Hi there,
For 2 mic, please refer to <LINK_TEXT text=“https://github.com/SeeedDocument/MIC_HA … AT_SCH.pdf”>https://github.com/SeeedDocument/MIC_HATv1.0_for_raspberrypi/raw/master/src/ReSpeaker%202-Mics%20Pi%20HAT_SCH.pdf</LINK_TEXT>
For 4-mic linear array hats, please refer to below.
cheers
Bill