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[[File:PCB Composition.png|center|PCB Composition]]
 
[[File:PCB Composition.png|center|PCB Composition]]
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<Figure 1. PCB composition style="text-align: center;">
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Figure 1. PCB composition
   
   
 
   
 
* <u>Substrate (FR4)</u>: The substrate (FR4) is fiberglass which gives the board rigidity and insulates each side from the other.  
 
* <u>Substrate (FR4)</u>: The substrate (FR4) is fiberglass which gives the board rigidity and insulates each side from the other.  
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Figure 2. PCB internal routes  
 
Figure 2. PCB internal routes  
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Through hole vias are the most common and the cheapest, since it is easiest to drill a hole all the way through a piece of material with layers that have already been sandwiched together.  
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Through hole vias are the most common and the cheapest, since it is easiest to drill a hole all the way through a piece of material with layers that have already been sandwiched together.
    
== Safety ==
 
== Safety ==
MakerRepo Staff, MakerRepo Volunteers
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