Driver to drive?

[Lady Chatterly]

In article <iZoFd.674318W1.55325@news.easynews.com>
Parse Tree <account@domain.extension> wrote:

I think pugly means pug ugly, so I'm just guessing here.

They know it, so far you are filth.

--
Lady Chatterly

"The imprimatur of Lady Chatterly. I'm so jealous." -- Dr. Zen

 

[Kryten]

"Mark Jones" <abuse@127.0.0.1> wrote in message
news:l_-dnYuStv2an3vcRVn-3g@buckeye-express.com...

Once about 20 years ago I ripped apart a typical older-style alarm
clock, you know the kind with two "gongs" on top. All that was inside
was a coil and some laminations & gears - typical synchronous motor
stuff. But the electrical cord was polarized. I thought "now why in
the hell does an AC motor need to be polarized?" So yep, I cut the
cord and reversed it to watch the clock run in reverse... instead it
went KABOOM!

Why?

If it was just AC going to just the motor, it should be okay.

I'm guessing the Live and Neutral wires also went elsewhere,
and that the two became connected...

 

[Tim Shoppa]

be harnessed to build a multiplication out of other
kinds of mathematical operations. There are _three_ classic ones.
Everybody (who is an analog hotshot anyway, or reads textbooks) knows
_two_ of them: the log-antilog identity, and the quarter-square
identity (given recently in this thread). What is the third?
Cheers -- Max

Nobody else has stepped up to bat, so I'm going to give my answer:
logical ANDing of PWM streams?

(I believe this is described in the MIT Radiation Lab series on
waveform operations.)

Tim.

 

[j.b. miller]

What part of the World are you in?
I have a couple of BASIC Stamp-2's and the motherboard that can be had for a
good price.
Easy to programme,lots of info on the web...

Jay in Greensville,Ontario

 

[Winfield Hill]

Jo (Joanne) wrote...

Hi, Apologies for intruding on your NG's. I was just wondering if
anyone remembers Mike Crimmins? He used to post here. Mike passed
away in September of 2004, after a long battle with a variety of
medical problems, a few months after his 50th birthday. I would love
to hear from anyone who knew him. He loved his Chemistry, nature hikes
on Massachusetts trails and in quarries, used to talk in his sleep
about polymers, molecules, and Linux, and could make the meanest batch
of chili you ever tasted! He is sadly missed.

He sounds like a fine man, we are sorry for your loss.

It looks like he posted as Michael or Mike Crimmins in the sci.chem,
sci.engr.chem, sci.chemistry, sci.chem.coatings, sci.research.careers,
sci.engr.biomed, sci.polymers, alt.coatings.paint, and alt.inventors
groups among others. I don't think we saw much of him here in s.e.d.

It looks like a he recently got a Mazda Miata M2, and was interested
in aftermarket mod kits. He must have enjoyed that car.


--
Thanks,
- Win

 

Uh, no.

 

[Stuart Brorson]

In sci.electronics.cad Chuck Harris <cf-NO-SPAM-harris@erols.com> wrote:
:> gEDA (has schematic caputre, attribute management, netlisting,
:> archiving, and other utilties useful for design):
:> http://www.geda.seul.org/

: The gEDA system is a very nice idea... It is truly a shame that it
: is packaged with insufficient thought to portability.

I'm sorry to hear that you have problems installing gEDA. It seems to
work for many other people. I am one of the active developers.
Accordingly, I am always interested in specific bug reports so I can
then fix problems, and robustify the application. Therefore, can you
please be more specific? I'd be happy to fix whatever I can if I had
some hard information.

Particularly relevant info:

* Linux distro & revision level
* Installation flavor (i.e. RedHat comes in "personal", "workstation",
"server", and so on. SuSE comes in "personal" and "professional").

: It wants the
: system libraries it uses to be stuffed in non standard places inorder for
: it to find them. It doesn't recognize that Redhat, and some of the
: other distributions use differing names for some of the normal system
: libraries. (GTK+ 2 comes to mind)

If you build it from source (or use the CD) the "configure" step takes
care of all of this -- in principle. If it isn't working for you, we
would like to fix it. Please report: Which system libs go in
non-standard places, what are the non-standard places, and what
method of installation are you using? Also, what type of system do
you use (i.e. Linux distro)?

: If you want to install the gEDA system so it is available to all users on
: a multiuser system, you have to give all of those users root privileges on
: certain system directories...There is no excuse for that!

Which system directories? And what method of installation?

: All of the example designs are broken in such a way that they cannot find
: the active components to put on the schematic.

This is an interesting point. I can look into this. I don't know how
the lib search paths are set in the examples. I believe they are
configurable when you install from source, but if you are using a
binary distro, then they might be hardcoded.

: There are no examples or documents describing how the project manager is
: supposed to work. Saying it is obvious isn't much help.

True, certain things lack documentation. That problem is being
worked, but ever-so-slowly. Please remember that gEDA is a volunteer
effort, and getting engineers to document their stuff is not always
easy. You probably know this.

: The CDROM that was issued the other day is even worse than useless. It
: chugs and churns, but it doesn't notice that it cannot find certain libraries,
: and it just goes on like everything is ok. It also rebuilds and installs
: the symbol libraries so many times I thought it was stuck in a loop.

Again, what Linux distro & rev level are you using? The CD was tested
on several modern Linux variants. In the CD's README are listed the
systems which will and won't work. Did you read the README?

: Close, but not quite ready for prime time.

With some work, and specific info about problems, it will become ever
more polished over time. Keep in mind that generalized kvetching is
cheap 'n easy, but offering bug details will help everybody.

Thank you for your detailed bug report.

Stuart

 

[Chuck Harris]

Hi Stuart,

Stuart Brorson wrote:

In sci.electronics.cad Chuck Harris <cf-NO-SPAM-harris@erols.com> wrote:

: The gEDA system is a very nice idea... It is truly a shame that it
: is packaged with insufficient thought to portability.

I'm sorry to hear that you have problems installing gEDA. It seems to
work for many other people. I am one of the active developers.
Accordingly, I am always interested in specific bug reports so I can
then fix problems, and robustify the application. Therefore, can you
please be more specific? I'd be happy to fix whatever I can if I had
some hard information.

Particularly relevant info:

* Linux distro & revision level
* Installation flavor (i.e. RedHat comes in "personal", "workstation",
"server", and so on. SuSE comes in "personal" and "professional").

RedHat 9, Workstation, upgraded to the latest fixes on FreshRPM's apt-get
repository.

: It wants the
: system libraries it uses to be stuffed in non standard places inorder for
: it to find them. It doesn't recognize that Redhat, and some of the
: other distributions use differing names for some of the normal system
: libraries. (GTK+ 2 comes to mind)

Redhat 9 calls GTK+ 2.0 GTK2, but your configuration scripts are looking for
GTK+-2.0 So they don't find GTK2, and back down to GTK+ 1.2

Your scripts on the latest version of gSchem cannot find the dynamic links
for libstroke, or libgdg* , even though they are in /usr/local/lib (with
all the other libraries it did find):

$ ls /usr/local/lib/libst*

/usr/local/lib/libstroke.a /usr/local/lib/libstroke.so.0
/usr/local/lib/libstroke.la /usr/local/lib/libstroke.so.0.0.5
/usr/local/lib/libstroke.so

$ ls /usr/local/lib/libgdg*
/usr/local/lib/libgdgeda.a /usr/local/lib/libgdgeda.so.6
/usr/local/lib/libgdgeda.la /usr/local/lib/libgdgeda.so.6.0.0
/usr/local/lib/libgdgeda.so

$ ldd `which gschem`

libstroke.so.0 => not found
libgeda.so.22 => /home/chuck/gEDA/geda-install/lib/libgeda.so.22 (0x40033000)
libguile.so.12 => /usr/lib/libguile.so.12 (0x4006f000)
libguile-ltdl.so.1 => /usr/lib/libguile-ltdl.so.1 (0x400fc000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x40103000)
libgdgeda.so.6 => not found
libpng12.so.0 => /usr/lib/libpng12.so.0 (0x40131000)
libm.so.6 => /lib/tls/libm.so.6 (0x40154000)
libglib-1.2.so.0 => /usr/lib/libglib-1.2.so.0 (0x40176000)
libgtk-1.2.so.0 => /usr/lib/libgtk-1.2.so.0 (0x4019b000)
libgdk-1.2.so.0 => /usr/lib/libgdk-1.2.so.0 (0x402e3000)
libgmodule-1.2.so.0 => /usr/lib/libgmodule-1.2.so.0 (0x4031b000)
libdl.so.2 => /lib/libdl.so.2 (0x4031f000)
libXi.so.6 => /usr/X11R6/lib/libXi.so.6 (0x40323000)
libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x4032b000)
libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x40339000)
libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x40418000)
libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x40421000)
libc.so.6 => /lib/tls/libc.so.6 (0x42000000)
libgdgeda.so.6 => /usr/local/lib/libgdgeda.so.6 (0x40439000)
libz.so.1 => /usr/lib/libz.so.1 (0x4046b000)
libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x40479000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)

If you build it from source (or use the CD) the "configure" step takes
care of all of this -- in principle. If it isn't working for you, we
would like to fix it. Please report: Which system libs go in
non-standard places, what are the non-standard places, and what
method of installation are you using? Also, what type of system do
you use (i.e. Linux distro)?

In the past, using source and ./configure, make, and make install, it did
do the right thing, but this latest 2004 release behaves differently.

: If you want to install the gEDA system so it is available to all users on
: a multiuser system, you have to give all of those users root privileges on
: certain system directories...There is no excuse for that!

Which system directories? And what method of installation?

This comes directly from one of the documentation file included with gEDA. If you
install using root, ./configure will put everything in the '/usr/local/' tree,
including all of the project files, and other files the user generates. I cannot
find the exact doc file where I found this written, but that file says that the
users must have write privileges on the /usr/local tree inorder to use the
system if it is installed that way. The author made it sound like something
that everyone would do... A very stupid windowsesque sort of thing.

: All of the example designs are broken in such a way that they cannot find
: the active components to put on the schematic.

This is an interesting point. I can look into this. I don't know how
the lib search paths are set in the examples. I believe they are
configurable when you install from source, but if you are using a
binary distro, then they might be hardcoded.

All of the transistors, diodes and IC's used in the example programs are
located in a subdirector or the individual example program. There is no
info present that explains how to encourage gSchem to connect the two.
Presumably that info would in the project file used for the project where
these examples reside... only no project files are included.

: There are no examples or documents describing how the project manager is
: supposed to work. Saying it is obvious isn't much help.

True, certain things lack documentation. That problem is being
worked, but ever-so-slowly. Please remember that gEDA is a volunteer
effort, and getting engineers to document their stuff is not always
easy. You probably know this.

I very much understand this. But at this time, it is well below the usual
level of documentation found in Gpl'd software.

: The CDROM that was issued the other day is even worse than useless. It
: chugs and churns, but it doesn't notice that it cannot find certain libraries,
: and it just goes on like everything is ok. It also rebuilds and installs
: the symbol libraries so many times I thought it was stuck in a loop.

Again, what Linux distro & rev level are you using? The CD was tested
on several modern Linux variants. In the CD's README are listed the
systems which will and won't work. Did you read the README?

Absolutely! And I am running RedHat 9, a system that should work... All
the versions of my various tools are at or above the rev levels required.

The first time I ran the CDROM install, it built and installed the symbols
libraries at least 20 times before I killed the process. (I was getting
curious as to why it was taking so long, and why every hour or so I would
look at it and it was building the symbols yet again.)

: Close, but not quite ready for prime time.

With some work, and specific info about problems, it will become ever
more polished over time. Keep in mind that generalized kvetching is
cheap 'n easy, but offering bug details will help everybody.

I have a definite desire for gEDA to succeed, as I think
GPL'd software is the future. But at this stage, gEDA 20041228
shouldn't have been released to the public. If a guy like me who
has been working with unix for 30 years, and linux since the first
slackware distribution can't make your package work, how much chance
does anyone else have?

-Chuck

 

[lewisA]

I'm in Illinois, and I would be interested.
Email me at lewis at wfoondirt dot com

Thanks

 

[Aunty Kreist]

"Parse Tree" <account@domain.extension> wrote in message
news:iZoFd.674318$2W1.55325@news.easynews.com...

Aunty Kreist wrote:
"keith" <krw@att.bizzzz> wrote in message
newsan.2005.01.13.02.35.30.630303@att.bizzzz...

On Wed, 12 Jan 2005 02:01:28 -0500, Aunty Kreist wrote:


"keith" <krw@att.bizzzz> wrote in message
newsan.2005.01.12.02.51.59.549035@att.bizzzz...

On Mon, 10 Jan 2005 22:14:19 -0600, Rhyanon wrote:


"keith" <krw@att.bizzzz> wrote in message
newsan.2005.01.09.03.08.49.102774@att.bizzzz...

On Sat, 08 Jan 2005 18:59:35 -0500, Aunty Kreist wrote:


I take it you don't have glasses then.

TO correct cross-posting, they have to catch it when you're young.


Nip it in the bud?

I'm sure you'd quite like that, but I'm a married man.

--
Keith


My condolences.

Why? Jealous? Sorryec3ht it's been 33.5 years. ...and you're ugly.

--
Keith



Nope, not jealous...married myself ( but thankfully not to a super-geek
like
you)

Oh, yer fugly too....neener neener

Does fugly mean fuckin' ugly?

I think pugly means pug ugly, so I'm just guessing here.

Yep...or as our beloved Rhy likes to say.. "Fug-LAY"

 

[Ken Smith]

In article <1105622304.460977.261970@z14g2000cwz.googlegroups.com>,
Tim Shoppa <shoppa@trailing-edge.com> wrote:

be harnessed to build a multiplication out of other
kinds of mathematical operations. There are _three_ classic ones.
Everybody (who is an analog hotshot anyway, or reads textbooks) knows
_two_ of them: the log-antilog identity, and the quarter-square
identity (given recently in this thread). What is the third?
Cheers -- Max

Nobody else has stepped up to bat, so I'm going to give my answer:
logical ANDing of PWM streams?

That either has to be disqualified as not really analog or we have to
increase the number of methods.

You can multiply with an MG set. On a generator RPM * FieldCurrent * K
gives the output voltage.

We may have to increase it anyway because you can do it electro-thermally.

--
--
kensmith@rahul.net forging knowledge

 

Thanks for the useful info...

Arny Krueger wrote:

elephantcelebes@yahoo.com> wrote in message
news:1105591362.659082.160340@f14g2000cwb.googlegroups.com

Tell you what, I will admit that Cal's post is wrong if you will
tell
me the problems with PC's and sound cards. I am intrigued because I
use a PC based setup in my day job for some testing that happens to
fall into the audio frequency band.

Ever worked with a *real* THD analyzer? You probably have, right?

Admittedly, no. My day job application uses the sound card and my own
program to analyze some non-audio circuits that happen to work in the
audio frequency range. I am more concerned about shortcomings of the
sound card as a measurement device, and not about audio specific test
software. Your comments are reassuring.

Naturally I have undertaken to ensure that my results are meaningful.
For my use, I have to apply a calibrated physical stimulus to the
sensor, and this make my results somewhat self-verifying.

If you have, you know that they have input and output level controls
that
allow them to be used over a wide range of signal levels. Usually the
output
level control is more limited, but the input level controls on real
THD
analyzers can handle signals from less than a volt to several hundred
volts.
They also typically have a pretty good audio voltmeter function that
you can
use to set levels.

If you use a sound card for audio measurements, you pretty well have
to add
a good audio voltmeter and some kind of attenuator, particularly if
you want
to work with power amps.

For my home hobby, I have mainly looked at preamps and speaker
response. My main pet peeve is the lack of a calibrated voltage scale
on the sound card. This requires me to stick with relative
measurements, or check levels using my scope or voltmeter.

I could see how a sound card plus additional test equipment and
ingenuity would be adequate for casual audio testing, but that a real
test rig would make the whole process a lot quicker and easier.

 

[john jardine]

<uvcceet@juno.com> wrote in message
news:41e71305$1$woehfu$mr2ice@news.aros.net...

Hi,

I don't know all that much about video and buffering it but am always
willing, and hoping to learn.

I have two broadcast video feeds that I need to switch between, using an
analog switch. Assuming that all the gain and output loading requirements
of each feed are already dealt with behind the switch by the previous
designer, I think I just need a unity gain buffer on the output side of
the switch since the switch itself cannot drive any loads, and needs to be
protected from the outside world as well.

I admit that don't know the best way to configure the output buffer. I am
picking up an existing design and trying to learn my way through it, as it
should be obvious I am not all that learned in such things. I do search
web sites and app notes, but its possible that this one is just too simple
for them to bother with, or I am not looking in the right place.

I am figuring a EL2244 or equivalent. Does it require a feedback ckt, a
resistor between the output and the negative input, or just the output
tied back to the inverting input? (not very good at ascii art yet) Since I
seek unity gain, is it just a 750 ohm from output to inverting input, and
from there another 750 ohm to ground?

I am looking at one schematic where the output of such an analog switch is
an LT1361 (righteous bucks for that! <g&gt and it is just video into the +,
and a 750 ohm feedback to the - input. Not knowing what is going on back
upstream, I can't guess exactly why that value was chosen, and if it is
needed, or just a designer's method that works as well as other
configurations.

I am doing is reading app notes, and looking at existing designs trying
to learn on the fly, and I am not seeing a lot of consistency in what is
done, so I gather there are many opinions, and they all work, but since I
don't know the designers, I can't ask them what they were thinking, and
why they chose what they did.

That leads me to this group, and hopefully its not too inane a question to
be asking.

I like to hear about web sites I can learn this from, so pointers would
be gratefully accepted as well as opinions on how to configure this
buffer.

Thanks for your consideration.

John

The cheap TSH94 quad video opamp (+/-5V supply) has two of its amps designed
to be logic switchable to an 'on' or 'off' state. The logic 'standby' pins
are opposite action, so if the two logic control pins are tied together,
then a logic 0V will switch ON amp 1 and switch OFF amp 2 and vice-versa for
a logic HIGH. The operation takes 200nS.
Therefore what we have here, is a direct acting video switch, that can be
used for OSD insertion. I.e. 2 video feeds to the amps, one video out, a
particular video selected by the logic level on the control pin. The 2 amps
are just wired as voltage followers and then both their output pins wired
together. 200nS is adequate for run of the mill NTSC or PAL signals and
gives quite a clean 'edge' to the inset video.
As these are video amps anyway, then they can directly drive the 75ohms coax
feeding a monitor or suchlike. The two spare amps could then be used as
preamps or X2 amps back-terminated cable drivers etc.
[NB. If your "Broadcast Video Feeds" are 'real' broadcast studio quality
then ignore the foregoing, as the switch over is not fast enough!].
regards
john

 

[keith]

On Wed, 12 Jan 2005 23:39:48 -0500, Aunty Kreist wrote:

"keith" <krw@att.bizzzz> wrote in message
newsan.2005.01.13.02.35.30.630303@att.bizzzz...
On Wed, 12 Jan 2005 02:01:28 -0500, Aunty Kreist wrote:


"keith" <krw@att.bizzzz> wrote in message
newsan.2005.01.12.02.51.59.549035@att.bizzzz...
On Mon, 10 Jan 2005 22:14:19 -0600, Rhyanon wrote:


"keith" <krw@att.bizzzz> wrote in message
newsan.2005.01.09.03.08.49.102774@att.bizzzz...
On Sat, 08 Jan 2005 18:59:35 -0500, Aunty Kreist wrote:


I take it you don't have glasses then.

TO correct cross-posting, they have to catch it when you're young.


Nip it in the bud?

I'm sure you'd quite like that, but I'm a married man.

--
Keith


My condolences.

Why? Jealous? Sorryec3ht it's been 33.5 years. ...and you're ugly.

--
Keith


Nope, not jealous...married myself ( but thankfully not to a super-geek like
you)

"Super-geek"? There's that jealousy poking through again. In any
case, we "geeks" certainly are paid more better and have better working
conditions than than you *itches.

Oh, yer fugly too....neener neener

If prepending an 'f' is the best you can do, you really need a new pot.

--
Keith

 

[Randy McLaughlin]

"John Fields" <jfields@austininstruments.com> wrote in message
news:tk3eu0d9kjlgopb1rucmtjp3jk8d6pouk1@4ax.com...

On Tue, 11 Jan 2005 20:41:35 -0600, "Rhyanon" <pissoff@uberbitch.com
wrote:

I expect you to do what I compel you to do, dumbass. Now dance.

---
I compel you to expect the unexpected, pigfart.

I don't dance, don't ask me. And stop top posting.

--
John Fields

Please don't crosspost.

Randy

 

[Mr. T]

<elephantcelebes@yahoo.com> wrote in message
news:1105666718.943890.10880@f14g2000cwb.googlegroups.com...

For my home hobby, I have mainly looked at preamps and speaker
response. My main pet peeve is the lack of a calibrated voltage scale
on the sound card. This requires me to stick with relative
measurements, or check levels using my scope or voltmeter.

After you have checked it once, the levels should be nearly as consistant as
your scope or voltmeter. Nether of which have a current calibration
certificate I bet? Just make sure you don't use any variable software
attenuation.

I could see how a sound card plus additional test equipment and
ingenuity would be adequate for casual audio testing, but that a real
test rig would make the whole process a lot quicker and easier.

Quick, easy and wrong is simple to do, even with expensive equipment

MrT.

 

[Aunty Kreist]

"Randy McLaughlin" <randy@nospam.com> wrote in message
news:b0JFd.13867$tF.1007@bignews6.bellsouth.net...

"John Fields" <jfields@austininstruments.com> wrote in message
news:tk3eu0d9kjlgopb1rucmtjp3jk8d6pouk1@4ax.com...
On Tue, 11 Jan 2005 20:41:35 -0600, "Rhyanon" <pissoff@uberbitch.com
wrote:

I expect you to do what I compel you to do, dumbass. Now dance.

---
I compel you to expect the unexpected, pigfart.

I don't dance, don't ask me. And stop top posting.

--
John Fields

Please don't crosspost.

Randy

Follow your own advice, bee-yatch.

 

[Rhyanon]

HA - ha!! And now you're even being a hypocrite! I wonder if this was a
record speed for dweeb - yanking?

"John Fields" <jfields@austininstruments.com> wrote in message
news:tk3eu0d9kjlgopb1rucmtjp3jk8d6pouk1@4ax.com...

On Tue, 11 Jan 2005 20:41:35 -0600, "Rhyanon" <pissoff@uberbitch.com
wrote:

I expect you to do what I compel you to do, dumbass. Now dance.

---
I compel you to expect the unexpected, pigfart.

I don't dance, don't ask me. And stop top posting.

--
John Fields

 

[Tim Shoppa]

[Tungsten filaments, CdSe photocells, MOV resistor with exponential
curves]

Those are all interesting implementations, but they aren't a new
mathematical identity like Max was asking for. They're just varying
implementations of the exponent/logarithmic circuit.

One interesting thing about the CdSe photocells is that they're very
linear in electrical response while being nonlinear in optical
response. That has very real advantages in many applications.

Tim.

 

[Guy Macon]

WayneL wrote:

Guy Macon <http://www.guymacon.com/> wrote...

WayneL wrote:

I am writting a paper and it is fround upon to include web
address or usenet ref. It need it to be a printed publication.

The fact that you are writing a paper and that papers require
references is irrelevant. The fact remains that the basic
assumption behind your paper (that ultrapure water with no
dissolved gasses is something that one is likely to find as
a contaminant of standard electrical equipment) is flawed.

I suggest that you write a paper analysing what happens when
boysenberry jam contaminates electrical equipment. That would
be far more likely, and the jam would stay jam long enough
for you to take a resistivity measurement.

You seem determined to ignore the above advice. Care to tell
us why?

Vested interest.
Whilst I believe in the freedom of information the people who
pay for my research would like to be the first to know about it.
Thus one should not bite the hand that feed you.
I guess you may call it a balancing act.
I will share as much as I feel I can.

Nonresponsive answer noted. I still have no idea why you seem
determined to ignore the above advice.

I call writing a paper about contaminants in electrical equipment
that assumes a contaminant (gas-free ultrapure water) that will
never, ever be found in any electrical equipment to be quite a
good example of biting the hand that feeds you. But, if you
insist on screwing your customer with a bad analysis, who am
I to stand in your way?

Followups set. I am not interested in further discussion.