This video, titled ‘Minecraft: 1.5.x Tiny toggleable redstone clocks (round-up)’, was uploaded by suit1337 on 2012-01-05 22:14:29. It has garnered 23071 views and 224 likes. The duration of the video is 00:02:18 or 138 seconds.
Tutorial for building 5 different types of very compact toggleable redstone clocks. All shown clocks are limited to 3 ticks (the torch will burn out on one or two tick setting). The 2nd clock can be extended to more than 4 ticks by adding additional repeaters (as shown in the video). Since the 4th and 5th design are variations of the 2nd design, they also could be extended to more than 4 ticks.
Credits: #1 ZirumsHeroTWR in this video: http://www.youtube.com/watch?v=56RKj80B1Vg
#2 can’t remember right now 🙁
#3 ilForno / HomemadeMinecraft in this video: http://www.youtube.com/watch?v=XbCe7br-fNk
#4 & 5 are “original” and pretty similar to design #2
(The video was initially shot with Minecraft 1.0.0 but the clocks work flawlessly with 1.5.x)