Small, stable LED flow module for DIY electronics projects that creates a water light effect and lets you control flow speed. Key benefits Adjustable visual speed: change R4 to smoothly control the LED flow speed, so you can match the animation timing to your project without rewiring. Compact and easy to integrate: at 5.4 x 2.1 cm and 1.6 mm thick, the module fits into tight enclosures and on custom PCBs, simplifying mounting and layout for hobbyists and makers. Eye-catching effect with low complexity: ten LEDs driven by CD4017 produce a continuous water light effect without complex programming or extra controllers. Reliable, self-contained circuit: NE555 (clock generation) and CD4017 (decimal counter) provide a simple, proven design that delivers stable, repeatable performance for prototypes and finished builds. How it solves common problems Eliminates the need for microcontroller programming for basic flowing-light effects by using tried-and-true NE555 + CD4017 logic. Offers on-board speed adjustment (R4) so you can tune animation behavior in place instead of changing code or redesigning hardware. Small footprint reduces enclosure and mounting constraints when adding animated lighting to existing projects. Practical applications Model displays and scale dioramas: add flowing-light effects to trains, ships, or city scenes for realistic illumination. Learning and prototyping: ideal for hands-on electronics experiments that teach clock and counter circuits without complex setup. Decorative lighting and small signage: integrate into accent lighting, table displays, or small signs where a simple chasing/wave effect is desired. Key specifications and functions LED count: 10 LEDs driven by CD4017 for a sequenced water light effect Control: adjustable R4 to change LED flow speed Core ICs: NE555 for clock generation, CD4017 as decimal counter Size: 5.4 x 2.1 cm Thickness: 1.6 mm Target users: hobbyists, makers, and DIY electronics builders seeking a compact, stable flowing-LED module Compatibility notes Designed for straightforward integration into electronic circuits and breadboard/PCB projects. Use with appropriate power supply and wiring consistent with NE555/CD4017 requirements.