DIY Soldering Practice Kit with NE555 and CD4017 for Rotating LED Display This DIY kit is a practical training board built around the NE555 timer and the CD4017 decade counter to produce a rotating LED chaser effect. It is designed for hands on SMD soldering practice and for learning basic timing and counting circuits. Key benefits Focused skill development: Practice SMD soldering techniques on a real circuit while assembling a working LED chaser. Ideal for beginners who want structured, repeatable practice. Learn core electronics concepts: See how a NE555 timing circuit and a CD4017 counter combine to create sequential LED rotation. Useful for understanding timing, sequencing, and simple digital logic. Visual feedback for troubleshooting: The rotating LED sequence makes it easy to verify solder joints and component orientation, helping diagnose common assembly issues quickly. Compact and practical: A purpose built PCB concentrates learning on common SMD components and standard hobby wiring without unnecessary complexity. Main features and attributes Function: NE555 timer provides clock pulses that drive the CD4017 decade counter to step LEDs in sequence, producing a rotating LED effect. SMD practice focus: Board layout emphasizes surface mount component placement and soldering, offering real world SMD handling experience. Compatibility: Works with common hobby soldering irons, SMD tools, and basic bench power supplies. Suitable for use with standard LED types and common passive components used in training kits. Size and construction: Compact printed circuit board designed for benchtop assembly and easy mounting on a test surface. PCB uses standard construction appropriate for electronics training. Performance: When assembled correctly, the circuit produces a clear, repeatable rotating LED sequence that demonstrates timing and counting operation. Recommended use scenarios Technical training class: Use as a classroom exercise to teach SMD soldering, PCB inspection, and basic timing and counter circuits. Hobbyist skill building: Practice SMD soldering and circuit assembly at home while building a functional LED chaser for demonstrations or small displays. Project debugging and learning: Use the visible LED sequence to learn component testing and troubleshooting steps, such as checking solder joints, polarity, and signal flow. What this kit helps you achieve Build practical SMD soldering experience on a functioning electronic circuit. Understand how timing and counting ICs work together to produce sequential outputs. Gain confidence in assembly, inspection, and basic troubleshooting of PCB based electronics. This kit is suitable for electronics learners, hobbyists, and technical instructors who want a straightforward, hands on way to practice and teach soldering and circuit basics.