Consumer Electronics

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NEGATIVE FEEDBACK

The gain of an amplifier can be stabilised and the internally generated distortion reduced by introducing negative feedback. This can be applied from the output to input of a single stage or alternatively over several stages. With single stage common-emitter amplifiers, negative feedback can be obtained in two ways; by feedback from collector to base (Fig. 19.4) via R_F, or by including an unbypassed resistor R_E in the emitter circuit. The latter is very useful and is commonly used.

Fig 19.3 Tone control

Fig. 19.4

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