chip swelling up and getting fried

[L.]

I knew a man once who claimed to have had either a CB or Ham radio antenna
as a part of a tree. He claimed it worked and others also backed him. I
never witnessed it myself, so I can't say for sure. I'm trying to recall HOW
he did it. It had something to do with spikes or nails and perhaps (not
sure) use them as a beam array of sorts with a vertical radiation.. I say
beam in that when you have a beam, you have a reflector, the driven element
and then the directors. I do believe that was his set up in the tree.

L.

 

[Norm Dresner]

"Chess Saurus" <chessaurus@yahoo.com> wrote in message
news:e722c26f.0408270501.5516cef0@posting.google.com...

I've got a prototyping problem, and I'm sure there's a neat, fast, and
inexpensive way to solve it --- I just haven't discovered it yet.

I have a 14-pin JTAG port (which expects the standard female ribbon
cable connector) which I need to wire down to small pads that are
in-circuit. Ideally, I'd like to solder wire-wrap gage wire. The
standard ribbon cable wires are frail and not very suitable for
wiring.

I know I could make a PCB with another 14-pin ribbon connector which
goes to 14 individual wirewrap posts, but -- there has to be an easier
way.

Any help will be greatly appreciated.

There are male headers that mate with std IDC female connectors on the top
that have wire wrap posts on the bottom. An alternative is to replace the
14-pin connector with a 14-pin DIP-form factor IDC part that goes to a
standard wire wrap socket.

Norm

 

[dan]

What's that Lassie? You say that Mark Haase fell down the old
sci.electronics.misc mine and will die if we don't mount a rescue by
Wed, 09 Jun 2004 23:56:52 -0400:

All steppers that I've seen are spec'ed for a certain resolution, ie.
1.8 deg or 3.6 deg, etc. I want to control a sonar "head" with a high
degree of accuracy. I already have two Hitec HS-311 servos, and was
plannign on using these, but the stepper's ability to rotate 360 degrees
will be very helpful for performing localization with the sonar. I'm
just wondering, am I losing a significant amount of resolution with the
servo?

The stepper's res. is based on the steps.

The servo's res. will be based on the encoder attached to it, and the
servo amplifier's error.

In the stepper system, the driver advances one step, and the stepper
motor follows.

In a servo system the encoder gives the motors position to the servo
amplifier and it compares this with the desired position to get the
error. The amplifier then sends current to the servo motor to make
the motor move into the proper position, reducing the error.

--

Dan

 

[Si Ballenger]

All steppers that I've seen are spec'ed for a certain resolution, ie.
1.8 deg or 3.6 deg, etc. I want to control a sonar "head" with a high
degree of accuracy. I already have two Hitec HS-311 servos, and was
plannign on using these, but the stepper's ability to rotate 360 degrees
will be very helpful for performing localization with the sonar. I'm
just wondering, am I losing a significant amount of resolution with the
servo?

I've gotten ~426 discrete movements in the ~200 deg turn range of
a Tower Hobbies RC servo. This was using the Kronos Robotics
ezservo chip. With stepper motors you can use reduction gearing
to get about any degree of accuracy. You may want to check the
comp.robotics.misc news group for more info.

 

[Allan Adler]

In reply to my old question:

I'm told that the printer port of a PC clone is popular for interfacing
experiments. I have a cheap laptop I'd like to use for this purpose.
I don't know beans about the printer port, neither its pinout nor
how to read from it or write to it (this would be under Linux).

Tomi Holger Engdahl <then@jolly.cs.hut.fi> write:

For the output side I have writen a document on that to
http://www.hut.fi/Misc/Electronics/circuits/parallel_output.html
There are examples/information for DOS, Windows and Linux.

I was just now following up on this and looked at the website. At the
beginning is a warning that the parallel port is easily damaged and
that might make it necessary to replace the mother board. Accordingly,
the message recommends that one consider getting a second io card with
its own parallel port.

I'm not sure, but I think the website is written under the assumption that
the reader did not take this advice. If I'm right about that, what I would
like to know is how the information at the site needs to be modified to
use a second parallel port on an extra io card. Under Linux, one has to
be able to explain the second io card, etc., to the operating system,
and I haven't so far learned how to explain to myself how to explain
things to the operating system. I'm slowly reading Linux Device Drivers
but I'm still far from understanding anything.
--
Ignorantly,
Allan Adler <ara@zurich.csail.mit.edu>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.

 

[Jim Thompson]

On Sun, 29 Aug 2004 01:17:58 GMT, Don Bruder <dakidd@sonic.net> wrote:

Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004. Short form: I'm trashing EVERY E-mail that doesn't contain a password in the subject unless it comes from a "whitelisted" (pre-approved by me) address. See <http://www.sonic.net/~dakidd/main/contact.html> for full details.

Hi Don,

I like your "whitelist" technique. I've been considering something
similar, except I've been trying to develop an automated daily
password change ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Mjolinor]

"Smokeyone" <mailstarclipper@btopenworld.com> wrote in message
news:e264a9ed.0408210000.74fffd69@posting.google.com...

On the off chance someone on this group understands lpg car
conversions ( no luck with the lpg group) - I am trying to find out
about the change over switch, small rectangular black plastic box -
six wires in, two way switch and a couple of led's. Believe there are
a few electronic components inside. I am after either a new switch or
better still a slightly smaller switch or even better a way of making
my own. Two way switch is no problem it's the electronic bit that got
me stumped.

Thanks in hope

Smokeyone

They are all different depending on the manufacturer of the LPG system.

 

[Roger Gt]

"James Newton" <jamesnewton@geocities.com> wrote in message
news:545d8ce4.0408292016.46f45b26@posting.google.com...
: notme@privacy.net (dan) wrote in message
news:<413099e7.6543651@News.Individual.net>...
: > What's that Lassie? You say that Mark Haase fell down the old
: > sci.electronics.misc mine and will die if we don't mount a
rescue by
: > Wed, 09 Jun 2004 23:56:52 -0400:
: >
: > In the stepper system, the driver advances one step, and the
stepper
: > motor follows.
: >
:
: Don't forget microstepping! You can get the stepper motor to
come to
: rest BETWEEN two steps by turning on both coils half way and so
on to
: 16 or more divisions between each actual step.
:
: There is a rather complete discussion of this at
: http://techref.massmind.org/io/stepper/linistep/smoother

It is possible to achieve micro steps in the order of 10
increments between the native increments. I have used
Microsteppers with 2000 steps per revolution (200 * 10) They are
incredibly smooth!

 

[E. Rosten]

Allan Adler wrote:

In reply to my old question:

Hmm, the original message isn't on my server, so I'll reply here.

I'm told that the printer port of a PC clone is popular for interfacing
experiments.

Yes, it is a very useful interface. I've used it many times. Even
remotely modern parallel ports can easily go beyond 8MB/s (ie 1MHz clock
rate), without using any of the fancy ECP or EPP modes.

I have a cheap laptop I'd like to use for this purpose.
I don't know beans about the printer port, neither its pinout nor

This is a very good website. I learned all my interfacing stuff from it:

http://www.beyondlogic.org/

how to read from it or write to it (this would be under Linux).

It depends on what you want to do. Raw bit twiddling is the same as
under any OS, you use the out, inb instructions. There are C library
wrappers for these. You need the program to be run as root, though, or
you'll need to write an suid wrapper to gain access to those
instructions. Be warned about bit-twiddling: Linux is not a real-time
OS, (though there are extensions for that and aparently 2.6 makes life a
lot better), so if you need precise timings, you will have to be a bit
careful. For non raw bit twiddling, I've no idea, sorry.

I was just now following up on this and looked at the website. At the
beginning is a warning that the parallel port is easily damaged and
that might make it necessary to replace the mother board.

Most these days seem pretty well protected for shorts to 0 or 5 volts
(from experience . But I wouldn't reccoment relying on this. Yiu can
always rig up a simple cable with 5K resistors on every wire to protect
yourself.

Accordingly,
the message recommends that one consider getting a second io card with
its own parallel port.

I'm not sure, but I think the website is written under the assumption that
the reader did not take this advice. If I'm right about that, what I would
like to know is how the information at the site needs to be modified to
use a second parallel port on an extra io card. Under Linux, one has to
be able to explain the second io card, etc., to the operating system,
and I haven't so far learned how to explain to myself how to explain
things to the operating system. I'm slowly reading Linux Device Drivers
but I'm still far from understanding anything.

If the parallel port obeys the same interface as a standard one (they
often do), you can do the same inb/outb twiddling from a userspace
program, just at a different port number instead.

-Ed




--
(You can't go wrong with psycho-rats.) (er258)(@)(eng.cam)(.ac.uk)

/d{def}def/f{/Times findfont s scalefont setfont}d/s{10}d/r{roll}d f 5/m
{moveto}d -1 r 230 350 m 0 1 179{1 index show 88 rotate 4 mul 0 rmoveto}
for /s 15 d f pop 240 420 m 0 1 3 { 4 2 1 r sub -1 r show } for showpage

 

[NO SPAM]

"Roger Gt" <not@here.net> wrote in message
news:wVKYc.9731$QJ3.4766@newssvr21.news.prodigy.com...

"wwaaves" <mthorpe@gmail.com> wrote in message
news:a3c18ea.0408300933.44b81be6@posting.google.com...
: "L." <FFSTA17NO@SPAMACCESS995.COM> wrote in message
news:<t4oXc.309$Ae.139@newsread1.dllstx09.us.to.verio.net>...
: > I knew a man once who claimed to have had either a CB or Ham
radio antenna
: > as a part of a tree. He claimed it worked and others also
backed him. I
: > never witnessed it myself, so I can't say for sure. I'm trying
to recall HOW
: > he did it. It had something to do with spikes or nails and
perhaps (not
: > sure) use them as a beam array of sorts with a vertical
radiation.. I say
: > beam in that when you have a beam, you have a reflector, the
driven element
: > and then the directors. I do believe that was his set up in
the tree.
:
: > L.
:
: A professor of mine once told me of his friend in a ham radio
club who
: used a tree as the antenna for a transceiver during a field
hunt.
: After searching for the target for hours he finally told the
group
: that he worked on research during WWII using trees as antennas.
Sounds
: like the military has been doing this for years.

Well, mostly in WW2.
It has been dome many times in field installations where hiding
was necessary.

I say, whatever it takes... If it works, DO IT! ANYTHING is better than
nothing when you're in a bind. Who knows, maybe someone will live in a place
where no "antennas" are allowed, not to mention towers, mast, etc. IF there
is a tree there, they could use it and no one be the wiser. Maybe it won't
work as well as a commercial job, but if you want to be on the air, then the
tree beats nothing (at least speaking outdoors). There are 2 meter antennas
which have been on the market for a while to be "stealth" antennas for areas
which don't like antennas. Ya got to do what ya got to do.

NS

 

[Roger Gt]

"NO SPAM" <NOSPAM@NOSPAM.COM> wrote in message
news:v9NYc.568$Ae.348@newsread1.dllstx09.us.to.verio.net...
:
: "Roger Gt" <not@here.net> wrote in message
: news:wVKYc.9731$QJ3.4766@newssvr21.news.prodigy.com...
: >
: > "wwaaves" <mthorpe@gmail.com> wrote in message
: > news:a3c18ea.0408300933.44b81be6@posting.google.com...
: > : "L." <FFSTA17NO@SPAMACCESS995.COM> wrote in message
: > news:<t4oXc.309$Ae.139@newsread1.dllstx09.us.to.verio.net>...
: > : > I knew a man once who claimed to have had either a CB or
Ham
: > radio antenna
: > : > as a part of a tree. He claimed it worked and others also
: > backed him. I
: > : > never witnessed it myself, so I can't say for sure. I'm
trying
: > to recall HOW
: > : > he did it. It had something to do with spikes or nails and
: > perhaps (not
: > : > sure) use them as a beam array of sorts with a vertical
: > radiation.. I say
: > : > beam in that when you have a beam, you have a reflector,
the
: > driven element
: > : > and then the directors. I do believe that was his set up
in
: > the tree.
: > : >
: > : > L.
: > :
: > : A professor of mine once told me of his friend in a ham
radio
: > club who
: > : used a tree as the antenna for a transceiver during a field
: > hunt.
: > : After searching for the target for hours he finally told the
: > group
: > : that he worked on research during WWII using trees as
antennas.
: > Sounds
: > : like the military has been doing this for years.
: >
: > Well, mostly in WW2.
: > It has been dome many times in field installations where
hiding
: > was necessary.
: >
: >
:
: I say, whatever it takes... If it works, DO IT! ANYTHING is
better than
: nothing when you're in a bind. Who knows, maybe someone will
live in a place
: where no "antennas" are allowed, not to mention towers, mast,
etc. IF there
: is a tree there, they could use it and no one be the wiser.
Maybe it won't
: work as well as a commercial job, but if you want to be on the
air, then the
: tree beats nothing (at least speaking outdoors). There are 2
meter antennas
: which have been on the market for a while to be "stealth"
antennas for areas
: which don't like antennas. Ya got to do what ya got to do.
:
: NS
:
Gutters work too! As will a wire run under the eves. I have even
run a single strand of wire up a tree and used it as an antenna,
the tree loads the wire so tuning was dicey. I have also used
aluminum foil in the attic. Works fine too.

An antenna hidden inside a vent extension will sometimes go for
years before someone notices. I have also see a mobile antenna
on a the back of a trellis in the rear garden. Buried the feed
line.

 

[BobGardner]

You can get the stepper motor to come to
rest BETWEEN two steps by turning on both coils half way and so on to
16 or more divisions between each actual step.

=============================

So why stop at 16 microsteps per step? A pair of 8 bit dacs putting outsin and
cos to the coils would give 256 usteps per step

 

[Bill Velek]

Jeff wrote:

Many others have given excellent responses, however, one other suggestion is
to use a AVR microcontroller. These are much easier to write code for, as
the cpu is laid out much nicer.

www.atmel.com -> AVR microcontrollers

Thanks, Jeff. I'll take a look at it.

Bill Velek -- remove the "--NO-SPAM--" from my email address

 

[James Sweet]

"Bill Velek" <billvelek--NO-SPAM--@alltel.net> wrote in message
news:iFrZc.403$ke.335@fe39.usenetserver.com...

Jeff wrote:
Many others have given excellent responses, however, one other
suggestion is
to use a AVR microcontroller. These are much easier to write code for,
as
the cpu is laid out much nicer.

www.atmel.com -> AVR microcontrollers

Thanks, Jeff. I'll take a look at it.

Bill Velek -- remove the "--NO-SPAM--" from my email address

I'll definitly second that, there's a few good BASIC compilers for the AVR,
they're leaps and bounds ahead of the now archaic (but still just as
expensive as when it came out) BASIC Stamps. I've gotten AVR chips for as
cheap as a buck each on ebay.

 

[Watson A.Name - \"Watt Su]

"wylbur37" <wylbur37nospam@yahoo.com> wrote in message
news:8028c236.0409020128.29791983@posting.google.com...

For the typical flashlight battery (AAA, AA, C, D),
all of them are 1.5 volts, but how much current do they offer?
(I'm guessing it's around 100 to 150mA, and it varies according
to the type of load that's on it).

And does it differ according to the battery size?
(does a "D" cell offer more current than an "AA"?)
or is it just that the D lasts longer?

It depends. For AA cells, the digital cameras draw more than a half amp
at times. D cells can handle much more than an amp. If you want the
batteries to last longer, then the current drain should be less. We're
talking about alkalines here.

 

[Al]

In article <8028c236.0409020128.29791983@posting.google.com>,
wylbur37nospam@yahoo.com (wylbur37) wrote:

For the typical flashlight battery (AAA, AA, C, D),
all of them are 1.5 volts, but how much current do they offer?
(I'm guessing it's around 100 to 150mA, and it varies according
to the type of load that's on it).

And does it differ according to the battery size?
(does a "D" cell offer more current than an "AA"?)
or is it just that the D lasts longer?

Google search yielded:

http://professional.duracell.com/start.asp?section=product_data&page=alka
line&hardload=chemistrylist&chemistry=alkaline&lang=english

al

 

[Bob Myers]

"Doyle" <dndowd13@charter.net> wrote in message
news:2b10adbe.0409020916.616b33d8@posting.google.com...

I am looking for a material that either glows or changes color in the
presence of RF energy. I have found nothing so far so any help at this
point would be appreciated.

Can you be a little more specific? Do you need a solid, a
liquid, or a gas? How much RF?

For instance, a standard neon lamp (the NE-2 variety) has
very commonly been used to check for the presence of RF
around various HF transmitter bits...

Bob M.

 

[Roger Gt]

"Doyle" <dndowd13@charter.net> wrote in message
news:2b10adbe.0409020916.616b33d8@posting.google.com...
: I am looking for a material that either glows or changes color
in the
: presence of RF energy. I have found nothing so far so any help
at this
: point would be appreciated.
:
: Thanks,
: Doyle

Ordinary Florescent lames work, as do Neon lamps.
The fluorescents are more impressive.

I've used them to show standing waves on an antenna.
Like a magic wand the brightness varies with the signal strength.

The external envelope is glass so there is no possibility of a
shock. You can hold the tube in your hand.

 

[CWatters]

"wylbur37" <wylbur37nospam@yahoo.com> wrote in message
news:8028c236.0409020128.29791983@posting.google.com...

For the typical flashlight battery (AAA, AA, C, D),
all of them are 1.5 volts, but how much current do they offer?
(I'm guessing it's around 100 to 150mA, and it varies according
to the type of load that's on it).

GP 3000/3300 Sub C NiMH cells (not quite typical flashlight batteries) have
been used in model aircraft to power motors drawing 150A+ (yes that's One
hundred and fifty Amps). In shorts bursts I should add.

http://ewc2004.users.btopenworld.com/BEFA/photographs.htm

One team had a few cells explode - not surprising really.

http://www.rcgroups.com/forums/attachment.php?attachmentid=288470&stc=1

 

[R. Steve Walz]

Doyle wrote:

I am looking for a material that either glows or changes color in the
presence of RF energy. I have found nothing so far so any help at this
point would be appreciated.

Thanks,
Doyle
------------

Flourescent tube glows. If you need it smaller, pump out a tiny tube
after painting inside it with the rare earths white stuff from a
white fluoro tube.

-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public