说明：  以前电子设计大赛的论文集，有函数信号发生器、示波器、自动控制的平衡小车、收音机等的设计思想、制作电路图及相应程序流程图
(Before the collection of electronic design contest, the function signal generator, oscilloscope, the balance of automatic control car, radio, the design idea, the production of circuit diagrams and the corresponding process flow chart)