Mechatronics for the Evil Genius: 25 Build-it-Yourself Projects

Circuit bench - 100 shields for arduino

100 Circuits - Audio 1

Fun Projects for the Experimenter - volume 2

4093 IC - Circuit Sourcebook for the Makers

Pirate Radio and Video: Experimental Transmitter Projects

Electronic Projects from the Next Dimension: Paranormal Experiments for Hobbyists