LOW_NOISE_TRANSFORMERLESS_PREAMP

Published:2009/6/29 1:59:00 Author:May | From:SeekIC

Noise performance of balanced microphone preamp is improved with instrumentation amplifier configuration of three opamps. Each half of LM387A is wired as noninverting amplifier.LM387A serves to amplify low-level signals VOUT while adding as little noise as possible, leaving common-mode rejection for LF356.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 2-37-2-40.



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