作者说:“The 47 ohm is there to isolate the "signal ground" from "real ground". This value is not critical. I have tried with resistors up to 100 ohm and that too works fine. There is under 2 mAac through this resistor.”作者: hotpoint 时间: 2003-2-20 00:00 标题: PROTEL的BUG吧? 原理图这样画的,看桥堆!没错的: