Unit 13

Task 1. Study new words and word combinations

1	AF=audio frequency	['ɔːdɪəu]	звуковая частота, низкая частота
2	silicon chip		кремниевый чип
3	aerial	['ɛərɪəl]	антенна
4	tuner	['tjuːnə]	тюнер, приемник
5	speaker		динамик
6	supply rail	[sə'plaɪ]	шина питания, питающая шина
7	approach	[ə'prəuʧ]	подход, принцип
8	wiper	['waɪpə]	ползунок, скользящий контакт
9	block/circuit diagram		блок-схема / электроцепь
10	complicated		сложный, трудный, запутанный
11	feed (fed-fed)		питать, подавать энергию
12	consist of		состоять из
13	comprise		включать
14	bridge	[brɪʤ]	соединять
15	earth	[ɜːθ]	заземлять
16	in series		последовательно
17	in parallel		параллельно
18	modulator		регулятор, модулятор синхронизатора, преобразователь

Task 2 .Match the pairs of synonyms.

1) value	a) complex, composite
2) complicated	b) to include
3) variable	c) to compose
4) to bridge	d) meaning, magnitude
5) to consist of	e) to link, to connect
6) to comprise	f) alternative, alternating

Task 3. Complete the table with the related words and memorize them.

Noun	Verb	Adjective
value
		variable
	to tune
speaker
wiper
		complicated
	to frequent
modulator

Task 4. Use the word in brackets to form a word which fits in the sentence.

1. Using this approach we’ll get … results (to value). 2. The a) … b)… a carrier wave (to modulate). 3. A … capacitor can vary between 5 and 65 picofarads (to vary). 4. AF stands for audio …. (to frequent). 5. The … selects the required signal (to tune).

Task 5. Read the text and answers the questions.

ELECTRONIC DIAGRAMS

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 in Figure 1.

To understand how the radio works, it is important to understand the function of each unit than to know what components are used. This is known as a systems approach to electronics. For example, in Fig. 1 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 connections and values of the components inside these basic units can be shown in a circuit diagram using standard electronic symbols. Fig.2 shows the circuit diagram for the simple radio.

1. What do we call the two types of diagrams shown in the text? 2. What do we call the approach to electronics which focuses on the function of units?

Task 6. How many of the circuit symbols in Fig.2 can you identify? Use Appendix 1 to help you.

Task 7. Here are some circuit symbols. Label them and describe their function. For example:

3h It’s called a transformer. It steps AC voltages up or down.

This list of functions may help you.

1. vary capacitance in a circuit

2. rectify alternating current

3. add resistance to a circuit

4. measure very small currents

5. break a circuit

6. protect a circuit

7. vary the current in a circuit

8. step AC voltages up or down.

9. receive RF signals

10. measure voltages

TASK 8. Study this block diagrams and circuits. Look again at Fig.1 above. We can describe it like this:

The radio consists of a tuner, a detector, and an AF amplifier.