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A low-noise microphone preamplifier

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1 Author(s)
A. Bereskin ; University of Cincinnati, Cincinnati, Ohio

This paper describes a low-noise two-transistor pre-amplifier which has been developed for use with microphones. For a source resistance of 1000 Ω, a noise figure of 1.3 db has been achieved. A corresponding middle-frequency gain of 40 db, bandwidth of 30 kc and output impedance of 175 Ω resulted.

Published in:

IRE Transactions on Audio  (Volume:AU-9 ,  Issue: 3 )