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<pre>Figure 1. PCB composition<pre>
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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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