My speciality. Овчинникова Т.Е - 21 стр.

      2.6.3 Find Russian equivalents to the English words

handle v                   упрощать
assumption n               помнить
statement n                управлять
remove v                  тот же самый
validity n                 разумный
reverse v                 допущение
sign n                    несколько
simplify v                 утверждение
remember v                 обоснованность
feedback n                 устранять
reasonable а               обратная связь
some pron                 знак
(the) same а              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. 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 Ec and Еь are opposite in phase. This fact can also
be noted in Figure 8, and it becomes an important consideration in amplifiers
employing feedback.




Figure 9-Equvalent Circuit Corresponding to Fig.7.