This video, titled ‘Minecraft 1.4.7 Redstone Logic Part I: Gates’, was uploaded by emf4kv on 2013-01-19 03:34:40. It has garnered 615 views and 6 likes. The duration of the video is 00:08:21 or 501 seconds.
Logic Gates allow you to operate doors, traps, or any piston driven creation from pressure plate, button, or lever inputs. These work in multiplayer and single player. They are built spread out so you can see how they operate, but you can make them any shape as long as the redstone paths are done correctly. Not gates are also known as Inverters. Here are a few time cues: NOT 00:07 AND 01:03 OR 02:36 NAND 04:12 NOR 04:58 XOR 05:47 XNOR 07:05
Take a look here for a tutorial on comparators in snapshot 13w04a: http://youtu.be/oNqhPAu0fgA