<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/nMwamrZE_rc" 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">00:39</span><span class="chapters-text">Mounting holes</span></li>
            <li class="chapters-list-item"><span class="chapters-time">02:12</span><span class="chapters-text">USB-C connector</span></li>
            <li class="chapters-list-item"><span class="chapters-time">03:50</span><span class="chapters-text">Drawing board shape</span></li>
            <li class="chapters-list-item"><span class="chapters-time">06:27</span><span class="chapters-text">Rotary encoders</span></li>
            <li class="chapters-list-item"><span class="chapters-time">07:11</span><span class="chapters-text">Buttons</span></li>
            <li class="chapters-list-item"><span class="chapters-time">09:22</span><span class="chapters-text">Sockets</span></li>
            <li class="chapters-list-item"><span class="chapters-time">10:40</span><span class="chapters-text">LEDs under buttons</span></li>
            <li class="chapters-list-item"><span class="chapters-time">12:44</span><span class="chapters-text">Metal plate holders</span></li>
            <li class="chapters-list-item"><span class="chapters-time">13:49</span><span class="chapters-text">RP2040</span></li>
            <li class="chapters-list-item"><span class="chapters-time">14:48</span><span class="chapters-text">USER and Power LEDs</span></li>
            <li class="chapters-list-item"><span class="chapters-time">17:44</span><span class="chapters-text">Debug header</span></li>
            <li class="chapters-list-item"><span class="chapters-time">18:01</span><span class="chapters-text">Set Net and Layer colors</span></li>
            <li class="chapters-list-item"><span class="chapters-time">19:29</span><span class="chapters-text">Decoupling capacitors around MCU</span></li>
            <li class="chapters-list-item"><span class="chapters-time">24:15</span><span class="chapters-text">USB resistors</span></li>
            <li class="chapters-list-item"><span class="chapters-time">25:00</span><span class="chapters-text">Crystal circuit</span></li>
            <li class="chapters-list-item"><span class="chapters-time">27:00</span><span class="chapters-text">Series termination resistors</span></li>
            <li class="chapters-list-item"><span class="chapters-time">28:30</span><span class="chapters-text">Filters</span></li>
            <li class="chapters-list-item"><span class="chapters-time">30:40</span><span class="chapters-text">Flash</span></li>
            <li class="chapters-list-item"><span class="chapters-time">31:27</span><span class="chapters-text">Reset button + schematic update</span></li>
            <li class="chapters-list-item"><span class="chapters-time">34:06</span><span class="chapters-text">Boot button and circuit update</span></li>
            <li class="chapters-list-item"><span class="chapters-time">35:53</span><span class="chapters-text">Components around USB-C connector</span></li>
            <li class="chapters-list-item"><span class="chapters-time">38:09</span><span class="chapters-text">Power for LEDs</span></li>
            <li class="chapters-list-item"><span class="chapters-time">38:46</span><span class="chapters-text">Voltage regulator</span></li>
            <li class="chapters-list-item"><span class="chapters-time">39:52</span><span class="chapters-text">LED resistors</span></li>
            <li class="chapters-list-item"><span class="chapters-time">41:08</span><span class="chapters-text">Level translator</span></li>
            <li class="chapters-list-item"><span class="chapters-time">41:59</span><span class="chapters-text">Diodes</span></li>
            <li class="chapters-list-item"><span class="chapters-time">44:37</span><span class="chapters-text">Components around encoders</span></li>
            <li class="chapters-list-item"><span class="chapters-time">49:26</span><span class="chapters-text">Decoupling capacitors for LEDs</span></li>
            <li class="chapters-list-item"><span class="chapters-time">51:46</span><span class="chapters-text">Double check position of components</span></li>
            <li class="chapters-list-item"><span class="chapters-time">53:27</span><span class="chapters-text">Placement finished</span></li>
            <li class="chapters-list-item"><span class="chapters-time">54:14</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 | Part 3: PCB - Component Placement

<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-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">00:16</span><span class="chapters-text">Adding socket for switch</span></li>
            <li class="chapters-list-item"><span class="chapters-time">09:23</span><span class="chapters-text">Adding switch</span></li>
            <li class="chapters-list-item"><span class="chapters-time">19:21</span><span class="chapters-text">Adding diode</span></li>
            <li class="chapters-list-item"><span class="chapters-time">20:48</span><span class="chapters-text">Connecting keyboard matrix</span></li>
            <li class="chapters-list-item"><span class="chapters-time">35:05</span><span class="chapters-text">Adding rotary encoder</span></li>
            <li class="chapters-list-item"><span class="chapters-time">42:21</span><span class="chapters-text">Connecting encoder</span></li>
            <li class="chapters-list-item"><span class="chapters-time">44:26</span><span class="chapters-text">Adding 10nF capacitor</span></li>
            <li class="chapters-list-item"><span class="chapters-time">56:39</span><span class="chapters-text">Adding and connecting LEDs</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:03:46</span><span class="chapters-text">Adding buffer</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:08:03</span><span class="chapters-text">Connecting LED power and adding 0.1R</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:10:28</span><span class="chapters-text">Adding RGB LED</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:18:53</span><span class="chapters-text">Adding mounting holes</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:24:37</span><span class="chapters-text">Adding stand off</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:36:54</span><span class="chapters-text">Annotate schematic</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:41:03</span><span class="chapters-text">Importing schematic to PCB</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:42:21</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://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/Hfzq1QES-Q" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        Some tips for when designing hardware and PCBs with simple RF sections and components. These concepts have aided me well when designing 4-layer embedded systems PCBs.<br><br>Topics: critical trace lengths, stackups, controlled impedance traces (microstrip, stripline), impedance discontinuities due to wide pads, clearances, bias tees.
    </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">Introduction</span></li>
            <li class="chapters-list-item"><span class="chapters-time">00:53</span><span class="chapters-text">Overview</span></li>
            <li class="chapters-list-item"><span class="chapters-time">02:08</span><span class="chapters-text">Critical length</span></li>
            <li class="chapters-list-item"><span class="chapters-time">06:45</span><span class="chapters-text">Stackup</span></li>
            <li class="chapters-list-item"><span class="chapters-time">08:51</span><span class="chapters-text">Controlled impedance traces</span></li>
            <li class="chapters-list-item"><span class="chapters-time">12:34</span><span class="chapters-text">Impedance discontinuities (pad-to-trace)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">14:34</span><span class="chapters-text">Clearance</span></li>
            <li class="chapters-list-item"><span class="chapters-time">15:17</span><span class="chapters-text">Antenna bias tees</span></li>
        </ul>
    </div>
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://open-seneca.org">Open Seneca</a></li>

            <li class="links-list-item"><a href="https://fedevel.com/courses">FEDEVEL courses</a></li>
        </ul>
    </div>  
</div>

Practical RF Hardware and PCB Design Tips - Phil's Lab #19

<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/5EeQPxRdurk" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        The best crosstalk explanation I have ever seen. What do you think? Thank you Eric Bogatin.
    </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">Intro</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">06:56</span><span class="chapters-text">Microstrip</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">08:49</span><span class="chapters-text">Adding another signal line</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">16:13</span><span class="chapters-text">Im wrong</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">21:55</span><span class="chapters-text">Near and far end crosstalk</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">26:38</span><span class="chapters-text">Higher voltage currents</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">28:40</span><span class="chapters-text">Increasing current impedance</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">33:18</span><span class="chapters-text">Comparing reflections</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">35:30</span><span class="chapters-text">Frequency of ringing</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">37:18</span><span class="chapters-text">Microstrip crosstalk</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">38:31</span><span class="chapters-text">Derivative crosstalk</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">39:26</span><span class="chapters-text">What is impedance value of the driver</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">42:17</span><span class="chapters-text">Moving the traces farther apart</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">43:35</span><span class="chapters-text">Near and crosstalk coefficient</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">44:40</span><span class="chapters-text">Simulator</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">45:09</span><span class="chapters-text">Field solver</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">45:24</span><span class="chapters-text">Measuring crosstalk</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">48:38</span><span class="chapters-text">Teledyne</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">52:00</span><span class="chapters-text">The Scale</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">52:33</span><span class="chapters-text">Rise Time</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">52:49</span><span class="chapters-text">Measuring the Scope</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">55:13</span><span class="chapters-text">Why is it a little longer</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">56:08</span><span class="chapters-text">Nearend crosstalk</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">56:38</span><span class="chapters-text">Termination</span>
            </li>
            <li class="chapters-list-item">
                <span class="chapters-time">58:53</span><span class="chapters-text">Expanding the timebase</span>
            </li>
        </ul>
    </div> 
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://www.linkedin.com/in/eric-bogatin-368860/">Eric Bogatin</a></li>
            <li class="links-list-item"><a href="https://www.bethesignal.com/bogatin/">Eric's courses</a></li>
        </ul>
    </div>   
</div>


Understanding Crosstalk in PCB Layout – You may wish you knew this before (with Eric Bogatin)

<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/aySAg50S1E8" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        Do you know what a nibble in DDR memory design is?
    </div>
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://www.fedevel.com/welldoneblog/wp-content/uploads/2014/06/IMX6DQ6SDLHDG.pdf">iMX6 DDR3 Design Guide</a></li>
            <li class="links-list-item"><a href="https://www.nxp.com/files-static/32bit/doc/app_note/AN5097.pdf?&fasp=1&WT_TYPE=Application+Notes&WT_VENDOR=FREESCALE&WT_FILE_FORMAT=pdf&WT_ASSET=Documentation&fileExt=.pdf">DDR4 Layout Design PDF</a></li>
            <li class="links-list-item"><a href="https://semiconductor.samsung.com/resources/device-operation-timing-diagram/DDR4_Device_Operations_Rev11_Oct_14-0.pdf">DDR Commands PDF</a></li>
            <li class="links-list-item"><a href="https://welldoneblog.fedevel.com/2011/06/15/ddr3-memory-chip-mirroring-pcb-layout/">DDR Mirroring</a></li>
            <li class="links-list-item"><a href="https://www.compuram.biz/documents/datasheet/519203ds_ddr2_1gb_f-die_based_rdimm_rev10.pdf">Memory Module PDF</a></li>
        </ul>
    </div>   
</div>


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Tutorial - Custom DIY Keyboard Design and Build | Part 3: PCB - Component Placement

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

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