Space: Lunar Touchdown Circuit

The internet has had many specials in honor of the 40th anniversary of the first man on the moon, but this one is different. This site from NASA shows much of the documentation for the Apollo Lunar Module.

A post from 5Volt.EU has great detail on the Apollo 11's touchdown indicator schematic. This design was the one that told them when the Eagle had landed at Tranquility Base (it also told them when to turn the engines off).

Imagine the huge number of teams necessary to make that mission to the moon possible. Thousands of tiny processes just like this one. They did this all on a computer system that could not even compete with today's cell phones.