HIGH_GAIN_DYNAMIC_MICROPHONE_PREAMPLIFIER

Published:2009/6/18 23:50:00 Author:May | From:SeekIC

This microphone preamplifier is capable of about 70 dB or more gain at audio frequencies. Its gain is approximately equal to the product of the hfe of both transistors times the ratio of the load resistance to the input resistance of the preamp. As an approximation, these resistances are usually similar in value (≈2 to 5 kΩ) for most applications, so this ratio can be taken as unity.



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