用protel DXP设计的F2812-USB电路板，本工程包括FPGA程序和CY7C68013固件程序的PCB原理图和PCB板图。-With protel DXP designed F2812-USB circuit board, the works include the FPGA programs and CY7C68013 firmware for PCB schematic and PCB board diagram.

目前普遍采用的USBHUB芯片GL850G官方demo板图纸，gang模式下原理图。注意是GL850G不是GL850!-Now widely used USBHUB chip GL850G official demo board drawings, gang mode schematic. Note that GL850G not a GL850!

AC6901电路板原理图，用于指导以AC6901为核心的包含蓝牙/收音机/USB/SD卡等音频传输播放功能硬件系统开发。(Schematic diagram of AC6901 circuit board to guide the AC6901 as the core, including Bluetooth / radio /USB/ SD card audio transmission function hardware system development)

非常好用的，很稳定的，UPD720114电路图，用于USB HUB设计(UPD720114 circuit diagram)