Low_impedance_microphone_preamplifier

Published:2009/7/23 23:10:00 Author:Jessie | From:SeekIC

In this preamp, the transformer converts the low microphone impedance up to a value (about 7 kΩ) required by the OP-47 for best noise performance.C1 rolls off the high-frequency response at 90 kHz, giving a noise power bandwidth of 140 kHz.



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