Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
A simple combinator powered ag tower, with speed controls that let you define how quickly you want it harvesting fruits. Change the [S] value in the constant combinator to define the percentage of uptime.
Set the S value to a point where your machines are not starved of fruits, but also so fruits aren't sitting around for too long or need to be burned