4-Bit Adder-Subtractor using 74LS83 and CD4070

What is this project about?

This project is a 4-bit adder and subtractor, a digital circuit capable of performing both addition and subtraction on 4-bit binary numbers. It integrates logic gates and essential ICs to demonstrate fundamental arithmetic operations in electronics.

Why did I make it?

I created this project to explore digital arithmetic circuits and understand how basic mathematical operations are handled at the hardware level. It’s a hands-on learning experience that helps reinforce concepts in embedded systems, automation, and digital logic design.

How does it work?

• The circuit consists of a 4-bit full adder (SN74LS83N), XOR gates (CD4070), and display drivers (CD4511) to perform binary addition and subtraction.
• Using DIP switches, users can input two 4-bit numbers (A & B).
• A control signal determines whether the circuit operates as an adder or subtractor.
• The result is displayed on 7-segment displays, allowing real-time visualization of the calculations.

See it in action!

Images and videos showcase the schematic design in TinkerCAD, the simulation in Proteus, and the final soldered circuit built with physical components.