Unit 4 text a Understanding electronic diagrams
1. Translate the words and phrases. Make up your own sentences with them.
Basic unit, block diagram, component, tuner, detector, amplifier, aerial.
2. Read and translate the following text:
Although electronic devices may look complicated, they are made up of common basic units (building blocks) connected together. The function of each of these units and the path of the signals between them can be shown in a block diagram. For example, the block diagram of a simple radio is shown below
a
tuner
detector
AF amp
volume control
power amp
speaker
To understand how the radio works, it is more important to understand the function of each unit than to know what components are used. This is known as a system approach to electronics. For example, in the picture the tuner selects the required signal, the detector then separates off the audio part of the signal, and the AF amplifier (amp) amplifies it.
The connection and values of the components inside these basic units can be shown in a circuit diagram using standard electronic symbols.
3. Match the words and their translations:
1. complicated a) посилювати
2. select b) підхід
3. approach c) складний
4. separate d) обирати
5. amplify e)розподіляти
6. value f) значення, величина
4. Name basic units of the block diagram of a simple radio.
5. Translate into English:
1. Всі електронні пристрої складаються з основних одиниць, які з’єднані в одну систему.
2. Щоб зрозуміти роботу цілого пристрою, потрібно знати функції кожного компонента.
3. Знання роботи кожної складової одиниці – є системний підхід в електроніці.
4. Антена приймає сигнали, тюнер обирає потрібний сигнал, детектор виділяє аудіо частину сигналу.
5. На мікросхемі показується з’єднання та значення компонентів використовуючи стандартні електронні символи.
TEXT B
1. Read and translate the text in a written form: Block Diagrams
Block diagrams are a method of explaining complex systems (not necessarily electronic) in a simple manner.
They are made up from labeled blocks which are joined by arrows. The arrows indicate the direction of flow, and inputs to and outputs from the blocks.
At this stage it is not necessary to know how the block does its job. That will come later with a greater understanding of electronics.
In the example the low level signals from the three microphones are mixed together by the MIXER which gives a mixed low level signal out. The mixed signal is applied to the POWER AMPLIFIER which provides a high level signal to drive the loudspeaker.
The POWER SUPPLY UNIT converts the ac mains supply voltage to a dc voltage suitable for the system.
Even with this limited knowledge we can apply a little logical fault finding.
A circuit diagram (also known as an electrical diagram, elementary diagram, or electronic schematic) is a simplified conventional pictorial representation of an electrical circuit. It shows the different components of the circuit as simplified standard symbols, and the power and signal connections between the devices. Arrangement of the components interconnections on the diagram does not correspond to their physical locations in the finished device.
Unlike a block diagram or layout diagram, a circuit diagram shows the actual wire connections being used. The diagram does not show the physical arrangement of components. A drawing meant to depict what the circuit actually looks like is called "artwork" or "layout".
Circuit diagrams are used for the design (circuit design), construction and maintenance of electrical and electronic equipment.
On a circuit diagram, the symbols for components are labelled with a descriptor (or reference designation) matching that on the list of parts.
2. Make up a plan of the text in the form of questions.
TEXT C
1. Mind the following words:
circuitry – схема, ланцюг
layout – схема розташування
audio amplifier system – система посилення звукового сигналу
2. Listen to the text “Electronic Diagram “and try to understand it.
3. Answer the following questions:
1. What are circuit diagrams?
2. Are they made of standard symbols?
3. What does “READING a circuit diagram” mean?
4. What components does audio amplifier system include?
5. What components are there in a receiver system?
UNIT 5
TEXT A
Component Values
1. Read and remember the words and word combinations:
Band-стрічка
digit-цифра
tolerance-похибка
value-значення
capacitor-конденсатор
semiconductor-напівпровідник
application-застосування
significance-важливість
voltage-напруга
2.Read and translate the texts:
If you've ever looked down on a city from a skyscraper window, you'll have marvelled at all the tiny little buildings beneath you and the streets linking them together in all sorts of intricate ways. Every building has a function and the streets, which allow people to travel from one part of a city to another or visit different buildings in turn, make all the buildings work together.
The circuits inside pieces of electronic equipment are a bit like cities too: they're packed with components (similar to buildings) that do different jobs and the components are linked together by cables or printed metal connections (similar to streets). Unlike in a city, electronic circuits are built up from a small number of standard components.
These are some of the most important components you'll encounter: resistors, diodes, capacitors