# SSM2015 microphone preamplifier circuit

A simple microphone preamplifier can be designed using SSM2015 chip, manufactured by Precision Monolithics Inc. (PMI), which provides high gain and low noise.

This SSM2015 microphone preamplifier circuit has a high gain about 1000. Resistance R3 sets the operating point of the input differential amplifier and determine the bandwidth and speed of growth.

Resistance R3 allows adjustment of input source impedance differential amplifier: if Z = 600 ohms, R3 is the optimum value of 33 k. With a 600 ohm resistor across the input, the signal / noise is the order of 86 dB.

Circuit Diagram:

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