Technobijoux is a second life of electronic components.
Electronic is with us for over one hundred years. We produce a lot of electronic components, from vacuum tubes, through miniature passive elements and transistors, to large scale integrated circuits. All these things are beautiful and I feel sorrow it they finally finish as a rubbish.
However you have to be careful. Vacuum tubes can implode and hurt somebody. Unknown integrated circuits can contain cadmium, mercury or nickel. Sometimes they can contain polybrominated diphenyl ethers, especially these older. Check carefully what you use!