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# Verbesserung des UV-Belichters

2026-04-10 3 minutes to read (319 words)

## Table of Contents

## 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 new controller board.

Compared to the first version, the advantage of PCBs over breadboards is clear:

Left: new - right: old

A double-sided layout made it possible to significantly reduce the amount of space required.

## 2. Fresh coat#

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 footprints of the old boards would still be visible.

## Result#

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.

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.

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