fort Lauderdale, Florida USA
From: bgupta@micro.caltech.edu (Bhusan Gupta)
Newsgroups: sci.electronics
Subject: Looking for 0.025" sq. pin jumper wires
Date: 15 Oct 92 20:28:55 GMT
Organization: California Institute of Technology, Pasadena
NNTP-Posting-Host: alcyone.micro.caltech.edu

Hi all,

I am looking for a wire jumper on whose ends are connectors for a 0.025in
square pin header. I know that ITT Pomona sells them (part #4741), but their
delivery is 4-6 weeks @ $3 per jumper. Does anybody know who else makes them
and how much, etc.? The length I am interested in is less than 12 inches.
Textronix also sells these beasts as part of their SOIC kits (to connect chip
clips to other probes), but they do not unbundle these electrical leads.

I am hoping someone on the net has come across the need for these
jumpers/connectors/leads before and can share their experience.

Bhusan Gupta
bgupta@micro.caltech.edu
--
Bhusan Gupta                          |
MS 116-81, Caltech                    |
Pasadena Ca 91125                     | If I'm not me, who am I?
bgupta@caltech.edu                    |                         (total recall)
Xref: sparky sci.electronics:16997 rec.motorcycles:35713 rec.radio.cb:1186 rec.radio.swap:2751
From: paul@n3eop.pgh.pa.us (paul)
Newsgroups: sci.electronics,rec.motorcycles,rec.radio.cb,rec.radio.swap
Subject: Re: The Communicator
Date: 10 Oct 92 23:31:07 GMT
Organization: CrossRoads in Elizabeth, PA

erc@unislc.uucp (Ed Carp) writes:

> I haven't heard many complaints about the RS 2-meter rig.  Perhaps that's
> because it's made by Icom, hmmm? :) :) :)

Well, it's not...  It's made by Maxon, sold only by RS.
Newsgroups: sci.electronics
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Voice-operated Universal Remote Control
Date: Fri, 16 Oct 1992 19:18:49 GMT
Organization: U of Toronto Zoology

In article <Bw5uuH.3uH@cck.coventry.ac.uk> lsg001@cck.coventry.ac.uk (Graham Wilson) writes:
>>>I just heard an advertisement on the radio for a voice-operated universal
>>>remote control...
>>Careful... unless somebody's made a breakthrough, such devices typically
>>have either a high reject rate ("huh? sorry, I didn't catch that") or a
>>high error rate ("you say you want me to turn the toaster on at 3AM?")...
>
>   ... The system seems to work quite well and is quite effective.

A usually-reliable spy tells me that having had a chance to experiment
with one, he'd never buy it -- under fairly good conditions, the error
rate was so high that it was unusable.  Maybe he's just a worst case for
some reason, but it sounds to me like the sort of gadget that you shouldn't
buy on the strength of canned sales demos.  Try one out first.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
Newsgroups: sci.electronics
From: iqbal@pawnee.eel.ufl.edu (M.Iqbal)
Subject: C Cross Complier for 68HC11 
Organization: University of Florida
Date: Sun, 11 Oct 92 19:28:54 GMT


 The subject says all. If you any sources then please email the
pointer to me.

thanks.
-- 

------------------------------------------------------------------
                                            
      						 >><<<     >>><<<<
Iqbal@sioux.eel.ufl.edu		 		 (o o)     (o) (o)
University of Florida				 [ | ]        | 
                                  		   -         ---
From: sudesh@utkal.njit.edu (T. J. Sudesh)
Newsgroups: sci.electronics
Subject: panasonic(PV-4210) 4 hd for sale!!
Date: 12 Oct 92 13:53:28 GMT
Organization: New Jersey Institute of Technology, Newark, N.J.


      Hi,
   Panasonic 4 Head vcr for sale !!!
The model # PV-4210 (SAME AS PV4210 + COUNTER & PROGRAM DIRECTOR)
THE VCR IS LESS THAN 2 MONTHS OLD...
				THE FEATURES ARE:
1) AUTOMATIC DIGITAL TRACKING
2) PROGRAM DIRECTOR (MAKES PROGRAMMING EASY)
3) SVHS QUASI PLAY BACK (VHS RESOLUTION)
4) BI LINGUAL (ENG/SPAN)
5) 181-CH COMPATIBLE
6) MULTI-EVENT PROGRAMMING
7) THREE SPEED REC/PLAY
8) GOT ALL THE FEATURES THAT NORMAL VCRS HAVE

		QOUTING A PRICE OF $170...
CALL ME AT (201)596-8294 (9AM - 6PM)
	   (201)955-0143 (7PM - 11PM)
Newsgroups: sci.electronics
From: Josef Moellers <mollers.pad@sni.de>
Subject: Re: How do those motion detectors work?
Date: Wed, 14 Oct 1992 09:31:35 GMT
Organization: Siemens Nixdorf Info.Sys. AG, Paderborn, Germany

In <1b30clINN7u1@usenet.INS.CWRU.Edu> an938@cleveland.Freenet.Edu (George II Lenzer) writes:


>	I would like to know how those motion sensing yard lights
>work.  Are they based on IR sensing?  Does anyone have a schematic?
>I would like to build one for use indoors.

I once built one. It uses some kind of ceramic that changes resistance
(or generated a current) when the temperature changes. A special lens
is used to focus "warmth-beams" onto this part.

The information (resistance/current) is fed into an analog
differentiator and a schmitt trigger.

So, when someone, whose temperature was different from the environment,
enters the view-field of the device, the resistance changes (a current
was generated), this generates a signal on the output of the
differentiator, which, if strong enough, triggers the trigger.
The schmitt-trigger is needed to avoid a "hit" due to a rise in ambient
temperature (You only want to have light if a person enters the
view-field, i.e. when a sharp increase of tempereture is detected).

When using indoors, You have to be carefull. I once had it set up, so
that when the sun rose on a sunny day, the first beam of sunlight that
hit the ground in front of the sensor (it was in the basement of my
house) triggered the alarm B-{)
-- 
| Josef Moellers		| c/o Siemens Nixdorf Informationssysteme AG  |
|  USA: mollers.pad@sni-usa.com	| Abt. STO-XS 113	   | Riemekestrasse   |
| !USA: mollers.pad@sni.de	| Phone: (+49) 5251 835124 | D-4790 Paderborn |
Xref: sparky sci.electronics:16928 comp.dcom.modems:14900
From: bender@oobleck (Duke of Canterbury)
Newsgroups: sci.electronics,comp.dcom.modems
Subject: *FOR SALE* Powerline Modems
Keywords: for sale power line modems
Date: 11 Oct 92 05:03:56 GMT
Reply-To: bender@oobleck.eng.sun.com
Distribution: na
Organization: SPARK's R US
NNTP-Posting-Host: oobleck
X-Newsreader: Tin 1.1 PL3

I've got two CompuMech power line (carrier current) modems for sale.  These
modems transmit and receive data over the power wiring in your building at
9600 baud (or less, user-selectable).  Each has a bidirectional RS-232 serial
port that operates up to 19.2K baud.  The modems do error checking and
automatic retransmission without user intervention.

I've got the two modems, power line interfaces and power supplies, and full
documentation.  I'm asking $150 o.b.o.

mike bender
bender@oobleck.eng.sun.com
415-863-8913 (PST, but I'm up late :-)

--
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    Grashopper, you have been many years in the training, and I grow old,
    expecting the day when I receive the SIGXCPU, and _exit this world.
    I see that you are ready.
Newsgroups: sci.electronics
From: whit@milton.u.washington.edu (John Whitmore)
Subject: Re: Soldering using flux!
Summary: simple chemistry
Organization: University of Washington, Seattle
Date: Wed, 14 Oct 1992 01:01:19 GMT

In article <1992Oct13.194943.27623@mnemosyne.cs.du.edu> rbanksjr@nyx.cs.du.edu (Richard E. Banks Jr.) writes:

>I was more than half way finished with a project that I was building
>before I realized how much better solder works when you use flux.

>Anyway, what is flux made of and why does it work so well?

	Metal surfaces are almost always dirty/oily/covered with oxide.
Flux is a mixture of soaplike surfactants and reducing agents (which
reverse oxidation), occasionally with some etchant (to clean metal
throughly, it's convenient to just dissolve the top layer).

	Of course, the flux operates at high temperature; at room
temperature, it's pretty innocuous stuff.  Rosin (pitch from trees)
and zinc chloride and borax are typical flux components.  For
stainless steel, add sulphuric acid to the list...

	All the fluxes I'm familiar with are proprietary mixes.

	John Whitmore
From: jeh@cmkrnl.com
Newsgroups: sci.electronics
Subject: Re: variable speed/pitch cd decks modification?
Date: 16 Oct 92 02:20:41 PDT
Organization: Kernel Mode Consulting, San Diego, CA

In article <1992Oct15.050534.7080@edsi.plexus.COM>, gmeiers@edsi.plexus.COM (Garrett Meiers) writes:
> drp40@cd.amdahl.com (Doug Puchalski) writes:
> 
>>. I am looking for a way to modify a cd player to be able to vary the
>>. pitch approx +/- 10%.   I am hoping for there to be a potentiometer in
>>. the unit that is used for factory adjustment to specs...
> 
>>I asked this question on the net a year or two ago and someone said
>>that Denon had a player out there with a pitch control on it.  I never
>>saw one though.  Perhaps it was a "studio" type player?  I say that because
>>I doubt they would market such a player for normal home usage--there just
>>wouldn't be a demand for it.
> 
> I have seen many decks that have pitch/speed controls..  But I do not
> want to pay the price for one!  

The Denon units mentioned in this thread are not terribly expensive.  I think
the lowest-priced one that had a speed control was selling for around $300 at
a local stereo discount chain store.  

> The demand isn't in the home, but out on
> the road with mobil club Dj's that need to do beat-matching, etc..

The promo literature aimed these units at dance students and teachers, 
people who were learning to play instruments, etc. 

However I might add that the speed/pitch control on these low-priced Denons is
not really suitable for DJ work.  The control is a pair of pushbuttons, one for
"increase" and one for "decrease".  Each push varies the speed by 1%, to a +/-
10% maximum (or you can hold a button down and the deck steps through the
available speeds until you let up).  I don't know if there's an easy way to go
back to 0, either.  

The Technics SL-P1200, which is unquestionably aimed at the DJ market, has a
BIG slider control for pitch (not unlike the ones on their DJ turntables) and,
also, a jog/shuttle wheel (again, allowing cueing much as you would on a
turntable -- I guess; I've never done this sort of DJ work).  J&R Music World
sells this beast for $1100.  Not that expensive considering that it's 
deductible, if you're in that line of work.  

	--- 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
From: gmeiers@edsi.plexus.COM (Garrett Meiers)
Newsgroups: sci.electronics
Subject: variable speed/pitch cd decks modification?
Date: 9 Oct 92 20:14:31 GMT
Organization: Enterprise Data Systems Incorporated, Appleton WI

I am wondering if anyone has done this or know if it is possible without
major modifications..

I am looking for a way to modify a cd player to be able to vary the
pitch approx +/- 10%.   I am hoping for there to be a potentiometer in
the unit that is used for factory adjustment to specs..  The reason I
want to do this is that I am a dj and don't want to spend $2000+ to buy
a double cd-deck unit that the only difference is the variance in pitch
control...I can build an external cueing and start/stop remote unit for
the pair..

I have not purchase a pair of decks yet, I was just wondering if anyone
knows if there is such an adjustment...  Adjusting a pot would be best,
but if I have to do it at a more advanced level, I would still be
interested in any info on how I would be able to vari the pitch..

Thanks alot.  Please email and I will do a summary if there is any
interest for such...

Garrett
------
gmeiers@edsi.plexus.com	                          Garrett Meiers
From: george@mech.seas.upenn.edu
Newsgroups: sci.electronics
Subject: Re: Car antenna design help wanted
Date: 12 Oct 92 19:43:06 GMT
Organization: University of Pennsylvania, Mechanical Engineering

:I presume you mean an FM antenna.  The usual FM car antenna is a 1/4-wave
:whip about 30 inches long, using the body of the car as a ground plane.

hmm... would there be any point to making the antenna 'exactly' 1/4-wave
of your favorite station? ( seems to be ~5" range over the FM band )

--
  /   george jefferson
\/ *  george@mech.seas.upenn.edu
From: keithhar@eb5ts2.EBay.Sun.COM (Keith Hargrove)
Newsgroups: sci.electronics
Subject: Re: F-F-F-FAST ROMS
Date: 15 Oct 92 20:01:51 GMT
Organization: Sun Microsystems, Mt. View, Ca.
NNTP-Posting-Host: eb5ts2.ebay.sun.com

we use a CY7C245 2kx8  15ns part
made by Cypress. it is a prom
in a 24pin dip.
Newsgroups: sci.electronics
From: X1FT@VM1.CC.UAKRON.EDU
Subject: Re: Thunderstorms   (was: Re: Night and Winter)
Organization: The University of Akron
Date: Thu, 8 Oct 1992 01:04:15 GMT

Don't forget the back door!!!!
 
I lost a modem and terminal (and stereo, air conditioner, tv) due to
a lightening hit that came up the PHONE cable to the modem.  The modem
and terminal were on a surge suppressed power strip that I had unplugged
as the storm approached.  Unfortunately so was the tv (rabbit ears, no
external antenna).
 
Apparently the zap went thru my modem and terminal, out the power cords
thru the power strip and back into the tv.
 
An expen$ive le$$on!!
*************************************************************************
Frank Tompkins              Internet: X1FT@VM1.CC.UAKRON.EDU
University of Akron      
Akron, Ohio   44325-3501 
  "I have not failed, I've just found 10,000 ways that won't work"
                                                     - Thomas Edison
Newsgroups: sci.electronics
From: tepponen@lut.fi (Jussi Tepponen)
Subject: Re: halogen lamps and infra-red emission
Date: Fri, 16 Oct 1992 12:59:25 GMT
Distribution: sci
Organization: Lappeenranta University of Technology, Finland
Keywords: halogen infra-red

ginger@hydrus.trl.OZ.AU (Jeremy Ginger) writes:


>I was "told" that halogen lamps emit infra-red rays.
>If so what sort of effect do they have on humans,

They might emit some infra-red rays (heat), but they
also emit UV-rays (from the high frequency end of spectrum)
These UV-rays might be harmfull for humans & animals.

There has been a lot of debate about the effect the halogen lamps
have for human eyes here in Finland. And as far as I know
the decorative halogen lamps for sale have to have a safety
glass or plastic mounted in. (Ie the lamp can not just have the
halogen blub). This glass or plastic should filter the UV-rays
(At least so called UV-A rays) which are not filtered by the Crystal
blubs of the halogen lamps.

No footer...yet.
From: pauls@trsvax.tandy.com
Date: 06 Oct 92 10:10 CDT
Newsgroups: sci.electronics
Subject: Re: Need advice on PCB packages for PC
Message-ID: <288200015@trsvax>
Nf-ID: #R:kakwa.ucs.ualberta.ca:17668:trsvax:288200015:000:541
Nf-From: trsvax.tandy.com!pauls    Oct  6 10:10:00 1992


For my 2 cents:

1) Schematic capture: OrCAD hands down. No contest.

2) PCB Layout: Tango PCB Plus is my favorite. I have used it extensively
for 6 years. Everything from 1 sided to 10 layers. I like it because:

	a) supports all kinds of video cards, including OLD ones
	b) the DRC is superb! It has NEVER missed an error.
	c) has wonderful OrCAD support.
	d) very easy to use, almost zero learning time

The only bad thing about Tango is that it is not the greatest for pure
analog work. But I still think it is a GREAT overall package.


Newsgroups: sci.electronics