Reinforces the direction of an amplifier’s output voltage change, while negative feedback does just the opposite.Ī familiar example of feedback happens in public-address (“PA”) systems where someone holds the microphone too close to a speaker: a high-pitched “whine” or “howl” ensues, because the audio amplifier system is detecting and amplifying its noise. If some percentage of an amplifier’s output signal is connected to the input, so that the amplifier amplifies part of its output signal, we have what is known as feedback.įeedback comes in two varieties: positive (also called regenerative ), and negative (also called degenerative ).
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