I need some kind of sound sensing in my microcontroller project. I have a condenser microphone and some transistors around, so while prototyping I found this circuit:
With my parts on hand and removing the C2 cap because it didn't work, I got this working circuit:
However, the signal amplitude is very low, I get peaks only when clapping. The noise floor is around 225mV and my peaks are at 230mV at best. So which parts in my circuit do I have to change to get stronger peaks? Do I add another transistor or change some resistors?
Also is there a better solution for this usecase like a dedicated chip? Ideally I want something like the sparkfun sound detection modules but integrated on my own PCB.