QElectroTech is a free software to create electric diagrams. QElectroTech, or QET in short, is currently available in version 0.2.
I've uploaded a .pet here(1144kbytes): qelectrotech-0.22.pet.
It needs QT4 libs, which I've uploaded here(5979kbytes): qt-4.5.3.pet.
Run with Menu>Graphic>QElectrotech