这里稳压管+二极管组合的作用
https://mp.weixin.qq.com/s?__biz=MzAxNjY2MzkyNg==&mid=2707855269&idx=1&sn=9f3b77e68d5637c245ee31dbbee00ee8&chksm=bf6363bc8814eaaa2272ebb8136ed34fd04651386495c5e421d05cd6521400e1d68ec96bd5f8&mpshare=1&scene=23&srcid=0620MPHmLtP5r2EimaHTipLc&sharer_sharetime=1624176709457&sharer_shareid=933c50f03557827431ebd116eeb4f279#rd |