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Unit Twenty [20]

1. A) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

to feed (fed)

питать

to include

[ɪnˈkluːd]

содержать, заключать (в себе)

to remain

[rɪˈmeɪn]

оставаться

to push

[puʃ]

толкать

to pull

[pul]

тянуть

push-pull

пушпул, пушпульный

push-pull amplifier

двухтактный усилитель

push-pull circuit

двухтактная схема

push-pull transformer

пушпульный трансформатор

feedback

обратная связь

feedback amplifier

регенеративный усилитель

feedback coil

катушка обратной связи

feeding transformer

силовой трансформатор

2. Put down the Russian for:

plate current supply

___________________________________

alternating current components

___________________________________

maximum grid voltage

___________________________________

transformer secondary winding

___________________________________

Fig. 16

Push-pull Amplifier

An amplifier is used to produce the output voltage greater than the input voltage. A push-pull amplifier includes two tubes. Their control grids are connected to the opposite ends of the input transformer secondary winding. The centre of this winding is connected to the tube cathodes. When maximum grid voltage is produced in one tube, minimum grid voltage is produced in the other tube. Thus, the sum of the plate currents remains constant.

The plate currents are fed into the opposite ends of the output transformer or a choke coil. It has its centre connected through the plate current supply to the cathodes. Thus direct current plate components are eliminated but alternating current components add in the circuit.

3. Complete these sentences, using the correct variant:

1. An amplifier is used

a) to separate a.c. from d.c.

b) to change the value of the input voltage.

2. The input voltage is increased

a) by means of a rectifier.

b) by means of an amplifier.

3. A push-pull amplifier includes

a) only one tube.

b) two tubes.

4. When maximum grid voltage is produced in one tube

a) maximum grid voltage is produced in the other tube.

b) minimum grid voltage is produced in the other tube.

5. The sum of the plate currents

a) changes.

b) remains constant.

6. D.c. components

a) are eliminated.

b) add in the circuit.

7. A.c. components

a) add in the circuit.

b) are eliminated.

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