<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/YzBtfN1LQtM" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span></div><div class="blog-content"> I challenged a software engineer to design his very first PCB. What happened?</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">The challenge</span></li><li class="chapters-list-item"><span class="chapters-time">01:01</span><span class="chapters-text">Schematic page</span></li><li class="chapters-list-item"><span class="chapters-time">03:46</span><span class="chapters-text">STM32</span></li><li class="chapters-list-item"><span class="chapters-time">10:18</span><span class="chapters-text">Power</span></li><li class="chapters-list-item"><span class="chapters-time">21:50</span><span class="chapters-text">Power LED</span></li><li class="chapters-list-item"><span class="chapters-time">23:29</span><span class="chapters-text">Boot and Reset</span></li><li class="chapters-list-item"><span class="chapters-time">27:47</span><span class="chapters-text">Crystal</span></li><li class="chapters-list-item"><span class="chapters-time">30:58</span><span class="chapters-text">USB</span></li><li class="chapters-list-item"><span class="chapters-time">33:59</span><span class="chapters-text">Arduino headers and User LED</span></li><li class="chapters-list-item"><span class="chapters-time">36:49</span><span class="chapters-text">SWI and UART connectors</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>

Is this really how beginners design boards??? | Schematic Review

<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/sKOUOU-hVEs" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
This video will help you to understand eye diagrams. Thank you very much Tim Wang Lee
    </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">00:17</span><span class="chapters-text">How eye diagram is created and why it´s useful</span></li>
            <li class="chapters-list-item"><span class="chapters-time">07:35</span><span class="chapters-text">How reflections influence eye diagram shape</span></li>
            <li class="chapters-list-item"><span class="chapters-time">12:17</span><span class="chapters-text">Simulating reflections and checking eye diagram</span></li>
            <li class="chapters-list-item"><span class="chapters-time">20:19</span><span class="chapters-text">How crosstalk influences eye diagram shape</span></li>
            <li class="chapters-list-item"><span class="chapters-time">30:36</span><span class="chapters-text">Simulating crosstalk and checking eye diagram</span></li>
            <li class="chapters-list-item"><span class="chapters-time">35:09</span><span class="chapters-text">How loss influences eye diagram shape</span></li>
            <li class="chapters-list-item"><span class="chapters-time">41:13</span><span class="chapters-text">Simulating loss and checking eye diagram</span></li>
            <li class="chapters-list-item"><span class="chapters-time">50:32</span><span class="chapters-text">Equalization explained</span></li>
            <li class="chapters-list-item"><span class="chapters-time">57:53</span><span class="chapters-text">CTLE Equalization</span></li>
            <li class="chapters-list-item"><span class="chapters-time">58:49</span><span class="chapters-text">FFE Equalization</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:02:19</span><span class="chapters-text">DFE Equalization</span></li>
    </div>
    
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="http://www.keysight.com/find/ads-si-workshop">Learn more about Signal Integrity with ADS</a></li>
            <li class="links-list-item"><a href="https://www.keysight.com/us/en/products/software/pathwave-design-software.html">Get a head start with Electronic Design Automation</a></li>
            <li class="links-list-item"><a href="https://www.linkedin.com/in/timwanglee/">Connect with Tim</a></li>
            <li class="links-list-item"><a href="https://fedevel.com/courses">FEDEVEL Online courses</a></li>
        </ul>
    </div>  
</div>

What does an eye diagram show? Here is how you recognize problems - reflections, crosstalk and loss

<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/Rr9NBtrA4t4" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        Watch how differential pair signals are travelling through a PCB. Thank you very much Yuriy Shlepnev 
    </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">00:33</span><span class="chapters-text">Differential pairs routed on top / bottom, THIN PCB, 1W</span></li>
            <li class="chapters-list-item"><span class="chapters-time">12:56</span><span class="chapters-text">3W, Top / Bottom</span></li>
            <li class="chapters-list-item"><span class="chapters-time">17:17</span><span class="chapters-text">THICK PCB, Top / Bottom</span></li>
            <li class="chapters-list-item"><span class="chapters-time">23:49</span><span class="chapters-text">No GND plane</span></li>
            <li class="chapters-list-item"><span class="chapters-time">30:01</span><span class="chapters-text">Differential pairs inside of PCB</span></li>
            <li class="chapters-list-item"><span class="chapters-time">45:30</span><span class="chapters-text">3D animation, top/bottom, 1W</span></li>
            <li class="chapters-list-item"><span class="chapters-time">48:51</span><span class="chapters-text">3D animation, top/bottom, 3W</span></li>
            <li class="chapters-list-item"><span class="chapters-time">57:12</span><span class="chapters-text">3D animation, inside of PCB, 1W</span></li>
            <li class="chapters-list-item"><span class="chapters-time">58:40</span><span class="chapters-text">3D animation, inside of PCB, 3W</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:06:21</span><span class="chapters-text">Crosstalk examples</span></li>
    </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/yuriy-shlepnev-7b39136/">Yuriy's LinkedIn</a></li>
            <li class="links-list-item"><a href="https://www.simberian.com/">Yuriy's company</a></li>
            <li class="links-list-item"><a href="https://fedevel.com/courses">FEDEVEL Online courses</a></li>
        </ul>
    </div>  
</div>

Watch Differential Pair Fields and Currents in PCB

<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/Tt8X6_maj6c" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        When capacitor is an inductor …
    </div>
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://youtu.be/5Ca0Eah7eKI">Part 1: PCB Layout & Decoupling - Explained why it´s so complicated</a></li>
            <li class="links-list-item"><a href="https://youtu.be/Tt8X6_maj6c">Part 2: PCB Layout & Decoupling - Understanding Impedance</a></li>
            <li class="links-list-item"><a href="https://youtu.be/hZSOhVdzqZk">Part 3: PCB Layout & Decoupling - Measuring and Fixing</a></li>
            <li class="links-list-item"><a href="https://www.wikihow.com/Calculate-Impedance">Calculating Impedance Webpage</a></li>
            <li class="links-list-item"><a href="https://youtu.be/YLGrugmDvc0">Series Resonance in RLC Circuit</a></li>
        </ul>
    </div>   
</div>


PCB Layout & Decoupling – Understanding Impedance (Part 2)

<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/C7-8nUU6e3E" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        Entire step-by-step PCB design process going through the schematic, layout, and routing of a 'barebones' STM32F4-based PCB including USB and a buck converter in KiCAD. All the way from schematic creation, through to four-layer PCB layout and routing, as well as sending it off for manufacture and assembly via JLCPCB.<br><br>

This is an update from the original 'KiCad STM32 Hardware Design' video, including some additional tips and tricks, as well as a show of various assembled boards made by JLCPCB. Hopefully with much improved audio quality!
    </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">00:14</span><span class="chapters-text">Topics covered</span></li>
            <li class="chapters-list-item"><span class="chapters-time">00:31</span><span class="chapters-text">JLCPCB assembly showcase</span></li>
            <li class="chapters-list-item"><span class="chapters-time">00:58</span><span class="chapters-text">Parts used in design (JLCPB parts library)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">03:28</span><span class="chapters-text">STM32 pin assignment in STM32CubeMX</span></li>
        </ul>
        <div>
            Chapters schematic:
        </div>
        <ul class="chapters-list">
            <li class="chapters-list-item"><span class="chapters-time">09:43</span><span class="chapters-text">KiCad project and schematic</span></li>
            <li class="chapters-list-item"><span class="chapters-time">10:06</span><span class="chapters-text">Schematic page settings</span></li>
            <li class="chapters-list-item"><span class="chapters-time">10:53</span><span class="chapters-text">Adding STM32F405 to schematic</span></li>
            <li class="chapters-list-item"><span class="chapters-time">12:10</span><span class="chapters-text">STM32 power pins</span></li>
            <li class="chapters-list-item"><span class="chapters-time">14:14</span><span class="chapters-text">Labelling pins/global labels</span></li>
            <li class="chapters-list-item"><span class="chapters-time">14:57</span><span class="chapters-text">VCAP pins</span></li>
            <li class="chapters-list-item"><span class="chapters-time">16:37</span><span class="chapters-text">NRST and BOOT0 pins, Bootmodes</span></li>
            <li class="chapters-list-item"><span class="chapters-time">20:24</span><span class="chapters-text">Transferring assignments from CubeMX to KiCad</span></li>
            <li class="chapters-list-item"><span class="chapters-time">23:58</span><span class="chapters-text">'No connect' flags</span></li>
            <li class="chapters-list-item"><span class="chapters-time">24:48</span><span class="chapters-text">Decoupling capacitors</span></li>
            <li class="chapters-list-item"><span class="chapters-time">26:10</span><span class="chapters-text">VDDA pin decoupling</span></li>
            <li class="chapters-list-item"><span class="chapters-time">27:54</span><span class="chapters-text">Crystal circuitry (HSE)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">37:15</span><span class="chapters-text">LED and current limiting resistor</span></li>
            <li class="chapters-list-item"><span class="chapters-time">39:26</span><span class="chapters-text">Buck converter circuitry (+ fusing, reverse polarity protection)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">56:15</span><span class="chapters-text">Connectors (SWD, I2C, UART)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:02:40</span><span class="chapters-text">USB</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:11:09</span><span class="chapters-text">Electrical rules checker (ERC)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:12:55</span><span class="chapters-text">Mounting holes</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:13:45</span><span class="chapters-text">Assigning footprints to symbols</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:24:36</span><span class="chapters-text">Generating the netlist</span></li>
        </ul>
        <div>
            Chapters layout:
        </div>
        <ul class="chapters-list">
            <li class="chapters-list-item"><span class="chapters-time">1:24:55</span><span class="chapters-text">Choosing the number of PCB layers</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:26:11</span><span class="chapters-text">Design rules</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:27:26</span><span class="chapters-text">Rough layout (section by section)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:35:09</span><span class="chapters-text">Improving the layout, finer details</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:53:17</span><span class="chapters-text">Mounting hole placement</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:55:10</span><span class="chapters-text">Board outline and rounded corners</span></li>
            <li class="chapters-list-item"><span class="chapters-time">1:57:40</span><span class="chapters-text">Rearranging connectors</span></li>
        </ul>
        <div>
            Chapters routing:
        </div>
        <ul class="chapters-list">
            <li class="chapters-list-item"><span class="chapters-time">2:00:19</span><span class="chapters-text">Adding track widths</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:00:55</span><span class="chapters-text">Power and ground planes (copper pours)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:03:10</span><span class="chapters-text">STM32 routing (critical items first)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:04:41</span><span class="chapters-text">Tombstoning</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:05:55</span><span class="chapters-text">Track spacing</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:08:49</span><span class="chapters-text">Buck converter routing</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:10:00</span><span class="chapters-text">Track width calculator</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:12:39</span><span class="chapters-text">USB controlled impedance differential traces</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:13:08</span><span class="chapters-text">JLCPCB impedance calculator</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:16:09</span><span class="chapters-text">Connecting GND and 3V3 (with vias to internal copper pours)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:28:00</span><span class="chapters-text">Design rules check (DRC)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:28:50</span><span class="chapters-text">Silkscreen (labelling, pin 1 indication, polarity indication)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:36:10</span><span class="chapters-text">Importing custom graphics as silkscreen</span></li>
        </ul>
        <div>
            Chapters manufacturing and assembly:
        </div>
        <ul class="chapters-list">
            <li class="chapters-list-item"><span class="chapters-time">2:36:55</span><span class="chapters-text">Hiding JLCPCB order number</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:37:42</span><span class="chapters-text">Adding tooling holes for assembly</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:39:10</span><span class="chapters-text">Generating Gerber and drill files</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:40:27</span><span class="chapters-text">Footprint position file</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:41:34</span><span class="chapters-text">Bill of materials (BOM) and assigning part numbers (LCSC)</span></li>
            <li class="chapters-list-item"><span class="chapters-time">2:44:32</span><span class="chapters-text">Ordering PCBs via JLCPCB with assembly</span></li>
        </ul>
    </div>
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://github.com/pms67/STM32F4-Reference-PCB">Github - pms67/STM32F4-Reference-PCB</a></li>

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

KiCad STM32 + USB + Buck Converter PCB Design and JLCPCB Assembly (Update) - Phil's Lab #11

<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/4nEd1jTTIUQ" class="youtube-player" width="740" height="416.418" frameborder="0" allowfullscreen></iframe></span>
    </div>
    <div class="blog-content">
        I always wanted to see if for higher frequencies currents really flow under signals. And, here it is …
    </div>
    <div class="blog-content-links">
        <div>
            Links:
        </div>
        <ul class="links-list">
            <li class="links-list-item"><a href="https://github.com/FEDEVEL/youtube-current-return-path">Download Altium & Simulation files</a></li>
        </ul>
    </div>   
</div>


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Is this really how beginners design boards??? | Schematic Review

What does an eye diagram show? Here is how you recognize problems - reflections, crosstalk and loss

Watch Differential Pair Fields and Currents in PCB

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