The picture on this post is the setup for my Digitrax Boosters and command station. From left to right:
1) The power source a Digitrax PS2012 20 Amp Power Supply 12 to 23 VDC.
2) DB200 OPTO 8 Amp DCC OPTO Booster.
3) DCS200 8 Amp DCC Command Station & Booster.
4) The last is a constant 12 VDC power converter. I use this to power all lights and non DCC power to the layout.