I am working on a project using a microphone/microcontroller combination to detect if a clap has occurred.
Thus far, I am using the Electret Microphone Amplifier - MAX4466 with Adjustable Gain from Adafruit, which uses a CMA-4544PF-W Elecret Condenser Microphone as well as the MAX4466 LNA.
For this project, I need to be able to detect claps from up to 30 ft away. After some testing with the microphone on maximum gain, I found that the microphone can certainly pick up sound from that distance but only strong, loud sounds. Thus, I am inclined to believe that I need a bit more gain from my microphone.
I don't know too much about audio amplification, and am curious what direction to proceed in. I would estimate that I need a gain in the ballpark of ~6dB-20dB ON TOP of the already existing microphone amplifier that I linked above.
Thus far, my thought process has led me to 3 options:
Cascade another LNA with the current amplifier.
Use a single-ended op-amp with a low gain. My logic here is that an LNA in the adafruit mic/amp has already amplified the signal ignoring as much noise as possible, I could possibly just use a standard amplifier at this point.
- Use a completely different LNA with higher gain with the microphone. This was my first idea, but I was finding that the MAX4466 already has a gain larger than most of the other LNA's I was looking at.
Any input or other ideas would be appreciated!