MAX9812 speech amplifier, pickup preamplifier

Overview

The sensor is used for sound detection. The module uses a 4-12V wide voltage input and a MAX9812 voice chip. It has left and right channel outputs and can be directly connected to the headphone holder.

Refer to the schematic diagram in the specification sheet

schematic,

A voltage regulator is added so that a wide voltage input can be applied.

PCB board diagram

There is no copper covering the entire area, considering that this board will not be mass-produced, so it is convenient for hand soldering.

It has been verified in practice that it feels average and can be used without any eye-catching design.

Welcome your criticism and guidance. Attached are the project documents.

Design Files

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Update:2025-06-19 22:35:44

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