In this course we will study about how to run digital circuit without hardware. A graphical design tool called Digital Works3.0 enables you to build digital logic circuits and simulate and analyses their behavior. This software digital work 3.o is freely available on internet. If you search on Google then you get easily. We can operate on Windows XP, Vista, 7/8, or 8. In digital work 3.o is freely available. Create logic circuits using AND, NOT, NOR, OR, XOR, and other simple gates, or flip-flops like D, JK, or RS and simulate your creations in a virtual environment to analyze them. In this course we will study about how to use this software. In first lecturer we will study about how to download and what is the appearance of software. In second lecturer we will study about how to verify functionality of logic gates though software we take NOT gate as example. In Third lecturer we will study about how to use IC(Integrated Circuit),we take AND IC as example, in lecture i will explain you about how to verify AND gate using IC .In fourth lecture i will explain you about Mod n counter and how to simulate MOD 10 counter using IC Ripple counter IC).