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My UV exposure frame for making PCB's did not have a timer, so I built a little one and included it in the housing. It simply turns off the light after a certain time.
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I used some old mechanical encoders to set the time. It seemed the most practical because you can see the settings without energy being applied (e.g. a 7-Seg display).
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The circiut was then built into the frame with a status LED.
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