Analog Electronics Power Amplifiers and 555 Timer and Voltage Regulators Power Amplifier

Consider the following circuits:

1. Oscillator

2. Emitter follower

3. Power amplifier
Which of the above circuits employ feedback?

1

1 and 2 only

2

2 and 3 only

3

1 and 3 only

4

1, 2 and 3

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