USB sound card, we recommend to look at the production platform PROTEL99SE. have design drawings, interested can see,

Packet : 63535271usb_sound_card.rar filelist
USB_Sound_Card\pcm2702.pdf
USB_Sound_Card\USB电子管声卡 耳机大家坛.mht
USB_Sound_Card\sch.jpg
USB_Sound_Card\sch.bmp
USB_Sound_Card\解码部分.bmp
USB_Sound_Card\电源及放大部分.Sch
USB_Sound_Card\解码部分.Sch
USB_Sound_Card

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