Neltner Labs

Tutorials and Projects from Brian Neltner

Schematic of microphone and pre-amp for low-noise 8-bit ADC.

saikoled:

This post discusses how I went about integrating a microphone into the myki such that the low-resolution 8-bit ADC on the ATmega32U4 would be able to get a reasonable noise level.

In the myki light, this is done using the MAX9814, a single chip microphone amplifier with autogain control to prevent clipping and a low-noise microphone bias convenient for use with electrolet microphones. 

For a detailed circuit schematic as well as an explanation of how to use the MAX9814, please see below the break.

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