A lot of people are using pixels these days, so I designed a small PCB (38mm x 51mm) so they could add 3 channels of DC control and drive it from their pixel controller.
This board accepts pixel data in the WS2801 format, so for example could be added to a mega tree to add a star topper made from “dumb” DC strip or other lights.
The maximum current capacity is 5 Amps between the 3 channels which should be more than enough. It can draw power from the 4 pin pixel I/O connectors or a dedicated DC input.
You can continue the pixel signal onto more pixels (or another one of these boards) using the other 4 pin connector.
I have provided a jumper to separate the pixel V+ from the DC output V+. This means you can use these boards on 5V pixel systems and still have 12V DC outputs with no issues. You will need to provide a 12V power source of course.
The LPD6803 version is almost identical.