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A printed circuit board mechanically supports and electrically connects electronics components using conductive tracks, pads, and other features etched from copper sheets laminated onto a non-conductive substrate. Components are generally soldered on the PCB. Advanced PCBs may contain components embedded in the substrate.
Soldering is a process in which two or more items are joined together by melting and putting a filler metal into the joint, the filler metal having a lower melting point than the adjoining metal. Soldering differs from welding in that soldering does not involve melting the work pieces. In brazing, the filler metal melts at a higher temperature, but the work piece metal does not melt. In the past, nearly all solders contained lead, but environment and health concern have increasingly dictated use of lead free alloys for electronics and plumbing purposes.
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The Main Task in Designing a PCB is Figuring out Here all The Components are Going to Go. Normally there is a Design or Schematic That will be Turned into a PCB. There is no Such Thing as a Standard Printed Circuit Board. Each Board is Designed Fonts own Use and Must be The Right Size to Fit The Required Space .Board Designers Use Computer Aided Design Software to Layout The Circuited Signs on The Board. The Spaces between Electrical Paths are often 0.04inches or Smaller. The Location of The Holes for Component Leads or Contact Points are also Laid Out. Once The Circuit Pattern is Laid Out a Negative Image is Printed out at Exact Size on a Clear Plastic Sheet. With a Negative Image, The Areas That is Not Part of The Circuit Patterns For a Computer-Controlled Drilling Machine or for the Automatic Solder Paste Used in the Manufacturing Process.