Compare normal rectifier with precision rectifier.

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Normal Rectifier	Precision Rectifier

Ordinary rectifier diode can rectify the signal after 0.6V.	Precision rectifier can rectify the signal of order of mV.
It consist of ordinary diode.	It consist of OP-AMP and diode.
It uses transformer at input side in order to step up or step down the voltage.	It do not use transformer.
It is less stable.	It is more stable.
It is as power supply for radio, television and computer.	It is useful,for high precision signal processing.
Poor efficiency.	Good efficiency.

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