Should I cite sources about a technology description?
If something can be deemed common knowledge in your field there should be no need to cite it. 

MIT define common knowledge as;


  Broadly speaking, common knowledge refers to information that the average, educated reader would accept as reliable without having to look it up. 


There is further detail on that link about Common Knowledge and it's applications. They also say that there best advice is: 'When in doubt, cite your source.'

That said if you are taking something verbatim from a source you should cite it.

Just on your sources; in academia you tend to shy away from citing from wikipedia etc. You can see a discussion on that issue at this question