2.6 Part 6

1. Remember the pronunciation of the following words

equivalent, actual, reasonable, assumption, quantity, straight, parallel, equally, va­lidity, examine, reverse.

2. Read the words, pay attention to stress shift

B-supply voltage and the load resistance, but also on the tube characteristics themselves. This line is known as the dynamic mutual characteristics of a tube.

Notes to the text

load line-нагрузочная характеристика in question — зд. о которой идет речь П

Figure 8-The Load Line

simplify — simplification; consider—consideration.

2.6.3 Find Russian equivalents to the English words

упрощать помнить управлять тот же самый разумный допущение несколько утверждение обоснованность устранять обратная связь знак

изменять направление

2.6.4 Find the sentence with the infinitive construction. Find the construction and translate into Russian (paragraph 2); Find the predicate with the related model verb (paragraph 2)

THE EQUIVALENT CIRCUIT

1. Another method of finding the A.C. output of a triode or other tube is by means of the equivalent crircuit. This is shown in Figure 9, and corresponds to the actual circuit of Figure 7. With certain reasonable assumptions, it may be shown the equivalent circuit leads to the same values of current and voltage in the load resistor R as the A.C. components of these quantities in the actual circuit.

2. The assumptions required are that the curves of the tube characteristics be straight, parallel, and equally spaced. These statements may always be considered to hold for very small signals, but when a large swing is to be handled their validity should be examined in each case.

3. The voltage amplification of the circuit of Figure 7 is defined as the ratio of the A.C. plate voltage to the applied signal voltage on the grid. This voltage amplification will now be computed by use of the equivalent circuit.

4. handle v assumption n statement n remove v validity n reverse v sign n simplify v remember v feedback n reasonable a some pron (the) same a

   If the direction of current flow is reversed to agree with that flowing in the actual tube, the negative sign is removed from the numerator; this is commonly done to simplify the writing.

5. It should be remembered that E_c and Eb are opposite in phase. This fact can also be noted in Figure 8, and it becomes an important consideration in amplifiers employing feedback.

и

©6 ГИ

Figure 9-Equvalent Circuit Corresponding to Fig.7.

2.6.5 Translate the word-combinations

1. voltage amplification, voltage drop.

2. another method of finding the A.C. output of a triode is by means of.... The curves of the tube characteristics must be straight, parallel, and equally spaced. This is commonly done to simplify the writing.

6. Answer the questions

1. What does Fig. 9 show? 2. What are the required assumptions for the curves? 3. By what will the voltage amplification be computed?

6. Identify parts of speech. Underline suffixes, translate into Russian

assumption, reasonable, commonly, simplify, statement, respectively, validity, transmission.