<p><span class="h-card" translate="no"><a href="https://chaos.social/@gsuberland" class="u-url mention">@<span>gsuberland</span></a></span> Fair enough.</p><p>I normally work on designs where I spend a month or more of spare time on schematic and layout, put several hundred dollars at *least* of parts on it, then months on firmware.</p><p>The board needs to just work, so I&#39;m going to do everything I possibly can to tip the odds in my favor and minimize the chance of needing a respin because of something stupid.</p>

<p><span class="h-card" translate="no"><a href="https://ioc.exchange/@azonenberg" class="u-url mention">@<span>azonenberg</span></a></span> I personally don&#39;t mind working around these issues because it&#39;s soooooo cheap. More than enough to be the difference between me doing a design and not doing it.</p>

<p><span class="h-card" translate="no"><a href="https://chaos.social/@gsuberland" class="u-url mention">@<span>gsuberland</span></a></span> This kind of thing is why I haven&#39;t been a fan of JLC and similar places except for cheap &quot;I don&#39;t care about quality or performance&quot; stuff.</p><p>I&#39;d rather give the fab a full material spec and stackup and have them either use it or tell me they can&#39;t do it.</p>

<p>I&#39;ve noted this flaw in the question and asked them to add a feature where it warns you about this issue.</p><p>They won&#39;t do Tg135-140 for 8L, only Tg155, so it&#39;s correct there.</p><p>For 10L and up they use S1000-2M instead, which they refer to as Tg170 (it&#39;s actually Tg180 according to the datasheet, so I&#39;ve posted another question about that discrepancy), and their impedance calculations correctly assume that material, so the issue is avoided here. It&#39;s only the 4L and 6L boards that are affected.</p>

<p><span class="h-card" translate="no"><a href="https://donotsta.re/users/mwk" class="u-url mention">@<span>mwk</span></a></span> was it a private key</p>

<p>also trying to fix some gaps like them not publishing what material they use for Tg135-140 dielectric. this relates to a huge gotcha in their quote system, where Nan Ya Plastics NP-155F is the material they assume for impedance control but FR-4 Tg135-140 is the default material for 4 and 6 layer boards *regardless* of whether you select an impedance controlled stackup. it doesn&#39;t switch it for you. if you don&#39;t select Tg150 manually, the impedance will be wrong on the manufactured board.</p>

<p>fixing JLC&#39;s docs by asking questions whose correct answers contradict errors in their docs</p>

<p><span class="h-card" translate="no"><a href="https://infosec.exchange/@stacksmashing" class="u-url mention">@<span>stacksmashing</span></a></span> is that a TI part that&#39;s a successor to TPS65983B?</p>

<p><span class="h-card" translate="no"><a href="https://mastodon.social/@endospore" class="u-url mention">@<span>endospore</span></a></span> <span class="h-card" translate="no"><a href="https://toot.cat/@zeenix" class="u-url mention">@<span>zeenix</span></a></span> (as a language designer, I disagree. the terms you choose are a part of the overall experience of using your language, and we don&#39;t use &quot;cmon it&#39;s just a feature&quot; to justify something people routinely have a hard time with; we try to improve on it. it is completely reasonable to expect Rust to improve on this, too)</p>