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#openems

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niconiconi<p>Simulating SMA connectors... <a href="https://mk.absturztau.be/tags/electronics" rel="nofollow noopener" target="_blank">#electronics</a> <a href="https://mk.absturztau.be/tags/openEMS" rel="nofollow noopener" target="_blank">#openEMS</a></p>
niconiconi<p>Simulating a coax cable in cylindrical coordinates has a funny problem. The mesh cell becomes progressively smaller in area or volume at you move closer to the singular origin, which is the region where the center conductor is located. So you spend an absolutely ridiculous amount of CPU cycles to calculate nothingness - there's no electric field inside a conductor ​:blobcatfacepalm:​ openEMS has a special "multigrid" mode to solve this problem. When it's enabled, it skips every other radial mesh line within the specified radius, and can be applied recursively too. <a href="https://mk.absturztau.be/tags/electronics" rel="nofollow noopener" target="_blank">#electronics</a> <a href="https://mk.absturztau.be/tags/openEMS" rel="nofollow noopener" target="_blank">#openEMS</a></p>
niconiconi<p>/me Trying to understand how to run <a href="https://mk.absturztau.be/tags/openEMS" rel="nofollow noopener" target="_blank">#openEMS</a> full-wave simulations in cylindrical coordinates instead. <a href="https://mk.absturztau.be/tags/electronics" rel="nofollow noopener" target="_blank">#electronics</a></p>
hufnagel 🏳️‍🌈 🐧🔆<p><span class="h-card" translate="no"><a href="https://fediworld.de/@crazy2bike" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>crazy2bike</span></a></span> <br>Hi, ist Goodwe nur der WR, und was sitzt denn da noch für ein Management System drauf für den Speicher? Oder macht der das mit?<br>Ich bastel nämlich grad an ähnlichen Themen mit <a href="https://mastodon.de/tags/fenecon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fenecon</span></a> / <a href="https://mastodon.de/tags/openems" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openems</span></a> was die Datenpunkte angeht. <br>Doku ist eher überschaubar 😳</p>
Chris Gammell<p>Do you understand how <a href="https://chaos.social/tags/RF" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RF</span></a> and <a href="https://chaos.social/tags/magnetics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>magnetics</span></a> work? Any time I check out Sam Aldhaher's visualizations, I do just a bit better. We spoke on The Amp Hour this week about how to get started in <a href="https://chaos.social/tags/blender" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>blender</span></a> and build out visualizations using tools like <a href="https://chaos.social/tags/openems" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openems</span></a> and <a href="https://chaos.social/tags/elmer_fem" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>elmer_fem</span></a>. </p><p><a href="https://theamphour.com/695-making-the-invisible-visible-with-sam-aldahar/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">theamphour.com/695-making-the-</span><span class="invisible">invisible-visible-with-sam-aldahar/</span></a> </p><p>This episode was similar to the one I recorded with Katerina Galitskaya last year, who also does amazing visualizations. It's just SO useful to have people explaining RF with math and 3D models!</p>
niconiconi<p><a href="https://mk.absturztau.be/tags/openEMS" rel="nofollow noopener" target="_blank">#openEMS</a> simulation of 0402 AC-coupling capacitor parasitics. On a 4-layer board, with 0.2 mm from signal layer to plane. Interestingly, the parasitic capacitance of the mounting pads and the parasitic inductance of the capacitor forms an accidental matching network and compensated each other in this stackup, making it usable even at 20 GHz! You can see similar results without a full-wave solver in lumped circuit simulators, by modeling the mounting pads as two short microstrips, and inserting an 0.1 - 0.2 nH ESL in series. But I won't trust this result unless I can borrow a 20 GHz VNA somewhere, since it's extremely sensitive to parasitic modeling. Also, the magical effect disappears for a better 0.1 mm dielectric, often preferred for lower loop area and lower crosstalks. <a href="https://mk.absturztau.be/tags/electronics" rel="nofollow noopener" target="_blank">#electronics</a></p>
niconiconi<p>Wrote more <a href="https://mk.absturztau.be/tags/openEMS" rel="nofollow noopener" target="_blank">#openEMS</a> documentation, answering questions like: Why does Plasma Frequency have anything to do with simulating a circuit board? <a href="https://mk.absturztau.be/tags/electronics" rel="nofollow noopener" target="_blank">#electronics</a></p>
niconiconi<p>My first draft of the <a href="https://mk.absturztau.be/tags/openEMS" rel="nofollow noopener" target="_blank">#openEMS</a> tutorial <i>First Lessons For Circuit Designers</i> is now public. <a href="https://fasterems.github.io/openEMS-Project/python/openEMS/Tutorials/First_Lessons.html" rel="nofollow noopener" target="_blank">https://fasterems.github.io/openEMS-Project/python/openEMS/Tutorials/First_Lessons.html</a> <a href="https://mk.absturztau.be/tags/electronics" rel="nofollow noopener" target="_blank">#electronics</a></p>
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