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[posts/2026/04/exposure-unit-upgrade] Improved article (added image subtitles and made blur uniform

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2026-04-10 23:32:05 +02:00
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10 changed files with 15 additions and 15 deletions
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content/posts/2026/04/exposure-unit-upgrade/index.en.md
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@@ -14,13 +14,13 @@ After a long period of using the [unit]({{< ref "posts/2025/04/diy-uv-pcb-exposu
## 1. PCB Problems {id=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.
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.
![The layout](pcb_arrangement.png)
Compared to the first version, the advantage of PCBs over breadboards is clear:
![The old and new boards compared](pcb_comparison_old_new.jpg)
{{< figure src="pcb_comparison_old_new.jpg" alt="The new and old controller boards compared; the new one is significantly smaller than the old one" caption="Left: new - right: old" >}}
## 2. Fresh coat
@@ -34,7 +34,7 @@ To further improve efficiency through reflection, the new circuit board is also
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.
![Before-and-after image of the illumination: Very uniform on the left, individual light cones still visible on the right](before-after_homogenity.jpg)
{{< figure src="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" caption="Left: new (48x) LED board; right: old (24x) LED board" >}}
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.
The new exposure times could not be determined precisely due to time constraints, but they will be in the range of 15-20 minutes.