<div class="entry-content">
    <div class="jetpack-video-wrapper"><span class="embed-youtube" style="text-align:center; display: block;"><iframe src="https://www.youtube.com/embed/rMoTqSC9wrY" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
In this tutorial you will design and build your own keyboard. You will also learn all the essentials to design and build any electronics. Enjoy!
    </div>
    
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://github.com/FEDEVEL/custom-keyboard">Github (HW + 3D + SW)</a></li>
            <li class="links-list-item"><a href="https://fedevel.com/courses">FEDEVEL Online courses</a></li>
        </ul>
    </div>  
</div>

Tutorial - Custom DIY Keyboard Design and Build | Part 2: Keyboard Schematic

<div class="entry-content">
    <div class="jetpack-video-wrapper"><span class="embed-youtube" style="text-align:center; display: block;"><iframe src="https://www.youtube.com/embed/N4cLFE0FF2U" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        In this tutorial you will design and build your own keyboard. You will also learn all the essentials to design and build any electronics. Enjoy!
    </div>

    <div class="blog-content-chapters">
        <div>
            Chapters:
        </div>
        <ul class="chapters-list">
            <li class="chapters-list-item"><span class="chapters-time">00:00</span><span class="chapters-text">What is this tutorial about</span></li>
            <li class="chapters-list-item"><span class="chapters-time">03:34</span><span class="chapters-text">Starting a new project</span></li>
            <li class="chapters-list-item"><span class="chapters-time">08:42</span><span class="chapters-text">Adding RP2040</span></li>
            <li class="chapters-list-item"><span class="chapters-time">14:43</span><span class="chapters-text">Adding 100nF</span></li>
            <li class="chapters-list-item"><span class="chapters-time">20:12</span><span class="chapters-text">Adding 2.2uF</span></li>
            <li class="chapters-list-item"><span class="chapters-time">23:14</span><span class="chapters-text">Adding 200R</span></li>
            <li class="chapters-list-item"><span class="chapters-time">25:43</span><span class="chapters-text">Adding 27R</span></li>
            <li class="chapters-list-item"><span class="chapters-time">27:40</span><span class="chapters-text">Adding USB-C connector</span></li>
            <li class="chapters-list-item"><span class="chapters-time">31:25</span><span class="chapters-text">Adding ESD protection</span></li>
            <li class="chapters-list-item"><span class="chapters-time">34:03</span><span class="chapters-text">Adding 1uF</span></li>
            <li class="chapters-list-item"><span class="chapters-time">36:10</span><span class="chapters-text">Connecting USB CC pins</span></li>
            <li class="chapters-list-item"><span class="chapters-time">36:46</span><span class="chapters-text">Adding 5.1k</span></li>
            <li class="chapters-list-item"><span class="chapters-time">38:21</span><span class="chapters-text">Voltage regulator 5V to 3V3</span></li>
            <li class="chapters-list-item"><span class="chapters-time">42:27</span><span class="chapters-text">Adding 47uF</span></li>
            <li class="chapters-list-item"><span class="chapters-time">45:49</span><span class="chapters-text">Crystal ABM8-272-T3</span></li>
            <li class="chapters-list-item"><span class="chapters-time">47:22</span><span class="chapters-text">Adding 1k</span></li>
            <li class="chapters-list-item"><span class="chapters-time">48:32</span><span class="chapters-text">Adding 15pF</span></li>
            <li class="chapters-list-item"><span class="chapters-time">49:48</span><span class="chapters-text">Adding 1M</span></li>
            <li class="chapters-list-item"><span class="chapters-time">52:52</span><span class="chapters-text">Flash W25Q128JVS</span></li>
            <li class="chapters-list-item"><span class="chapters-time">58:20</span><span class="chapters-text">Boot Select Button</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:01:09</span><span class="chapters-text">Adding 100k</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:03:10</span><span class="chapters-text">Reset Button</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:04:28</span><span class="chapters-text">Adding 10k</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:08:23</span><span class="chapters-text">Adding 1x3 Header</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:11:50</span><span class="chapters-text">User LED</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:15:06</span><span class="chapters-text">Power LED</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:16:38</span><span class="chapters-text">Thank you for watching</span></li>
    </div>
    
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://oshwlab.com/robertferanec/custom-keyboard">Finished project (EasyEDA)</a></li>
            <li class="links-list-item"><a href="https://github.com/FEDEVEL/custom-keyboard">Github (HW + 3D + SW)</a></li>
            <li class="links-list-item"><a href="https://www.thingiverse.com/thing:6784228">Thingiverse (3D)</a></li>
            <li class="links-list-item"><a href="https://www.youtube.com/playlist?list=PLXvLToQzgzdftro2qK5In8p6ExsDFdpzw">Link to the complete playlist</a></li>
            <li class="links-list-item"><a href="https://fedevel.com/courses">FEDEVEL Online courses</a></li>
        </ul>
    </div>  
</div>

Tutorial - Custom DIY Keyboard Design and Build: Schematic + PCB + Case | Part 1 - RP2040

<div class="entry-content">
    <div class="jetpack-video-wrapper"><span class="embed-youtube" style="text-align:center; display: block;"><iframe src="https://www.youtube.com/embed/Lqc1jmbSxnE" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
Why is the thickness of PCB layers important? Explained.
    </div>

    <div class="blog-content-chapters">
        <div>
            Chapters:
        </div>
        <ul class="chapters-list">
            <li class="chapters-list-item"><span class="chapters-time">00:00</span><span class="chapters-text">What is this video about</span></li>
            <li class="chapters-list-item"><span class="chapters-time">00:36</span><span class="chapters-text">What is PCB stackup</span></li>
            <li class="chapters-list-item"><span class="chapters-time">01:08</span><span class="chapters-text">Is stackup important?</span></li>
            <li class="chapters-list-item"><span class="chapters-time">01:37</span><span class="chapters-text">Layer thickness vs. crosstalk</span></li>
            <li class="chapters-list-item"><span class="chapters-time">03:37</span><span class="chapters-text">Layer thickness vs. track width</span></li>
            <li class="chapters-list-item"><span class="chapters-time">05:11</span><span class="chapters-text">Layer count and order</span></li>
            <li class="chapters-list-item"><span class="chapters-time">07:44</span><span class="chapters-text">Conclusion</span></li>
    </div>
    
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://fedevel.com/courses">FEDEVEL Online courses</a></li>
        </ul>
    </div>  
</div>

How to choose PCB?

<div class="entry-content">
    <div class="blog-content">
        The x86 use often three chip solution, but it’s not a rule. Mobile platforms many time use only two chips. The chips used to be known as CPU (to support different CPU speeds and models), North Bridge (mostly memory interface + graphic interface or graphics), South Bridge (peripherals). These days manufacturers use different names such GMCH, SCH, PCH, … <br><br>

        <i>Picture: <a href="http://www.intel.com/p/en_US/embedded/hwsw/hardware/atom-n270/overview">Intel N270</a> (Three chips) / <a href="http://www.intel.com/p/en_US/embedded/hwsw/hardware/atom-z5xx/overview">Intel ATOM Z5xx</a> / <a href="http://ark.intel.com/Product.aspx?id=52213">Intel CORE i7</a></i>
    </div>

    <div class="blog-content-img-wrapper">
        <img src="https://assets.fedevel.com/blog/2019/10/9db6d-intel_n270_arch1.jpg" alt="Intel N270" />
    </div>
    <div class="blog-content-img-wrapper">
        <img src="https://assets.fedevel.com/blog/2019/10/0be04-intel_atom_arch1.jpg" alt="Intel ATOM Z5xx" />
    </div>
    <div class="blog-content-img-wrapper">
        <img src="https://assets.fedevel.com/blog/2019/10/0cb53-intel_i7_arch1.jpg" alt="Intel Core i7" />
    </div>

    <div class="blog-content-text">
       <b>Power sequencing</b><br>
       x86 boards support <a href="http://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface">several power states</a>. The most well know are:
       <ul class="content-list">
            <li class="content-list-item"><span class="content-text">S0 – Board is ON</span></li>
            <li class="content-list-item"><span class="content-text">S3 – Board is in Sleep (when you close your laptop, without shutting down)</span></li>
            <li class="content-list-item"><span class="content-text">S5 – Board is OFF, but can be switched pressing Power button</span></li>
            <li class="content-list-item"><span class="content-text">G3 – Disconnected from Main power</span></li>
        </ul>
        Power rails are split into several power domains: by voltage (+5V, +3.3V, …) and by power state (S0, S3, …). For example +3.3V rail is split into: +V3.3A (Always ON or also know as S5), +V3.3 (S3) and +V3.3S (S0).<br><br>

        More about power states: see <a href="http://www.acpi.info/DOWNLOADS/ACPIspec40a.pdf">ACPI specification</a><br><br>

        Power sequencing is controlled by South Bridge. Mobile platforms use a <a href="https://www.intelcommsalliance.com/kshowcase/view/view_item/4ddd1dbe78eb6b235cc4f07eabb79ae562ae690e">Embedded controller</a> instead. The embedded controller integrates often also other features – keyboard interface, volume control, ambient light sensor for automatic display backlight control, …
    </div>

    
    <div class="blog-content-text">
        <b>High Currents & High Heat</b><br>
        When designing a x86 board, it’s important to know how a lot of heat will be taken away. Power supplies are designed to support currents up to tens of Amps. PCB layout has to take this into consideration and wide tracks / planes + multiple VIAs are required for power tracks.
     </div>

     
    <div class="blog-content-text">
        <b>BIOS</b><br>
        BIOS development is one of the key parts of x86 board development. It’s done by BIOS companies (<a href="http://www.phoenix.com/">Phoenix</a> (Award), <a href="http://www.insydesw.com/home">Insyde</a>, … ) or by BIOS developers (they own a licence to source code of BIOS). Basic BIOS binaries are provided together with development platform, but must be customized based on the new board design. BIOS customization may easily cost around $900 per day.<br><br>

        Manufacturers of peripheral chips provide binaries for BIOS e.g Video BIOS, Ethernet BIOS (to support booting over Ethernet …), SATA BIOS (to support RAIDS …).<br><br>

        Open source BIOSes are also available – for example <a href="http://www.coreboot.org/Welcome_to_coreboot">Coreboot</a> (formerly known as LinuxBIOS)<br><br>

        A replacement for the older BIOS has been developed. The replacemnt is known as <a href="http://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface">UEFI</a> and is supported by several big manufacturers such Intel, AMD, IBM …
     </div>

     
    <div class="blog-content-text">
        <b>Booting</b><br>
        Initially, BIOS is executed directly from BIOS FLASH memory. Once system memory has been initialized (together with some other code),  the BIOS starts running from DDR.
     </div>

     
    <div class="blog-content-text">
        <b>BIOS Debugging</b><br>
        Before video interface is initialized, a serial console or JTAG can be used to debug BIOS. Standard BIOS diagnostic output is called <a href="http://www.postcodemaster.com/">POST code</a>. This code differentiate between manufacturers. BIOS POST code is a two/four digits hex value written by BIOS software on port 0x80. For easier diagnostic, this code can be read by <a href="http://www.google.sk/search?hl=en&client=firefox-a&hs=o0H&rls=org.mozilla%3Aen-GB%3Aofficial&biw=1440&bih=635&tbm=isch&sa=1&q=POST+Diagnostic+card&aq=f&aqi=g1&aql=&oq=">POST code diagnostic cards</a>.<br><br>

        Do you have any questions or you think something else is also important? Leave a comment.
     </div>

   
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="http://www.intel.com/p/en_US/embedded/hwsw/hardware/atom-n270/overview">Intel N270</a></li>
            <li class="links-list-item"><a href="http://www.intel.com/p/en_US/embedded/hwsw/hardware/atom-z5xx/overview">Intel ATOM Z5xx</a></li>
            <li class="links-list-item"><a href="http://ark.intel.com/Product.aspx?id=52213">Intel CORE i7</a></li>
            <li class="links-list-item"><a href="http://en.wikipedia.org/wiki/Advanced_Configuration_and_Power_Interface">Several power states</a></li>
            <li class="links-list-item"><a href="http://www.acpi.info/DOWNLOADS/ACPIspec40a.pdf">ACPI specification</a></li>
            <li class="links-list-item"><a href="https://www.intelcommsalliance.com/kshowcase/view/view_item/4ddd1dbe78eb6b235cc4f07eabb79ae562ae690e">Embedded controller</a></li>
            <li class="links-list-item"><a href="http://www.phoenix.com/">Phoenix</a></li>
            <li class="links-list-item"><a href="http://www.insydesw.com/home">Insyde</a></li>
            <li class="links-list-item"><a href="http://www.coreboot.org/Welcome_to_coreboot">Coreboot</a></li>
            <li class="links-list-item"><a href="http://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface">UEFI</a></li>
            <li class="links-list-item"><a href="http://www.postcodemaster.com/">POST code</a></li>
            <li class="links-list-item"><a href="http://www.google.sk/search?hl=en&client=firefox-a&hs=o0H&rls=org.mozilla%3Aen-GB%3Aofficial&biw=1440&bih=635&tbm=isch&sa=1&q=POST+Diagnostic+card&aq=f&aqi=g1&aql=&oq=">POST code diagnostic cards</a></li>
        </ul>
    </div>  
</div>

x86 Hardware design – What everyone should know

<div class="entry-content">
    <div class="blog-content">
        The best high speed design tutorial for PCB layout in Altium Designer what I have found. It’s worth to have a look.<br><br>

        <i><b>High-Speed Digital Board Design with Altium Designer</b> by Istvan Nagy, Electronics Design Engineer, Blue Chip Technology. (<a href="https://assets.fedevel.com/blog/downloads/HiSpeedDesignTutorialforAltiumDesigner.pdf" target="_blank">download pdf here</a>)<br><br>

        Picture: A page from the tutorial</i>
    </div>

    <div class="blog-content-img-wrapper">
        <img src="https://assets.fedevel.com/blog/2019/10/0c528-altium_designer_high_speed_tutorial.jpg" alt="altium_designer_high_speed_tutorial" />
    </div>

   
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://assets.fedevel.com/blog/downloads/HiSpeedDesignTutorialforAltiumDesigner.pdf" target="_blank">High-Speed Digital Board Design with Altium Designer - PDF file</a></li>
        </ul>
    </div>  
</div>

Altium Designer – High Speed Design Tutorial

<div class="entry-content">
    <div class="jetpack-video-wrapper"><span class="embed-youtube" style="text-align:center; display: block;"><iframe src="https://www.youtube.com/embed/IFLviz722ws" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>

    <div class="blog-content">
        This video tutorial shows how I use micro VIA and  blind VIA in Altium Designer during PCB layout (HDI PCB Technology).
    </div>

    <div class="jetpack-video-wrapper"><span class="embed-youtube" style="text-align:center; display: block;"><iframe src="https://www.youtube.com/embed/OaefGeQrRkA" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>



    <div class="blog-content-text">
       <b><span style="color:#ff0000;">Updated:</span></b> Have a look also on the following video created
            by <a href="http://www.youtube.com/user/elektroniskorg">Elektroniskorg</a>. The video explains how to configure
            Altium Designer Rules for automatic VIA selection during interactive routing. Thank you for a great tutorial.
    </div>

   
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="http://www.youtube.com/user/elektroniskorg">Elektroniskorg</a></li>
        </ul>
    </div>  
</div>

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Altium Designer – Using uVIAs and Buried VIAs in PCB layout

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Tutorial - Custom DIY Keyboard Design and Build | Part 2: Keyboard Schematic

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How to choose PCB?

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