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　　　　(1) High contact resistance affects electrical measurement;　　(2) Not suitable for wire welding;　　(3) Poor thermal stabili

　　Reasonable design of multi-layer pcb circuit board assembly not only involves the quality of the circuit board, but also di

　　　　1. Poor warpage welding　　During the soldering process, circuit boards and components warp, causing defects such as virtua

　　　　The circuit board will not be well tinned during SMT production. Generally, poor tinning is related to the cleanliness of

　　　　One, the definition of thick copper plate　　thick copper board refers to a printed circuit board with a copper thickness

　　　　Double-sided circuit board is the middle layer of medium, and both sides are wiring layers. A multi-layer circuit board i