4-Bit Ring Counter using 74273 & 555 Timer | DLE Lab Project

In this video, I build a 4-bit ring counter using a 74273 octal D flip-flop IC and a 555 astable timer — my Digital Logic Electronics (DLE) lab project. A ring counter circulates a single HIGH bit through 4 flip-flops in a loop, lighting one LED at a time in sequence. It demonstrates core Digital Logic concepts like synchronous sequential circuits, shift registers, feedback loops, and clock generation. 🔧 Components Used: - 74273 Octal D Flip-Flop IC - 555 Timer (astable mode) - 4× LEDs + 220Ω resistors - 70µF capacitor - Potentiometer (speed control) - 1kΩ resistors - 2× Pushbuttons - Breadboard & jumper wires 📚 Concepts Covered: ✔ D flip-flop operation ✔ Shift register behavior ✔ Synchronous clocking ✔ 555 astable multivibrator ✔ Initial state problem & reset logic ✔ Feedback loop topology