At this place you can download a complete NMRA compatible DCC system.
The system includes command station, handheld throttles and boosters with schematics, etch patterns and all information needed to build your own system.
Also other things about railroad modelling are going to be dealt with here.
TMWDCC . A simple 8 throttle, NMRA compatible DCC system, with easy decoder programming capability. (ver 1.34)
TMWDCC2 . A preview on a more advanced DCC system that I am toying with right now. Including DIY Radio Throttles.