Earl Boysen is a veteran engineer who maintains two technology-focused Web sites, www.buildinggadgets.com and www.understandingnano.com. He is coauthor of Electronics For Dummies, Electronics Projects For Dummies, and Nanotechnology For Dummies, all published by Wiley. Visit his sites at: www.buildinggadgets.com and  www.understandingnano.com

The late Harry Kybett wrote the bestselling first and second editions of Electronics Self-Teaching Guide. He was director of engineering operations at Columbia Pictures Corporation. He built many studios and video systems for the broadcasting industry and created training programs for Sony Corporation of America.