Nonstackable Separators

Many contraptions require that nonstackable items be split from the stackables, such as as universal storage inputs and farm storages. 

Most nonstackable separators use the property of nonstackables that a comparator sees a slot with a nonstackable to be the same as a stack (64) of stackables.

Due to this, a single nonstackable item inside a dropper will cause a comparator reading it to output a signal strength of 2. Similarly, a hopper with a single nonstackable item will cause a comparator reading it to output a signal strength of 3. 

A nonstackable separator using signal strength and droppers. The diamond represents any 64 or 16 stackable.