Soyuz Clock 444H
Flown Soyuz Clock Model 444H
I bought this clock at an auction (RRauction.com). It is authenticated to have been flown in a Soyux TM spacecraft, but unlike the Apollo hardware, there is no way to track a particular item number to a specific flight. There are quite a few versions of this clock. This digital clock replaces an earlier, spectacularly beautiful mechnical version.
Part 1: Discovering the inside
Part 2: Reverse engineering
Part 3: First power up
Part 4: How precise is it?
Part 5: External functions
Part 6: International Atomic Space Clock
You'll find an operating manual from the ISS space station (I believe) and my lab book notes below.
Ken Shirriff's Reverse Engineering of the Clock Innards
Ken Shirriff reverse engineered the clock, and talked about in episode 2.
Ken Shirriff's Soyuz Clock Reverse Engineering Notes
Ken Shirriff Article about the Soyuz Clock
Soundtracks from the episodes
These are the often requested odd Russian folk sound tracks appearing in the episodes.
The original Tetris game soundtrack, as performed by my Mac SE/30 on a subtle background of disk drive rumble:
The Soviet national anthem:
Soyuz 744H Space Clock Reference Pictures and Dimensions
Several viewers have expressed the desire to make a model or a 3D printed version of the clock. Here are a few reference pictures which are close to orthoscopic and should enable you to get the dimensions once you refer to my sketched overall dimensions. If you ever make a 3D model, please contact me so I can post it here!
Viewers' 3D CAD Models
Viewer Gwyllym Suter has made a 3D CAD model of the Soyuz clock from the pictures and dimensions I published above!
You can download it from here:
And so did viewer Balázs Szoke from Hungary, who made this very convincing replica, see picture and his stl files below:
Here are the few doodles I made that show the pinout of the connector
Clock and Quartz Oscillator Precision
In this episode, we use an HP atomic clock to drive the Soyuz clock, and measure the resulting precision of this Soviet-American cooperation.
Here is the diagram of the HP atomic clock external driver for the clock from episode 6
Here is the HP-85 program I used in episode 6 to measure the accuracy of the clock
Fixing the quartz oscillator
We discovered a glitch in our Soviet space clock quartz crystal oscillator. In episode 7, we attempt to fix it.
Here are the reference books on quartz oscillators I use in the episode, and the information about the Soviet IC
Here is the die shot of the Soviet 134LA8 circuit. Die shot is by Ken Shirriff