Dear sir, Regarding to the RC circuit source code that you want to send me, i still no get it....i'm facing problem in doing the simulation. can you please help me and send me the source code for reference as soon as possible....it's very urgent......thank you very much!!!! my email: lsc_8100@hotmail.com the url: http://www.phy.ntnu.edu.tw/java/rc/rc.html thanks for your help.............i really need it......