4.2 Printed Circuit Boards Flashcards
What is copper laminated paper used for?
Mostly in radio and Tv
What is copper laminated paper with epoxy resin used for?
Flame resistant properties
What is copper laminated glass silk weave used for?
Strong against mechanical stress
Laminated paper for additive processes is used for what?
Circuit boards that are printed on both sides.
What is the first step of PCB?
Patterning
What is patterning?
Process of converting a circuit diagram into a pattern of connected conductors and spaces for the components.
What two methods of printing are there?
Etching method
Addition method
What is the etching method?
The surface begins as a complete layer of conducting material and a pattern is removed by dipping the surface into an acidic solution.
What is the addition method?
The surface begins as a complete layer of an insulator and a pattern is added by dipping the surface into a copper plating solution.
What is used as an insulating base in flexible circuits?
Mylar and Kapton
What does SMT stand for?
Surface mount tecnology
What is SMT?
Way of attaching electronic components to a printed circuit board
What are some of the advantages of SMT?
Smaller
Cheaper
Denser
What are some disadvantages of SMT?
Harder to clean
More heat
Harder to hand assemble
What is offset pad mounting?
The lead is passed through a hole and bent so that it can be surface mounted
