Build your own Smartphone
Building your own Smartphone? That could be a great hobby project. One way to do it could be to use a Raspberry Pi and use the Sailfish OS. In this video, Aleksi Suomalainen shows you what he has done.
Electronics
Moog Synth: This could be a great hobby project.
Building parts of a Moog synth as a hobby project would be very interesting. Now it is possible to do so using the original hand-made drawings.