When people mention Akihabara, the first thing everyone would think of are either maid cafe or otaku related stuff but Akihabara has more things to offer. Like electronic, hardware, and other naughty stuff :P I usually go there look for electronic DIY kits to make at home or do some repairing around the house.
If you don't know how to do it, there are many repair shop. Next time, if there is something you need to fix you can bring it there.
Photo by KevinC
Photo by IQRemix