User:L4bbogdanbarbu/Automatic dropper/dispenser

The following is a very simple circuit I often use to automatically empty droppers and dispensers. Its advantages are high fire rate and compactness and its disadvantage is that the dropper or dispenser will need to hold a few items before it starts firing. It's particularly useful in automatic farms because the residual quantity that gets stuck doesn't represent much at all in the long run.

Construction
You will need to allocate an area of 2 &times; 4.

The unknown block represents either a dropper or a dispenser.

Fire Rate
Putting the comparator in substraction mode will cause the signal to oscilate once per redstone tick. That means that the maximum fire rate is once every two game ticks.