Comprehensive Circuit Learning Set: This adjustable direct current power supply set demonstrates complete circuit functionality with four modules, enabling practical understanding of potential regulation principles. Adjustable Output Feature: proposals smooth power modification through potentiometer with great accuracy and low fluctuation, ideal for small experiments and consistent power requirements. Complete Component Collection: Contains power adapter, printed circuit board, resistors, capacitors, diodes, transistors, and connection cable for immediate setup without additional purchases, improving soldering skills. Beginner Friendly Layout: Clearly arranged circuit design with detailed guidance ensures simple assembly and problem solving, assisting users in quickly grasping series power management concept. Reusable Educational Tool:with standard printed circuit board and basic electronic components for stable function, appropriate for repeated assembly, teaching, academic projects, and innovative experiments.