四位BCD码数字显示电路，用了CD4511，、有功能、框图及说明，原理图及说明，调试分析，调试过程遇到的问题和相应分析和解决过程-four BCD figures show circuit, with the CD4511, a function block diagram and descr iptions. drawings and descr iptions, debugging, debugging problems encountered and corresponding analysis and resolution process