Sensitive microphone
Posted: Sat Jun 07, 2014 4:59 am
I am working on a mini project for a school who want to detect sound levels in the classroom and been going around in circles for a few weeks. They want to measure sound levels but ranging from very low sound i.e. chair moving, door opening to levels of talking within the classroom.
I appreciate to get an accuracy levels a number of microphones located in different parts of the classroom would need to be used. But, just to be able to monitor sounds levels I would like to build a simple sound meter.
I have been trying to use the MEMS Microphone Breakout & Electret Microphone Breakout and not getting any type of response, either the voltage is too low to measure on the arudino and the pre-amplifiers do not work and just seeing loads of noise on the signal line. I have ordered the lm386 OpAmp Breakout which I hope will amplifier the signal from the microphone boards.
I have used many of the Arduino type microphones and built pre-amps using lm358, 386 and BC548 circuits but none of them provide the response I am looking for. Many of the circuits seem to be very noisy and not seeing the response which I am looking for.
Audio analogue electronics is not my area of expertise and looking for some ideas on suitable circuit and design.
I appreciate to get an accuracy levels a number of microphones located in different parts of the classroom would need to be used. But, just to be able to monitor sounds levels I would like to build a simple sound meter.
I have been trying to use the MEMS Microphone Breakout & Electret Microphone Breakout and not getting any type of response, either the voltage is too low to measure on the arudino and the pre-amplifiers do not work and just seeing loads of noise on the signal line. I have ordered the lm386 OpAmp Breakout which I hope will amplifier the signal from the microphone boards.
I have used many of the Arduino type microphones and built pre-amps using lm358, 386 and BC548 circuits but none of them provide the response I am looking for. Many of the circuits seem to be very noisy and not seeing the response which I am looking for.
Audio analogue electronics is not my area of expertise and looking for some ideas on suitable circuit and design.