Nowadays all smartphones have very good quality microphones. Why not use them a mics?
Just plug your smartphone's earphone output to a recorder device or a PC and use the app for recording or streaming your meetings, breafings, classes, ...
This app is under GPL v3 license. Source code: https://sourceforge.net/projects/ambienphon/
The icon is under CC0 license an can be found at https://openclipart.org/detail/3989/icon-microphone