基于Keil C51的晶体管测试仪（改为其他型号的单片机很容易，关键是STC12C5052AD比较便宜），里面的特征测试要用到AD转换，功能：基本晶体管引脚识别，hFE，二极管引脚识别，PN及NP压降，单向可控硅引脚识别，触发电压及维持偏压测试。-Based on Keil C51 transistor tester (to other types of microcontrollers is easy, the key is STC12C5052AD cheaper), which use t