It was "buried" deep among all the forum threads.last year, I start a thread talking Qingming festival,Its fast,its also 5th April I tried to dig up that thread but failed. I am planing to a place with old buildings
Thanks L.Chung,I found it,but rules said this thread is too old,may people dont want to discussIt was "buried" deep among all the forum threads.
If you want to resurrect it, here is the reference.
http://forum.allaboutcircuits.com/showthread.php?t=36467