Davide Gironi writes:
This is an op-amp Electret Condenser Microphone Preamp board design for the use with microcontrollers ADC.
For the NPN version of this board, an for more information about microcontroller ADC and microphone input, please refer to this page
The proposed circuit is just a revision of a pretty usually op-amp electret mic preamplifier.
The selected op-amp is the TLC272, because it can be drive in single rail operation, it’s common mode input range, and has good noise performance. Also other op-amp could work. The op-amp is configured in inverting mode.
Check out the video after the break.