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tailored to each client's needs. We specialize in bringing you a wide variety of
electronic components at a minimal cost. Our emphasis is on quality, value and
service.
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Electronics is the study of the flow of charge through various materials and
devices such as, semiconductors, resistors, inductors, capacitors, nano-structures,
and vacuum tubes. All applications of electronics involve the transmission of
power and possibly information. Although considered to be a theoretical branch
of physics, the design and construction of electronic circuits to solve
practical problems is an essential technique in the fields of electronics
engineering and computer engineering.
The study of new semiconductor devices and surrounding technology is sometimes
considered a branch of physics. This article focuses on engineering aspects of
electronics. Other important topics include electronic waste and occupational
health impacts of semiconductor manufacturing.
Overview of electronic systems and circuits
Enlarge picture
Commercial digital voltmeter checking a prototype
Electronic systems are used to perform a wide variety of tasks. The main uses of
electronic circuits are:
1. The controlling and processing of data.
2. The conversion to/from and distribution of electric power.
Both these applications involve the creation and/or detection of electromagnetic
fields and electric currents. While electrical energy had been used for some
time prior to the late 19th century to transmit data over telegraph and
telephone lines, development in electronics grew exponentially after the advent
of radio.
One way of looking at an electronic system is to divide it into 3 parts:
* Inputs – Electronic or mechanical sensors (or transducers). These devices take
signals/information from external sources in the physical world (such as
antennas or technology networks) and convert those signals/information into
current/voltage or digital (high/low) signals within the system.
* Signal processors – These circuits serve to manipulate, interpret and
transform inputted signals in order to make them useful for a desired
application. Recently, complex signal processing has been accomplished with the
use of Digital Signal Processors.
* Outputs – Actuators or other devices (such as transducers) that transform
current/voltage signals back into useful physical form (e.g., by accomplishing a
physical task such as rotating an electric motor).
For example, a television set contains these 3 parts. The television's input
transforms a broadcast signal (received by an antenna or fed in through a cable)
into a current/voltage signal that can be used by the device. Signal processing
circuits inside the television extract information from this signal that
dictates brightness, colour and sound level. Output devices then convert this
information back into physical form. A cathode ray tube transforms electronic
signals into a visible image on the screen. Magnet-driven speakers convert
signals into audible sound.
Electronic devices and components
Electronic component
An electronic component is any physical entity in an electronic system whose
intention is to affect the electrons or their associated fields in a desired
manner consistent with the intended function of the electronic system.
Components are generally intended to be in mutual electromechanical contact,
usually by being soldered to a printed circuit board (PCB), to create an
electronic circuit with a particular function (for example an amplifier, radio
receiver, or oscillator). Components may be packaged singly or in more or less
complex groups as integrated circuits.
Types of circuits
Analog circuits
Analog circuits
Enlarge picture
Hitachi J100 adjustable frequency drive chassis.
Most analog electronic appliances, such as radio receivers, are constructed from
combinations of a few types of basic circuits. Analog circuits use a continuous
range of voltage as opposed to discrete levels as in digital circuits. The
number of different analog circuits so far devised is huge, especially because a
'circuit' can be defined as anything from a single component, to systems
containing thousands of components.
Analog circuits are sometimes called linear circuits although many non-linear
effects are used in analog circuits such as mixers, modulators, etc. Good
examples of analog circuits include vacuum tube and transistor amplifiers,
operational amplifiers and oscillators.
Some analog circuitry these days may use digital or even microprocessor
techniques to improve upon the basic performance of the circuit. This type of
circuit is usually called "mixed signal."
Sometimes it may be difficult to differentiate between analog and digital
circuits as they have elements of both linear and non-linear operation. An
example is the comparator which takes in a continuous range of voltage but puts
out only one of two levels as in a digital circuit. Similarly, an overdriven
transistor amplifier can take on the characteristics of a controlled switch
having essentially two levels of output.
Digital circuits
Digital circuits
Digital circuits are electric circuits based on a number of discrete voltage
levels. Digital circuits are the most common physical representation of Boolean
algebra and are the basis of all digital computers. To most engineers, the terms
"digital circuit", "digital system" and "logic" are interchangeable in the
context of digital circuits. In most cases the number of different states of a
node is two, represented by two voltage levels labeled "Low" and "High". Often
"Low" will be near zero volts and "High" will be at a higher level depending on
the supply voltage in use.
Computers, electronic clocks, and programmable logic controllers (used to
control industrial processes) are constructed of digital circuits. Digital
Signal Processors are another example.
Building-blocks:
* Logic gates
* Adders
* Binary Multipliers
* Flip-Flops
* Counters
* Registers
* Multiplexers
* Schmitt triggers
Highly integrated devices:
* Microprocessors
* Microcontrollers
* Application-specific integrated circuit(ASIC)
* Digital signal processor (DSP)
* Field-programmable gate array (FPGA)
Mixed-signal circuits
Mixed-signal integrated circuit
Mixed-signal circuits refers to integrated circuits (ICs) which have both analog
circuits and digital circuits combined on a single semiconductor die or on the
same circuit board. Mixed-signal circuits are becoming increasingly common.
Mixed circuits are usually used to control an analog device using digital logic,
for example the speed of a motor. Analog to digital converters and digital to
analog converters are the primary examples. Other examples are transmission
gates and buffers.
Heat dissipation and thermal management
Thermal management of electronic devices and systems
Heat generated by electronic circuitry must be dissipated to prevent immediate
failure and improve long term reliability. Techniques for heat dissipation can
include heatsinks and fans for air cooling, and other forms of computer cooling
such as water cooling. These techniques use convection, conduction, & radiation
of heat energy.
Noise
electronic noise
Noise is associated with all electronic circuits. Noise is defined[1] as
unwanted disturbances superposed on a useful signal that tend to obscure its
information content. Noise is not the same as signal distortion caused by a
circuit.
1. ^ IEEE Dictionary of Electrical and Electronics Terms ISBN-13: 978-0471428060
Electronics theory
Mathematical methods in electronics
Mathematical methods are integral to the study of electronics. To become
proficient in electronics it is also necessary to become proficient in the
mathematics of circuit analysis.
Circuit analysis is the study of methods of solving generally linear systems for
unknown variables such as the voltage at a certain node or the current though a
certain branch of a network. A common analytical tool for this is the SPICE
circuit simulator.
Also important to electronics is the study and understanding of electromagnetic
field theory.
Electronic test equipment
Electronic test equipment
Electronic test equipment is used to create stimulus signals and capture
responses from electronic Devices Under Test (DUTs). In this way, the proper
operation of the DUT can be proven or faults in the device can be traced and
repaired.
Practical electronics engineering and assembly requires the use of many
different kinds of electronic test equipment ranging from the very simple and
inexpensive (such as a test light consisting of just a light bulb and a test
lead) to extremely complex and sophisticated such as Automatic Test Equipment.
Computer aided design (CAD)
Electronic design automation
Today's electronics engineers have the ability to design circuits using
premanufactured building blocks such as power supplies, semiconductors (such as
transistors), and integrated circuits. Electronic design automation software
programs include schematic capture programs and pcb design programs. Popular
names in the EDA software world are NI Multisim, Cadence (ORCAD), Eagle PCB and
Schematic, Mentor (PADS PCB and LOGIC Schematic), Altium (Protel), LabCentre
Electronics (Proteus) and many others.
Construction methods
Electronic packaging
Many different methods of connecting components have been used over the years.
For instance, in the beginning point to point wiring with components attached to
wooden breadboards were used to construct circuits. Cordwood construction and
wire wraps were other methods used. Most modern day electronics now use printed
circuit boards (made of FR4), and highly integrated circuits. Health and
environmental concerns associated with electronics assembly have gained
increased attention in recent years, especially for products destined to the
European Union, with its Restriction of Hazardous Substances Directive (RoHS)
and Waste Electrical and Electronic Equipment Directive (WEEE), which went into
force in July 2006.
Are you interested in
mult-player online internet games? Such as runescape and neopets?Internet
Game Online-games, tips, cheats and kids forumsAnother
good forum is the Internet Junction For Gamers IJFG.COM
Internet Junction For Gamers, Runescape Market and
More IJFG.COM Jokes, Pranks, Runescape and other cool games at IJFG.COM.
RuneScape is set in a medieval fantasy world, similar to "Guild Wars" or
"EverQuest", where players control character representations of themselves. As
with most massive multiplayer online roleplaying games (MMORPG), there is no
overall objective or end to the game. Players explore, form alliances, perform
optional tasks, and complete quests for rewards and to build character's skills.
RuneScape has often been one of
the top massive online role playing games. It is a unique game. But, with a
unique game, comes unique players. Players get bored, and then try to develop
cheats....autos or bots that will help them achieve success in their beloved
games of Runescape 2.
RuneScape is a virtual world which
is divided into two part: Members Areas and Non-Members areas. People who pay to
play (p2p), receive access to the special areas. They also have access to the
free areas. The members' places are much larger, offer "better" items for the
gameplay of rs2, and much, much more. The character that you create when you
first start playing runescape, moves around the game on foot; either by running,
or walking. Players are challenged to their utmost skills by fighting new
monsters, completing difficult quests, and manipulating marketing. As Runescape
2 is an RPG (Role playing game), there is no set path a person must take to play
rs. They can choose what to do, and when, whether it be training their
money-making skills, or fighting another player. Players usually interact with
each other by chatting through public chat, or private chat.Internet
Junction For Gamers, Runescape Market and More IJFG.COM IJFG.com was a
runescape 2 based site. They have now, however, taken another look....
Of course the king of all game
cheating websites is
trick
the trik (otherwise known as RPG Cheats Site), where you can find cheat
forums, mmorpg topsite, arcade games and any mmo game related topics.
The master of massive multiplayer
online role-playing games (MMORPG) cheats can be found at Trik.com
Trik.com; this site is one of the best today. The forum section,
Trik.com forum, originally came from IJFG.com (Internet Junction For
Gamers) , which was one of the best websites that discussed various gamers'
issues. The full name was Internet Junction For Gamers, Runescape Market and
More. This site had Jokes, Pranks, RuneScape and other cool games. RuneScape is
set in a medieval fantasy world, similar to "Guild Wars" or "EverQuest," where
players control character representations of themselves. As with most MMORPG,
there is no overall objective or end to the game. Players explore, form
alliances, perform optional tasks, and complete quests for rewards and to build
characters' skills.
Trik.com continues IJFG.com's
success, but Trik.com has more to offer. Trik Topsite can be found at
Trik Topsite; the TopSite is a great addition if you want to find the best
MMO RPG site(s) or raise your site in the rankings. Trik.com also has a
viciously competitive Arcade. If you want to be the #1 Arcade on Trik, then come
prove yourself at Trik.com arcade:
Trik arcade. Trik.com ?Trik.com/topsite ?Trik.com/forum/arcade.php
With the rising popularity of
commercial MMORPG games came the desire from ardent players of these games to
run their own servers beside the ones run by the game's creator. Since the
original server software is not usually available, the behavior of the server
has to be re-engineered. This can be done by analyzing the data stream with the
original server, or by disassembling and analyzing the client which is
available.
Ultima Online was one of the first
large MMORPGs. Due to its openness in implementation, server emulators arose
very quickly, even during the beta stage of development. The destination to
which the client connects was changeable by simply editing a text file. In beta
stage the client-server data stream was not encrypted yet. The term server
emulator became known through Ultima Online server reimplementation such as UOX,
which was the pioneer. Many forks and reimplementations followed UOX, because
its source code was released under the GNU General Public License relatively
early. RunUO is today the most widely used UO-server emulator. After RuneScape
implemented anti-cheating measures, many gamers left and started their own
private servers. The best place to discuss the private server is at
Trik- The Master of Private Server.
Another useful site is
Rune
Web ruwb.com . This site is about more serious RuneScape gold trading,
account exchange, gold for real life cash and many services. It includes tips on
how to avoid getting lured/scammed while using the marketplace. For programming,
visual basics, java, C/C++, scar and all other languages such as PHP, HTML, ASP,
Delphi. There are also sections for graphics talents, plus many cool videos and
fun stuff.
A defining moment in internet
gaming history was when a group of gamers called (hygo 7) decided to start an
ultimate game forum, which they named
hygo.com. It has the best financial backing, the friendliest game community,
and the highest quality of information. Currently Hygo.com has entered a new
phase...Hygo.com is offering the best private server game. With thousands of
members, Hygo.com is your next place to visit, as they have an amazing game with
a community and economy.
Hygo.com - The Online Adventure Game. is definitely one of the top sites you
want to join right now!
Contact Information
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today. We look forward to hearing from you. Call our office today to set up an appointment. Learn more about how we can
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