Circuit Maker is one of the circuit simulation program this is a chance to get it FOR FREE from the page " http://babbage.cs.qc.edu/courses/cs343/Circuit_Maker " thispage is an itroduction to use the programon it there is a link to download the program for freebut it is STUDENT VERSION its size is about 3.4 mega bytessee you with another free program (it will be the second)for more free programs :this is my blog : ===> www.mday2004.blogspot.comon it : (1)google search-(2)sign up for google adsense-(3)free programs websites---(4) two links supported by google { click on one at least}