Stream microphone through PC over

You could multicast an udp stream to your local network from ffmpeg and play it from your mobile device, on Android I use MX Player. My setup:

ffmpeg -f dshow -i audio="USB Mic (2- Samson GoMic)" -c:a libmp3lame -f mpegts udp://192.168.0.255:12345

To get your device name you can use

ffmpeg -list_devices true -f dshow -i dummy

I can also get VLC to work with these settings: