الكترونيات
من ويكيبيديا، الموسوعة الحرة
النص الموجود في هذه الصفحة هو في مرحلة الترجمة إلى اللغة العربية, إذا كنت تعرف اللغة المستعملة, لا تتردد في الترجمة , و شكرا.
قالب:Otheruses4
الالكترونيات هي مجال دراسة واستخدام الأنظمة التي تعمل عن طريق التحكم بجريان الإلكترونات ضمنها (أو حاملات الشحنة الأخرى) في بعض الأجهزة أمثلتها : صمام حراري أيونى و شبه الموصل. .وكذلك تصميم و بناء دارة الكترونيةلحل مشاكل عملية هو تقنية أساسية في مجال هندسة الالكترونيات و مساوٍ في الأهمية في تصميم العتاد الصلب في مجال هندسة الحاسوب. كل التطبيقات في الالكترونيات تتضمن إما نقل معلومات أو قدرة. ومعظمها يتعامل فقط مع معلومات.
إن دراسة أجزة أشباه الموصلات و التقنيات المشابهة يعتبر أحيانا فرع من الفيزياء. هذه المقالة تتمركز علي الأوجه الهندسية من الالكترونيات
فهرست |
[تحرير] نظرة عامة على الأنظمة والدارات الالكترونية
الأنظمة الالكترونية تستخدم لأداء مهام عديدة. أهم استخدامات الدارات الالكترونية هي:
1. التحكم في ومعالجة البيانات
2. التحويل من/إلى القدرة الكهربية
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.
[تحرير] الأجهزة و المكونات الالكترونية
An electronic component is any indivisible electronic building block packaged in a discrete form with two or more connecting leads or metallic pads. Components are intended to be connected together, usually by soldering to a printed circuit board, to create an electronic circuit with a particular function (for example an amplifier, radio receiver, or oscillator). Components may be packaged singly (resistor, capacitor, transistor, diode etc.) or in more or less complex groups as integrated circuits (operational amplifier, resistor array, logic gate etc). Active components are sometimes called devices rather than components.
[تحرير] أنواع الدارات
[تحرير] دارات تناظرية
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.
[تحرير] دارات رقمية
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.
وحدات البناء:
- logic gates
- Adders
- Binary Multipliers
- flip-flops
- counters
- registers
- multiplexers
- Schmitt triggers
أجهزة عالية التكامل:
- microprocessors
- microcontrollers
- Application specific integrated circuit(ASIC)
- Digital signal processor (DSP)
- Field Programmable Gate Array (FPGA)
[تحرير] دارات مختلطة الإشارة
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 contain both analog and digital components. Analog to digital converters and digital to analog converters are the primary examples. Other examples are transmission gates and buffers.
[تحرير] تشتت احرارة والإدارة الحرارية
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.
[تحرير] الضوضاء
Noise is associated with all electronic circuits. Noise is generally defined as any unwanted signal that is not present at the input of a circuit. Noise is not the same as signal distortion caused by a circuit.
[تحرير] نظرية الالكترونيات
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.
[تحرير] معدات اختبار الالكترونيات
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.
[تحرير] تصميم مُعَاوَن حاسوبيا (صعح)
Today's electronics engineers have the ability to design circuits using premanufactured building blocks such as power supplies, resistors, capacitors, semiconductors (such as transistors), and integrated circuits. Electronic design automation software programs include schematic capture programs such as ORCAD or Eagle Layout Editor, used to make circuit diagrams and printed circuit board layouts.
[تحرير] طرق البناء
Many different methods of connecting components have been used over the years. For instance, in the beginning point to point wiring using tag boards attached to chassis were used to connect various electrical innards. Cordwood construction and wire wraps were other methods used. Most modern day electronics now use printed circuit boards or highly integrated circuits.
[تحرير] صفحات فرعية
- Digital electronics
- Analogue electronics
- Microelectronics
- Fuzzy electronics
- Electronic Devices and Circuits
- Integrated circuit
- Optoelectronics
- Semiconductor
- Semiconductor device
[تحرير] انظر أيضا
- Circuit diagram
- Computer engineering
- Datasheet
- E-waste
- Electrical engineering
- IEEE - the Institute of Electrical and Electronics Engineers
- Mechatronics
- Signal theory
- Transducer
[تحرير] وصلات خارجية
قالب:كتبوييكي
- Electronics Components Tutorials for Robotics
- Navy 1998 Navy Electricity and Electronics Training Series (NEETS)
- DOE 1998 Electrical Science, Fundamentals Handbook, 4 vols.
- Electronics Infoline Directory of Electronics Projects.
- قالب:Dmoz
- قالب:Dmoz
- قالب:Dmoz
- قالب:Dmoz
- قالب:Dmoz
- قالب:Dmoz
- Electronics Manufacturers Directory
- Electronics related books and projects
- Lessons in Electric Circuits - A free series of textbooks on the subjects of electricity and electronics.
| أنماط التقنية |
الحقول الأساسية للتقنية |
تحرير |
|---|---|---|
| علوم تطبيقية | تخزين الطاقة | تقنيات الحوسبة | الكترونيات | الطاقة | تعدين | تقانة ميكروية | تقانة نانوية | تقانة نووية | |
| نشاط رياضي و إعادة إنتاج | معدات التخييم | Playground | رياضات | رياضية معدات | Sports memorabilia | |
| فنون و لغة | تقنيات التواصل | تقنيات الرسوميات | تقنيات موسيقية | تقنيات مرئية | |
| أعمال/معلومات | إنشاء | تقنية معلومات | تصنيع | آلات | تنقيب | إتصال عن بعد | |
| دفاع | قنابل | بنادق و حصانة | تقنيات ومعدات عسكرية | |
| منزليات | تطبيقات منزلية | تقنيات منزلية | تقنيات و منتجات الأطعمة | |
| هندسة تطبيقية | هندسة زراعية | هندسة حيوية | هندسة مدنية | هندسة كيميائية | هندسة كيميائية حيوية | هندسة كهربائية | هندسة ميكانيكية | هندسة نفطية | |
| صحة | هندسة حيوية طبية | تقانة حيوية | تقنيات صحة | علم الأدوية | |
| سفر و تجارة | طيران | هندسة طيران | مركبات آلية | تقنيات فضائية | نقل | |
