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                type or paste code here<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8"/>
    <meta name="viewport" content="width=device-width,initial-scale=1.0"/>
    <title>Documentation Page</title>
     <link rel="stylesheet" href="styles.css"/>
      <nav id="navbar">
        <header>Printed Circuit Board (PCB) Documntation</header>
        <a class="nav-link" href="#Introduction">Introduction</a>
          <a class="nav-link" href="#How_to_design">How to design</a>
          <a class="nav-link" href="#Free_software">Free software</a>
          <a class="nav-link" href="#Opensource_software">Opensource software</a>
        <a class="nav-link" href="#Actual_design">Actual design</a>
        <a class="nav-link" href="#Manufacturing">Manufacturing</a>
     <Main id="main-doc">   
        <section id="Introduction" class="main-section">
         <header class="sechead" >Introduction</header>         
      Printed circuit board is an electronic circuit that relies on DC current. </p> 
      <p>Components on this board are not connected by wire but by lines of copper stretched across a fiber board.</p> 
      <p>Such board is manufactured of fiber covered with a layer of copper.</p>
    <p> A design for connection lines in the circuit is printed on this layer then then the copper is removed except where the lines of design exist.</p>
     <p> These lines are used as the atcual copper connections.</p>
    <section id="How_to_design" class="main-section">
class="sechead">How to design</header>
      <p>To design a PCB you need some kind of software. In this regard the available software can be divided into categories.</p> 
        <li>For beginners and hobbyists, there is relatively simple software. One of the best is <code>Express PCB</code>.	</li>
        <li>	More advanced software may differ in many terms. A main difference is related to the number of layers that can be included in a design in a design.</li>
          <li>Highly advanced software may integrate PCB design with other industrial designs and manufacturing operations. An example is <code>Eagle</code>.</li>
     <p>Note that the number of layers in a design refers to an integrated circuit that is very small and is installed not on fiber but on a silicon wafer. </p>
      <section id="Free_software" class="main-section">
  <header class="sechead">Free  software</header>
  <p>Free software as the title suggests can be used for free. This category includes a variety of software.</p>
    <li>	Some are relatively simple and are intended to be used for training by students and beginner professionals. An example is the previously mentioned <code>Express PCB</code>.</li>
      <li>	All you need for downloading this software is to register your email while applying for a download. Its developers recover their cost by providing optional paid services for users.</li>
      <li>	Developers of other software that are more sophisticated cannot recover their costs by selling paid services. An example is the previously mentioned <code>Eagle</code>, which is used in return of subscriptions, remaining to be free for hobbyists and students. </li>
    <section id="Opensource_software"  class="main-section">
      <header class="sechead"> Opensource software</header>
      <p>There are similarities between free and opensource software. Important features are:</p>
          <li>Open-source software is generally released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software as well as its source code to anyone and for any purpose. </li>
            <li>	Opensource software allows any capable user to participate in development, making the number of possible contributors indefinite. In the meantime, the ability to examine the code facilitates public trust in the software. </li>
      <li>	Open source code can be used for studying and allows capable end users to adapt it to their personal needs in a similar way <code>User Scripts</code> and <code>Custom Style Sheets</code> allow for web sites. This results in savings for consumers</li>
      <p>These features apply to opensource PCB design software. I should refer to Wikipedia as the main source of this and of more information about this type of software.    </p>
   <section id="Actual_design" class="main-section">
     <header class="sechead"> Actual design</header>
       <p>	Actual PCB design may begin by doing a Schematic design as a guide for a Layout. </p>
         <li>The schematic is a plan for the circuit that includes selecting the components and specifying their electrical connectivity.</li>
         <li>The Layout is the process in which this plan is applied. In this process components are placed on the board and their actual connections are specified as on the physical board.</li>
         <li>You will use your problem-solving skills to place the components and specify their lines of connections within the tightly constrained space of the board.</li>
         <li>Before you are finished you have to check for mistakes of electrical connectivity. The schematic is the reference, and the software normally connects the layout to the schematic, doing the checking and telling you about the mistakes. </li>
     <section id="Manufacturing"
    <header class="sechead" >Manufacturing</header>
  <p>Steps for manufacturing include:</p>
    <li>Printing the board. It is not to be printed on paper but on fiber material. 
      <li>If silk screen is used, the board will be treated in an acidic solution to erase the redundant copper that is outside the lines of connectivity.
        <li>The ink is then removed and the placement holes are drilled in preparation for installing the components. 
          <li>Advanced methods don’t use silk screen, and the lines of connection are directly made by mechanically scratching the copper guided by the software.  </li>
            <li>Finally, the components are soldered at points of connection. For a small number of boards this can be done manually. For large quantities soldering is carried out by mechanically throwing molten tin on the boards while passing over a conveyer belt.</li>