What Inside of D30-II amplifier

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Come and see the full range of 8-12 Inch 40Wrms Board Digital Bluetooth Stereo Amplifier that can be used with AC220V DC12V24V

board name SZM-D30 V2
D30-II board control SZM-DA101 V3
HT3163 schematic Pin out
D30-II Pictures and Features
D30-II Soundcheck