1 Best example of positive feedback is the release of oxytocin during childbirth. 2  Labor contractions are stopped when the stimulus to the pressure receptors ends and when oxytocin production stops in turn.
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A demodulator is a circuit used in AM (amplitude modulation) and FM (frequency modulation) receivers to separate the information that was modulated onto the carrier from the carrier itself.It could be audio and/or video information, or other data. A demodulator is the analog of the modulator. A modulator modulates the carrier frequency, while a demodulator detects the modulation on the carrier wave and recovers the original lower frequency waveform at the destination.   For many years the modulated carrier wave was converted to a radio signal.