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I built a little constant-current power supply for a laser that I removed from a DVD drive. It is based on an LM317 voltage regulator chip, a resistor and two capacitors. Please subscribe, and consider becoming a Member of my channel! https://www.youtube.com/channel/UCKp1MzuAceJnDqAvsZl_46g/join Parts and tools: https://curiousscientist.tech/tools
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