实用低频功率放大器原理图和PCB图文件，包含PDF和Altium designer 完整工程源文件.可用于毕设等-Practical low-frequency power amplifier schematic and PCB image files, including PDF and Altium designer complete project source files.

全志A31原理图，里面有详细的外围电路可供参考。本人没原文件只有pdf格式-All A31 schematic, which has a detailed peripheral circuit for reference. I do not have the original file only pdf format.

他激式雾化器线路图文件 DXP及PDF格式(The schematic diagram of his excited atomizer DXP and PDF format)