chip swelling up and getting fried

[Watson A.Name - \"Watt Su]

"Pippa" <send_pdreeves_no_spam@bigpond.net.au> wrote in message
newsan.2004.08.08.13.41.47.105161@bigpond.net.au...

On Sat, 07 Aug 2004 23:37:55 -0700, Sanjay Punjab wrote:

I go through alot of that "canned air" stuff.
Its great for cleaning electronics, computer keyboards etc. etc.
I have been wondering if alternate products like this are more
economical.
http://www.circuits2u.net/pages/CO-2-DBL.htm
http://www.allbrandelectronics.com/prod.itml/icOid/7899
These co2 cartrdiges are as cheap as 50 cents each, but its
difficult
to know how long they last compared to a 10 ounce can of canned air.
Just looking for some ideas.


Buy yourself an air compressor!

If you need to have a portable source of compressed air, fit a
schroeder
valve to an old canned air can, so you can re-pressureise it using the
air
compressor. The schroeder valve fittings are usually made of brass, so
are
very easy to solder into a hole punched in the can.

You would have to be careful not to put too much pressure into the can
because of the risk of explosion, but it wouldn't matter that you
cannot
store very much air in each can, just re-fill them when you get back
to
the workshop.

I used to do that with spray cans. I had two spray cans soldered
together so that I had double the volume. But one time I pumped it up
past 120 PSI, and the bottom turned inside-out! Whoa!

A schroeder valve is a car tyre valve.

Pip

 

[Watson A.Name - \"Watt Su]

"Johan Wagener" <johanwagener@webmail.co.za> wrote in message
news:c86a2c09.0408110333.3b889aa4@posting.google.com...

All connections double checked. All transistors checked and the all
have 0.8V on BE. Except for transistor 2 which has 1V over its BE?

Mic is a brand new miniature electret microphone which runs on 1V-10V
with 2Vnom

I don't even pick up the mains hum when I touch the input. I do
however get a small amplification of the microphone and when I connect
a 3V supply to the circuit I can hear sounds picked up by the mic, but
it is very faint.

Should I perhaps try using a LM741 as a preamp for the mic and then
send this signal into the Amplified Ear?

This circuit has plenty of gain if it is working right. The 1V on Q2
seems a bit off. I would remove the transistor and replace it with
another one.
Also check to make sure your capacitors are installed in the correct
polarity.

BTW, the circuit can be found at
http://www.electronics-lab.com/projects/audio/023/

Please send your suggestions

 

[CWatters]

"Valeri Beers" <theval2000@hotmail.com> wrote in message
news:425598a5.0408221644.3ba50114@posting.google.com...

Hello,
my uncle was an engineer with General Dynamics Corporation in
California back in the 60's and 70's. When he passed away, our family
found that he had left some books on electronics and engineering and I
was just wondering if any of these books were of interest to anyone.
Here is what I have:

Try auctioning them on e-bay?

 

[CWatters]

"Avayla Hoke" <Avayla19@anyclue.com> wrote in message
news:41293bc9@news01.argolink.net...

New comer to this newsgroup.

Newsgroup spammer more like.

 

[Zak]

Sanjay Punjab wrote:

I go through alot of that "canned air" stuff.
Its great for cleaning electronics, computer keyboards etc. etc.
I have been wondering if alternate products like this are more
economical.

If you can filter/dry the air or don't care that it is dirty, use a
compressor from a fridge.

Make it blow through a piece of the capillary tube you also get from the
fridge and you'll have a very nice blast of air.

However, these things spew oil and the air will not be dry. Some
filtering may be needed - and don't breathe those fumes.


Thomas

 

[Art]

Multi Wave Vertical with multiple stingers, Eh!! Just think how much power
you could pump into a 50' Oak before you blew the finals on the old CB.Eh??
"Allan Adler" <ara@nestle.csail.mit.edu> wrote in message
news:y934qmtpsy5.fsf@nestle.csail.mit.edu...

Since it has been remarked in another thread that wood is a conductor,
and since trees are as big as radio wavelengths, I'm wondering if there
is any convenient way to measure how much electromagnetic radiation a
particular tree is picking up at a particular radio frequency.

What started me wondering about this is not the desire to use trees
to pick up radio stations or to use forests for antenna arrays for
radio astronomy (although the thought did cross my mind), but an
article in a recent issue of Natural History about the visual systems
of plants. The article maintains that plants have sophisticated systems
that allow them to figure out how many other plants are around them,
even if they are not shaded by them, and to figure out when to flower,
among other things. The article is concerned with visible light and
infrared and discusses mechanisms at the molecular level that respond
to such light. I don't expect that plants have responses to radio waves
at the molecular level, for reasons of resolution (not that I really
know), but it did seem natural to wonder whether plants might have
some kind of response to radio waves when the plants are large enough
to serve as antennas at those frequencies.
--
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.

 

[Bennet Williams]

I tried that a couple of months ago. It's definitely a buyers market
for books. I sold 4 hardback Dean Koontz books for $5. Definitely not
worth the trouble.

BRW

On Mon, 23 Aug 2004 10:15:21 GMT, "CWatters"
<colin.watters@pandoraBOX.be> wrote:

"Valeri Beers" <theval2000@hotmail.com> wrote in message
news:425598a5.0408221644.3ba50114@posting.google.com...
Hello,
my uncle was an engineer with General Dynamics Corporation in
California back in the 60's and 70's. When he passed away, our family
found that he had left some books on electronics and engineering and I
was just wondering if any of these books were of interest to anyone.
Here is what I have:

Try auctioning them on e-bay?

 

[CWatters]

"Allan Adler" <ara@nestle.csail.mit.edu> wrote in message
news:y934qmtpsy5.fsf@nestle.csail.mit.edu...

Since it has been remarked in another thread that wood is a conductor,
and since trees are as big as radio wavelengths, I'm wondering if there
is any convenient way to measure how much electromagnetic radiation a
particular tree is picking up at a particular radio frequency.

In some farmed forrests trees are planted at regular intervals - might have
more of an effect?

 

[CWatters]

"Allan Adler" <ara@nestle.csail.mit.edu> wrote in message
news:y934qmtpsy5.fsf@nestle.csail.mit.edu...

Since it has been remarked in another thread that wood is a conductor,
and since trees are as big as radio wavelengths, I'm wondering if there
is any convenient way to measure how much electromagnetic radiation a
particular tree is picking up at a particular radio frequency.

I haven't look to see who wrote this article (or the quality of the science
behind the statements it contains) but you might find it interesting towards
the middle/bottom of the page.

http://www.leyman.demon.co.uk/08_Microwaves.html

 

[Jan-Erik Söderholm]

Hi !

www.microchip.com, details and data sheets for the PIC processors.
www.piclist.com, info about a PIC mailing-list.

http://www.voti.nl/swp/index.html, a nice intro to PIC.
http://www.st-anna-data.se/picdoc.zip, a PDF version of the same.

http://www.voti.nl/wisp628/index.html, one of the more popular
hobbyist/amateurs PIC programmers.

http://www.voti.nl/dwarf/index.html, a nice series of PIC based
building blocks. Flexible and reasonable cost.

Before anyone asks, no, the "voti" site is *not* mine
But I do use his stuff...

Regards,
Jan-Erik.

Bill Velek wrote:

While in the process of trying to find a solution to a problem, I
received several suggestions that PIC or Basic-Stamps might be a
solution. In order to fairly evaluate those suggestions, and decide
whether or not I'm capable enough to use that approach, I'd like to get
a good overview of what I'll be facing. I've joined another e-list for
basic-micros -- Parallax's forum -- but so far I haven't received an
adequate answer to the questions that I'll pose here. I _think_ this
would be on-topic here, and I hope no one minds.

What I'm looking for is links to sites that will give a broad general
explanation to a complete novice of the nature and potential of PIC and
Basic-Stamps; I've done a some googling without coming up with anything
that is very helpful, so I might be way off base right now.

My impression is that these are simply chips that can be programmed
(perhaps something like an EPROM?), but it is done with very simple
basic-language programs that are fairly short with relatively few
instructions, and that the programming is done on a computer and then
loaded onto the chip via a cable linking the chip and a PC. Then the
chip can be installed on a small circuit board of some sort (e.g., a
thermostat), after which it is then able to run the basic-program
completely independent of the PC. Besides my thermostat needs, I can
see possible future applications in my beer brewing hobby, so I am
definitely interested at this point; for example, if I'd eventually like
to build either a RIMS or HERMS (for non-brewers, that would be a
"Recirculating Infusion Mash System" using a magnetic pump to circulate
the liquid in the mash to help keep it uniform in pH and temp, and a
"Heat Exchange Recirculating Mash System" which also actually controls
the temp through various stages). Both of those systems can be designed
to be fully computerized with temp sensors, PID controllers, solenoid
valves, and magnetic pumps.

At this point I'm not seeking technical help to solve a specific
problem. Rather, I'd just appreciate some insight into what I'd likely
be facing in this area, and also the sort of other 'fringe' benefits
(like a cool hobby) that I might derive from this in order to become
involved; for instance, if I purchase a bit of equipment, take my time
learning all of this stuff, and then build my project, what other sorts
of things can typically be done with this technology? What sort of
costs am I facing -- at a minimum -- especially if I have only a
soldering iron and a simple multimeter? What kind of learning curve
will I be facing? ... and will I need to learn the equivalent of what it
takes to earn an associate's degree, or perhaps just a single college
course? Is there a website or FAQ page that will start me out with a
good overview of this area of technology, explaining how the entire
process works?

Thank you for any help.

Bill Velek

 

[Franc Zabkar]

On Mon, 23 Aug 2004 14:24:33 -0500, Bill Velek
<billvelek--NO-SPAM--@alltel.net> put finger to keyboard and composed:

While in the process of trying to find a solution to a problem, I
received several suggestions that PIC or Basic-Stamps might be a
solution.

Consider PICAXE. These are preprogrammed PICs with on-chip BASIC. Over
here they cost about $3. You can program them via a PC COM port using
extremely basic hardware.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[CWatters]

"Bill Velek" <billvelek--NO-SPAM--@alltel.net> wrote in message
news:412A4471.3040001@alltel.net...

My impression is that these are simply chips that can be programmed
(perhaps something like an EPROM?),

The PIC family is a family of microprocessors with onchip memory. The most
interesting are those with FLASH memory that can be programmed with a home
made programmer connected to the serial port of a PC (very cheap). You can
program them in assembler (free) or a high level language (compilers at
various costs).

 

[Roger Gt]

"Rich Grise" wrote

<snip>
:
: Anybody want Red Hat Linux cheap?
: (I've got "Red Hat 9 Bible," "Beginning Red Hat 9" (the one they
pulled)
: and "Red Hat Linux for Dummies.")
:
: Free for picking up, Whittier, CA 90606.
: Cheers! Rich


Sure, But when I called your phone number it said disconnected.
On "Rivera Rd? " When would be convenient?

Roger Gt (I do use Red Hat.)

 

[Pat Deegan]

On Tue, 24 Aug 2004 07:31:03 +0000, CWatters wrote:

is any convenient way to measure how much electromagnetic radiation a
particular tree is picking up at a particular radio frequency.

I haven't look to see who wrote this article (or the quality of the science
behind the statements it contains)

I can't say that I've delved deeply into this site, but it gets pretty
fishy around chapter 11

http://www.leyman.demon.co.uk/11%20Earth%20Stress,%20Earthquakes,%20amd%20Earth%20Sensitives%20SAH11.html

"The reader will now need to put the desire for proof on hold. Trust has
to become a major element", etc.


However the referenced Wolfgang Volkrodt paper is available...
have a look at the links at the bottom of the
http://www.emrpolicy.org/science/forum/
page. The "Electromagnetic Pollution of the Environment" document seems to
conclude that otherwise clean forests (in Germany, Canada...) are being
adversly affected by military radar installations and radio links.

It's more a presentation for conference more than a scientific
paper but may give you some more leads.

HTH.

Regards,
--
Pat Deegan,
http://www.psychogenic.com/
Registered Linux User #128131

 

[Bill Velek]

Thank you all for your help, including Dave Platt, R.Hamlett, mike,
Jon-Erik Soderhelm, Franc Zabkar, C.Watters, and (from a different
group) "logized". I will now start reviewing the material, and
hopefully this will take care of me.

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

 

[Active8]

On Tue, 24 Aug 2004 16:43:50 -0500, Bill Velek wrote:

That's what happens when you change the subject line.

Er, suggestion. If you feel you *must* crosspost to so many groups,
set a followup header and make a note in the body for everyone to
try to followup to the most relevant group.

--
Best Regards,
Mike

 

[Watson A.Name - \"Watt Su]

"Roger Gt" <not@here.net> wrote in message
news:bdLWc.7653$QJ3.2374@newssvr21.news.prodigy.com...

"Rich Grise" wrote

snip
:
: Anybody want Red Hat Linux cheap?
: (I've got "Red Hat 9 Bible," "Beginning Red Hat 9" (the one they
pulled)
: and "Red Hat Linux for Dummies.")
:
: Free for picking up, Whittier, CA 90606.
: Cheers! Rich


Sure, But when I called your phone number it said disconnected.
On "Rivera Rd? " When would be convenient?

Roger Gt (I do use Red Hat.)

Maybe it's because I started that thread months ago(!)

 

[Rich Grise]

Roger Gt wrote:

"Rich Grise" wrote

snip
:
: Anybody want Red Hat Linux cheap?
: (I've got "Red Hat 9 Bible," "Beginning Red Hat 9" (the one they
pulled)
: and "Red Hat Linux for Dummies.")
:
: Free for picking up, Whittier, CA 90606.
: Cheers! Rich


Sure, But when I called your phone number it said disconnected.
On "Rivera Rd? " When would be convenient?

Roger Gt (I do use Red Hat.)

I wonder what phone no. I have that's disconnected? Yes, it's
Rivera Rd - I sit at ABI Engineering, area code five six two,
six nine six four eight four six. They only answer the phone
during office hours, though. Just ask for "Rich." That's the
company phone - the only phone I have in my name is the DSL
line, and I wouldn't answer that on a voice call anyway. Oh,
well.

Cheers!
Rich

 

[Andrew Tweddle]

Vinod Koul wrote:

Hi,
I tried to calculate the CPW parametrs using the formulation given
in RAINEE SIMONS: coplanar waveguide circuits, components and systems,
wiley interscience. this is the only place which deals with synthesis
of CPW. but has errors, i checked with the orignal ref and made
corrections. well getting to point, there two sets of formulae are
given 1st calclates slot width given all other things, and second
central conductor width.
But both these sets are not consistent with each other, like i tried
to simulate both equations in MATLAB, and answers in both were not
consistent with each other. For eg i calc, S= 272Micrometer for er=13,
Z=50, w=100u, h=100u, now for second set, its giving w = 18u, for the
same data as abive (s= 272u)!!!!
can anyone help me out
Try using Appcad from Agilent

www.hp.woodshot.com/

and failing that hand calculate the equation from first principles.
It is a simple Div/Grad/Curl equation.

Andrew

 

[Allan Adler]

Thanks for the suggestions on how radio waves might affect trees, but
that wasn't really the point of my posting, only my original motivation.
The point was to find out how to measure how much electromagnetic radiation a
particular tree is picking up at a particular radio frequency.

For example, do you drive a nail into the tree and connect the nail via
a wire to your pocket radio? Or do you use a dish to first measure how
much radiation of that frequency there is in some other direction with
no obstacles in it, then see how much comes from the direction of the
tree, compute how much of the latter is due to reflection off the tree
and then subtract from the first measurement to estimate how much is
being absorbed?
--
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.