Possible Duplicate:
Circuit Simulation Software
My friend is starting to learn some basic electronics as a hobby, and i have some knowledge on the subject from school. So I am looking for a software that will allow me to design and visually simulate simple circuits, for example I want to make a couple of leds to blink using a few transistors, and I want the software to visually show me the leds blinking.
Is there any software that can do this?