[{"title":"( 3 个子文件 125KB ) AT89S52-24单片机最小系统开发板ALTIUM设计硬件原理图+PCB文件.zip","children":[{"title":"S52最小系统.PrjPCB <span style='color:#111;'> 24.34KB </span>","children":null,"spread":false},{"title":"S52最小系统.SchDoc <span style='color:#111;'> 129.50KB </span>","children":null,"spread":false},{"title":"S52最小系统.PcbDoc <span style='color:#111;'> 490.00KB </span>","children":null,"spread":false}],"spread":true}]