Re: hacking

pigeon snake

Find some hacking guide also tools on
astalavista.box.sk

--- ServoKamen <kamen-san@...> wrote: >

Show quoted text

  ----- Original Message ----- 
  From: Jim Purcell 
  To: Electronics_101@... 
  Sent: Saturday, October 27, 2001 10:53 PM
  Subject: Re: [Electronics_101] hacking

  ejazabidi,

  > i need to know about "HACKING AND HOW TO HACK".
  > is there some one how help me.

  If you don't know how to hack, you probably don't
want to do it. If you are
  talking about breaking into computer systems and
the like. The term 'hacker'
  actually has no connection with the hacking you
are probably talking about.
  It's just that some hackers, i.e. people who like
to play around with
  computers also do the nasty kind of hacking. If I
knew how to do it I would
  never tell anyone.

  Jim

  Ditto that.

  ServoKamen.
  "Cruise Missile knockin' at your door."

  FUNNY!!

Re: replacement of IC THAT2155

Jonathan Luthje

#841

Without looking at any reference material, I would say that part number and
package looks remarkably similar to the audio amplifier IC's made by
Phillips Semiconductors.

Show quoted text

----- Original Message -----
From: <dharabi@...>
To: <Electronics_101@...>
Sent: Monday, October 29, 2001 11:31 AM
Subject: [Electronics_101] replacement of IC THAT2155

Can somebody help me by telling me any replacement of above. THAT2155
is a SIL package 7 pins used in audio circuit. thanks

Riaz Ahmed

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Re: newbie inquiry

Jonathan Luthje

#839

Mounir,
    Yes stun guns produce many thousands of volts - an automotive ignition
system can produce 75-100kV - a LOT of voltage. The primary reason that high
voltages (such as 110v or 240v as used in your house wiring) do kill is
because of the current path. The heart is the most susceptable organ in the
body to electrical impulses and the disruption of the same.

Thousands of volts can safely flow (though not without pain) through, say
your middle and index fingers without doing a lot of damage.

Don't get me wrong here - given enough current flow and voltage - it could
easily remove a hand or a couple of fingers - lower currents such as those
produced by an ignition system do not have sufficient amperage to cause
severe burns - although they can "spot burn" the skin - not enough to
notice.

As I was saying earlier - the primary cause of death due to electrocution is
heart failure as a result of current flowing through the heart - 0.0001
amperes is enough to stop the heart - but in the case of a stun gun the
current flows between the two electrodes, and so doesn't get to travel to
the heart. This is the reason for the old rule when it comes to working with
high voltages - keep one hand in your pocket and ensure that you have rubber
soled (insulated) shoes on. In this way the chance is highly reduced that a
high voltage will flow from one arm to the other (and hence through your
heart), or to ground (earth) through your legs, and again this gives a
higher probablity of the current flowing through your heart.

High frequency electricity also behaves quite differently to lower frequency
electricity (say 20kHz compared to 50Hz or 0Hz (DC)) - higher frequency
electricity tends to stick to the outside of your body (and such has been
demonstrated many a time by the maniacs (no offence anyone :-) that operate
Tesla coils having many millions of volts potential and sticking their hand
on the output dome or toroid - the electricity flows over the outside of
their body.

Not that I would ever attempt such a stunt myself ...

Hope this enlightens you a little


Regards,


J0n

replacement of IC THAT2155

[email protected]

#840

Can somebody help me by telling me any replacement of above. THAT2155 
is a SIL package 7 pins used in audio circuit. thanks

Riaz Ahmed

Re: newbie inquiry

Jim Purcell

#838

Mounir,

Doen't stun guns produce about 5000 volt? That at least doesn't
kill a person.Voltage doesn't kill or even hurt anyone. I once had an electronics teacher
in high school who said he had to wet his fingers to feel the 120 V power
line. Of course he was kidding, but he was old and his skin was dry and his
resistance was high. What 'hurts' is power, and probably energy.  Power is
voltage times current. The high voltage section of a TV set delivers about
30,000 volts, but the power supplies in those set are not designed to deliver
enough current to kill someone. I suppose it's not impossible but would
depend on the health of the person, etc. Those power supplies are also
designed to shut down when the load draws more current than it's supposed to,
i.e. when a person is getting zapped. Of course one would still feel that
power briefly. I used to tell me students that if they touch the high voltage
lead on a TV set they would probably cut themselves. That's because there are
some sharp corners inside the set we were working on. Here's the math:

The average person has several thousand ohms of resistance between those
critical two points on the body, the hands. (It's critical because death
results from current to the heart, usually AC).  If the shocking voltage is
the 120 V. power line one could draw 120 milliamperes or more in that case.
It takes about 1 mA for you to feel it and more to kill you. I have a chart
that gives the correct figures. We took a student and increase the voltage we
had applied to him while measuring the current and when he yelled we figured
he had felt it. When he died we knew what amount of current it took to kill
him...  Gotcha!!!

So it takes power, and probably energy, i.e. power times time to do work and
certainly to kill someone. Those defibrillators you see on the medical shows
operate in the thousands of volts, but their force is measured in Joules,
i.e. Watt Seconds.

Jim

Re: newbie inquiry

Mounir Shita

#837

Doesn't stunt guns produce about 5000 volt? That at least doesn't 
kill a person.

Mounir



--- In Electronics_101@y..., Jim Purcell <jpurcell@w...> wrote:
angteng,

Do you know which part of the electricity kills a man, is it the wattage,
voltage or current? Will 3,000 volts kill a man?As someone mentioned during the fuze debate, it is probably none of the above.
It is energy. I suspect a man could withstand 3 kV and the resulting current,
which is deponent on his skin resistance and body chemistry, for at least a few
milliseconds. Beyond that it's any body's guess. I had a student whose little
son got into the power company's electrical box one day and took many thousands
of volts. He lost an arm and I forget what all else. He is alive today and
plays sports and wonders what all the fuss is over his remarkable escape from
death.

Jim

Re: newbie inquiry

Jim Purcell

#836

angteng,

Do you know which part of the electricity kills a man, is it the wattage,
voltage or current? Will 3,000 volts kill a man?As someone mentioned during the fuze debate, it is probably none of the above.
It is energy. I suspect a man could withstand 3 kV and the resulting current,
which is deponent on his skin resistance and body chemistry, for at least a few
milliseconds. Beyond that it's any body's guess. I had a student whose little
son got into the power company's electrical box one day and took many thousands
of volts. He lost an arm and I forget what all else. He is alive today and
plays sports and wonders what all the fuss is over his remarkable escape from
death.

Jim

Re: Fw: communication concepts ??

Jim Purcell

#835

angteng,

Show quoted text

Sound is nothing more than compressions and decompressions of air.? Look at a speaker and?
?it is a serious mistake to use the above "speaker example" to illustrate how sound waves travelled because the above eg. has nothing to do with sound waves,
What is that comming from the speaker, prop wash. Of course it's sound. The pebble in the water example is used because it is very
visible. Sometimes speakers emit low frequency sound and that can
be seen AND heard.
it simply decode the the signal from the microphone
It's not so much a? decoding, although if you used that
concept the microphone encodes the sound and the speaker
decodes the signal back into sound. However, microphones
and speakers are transducers, they convert sound, i.e.
acoustics, to electrical voltage so that the input circuit can
amplify it. The speaker then converts the amplified elecrical
signal back into acoustic sound.
?I personally think that electro-magnetism is a force, therefore electromagnetic waves = electromagnetic force. and force can travel thru vacumn, thats how our rockets flies to the moon.
What is a force. There are lots of them, electrical force, electromotive
force, gravity, magnetic force.? Waves do not consist of particles traveling through space, but of changes in the medium which in such a
way that it seems like particles are traveling. Of course that seem to
break down when we get to a vacuum because em waves will travel in a
vacuum. There is a great dialog among physists about waves vs. particle
motion. I don't pretend to understand it at their level, I just know it
because of an interesting PBS special a few years ago.
Jim

(No subject)

Paul Allen Jordan

#832

Hi my name is Paul Jordan I live in Moberly Missouri.  I am going to college to get a degree in Industrial Electronics.

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Re: newbie inquiry

Jim Purcell

#833

angtengchat,

you may have
difficulties understanding what they are talking about if your knowledge is
limited eg,Then the name of the list should be changed, 101 implies the first electronics
course. No pre-reqs. It's true that some of the recent conversations have been
a bit advanced, but there have also been many messages that are elementary in
nature. The way I handle something like this is just 'hover' for awhile and see
if I can make out what's being said.

Jim

Re: Fw: communication concepts ??

angtengchat

#831

开云体育

----- Original Message -----

From: Shaun R. Phelps

To: Electronics_101@...

Sent: Sunday, October 28, 2001 1:25 PM

Subject: Re: [Electronics_101] Fw: communication concepts ??

Here is a high-level explantion:

?

Sound is nothing more than compressions and decompressions of air.? Look at a speaker and?think of the way if pulsates back and forth.? This is producing these compressions and decompressions.? Since there is nothing to compress in a vacuum, sound cannot travel through it.

?

Although I could visualise how sound waves propagate, just like dropping a 10cent coin into a pool of water, it is a serious mistake to use the above "speaker example" to illustrate how sound waves travelled because the above eg. has nothing to do with sound waves, it simply decode the the signal from the microphone (input), then subsequently encode it back to the speaker. This has nothing to do with sound except electro-magnetic waves.

?

Electromagnetic waves are different.? These are not compressions and decompressions (of air at least).? In fact, no-one truly knows who the electromagnetic waves really work.? They can travel through a vacuum at the speed of light (3 * 10^ 8 m/s).?

?

I personally think that electro-magnetism is a force, therefore electromagnetic waves = electromagnetic force. and force can travel thru vacumn, thats how our rockets flies to the moon.

?

Re: ASCII and Modbus

Jim Purcell

#829

iman,

Unfortunetly the
controller use ASCII protocol to comunicate.
Another question, How many bits a register in ASCII,is
ASCII have stop bit,parity bit as MODBUS has ?First off, stop bits have to do with seriel communication
and as far as I know have nothing to do with the code.
ASCII is a seven bit code in some systems, the extra
bit is used for error detection, in others that bit
allows for ANSI characters. Look at a good computer
book and it will show those characters, in decimal they
begin at 128.

Jim

Re: newbie inquiry

angtengchat

#830

Show quoted text

----- Original Message -----
From: <tedmv@...>

Hi!
 i'm interested in electronics, but i only know basic stuff, didn't
actually learn it in school. would it be alright if someone like me,
who has to be coached even on basic terminology, to join this group?As for me, it is ok for you to join this group, however, you may have
difficulties understanding what they are talking about if your knowledge is
limited eg, have you heard of the word lamda? Do you know which part of the
electricity kills a man, is it the wattage, voltage or current? Will 3,000
volts kill a man?

i'm asking because i don't want to offend anyone who is already
advanced by asking very basic question. all i'm asking for is a bit
of patience for my level of understanding. thanks.I believe most of us are patient, we are here to share and learn.

Welcome on-board!



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Re: Digest Number 135

J. Pinkston

#844

Not that I'm saying people should try to learn to hack but.... the part
about hackers not giving up there secrets isn't necessarily true. There's an
electronic book available for free D&#92;L called "The Great Hacker Crackdown"
which is a true account of what happened when AT&T's long distance went down
& they thought hackers had done it. But the part that was interesting is how
hackers hacked into the local phone system to get free long distance. No one
would have ever caught them except for the fact that they just couldn't keep
it to themselves. After word spread about how it was done, someone thought
it would be really funny to reprogram the phone computer so that when people
tried to call the local police they got a phone sex place instead. That's
when the it all hit the fan. The author said that most hackers just have to
brag to someone or it isn't worth the trouble to hack into a system. D/L the
book, it's a cool story.

Jim

Show quoted text

________________________________________________________________________

Message: 2
   Date: Sun, 28 Oct 2001 04:31:49 -0000
   From: monty73741@...
Subject: Re: hacking

first of all hacking is illegal
and with the digital milenium copy right act you can get in alot of
touble....plus hackers just dont give up there secrets....if you want
to learn how to hace start studing programing and systems including
there architecture
jason

Re: Digest Number 134

J. Pinkston

#843

Correct me if I'm wrong, but didn't Ben Franklin, when he was doing his
experiments with electricity, put to plates close together hooked up to his
static generator, & charge them? That part I'm pretty sure is true. But it
seems like he then could take one of the plates away for a while & when he
put it closely back together he could then discharge it. If that's true, how
could the charge be stored in the air separating the two, especially when
the air was circulating, which I'm sure it was? Maybe it was because it was
a static charge, like we get in the winter from walking on carpet. I guess
I'll have to look back at his experiments.

Jim

Show quoted text

________________________________________________________________________

Message: 9
   Date: Sat, 27 Oct 2001 17:47:10 -0500
   From: Jim Purcell <jpurcell@...>
Subject: Re: Re: Fuses vs. resistors

Guillermo,

it's stored in vacuum capacitors.That's a good one! I would be very grateful if you tell me theHave to get it from someone besides me. I'm neither a physicist,
nor an engineer, although I challenge an engineer to explain it. :-)

Jim

Re: Automation

iman hermansyah

#828

Hi Iask,

I'm interesting in Automation too especially in
industrial intsrumentation and Automation,i work for
one of oil company at Instrument division.

iman

--- iasknoone@... wrote:
I work as a Technical Support Engineer in Automation
Division of a 
Turkish Company, Ozdisan Electronics....I would like
to discuss about 
any kind of Automation and Electronics.

If you have any special projects about Automation we
may share it.




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Re: ASCII and Modbus

iman hermansyah

#827

Jim & Anand,

I'm getting more clearly about this,
Anand u're right this modbus i'll use for
communication a DCS ( Distributed Control System) and
a controller.This DCS is one of ABB product and the
controller is a product of Altronic.Unfortunetly the
controller use ASCII protocol to comunicate.
Another question,How many bits a register in ASCII,is
ASCII have stop bit,parity bit as MODBUS has ?

I'm so sorry if my question looks so sily,frankly i'm
really a beginner in this matter.

Thank's,
iman
--- Jim Purcell <jpurcell@...> wrote:
anand,

I hope that I have clarified your point.
So it sounds like there is no conversion between
ASCII
and Modbus, it's apples and oranges time.

Jim


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Re: Hello!

Jim Purcell

#826

greg,

New here. Just saying hello, and hoping this might be a place to
learn.Yep.

Jim

Hello!

[email protected]

#825

New here. Just saying hello, and hoping this might be a place to 
learn.

Re: Robots

Mounir Shita

#823

hmmm....yeah, Lego Mindstorm or something. Just came from my soccer 
game, gonna jump in the shower (get rid of some of the smell you 
accumulate on the field *s*) and stop by Toys'r'us and check out the 
Lego stuff.

Mounir


--- In Electronics_101@y..., "d nixon" <dnixon9@h...> wrote:
Hmmm...Does the Lego robot development system use a PIC?  I'm not sure.

-Mike


From: "Mounir Shita" <mshita@c...>
Reply-To: Electronics_101@y...
To: Electronics_101@y...
Subject: [Electronics_101] Robots
Date: Sun, 28 Oct 2001 18:41:10 -0000

Anyone know where I can find a "PIC" powered little toy robot of some
kind? Toy store or something?

-Mounir

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