PCB

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PCB

  1. 1. PCB Shweta jadhav
  2. 2. A PCB is a printed circuit board, also known as a printed wiring board. It is used in electronics to build electronic devices. A PCB serves two purposes in the construction of an electronic device; it is a place to mount the components and it provides the means of electrical connection between the components.
  3. 3.  Conducting layers are typically made of thin copper foil.  The board is typically coated with a solder mask that is green in color. Other colors that are normally available are blue and red.  Unwanted copper is removed from the substrate after etching leaving only the desired copper traces or pathways
  4. 4.  Components  Pads  Traces  Vies  Top Metal Layer  Bottom Metal Layer
  5. 5.    Components are the actual devices used in the circuit. This includes input/output connections. I/O ports, including power supply connections, are also important in the PCB design.
  6. 6.     The PCB needs to be mechanically secured to something. Could be the chassis-consist of metal frame on which the circuit boards and other electronic components are mounted. Could be another PCB/socket on PCB. Could be attachments to a heat sink.
  7. 7. High frequency circuits Series Inductance Shunt Capacitance Inductive Coupling Capacitive Coupling
  8. 8. Steps in PCB design process
  9. 9. 1. Film Generation
  10. 10. 2. Shear Raw Material Industry standard 0.059" thick, copper clad, two sides
  11. 11. 3. Drill Holes
  12. 12. 4. Electrolux copper Apply copper in hole barrels
  13. 13. 5. Apply Image Apply Photosensitive Material to develop selected areas from panel
  14. 14. 6. Strip and Etching •Remove dry film, then etch exposed copper •Tin protects the copper circuitry from being etched
  15. 15. 7. Solder Mask Apply solder mask area to entire board with the exception of solder pads
  16. 16. 8. Solder Coat Apply solder to pads
  17. 17. 9. Silkscreen Apply white letter marking using screen printing process

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