?Wholesale business?:We have been engaged in the wholesale and retail business of electronic related products for a long time. Welcome letter to discuss wholesale business. The larger the amount, the better the price. ?4?:Be proficient in using various common instruments, meters and electronic tools, and master the testing methods of the main parameters, technical or performance indicators of components and the whole machine;. ?3?:Master the basic methods and skills of debugging; learn to eliminate various faults in the welding and assembly process, and solve various problems encountered. ?2?:Compare the schematic diagram and the PCB board to understand the component layout, assembly (direction, process, etc.) and wiring of the "Circuit principle and key components";. ?1?:Master and understand the specific functions of each part of the circuit in the schematic diagram of "Circuit principle and key components", and improve the ability to read and recognize pictures;. ?learning target?:Through the assembly, debugging and production of the "Circuit principle and key components" machine, master the working principle of the "Circuit principle and key components", improve the skills of component identification, testing, assembly and debugging of the whole machine, and enhance the comprehensive practical ability. ?UNO R3 Component Pack (Starter Kit for Beginners)?: The kit includes all common components of UNO R3,More functional components need to be purchased separately.