Full Subtractor Explained with Truth Table & Circuit Diagram |4-Bit Ripple Borrow Subtractor Example

Learn Full Subtractor in Digital Electronics with simple explanation, truth table, circuit diagram, and practical example. In this video, we explain how a Full Subtractor works with 3 inputs (A, B, Borrow-in), and how it differs from a Half Subtractor. We also cover Borrow-out concept and show how multiple Full Subtractors are connected to design a 4-bit Ripple Borrow Subtractor for binary subtraction.

This tutorial is perfect for Computer Science (CS), IT, and Electronics students studying Boolean Algebra, Logic Gates, and Digital Circuits in their college syllabus.

👉 Topics Covered:
Full Subtractor basics
Truth table & logic equations
Difference vs Borrow outputs
Borrow-in and Borrow-out explained
Full Subtractor circuit diagram
4-bit Ripple Subtractor example

📚 Related Videos:
Half Subtractor – https://www.youtube.com/watch?v=l0GyIQuZfTI

📚 Full Digital Electronics & Boolean Algebra Course : https://www.youtube.com/watch?v=NqPhPiSer30&list=PLIY8eNdw5tW-yJHsxApeilNjX2Dkll-Ox

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0:00 Introduction & Recap
01:24 Full Subtractor Theory
04:39 Truth Table of Full Subtractor
09:23 K-Map of Full Subtractor Output Expressions
17:15 Circuit Diagram of Full Subtractor
20:58 4-bit Ripple Borrow Subtractor Example
28:49 Summary & Conclusion

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