Quantity   Component name
1 × U1 analog board Rev8 MC33178 op-amp for mic pre-amp on analog board Rev8
1 × U1 digital board Rev8C NE555 precision timer IC for mic muting status LED on digital board Rev8c
1 × U2 CM6400 USB integrated audio single chip MCU
2 × U4, U6 SN74LVC1G3157 SPDT Analog Switch for mic pattern switching and mic muting status LED
1 × U5 24LC02B serial I2C eeprom used in conjuction with U2
1 × U7
1 × U8 PCD4066B Quad Analog switch for mic input muting
1 × U9
1 × U10
1 × U11 MAX9722 Headphone audio amp