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A low-noise transistor microphone amplifier

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2 Author(s)
Mcwhorter, M.M. ; Vidar Corporation, Mountain View, CA, USA ; Warner, G.

A microphone amplifier is described which possesses good noise characteristics at all gain settings and the capability of handling large input signals without appreciable distortion at low gain settings. A single potentiometer is used as the gain control to 1) vary the negative feedback to provide high overload capability at low gain, and 2) attenuate the output to provide a minimum gain of zero. The circuit is developed from a two-transistor building block.

Published in:

Audio and Electroacoustics, IEEE Transactions on  (Volume:14 ,  Issue: 1 )