Post-Text Exercises

IV. Find the word with the similar meaning according to the idea of text 6a.

1. a mplifier intensifier; forcer; promoter; reducer

2. t o conduct to pass; to build; to carry out; to lead

3. configuration device; system; form; equipment

4. extent tension; degree; step; state

5. potential voltage; effort; combustion; power

6. apparent obvious; normal; industrial; accurate

7. solution conclusion; appearance; answer; way out

8. to operate to go; to act; to require; to reverse

9. gain wave; effort; resource; amplification

10. arrangement transformed; unlimited; organized; reinforced

V. Complete the following. Use the words in the box to help you.

pick up, cartridge, transistor, pre-amplifier, operating point, power amplifier

Components of an amplifier system	Function
…………………………	produces an electric signal
…………………………	amplifies the small signal from the cartridge
…………………………	fulfils the high-power amplification
…………………………	rectifies the input signal
…………………………	ensures the change of the temperature

VI. Read and translate word combinations consisting of two or more components. See model. Read and translate the sentences from the text containing these word combinations.

Model: energy usage – использование энергии

power amplifier, transistor action, high-power amplifier, high-power amplification, fault conditions, characteristic curve

VII. Answer the following questions:

1. What does the amplifier consist of?

2. What parts of the signal cause the transistor to conduct?

3. What are the functions of its parts?

4. What makes the input signal sound terrible? What is the solution to this problem?

5. Why is it impossible to specify the gain of a transistor very accurately?

6. What is needed for compensation for variations in gain of the transistor?

7. How do resistors work?

8. What does the term ‘feedback’ mean?

9. What feedback is used in this case? Why is it used here?

VIII. Match the English words in column a to their Russian equivalents in column b:

A	B
pick-up cartridge speaker preamplifier terminal forward-biased rectify linear base-emitter excursion leakage ambient feedback counteract network drive	протекание, течь контур обратной связи привод, передача звукосниматель, датчик зажим, клемма схема, цепь излучатель громкоговоритель выпрямлять линейный уравновешивать, нейтрализовать сдвиг, полюс окружающий предварительный усилитель смещенный в прямом направлении

IX. Below are some figures you know from your science classes. In groups, look at them carefully and match figures with their descriptions.

Figure 1	A. Open-loop test circuit. For this circuit the connections are labeled according to pin numbering conventions. Remember this for all subsequent circuits. To find the pin allocations for other chips that you might use, the company data sheets must be consulted!
Figure 2	B. Non-inverting amplifier
Figure 3	C. An op-amp as a follower
Figure 4	D. An alternative current to voltage converter
Figure 5	E. Summing Amplifier
Figure 6	F. Inverting amplifier. The power connections are now implied.
Figure 6a	G. Integrator circuit
Figure 7	H. How the DIP goes into the breadboard
Figure 8	I. Current to voltage converter

X. Now that the functions of the main components of an amplifier are formed try to develop the basic concept of the device: a smaller current is used to modify a large current. Work in pairs to exchange your ideas.