# Amplifiers

### Explanation of question 11

Two matched transistors are connected as a complementary pair. The two transistors must be

1. one pnp and one npn
2. both pnp
3. both npn
4. supplied via a transformer

The answer is :- 1 Must have a pnp and an npn — hence ‘complementary’. (sometimes called a transformerless output stage).

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