Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Update: 13-Jun-2017: Updated to version 0.15 so you don't have to. :)
With either 1, 2, 3 or 4 belts of input, balance this onto between 1 and 8 belts of output.
This is the yellow belt version. The screenshot shows only the blueprints for 1 and 2 belts of input. The blueprint book contains the 3 and 4 input belt versions too.