BALANCED_INPUT_MICROPHONE_PREAMP

Published:2009/6/29 22:21:00 Author:May | From:SeekIC

Use of two wires for microphone signal and separate wire for ground keeps hum and noise at minimum. Signal wires are twisted together in shield acting as ground. Net gain is 52 dB, giving 0-dBm output for nominal 2-mV input.Noise performance is -86 dB below 2-mV input level, and rejection of commonmode signals is 60 dB.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 2-37-2-40.



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