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<!doctype html><html lang=en><head><title>Self-built UV exposure unit (LED) :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="If you’ve been around the (electronics) DIY scene for a while, at some point you can’t avoid circuit boards (printed circuit boards/PCBs). The main advantages over soldering circuits by hand on perforated or strip-grid boards are that they are easier to replicate (once designed a circuit can theoretically be produced as often as you like) and that space can be used more efficiently (a board is almost always smaller than a soldered perforated grid board with the same circuit). Ultimately, devices with circuit boards also simply look more professional. There are certainly more advantages (and of course also disadvantages!), but I will not list them here for the sake of simplicity.
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"><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/><link rel=stylesheet href=https://blog.privacynerd.de/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css><link rel=stylesheet href=https://blog.privacynerd.de/css/code.min.d529ea4b2fb8d34328d7d31afc5466d5f7bc2f0bc9abdd98b69385335d7baee4.css><link rel=stylesheet href=https://blog.privacynerd.de/css/fonts.min.5bb7ed13e1d00d8ff39ea84af26737007eb5051b157b86fc24487c94f3dc8bbe.css><link rel=stylesheet href=https://blog.privacynerd.de/css/footer.min.eb8dfc2c6a7eafa36cd3ba92d63e69e849e2200e0002a228d137f236b09ecd75.css><link rel=stylesheet href=https://blog.privacynerd.de/css/gist.min.a751e8b0abe1ba8bc53ced52a38b19d8950fe78ca29454ea8c2595cf26aad5c0.css><link rel=stylesheet href=https://blog.privacynerd.de/css/header.min.75c7eb0e2872d95ff48109c6647d0223a38db52e2561dd87966eb5fc7c6bdac6.css><link rel=stylesheet href=https://blog.privacynerd.de/css/main.min.1d90a993d506516707eea93a3ab2638e4e9f92eb2c6b3aa1a4f08f8f9fa0648e.css><link rel=stylesheet href=https://blog.privacynerd.de/css/menu.min.3c17467ebeb3d38663dce68f71f519901124fa5cbb4519b2fb0667a21e9aca39.css><link rel=stylesheet href=https://blog.privacynerd.de/css/pagination.min.bbb986dbce00a5ce5aca0504b7925fc1c581992a4bf57f163e5d69cc1db7d836.css><link rel=stylesheet href=https://blog.privacynerd.de/css/post.min.e6dddd258e64c83e05cec0cd49c05216742d42fc8ecbfbe6b67083412b609bd3.css><link rel=stylesheet href=https://blog.privacynerd.de/css/syntax.min.a0773cce9310cb6d8ed23e50f005448facf29a53001b57e038828daa466b25c0.css><link rel=stylesheet href=https://blog.privacynerd.de/css/terminal.min.e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css><link rel=stylesheet href=https://blog.privacynerd.de/css/terms.min.b81791663c3790e738e571cdbf802312390d30e4b1d8dc9d814a5b5454d0ac11.css><link rel=stylesheet href=https://blog.privacynerd.de/terminal.css><link rel="shortcut icon" href=https://blog.privacynerd.de/favicon.png><link rel=apple-touch-icon href=https://blog.privacynerd.de/apple-touch-icon.png><meta name=twitter:card content="summary"><meta name=twitter:site content><meta name=twitter:creator content><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="Self-built UV exposure unit (LED)"><meta property="og:description" content="If you’ve been around the (electronics) DIY scene for a while, at some point you can’t avoid circuit boards (printed circuit boards/PCBs). The main advantages over soldering circuits by hand on perforated or strip-grid boards are that they are easier to replicate (once designed a circuit can theoretically be produced as often as you like) and that space can be used more efficiently (a board is almost always smaller than a soldered perforated grid board with the same circuit). Ultimately, devices with circuit boards also simply look more professional. There are certainly more advantages (and of course also disadvantages!), but I will not list them here for the sake of simplicity.
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/cover.jpg"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2025-04-14 08:11:20 +0200 CEST"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2025/04/diy-uv-pcb-exposure-unit/>English</a></b></li><li><a href=/de/posts/2025/04/diy-uv-pcb-exposure-unit/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2025/04/diy-uv-pcb-exposure-unit/>English</a></b></li><li><a href=/de/posts/2025/04/diy-uv-pcb-exposure-unit/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/>Self-built UV exposure unit (LED)</a></h1><div class=post-meta><time class=post-date>2025-04-14</time><span class=post-reading-time>11 minutes to read (1122 words)</span></div><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/cover.jpg class=post-cover alt="Self-built UV exposure unit (LED)" title="Cover Image"><div class=table-of-contents><h2>Table of Contents</h2><nav id=TableOfContents><ul><li><a href=#the-housing>The housing</a></li><li><a href=#the-leds>The LEDs</a></li><li><a href=#the-lacquering>The lacquering</a></li><li><a href=#the-control-unit>The control unit</a></li><li><a href=#exposure-time>The practical part - Exposure time</a></li></ul></nav></div><div class=post-content><div><p>If you’ve been around the (electronics) DIY scene for a while, at some point you can’t avoid circuit boards (printed circuit boards/PCBs). The main advantages over soldering circuits by hand on perforated or strip-grid boards are that they are easier to replicate (once designed a circuit can theoretically be produced as often as you like) and that space can be used more efficiently (a board is almost always smaller than a soldered perforated grid board with the same circuit). Ultimately, devices with circuit boards also simply look more professional. There are certainly more advantages (and of course also disadvantages!), but I will not list them here for the sake of simplicity.</p><p>Nowadays, it is very easy to have (self-)created circuit board designs manufactured, with relevant offers from China you pay no more than €5 for a simple circuit board with 2 sides. However, the price does not include the shipping costs and the time you have to wait for your PCBs. If you are not planning to produce several different designs a year, or only need a special circuit board once, you are well served with such offers. However, if you often need custom-made products, it can quickly become lucrative (even with the Chinese offers) to bring the production in-house. At the end of the day, it’s fun and at least gives you the feeling of a little independence to make your own circuit boards!</p><p>So after dreaming of making my own circuit boards for some time, I have now gone one step further in the realization. There are various ways to produce printed circuit boards yourself. The cheapest method is probably exposing a blank PCB with a photopositive coating and then developing and finally etching the exposed areas. Building the etching device myself seemed too tricky, so I decided to buy a used <a href=https://gie-tec.de/produkt/aetzgeraete-fuer-platinen/>Ätzgerät 1 from pro-ma</a>, which was very cheap at €50. But what you can certainly build yourself is the <strong>UV exposure unit</strong>. There are different approaches here, I just want to share mine here (see e.g. <a href=https://www.all4hardware4u.de/platinenherstellung/belichtung/belichtungsgeraet-mit-uv-leds/>here</a> or also <a href=http://www.fdm-ware.de/UV-Led/>here</a> for the modLine truncated
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the LEDs!) and painted it several times according to the instructions on the spray can and left it to dry overnight.</p><figure><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/masked_for_painting.jpg alt="Picture of the box masked for painting"><figcaption><p>Box is masked, about to be painted!</p></figcaption></figure><figure><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/painted_inside.jpg alt="Picture of the inside of the painted box"><figcaption><p>It’s shiny!</p></figcaption></figure><h2 id=the-control-unit>The control unit<a href=#the-control-unit class=hanchor arialabel=Anchor>#</a></h2><p>Here I was faced with a choice: install a simple switch or a more complex logic with a timer function? The idea of the built-in timer seemed appealing - finally programming something hardware-related again. So I assembled a breadboard (perhaps the last one ever?!) with a Raspberry Pi Pico, relays, a connection for an LCD display and some control elements, programmed a small interface with my existing libraries and the electronics were ready! To be installed in the housing, it still needed a cover. All the necessary information can be found in the corresponding <a href=https://git.privacynerd.de/BlueFox/uv-belichter-software>git repository</a>!</p><figure><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/controller-on-dividing-wall.jpg alt="Picture of the control unit"><figcaption><p>The control unit</p></figcaption></figure><figure><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/front-panel.jpg alt="Image of the front panel with the LCD and control elements in operation"><figcaption><p>Front panel with LCD and control elements in operation</p></figcaption></figure><h2 id=exposure-time>The practical part - Exposure time<a href=#exposure-time class=hanchor arialabel=Anchor>#</a></h2><p>So what does it look like in practice - the crucial question at the end. I would like to say that this is my first experience with manual PCB production. I used a simple blinky circuit (which was also my first completely self-made PCB design) for the tests.</p><figure><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/blinky-test-pcb.png alt="Side-by-side view of the printed circuit and the view on the computer with all layers"><figcaption><p>The test object…</p></figcaption></figure><p>So, my first experiences with the self-built exposure unit were mixed. The first attempt with 3 minutes exposure time went somewhat wrong. Specifically, no contours were visible even after 10-20 minutes in the developer at room temperature, and nothing happened even after 20-30 minutes etching. The second attempt was more promising, after 30 minutes of exposure the first contours could be seen after about 15 minutes of development, which actually disappeared during etching. After a few more attempts, I finally came up with the idea of working with two overlapping films instead of one, which meant that much less light came through the printed areas. The results were suddenly improving, and after a short time the circuit board was of sufficient quality for the circuit to function!</p><figure><img src=/en/posts/2025/04/diy-uv-pcb-exposure-unit/first-diy-pcbs.jpg alt="Collage of the first manufacturing attempts up to the first functional PCB"><figcaption><p>…and the results</p></figcaption></figure><p>So: The exposure time for successful results is between 40 and 45 minutes. Admittedly, that’s quite a long time, but it’s sufficient for my first attempts and more than acceptable considering the price of a finished exposure unit (which can easily run into the hundreds) (the exposure unit costs around €30-50 in total - and building it was a lot of fun!). For shorter exposure times, I am considering increasing the number of LEDs afterwards. But that’s a story for another time.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h>Read other posts</span><hr></div><div class=pagination__buttons><a href=https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/ class="button inline prev">< [<span class=button__text>Between Homeschooling And Web Design - nostalgic memories of seventh grade</span>]
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<!doctype html><html lang=en><head><title>How everything began - or: the first post! :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Initial considerations I’ve been thinking about how to write this post for a long time. What needs to be told, what is unimportant? A lot has to be left out for the sake of clarity, and I might not even remember some of it. In any case, I would like to use this article to explain my intention in starting this blog. But to explain that, you have to understand the origins.
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2025/04/how-it-all-began/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/en/posts/2025/04/how-it-all-began/cover.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2025-04-13 15:10:20 +0200 CEST"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2025/04/how-it-all-began/>English</a></b></li><li><a href=/de/posts/2025/04/how-it-all-began/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2025/04/how-it-all-began/>English</a></b></li><li><a href=/de/posts/2025/04/how-it-all-began/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2025/04/how-it-all-began/>How everything began - or: the first post!</a></h1><div class=post-meta><time class=post-date>2025-04-13</time><span class=post-reading-time>11 minutes to read (1097 words)</span></div><img src=/en/posts/2025/04/how-it-all-began/cover.png class=post-cover alt="How everything began - or: the first post!" title="Cover Image"><div class=table-of-contents><h2>Table of Contents</h2><nav id=TableOfContents><ul><li><a href=#thinking>Initial considerations</a></li><li><a href=#beginnings>How it all began</a></li><li><a href=#covid-19>COVID-19</a></li><li><a href=#until-now>Until now…</a></li><li><a href=#planned-content>Planned content</a></li></ul></nav></div><div class=post-content><div><h2 id=thinking>Initial considerations<a href=#thinking class=hanchor arialabel=Anchor>#</a></h2><p>I’ve been thinking about how to write this post for a long time. What needs to be told, what is unimportant? A lot has to be left out for the sake of clarity, and I might not even remember some of it. In any case, I would like to use this article to explain my intention in starting this blog. But to explain that, you have to understand the origins.</p><h2 id=beginnings>How it all began<a href=#beginnings class=hanchor arialabel=Anchor>#</a></h2><p>It all started when I was a 5th or 6th grade student (I can’t remember exactly!) and started writing a batch script on a laptop for school. Yes, that’s how it was, I admit - even if I don’t know who or what drove me to do it. But I have a rough idea: I think it was a child’s intrinsic motivation to find out how this computer in front of him works that made me do it.</p><p>Be that as it may, one of my “programs” looked something like this (yes, partially german):</p><div class=highlight><pre tabindex=0 class=chroma><code class=language-batch data-lang=batch><span class=line><span class=cl><span class=p>@</span><span class=k>echo</span> off
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</span></span><span class=line><span class=cl>
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</span></span><span class=line><span class=cl><span class=k>echo</span> Herzlich Wilkommen , bitte Passwort eingeben
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<!doctype html><html lang=en><head><title>Between Homeschooling And Web Design - nostalgic memories of seventh grade :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Times are changing No one really knows one way or the other - it’s an unprecedented situation. And yet, somehow, we have to deal with it. A virus is spreading, and suddenly the whole world is barricading itself behind its windows and front doors. Clearly, we are talking about the COVID-19 pandemic and the accompanying lockdown(s). Schools in Germany were also closed for a long time during this period, with homeschooling replacing face-to-face teaching. For some, the internet was still new territory (”Neuland”, as some famous female german chancellor once said), while for others, this new reality created unexpected opportunities (including in terms of free time). I was one of the latter - at the time in seventh grade at a Bavarian high school.
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/cover.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2025-11-03 17:55:26 +0100 CET"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2025/11/nostalgic_memories/>English</a></b></li><li><a href=/de/posts/2025/11/nostalgic_memories/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2025/11/nostalgic_memories/>English</a></b></li><li><a href=/de/posts/2025/11/nostalgic_memories/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/>Between Homeschooling And Web Design - nostalgic memories of seventh grade</a></h1><div class=post-meta><time class=post-date>2025-11-03</time><span class=post-reading-time>6 minutes to read (549 words)</span></div><img src=/en/posts/2025/11/nostalgic_memories/cover.png class=post-cover alt="Between Homeschooling And Web Design - nostalgic memories of seventh grade" title="Cover Image"><div class=table-of-contents><h2>Table of Contents</h2><nav id=TableOfContents><ul><li><a href=#times-are-changing>Times are changing</a></li><li><a href=#the-project>The Project</a></li><li><a href=#why-all-this>Why all this?</a></li><li><a href=#the-result>The result</a></li></ul></nav></div><div class=post-content><div><h2 id=times-are-changing>Times are changing<a href=#times-are-changing class=hanchor arialabel=Anchor>#</a></h2><p>No one really knows one way or the other - it’s an unprecedented situation. And yet, somehow, we have to deal with it. A virus is spreading, and suddenly the whole world is barricading itself behind its windows and front doors. Clearly, we are talking about the COVID-19 pandemic and the accompanying lockdown(s). Schools in Germany were also closed for a long time during this period, with homeschooling replacing face-to-face teaching. For some, the internet was still new territory (”Neuland”, as some famous female german chancellor once said), while for others, this new reality created unexpected opportunities (including in terms of free time). I was one of the latter - at the time in seventh grade at a Bavarian high school.</p><h2 id=the-project>The Project<a href=#the-project class=hanchor arialabel=Anchor>#</a></h2><p>In the subject “NuT”, which combines physics and computer science, there was an extensive assignment: after studying graphs and the Internet as a huge network that can be represented as a giant graph, it was time to put theory into practice. The goal: to build a website using HTML (and CSS) in order to better understand how the World Wide Web (WWW) works as a whole - the name was quite telling: “<strong>Project WWW</strong>”.</p><p>“Great! Finally, I get to do something at school that I’m really interested in anyway,” - or something like that - I thought at the time. In any case, I immediately got to work with a classmate (I don’t remember exactly how immediately), we thought about the structure, wrote poems, collected pictures, and looked up definitions. I was mainly responsible for the technical stuff, while he was more responsible for the content and supervision.</p><h2 id=why-all-this>Why all this?<a href=#why-all-this class=hanchor arialabel=Anchor>#</a></h2><p>Anyone who has read this far may be asking themselves this question. Well, first of all, it’s autumn holidays, which means it’s time to take my mind off things for a bit (for example, finally studying a little for a potential amateur radio exam) and reminisce. That’s how I found the project in the depths of my computer’s file system - and Line truncated
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/cover.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2025-11-03 17:55:26 +0100 CET"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2025/11/nostalgic_memories/>English</a></b></li><li><a href=/de/posts/2025/11/nostalgic_memories/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2025/11/nostalgic_memories/>English</a></b></li><li><a href=/de/posts/2025/11/nostalgic_memories/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/>Between Homeschooling And Web Design - nostalgic memories of seventh grade</a></h1><div class=post-meta><time class=post-date>2025-11-03</time><span class=post-reading-time>6 minutes to read (549 words)</span></div><img src=/en/posts/2025/11/nostalgic_memories/cover.png class=post-cover alt="Between Homeschooling And Web Design - nostalgic memories of seventh grade" title="Cover Image"><div class=table-of-contents><h2>Table of Contents</h2><nav id=TableOfContents><ul><li><a href=#times-are-changing>Times are changing</a></li><li><a href=#the-project>The Project</a></li><li><a href=#why-all-this>Why all this?</a></li><li><a href=#the-result>The result</a></li></ul></nav></div><div class=post-content><div><h2 id=times-are-changing>Times are changing<a href=#times-are-changing class=hanchor arialabel=Anchor>#</a></h2><p>No one really knows one way or the other - it’s an unprecedented situation. And yet, somehow, we have to deal with it. A virus is spreading, and suddenly the whole world is barricading itself behind its windows and front doors. Clearly, we are talking about the COVID-19 pandemic and the accompanying lockdown(s). Schools in Germany were also closed for a long time during this period, with homeschooling replacing face-to-face teaching. For some, the internet was still new territory (”Neuland”, as some famous female german chancellor once said), while for others, this new reality created unexpected opportunities (including in terms of free time). I was one of the latter - at the time in seventh grade at a Bavarian high school.</p><h2 id=the-project>The Project<a href=#the-project class=hanchor arialabel=Anchor>#</a></h2><p>In the subject “NuT”, which combines physics and computer science, there was an extensive assignment: after studying graphs and the Internet as a huge network that can be represented as a giant graph, it was time to put theory into practice. The goal: to build a website using HTML (and CSS) in order to better understand how the World Wide Web (WWW) works as a whole - the name was quite telling: “<strong>Project WWW</strong>”.</p><p>“Great! Finally, I get to do something at school that I’m really interested in anyway,” - or something like that - I thought at the time. In any case, I immediately got to work with a classmate (I don’t remember exactly how immediately), we thought about the structure, wrote poems, collected pictures, and looked up definitions. I was mainly responsible for the technical stuff, while he was more responsible for the content and supervision.</p><h2 id=why-all-this>Why all this?<a href=#why-all-this class=hanchor arialabel=Anchor>#</a></h2><p>Anyone who has read this far may be asking themselves this question. Well, first of all, it’s autumn holidays, which means it’s time to take my mind off things for a bit (for example, finally studying a little for a potential amateur radio exam) and reminisce. That’s how I found the project in the depths of my computer’s file system - and Line truncated
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<!doctype html><html lang=en><head><title>Bottle Dryer?! :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="The Idea It’s christmas time. And that means finding something to give as a gift to your closest. And a problem that especially families might know is that when washing many bottles by hand, the dish rack is filled as they consume a lot of space. To tackle this, i imagined a simple bottle dryer to hold the wet bottles. After sorting ideas, I came up with a collapsible design that can adapt to the available space.
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2025/12/bottle-dryer/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/cover.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2025-12-25 12:00:00 +0100 CET"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2025/12/bottle-dryer/>English</a></b></li><li><a href=/de/posts/2025/12/bottle-dryer/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2025/12/bottle-dryer/>English</a></b></li><li><a href=/de/posts/2025/12/bottle-dryer/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2025/12/bottle-dryer/>Bottle Dryer?!</a></h1><div class=post-meta><time class=post-date>2025-12-25</time><span class=post-reading-time>2 minutes to read (188 words)</span></div><img src=https://blog.privacynerd.de/cover.png class=post-cover alt="Bottle Dryer?!" title="Cover Image"><div class=post-content><div><h2 id=introduction>The Idea<a href=#introduction class=hanchor arialabel=Anchor>#</a></h2><p>It’s christmas time. And that means finding something to give as a gift to your closest. And a problem that especially families might know is that when washing many bottles by hand, the dish rack is filled as they consume a lot of space. To tackle this, i imagined a simple bottle dryer to hold the wet bottles. After sorting ideas, I came up with a collapsible design that can adapt to the available space.</p><p><img src=/en/posts/2025/12/bottle-dryer/0-sketch.png alt="A sketch of a design with four legs, two of which are joined in the middle to form an X, and these X-shapes are connected to each other at the ends of the legs—there are rods at each of the six ends to hold the bottles"></p><h2 id=implementation>The Implementation<a href=#implementation class=hanchor arialabel=Anchor>#</a></h2><table><thead><tr><th>Item</th><th>*x</th><th>(Total length)</th></tr></thead><tbody><tr><td>21 cm slats</td><td>4</td><td>84 cm</td></tr><tr><td>25 cm round timber</td><td>6</td><td>150 cm</td></tr><tr><td>Nails / other fasteners for pivot points</td><td>4</td><td>-</td></tr><tr><td>Dowels for connecting slats to round timber</td><td>6</td><td>-</td></tr></tbody></table><p>Not much effort in terms of finances and time has to be put into this. Buy some wooden rods and square timbers, mark them correctly…</p><p><img src=/en/posts/2025/12/bottle-dryer/1-marked.png alt="The square timbers marked for the X-like assembly"></p><p>… and lay them down how they should be positioned in the end:</p><p><img src=/en/posts/2025/12/bottle-dryer/2-arrangement.jpg alt="Everything arranged as it should be assemled later"></p><p>After cutting and milling the parts, a coat of varnish needs to be applied to protect them from water and ensure their longevity. Then everything is assembled - and there you have it: the bottle dryer!</p><p><img src=3-finished.jpg alt="The finished bottle dryer - matte-shiny and collapsible"></p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h>Read other posts</span><hr></div><div class=pagination__buttons><a href=https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/ class="button inline prev">< [<span class=button__text>Verbesserung des UV-Belichters</span>]
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1. PCB Problems The increased number of LEDs also increases the power requirement. And that posed a problem—the first control board was only rated for 1A at 12V. So a new one is needed - the exposure unit exposes its own controller board.
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1. PCB Problems The increased number of LEDs also increases the power requirement. And that posed a problem—the first control board was only rated for 1A at 12V. So a new one is needed - the exposure unit exposes its own controller board.
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"><meta property="og:url" content="https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/cover.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><meta property="article:published_time" content="2026-04-10 18:09:20 +0200 CEST"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/2026/04/exposure-unit-upgrade/>English</a></b></li><li><a href=/de/posts/2026/04/exposure-unit-upgrade/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/2026/04/exposure-unit-upgrade/>English</a></b></li><li><a href=/de/posts/2026/04/exposure-unit-upgrade/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><article class=post><h1 class=post-title><a href=https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/>Verbesserung des UV-Belichters</a></h1><div class=post-meta><time class=post-date>2026-04-10</time><span class=post-reading-time>3 minutes to read (285 words)</span></div><img src=/en/posts/2026/04/exposure-unit-upgrade/cover.png class=post-cover alt="Verbesserung des UV-Belichters" title="Cover Image"><div class=table-of-contents><h2>Table of Contents</h2><nav id=TableOfContents><ul><li><a href=#introduction>Introduction</a></li><li><a href=#problems>1. PCB Problems</a></li><li><a href=#2-fresh-coat>2. Fresh coat</a></li><li><a href=#result>Result</a></li></ul></nav></div><div class=post-content><div><h2 id=introduction>Introduction<a href=#introduction class=hanchor arialabel=Anchor>#</a></h2><p>After a long period of using the <a href=https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/>unit</a> with exposure times exceeding 40 minutes in PCB manufacturing, it was finally time for the previously announced upgrade. The goal was to double the number of LEDs from 48 to 96. This is intended to achieve more uniform coverage of the exposure area, as well as, of course, shorter exposure times.</p><h2 id=problems>1. PCB Problems<a href=#problems class=hanchor arialabel=Anchor>#</a></h2><p>The increased number of LEDs also increases the power requirement. And that posed a problem—the first control board was only rated for 1A at 12V. So a new one is needed - the exposure unit exposes its own controller board.</p><p><img src=/en/posts/2026/04/exposure-unit-upgrade/pcb_arrangement.png alt="The layout"></p><p>Compared to the first version, the advantage of PCBs over breadboards is clear:</p><p><img src=/en/posts/2026/04/exposure-unit-upgrade/pcb_comparison_old_new.jpg alt="The old and new boards compared"></p><h2 id=2-fresh-coat>2. Fresh coat<a href=#2-fresh-coat class=hanchor arialabel=Anchor>#</a></h2><p>To further improve efficiency through reflection, the new circuit board is also sprayed with chrome-effect paint, just like the old one. However, because the smaller distance between the LEDs also requires a different placement of the two LED carrier boards (slightly less distance in the middle to maintain uniformity), the interior of the exposure unit had to be repainted for aesthetic reasons—otherwise, the imprints of the old boards would still be visible.</p><p><img src=/en/posts/2026/04/exposure-unit-upgrade/before-after-spray.png alt="Before-and-after image of the coating on the carrier circuit boards and the interior of the exposure unit"></p><h2 id=result>Result<a href=#result class=hanchor arialabel=Anchor>#</a></h2><p>The result is impressive - you can now barely see any individual light cones at the exposure distance (where the circuit board is placed), resulting in a very uniform image.</p><p><img src=/en/posts/2026/04/exposure-unit-upgrade/before-after_homogenity.jpg alt="Before-and-after image of the illumination: Very uniform on the left, individual light cones still visible on the right"></p><p>In the image, a piece of paper was placed Line truncated
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The new exposure times could not be determined precisely due to time constraints, but they will be in the range of 15–20 minutes.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h>Read other posts</span><hr></div><div class=pagination__buttons><a href=https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/ class="button inline next">[<span class=button__text>Between Homeschooling And Web Design - nostalgic memories of seventh grade</span>] ></a></div></div></article></div><footer class=footer><style>.antidiscovery i{display:none}</style><div class=footer__inner><div class="copyright copyright--user"><span class=antidiscovery>© 2026 <i>L</i>B<i>P</i>e<i>o</i>n<i>i</i>j<i>n</i>a<i>c</i>m<i>G</i>i<i>N</i>n<i>U</i> <i>S</i>B<i>k</i>u<i>o</i>r<i>K</i>k<i>y</i>h<i>f</i>a<i>H</i>r<i>r</i>d<i>y</i>t</span>
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The new exposure times could not be determined precisely due to time constraints, but they will be in the range of 15–20 minutes.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h>Read other posts</span><hr></div><div class=pagination__buttons><a href=https://blog.privacynerd.de/en/posts/2025/12/bottle-dryer/ class="button inline next">[<span class=button__text>Bottle Dryer?!</span>] ></a></div></div></article></div><footer class=footer><style>.antidiscovery i{display:none}</style><div class=footer__inner><div class="copyright copyright--user"><span class=antidiscovery>© 2026 <i>L</i>B<i>P</i>e<i>o</i>n<i>i</i>j<i>n</i>a<i>c</i>m<i>G</i>i<i>N</i>n<i>U</i> <i>S</i>B<i>k</i>u<i>o</i>r<i>K</i>k<i>y</i>h<i>f</i>a<i>H</i>r<i>r</i>d<i>y</i>t</span>
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<!doctype html><html lang=en><head><title>Posts :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=https://blog.privacynerd.de/en/posts/><link rel=stylesheet href=https://blog.privacynerd.de/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css><link rel=stylesheet href=https://blog.privacynerd.de/css/code.min.4f0ccc8439f99bf7f7970298556b94011aabc1fcae743b6842fc3361a2da9ea3.css><link rel=stylesheet href=https://blog.privacynerd.de/css/fonts.min.5bb7ed13e1d00d8ff39ea84af26737007eb5051b157b86fc24487c94f3dc8bbe.css><link rel=stylesheet href=https://blog.privacynerd.de/css/footer.min.eb8dfc2c6a7eafa36cd3ba92d63e69e849e2200e0002a228d137f236b09ecd75.css><link rel=stylesheet href=https://blog.privacynerd.de/css/gist.min.a751e8b0abe1ba8bc53ced52a38b19d8950fe78ca29454ea8c2595cf26aad5c0.css><link rel=stylesheet href=https://blog.privacynerd.de/css/header.min.75c7eb0e2872d95ff48109c6647d0223a38db52e2561dd87966eb5fc7c6bdac6.css><link rel=stylesheet href=https://blog.privacynerd.de/css/main.min.c90e47ca794a3e0d427da049e74434d1a06b439b22f1997b3bd74b740b5e0b5c.css><link rel=stylesheet href=https://blog.privacynerd.de/css/menu.min.3c17467ebeb3d38663dce68f71f519901124fa5cbb4519b2fb0667a21e9aca39.css><link rel=stylesheet href=https://blog.privacynerd.de/css/pagination.min.bbb986dbce00a5ce5aca0504b7925fc1c581992a4bf57f163e5d69cc1db7d836.css><link rel=stylesheet href=https://blog.privacynerd.de/css/post.min.e6dddd258e64c83e05cec0cd49c05216742d42fc8ecbfbe6b67083412b609bd3.css><link rel=stylesheet href=https://blog.privacynerd.de/css/syntax.min.a0773cce9310cb6d8ed23e50f005448facf29a53001b57e038828daa466b25c0.css><link rel=stylesheet href=https://blog.privacynerd.de/css/terminal.min.e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css><link rel=stylesheet href=https://blog.privacynerd.de/css/terms.min.b81791663c3790e738e571cdbf802312390d30e4b1d8dc9d814a5b5454d0ac11.css><link rel=stylesheet href=https://blog.privacynerd.de/terminal.css><link rel="shortcut icon" href=https://blog.privacynerd.de/favicon.png><link rel=apple-touch-icon href=https://blog.privacynerd.de/apple-touch-icon.png><meta name=twitter:card content="summary"><meta name=twitter:site content><meta name=twitter:creator content><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="https://blog.privacynerd.de/en/posts/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/og-image.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><link href=/en/posts/index.xml rel=alternate type=application/rss+xml title="Privacynerd's blog"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/>English</a></b></li><li><a href=/de/posts/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/>English</a></b></li><li><a href=/de/posts/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><div class=posts><article class="post on-list"><h2 class=post-title><a href=https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/>Verbesserung des UV-Belichters</a></h2><div class=post-meta><time class=post-date>2026-04-10</time></div><img src=/en/posts/2026/04/exposure-unit-upgrade/cover.png class=post-cover alt="Verbesserung des UV-Belichters" title="Cover Image"><div class=post-content><h2 id=introduction>Introduction</h2><p>After a long period of using the <a href=https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/>unit</a> with exposure times exceeding 40 minutes in PCB manufacturing, it was finally time for the previously announced upgrade. The goal was to doubLine truncated
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<!doctype html><html lang=en><head><title>Posts :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=https://blog.privacynerd.de/en/posts/><link rel=stylesheet href=https://blog.privacynerd.de/css/buttons.min.86f6b4c106b6c6eb690ae5203d36b442c1f66f718ff4e8164fa86cf6c61ad641.css><link rel=stylesheet href=https://blog.privacynerd.de/css/code.min.d529ea4b2fb8d34328d7d31afc5466d5f7bc2f0bc9abdd98b69385335d7baee4.css><link rel=stylesheet href=https://blog.privacynerd.de/css/fonts.min.5bb7ed13e1d00d8ff39ea84af26737007eb5051b157b86fc24487c94f3dc8bbe.css><link rel=stylesheet href=https://blog.privacynerd.de/css/footer.min.eb8dfc2c6a7eafa36cd3ba92d63e69e849e2200e0002a228d137f236b09ecd75.css><link rel=stylesheet href=https://blog.privacynerd.de/css/gist.min.a751e8b0abe1ba8bc53ced52a38b19d8950fe78ca29454ea8c2595cf26aad5c0.css><link rel=stylesheet href=https://blog.privacynerd.de/css/header.min.75c7eb0e2872d95ff48109c6647d0223a38db52e2561dd87966eb5fc7c6bdac6.css><link rel=stylesheet href=https://blog.privacynerd.de/css/main.min.1d90a993d506516707eea93a3ab2638e4e9f92eb2c6b3aa1a4f08f8f9fa0648e.css><link rel=stylesheet href=https://blog.privacynerd.de/css/menu.min.3c17467ebeb3d38663dce68f71f519901124fa5cbb4519b2fb0667a21e9aca39.css><link rel=stylesheet href=https://blog.privacynerd.de/css/pagination.min.bbb986dbce00a5ce5aca0504b7925fc1c581992a4bf57f163e5d69cc1db7d836.css><link rel=stylesheet href=https://blog.privacynerd.de/css/post.min.e6dddd258e64c83e05cec0cd49c05216742d42fc8ecbfbe6b67083412b609bd3.css><link rel=stylesheet href=https://blog.privacynerd.de/css/syntax.min.a0773cce9310cb6d8ed23e50f005448facf29a53001b57e038828daa466b25c0.css><link rel=stylesheet href=https://blog.privacynerd.de/css/terminal.min.e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css><link rel=stylesheet href=https://blog.privacynerd.de/css/terms.min.b81791663c3790e738e571cdbf802312390d30e4b1d8dc9d814a5b5454d0ac11.css><link rel=stylesheet href=https://blog.privacynerd.de/terminal.css><link rel="shortcut icon" href=https://blog.privacynerd.de/favicon.png><link rel=apple-touch-icon href=https://blog.privacynerd.de/apple-touch-icon.png><meta name=twitter:card content="summary"><meta name=twitter:site content><meta name=twitter:creator content><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="https://blog.privacynerd.de/en/posts/"><meta property="og:site_name" content="Privacynerd's blog"><meta property="og:image" content="https://blog.privacynerd.de/og-image.png"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="627"><link href=/en/posts/index.xml rel=alternate type=application/rss+xml title="Privacynerd's blog"><style>#banner{width:100%;height:2rem;display:grid;grid-template-columns:1fr auto;background:var(--accent)}#banner span{display:flex;align-items:center;justify-content:center}#banner a{color:var(--background);display:inline}#banner>button{padding:0 5px 0 0;margin:0}</style><div id=banner><span><a href=https://git.privacynerd.de/git.privacynerd.de/blog.privacynerd.de>Construction site 🚧 | Work in progress</a></span></div></head><body><div class="container center"><header class=header><div class=header__inner><div class=header__logo><a href=/en><div class=logo>Privacynerd's blog</div></a></div><ul class="menu menu--mobile"><li class=menu__trigger>Menu ▾</li><li><ul class=menu__dropdown><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li><hr><li><b><a href=/en/posts/>English</a></b></li><li><a href=/de/posts/>Deutsch</a></li></ul></li></ul><ul class="menu menu--desktop menu--language-selector"><li class=menu__trigger>en ▾</li><li><ul class=menu__dropdown><li><b><a href=/en/posts/>English</a></b></li><li><a href=/de/posts/>Deutsch</a></li></ul></li></ul></div><nav class=navigation-menu><ul class="navigation-menu__inner menu--desktop"><li><a href=/en/about>About</a></li><li><a href=/en/tags>Tags</a></li></ul></nav></header><div class=content><div class=posts><article class="post on-list"><h2 class=post-title><a href=https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/>Verbesserung des UV-Belichters</a></h2><div class=post-meta><time class=post-date>2026-04-10</time></div><img src=/en/posts/2026/04/exposure-unit-upgrade/cover.png class=post-cover alt="Verbesserung des UV-Belichters" title="Cover Image"><div class=post-content><h2 id=introduction>Introduction</h2><p>After a long period of using the <a href=https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/>unit</a> with exposure times exceeding 40 minutes in PCB manufacturing, it was finally time for the previously announced upgrade. The goal was to doubLine truncated
|
||||
<span style=margin-right:10px>:: <a href="https://privacynerd.de/impressum?referrer=https%3a%2f%2fblog.privacynerd.de%2fen%2fposts%2f">Imprint</a></span>
|
||||
<span>:: <a href=https://github.com/panr/hugo-theme-terminal target=_blank>Theme</a> made by <a href=https://github.com/panr target=_blank>panr</a> (customized)</span></div></div></footer><script type=text/javascript src=/bundle.min.js></script><script src=https://swetrix.privacynerd.de/script.js defer></script><script>document.addEventListener("DOMContentLoaded",function(){swetrix.init("GyBjobBbBEEC",{apiURL:"https://swetrix.privacynerd.de/api/log"}),swetrix.trackViews(),swetrix.trackErrors({sampleRate:1,callback:0[0]})})</script><noscript><img src="https://swetrix.privacynerd.de/api/log/noscript?pid=GyBjobBbBEEC" alt referrerpolicy=no-referrer-when-downgrade></noscript></div></body></html>
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@@ -1,6 +1,7 @@
|
||||
<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on Privacynerd's blog</title><link>https://blog.privacynerd.de/en/posts/</link><description>Recent content in Posts on Privacynerd's blog</description><generator>Hugo</generator><language>en</language><lastBuildDate>Fri, 10 Apr 2026 18:09:20 +0200</lastBuildDate><atom:link href="https://blog.privacynerd.de/en/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>Verbesserung des UV-Belichters</title><link>https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/</link><pubDate>Fri, 10 Apr 2026 18:09:20 +0200</pubDate><guid>https://blog.privacynerd.de/en/posts/2026/04/exposure-unit-upgrade/</guid><description><h2 id="introduction">Introduction</h2>
|
||||
<p>After a long period of using the <a href="https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/">unit</a> with exposure times exceeding 40 minutes in PCB manufacturing, it was finally time for the previously announced upgrade. The goal was to double the number of LEDs from 48 to 96. This is intended to achieve more uniform coverage of the exposure area, as well as, of course, shorter exposure times.</p>
|
||||
<h2 id="problems">1. PCB Problems</h2>
|
||||
<p>The increased number of LEDs also increases the power requirement. And that posed a problem—the first control board was only rated for 1A at 12V. So a new one is needed - the exposure unit exposes its own controller board.</p></description></item><item><title>Between Homeschooling And Web Design - nostalgic memories of seventh grade</title><link>https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/</link><pubDate>Mon, 03 Nov 2025 17:55:26 +0100</pubDate><guid>https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/</guid><description><h2 id="times-are-changing">Times are changing</h2>
|
||||
<p>The increased number of LEDs also increases the power requirement. And that posed a problem—the first control board was only rated for 1A at 12V. So a new one is needed - the exposure unit exposes its own controller board.</p></description></item><item><title>Bottle Dryer?!</title><link>https://blog.privacynerd.de/en/posts/2025/12/bottle-dryer/</link><pubDate>Thu, 25 Dec 2025 12:00:00 +0100</pubDate><guid>https://blog.privacynerd.de/en/posts/2025/12/bottle-dryer/</guid><description><h2 id="introduction">The Idea</h2>
|
||||
<p>It&rsquo;s christmas time. And that means finding something to give as a gift to your closest. And a problem that especially families might know is that when washing many bottles by hand, the dish rack is filled as they consume a lot of space. To tackle this, i imagined a simple bottle dryer to hold the wet bottles. After sorting ideas, I came up with a collapsible design that can adapt to the available space.</p></description></item><item><title>Between Homeschooling And Web Design - nostalgic memories of seventh grade</title><link>https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/</link><pubDate>Mon, 03 Nov 2025 17:55:26 +0100</pubDate><guid>https://blog.privacynerd.de/en/posts/2025/11/nostalgic_memories/</guid><description><h2 id="times-are-changing">Times are changing</h2>
|
||||
<p>No one really knows one way or the other - it&rsquo;s an unprecedented situation. And yet, somehow, we have to deal with it. A virus is spreading, and suddenly the whole world is barricading itself behind its windows and front doors. Clearly, we are talking about the COVID-19 pandemic and the accompanying lockdown(s). Schools in Germany were also closed for a long time during this period, with homeschooling replacing face-to-face teaching. For some, the internet was still new territory (”Neuland”, as some famous female german chancellor once said), while for others, this new reality created unexpected opportunities (including in terms of free time). I was one of the latter - at the time in seventh grade at a Bavarian high school.</p></description></item><item><title>Self-built UV exposure unit (LED)</title><link>https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/</link><pubDate>Mon, 14 Apr 2025 08:11:20 +0200</pubDate><guid>https://blog.privacynerd.de/en/posts/2025/04/diy-uv-pcb-exposure-unit/</guid><description><p>If you&rsquo;ve been around the (electronics) DIY scene for a while, at some point you can&rsquo;t avoid circuit boards (printed circuit boards/PCBs). The main advantages over soldering circuits by hand on perforated or strip-grid boards are that they are easier to replicate (once designed a circuit can theoretically be produced as often as you like) and that space can be used more efficiently (a board is almost always smaller than a soldered perforated grid board with the same circuit). Ultimately, devices with circuit boards also simply look more professional. There are certainly more advantages (and of course also disadvantages!), but I will not list them here for the sake of simplicity.</p></description></item><item><title>How everything began - or: the first post!</title><link>https://blog.privacynerd.de/en/posts/2025/04/how-it-all-began/</link><pubDate>Sun, 13 Apr 2025 15:10:20 +0200</pubDate><guid>https://blog.privacynerd.de/en/posts/2025/04/how-it-all-began/</guid><description><h2 id="thinking">Initial considerations</h2>
|
||||
<p>I&rsquo;ve been thinking about how to write this post for a long time. What needs to be told, what is unimportant? A lot has to be left out for the sake of clarity, and I might not even remember some of it. In any case, I would like to use this article to explain my intention in starting this blog. But to explain that, you have to understand the origins.</p></description></item></channel></rss>
|
||||
Reference in new issue
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