Redstone circuits/Miscellaneous/Thyristor - minecraft.fandom.com

G				K
		A

Design A: The dropper has one item, and the hopper is empty.

circuit delay: 3 ticks (G), instant (A on), 1 tick (A off)

Design B: The dropper has one item, and the hopper is empty.

circuit delay: 3 ticks (G), 1 tick (A on), 2 ticks (A off)