Everyone has junk sitting around. But you can turn those cathode-ray television sets, obsolete camcorders, and dusty rotary phones into brand-new projects. The first step is to take everything apart.

In the latest episode of the Rebuild video series, Popular Science columnist Chris Hackett demonstrates how to harvest electronics from old pieces of technology–and in the process, teach yourself how they work. Of course, some students are more advanced than others. “I can take a TV, and I can build a stun gun,” Hackett says. Other people might want to use their new bounty for a simpler build, like a radio receiver.

Learn more tips and tactics from Hackett in his new book, Maker Skills.