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<!doctype html><html lang=en><head><title>Verbesserung des UV-Belichters :: Privacynerd's blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Introduction After a long period of using the unit 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.
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.
"><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&nbsp;▾</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&nbsp;▾</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 on the glass pane to determine the illumination of the surface. The old circuit board (24 LEDs) was installed on the right, and a new one (48 LEDs) on the left.
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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