95年电子设计大赛的设计报告，自己训练时写的，实用低频信号放大器的制作-95-year Electronic Design Contest of the design report, written by their own training, practical production of low-frequency signal amplifier

09大学生电子设计大赛报告样例，给你提供点写报告的样板，很实用-09 university electronic design competition, the report offers you point to write a report template, very practical