Electronics Text Books Online
 

I came across http://www.ibiblio.org/kuphaldt/electricCircuits/this link on another forum and thought it might be useful here when wiring up control boxes and power supplies. There are 6 books (all for free download in PDF) covering AC, DC, Semiconductors, Digital, Reference and a book with electronic experiments. The books are very comprehensive with some of them 500 pages long!
I hope it helps someone out.

Bob

Great, appreciate you sharing this ! ;)