schematic builder/simulator

i use electronic workbench at school, but thats pretty expensive. are there any free substitutes?

LTSpice. Free download at linear.com

thanks, it works pretty well

Check out the LTSpice User's Group on Yahoo.com. You must register to view the content, but there are lots of knowlegable folks, sample circuits, and models there. Any question you come up with has probably been asked before, so be sure to use the Search feature before just blasting out a question.