This device features a low-noise front-end amplifier, a variable gain amplifier (VGA), an output amplifier, a microphone bias voltage generator, and an AGC control circuit all inside a single chip. The main component of this project is the MAX9814 which is a low-cost, high-performance microphone amplifier with automatic gain control (AGC) and low noise microphone bias. The brain of the project is the Arduino Nano that you can see in the schematic. ![]() The complete Schematic diagram for the Arduino Based Spy Bug is shown below.
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