While I prefer to use new parts, for many years I salvaged parts from PCB's without issue. Even today when I am developing something I recover parts as needed if they are not to hand. When you live in the most remote capital city in the world and freight is expensive and slow it makes sense to get something finished instead of waiting.
It occurred to me that I had never seen, or experienced, any reason why recycled components fail. So I thought up a torture test for a device with many transistors, a voltage regulator. After you see what transpired I think it will reassure you about using recycled or salvaged components. The parts survived well beyond what I expected, even shrugging off my efforts to make them fail.
It might not be good enough for NASA but as a hobbyist if it's good enough for me then it's good enough for you.
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