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you could try something like this http://www.rapidonline.com/Cables-Connectors/TruConnect-PCB-Jack-Socket-Stereo-3-5mm-20-0137?sourceRefKey=YyKBeYhU0&filterSearchScope=1 or you could just find an old pair of headphones and cut the wire off that. You should find 3 wires inside, one red, one green and one black. Red and green are right and left (not sure which way round) and black is common.
Look like normal disc capacitors to me. Any that look similar to these would be fine http://www.rapidonline.com/electronic-components/suntan-ts15001h102ksbpa0r-1nf-10-50v-y5p-2-5mm-ceramic-disc-capacitor-08-0200.
no, supply voltage range is 6 to 32v
Pan / Tilt face tracking with the raspberry pi